CN108931084B

CN108931084B - Anti-freezing control device of heat pump unit, heat pump unit and anti-freezing control method of heat pump unit

Info

Publication number: CN108931084B
Application number: CN201810725516.0A
Authority: CN
Inventors: 周宏宇; 张勇; 杨文军; 邓志扬; 熊月忠; 周亚; 董昊; 黎珍
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2018-07-04
Filing date: 2018-07-04
Publication date: 2019-10-18
Anticipated expiration: 2038-07-04
Also published as: CN108931084A

Abstract

The invention discloses an anti-freezing control device of a heat pump unit, the heat pump unit and an anti-freezing control method thereof, wherein the device comprises: a water outlet pipe of the heat pump unit is divided into two paths after passing through a bypass main pipe, the first path is communicated to a direct-heating water inlet pipe of the heat pump unit through a direct-heating bypass branch pipe, and the second path is communicated to a circulating water inlet pipe of the heat pump unit through a circulating bypass branch pipe; the first anti-freezing electromagnetic valve is arranged on the direct-heating bypass branch pipe and used for controlling a part of hot water in the water outlet pipe to flow into the direct-heating water inlet pipe through the direct-heating bypass branch pipe so as to realize anti-freezing control on the direct-heating water inlet pipe; and the second anti-freezing electromagnetic valve is arranged on the circulating bypass branch pipe and used for controlling a part of hot water in the water outlet pipe to flow into the circulating water inlet pipe through the circulating bypass branch pipe so as to realize anti-freezing control on the circulating water inlet pipe. The scheme of the invention can solve the problem of poor anti-freezing effect in the anti-freezing treatment of the pipeline by adopting the pipeline tracing band laying mode in the prior art, and achieves the effect of improving the anti-freezing effect.

Description

Anti-freezing control device of heat pump unit, heat pump unit and anti-freezing control method of heat pump unit

Technical Field

The invention belongs to the technical field of heat pumps, and particularly relates to an anti-freezing control device of a heat pump unit, the heat pump unit and an anti-freezing control method thereof, in particular to a control device for automatically preventing water inlet pipes of a direct-heat circulation type heat pump unit from freezing, the heat pump unit with the control device and the anti-freezing control method of the heat pump unit.

Background

With the rise of coal-to-electricity conversion in the north, the heat pump water heater gradually becomes a favorite in the market, the application range is gradually expanded, and the anti-freezing of the unit is always a pain point of the heat pump unit, including the anti-freezing of a water side heat exchanger, the anti-freezing of a pipeline valve, the anti-freezing of a drain pipe and the like. The commercial direct-heating circulating type water heater has the advantage of quickly preparing hot water, tap water enters the unit and can reach the water temperature required by a user through one-time heating, the comfort and the convenience are higher, but the temperature of the tap water in winter is lower, particularly in the north, the water standing in an outdoor pipeline is easy to freeze, and therefore the problem of preventing freezing of an outdoor unit water inlet pipeline is solved.

At present, the direct heat cycle units in the market basically adopt a mode of laying pipeline tracing bands to carry out anti-freezing treatment on the pipelines. For example: referring to the example shown in fig. 1, the pipeline heat tracing band can be attached to the water inlet pipe for wiring, the outer layer is wrapped with tinfoil, and the periphery of the tinfoil is wrapped with a layer of heat insulation cotton. However, this method is not effective, the heat tracing band has a poor fit to the valve member, and the extremely low ambient temperature increases the risk of freezing the pipes and valve members.

Disclosure of Invention

The invention aims to provide an anti-freezing control device of a heat pump unit, the heat pump unit and an anti-freezing control method thereof, aiming at solving the problem of poor anti-freezing effect in the process of carrying out anti-freezing treatment on a pipeline by adopting a pipeline tracing band laying mode in the prior art and achieving the effect of improving the anti-freezing effect.

The invention provides an anti-freezing control device of a heat pump unit, which comprises: the bypass main pipe, the direct-heating bypass branch pipe, the circulating bypass branch pipe, the first anti-freezing electromagnetic valve and the second anti-freezing electromagnetic valve are arranged in the circulating bypass branch pipe; the water outlet pipe of the heat pump unit is divided into two paths after passing through the bypass main pipe, the first path is communicated to the direct-heating water inlet pipe of the heat pump unit through the direct-heating bypass branch pipe, and the second path is communicated to the circulating water inlet pipe of the heat pump unit through the circulating bypass branch pipe; the first anti-freezing electromagnetic valve is arranged on the direct-heating bypass branch pipe and used for controlling a part of hot water in the water outlet pipe to flow into the direct-heating water inlet pipe through the direct-heating bypass branch pipe so as to realize anti-freezing control on the direct-heating water inlet pipe; the second anti-freezing electromagnetic valve is arranged on the circulating bypass branch pipe and used for controlling a part of hot water in the water outlet pipe to flow into the circulating water inlet pipe through the circulating bypass branch pipe so as to realize anti-freezing control on the circulating water inlet pipe.

Optionally, the method further comprises: a booster pump; the booster pump is arranged on the bypass main pipe and used for controlling the water pressure when a part of hot water in the water outlet pipe flows into the direct-heating water inlet pipe or the circulating water inlet pipe through the circulating bypass branch pipe.

Optionally, the method further comprises: a one-way valve; the one-way valve is arranged on the bypass main pipe and used for preventing water in the direct-heating water inlet pipe or the circulating water inlet pipe from flowing back into the water outlet pipe; when the anti-freezing control device of the heat pump unit further comprises a booster pump, the booster pump is arranged at the inlet of the bypass main pipe, and the check valve is arranged at the outlet of the bypass main pipe.

Optionally, the method further comprises: a temperature sensing module and a controller; the temperature sensing module is used for acquiring at least one of the direct hot inlet water temperature at the inlet of the direct hot inlet water pipe, the circulating inlet water temperature at the inlet of the circulating inlet water pipe and the environmental temperature of the environment where the heat pump unit is located; the controller is used for determining whether the environment temperature is less than a preset anti-freezing opening ring temperature; if the environment temperature is lower than the anti-freezing opening ring temperature, further determining whether the heat pump unit operates in a circulating water heating mode or a direct water heating mode; if the heat pump unit is currently operated in the circulating hot water heating mode, controlling a part of hot water in the water outlet pipe to flow into the direct-heating water inlet pipe through the direct-heating bypass branch pipe by the first anti-freezing electromagnetic valve; and if the heat pump unit is currently operated in the direct heating water heating mode, controlling a part of hot water in the water outlet pipe to flow into the circulating water inlet pipe through the circulating bypass branch pipe by the second anti-freezing electromagnetic valve.

Optionally, wherein the controller controls, by the first anti-freezing electromagnetic valve, a portion of the hot water in the water outlet pipe to flow into the direct-heating water inlet pipe through the direct-heating bypass branch pipe, and includes: determining whether the direct hot inlet water temperature is less than a preset anti-freezing opening water temperature; if the direct-heating inlet water temperature is lower than the anti-freezing opening water temperature, the first anti-freezing electromagnetic valve is switched on, so that a part of hot water in the water outlet pipe flows into the direct-heating inlet water pipe through the direct-heating bypass branch pipe; or, the controller controls a part of hot water in the water outlet pipe to flow into the circulating water inlet pipe through the circulating bypass branch pipe through the second anti-freezing electromagnetic valve, and the controller comprises: determining whether the circulating inlet water temperature is less than a preset anti-freezing opening water temperature; and if the circulating inlet water temperature is lower than the anti-freezing opening water temperature, the second anti-freezing electromagnetic valve is switched on, so that a part of hot water in the water outlet pipe flows into the circulating inlet pipe through the circulating bypass branch pipe.

Optionally, wherein the controller controls, by the first anti-freezing electromagnetic valve, a portion of the hot water in the water outlet pipe to flow into the direct-heating water inlet pipe through the direct-heating bypass branch pipe, and further includes: after a part of hot water in the water outlet pipe flows into the direct-heating water inlet pipe through the direct-heating bypass branch pipe, determining whether the direct-heating inlet water temperature is greater than a preset anti-freezing outlet water temperature within a first preset time period; if the direct hot inlet water temperature is higher than the anti-freezing outlet water temperature within the first preset time, the first anti-freezing electromagnetic valve is turned off to stop enabling a part of hot water in the water outlet pipe to flow into the direct hot inlet water pipe through the direct hot bypass branch pipe; or, the controller controls a part of hot water in the water outlet pipe to flow into the circulating water inlet pipe through the circulating bypass branch pipe through the second anti-freezing electromagnetic valve, and the controller further comprises: after a part of hot water in the water outlet pipe flows into the circulating water inlet pipe through the circulating bypass branch pipe, determining whether the circulating inlet water temperature is greater than a preset anti-freezing outlet water temperature within a second preset time period; and if the circulating inlet water temperature is higher than the anti-freezing outlet water temperature within the second preset time, the second anti-freezing electromagnetic valve is turned off to stop enabling part of hot water in the water outlet pipe to flow into the circulating inlet water pipe through the circulating bypass branch pipe.

Optionally, when the antifreeze control apparatus of the heat pump unit further includes a booster pump, the controller is further configured to control, by the first antifreeze solenoid valve, a portion of hot water in the water outlet pipe flows into the direct-heat water inlet pipe through the direct-heat bypass branch pipe, or control, by the second antifreeze solenoid valve, a portion of hot water in the water outlet pipe flows into the circulation water inlet pipe through the circulation bypass branch pipe, and further includes: if the direct-heating water inlet temperature is lower than the anti-freezing starting water temperature or the circulating water inlet temperature is lower than the anti-freezing starting water temperature, enabling the booster pump to be started; and/or if the direct-heating water inlet temperature is greater than the anti-freezing exit water temperature in the first preset time period or the circulating water inlet temperature is greater than the anti-freezing exit water temperature in the second preset time period, the booster pump is closed.

Optionally, the temperature sensing module includes: at least one of a direct-heating water inlet pipe thermal bulb, a circulating water inlet thermal bulb and an environment thermal bulb; the direct-heating water inlet pipe thermometer bulb is used for acquiring the direct-heating water inlet temperature at the inlet of the direct-heating water inlet pipe; the circulating water inlet temperature sensing bulb is used for acquiring the circulating water inlet temperature at the inlet of the circulating water inlet pipe; the environment temperature sensing bag is used for acquiring the environment temperature of the environment where the heat pump unit is located.

In another aspect, the present invention provides a heat pump unit, including: the anti-freezing control device of the heat pump unit is provided.

Matching with the heat pump unit, the invention provides an anti-freezing control method of the heat pump unit, which comprises the following steps: controlling a part of hot water in the water outlet pipe to flow into the direct-heating water inlet pipe through the direct-heating bypass branch pipe through a first anti-freezing electromagnetic valve so as to realize anti-freezing control on the direct-heating water inlet pipe; and controlling a part of hot water in the water outlet pipe to flow into the circulating water inlet pipe through the circulating bypass branch pipe through a second anti-freezing electromagnetic valve so as to realize anti-freezing control on the circulating water inlet pipe.

Optionally, the method further comprises: controlling the water pressure when a part of hot water in the water outlet pipe flows into the direct-heating water inlet pipe or the circulating water inlet pipe through the circulating bypass branch pipe; and/or preventing the water in the direct-heating water inlet pipe or the circulating water inlet pipe from flowing back into the water outlet pipe.

Optionally, the method further comprises: acquiring at least one of the direct-heating inlet water temperature at the inlet of the direct-heating water inlet pipe, the circulating inlet water temperature at the inlet of the circulating water inlet pipe and the environmental temperature of the environment where the heat pump unit is located; determining whether the environment temperature is less than a preset anti-freezing opening ring temperature; if the environment temperature is lower than the anti-freezing opening ring temperature, further determining whether the heat pump unit operates in a circulating water heating mode or a direct water heating mode; if the heat pump unit is currently operated in the circulating hot water heating mode, controlling a part of hot water in the water outlet pipe to flow into the direct-heating water inlet pipe through the direct-heating bypass branch pipe by the first anti-freezing electromagnetic valve; and if the heat pump unit is currently operated in the direct heating water heating mode, controlling a part of hot water in the water outlet pipe to flow into the circulating water inlet pipe through the circulating bypass branch pipe by the second anti-freezing electromagnetic valve.

Optionally, wherein the first anti-freezing electromagnetic valve controls a part of hot water in the water outlet pipe to flow into the direct-heating water inlet pipe through the direct-heating bypass branch pipe, further comprising: after a part of hot water in the water outlet pipe flows into the direct-heating water inlet pipe through the direct-heating bypass branch pipe, determining whether the direct-heating inlet water temperature is greater than a preset anti-freezing outlet water temperature within a first preset time period; if the direct hot inlet water temperature is higher than the anti-freezing outlet water temperature within the first preset time, the first anti-freezing electromagnetic valve is turned off to stop enabling a part of hot water in the water outlet pipe to flow into the direct hot inlet water pipe through the direct hot bypass branch pipe; or, the second anti-freezing electromagnetic valve controls a part of hot water in the water outlet pipe to flow into the circulating water inlet pipe through the circulating bypass branch pipe, and the system further comprises: after a part of hot water in the water outlet pipe flows into the circulating water inlet pipe through the circulating bypass branch pipe, determining whether the circulating inlet water temperature is greater than a preset anti-freezing outlet water temperature within a second preset time period; and if the circulating inlet water temperature is higher than the anti-freezing outlet water temperature within the second preset time, the second anti-freezing electromagnetic valve is turned off to stop enabling part of hot water in the water outlet pipe to flow into the circulating inlet water pipe through the circulating bypass branch pipe.

Optionally, when the heat pump unit further includes a booster pump, the first anti-freezing solenoid valve controls a part of hot water in the water outlet pipe to flow into the direct-heating water inlet pipe through the direct-heating bypass branch pipe, or the second anti-freezing solenoid valve controls a part of hot water in the water outlet pipe to flow into the circulation water inlet pipe through the circulation bypass branch pipe, further including: if the direct-heating water inlet temperature is lower than the anti-freezing starting water temperature or the circulating water inlet temperature is lower than the anti-freezing starting water temperature, enabling the booster pump to be started; and/or if the direct-heating water inlet temperature is greater than the anti-freezing exit water temperature in the first preset time period or the circulating water inlet temperature is greater than the anti-freezing exit water temperature in the second preset time period, the booster pump is closed.

According to the scheme, a bypass pipe is additionally arranged at a water outlet pipe orifice of the unit and is respectively connected to a direct-heating water inlet pipe and a circulating water inlet pipe orifice of the unit, a pressure water pump is additionally arranged on a bypass main pipe, a first anti-freezing electromagnetic water valve and a second anti-freezing electromagnetic water valve are respectively and correspondingly arranged on a direct-heating bypass branch pipe and a circulating bypass branch pipe, so that hot water and low-temperature water generated by the unit are mixed in a bypass mode, a main board controls the pressure water pump to be started and stopped and the anti-freezing electromagnetic valve to be switched on and off according to the environment temperature and the water temperature, and.

Furthermore, according to the scheme of the invention, the one-way valve is additionally arranged on the bypass main pipe, so that cold water can be prevented from directly entering the water tank through the bypass pipe, and the comfort of water use of a user is ensured.

Furthermore, according to the scheme of the invention, the hot water and the low-temperature water generated by the unit are mixed, so that the real-time detection of the ambient temperature and the water inlet temperature can be realized, the risk of freezing the pipeline and the valve piece is comprehensively evaluated through the ambient temperature and the water inlet temperature, the water inlet pipe of the unit is prevented from being frozen while energy is saved, and the anti-freezing efficiency and the reliability are higher compared with those of the heat tracing band.

Therefore, according to the scheme provided by the invention, hot water and low-temperature water generated by the unit are mixed in a bypass mode, the water inlet pipe is prevented from being frozen due to the fact that the low-temperature water is kept still in winter, the problem that the pipeline is poor in anti-freezing effect in the process of anti-freezing treatment in the prior art by adopting a pipeline tracing band laying mode is solved, and therefore the defects of poor anti-freezing effect, high maintenance difficulty and poor user experience in the prior art are overcome, and the beneficial effects of good anti-freezing effect, low maintenance difficulty and good user experience are achieved.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

FIG. 1 is a schematic diagram of an anti-freezing structure of a heat tracing band of a heat pump unit;

FIG. 2 is a schematic structural view of an embodiment of an anti-freezing control device of a heat pump unit according to the present invention (i.e., a schematic structural view of automatic hot water anti-freezing);

FIG. 3 is a schematic flow chart of a hot water automatic anti-freezing control method according to an embodiment of the heat pump unit of the present invention;

FIG. 4 is a schematic flow chart illustrating an anti-freeze control method for a heat pump unit according to an embodiment of the present invention;

FIG. 5 is a schematic flow chart illustrating an embodiment of an inlet control of controlling a portion of hot water in the water outlet pipe to flow into the straight hot water inlet pipe through the straight hot bypass branch pipe by the first anti-freezing solenoid valve in the method of the present invention;

FIG. 6 is a schematic flow chart illustrating an embodiment of an inlet control for controlling a portion of the hot water in the water outlet pipe to flow into the circulation inlet pipe through the circulation bypass branch pipe by the second anti-freezing solenoid valve in the method of the present invention;

FIG. 7 is a schematic flow chart illustrating an embodiment of an exit control of controlling a portion of hot water in the water outlet pipe to flow into the straight hot water inlet pipe through the straight hot bypass branch pipe by the first anti-freezing solenoid valve in the method of the present invention;

fig. 8 is a schematic flow chart of an embodiment of the method of the invention, wherein the second anti-freezing solenoid valve controls the exit control of a part of hot water in the water outlet pipe flowing into the circulating water inlet pipe through the circulating bypass branch pipe.

With reference to fig. 1, the reference numerals in the embodiment of the present invention are as follows:

11-a water outlet temperature sensing bulb; 12-a water side heat exchanger; 13-a warm water valve; 14-an electromagnetic water valve; 15-water pressure switch; 16-heat tracing band; 17-a check valve; 18-water inlet temperature sensing bulb.

With reference to fig. 2, the reference numerals in the embodiment of the present invention are as follows:

1-a bypass main pipe; 2-direct heat bypass branch pipe; 3-circulating the bypass branch pipe; 21-water outlet temperature sensing bag; 22-water side heat exchanger; 23-a warm water valve; 24-an electromagnetic water valve; 25-water pressure switch; 26-a check valve; 27-a water inlet temperature sensing bulb; 31-a booster water pump; 32-a one-way valve; 33-a first anti-freeze solenoid valve (e.g. a first anti-freeze solenoid water valve); 34-a second anti-freezing electromagnetic valve (such as a second anti-freezing electromagnetic water valve); 35-direct heating water inlet temperature sensing bag; 36-circulating water inlet temperature sensing bulb.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

According to an embodiment of the present invention, a method for controlling freeze protection of a heat pump unit is provided, as shown in fig. 2, which is a schematic structural diagram of an embodiment of the apparatus of the present invention. The anti-freezing control device of the heat pump unit can comprise: a bypass manifold 1, a direct-heating bypass branch pipe 2, a circulation bypass branch pipe 3, a first anti-freezing electromagnetic valve 33 and a second anti-freezing electromagnetic valve 34.

In an optional example, the water outlet pipe of the heat pump unit is divided into two paths after passing through the bypass main pipe 1, the first path is communicated to the direct-heat water inlet pipe of the heat pump unit through the direct-heat bypass branch pipe 2, and the second path is communicated to the circulation water inlet pipe of the heat pump unit through the circulation bypass branch pipe 3.

Specifically, an inlet of the bypass main pipe 1 is communicated with an outlet of a water outlet pipe of the heat pump unit. The outlet of the bypass main pipe 1 is respectively communicated to the inlet of the direct-heating bypass branch pipe 2 and the inlet of the circulating bypass branch pipe 3. And the outlet of the direct-heat bypass branch pipe 2 is communicated to the inlet of a direct-heat water inlet pipe of the heat pump unit. And the outlet of the circulation bypass branch pipe 3 is communicated to the inlet of a circulation water inlet pipe of the heat pump unit. The outlet of the direct-heating water inlet pipe is communicated with the outlet of the circulating water inlet pipe and communicated to the water inlet end of the water-side heat exchanger 22.

In an alternative example, the first anti-freezing solenoid valve 33, disposed on the direct heat bypass branch pipe 2, may be used to control a portion of the hot water in the water outlet pipe to flow into the direct heat inlet pipe through the direct heat bypass branch pipe 2, so as to achieve anti-freezing control on the direct heat inlet pipe.

For example: first solenoid valve 33 prevents frostbite can be used for control heat pump set's outlet pipe with the switch-on or the turn-off in the straight hot water route between heat pump set's the straight hot inlet tube the ambient temperature of heat pump set place the environment be less than predetermined prevent frostbite open the temperature heat pump set is operated in the circulation and is heated the water mode, just the straight hot temperature of intaking of straight hot inlet tube entrance is less than predetermined prevent frostbite open under the condition of temperature, makes partly hot water warp in the outlet pipe 2 flows in the straight hot bypass branch pipe straight hot inlet tube prevents that straight hot inlet tube is frozen.

In an optional example, the second anti-freezing solenoid valve 34, disposed on the circulation bypass branch pipe 3, may be used to control a portion of the hot water in the water outlet pipe to flow into the circulation inlet pipe through the circulation bypass branch pipe 3, so as to achieve anti-freezing control on the circulation inlet pipe.

For example: the frostproofing solenoid valve 34 of second can be used for control heat pump set's outlet pipe with the switch-on or the turn-off in circulation water route between heat pump set's the circulation inlet tube the ambient temperature of heat pump set place environment is less than predetermined prevent frostbite and opens the temperature heat pump set operation in the direct heating hot water mode, just circulation inlet tube entrance's circulation is intake the temperature and is less than predetermined prevent frostbite and open under the condition of temperature, makes partly hot water warp in the outlet pipe circulation bypass branch pipe 3 flows in the circulation inlet tube, in case the circulation inlet tube is frozen.

For example: the hot water and the low-temperature water that produce the unit self are mixed through the mode of bypass, prevent that winter low temperature water from stewing and leading to the inlet tube to be frozen. The main board controls the booster water pump to be started and stopped and the anti-freezing electromagnetic valve to be switched on and off according to the environment temperature and the water temperature, and energy conservation is achieved while freezing is prevented.

According to the scheme of the invention, the circulating inlet water bypass is not controlled to enter the direct-heating inlet pipe, and the direct-heating inlet pipe is prevented from freezing by utilizing the flow of water; the water in the air-conditioning water pipe is kept flowing through the automatic water replenishing through the water pressure instead of the automatic water draining through the water temperature control water valve, so that the anti-freezing of the air-conditioning water pipe is realized.

From this, set up the bypass house steward through the delivery port at heat pump set, and set up and lead to the straight hot bypass branch road of straight hot inlet tube through the bypass house steward, and lead to the circulation bypass branch road of circulation inlet tube through the bypass house steward, and then prevent frostbite through the straight hot inlet tube of the first solenoid valve control that prevents frostbite on the straight hot bypass branch road, and prevent frostbite through the second solenoid valve control circulation inlet tube that prevents frostbite on the circulation bypass branch road, thereby realize the autonomic of heat pump set inlet tube and prevent frostbite, prevent frostbite effectually, the.

In an alternative embodiment, the method may further include: a booster pump 31.

In an alternative example, the booster pump 31, which is disposed on the bypass manifold 1, may be used to control the water pressure when a portion of the hot water in the water outlet pipe flows into the direct-heating water inlet pipe or the circulating water inlet pipe through the circulating bypass branch pipe 3.

For example: the booster pump is to increase the water pressure of the bypass passage (e.g., the circulation bypass branch pipe 3). Because when the water pressure of the outlet water is less than the water pressure of the inlet water, the outlet water cannot be introduced into the inlet pipe without the booster pump.

From this, through setting up the water pressure that some hot water flowed into directly hot inlet tube or circulation inlet tube in the booster pump control outlet pipe on the side-by-side main pipe to can control the efficiency of preventing frostbite in a flexible way, make the autonomic of inlet tube prevent frostbite more controllable, more convenient.

In an alternative embodiment, the method may further include: a one-way valve 32.

In an alternative example, the check valve 32, which is disposed on the bypass manifold 1, can be used to prevent water in the direct-heating water inlet pipe or the circulating water inlet pipe from flowing back into the water outlet pipe.

When the anti-freezing control device of the heat pump unit further comprises a booster pump 31, the booster pump 31 is arranged at the inlet of the bypass main pipe 1, and the check valve 32 is arranged at the outlet of the bypass main pipe 1.

For example: as shown in fig. 2, a bypass pipe is added to an outlet pipe orifice of the unit and is respectively connected to a direct-heating inlet pipe and a circulating inlet pipe orifice of the unit, a pressure-increasing water pump and a one-way valve (the one-way valve can prevent cold water from directly entering a water tank) are additionally arranged on a bypass main pipe, and a first anti-freezing electromagnetic water valve and a second anti-freezing electromagnetic water valve are respectively and correspondingly added to the direct-heating bypass branch pipe and the circulating bypass branch pipe. For example: the introduction of the one-way valve can prevent cold water from directly entering the water tank through the bypass pipe, and the comfort of water use of a user is ensured.

From this, through setting up the check valve on the house steward that leads to, can prevent during water refluence in directly hot inlet tube or the circulation inlet tube goes into the outlet pipe, guarantee the play water temperature of outlet pipe, and then guarantee that the user uses hydrothermal travelling comfort to experience, the reliability is high, and is humanized good.

In an alternative embodiment, the method may further include: temperature sensing module and controller.

In an optional example, the temperature sensing module may be configured to obtain at least one of a temperature of directly hot inlet water at an inlet of the directly hot inlet water pipe, a temperature of circulating inlet water at an inlet of the circulating inlet water pipe, and an ambient temperature of an environment in which the heat pump unit is located.

Optionally, the temperature sensing module may include: at least one of a direct-heating water inlet pipe thermal bulb 35, a circulating water inlet thermal bulb 36 and an environment thermal bulb.

In an alternative embodiment, the directly-heated water inlet pipe thermal bulb 35 is disposed at the inlet of the directly-heated water inlet pipe, and can be used to obtain the directly-heated water inlet temperature at the inlet of the directly-heated water inlet pipe. For example: as shown in fig. 2, a direct-heating water inlet temperature sensing bulb is installed at the position of the direct-heating water inlet pipe to detect the temperature of the direct-heating water inlet.

In an alternative embodiment, the circulating inlet thermal bulb 36, disposed at the inlet of the circulating inlet pipe, may be used to obtain the circulating inlet temperature at the inlet of the circulating inlet pipe. For example: as shown in fig. 2, a circulating water inlet temperature sensing bulb is arranged on the circulating water inlet pipe, and the circulating water inlet temperature is detected.

In an optional specific example, the environmental temperature sensing bulb is disposed in an environment where the heat pump unit is located, and may be configured to obtain an environmental temperature of the environment where the heat pump unit is located.

For example: as shown in fig. 2, the anti-freezing control is mainly performed by the booster water pump, the check valve, the first anti-freezing electromagnetic water valve (i.e., the first anti-freezing electromagnetic valve) and the second anti-freezing electromagnetic water valve (i.e., the second anti-freezing electromagnetic valve), the direct-heating water inlet temperature sensing bulb and the circulating water inlet temperature sensing bulb.

From this, obtain corresponding temperature parameter through the temperature sensing package of multiform, the acquisition mode is convenient, and the acquisition result is reliable, is favorable to promoting the reliability and the accurate nature of independently preventing frostbite and handling the inlet tube.

In an optional example, the controller, respectively connected to the first antifreezing solenoid valve 33, the second antifreezing solenoid valve 34, the booster pump 31, and further connected to at least one of the direct-heat water inlet pipe bulb 35, the circulating water inlet bulb 36, and the environment bulb, may be configured to determine whether the environment temperature is less than a preset antifreezing opening ring temperature.

Further, the controller may be further configured to further determine whether the heat pump unit is currently operating in a circulating hot water heating mode or a direct hot water heating mode if the ambient temperature is less than the anti-freeze open loop temperature; and if the environmental temperature is greater than or equal to the anti-freezing opening ring temperature, closing the booster pump 31, and closing both the first anti-freezing electromagnetic valve 33 and the second anti-freezing electromagnetic valve 34.

For example: as shown in fig. 3, when the ambient temperature is detected to be lower than the anti-freeze opening ring temperature, the operation mode of the unit is continuously detected.

Further, the controller can be further configured to control a part of hot water in the water outlet pipe to flow into the direct-heat water inlet pipe through the direct-heat bypass branch pipe 2 by the first anti-freezing electromagnetic valve 33 if the heat pump unit is currently operated in the circulating hot water heating mode, so as to achieve anti-freezing control of the direct-heat water inlet pipe.

For example: as shown in fig. 3, if the unit is determined to be in the circulating hot water mode, the direct hot inlet water temperature is further detected.

Alternatively, the controller may control a portion of the hot water in the water outlet pipe to flow into the direct-heating water inlet pipe through the direct-heating bypass branch pipe 2 by the first anti-freezing solenoid valve 33, and may include:

the controller may be further configured to determine whether the direct hot inlet water temperature is less than a predetermined freeze start water temperature.

The controller may be further configured to, if the direct-heat inlet water temperature is lower than the anti-freezing opening water temperature, turn on the first anti-freezing solenoid valve 33, so that a portion of hot water in the outlet pipe flows into the direct-heat inlet pipe through the direct-heat bypass branch pipe 2; if the direct hot inlet water temperature is greater than or equal to the anti-freezing opening water temperature, the first anti-freezing electromagnetic valve 33 is turned off to prevent a part of hot water in the outlet pipe from flowing into the direct hot inlet pipe through the direct hot bypass branch pipe 2.

For example: as shown in fig. 3, if the direct hot inlet water temperature is lower than the anti-freezing opening water temperature, the master control inputs a start signal of the booster water pump, the first anti-freezing electromagnetic valve is opened, and at the moment, a part of hot water in the water outlet pipe enters the direct hot inlet pipe through the bypass 1-2 to mix cold water, so that the pipeline is prevented from being frozen.

Therefore, the first anti-freezing electromagnetic valve is controlled under the condition that the direct-heating water inlet temperature is lower than the anti-freezing opening water temperature in the circulating water heating mode to enable part of hot water in the water outlet pipe to flow into the direct-heating water inlet pipe, so that anti-freezing treatment of the direct-heating water inlet pipe is achieved, the anti-freezing effect is good, the structure is simple, and maintenance is convenient.

Further optionally, the controller controls a portion of the hot water in the water outlet pipe to flow into the direct-heating water inlet pipe through the direct-heating bypass branch pipe 2 by the first anti-freezing electromagnetic valve 33, and may further include:

the controller can also be used for determining whether the temperature of the directly-heated inlet water is greater than the preset anti-freezing exit water temperature within a first preset time period after a part of hot water in the outlet pipe flows into the directly-heated inlet water pipe through the directly-heated bypass branch pipe 2.

The controller can also be used for enabling the first anti-freezing electromagnetic valve 33 to be turned off if the direct hot water inlet temperature is greater than the anti-freezing exit water temperature in the first preset time period, so as to stop enabling part of hot water in the water outlet pipe to flow into the direct hot water inlet pipe through the direct hot bypass branch pipe 2.

For example: as shown in fig. 3, after hot water enters the direct-heating water inlet pipe, when the direct-heating water inlet temperature is detected to be greater than the anti-freezing exit water temperature (which can be set to 30 ℃) for 30 seconds continuously, the booster water pump and the first anti-freezing electromagnetic valve are closed; otherwise, the booster water pump and the first anti-freezing electromagnetic valve are kept to be opened.

Therefore, after the direct-heat water inlet pipe is subjected to anti-freezing treatment, under the condition that the temperature of the direct-heat water inlet pipe is increased to be higher than the anti-freezing exit water temperature, the first anti-freezing electromagnetic valve is controlled to stop the hot water in the water outlet pipe from flowing into the direct-heat water inlet pipe, so that the hot water in the water outlet pipe is saved on the premise of ensuring the anti-freezing treatment effect of the direct-heat water inlet pipe, and the energy-saving effect is good.

Or, the controller may be further configured to control, if the heat pump unit is currently operating in the direct heating hot water mode, a portion of the hot water in the water outlet pipe to flow into the circulating water inlet pipe through the circulating bypass branch pipe 3 by using the second anti-freezing electromagnetic valve 34, so as to achieve anti-freezing control of the circulating water inlet pipe.

For example: for example: and if the unit is judged to be in the direct heating hot water mode, further detecting the temperature of the circulating inlet water.

From this, acquire temperature parameters such as direct hot temperature of intaking through the temperature sensing module, circulation temperature of intaking, ambient temperature, and then confirm through the controller that the ambient temperature is less than under the condition of preventing frostbite and opening the ring temperature, further confirm that the corresponding temperature of intaking under the corresponding operating mode of heat pump set is less than under the condition of preventing frostbite and opening the temperature and confirm to need to carry out frostproofing control to the inlet tube, and then control frostproofing through first solenoid valve or the frostproofing solenoid valve of second to corresponding inlet tube for the effect and the reliability of frostproofing control all can obtain guaranteeing.

Alternatively, the controller may control a portion of the hot water in the water outlet pipe to flow into the circulation water inlet pipe through the circulation bypass branch pipe 3 by the second anti-freezing solenoid valve 34, and may include:

the controller may also be configured to determine whether the circulating inlet water temperature is less than a predetermined freeze start water temperature.

The controller may be further configured to, if the temperature of the circulating inlet water is lower than the anti-freezing opening water temperature, turn on the second anti-freezing solenoid valve 34, so that a part of the hot water in the outlet pipe flows into the circulating inlet pipe through the circulating bypass branch pipe 3; if the circulating inlet water temperature is greater than or equal to the anti-freezing opening water temperature, the second anti-freezing electromagnetic valve 34 is turned off to prevent a part of hot water in the outlet pipe from flowing into the circulating inlet pipe through the circulating bypass branch pipe 3.

For example: as shown in fig. 3, if the temperature of the circulating inlet water is higher than the anti-freezing opening water temperature (which can be set to 2 ℃), the booster water pump and the second anti-freezing electromagnetic valve are not opened; if the circulating inlet water temperature is lower than the anti-freezing starting water temperature, a main control input booster water pump starting signal, a second anti-freezing electromagnetic valve is started, and at the moment, a part of hot water in a water outlet pipe enters a circulating inlet pipe through a bypass 1-3 to mix cold water, so that the pipeline is prevented from being frozen.

Therefore, the second anti-freezing electromagnetic valve is controlled to enable part of hot water in the water outlet pipe to flow into the circulating water inlet pipe under the condition that the circulating water inlet temperature is lower than the anti-freezing opening water temperature in the direct heating hot water mode, so that anti-freezing treatment of the circulating water inlet pipe is achieved, the anti-freezing effect is good, the structure is simple, and the maintenance is convenient.

Further optionally, the controller controls a portion of the hot water in the water outlet pipe to flow into the circulating water inlet pipe through the circulating bypass branch pipe 3 through the second anti-freezing solenoid valve 34, and may further include:

the controller can also be used for determining whether the circulating inlet water temperature is greater than the preset anti-freezing outlet water temperature within a second preset time period after a part of hot water in the water outlet pipe flows into the circulating inlet water pipe through the circulating bypass branch pipe 3.

The controller can also be used for enabling the second anti-freezing electromagnetic valve 34 to be turned off if the circulating water inlet temperature is greater than the anti-freezing exit water temperature in the second preset time period, so as to stop enabling a part of hot water in the water outlet pipe to flow into the circulating water inlet pipe through the circulating bypass branch pipe 3.

For example: as shown in fig. 3, after hot water enters the circulating water inlet pipe, when the circulating water inlet temperature is detected to be greater than the anti-freezing exit water temperature (which can be set to 30 ℃) continuously for 30s, the booster water pump and the second anti-freezing electromagnetic valve are closed, otherwise, the booster water pump and the second anti-freezing electromagnetic valve are kept open. In the whole process, the first anti-freezing electromagnetic valve is always in a closed state.

Therefore, after the cycle water inlet pipe is subjected to anti-freezing treatment, the second anti-freezing electromagnetic valve is controlled to stop hot water in the water outlet pipe from flowing into the cycle water inlet pipe under the condition that the cycle water inlet temperature is increased to be higher than the anti-freezing exit water temperature, so that the hot water in the water outlet pipe is saved on the premise of ensuring the anti-freezing treatment effect of the cycle water inlet pipe, and the energy-saving effect is good.

Optionally, when the anti-freezing control device of the heat pump unit further includes a booster pump 31, the controller may be further configured to control a portion of the hot water in the water outlet pipe to flow into the direct-heat water inlet pipe through the direct-heat bypass branch pipe 2 by the first anti-freezing solenoid valve 33, or control a portion of the hot water in the water outlet pipe to flow into the circulating water inlet pipe through the circulating bypass branch pipe 3 by the second anti-freezing solenoid valve 34, and any one of the following situations may be included.

The first case: the controller can also be used for enabling the booster pump 31 to be started if the direct-heating water inlet temperature is smaller than the anti-freezing starting water temperature or the circulating water inlet temperature is smaller than the anti-freezing starting water temperature.

The second case: the controller can also be used for if in first predetermined duration the direct-heating temperature of intaking is greater than prevent frostbite and withdraw from the temperature, or in the second predetermined duration the circulation temperature of intaking is greater than prevent frostbite and withdraw from the temperature, then the booster pump 31 is closed.

For example: the controlling of a portion of hot water in the outlet pipe to flow into the direct-heating inlet pipe through the direct-heating bypass branch pipe 2 by the first anti-freezing solenoid valve 33 may further include: if the direct-heating inlet water temperature is lower than the anti-freezing opening water temperature, the booster pump 31 is started; and/or if the direct hot water inlet temperature is higher than the anti-freezing water outlet temperature within the first preset time period, the booster pump 31 is turned off.

For example: the controlling of a portion of hot water in the outlet pipe to flow into the direct-heating inlet pipe through the direct-heating bypass branch pipe 2 by the first anti-freezing solenoid valve 33 may further include: when the anti-freezing control device of the heat pump unit further comprises a booster pump 31, the controller controls a part of hot water in the water outlet pipe to flow into the circulating water inlet pipe through the circulating bypass branch pipe 3 by the second anti-freezing electromagnetic valve 34, and the anti-freezing control device of the heat pump unit further comprises: if the circulating inlet water temperature is lower than the anti-freezing starting water temperature, the booster pump 31 is started; and/or if the circulating inlet water temperature is greater than the anti-freezing outlet water temperature within the second preset time period, the booster pump 31 is turned off.

From this, through the control water pressure through the booster pump in the processing procedure that prevents frostbite to corresponding inlet tube, can adjust the processing efficiency that prevents frostbite in a flexible way to promote the efficiency and the effect of preventing frostbite and handle, the simple operation nature is good.

Through a large amount of experimental verifications, adopt the technical scheme of this embodiment, through the outlet pipe mouth at the unit increase bypass pipe all the way, be connected to the directly hot inlet tube and the circulation inlet pipe mouth of unit respectively, install booster pump additional on the bypass house steward, directly hot and circulation bypass branch pipe correspond respectively and increase first anti-freezing electromagnetism water valve and the anti-freezing electromagnetism water valve of second, thereby the hot water and the low-temperature water that unit self produced are mixed to the mode of bypass, the mainboard is according to ring temperature and the water temperature control booster pump open and stop and the electromagnetic valve switch that prevents frostbite, in frostbite, consider energy-conservation.

According to the embodiment of the invention, the heat pump unit corresponding to the anti-freezing control device of the heat pump unit is also provided. The heat pump unit may include: the anti-freezing control device of the heat pump unit is provided.

In an alternative embodiment, the present invention is directed to an automatic anti-freezing method for a water intake pipe of a heat pump unit, which prevents the water intake pipe of the heat pump unit from being frozen in winter.

Specifically, the main idea of the invention is to mix hot water and low-temperature water generated by the unit by a bypass mode, so as to prevent the water inlet pipe from being frozen due to the standing of the low-temperature water in winter. The main board controls the booster water pump to be started and stopped and the anti-freezing electromagnetic valve to be switched on and off according to the environment temperature and the water temperature, and energy conservation is achieved while freezing is prevented. On the other hand, the introduction of the one-way valve can prevent cold water from directly entering the water tank through the bypass pipe, and the comfort of water use of a user is ensured.

As shown in fig. 1, in a schematic diagram of a conventional direct-heating circulation type unit for preventing freezing of a water path, a heat tracing band 16 is laid on a direct-heating water inlet pipe and a circulation water inlet pipe, and when an ambient temperature is lower than a certain set value, an electric heating band is turned on to heat and prevent freezing of a water pipe, which has the following disadvantages: it is difficult to cover the entire water pipe, especially the coverage rate to the waterway valve member is worse. When the ambient temperature is low and standing water appears in the water pipe, the water pipe or the valve is easy to freeze.

In fig. 1, the inlet of the direct-heating water inlet pipe and the inlet of the circulating water inlet pipe are arranged in parallel, and the outlet of the direct-heating water inlet pipe and the outlet of the circulating water inlet pipe are communicated and then connected to the water inlet end of the water-side heat exchanger 12; a water pressure switch 15, an electromagnetic water valve 14 and a warm water valve 13 are sequentially arranged on the direct-heating water inlet pipe from the inlet of the direct-heating water inlet pipe to the outlet of the direct-heating water inlet pipe, a check valve 17 is arranged on the circulating water inlet pipe from the inlet of the circulating water inlet pipe to the outlet of the circulating water inlet pipe, and a water inlet temperature sensing bag 18 is arranged on a pipeline which is connected to the water inlet end of the water side heat exchanger 12 after the outlet of the direct-heating water inlet pipe and the outlet of the circulating water inlet pipe are communicated. The water outlet end of the water side heat exchanger 12 is connected with a water outlet pipe, and a water outlet temperature sensing bulb 11 is arranged on the water outlet pipe. The heat tracing band 16 is laid along the direct heat inlet pipe and the circulating inlet pipe.

In the invention, anti-freezing control is mainly carried out through the booster water pump, the one-way valve, the first anti-freezing electromagnetic water valve (namely the first anti-freezing electromagnetic valve) and the second anti-freezing electromagnetic water valve (namely the second anti-freezing electromagnetic valve), the direct-heating water inlet temperature sensing bulb and the circulating water inlet temperature sensing bulb. As shown in figure 2, the invention provides a method for preventing freezing by using a high-temperature water outlet bypass, wherein a bypass pipe is added at a water outlet pipe orifice of a unit and is respectively connected to a direct-heating water inlet pipe and a circulating water inlet pipe orifice of the unit, a pressure water pump and a one-way valve (the one-way valve can prevent cold water from directly entering a water tank) are additionally arranged on a bypass main pipe, and a first anti-freezing electromagnetic water valve and a second anti-freezing electromagnetic water valve are respectively and correspondingly added on a direct-heating bypass branch pipe and a circulating bypass. A direct-heating water inlet temperature sensing bulb is arranged on the direct-heating water inlet pipe, and the direct-heating water inlet temperature is detected and recorded as Tzs; a circulating water inlet temperature sensing bulb is arranged on the circulating water inlet pipe, and the detected circulating water inlet temperature is recorded as Txs; defining an ambient temperature Th; the unit meets the requirement that the environment temperature for anti-freezing opening is Tfh; the water temperature meeting the anti-freezing opening is Tfs; the water temperature meeting the requirement of freeze prevention is Tm.

In fig. 2, the inlet of the direct-heating water inlet pipe and the inlet of the circulating water inlet pipe are arranged in parallel, and the outlet of the direct-heating water inlet pipe and the outlet of the circulating water inlet pipe are communicated and then connected to the water inlet end of the water-side heat exchanger 22; a water pressure switch 25, an electromagnetic water valve 24 and a warm water valve 23 are sequentially arranged on the direct-heating water inlet pipe from the inlet of the direct-heating water inlet pipe to the outlet of the direct-heating water inlet pipe, a check valve 26 is arranged on the circulating water inlet pipe from the inlet of the circulating water inlet pipe to the outlet of the circulating water inlet pipe, and a water inlet temperature sensing bulb 27 is arranged on a pipeline which is connected to the water inlet end of the water side heat exchanger 22 after the outlet of the direct-heating water inlet pipe is communicated with the outlet of the circulating water inlet pipe. The water outlet end of the water side heat exchanger 22 is connected with a water outlet pipe, and a water outlet temperature sensing bulb 21 is arranged on the water outlet pipe. A first bypass pipeline 1-2 is arranged between the water outlet of the water outlet pipe and the water inlet of the direct-heating water inlet pipe, a booster water pump 31, a one-way valve 32 and a first anti-freezing electromagnetic valve 33 are sequentially arranged on the first bypass pipeline 1-2, and a direct-heating water inlet temperature sensing bulb 35 is further arranged at the water inlet of the direct-heating water inlet pipe. A branch pipeline is led out between the check valve 32 and the first anti-freezing electromagnetic valve 33 and communicated to a water inlet of the circulating water inlet pipe, and a second anti-freezing electromagnetic valve 34 is arranged on the branch pipeline; the part of the first bypass pipeline 1-2 before the branch pipeline is combined with the branch pipeline to form a second bypass pipeline 1-3, namely, the second bypass pipeline 1-3 is also arranged between the water outlet pipe and the circulating water inlet pipe, and the second bypass pipeline 1-3 is sequentially provided with a booster water pump 31, a one-way valve 32 and a second anti-freezing electromagnetic valve 34. A water inlet of the circulating water inlet pipe is also provided with a circulating water inlet pipe thermal bulb 36.

For a direct-heating circulation type heat pump water heater, if a unit operates in a circulation water heating mode, a warm water valve and an electromagnetic water valve in a direct-heating pipeline are in a closed state, namely water in a direct-heating water inlet pipe is in a static state, the static water is easily frozen when being in a low-temperature environment for a long time, and at the moment, the direct-heating water inlet pipe and valve pieces on the pipe need to be prevented from freezing; on the contrary, if the unit operates in the direct heating water heating mode, the water in the circulating water inlet pipe is in a static state and can be frozen in a low-temperature environment for a long time.

Referring to the example shown in fig. 3, the control method of the present invention: when the environment temperature is detected by the environment temperature sensing bulb of the unit to be higher than the anti-freezing opening ring temperature (if Tfh, the temperature can be set to be 2 ℃), the main control does not output opening signals to the booster water pump and the anti-freezing electromagnetic valve, and the default condition does not meet the anti-freezing entering condition. And when the environment temperature is lower than the anti-freezing opening ring temperature, continuously detecting the operation mode of the unit.

If the unit is judged to be in the circulating hot water making mode, further detecting the direct hot inlet water temperature, and if the direct hot inlet water temperature is higher than the anti-freezing opening water temperature (for example, Tfs can be set to be 2 ℃), not opening the booster water pump and the first anti-freezing electromagnetic valve (for example, the first anti-freezing electromagnetic water valve); if the direct-heating water inlet temperature is lower than the anti-freezing starting water temperature, a main control input booster water pump starting signal, a first anti-freezing electromagnetic valve is started, and at the moment, a part of hot water in a water outlet pipe enters a direct-heating water inlet pipe through a bypass 1-2 to mix cold water and prevent a pipeline from being frozen. After hot water enters the direct-heating water inlet pipe, when the direct-heating water inlet temperature is detected to be greater than the anti-freezing exit water temperature (which can be set to be 30 ℃) within 30 seconds continuously, the booster water pump and the first anti-freezing electromagnetic valve are closed; otherwise, the booster water pump and the first anti-freezing electromagnetic valve are kept to be opened. In the whole process, the second anti-freezing electromagnetic valve (such as the second anti-freezing electromagnetic water valve) is always in a closed state.

If the unit is judged to be in the direct heating hot water mode, the circulating inlet water temperature is further detected, and if the circulating inlet water temperature is higher than the anti-freezing opening water temperature (which can be set to be 2 ℃), the booster water pump and the second anti-freezing electromagnetic valve are not opened; if the circulating inlet water temperature is lower than the anti-freezing starting water temperature, a main control input booster water pump starting signal, a second anti-freezing electromagnetic valve is started, and at the moment, a part of hot water in a water outlet pipe enters a circulating inlet pipe through a bypass 1-3 to mix cold water, so that the pipeline is prevented from being frozen. After hot water enters the circulating water inlet pipe, when the circulating water inlet temperature is detected to be higher than the anti-freezing exit water temperature (which can be set to be 30 ℃) within 30 seconds continuously, the pressure water pump and the second anti-freezing electromagnetic valve are closed, otherwise, the pressure water pump and the second anti-freezing electromagnetic valve are continuously kept open. In the whole process, the first anti-freezing electromagnetic valve is always in a closed state.

Optionally, the anti-freezing opening ring temperature in the embodiment of the invention is set to be 2 ℃, but is not limited to be 2 ℃, and other ring temperatures or a set value can be adopted; the temperature of the anti-freezing starting water is set to be 2 ℃, is not limited to be 2 ℃, and can be other water temperatures or a set value; the temperature of the anti-freezing exiting water is set to be 30 ℃, and can be other water temperatures or a set value.

Therefore, the anti-freezing control method can realize real-time detection of the ambient temperature and the water inlet temperature, comprehensively evaluate the risk of freezing the pipeline and the valve element according to the ambient temperature and the water inlet temperature, perform anti-freezing on the water inlet pipe of the unit while saving energy, and has higher anti-freezing efficiency and better reliability compared with the anti-freezing of the heat tracing band.

Since the processing and functions of the heat pump unit of this embodiment are basically corresponding to the embodiments, principles and examples of the foregoing devices, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of this embodiment.

Through a large number of tests, the technical scheme of the invention is adopted, and the one-way valve is additionally arranged on the bypass main pipe, so that cold water can be prevented from directly entering the water tank through the bypass pipe, and the comfort of water consumption of a user is ensured.

According to the embodiment of the invention, the invention also provides an anti-freezing control method of the heat pump unit corresponding to the heat pump unit. The anti-freezing control method of the heat pump unit can comprise the following two aspects.

On one hand, a part of hot water in the water outlet pipe is controlled to flow into the direct-heating water inlet pipe through the direct-heating bypass branch pipe 2 through the first anti-freezing electromagnetic valve 33, so that anti-freezing control on the direct-heating water inlet pipe is realized.

On the other hand, a part of hot water in the water outlet pipe is controlled to flow into the circulating water inlet pipe through the circulating bypass branch pipe 3 through the second anti-freezing electromagnetic valve 34, so that anti-freezing control on the circulating water inlet pipe is realized.

In an alternative embodiment, at least one of the following situations may also be included.

The first case: when the heat pump unit can also comprise a booster pump 31, the booster pump 31 controls the water pressure when a part of hot water in the water outlet pipe flows into the direct-heating water inlet pipe or the circulating water inlet pipe through the circulating bypass branch pipe 3.

The second case: when the heat pump unit can also comprise a one-way valve 32, the water in the direct-heating water inlet pipe or the circulating water inlet pipe is prevented from flowing back into the water outlet pipe through the one-way valve 32.

In an alternative example, the specific implementation process of the anti-freezing control method of the heat pump unit of the present invention, that is, the specific processes of the anti-freezing control of the direct-heat water inlet pipe and the anti-freezing control of the circulating water inlet pipe, may further be described with reference to the flowchart of fig. 4 illustrating an embodiment of the anti-freezing control method of the heat pump unit of the present invention, which may include steps S110 to S150.

At step S110, when the heat pump unit may further include a temperature sensing module, at least one of the direct-heating water inlet temperature at the inlet of the direct-heating water inlet pipe, the circulating water inlet temperature at the inlet of the circulating water inlet pipe, and the ambient temperature of the environment where the heat pump unit is located is obtained through the temperature sensing module.

At step S120, it is determined whether the ambient temperature is less than a preset freeze open ring temperature.

At step S130, if the ambient temperature is less than the anti-freeze open loop temperature, further determining whether the heat pump unit is currently operating in a circulating hot water heating mode or a direct hot water heating mode; and if the environmental temperature is greater than or equal to the anti-freezing opening ring temperature, closing the booster pump 31, and closing both the first anti-freezing electromagnetic valve 33 and the second anti-freezing electromagnetic valve 34.

In step S140, if the heat pump unit is currently operating in the circulating hot water mode, the first anti-freezing solenoid valve 33 controls a portion of hot water in the water outlet pipe to flow into the direct-heating water inlet pipe through the direct-heating bypass branch pipe 2, so as to achieve anti-freezing control of the direct-heating water inlet pipe.

Alternatively, the step S140 of controlling a portion of the hot water in the water outlet pipe to flow into the direct-heating water inlet pipe through the direct-heating bypass branch pipe 2 by the first anti-freezing solenoid valve 33 may include: and controlling the entering control process of a part of hot water in the water outlet pipe flowing into the direct-heating water inlet pipe through the direct-heating bypass branch pipe by the first anti-freezing electromagnetic valve.

In the method of the present invention shown in fig. 5, a specific process of controlling the entry of a portion of hot water in the water outlet pipe into the direct-heating water inlet pipe through the direct-heating bypass branch pipe in step S140 by the first anti-freezing solenoid valve will be further described with reference to a flowchart of an embodiment of controlling the entry of a portion of hot water in the water outlet pipe into the direct-heating water inlet pipe through the direct-heating bypass branch pipe by the first anti-freezing solenoid valve, which may include step S210 and step S220.

And step S210, determining whether the direct hot inlet water temperature is less than a preset anti-freezing opening water temperature.

Step S220, if the direct-heating inlet water temperature is lower than the anti-freezing opening water temperature, the first anti-freezing electromagnetic valve 33 is switched on, so that a part of hot water in the water outlet pipe flows into the direct-heating inlet pipe through the direct-heating bypass branch pipe 2; if the direct hot inlet water temperature is greater than or equal to the anti-freezing opening water temperature, the first anti-freezing electromagnetic valve 33 is turned off to prevent a part of hot water in the outlet pipe from flowing into the direct hot inlet pipe through the direct hot bypass branch pipe 2.

Further optionally, the step S140 of controlling a portion of the hot water in the water outlet pipe to flow into the direct-heating water inlet pipe through the direct-heating bypass branch pipe 2 by the first anti-freezing solenoid valve 33 may include:

the controlling of a portion of hot water in the outlet pipe to flow into the direct-heating inlet pipe through the direct-heating bypass branch pipe 2 by the first anti-freezing solenoid valve 33 may further include: the process of controlling the exit of a part of hot water in the water outlet pipe flowing into the straight hot water inlet pipe through the straight hot bypass branch pipe by the first anti-freezing solenoid valve may include steps S310 and S320.

Next, referring to a schematic flow chart of an embodiment of controlling the exit control of a portion of hot water in the water outlet pipe flowing into the straight hot water inlet pipe through the straight hot bypass branch pipe by the first anti-freezing solenoid valve in the method of the present invention shown in fig. 7, a specific process of controlling the exit control of a portion of hot water in the water outlet pipe flowing into the straight hot water inlet pipe through the straight hot bypass branch pipe by the first anti-freezing solenoid valve in step S140 will be further described.

Step S310, after a part of the hot water in the water outlet pipe flows into the direct-heating water inlet pipe through the direct-heating bypass branch pipe 2, determining whether the direct-heating inlet water temperature is greater than a preset anti-freezing outlet water temperature within a first preset time period.

Step S320, if the direct hot water inlet temperature is greater than the anti-freezing exit water temperature within the first preset time period, the first anti-freezing electromagnetic valve 33 is turned off to stop allowing a part of hot water in the water outlet pipe to flow into the direct hot water inlet pipe through the direct hot bypass branch pipe 2.

In step S150, if the heat pump unit is currently operating in the direct-heating hot water mode, the second anti-freezing solenoid valve 34 controls a portion of hot water in the water outlet pipe to flow into the circulating water inlet pipe through the circulating bypass branch pipe 3, so as to achieve anti-freezing control of the circulating water inlet pipe.

Alternatively, the step S150 of controlling a portion of the hot water in the water outlet pipe to flow into the circulation inlet pipe through the circulation bypass branch pipe 3 by the second anti-freezing solenoid valve 34 may include: the process of controlling the inflow of a portion of the hot water in the outlet pipe into the circulation inlet pipe through the circulation bypass branch pipe by the second anti-freezing solenoid valve may include steps S410 and S420.

The specific process of controlling the entry of the portion of the hot water in the water outlet pipe flowing into the circulation inlet pipe through the circulation bypass branch pipe in step S150 by the second anti-freezing solenoid valve will be further described with reference to the flowchart of fig. 6, which shows an embodiment of controlling the entry of the portion of the hot water in the water outlet pipe flowing into the circulation inlet pipe through the circulation bypass branch pipe by the second anti-freezing solenoid valve.

And step S410, determining whether the circulating inlet water temperature is less than a preset anti-freezing opening water temperature.

Step S420, if the temperature of the circulating inlet water is lower than the antifreeze starting water temperature, the second antifreeze electromagnetic valve 34 is turned on, so that a part of hot water in the outlet pipe flows into the circulating inlet pipe through the circulating bypass branch pipe 3; if the circulating inlet water temperature is greater than or equal to the anti-freezing opening water temperature, the second anti-freezing electromagnetic valve 34 is turned off to prevent a part of hot water in the outlet pipe from flowing into the circulating inlet pipe through the circulating bypass branch pipe 3.

Further optionally, the step S150 of controlling a portion of the hot water in the water outlet pipe to flow into the circulating water inlet pipe through the circulating bypass branch pipe 3 by the second anti-freezing electromagnetic valve 34 may further include: the process of controlling the exit of a portion of the hot water in the outlet pipe to the circulation inlet pipe through the circulation bypass branch pipe by the second anti-freezing solenoid valve may include steps S510 and S520.

The specific process of the step S150 of controlling the exit control of the portion of the hot water in the water outlet pipe flowing into the circulating inlet pipe through the circulating bypass branch pipe by the second anti-freezing solenoid valve is further described with reference to the flowchart of fig. 8, which shows an embodiment of controlling the exit control of the portion of the hot water in the water outlet pipe flowing into the circulating inlet pipe through the circulating bypass branch pipe by the second anti-freezing solenoid valve.

Step S510, after a part of the hot water in the water outlet pipe flows into the circulating water inlet pipe through the circulating bypass branch pipe 3, determining whether the circulating inlet water temperature is greater than a preset anti-freezing outlet water temperature within a second preset time period.

And step S520, if the circulating inlet water temperature is higher than the anti-freezing outlet water temperature within the second preset time, the second anti-freezing electromagnetic valve 34 is turned off to stop enabling a part of hot water in the outlet pipe to flow into the circulating inlet pipe through the circulating bypass branch pipe 3.

Optionally, when the heat pump unit may further include a booster pump 31, the first anti-freezing solenoid valve 33 controls a portion of the hot water in the water outlet pipe to flow into the direct-heating water inlet pipe through the direct-heating bypass branch pipe 2 in step S140, or the second anti-freezing solenoid valve 34 controls a portion of the hot water in the water outlet pipe to flow into the circulation water inlet pipe through the circulation bypass branch pipe 3 in step S150, and at least one of the following situations may be included.

The first case: and if the direct-heating water inlet temperature is lower than the anti-freezing starting water temperature or the circulating water inlet temperature is lower than the anti-freezing starting water temperature, the booster pump 31 is started.

The second case: if the direct hot water inlet temperature is greater than the anti-freezing exit water temperature within the first preset time period or the circulating water inlet temperature is greater than the anti-freezing exit water temperature within the second preset time period, the booster pump 31 is turned off.

For example: when the anti-freezing control device of the heat pump unit further comprises a booster pump 31, the first anti-freezing electromagnetic valve 33 controls a part of hot water in the water outlet pipe to flow into the direct-heating water inlet pipe through the direct-heating bypass branch pipe 2, and the anti-freezing control device of the heat pump unit further comprises: if the direct-heating inlet water temperature is lower than the anti-freezing opening water temperature, the booster pump 31 is started; and/or if the direct hot water inlet temperature is higher than the anti-freezing water outlet temperature within the first preset time period, the booster pump 31 is turned off.

For example: when the anti-freezing control device of the heat pump unit further comprises a booster pump 31, the controller controls a part of hot water in the water outlet pipe to flow into the circulating water inlet pipe through the circulating bypass branch pipe 3 by the second anti-freezing electromagnetic valve 34, and the anti-freezing control device of the heat pump unit further comprises: if the circulating inlet water temperature is lower than the anti-freezing starting water temperature, the booster pump 31 is started; and/or if the circulating inlet water temperature is greater than the anti-freezing outlet water temperature within the second preset time period, the booster pump 31 is turned off.

Since the processing and functions implemented by the method of this embodiment basically correspond to the embodiments, principles and examples of the heat pump unit, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of this embodiment.

Through a large number of tests, the technical scheme of the invention can realize real-time detection of the ambient temperature and the inlet water temperature by mixing the hot water and the low-temperature water generated by the unit, comprehensively evaluate the risk of freezing the pipeline and the valve element through the ambient temperature and the inlet water temperature, perform antifreezing on the water inlet pipe of the unit while saving energy, and has higher antifreezing efficiency and better reliability compared with the anti-freezing of the heat tracing band.

In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.

The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. The utility model provides a heat pump set's freeze-proof controlling means which characterized in that includes: the system comprises a bypass main pipe (1), a direct-heating bypass branch pipe (2), a circulating bypass branch pipe (3), a first anti-freezing electromagnetic valve (33) and a second anti-freezing electromagnetic valve (34); wherein,

the water outlet pipe of the heat pump unit is divided into two paths after passing through the bypass main pipe (1), the first path is communicated to the direct-heat water inlet pipe of the heat pump unit through the direct-heat bypass branch pipe (2), and the second path is communicated to the circulating water inlet pipe of the heat pump unit through the circulating bypass branch pipe (3);

the first anti-freezing electromagnetic valve (33) is arranged on the direct-heating bypass branch pipe (2) and is used for controlling a part of hot water in the water outlet pipe to flow into the direct-heating water inlet pipe through the direct-heating bypass branch pipe (2) so as to realize anti-freezing control on the direct-heating water inlet pipe;

the second anti-freezing electromagnetic valve (34) is arranged on the circulating bypass branch pipe (3) and is used for controlling a part of hot water in the water outlet pipe to flow into the circulating water inlet pipe through the circulating bypass branch pipe (3) so as to realize anti-freezing control on the circulating water inlet pipe;

further comprising: a temperature sensing module and a controller; wherein,

the temperature sensing module is used for acquiring at least one of the direct hot inlet water temperature at the inlet of the direct hot inlet water pipe, the circulating inlet water temperature at the inlet of the circulating inlet water pipe and the environmental temperature of the environment where the heat pump unit is located;

the controller is used for determining whether the environment temperature is less than a preset anti-freezing opening ring temperature;

if the environment temperature is lower than the anti-freezing opening ring temperature, further determining whether the heat pump unit operates in a circulating water heating mode or a direct water heating mode;

if the heat pump unit is currently operated in the circulating hot water heating mode, controlling a part of hot water in the water outlet pipe to flow into the direct heat water inlet pipe through the direct heat bypass branch pipe (2) by the first anti-freezing electromagnetic valve (33);

if the heat pump unit is currently operated in the direct heating hot water mode, a part of hot water in the water outlet pipe is controlled to flow into the circulating water inlet pipe through the circulating bypass branch pipe (3) through the second anti-freezing electromagnetic valve (34).

2. The apparatus of claim 1, further comprising: a booster pump (31);

the booster pump (31) is arranged on the bypass main pipe (1) and is used for controlling the water pressure when a part of hot water in the water outlet pipe flows into the direct-heating water inlet pipe or the circulating water inlet pipe through the circulating bypass branch pipe (3).

3. The apparatus of claim 1 or 2, further comprising: a check valve (32);

the check valve (32) is arranged on the bypass main pipe (1) and is used for preventing water in the direct-heating water inlet pipe or the circulating water inlet pipe from flowing back into the water outlet pipe;

when the anti-freezing control device of the heat pump unit further comprises a booster pump (31), the booster pump (31) is arranged at an inlet of the bypass main pipe (1), and the check valve (32) is arranged at an outlet of the bypass main pipe (1).

4. The apparatus of claim 1, wherein,

the controller controls a part of hot water in the water outlet pipe to flow into the direct-heating water inlet pipe through the direct-heating bypass branch pipe (2) through the first anti-freezing electromagnetic valve (33), and the controller comprises:

determining whether the direct hot inlet water temperature is less than a preset anti-freezing opening water temperature;

if the direct-heating inlet water temperature is lower than the anti-freezing opening water temperature, the first anti-freezing electromagnetic valve (33) is communicated, so that a part of hot water in the water outlet pipe flows into the direct-heating inlet water pipe through the direct-heating bypass branch pipe (2);

or,

the controller controls a part of hot water in the water outlet pipe to flow into the circulating water inlet pipe through the circulating bypass branch pipe (3) through the second anti-freezing electromagnetic valve (34), and the controller comprises:

determining whether the circulating inlet water temperature is less than a preset anti-freezing opening water temperature;

if the circulating inlet water temperature is lower than the anti-freezing opening water temperature, the second anti-freezing electromagnetic valve (34) is communicated, so that a part of hot water in the water outlet pipe flows into the circulating inlet pipe through the circulating bypass branch pipe (3).

5. The apparatus of claim 4, wherein,

the controller controls a part of hot water in the water outlet pipe to flow into the direct-heating water inlet pipe through the direct-heating bypass branch pipe (2) through the first anti-freezing electromagnetic valve (33), and the controller further comprises:

after a part of hot water in the water outlet pipe flows into the direct-heating water inlet pipe through the direct-heating bypass branch pipe (2), determining whether the direct-heating inlet water temperature is greater than a preset anti-freezing outlet water temperature within a first preset time period;

if the direct hot inlet water temperature is higher than the anti-freezing outlet water temperature within the first preset time, the first anti-freezing electromagnetic valve (33) is turned off to stop enabling a part of hot water in the water outlet pipe to flow into the direct hot inlet pipe through the direct hot bypass branch pipe (2);

or,

the controller controls a part of hot water in the water outlet pipe to flow into the circulating water inlet pipe through the circulating bypass branch pipe (3) through the second anti-freezing electromagnetic valve (34), and the controller further comprises:

after a part of hot water in the water outlet pipe flows into the circulating water inlet pipe through the circulating bypass branch pipe (3), determining whether the circulating inlet water temperature is greater than a preset anti-freezing outlet water temperature within a second preset time period;

if the circulating water inlet temperature is higher than the anti-freezing water outlet temperature within the second preset time, the second anti-freezing electromagnetic valve (34) is turned off to stop enabling a part of hot water in the water outlet pipe to flow into the circulating water inlet pipe through the circulating bypass branch pipe (3).

6. The apparatus according to claim 5, wherein when the anti-freezing control device of the heat pump unit further comprises a booster pump (31), the controller is further configured to control a portion of hot water in the outlet pipe to flow into the direct-heat inlet pipe through the direct-heat bypass branch pipe (2) by the first anti-freezing solenoid valve (33) or control a portion of hot water in the outlet pipe to flow into the circulation inlet pipe through the circulation bypass branch pipe (3) by the second anti-freezing solenoid valve (34), and further comprising:

if the direct-heating water inlet temperature is lower than the anti-freezing starting water temperature or the circulating water inlet temperature is lower than the anti-freezing starting water temperature, the booster pump (31) is started; and/or the presence of a gas in the gas,

if the direct-heating water inlet temperature is greater than the anti-freezing water outlet temperature within the first preset time period or the circulating water inlet temperature is greater than the anti-freezing water outlet temperature within the second preset time period, the booster pump (31) is turned off.

7. The apparatus of any one of claims 1, 2, 4-6, wherein the temperature sensing module comprises: at least one of a direct-heating water inlet pipe thermal bulb (35), a circulating water inlet thermal bulb (36) and an environment thermal bulb; wherein,

the direct-heating water inlet pipe thermal bulb (35) is used for acquiring the direct-heating water inlet temperature at the inlet of the direct-heating water inlet pipe;

the circulating water inlet temperature sensing bulb (36) is used for acquiring the circulating water inlet temperature at the inlet of the circulating water inlet pipe;

the environment temperature sensing bag is used for acquiring the environment temperature of the environment where the heat pump unit is located.

8. The apparatus of claim 3, wherein the temperature sensing module comprises: at least one of a direct-heating water inlet pipe thermal bulb (35), a circulating water inlet thermal bulb (36) and an environment thermal bulb; wherein,

9. A heat pump unit, comprising: an antifreeze control device of a heat pump unit according to any one of claims 1 to 8.

10. A freeze protection control method for a heat pump unit according to claim 9, comprising:

controlling a part of hot water in the water outlet pipe to flow into the direct-heating water inlet pipe through the direct-heating bypass branch pipe (2) through a first anti-freezing electromagnetic valve (33) so as to realize anti-freezing control on the direct-heating water inlet pipe;

controlling a part of hot water in the water outlet pipe to flow into the circulating water inlet pipe through the circulating bypass branch pipe (3) through a second anti-freezing electromagnetic valve (34) so as to realize anti-freezing control on the circulating water inlet pipe;

further comprising:

acquiring at least one of the direct-heating inlet water temperature at the inlet of the direct-heating water inlet pipe, the circulating inlet water temperature at the inlet of the circulating water inlet pipe and the environmental temperature of the environment where the heat pump unit is located;

determining whether the environment temperature is less than a preset anti-freezing opening ring temperature;

11. The method of claim 10, further comprising:

controlling the water pressure when a part of hot water in the water outlet pipe flows into the direct-heating water inlet pipe or the circulating water inlet pipe through the circulating bypass branch pipe (3);

and/or the presence of a gas in the gas,

and water in the direct-heating water inlet pipe or the circulating water inlet pipe is prevented from flowing back into the water outlet pipe.

12. The method of claim 10, wherein,

controlling a part of hot water in the water outlet pipe to flow into the direct-heating water inlet pipe through the direct-heating bypass branch pipe (2) through the first anti-freezing electromagnetic valve (33), and comprising the following steps:

or,

controlling a portion of the hot water in the outlet pipe to flow into the circulating inlet pipe through the circulating bypass branch pipe (3) by the second anti-freezing electromagnetic valve (34), comprising:

13. The method of claim 12, wherein,

controlling a part of hot water in the water outlet pipe to flow into the direct-heating water inlet pipe through the direct-heating bypass branch pipe (2) through the first anti-freezing electromagnetic valve (33), and further comprising:

or,

controlling a part of hot water in the water outlet pipe to flow into the circulating water inlet pipe through the circulating bypass branch pipe (3) through the second anti-freezing electromagnetic valve (34), and further comprising:

14. The method according to claim 13, wherein when the heat pump unit further comprises a booster pump (31), controlling a portion of hot water in the outlet pipe to flow into the direct-heat inlet pipe through the direct-heat bypass branch pipe (2) by the first anti-freeze solenoid valve (33) or controlling a portion of hot water in the outlet pipe to flow into the circulation inlet pipe through the circulation bypass branch pipe (3) by the second anti-freeze solenoid valve (34), further comprising: