CN211876450U - Air source heat pump system - Google Patents
Air source heat pump system Download PDFInfo
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- CN211876450U CN211876450U CN202020347772.3U CN202020347772U CN211876450U CN 211876450 U CN211876450 U CN 211876450U CN 202020347772 U CN202020347772 U CN 202020347772U CN 211876450 U CN211876450 U CN 211876450U
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Abstract
The utility model provides an air source heat pump system, including compressor, heating circuit and defrosting pipeline. The heating circuit comprises an indoor heat exchanger, a heating liquid supply pipeline and an air suction pipeline which are connected in series; the heating liquid supply pipeline comprises a plurality of liquid supply bypasses, and each liquid supply bypass is used for being communicated with a corresponding outdoor heat exchanger; the air suction pipeline comprises a plurality of air suction bypasses, and each air suction bypass is used for being communicated with the corresponding outdoor heat exchanger through the corresponding defrosting valve. One end of the defrosting pipeline is communicated with an outlet of the compressor; the defrosting pipeline comprises a plurality of defrosting bypasses, and each defrosting bypass is communicated with the corresponding outdoor heat exchanger through the corresponding defrosting valve and is communicated with the heating liquid supply pipeline through the corresponding outdoor heat exchanger. Heat pump system leave out the cross valve, the operation of defrosting does not need the mode conversion, has improved heat pump system's life, and can the energy saving with improve indoor comfort level.
Description
Technical Field
The utility model relates to a drying-machine field especially relates to an air source heat pump system and air source heat pump system's control method.
Background
When the heat pump system heats in a low-temperature environment, the outdoor heat exchanger of the heat pump system needs to absorb heat from outdoor air. However, when the surface temperature of the outdoor heat exchanger is lower than the outdoor air temperature, the surface of the outdoor heat exchanger will frost, and the frost layer affects the heat exchange area of the outdoor heat exchanger and the air flow rate, and further affects the heating effect of the heat pump system.
In this case, in order to avoid continuous influence of frost formation on the operation of the outdoor heat exchanger, the outdoor heat exchanger needs to be subjected to a defrosting operation. In the prior art, the common defrosting mode is as follows: the heat pump system is switched from the heating cycle to the refrigerating cycle through the four-way valve, so that the outdoor heat exchanger can be used as a condenser to utilize a high-temperature refrigerant thereof to carry out defrosting operation.
However, the above defrosting operation includes at least the following drawbacks:
(1) a heat pump system is switched from a heating cycle to a refrigerating cycle by a four-way valve;
(2) under the conditions that the environment temperature is low and the compressor is in high-compression-ratio operation, the heating cycle is switched to the refrigerating cycle, the pressure impact damage to a heat pump system is large, and the service life of the compressor and the service life of a four-way valve are influenced;
(3) the defrosting process comprises the following steps: the heat supply hot water is firstly cooled, the heating is carried out after defrosting is finished, the water temperature is increased, the operation mode of cooling and heating is realized, the idle work of the heat pump system is undoubtedly realized, the indoor comfort degree is influenced, and the electric energy is wasted.
It should be noted that the above-mentioned contents are not used to limit the protection scope of the utility model.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an air source heat pump system for solve the following problem that the defrosting operation causes among the prior art: the four-way valve is required; the pressure impact damage to the heat pump system is large, and the service life of the compressor is influenced; wasting electric energy and influencing indoor comfort.
An aspect of the utility model provides an air source heat pump system, including the compressor, still include:
one end of the heating circuit is communicated with an outlet of the compressor, and the other end of the heating circuit is communicated with an inlet of the compressor; the heating circuit comprises an indoor heat exchanger, a heating liquid supply pipeline and an air suction pipeline which are connected in series; the heating liquid supply pipeline comprises a plurality of liquid supply bypasses, and each liquid supply bypass is used for being communicated with a corresponding outdoor heat exchanger; the air suction pipeline comprises a plurality of air suction bypasses, and each air suction bypass is used for being communicated with the corresponding outdoor heat exchanger through the corresponding defrosting valve;
one end of the defrosting pipeline is communicated with an outlet of the compressor; the defrosting pipeline comprises a plurality of defrosting bypasses, and each defrosting bypass is communicated with the corresponding outdoor heat exchanger through the corresponding defrosting valve and is communicated with the heating liquid supply pipeline through the corresponding outdoor heat exchanger.
Optionally, the plurality of liquid supply bypasses includes at least a first liquid supply bypass and a second liquid supply bypass; the first liquid supply bypass is communicated with a heat exchanger inlet of the first outdoor heat exchanger, and the second liquid supply bypass is communicated with a heat exchanger inlet of the second outdoor heat exchanger.
Optionally, the air suction pipeline comprises at least a first air suction bypass and a second air suction bypass; the first air suction bypass is communicated with a heat exchanger outlet of the first outdoor heat exchanger through a first defrosting valve, and the second air suction bypass is communicated with a heat exchanger outlet of the second outdoor heat exchanger through a second defrosting valve; the first defrosting valve is used for controlling connection and disconnection between the first outdoor heat exchanger and the air suction pipeline, and the second defrosting valve is used for controlling connection and disconnection between the second outdoor heat exchanger and the air suction pipeline.
Optionally, the defrosting pipeline includes at least a first defrosting bypass and a second defrosting bypass; the first defrosting bypass is communicated with the heat exchanger outlet of the first outdoor heat exchanger through the first defrosting valve, and the second defrosting bypass is communicated with the heat exchanger outlet of the second outdoor heat exchanger through the second defrosting valve; the first defrosting valve is further used for controlling connection and disconnection between the first outdoor heat exchanger and the defrosting pipeline, and the second defrosting valve is further used for controlling connection and disconnection between the second outdoor heat exchanger and the defrosting pipeline.
Optionally, the device further comprises a first check valve and a second check valve; high-temperature and high-pressure gas provided by the compressor enters the defrosting pipeline, and under the control of the first defrosting valve, the high-temperature and high-pressure gas sequentially passes through the first defrosting bypass, the first defrosting valve, the heat exchanger outlet of the first outdoor heat exchanger, the heat exchanger inlet of the first outdoor heat exchanger and the first check valve and enters the heating liquid supply pipeline; or under the control of the second defrosting valve, the high-temperature and high-pressure gas sequentially passes through the second defrosting bypass, the second defrosting valve, the heat exchange outlet of the second outdoor heat exchanger, the heat exchanger inlet of the second outdoor heat exchanger and the second one-way valve and enters the heating liquid supply pipeline.
Optionally, a four-way valve is not included.
Optionally, each outdoor heat exchanger is a V-shaped fin heat exchanger.
Optionally, the indoor heat exchanger comprises a shell and tube heat exchanger.
The utility model also provides a control method of the air source heat pump system, the air source heat pump system comprises a compressor, a heating liquid supply pipeline, an air suction pipeline and a defrosting pipeline, and a circulation loop is formed among the compressor, the heating liquid supply pipeline and the air suction pipeline; the heating liquid supply pipeline comprises a plurality of liquid supply bypasses, the defrosting pipeline comprises a plurality of defrosting bypasses, and every N liquid supply bypasses and every N defrosting bypasses correspondingly serve one outdoor heat exchanger, and the method comprises the following steps:
in the heating mode: controlling each liquid supply bypass of the plurality of liquid supply bypasses to be in a communicated state with the air suction pipeline, and each defrosting bypass of the plurality of defrosting bypasses to be in a disconnected state with the corresponding outdoor heat exchanger;
detecting whether each outdoor heat exchanger reaches a defrosting condition;
if one of the outdoor heat exchangers is detected to reach the defrosting condition, the following operations are carried out:
disconnecting the N feed liquid bypasses associated with this outdoor heat exchanger from the suction line;
n defrosting bypasses which are associated with the outdoor heat exchanger are communicated with the outdoor heat exchanger, and high-temperature and high-pressure gas provided by the compressor is conveyed to the outdoor heat exchanger through the N defrosting bypasses which are associated with the outdoor heat exchanger for defrosting operation.
Optionally, the method further includes: and if other outdoor heat exchangers reach the defrosting condition, the at least part of other outdoor heat exchangers enter a defrosting waiting state until the defrosting of the outdoor heat exchanger is finished, so that only M outdoor heat exchangers are in the defrosting state in the same time period.
The utility model provides an air source heat pump system and air source heat pump system's control method, when certain outdoor heat exchanger will defrost, no longer need convert heat pump system into the mode of refrigerating by heating the mode, and when maintaining other outdoor heat exchangers and continuing to heat, supply the liquid bypass that corresponds this outdoor heat exchanger through corresponding defrosting valve and inhale the bypass and break off, in order to stop this outdoor heat exchanger's function, and communicate this outdoor heat exchanger and corresponding defrosting bypass through this corresponding defrosting valve, receive the high temperature high-pressure gas that comes from the compressor through this corresponding defrosting bypass, the high temperature high-pressure gas who receives carries out the defrosting operation through the high temperature high-pressure gas who receives. It is not difficult to understand, the utility model provides a defrosting operation need not be with the help of the cross valve, also need not turn to refrigeration cycle with heat pump system by heating the circulation, has avoided because the mode conversion between heating circulation and the refrigeration cycle promotes the compressor life-span to heat pump system's damage.
In addition, the influence of the heat pump system on the reduction of heating water temperature under the condition that the traditional mode is converted from the heating mode to the cooling mode is solved, the phenomenon that the heating water temperature is reduced when the heat pump system is defrosted is avoided, and therefore the electric energy is saved and the indoor comfort level is improved.
Drawings
Fig. 1 schematically illustrates a structural schematic diagram of an air source heat pump system according to an embodiment of the present invention;
fig. 2 schematically illustrates a defrosting flow path direction of an air source heat pump system according to an embodiment of the present invention in a certain defrosting operation; and
fig. 3 is a schematic flow chart illustrating a control method of an air source heat pump system according to an embodiment of the present invention.
In fig. 1 and 2: a compressor 1; an indoor heat exchanger 2; expansion valves (3A _1, 3A _2, 3B _1, 3B _2, 3C _1, 3C _2, 3D _1, 3D _ 2); one-way valves (4A _1, 4A _2, 4B _1, 4B _2, 4C _1, 4C _2, 4D _1, 4D _ 2); outdoor heat exchangers (5A, 5B, 5C, 5D); cooling fans (6A, 6B, 6C, 6D); defrosting valves (7A _1, 7A _2, 7B _1, 7B _2, 7C _1, 7C _2, 7D _1, 7D _ 2); a gas-liquid separator 8; a defrosting pipeline 9; a defrosting bypass (9A _1, 9A _2, 9B _1, 9B _2, 9C _1, 9C _2, 9D _1, 9D _ 2); a heating exhaust main line 10; a drying filter 11; a heating liquid supply pipeline 12; a liquid supply bypass (12A _1, 12A _2, 12B _1, 12B _2, 12C _1, 12C _2, 12D _1, 12D _ 2); an aspiration line 13.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Example one
Fig. 1 schematically shows a structural principle diagram of an air source heat pump system according to the present invention.
An air source heat pump system comprises a compressor 1, a heating circuit and a defrosting circuit 9.
One end of the heating circuit is communicated with an outlet of the compressor 1, and the other end of the heating circuit is communicated with an inlet of the compressor 1; the heating circuit comprises an indoor heat exchanger 2, a heating liquid supply pipeline 12 and an air suction pipeline 13 which are connected in series; the heating liquid supply pipeline 12 comprises a plurality of liquid supply bypasses, and each liquid supply bypass is used for being communicated with a corresponding outdoor heat exchanger; the suction line 13 includes a plurality of suction bypasses each for communicating with a corresponding outdoor heat exchanger through a corresponding defrost valve.
A defrosting pipeline 9, wherein one end of the defrosting pipeline is communicated with an outlet of the compressor 1; the defrosting pipeline 9 comprises a plurality of defrosting bypasses, and each defrosting bypass is communicated with a corresponding outdoor heat exchanger through a corresponding defrosting valve and is communicated with the heating liquid supply pipeline 12 through the corresponding outdoor heat exchanger.
In an exemplary embodiment, the plurality of feed liquid bypasses are used in association with 4 to 8 outdoor heat exchangers. In practical application, the number of the outdoor heat exchangers can be selected and combined correspondingly according to the heating capacity of the system.
In an exemplary embodiment, the plurality of liquid supply bypasses includes at least a first liquid supply bypass (e.g., 12A _1) and a second liquid supply bypass (e.g., 12B _ 1). Wherein the first liquid supply bypass 12A _1 is used for communicating with the heat exchanger inlet of the first outdoor heat exchanger 5A, and the second liquid supply bypass 12A _1 is used for communicating with the heat exchanger inlet of the second outdoor heat exchanger 5B.
In an exemplary embodiment, the suction line includes at least a first suction bypass and a second suction bypass. Wherein the first suction bypass communicates with a heat exchanger outlet of the first outdoor heat exchanger 5A through a first defrost valve (e.g., 7A _1), and the second suction bypass communicates with a heat exchanger outlet of the second outdoor heat exchanger 5B through a second defrost valve (e.g., 7B _ 1); the first defrost valve 7A _1 may be used to control communication and disconnection between the first outdoor heat exchanger 5A and the suction line 13, and the second defrost valve 7B _1 may be used to control communication and disconnection between the second outdoor heat exchanger 5B and the suction line 13.
In an exemplary embodiment, the defrost line 9 includes at least a first defrost bypass (e.g., 9A _1) and a second defrost bypass (e.g., 9B _ 1); wherein the first defrosting bypass 9A _1 is communicated with the heat exchanger outlet of the first outdoor heat exchanger 5A through a first defrosting valve 7A _1, and the second defrosting bypass 9B _1 is communicated with the heat exchanger outlet of the second outdoor heat exchanger 5B through a second defrosting valve 7B _ 1; the first defrosting valve 7A _1 can also be used for controlling the connection and disconnection between the first outdoor heat exchanger 5A and the defrosting pipeline 9, and the second defrosting valve 7B _1 can also be used for controlling the connection and disconnection between the second outdoor heat exchanger 5B and the defrosting pipeline 9.
In an exemplary embodiment, the heat pump system further includes a first check valve (e.g., 4A _1) and a second check valve (e.g., 4B _ 1). The high-temperature and high-pressure gas provided by the compressor 1 enters the defrosting pipeline 9, and under the control of the first defrosting valve 7A _1, the high-temperature and high-pressure gas sequentially passes through the first defrosting bypass 9A _1, the first defrosting valve 7A _1, the heat exchanger outlet of the first outdoor heat exchanger 5A, the heat exchanger inlet of the first outdoor heat exchanger 5A and the first check valve 4A _1 and enters the heating liquid supply pipeline 12; or under the control of the second defrosting valve 7B _1, the high-temperature and high-pressure gas sequentially passes through the second defrosting bypass 9B _1, the second defrosting valve 7B _1, the heat exchange outlet of the second outdoor heat exchanger 5B, the heat exchanger inlet of the second outdoor heat exchanger 5B, and the second check valve 4B _1 and enters the heating liquid supply pipeline 12.
In an exemplary embodiment, each outdoor heat exchanger may be a V-fin heat exchanger.
In an exemplary embodiment, the indoor heat exchanger may be a shell and tube heat exchanger.
In an exemplary embodiment, the air-source heat pump system does not include a four-way valve, and each defrost valve may be a three-way valve.
For ease of understanding of the present invention, an air source heat pump system comprising 4 outdoor heat exchangers is provided below, with continued reference to fig. 1: an air source heat pump system may include a compressor 1, a heating circuit (not identified), a defrost line 9.
One end of the heating circuit is communicated with an outlet of the compressor 1, and the other end of the heating circuit is communicated with an inlet of the compressor 1. The heating circuit may be composed of the following components connected in series in sequence: a heating exhaust main pipeline 10, an indoor heat exchanger 2, a drying filter 11, a heating liquid supply pipeline 12, an air suction pipeline 13 and a gas-liquid separator 8. Among them, a plurality of outdoor heat exchangers are provided between the heating liquid supply line 12 and the suction line 13. The heating liquid supply pipeline 12 comprises a plurality of liquid supply bypasses, such as: 12A _1, 12A _2, 12B _1, 12B _2, 12C _1, 12C _2, 12D _1, 12D _ 2. Each feed liquid bypass is used for communicating with a corresponding outdoor heat exchanger, such as: the liquid supply bypasses 12A _1 and 12A _2 are used for communicating with the outdoor heat exchanger 5A, and the liquid supply bypasses 12B _1 and 12B _2 are used for communicating with the outdoor heat exchanger 5B. The aspiration line 13 includes a plurality of aspiration bypasses (not shown). Each suction bypass is for communication with the corresponding outdoor heat exchanger through the corresponding defrost valve, i.e., each suction bypass may correspond to one defrost valve, such as the suction bypass corresponding to the defrost valve 7A _1 and the outdoor heat exchanger 5A, the suction bypass corresponding to the defrost valve 7A _2 and the outdoor heat exchanger 5A, the suction bypass corresponding to the defrost valve 7B _2 and the outdoor heat exchanger 5B, ….
A defrosting pipeline 9, wherein one end of the defrosting pipeline is communicated with the outlet of the compressor 1, and the other end of the defrosting pipeline can be a closed end or can be used as a defrosting bypass; the defrosting pipe 9 includes a plurality of defrosting bypasses, such as: 9A _1, 9A _2, 9B _1, 9B _2, 9C _1, 9C _2, 9D _1, 9D _ 2. Each defrosting bypass is communicated with the corresponding outdoor heat exchanger through the corresponding defrosting valve and is communicated with the heating liquid supply pipeline 12 through the corresponding outdoor heat exchanger. For example, the defrosting bypass 9A _1 may communicate with the outdoor heat exchanger 5A through the defrosting valve 7A _1 and with the heating liquid supply line 12 through the outdoor heat exchanger 5A.
The normal heating operation process of the heat pump system comprises the following steps: the compressor 1 → a main heating and air discharging pipeline 10 → an indoor heat exchanger 2 → a filter drier 11 → a liquid heating and supplying pipeline 12 → an expansion valve (3A _1, 3A _2, 3B _1, 3B _2, 3C _1, 3C _2, 3D _1, 3D _2) → an outdoor heat exchanger (5A, 5B, 5C, 5D) → a defrost valve (7A _1, 7A _2, 7B _1, 7B _2, 7C _1, 7C _2, 7D _1, 7D _2) → an air suction pipeline 13 → a gas-liquid separator 8 → a compressor 1 → …. The heating liquid supply pipeline 12 is used for conveying liquid out through each liquid supply bypass, and specifically comprises the following steps: liquid in the liquid supply bypass 12A _1 sequentially passes through the expansion valve 3A _1, the outdoor heat exchanger 5A and the defrosting valve 7A _1 and then enters the suction pipeline 13; liquid in the liquid supply bypass 12A _2 sequentially passes through the expansion valve 3A _2, the outdoor heat exchanger 5A and the defrosting valve 7A _2 and then enters the suction pipeline 13; the liquid in the liquid supply bypass 12B _1 sequentially passes through the expansion valve 3B _1, the outdoor heat exchanger 5B and the defrosting valve 7B _1 and then enters the suction pipeline 13, which is not described herein again.
If it is detected that a certain outdoor heat exchanger (e.g., 5C) is frosted, the heat pump system performs the following operations: the heating circuit continues to maintain the operating state, the liquid supply bypasses 12A _1, 12A _2, 12B _1, 12B _2, 12D _1, 12D _2 and the suction line 13 continue to maintain the communicating state, and in addition: the liquid supply bypass 12C _1 and the suction line 13 are disconnected and the liquid supply bypass 12C _2 and the suction line 13 are disconnected by the defrosting valves 7C _1, and the defrosting bypass 9C _1 and the outdoor heat exchanger 5C are communicated and the defrosting bypass 9C _2 and the outdoor heat exchanger 5C are communicated. It can be easily understood that the outdoor heat exchangers 5A, 5B, and 5D continue to maintain the normal heating state, and only the outdoor heat exchanger 5C is defrosted, as shown in fig. 2, wherein the inner dotted line represents the high-temperature high-pressure gas flow path. The main defrosting process comprises the following steps: compressor 1 → defrosting pipe 9 → defrosting valve (7C _1, 7C _2) → outdoor heat exchanger 5C → check valve (4C _1, 4C _2) → heating and liquid-supplying pipe 12; in addition, the cooling fan 6C stops operating. Compressor 1 provides high temperature high pressure gas for defrosting pipeline 9, and defrosting pipeline 9 is through defrosting bypass 9C _1 and 9C _2 with high temperature high pressure gas transmits away, and is specific: the defrosting bypass 9C _1 enables high-temperature and high-pressure gas to sequentially pass through the defrosting valve 7C _1, the outdoor heat exchanger 5C and the check valve 4C _1 and then enter the heating liquid supply pipeline 12; the defrosting bypass 9C _2 enables the high-temperature and high-pressure gas to sequentially pass through the defrosting valve 7C _2, the outdoor heat exchanger 5C and the check valve 4C _2 and then enter the heating liquid supply pipeline 12.
According to the heat pump system, the four-way valve is not needed any more in defrosting operation of the heat pump system, namely the heat pump system does not comprise the four-way valve; the heat pump system is not required to be switched from the heating mode to the cooling mode any more, while the outdoor heat exchangers 5A, 5B and 5D continue to heat, the liquid supply bypasses 12C _1 and 12C _2 and the air suction bypasses corresponding to the outdoor heat exchanger 5C are disconnected through the defrosting valves 7C _1 and 7C _2 to stop the operation of the outdoor heat exchanger 5C, the outdoor heat exchanger 5C and the defrosting bypasses 9C _1 and 9C _2 are communicated through the defrosting valves 12C _1 and 12C _2, the high-temperature and high-pressure gas from the compressor 1 is received through the defrosting bypasses 9C _1 and 9C _2, and the defrosting operation is performed through the received high-temperature and high-pressure gas. Because the defrosting operation does not need to transfer the heat pump system from the heating cycle to the refrigerating cycle, the damage to the heat pump system caused by mode conversion between the heating cycle and the refrigerating cycle is avoided, and the service lives of the heat pump system and each part are prolonged.
It is not difficult to understand that:
(1) in the embodiment, a refrigerant switching four-way valve used for defrosting is eliminated, and a plurality of groups (4-8 groups or more, and the groups are combined according to systems with different capacities) of independent outdoor heat exchangers, such as V-shaped fin heat exchangers, can be established;
(2) in the embodiment, a main system for operating the heat pump system is not changed, and the heat pump system is always in a heating state;
(3) the present embodiment can detect whether there is a frosting phenomenon on each outdoor heat exchanger through the defrosting sensor that is located on each outdoor heat exchanger, for example: when the outdoor heat exchanger 5A reaches a defrosting condition, the cooling fan 6A of the outdoor heat exchanger 5A stops operating, and the defrosting valves 7A _1 and 7A _2 perform switching, so that high-temperature and high-pressure gas (such as gaseous refrigerant) output by the compressor 1 directly enters the outdoor heat exchanger 5A to be quickly defrosted, and the other outdoor heat exchangers 5B, 5C and 5D continue to operate to heat.
In order to ensure that the heating capacity is enough under the heat pump line, when other outdoor heat exchangers (such as 5B) also reach the defrosting condition, the other outdoor heat exchangers (such as 5B) are controlled to continue heating and enter a defrosting waiting state, the outdoor heat exchanger 5A recovers heating until the outdoor heat exchanger 5A is completely defrosted, and the other outdoor heat exchangers (such as 5B) carry out defrosting operation to ensure that only M outdoor heat exchangers are in the defrosting state in the same time period, wherein M is an integer larger than or equal to 1, and M is preferably 1.
(4) The defrosting after the heat pump system operates in winter and frosts is solved in the embodiment, and the problem brought by switching the refrigerant system by the four-way valve is solved: such as damage caused by pressure impact of various valves due to switching under a high compression ratio, oil shortage operation of the compressor, and damage caused by liquid compression operation of the compressor. It can be seen that the present embodiment significantly improves the operational life of the heat pump system.
(5) In the prior art: under low ambient temperature, high-pressure system pressure is difficult to establish, leads to the incomplete frost removal, reduces heat pump system heating efficiency and energy efficiency ratio, wastes the electric energy. In order to solve the problem, the embodiment always uses high-temperature and high-pressure gas in the defrosting process, so that the defrosting speed and the defrosting efficiency are improved; in addition, the heat pump system is provided with the plurality of independent V-shaped fin heat exchangers, defrosting is carried out step by step under high pressure, defrosting time is shortened, defrosting is more thorough, heat exchange efficiency of the heat pump system is improved, energy efficiency ratio of the heat pump system is improved, and electric energy resources are saved.
(6) The influence of the heat pump system on the reduction of the heating water temperature under the condition of 'heating → refrigerating' switching defrosting is solved. The operation of the mode avoids the phenomenon that the temperature of the heating water is reduced when the heat pump system is defrosted, thereby saving the utilization effect of the electric energy.
(7) Meanwhile, in the system configuration, the indoor heat exchanger can adopt a shell type condenser (hot water condenser), so that the bearing pressure of the heat pump system is higher, the water temperature of the heat pump system can be increased, and high-grade hot water can be better provided for heating and the like.
Example two
Fig. 3 schematically shows a flow chart of a control method of an air source heat pump system according to the present invention.
The air source heat pump system comprises a compressor, a heating liquid supply pipeline, an air suction pipeline and a defrosting pipeline, wherein a circulating loop is formed among the compressor, the heating liquid supply pipeline and the air suction pipeline; the heating liquid supply pipeline comprises a plurality of liquid supply bypasses, the defrosting pipeline comprises a plurality of defrosting bypasses, and every N liquid supply bypasses and every N defrosting bypasses correspondingly serve one outdoor heat exchanger.
The control method of the air source heat pump system comprises the following steps:
s1: in the heating mode: and controlling each liquid supply bypass in the plurality of liquid supply bypasses to be in a communicated state with the air suction pipeline, and controlling each defrosting bypass in the plurality of defrosting bypasses to be in a disconnected state with the corresponding outdoor heat exchanger.
S2: and detecting whether each outdoor heat exchanger reaches a defrosting condition.
S3: if one of the outdoor heat exchangers is detected to reach the defrosting condition, the following operations are carried out:
disconnecting the suction line from N feed liquid bypasses (N is an integer greater than or equal to 1, for example, 2 feed liquid bypasses are associated with each outdoor heat exchanger in the heat pump system shown in FIG. 1);
n defrosting bypasses which are associated with the outdoor heat exchanger are communicated with the outdoor heat exchanger, and high-temperature and high-pressure gas provided by the compressor is conveyed to the outdoor heat exchanger through the N defrosting bypasses which are associated with the outdoor heat exchanger for defrosting operation.
In an exemplary embodiment, the control method of the air source heat pump system includes the following steps S4:
and if other outdoor heat exchangers reach the defrosting condition, the at least part of other outdoor heat exchangers enter a defrosting waiting state until the defrosting of the outdoor heat exchanger is finished, so that only M outdoor heat exchangers are in the defrosting state in the same time period. M is an integer of 1 or more, and M is preferably 1.
The above is only the preferred embodiment of the present invention, and not the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (8)
1. An air source heat pump system comprising a compressor, and further comprising:
one end of the heating circuit is communicated with an outlet of the compressor, and the other end of the heating circuit is communicated with an inlet of the compressor; the heating circuit comprises an indoor heat exchanger, a heating liquid supply pipeline and an air suction pipeline which are connected in series; the heating liquid supply pipeline comprises a plurality of liquid supply bypasses, and each liquid supply bypass is used for being communicated with a corresponding outdoor heat exchanger; the air suction pipeline comprises a plurality of air suction bypasses, and each air suction bypass is used for being communicated with the corresponding outdoor heat exchanger through the corresponding defrosting valve;
one end of the defrosting pipeline is communicated with an outlet of the compressor; the defrosting pipeline comprises a plurality of defrosting bypasses, and each defrosting bypass is communicated with the corresponding outdoor heat exchanger through the corresponding defrosting valve and is communicated with the heating liquid supply pipeline through the corresponding outdoor heat exchanger.
2. The air-source heat pump system of claim 1, wherein:
the plurality of liquid supply bypasses includes at least a first liquid supply bypass and a second liquid supply bypass;
the first liquid supply bypass is communicated with a heat exchanger inlet of the first outdoor heat exchanger, and the second liquid supply bypass is communicated with a heat exchanger inlet of the second outdoor heat exchanger.
3. The air-source heat pump system of claim 2, wherein:
the air suction pipeline at least comprises a first air suction bypass and a second air suction bypass;
the first air suction bypass is communicated with a heat exchanger outlet of the first outdoor heat exchanger through a first defrosting valve, and the second air suction bypass is communicated with a heat exchanger outlet of the second outdoor heat exchanger through a second defrosting valve;
the first defrosting valve is used for controlling connection and disconnection between the first outdoor heat exchanger and the air suction pipeline, and the second defrosting valve is used for controlling connection and disconnection between the second outdoor heat exchanger and the air suction pipeline.
4. The air source heat pump system of claim 3, wherein:
the defrosting pipeline comprises at least a first defrosting bypass and a second defrosting bypass;
the first defrosting bypass is communicated with the heat exchanger outlet of the first outdoor heat exchanger through the first defrosting valve, and the second defrosting bypass is communicated with the heat exchanger outlet of the second outdoor heat exchanger through the second defrosting valve;
the first defrosting valve is further used for controlling connection and disconnection between the first outdoor heat exchanger and the defrosting pipeline, and the second defrosting valve is further used for controlling connection and disconnection between the second outdoor heat exchanger and the defrosting pipeline.
5. The air source heat pump system of claim 4, wherein:
the device also comprises a first one-way valve and a second one-way valve;
high-temperature and high-pressure gas provided by the compressor enters the defrosting pipeline, and under the control of the first defrosting valve, the high-temperature and high-pressure gas sequentially passes through the first defrosting bypass, the first defrosting valve, the heat exchanger outlet of the first outdoor heat exchanger, the heat exchanger inlet of the first outdoor heat exchanger and the first check valve and enters the heating liquid supply pipeline; or under the control of the second defrosting valve, the high-temperature and high-pressure gas sequentially passes through the second defrosting bypass, the second defrosting valve, the heat exchange outlet of the second outdoor heat exchanger, the heat exchanger inlet of the second outdoor heat exchanger and the second one-way valve and enters the heating liquid supply pipeline.
6. The air source heat pump system according to any one of claims 1 to 5, wherein: a four-way valve is not included.
7. The air source heat pump system according to any one of claims 1 to 5, wherein: each outdoor heat exchanger is a V-shaped fin heat exchanger.
8. The air source heat pump system according to any one of claims 1 to 5, wherein: the indoor heat exchanger comprises a shell and tube heat exchanger.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111271906A (en) * | 2020-03-18 | 2020-06-12 | 广东欧亚制冷设备制造有限公司 | Air source heat pump system and control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111271906A (en) * | 2020-03-18 | 2020-06-12 | 广东欧亚制冷设备制造有限公司 | Air source heat pump system and control method |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Air source heat pump system Effective date of registration: 20230613 Granted publication date: 20201106 Pledgee: Qingyuan Branch of Postal Savings Bank of China Co.,Ltd. Pledgor: EURASIAN (GUANGDONG) FREEZING EQUIPMENT CO.,LTD. Registration number: Y2023980043780 |