CN110986659A - Descaling control method based on pulsating water flow and water chilling unit - Google Patents
Descaling control method based on pulsating water flow and water chilling unit Download PDFInfo
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- CN110986659A CN110986659A CN201911286160.6A CN201911286160A CN110986659A CN 110986659 A CN110986659 A CN 110986659A CN 201911286160 A CN201911286160 A CN 201911286160A CN 110986659 A CN110986659 A CN 110986659A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 150
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000001704 evaporation Methods 0.000 claims description 73
- 230000008020 evaporation Effects 0.000 claims description 72
- 238000011010 flushing procedure Methods 0.000 claims description 16
- 230000008859 change Effects 0.000 claims description 4
- 238000004590 computer program Methods 0.000 claims description 3
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 239000000498 cooling water Substances 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 17
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 239000011552 falling film Substances 0.000 description 2
- 238000010977 unit operation Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G15/00—Details
- F28G15/003—Control arrangements
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- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a descaling control method based on pulsating water flow and a water chilling unit. Wherein, this cooling water set includes the evaporimeter and with the refrigerated water outlet pipe way that the evaporimeter is connected still includes: and the descaling branch is connected with the chilled water outlet pipeline in parallel and used for inputting pulsating water flow to the evaporator by utilizing the chilled water outlet under the opening state of the branch, wherein the pulsating water flow reciprocates in the evaporator and the descaling branch. According to the invention, the descaling branch and the chilled water outlet are utilized to input pulsating water flow to the evaporator, and through the impact force of the repeated pulse of the pulsating water flow in the flow path, scale on the inner wall of the evaporator can be removed when the unit operates, the unit does not need to be disassembled, the descaling cost is reduced, the reliability and the service life of the unit are not influenced, meanwhile, the unit is descaled during operation, the machine does not need to be shut down, the normal use of the unit is not influenced, and the descaling mode meets the requirements of energy conservation and emission reduction.
Description
Technical Field
The invention relates to the technical field of units, in particular to a descaling control method based on pulsating water flow and a water chilling unit.
Background
At present, the market share proportion of the commercial water machine is higher and higher, and the defects of the water machine are also paid more and more attention. Currently, the mainstream shell-and-tube evaporators mainly comprise a dry shell-and-tube, a flooded shell-and-tube, a falling film shell-and-tube and the like, and the falling film shell-and-tube has extremely high installation requirements and low energy efficiency of the dry shell-and-tube, so that the evaporator mainly adopted in the unit is the flooded shell-and-tube evaporator. But the higher flooded shell and tube evaporator of stability can produce the incrustation scale because of the characteristic that water and air combine in the operation process to influence evaporimeter heat transfer performance, the heat transfer effect of evaporimeter can very big degree reduce, also can reduce unit life and reliability simultaneously, probably leads to the shell and tube to split even, the refrigerant leaks the scheduling problem.
At present, the method for solving the scale generated by the unit shell-tube evaporator mainly comprises the steps of disassembling a shell tube and manually brushing a brush to remove the scale. For the air-cooled screw water chilling unit with a large volume, in order to ensure the reliable operation of the unit, after the unit is completely installed, the unit is basically difficult to move again or disassemble a shell and tube for cleaning. In this case, if the shell and tube evaporator generates scale, the maintenance cost is greatly increased, and the reliability of the unit is affected.
Aiming at the problems that in the prior art, the evaporator needs to be disassembled for descaling, the cost is high and the unit operation is influenced, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a descaling control method based on pulsating water flow and a water chilling unit, and aims to solve the problems that in the prior art, an evaporator needs to be disassembled for descaling, the cost is high, and the operation of the unit is influenced.
In order to solve the above technical problem, an embodiment of the present invention provides a water chilling unit, including an evaporator and a chilled water outlet pipeline connected to the evaporator, further including: and the descaling branch is connected with the chilled water outlet pipeline in parallel and used for inputting pulsating water flow to the evaporator by utilizing the chilled water outlet under the opening state of the branch, wherein the pulsating water flow reciprocates in the evaporator and the descaling branch.
Optionally, the descaling branch comprises: the back flushing one-way valve is periodically opened and closed according to the change of the water flow speed at the inlet of the back flushing one-way valve, and generates a force opposite to the water inlet direction when the back flushing one-way valve is closed so as to form the pulse water flow.
Optionally, the descaling branch further includes: and the first electromagnetic valve is positioned between the chilled water outlet of the evaporator and the back flushing one-way valve and is used for controlling the opening and closing of the descaling branch.
Optionally, the descaling branch further includes: a second solenoid valve connected to an outlet of the backwash check valve.
The embodiment of the invention also provides a descaling control method based on pulsating water flow, which is applied to the water chilling unit and comprises the following steps: acquiring designated operation parameters of the unit; judging whether the evaporator meets a descaling condition or not according to the specified operation parameters; if so, starting the descaling branch to input pulsating water flow to the evaporator by utilizing the outlet water of the chilled water.
Optionally, judging whether the evaporator meets the descaling condition according to the specified operation parameters includes: judging whether the operation load of the compressor meets a first preset condition or not, and judging whether evaporation parameters meet a second preset condition or not, wherein the evaporation parameters comprise evaporation pressure and/or evaporation temperature; and if both are met, determining that the evaporator meets the descaling condition.
Optionally, judging whether the operating load of the compressor meets a first preset condition includes: comparing the operating load of the compressor with a first preset threshold value; and if the compressor running load is greater than or equal to the first preset threshold, determining that the compressor running load meets the first preset condition.
Optionally, the second preset condition includes a preset pressure condition; judging whether the evaporation parameters meet a second preset condition or not, wherein the judgment comprises the following steps: comparing the evaporation pressure with a second preset threshold value; and if the evaporation pressure is smaller than or equal to the second preset threshold, determining that the evaporation pressure meets the preset pressure condition.
Optionally, the second preset condition includes a preset temperature condition; judging whether the evaporation parameters meet a second preset condition or not, wherein the judgment comprises the following steps: calculating the product of the evaporation temperature and the running load of the compressor to obtain a reference temperature; comparing the outlet water temperature of the chilled water with the reference temperature; and if the temperature of the outlet water of the chilled water is greater than the reference temperature, determining that the evaporation temperature meets the preset temperature condition.
Optionally, after the descaling branch is opened, the method further includes: detecting whether the starting time of the descaling branch reaches a preset time length or not; if yes, the descaling branch is closed.
Embodiments of the present invention also provide a computer-readable storage medium, on which a computer program is stored, which when executed by a processor, implements the above descaling control method based on pulsating water flow.
By applying the technical scheme of the invention, the descaling branch and the chilled water outlet are utilized, the pulsating water flow is input into the evaporator, and the scale on the inner wall of the evaporator can be removed when the unit operates by the impact force of the repeated pulse of the pulsating water flow in the flow path, so that the unit does not need to be disassembled, the descaling cost is reduced, the reliability and the service life of the unit are not influenced, meanwhile, the descaling is carried out when the unit operates, the machine does not need to be shut down, the normal use of the unit is not influenced, and the descaling mode meets the requirements of energy conservation and emission reduction. And, simple structure, simple to operate, the operation requires lowly.
Drawings
Fig. 1 is a schematic structural diagram of a water chilling unit according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of an air-cooled screw water chiller according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for controlling descaling based on pulsating water flow according to a second embodiment of the present invention;
fig. 4 is a block diagram of a descaling control device based on pulsating water flow according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. 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.
Example one
The embodiment provides a water chilling unit, need not to dismantle and to carry out the scale removal to the evaporimeter.
Referring to fig. 1, a water chiller includes: the device comprises an evaporator 10, a chilled water outlet pipeline 20 connected with the evaporator 10, and a descaling branch 30. The evaporator is provided with a chilled water inlet A and a chilled water outlet B. Figure 1 does not show other components in the assembly.
And the descaling branch 30 is connected in parallel with the chilled water outlet pipeline 20 and is used for inputting pulsating water flow to the evaporator 10 by using the chilled water outlet when the branch is opened, wherein the pulsating water flow reciprocates in the evaporator 10 and the descaling branch 30.
The pulsating water flow is water wave in a pulsating mode, and the fluidity and the direction of the water wave are periodically changed. The descaling branch is used for generating reciprocating impact pulsating water flow, and the energy of the water wave buffered back and forth is used for removing scale. After the descaling branch is opened, the chilled water outlet water simultaneously enters the chilled water outlet pipeline and the descaling branch, and the normal operation of the unit is not influenced. The flushed scale can be discharged from the water outlet pipeline along with the chilled water.
The water chilling unit of this embodiment utilizes scale removal branch road and refrigerated water to go out water, inputs pulsating water flow to the evaporimeter, through the impact force of pulsating water flow repetition pulse in the flow path, can get rid of the incrustation scale of evaporimeter inner wall when the unit moves, need not to disassemble the unit, reduces the scale removal cost and does not influence unit reliability and life, and the while is descaling in the unit operation, need not to shut down, can not influence the normal use of unit, and the scale removal mode accords with energy saving and emission reduction's requirement. And, simple structure, simple to operate, the operation requires lowly.
In an alternative embodiment, the descaling branch 30 comprises: the backflushing one-way valve 31 is periodically opened and closed according to the change of the water flow rate at the inlet C of the backflushing one-way valve, and generates a force opposite to the water inlet direction when the backflushing one-way valve is closed so as to form pulse water flow. Wherein the water inlet direction refers to the direction from the inlet C to the outlet D of the back flushing one-way valve.
The inside spring that is provided with the target plate and is connected with the target plate that recoils check valve, the target plate is used for preventing the fluid backward flow, and the spring is used for increasing the dynamics of opening and shutting of target plate. When the flow rate of the fluid reaches a certain value, the force of the fluid on the target plate is greater than the force of the spring on the target plate, the fluid rushes off the target plate, the recoil check valve is opened, and the fluid circulates; when the fluid flow rate is lower than the value, the back flushing one-way valve automatically closes, the fluid is prevented from flowing back, and the fluid cannot flush the one-way valve for circulation. That is, when the fluid is accumulated to a certain fluid force at the inlet thereof in the closed state of the back flush check valve, the back flush check valve is opened, the flow path is circulated, the fluid force and the flow rate are decreased, and when the fluid is lower than the set flow rate, the back flush check valve is closed to prevent the flow path from being circulated, and a back flush fluid force is generated. Because the process is fast and always occurs in the operation process, the backflushing fluid force is always generated in the evaporator and the descaling branch, so that the water flow reciprocates in the evaporator and the descaling branch to form pulse water flow. In the evaporator, the recoil fluid force of the pulse water flow acts on the evaporator pipe all the time, so that the scale inside the pipe wall is removed under the action of the force, the evaporator can be descaled without disassembling the unit, and the operation of the unit is not influenced.
Further, the descaling branch 30 further includes: and the first electromagnetic valve 32 is positioned between the chilled water outlet B of the evaporator 10 and the back flushing check valve 31 and is used for controlling the opening and closing of the descaling branch. The first electromagnetic valve can control the descaling branch to be opened and closed, and impact damage of inflow water flow to a target sheet in the backflushing one-way valve can be reduced. During descaling, the back flushing one-way valve is used, the effect of repeated pulse of the fluid is achieved by repeated closing of the back flushing one-way valve through fluid impact, and pulsating water flow is in reciprocating circulation among the evaporator, the first electromagnetic valve 32 and the back flushing one-way valve.
Optionally, the descaling branch 30 may further include: and a second solenoid valve 33 connected to the outlet D of the back flushing check valve 31. The second electromagnetic valve can reduce the impact damage of water flow backflow to the target in the backflushing one-way valve. The second electromagnetic valve and the first electromagnetic valve are opened simultaneously, and the second electromagnetic valve can be closed later than the second electromagnetic valve by a certain time so as to ensure that all the frozen water in the descaling branch is discharged.
Referring to fig. 2, which is a schematic diagram of an air-cooled screw water chiller, a descaling branch is added at a chilled water outlet of a flooded evaporator and connected in parallel to a chilled water outlet pipeline. This unit includes: the system comprises a capacity-adjustable screw compressor 1, an oil separator 2, three air-cooled condensers 3, a ball valve 4, a drying filter 5, an electronic expansion valve 6, a flooded evaporator 10, a first electromagnetic valve 32, a back flushing check valve 31 and a second electromagnetic valve 33. The first electromagnetic valve 32, the backflushing one-way valve 31, the second electromagnetic valve 33 and the connecting pipeline thereof form a descaling branch. The whole machine utilizes the chilled water to produce backwashed water in a fluctuation mode by controlling the on-off of the first electromagnetic valve and the second electromagnetic valve, and the backwashed water enters the flooded evaporator to realize descaling. The pulsating water flow reciprocates between the evaporator, the first solenoid valve and the back flush check valve.
Example two
The present embodiment provides a descaling control method based on pulsating water flow, which is applied to the water chilling unit described in the first embodiment.
Fig. 3 is a flowchart of a descaling control method based on pulsating water flow according to a second embodiment of the present invention, as shown in fig. 3, the method includes the following steps:
s301, acquiring designated operation parameters of the unit.
And S302, judging whether the evaporator meets the descaling condition or not according to the specified operation parameters.
And S303, if so, starting the descaling branch to input pulsating water flow to the evaporator by utilizing the outlet water of the chilled water.
The specified operation parameters are related parameters capable of reflecting the heat exchange condition of the evaporator. Specifying the operating parameters includes at least: parameters related to the compressor operating load and parameters related to the evaporator, such as the evaporation temperature, the chilled water outlet temperature, the evaporation pressure, the compressor operating current, etc. Preferably, after the unit starts to operate for a period of time, the specified operating parameters are obtained, and the descaling conditions are judged. And during the running of the unit, after descaling is stopped, namely after the descaling branch is closed, continuously detecting and acquiring specified running parameters to monitor whether descaling is needed.
According to the descaling control method, according to the designated operation parameters of the unit, the descaling branch is controlled to be opened when descaling is needed, the descaling branch and chilled water are used for yielding water, pulsating water flow is input into the evaporator, and the impact force of the repeated pulse of the pulsating water flow in the flow path is utilized, so that the scale on the inner wall of the evaporator can be removed when the unit operates, the unit does not need to be disassembled, the descaling cost is reduced, the reliability and the service life of the unit are not influenced, meanwhile, descaling is carried out when the unit operates, the machine does not need to be shut down, the normal use of the unit is not influenced, and the descaling mode meets the requirements of energy conservation and. And, simple structure, simple to operate, the operation requires lowly.
Considering that if the descaling branch is started for a long time, damage may be caused to the unit, and the operation of the unit is affected, therefore, after the descaling branch is started, the method further comprises the following steps: detecting whether the starting time of the descaling branch reaches a preset time length or not; if yes, the descaling branch is closed. Specifically, when the preset time is reached, the first electromagnetic valve is controlled to be closed so as to close the descaling branch. And when the descaling condition is met, the descaling branch is opened again.
In an alternative embodiment, determining whether the evaporator meets a descaling condition based on specified operating parameters includes: judging whether the operation load of the compressor meets a first preset condition or not, and judging whether evaporation parameters meet a second preset condition or not, wherein the evaporation parameters comprise evaporation pressure and/or evaporation temperature; and if both are met, determining that the evaporator meets the descaling condition.
The current compressor operation load Q of the unit, that is, Q ═ f (To, Tc, I), can be calculated according To the chilled water outlet water temperature Tc, the evaporation temperature To corresponding To the current evaporation pressure, and the compressor operation current I. For example, if the compressor operation load does not match the evaporation parameter, for example, the compressor operation load is large, but the evaporation pressure is small, which indicates that the evaporator has poor heat exchange effect, which may be caused by scale inside the evaporator, so that the descaling operation can be performed.
According to the embodiment, whether the evaporator needs to be descaled or not is judged according to the current compressor running load and the evaporation parameters of the unit, the judgment result is accurate and reliable, and invalid descaling operation is avoided. Whether the descaling is needed can be judged according to the operation load and the evaporation pressure of the compressor, whether the descaling is needed can be judged according to the operation load and the evaporation temperature of the compressor, and whether the descaling is needed can be judged according to the operation load, the evaporation pressure and the evaporation temperature of the compressor. Of course, if the three parameters of the compressor operation load, the evaporation pressure and the evaporation temperature are considered at the same time, the judgment result is more accurate.
Specifically, judging whether the compressor operation load meets a first preset condition includes: comparing the operation load of the compressor with a first preset threshold value; and if the compressor running load is greater than or equal to a first preset threshold value, determining that the compressor running load meets a first preset condition.
Corresponding to the evaporation parameters, the second preset conditions include: a preset pressure condition and/or a preset temperature condition. Correspondingly, judging whether the evaporation parameter meets the second preset condition comprises the following steps: and judging whether the evaporation pressure meets a preset pressure condition and/or judging whether the evaporation temperature meets a preset temperature condition.
Specifically, whether the evaporation pressure meets the preset pressure condition is judged, including: comparing the evaporating pressure with a second preset threshold value; and if the evaporation pressure is less than or equal to a second preset threshold value, determining that the evaporation pressure meets a preset pressure condition.
Judging whether the evaporation temperature meets the preset temperature condition or not, including: calculating the product of the evaporation temperature and the operation load of the compressor to obtain a reference temperature; comparing the outlet water temperature of the chilled water with the reference temperature; and if the temperature of the outlet water of the chilled water is greater than the reference temperature, determining that the evaporation temperature meets the preset temperature condition.
It should be noted that, the execution sequence of the following steps is not limited by the embodiment of the present invention: and judging whether the running load of the compressor meets a first preset condition or not and judging whether the evaporation parameter meets a second preset condition or not. The two steps can be executed simultaneously or sequentially. If the evaporation parameters include the evaporation pressure and the evaporation temperature at the same time, the step of judging the evaporation pressure and the step of judging the evaporation temperature can be executed simultaneously or sequentially.
The foregoing descaling control scheme is described below with reference to a specific embodiment, however, it should be noted that the specific embodiment is only for better illustration of the present application and is not to be construed as limiting the present application.
Taking an air-cooled screw water chilling unit as an example, a flooded shell and tube evaporator is used and is connected with a chilled water pump circulation path and a descaling branch path.
After the unit operates for a period of time, detecting the pressure P (namely evaporation pressure) of a shell and tube of the unit, the evaporation temperature To corresponding To the evaporation pressure, the chilled water outlet water temperature Tc and the compressor operation current I, and calculating according To the chilled water outlet water temperature Tc, the evaporation temperature To and the compressor operation current I To obtain the current compressor operation load Q of the unit.
According To the compressor operation load Q, the evaporation pressure P and the evaporation temperature To, the heat exchange effect of the shell-tube evaporator and the corresponding change relationship between the shell-tube pressure and the compressor operation load in the whole refrigeration system operation process are comprehensively judged, so that whether descaling is needed or not is determined, namely whether a descaling branch is opened or not is determined.
If Q is more than 50% and P is less than 300kpa, calculating the evaporation temperature To multiplied by Q To obtain a reference temperature, and comparing the chilled water outlet water temperature Tc with the reference temperature To judge whether To open the first electromagnetic valve.
Specifically, if Tc is greater than the reference temperature, it indicates that evaporation pressure is low due to poor heat exchange effect of the evaporator, and the heat exchange effect may be affected by scale, so that the first electromagnetic valve is opened, the scale removal branch is connected, chilled water flows into the chilled water outlet pipeline and the scale removal branch at the same time, the chilled water outlet pipeline is responsible for circulation of the chilled water, and the scale removal branch is used for providing pulsating water flow to remove scale inside the evaporator. And if Tc is less than or equal to the reference temperature, the descaling operation is not executed, and the unit continues to operate.
EXAMPLE III
The embodiment provides a descaling control device based on pulsating water flow, which can be used for realizing the descaling control method in the embodiment. The device can be implemented by software and/or hardware, and can be integrated into the group controller.
Fig. 4 is a block diagram of a descaling control device based on pulsating water flow according to a third embodiment of the present invention, and as shown in fig. 4, the device includes:
an obtaining module 41, configured to obtain specified operation parameters of the unit;
a judging module 42, configured to judge whether the evaporator meets a descaling condition according to a specified operating parameter;
and the control module 43 is used for opening the descaling branch if the water flow is positive so as to input pulsating water flow to the evaporator by utilizing the outlet water of the chilled water.
Optionally, the determining module 42 includes:
the judging unit is used for judging whether the running load of the compressor meets a first preset condition or not and judging whether the evaporation parameters meet a second preset condition or not, wherein the evaporation parameters comprise evaporation pressure and/or evaporation temperature;
and the determining unit is used for determining that the evaporator meets the descaling condition if the two conditions are met.
Optionally, the determining unit includes: the first judgment subunit is used for comparing the operation load of the compressor with a first preset threshold value; and if the compressor running load is greater than or equal to a first preset threshold value, determining that the compressor running load meets a first preset condition.
The second preset condition includes a preset pressure condition and/or a preset temperature condition.
Optionally, the determining unit includes: the second judgment subunit is used for comparing the evaporation pressure with a second preset threshold value; and if the evaporation pressure is less than or equal to a second preset threshold value, determining that the evaporation pressure meets a preset pressure condition.
Optionally, the determining unit includes: the third judging subunit is used for calculating the product of the evaporation temperature and the running load of the compressor to obtain a reference temperature; comparing the outlet water temperature of the chilled water with the reference temperature; and if the temperature of the outlet water of the chilled water is greater than the reference temperature, determining that the evaporation temperature meets the preset temperature condition.
Optionally, the control module 43 is further configured to: after a descaling branch is started, detecting whether the starting time of the descaling branch reaches a preset time length; if yes, the descaling branch is closed.
The device can execute the method provided by the embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
Example four
The present embodiment provides a computer-readable storage medium on which a computer program is stored, the program implementing the descaling control method according to the second embodiment of the present invention when executed by a processor.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (11)
1. The utility model provides a water chilling unit, including the evaporimeter and with the refrigerated water outlet pipe way that the evaporimeter is connected, its characterized in that still includes:
and the descaling branch is connected with the chilled water outlet pipeline in parallel and used for inputting pulsating water flow to the evaporator by utilizing the chilled water outlet under the opening state of the branch, wherein the pulsating water flow reciprocates in the evaporator and the descaling branch.
2. The chiller according to claim 1, wherein the descaling branch comprises:
the back flushing one-way valve is periodically opened and closed according to the change of the water flow speed at the inlet of the back flushing one-way valve, and generates a force opposite to the water inlet direction when the back flushing one-way valve is closed so as to form the pulse water flow.
3. The chiller according to claim 2, wherein the descaling branch further comprises:
and the first electromagnetic valve is positioned between the chilled water outlet of the evaporator and the back flushing one-way valve and is used for controlling the opening and closing of the descaling branch.
4. The chiller according to claim 2, wherein the descaling branch further comprises: a second solenoid valve connected to an outlet of the backwash check valve.
5. A descaling control method applied to the water chilling unit according to any one of claims 1 to 4, the method comprising:
acquiring designated operation parameters of the unit;
judging whether the evaporator meets a descaling condition or not according to the specified operation parameters;
if so, starting the descaling branch to input pulsating water flow to the evaporator by utilizing the outlet water of the chilled water.
6. The method of claim 5, wherein determining whether the evaporator meets a descaling condition based on the specified operating parameters comprises:
judging whether the operation load of the compressor meets a first preset condition or not, and judging whether evaporation parameters meet a second preset condition or not, wherein the evaporation parameters comprise evaporation pressure and/or evaporation temperature;
and if both are met, determining that the evaporator meets the descaling condition.
7. The method of claim 6, wherein determining whether the compressor operating load satisfies a first predetermined condition comprises:
comparing the operating load of the compressor with a first preset threshold value;
and if the compressor running load is greater than or equal to the first preset threshold, determining that the compressor running load meets the first preset condition.
8. The method of claim 6, wherein the second preset condition comprises a preset pressure condition; judging whether the evaporation parameters meet a second preset condition or not, wherein the judgment comprises the following steps:
comparing the evaporation pressure with a second preset threshold value;
and if the evaporation pressure is smaller than or equal to the second preset threshold, determining that the evaporation pressure meets the preset pressure condition.
9. The method of claim 6, wherein the second preset condition comprises a preset temperature condition; judging whether the evaporation parameters meet a second preset condition or not, wherein the judgment comprises the following steps:
calculating the product of the evaporation temperature and the running load of the compressor to obtain a reference temperature;
comparing the outlet water temperature of the chilled water with the reference temperature;
and if the temperature of the outlet water of the chilled water is greater than the reference temperature, determining that the evaporation temperature meets the preset temperature condition.
10. The method of claim 5, further comprising, after opening the descaling branch:
detecting whether the starting time of the descaling branch reaches a preset time length or not;
if yes, the descaling branch is closed.
11. A computer-readable storage medium on which a computer program is stored, the program, when executed by a processor, implementing a descaling control method according to any one of claims 5 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN115143835A (en) * | 2022-06-08 | 2022-10-04 | 华能武汉发电有限责任公司 | Cooler control method and device |
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