CN113188269B - Shutdown control method and device of enthalpy-increasing heat pump system - Google Patents
Shutdown control method and device of enthalpy-increasing heat pump system Download PDFInfo
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- CN113188269B CN113188269B CN202010030764.0A CN202010030764A CN113188269B CN 113188269 B CN113188269 B CN 113188269B CN 202010030764 A CN202010030764 A CN 202010030764A CN 113188269 B CN113188269 B CN 113188269B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention provides a shutdown control method and a shutdown control device of an enthalpy-increasing heat pump system, wherein the method comprises the following steps: controlling the electronic expansion valve to close according to a shutdown instruction; controlling the compressor, the evaporator and the condenser to maintain working states, and sequentially controlling the four-way valve to be switched from a first conduction state to a second conduction state, the electronic expansion valve to be opened and the compressor to stop working; the first conduction state is that the first end is communicated with the second end, and the third end is communicated with the fourth end; the second conduction state is that the first end is communicated with the fourth end, and the second end is communicated with the third end; when the four-way valve is in a first conduction state, a first pressure difference is formed between the first pipeline and the second pipeline; controlling the evaporator and the condenser to maintain the working state, and sequentially controlling the fan to stop working, the four-way valve to be closed and the electronic expansion valve to be closed so as to form a second pressure difference between the first pipeline and the second pipeline, wherein the first pressure difference is greater than the second pressure difference; the invention reduces the vibration and noise when the heat pump system pipeline is shut down.
Description
Technical Field
The invention relates to the technical field of heat pump control, in particular to a shutdown control method and device of an enthalpy-increasing heat pump system.
Background
With the increasing competition of the heat pump market for daily use, the requirements of the market on cost control of various complete machine developers are continuously improved. In order to ensure the competitiveness of the complete machine product, each complete machine developer continuously reduces the number of system components and lowers the cost of each component under the condition of meeting the performance and reliability. For example, many complete machine developers gradually adopt enthalpy-increasing capillary tubes to replace enthalpy-increasing electronic expansion valves, so that the cost of the complete machine is greatly reduced.
After the enthalpy-increasing capillary tube is used, the performance of the heat pump unit is stable during starting and running, and the pressure in the system can reach the optimal performance under the adjusting action of the controller. However, when the heat pump unit is shut down, the pressure difference in the enthalpy-increasing pipeline is large and cannot be effectively controlled, and large impact is generated on the system pipeline, so that the system pipeline vibrates greatly, the noise is obvious, and the system pipeline is broken over time.
Disclosure of Invention
In view of the above, the present invention provides a shutdown control method and apparatus for an enthalpy-increasing heat pump system, which reduces the pressure difference of the enthalpy-increasing pipeline when the heat pump system is shutdown, reduces the vibration and noise of the enthalpy-increasing pipeline, and improves the stability and reliability of the heat pump system.
According to one aspect of the invention, a shutdown control method of an enthalpy-increasing heat pump system is provided, which is applied to the enthalpy-increasing heat pump system, the enthalpy-increasing heat pump system comprises a compressor, an evaporator, a condenser, a four-way valve, a fan, an electronic expansion valve and an enthalpy-increasing capillary tube, wherein the compressor is provided with an exhaust port, an enthalpy-increasing port and an air suction port, the condenser is connected in series with the exhaust port and connected to the enthalpy-increasing capillary tube to form a first pipeline, and the evaporator is connected in series with the electronic expansion valve and connected to the air suction port to form a second pipeline; the first end of the four-way valve is connected with the exhaust port, the second end of the four-way valve is connected with the first pipeline, the third end of the four-way valve is connected with the air suction port, and the fourth end of the four-way valve is connected with the second pipeline; the method comprises the following steps:
controlling the electronic expansion valve to close according to a shutdown instruction;
controlling the compressor, the evaporator and the condenser to maintain working states, and sequentially controlling the four-way valve to be switched from a first conduction state to a second conduction state, the electronic expansion valve to be opened and the compressor to stop working; the first conduction state is that the first end is communicated with the second end, and the third end is communicated with the fourth end; the second conduction state is that the first end is communicated with the fourth end, and the second end is communicated with the third end; when the four-way valve is in a first conduction state, a first pressure difference is formed between the first pipeline and the second pipeline;
and controlling the evaporator and the condenser to maintain working states, and sequentially controlling the fan to stop working, the four-way valve to be closed and the electronic expansion valve to be closed so as to form a second pressure difference between the first pipeline and the second pipeline, wherein the first pressure difference is greater than the second pressure difference.
Preferably, the enthalpy-increasing heat pump system further comprises a three-way valve and a plate heat exchanger, the exhaust port, the four-way valve, the condenser, the plate heat exchanger, the three-way valve and the enthalpy-increasing capillary tube are sequentially connected to form the first pipeline, and the electronic expansion valve, the evaporator, the four-way valve and the air suction port are sequentially connected to form the second pipeline.
Preferably, the controlling the compressor, the evaporator and the condenser to maintain the working state, and sequentially controlling the four-way valve to switch from the first conduction state to the second conduction state, the electronic expansion valve to be opened, and the compressor to stop working includes the following steps:
after controlling the compressor, the evaporator and the condenser to maintain the working state for a first preset time, controlling the four-way valve to be switched from a first conduction state to a second conduction state;
after controlling the compressor, the evaporator and the condenser to maintain the working state for a second preset time, controlling the electronic expansion valve to be opened;
after controlling the compressor, the evaporator and the condenser to maintain the working state for a third preset time, controlling the compressor to stop working; the first preset time, the second preset time and the third preset time are increased in sequence.
Preferably, the controlling the evaporator and the condenser to maintain a working state, and sequentially controlling the fan to stop working, the four-way valve to be closed, and the electronic expansion valve to be closed includes the following steps:
after controlling the evaporator and the condenser to maintain the working state for a fourth preset time, controlling the fan to stop working and the four-way valve to be closed;
controlling the electronic expansion valve to close after the time for controlling the evaporator and the condenser to maintain the working state is greater than or equal to a fifth preset time; the fourth preset time is less than the fifth preset time.
Preferably, the controlling the evaporator and the condenser to maintain a working state, and sequentially controlling the fan to stop working, the four-way valve to be closed, and the electronic expansion valve to be closed includes the following steps:
after controlling the evaporator and the condenser to maintain the working state for a fourth preset time, controlling the fan to stop working and the four-way valve to be closed;
controlling the electronic expansion valve to close after the time for controlling the evaporator and the condenser to maintain the working state is greater than or equal to a fifth preset time; and the third preset time, the fourth preset time and the fifth preset time are increased in sequence.
Preferably, after the time for controlling the evaporator and the condenser to maintain the working state is greater than or equal to a fifth preset time, the method for controlling the electronic expansion valve to close comprises the following steps:
acquiring a current first pressure value in the first pipeline and a current second pressure value in the second pipeline;
judging whether the first pressure value is smaller than the second pressure value or not, and whether the time for maintaining the working state of the evaporator and the condenser is larger than or equal to a fifth preset time or not;
and if the first pressure value is smaller than the second pressure value and the time for maintaining the working state of the evaporator and the condenser is longer than or equal to a fifth preset time, controlling the electronic expansion valve to close.
Preferably, the method includes the following steps that after the evaporator and the condenser are controlled to maintain the working state for a fourth preset time, the fan is controlled to stop working, the four-way valve is closed, and after the evaporator and the condenser are controlled to maintain the working state for a fifth preset time or longer, the electronic expansion valve is controlled to be closed:
acquiring a current first pressure value in the first pipeline and a current second pressure value in the second pipeline;
and when the first pressure difference is detected to be gradually reduced and the difference value between the first pressure value and the second pressure value is smaller than a first preset threshold value, controlling the opening degree of the electronic expansion valve to be reduced by half.
Preferably, after the time for controlling the evaporator and the condenser to maintain the working state is greater than or equal to a fifth preset time, the method for controlling the electronic expansion valve to close comprises the following steps:
judging whether the difference value between the first pressure value and the second pressure value is smaller than a second preset threshold value or not, and whether the time for maintaining the working state of the evaporator and the condenser is larger than or equal to a fifth preset time or not;
if the difference value between the first pressure value and the second pressure value is smaller than the second preset threshold value, and the time for maintaining the working state of the evaporator and the condenser is longer than or equal to a fifth preset time, controlling the electronic expansion valve to close; the first preset threshold is greater than the second preset threshold.
Preferably, the enthalpy-increasing heat pump system further includes a plate heat exchanger, the enthalpy-increasing capillary tube, the plate heat exchanger and the enthalpy-increasing port are sequentially connected to form a third pipeline, and after the time for controlling the evaporator and the condenser to maintain the working state is greater than or equal to a fifth preset time, the electronic expansion valve is controlled to be closed, including the following steps:
acquiring a current first pressure value in the first pipeline and a current third pressure value in the third pipeline;
judging whether the difference value between the first pressure value and the third pressure value is smaller than a third preset threshold value or not, and whether the time for maintaining the working state of the evaporator and the condenser is larger than or equal to a fifth preset time or not;
and if the difference value between the first pressure value and the third pressure value is smaller than the third preset threshold value and the time for maintaining the working state of the evaporator and the condenser is longer than or equal to the fifth preset time, controlling the electronic expansion valve to close.
According to another aspect of the present invention, a shutdown control device of an enthalpy-increasing heat pump system is provided, which is applied to the enthalpy-increasing heat pump system, the enthalpy-increasing heat pump system includes a compressor, an evaporator, a condenser, a four-way valve, a fan, an electronic expansion valve, and an enthalpy-increasing capillary tube, the compressor has an exhaust port, an enthalpy-increasing port, and an air suction port, the condenser is connected in series to the enthalpy-increasing capillary tube from the exhaust port to form a first pipeline, and the evaporator is connected in series to the air suction port to form a second pipeline from the electronic expansion valve; the first end of the four-way valve is connected with the exhaust port, the second end of the four-way valve is connected with the first pipeline, the third end of the four-way valve is connected with the air suction port, and the fourth end of the four-way valve is connected with the second pipeline; the device comprises:
the electronic expansion valve closing module is used for controlling the electronic expansion valve to be closed according to a shutdown instruction;
the first control module is used for controlling the compressor, the evaporator and the condenser to maintain working states and sequentially controlling the four-way valve to be switched from a first conduction state to a second conduction state, the electronic expansion valve to be opened and the compressor to stop working; the first conduction state is that the first end is communicated with the second end, and the third end is communicated with the fourth end; the second conduction state is that the first end is communicated with the fourth end, and the second end is communicated with the third end; when the four-way valve is in a first conduction state, a first pressure difference is formed between the first pipeline and the second pipeline;
and the second control module is used for controlling the evaporator and the condenser to maintain working states and sequentially controlling the fan to stop working, the four-way valve to be closed and the electronic expansion valve to be closed so as to form a second pressure difference between the first pipeline and the second pipeline, wherein the first pressure difference is greater than the second pressure difference.
Compared with the prior art, the invention has the beneficial effects that:
the shutdown control method and the shutdown control device of the enthalpy-increasing heat pump system provided by the invention have the advantages that the electronic expansion valve is closed firstly when the system is shut down, then the four-way valve is controlled to reverse, the electronic expansion valve is opened, the compressor is shut down, the fan is closed, the four-way valve is closed and the electronic expansion valve is closed in sequence, so that the pressure difference between the first pipeline and the second pipeline is reduced, the scouring effect of a refrigerant on the system pipeline is effectively weakened, the vibration and the noise of the system pipeline when the system is shut down are reduced, the stability and the reliability of the heat pump system are improved, and the service life of the heat pump system is prolonged.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic flow chart illustrating a shutdown control method of an enthalpy-increasing heat pump system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of the enthalpy-increasing heat pump system;
FIG. 3 is a schematic diagram of the four-way valve of FIG. 2;
FIG. 4 is a detailed flowchart of step S20 in FIG. 1;
fig. 5 is a schematic specific flowchart of step S302 or step S304 in this embodiment;
fig. 6 is a schematic structural diagram of a shutdown control device of the enthalpy-increasing heat pump system according to the embodiment of the present invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.
As shown in fig. 1, an embodiment of the present invention discloses a shutdown control method for an enthalpy-increasing heat pump system, which is applied to the enthalpy-increasing heat pump system. In this embodiment, fig. 2 exemplarily shows an enthalpy-increasing heat pump system, and the enthalpy-increasing heat pump system in fig. 2 includes a compressor 201, a four-way valve 202, a condenser 203, a plate heat exchanger 204, a three-way valve 205, an enthalpy-increasing capillary tube 206, an electronic expansion valve 207, an evaporator 208, and a fan 209. The compressor 201 includes an exhaust port 210, an enthalpy increasing port 211, and an intake port 212. The condenser 203 is connected in series from the exhaust port 210 to the enthalpy-increasing capillary 206 to form a first pipeline. A second line is formed by connecting the evaporator 208 to the suction port 212 in series from the electronic expansion valve 207.
Specifically, in the present embodiment, the exhaust port 210, the four-way valve 202, the condenser 203, the plate heat exchanger 204, the three-way valve 205, and the enthalpy-increasing capillary tube 206 are sequentially connected to form the first pipeline, the electronic expansion valve 207, the evaporator 208, the four-way valve 202, and the suction port 212 are sequentially connected to form the second pipeline, and the enthalpy-increasing capillary tube 206, the plate heat exchanger 204, and the enthalpy-increasing port 211 are sequentially connected to form the third pipeline. Fig. 3 is a schematic diagram of the structure of four-way valve 202 in fig. 2, and as shown in fig. 3, four-way valve 202 has four ports, namely, a first port 301, a second port 302, a third port 303 and a fourth port 304, wherein first port 301 is connected to exhaust port 210, second port 302 is connected to the first pipeline, third port 303 is connected to intake port 212, and fourth port 304 is connected to the second pipeline.
In the prior art, when the system is shut down, the control fan 209 is stopped after the control system maintains the working state for a period of time. And then the rest devices are continuously controlled to work for a period of time, and the electronic expansion valve 207 is controlled to be closed. At this time, the pressure difference between the first pipeline and the second pipeline is large, so that the enthalpy-increasing pipeline (the pipeline connected between the enthalpy-increasing capillary tube 206 and the plate heat exchanger 204) cannot be closed under the condition of large pressure difference, a large amount of refrigerant enters the enthalpy-increasing pipeline, and the enthalpy-increasing pipeline is flushed, so that the problems of obvious vibration and large noise of the enthalpy-increasing pipeline are caused.
The shutdown control method of the enthalpy-increasing heat pump system disclosed by the embodiment comprises the following steps of:
s10, controlling the electronic expansion valve 207 to close according to the shutdown command. That is, after the shutdown command is received, the electronic expansion valve 207 is first closed.
S20, the compressor 201, the evaporator 208 and the condenser 203 are controlled to maintain the operating state, and the four-way valve 202 is switched from the first conduction state to the second conduction state, the electronic expansion valve 207 is opened and the compressor 201 is stopped. The first conduction state is that the first end 301 and the second end 302 are communicated, and the third end 303 and the fourth end 304 are communicated. The second conduction state is that the first end 301 and the fourth end 304 are communicated, and the second end 302 and the third end 303 are communicated. When four-way valve 202 is in the first conduction state, a first pressure difference is formed between the first pipeline and the second pipeline.
S30, the evaporator 208 and the condenser 203 are controlled to maintain their operating states, and the blower 209, the four-way valve 202, and the electronic expansion valve 207 are sequentially controlled to stop operating. So as to form a second pressure difference between the first pipeline and the second pipeline, wherein the first pressure difference is larger than the second pressure difference.
Specifically, as shown in fig. 4, step S20 includes:
s201, after the compressor 201, the evaporator 208 and the condenser 203 are controlled to maintain the working state for a first preset time, the four-way valve 202 is controlled to switch from the first conduction state to the second conduction state. At this time, a communication pipeline is formed by the communication of an exhaust port 210 of the compressor 201 through the four-way valve 202 and the fan 209 to the electronic expansion valve 207, and a communication pipeline is formed by the communication of an enthalpy-increasing capillary tube 206 through the plate heat exchanger 204, the condenser 203, the four-way valve 202 to an air suction port 212 of the compressor 201. That is, the four-way valve 202 completes a reversing operation, and changes the flow direction of the refrigerant in the system pipeline.
S202, after controlling the compressor 201, the evaporator 208 and the condenser 203 to maintain the operating state for a second preset time, controlling the electronic expansion valve 207 to open. The blower 209, the electronic expansion valve 207 and the enthalpy-increasing capillary tube 206 are communicated with each other to form a communication pipeline.
And S203, controlling the compressor 201 to stop operating after the compressor 201, the evaporator 208 and the condenser 203 are controlled to maintain the operating state for a third preset time. The first preset time, the second preset time and the third preset time are increased in sequence. For example, the first preset time is 4 seconds, the second preset time is 6 seconds, and the third preset time is 10 seconds.
Specifically, step S30 includes:
s301, after controlling the evaporator 208 and the condenser 203 to maintain the working state for a fourth preset time, controlling the fan 209 to stop working and the four-way valve 202 to close.
S302, controlling the electronic expansion valve 207 to close after the time for maintaining the evaporator 208 and the condenser 203 in the operating state is greater than or equal to a fifth preset time. The third preset time, the fourth preset time and the fifth preset time are increased in sequence. For example, the fourth preset time is 13 seconds, the fifth preset time is 15 seconds, and it should be noted that specific values of the first preset time, the second preset time, the third preset time, the fourth preset time, and the fifth preset time are not limited in the present invention, and those skilled in the art can set the values according to types of different heat pump units.
By reversing the direction of the four-way valve 202, the flow direction of the refrigerant is changed before the shutdown, so that the pressure in the first pipeline is gradually reduced, and the pressure in the second pipeline is close to zero after the electronic expansion valve 207 is closed for the first time. Then, after the electronic expansion valve 207 is opened again, the pressure in the second pipeline gradually rises, and the pressure difference between the first pipeline and the second pipeline gradually decreases, that is, the impact of the pressure in the enthalpy-increasing pipeline on the refrigerant gradually decreases, then the system is shut down and stops working, and the enthalpy-increasing pipeline cannot generate obvious vibration or noise.
As another embodiment of the present invention, specifically, step S30 includes:
s303, after controlling the evaporator 208 and the condenser 203 to maintain the working state for a fourth preset time, controlling the fan 209 to stop working and the four-way valve 202 to close.
And S304, controlling the electronic expansion valve 207 to close after the time for maintaining the working state of the evaporator 208 and the condenser 203 is controlled to be greater than or equal to a fifth preset time. The fourth preset time is less than the fifth preset time.
As another embodiment of the present invention, as shown in fig. 5, step S302 or step S304 includes:
s3021, acquiring a current first pressure value in the first pipeline and a current second pressure value in the second pipeline;
s3022, determining whether the first pressure value is less than the second pressure value, and whether the time for the evaporator 208 and the condenser 203 to maintain the working state is greater than or equal to a fifth preset time;
s3023, if the first pressure value is less than the second pressure value and the time period during which the evaporator 208 and the condenser 203 are maintained in the operating state is greater than or equal to a fifth predetermined time period, controlling the electronic expansion valve 207 to close. Otherwise, step S3021 is executed in a loop. Since the first pressure value is greater than the second pressure value at the beginning, and then the first pressure value is gradually decreased, and the second pressure value is gradually increased, when the first pressure value is less than the second pressure value, it indicates that the pressure difference between the first pipeline and the second pipeline is already extremely small, and at this time, the electronic expansion valve 207 is closed, so that the impact of the refrigerant on the enthalpy-increasing pipeline is extremely small.
As another embodiment of the present invention, specifically, between step S301 and step S302, or between step S303 and step S304, the method includes:
acquiring a current first pressure value in the first pipeline and a current second pressure value in the second pipeline;
when the first pressure difference is detected to be gradually reduced and the difference between the first pressure value and the second pressure value is smaller than a first preset threshold value, the opening degree of the electronic expansion valve 207 is controlled to be reduced by half. Therefore, the reduced amplitude of the first pressure value and the increased amplitude of the second pressure value can be reduced, and the pressure difference between the first pipeline and the second pipeline can be conveniently controlled.
Then, step S302 or step S304 includes:
judging whether the difference value between the first pressure value and the second pressure value is smaller than a second preset threshold value or not, and whether the time for maintaining the working state of the evaporator 208 and the condenser 203 is larger than or equal to a fifth preset time or not;
if the difference between the first pressure value and the second pressure value is smaller than the second preset threshold value, and the time for maintaining the working state of the evaporator 208 and the condenser 203 is longer than or equal to a fifth preset time, controlling the electronic expansion valve 207 to close; the first preset threshold is greater than the second preset threshold.
Specifically, as another embodiment of the present invention, the enthalpy-increasing capillary tube 206, the plate heat exchanger 204, and the enthalpy-increasing port 211 are sequentially connected to form a third pipeline, and step S302 or step S304 includes:
s3041, obtaining a current first pressure value in the first pipeline and a current third pressure value in the third pipeline;
s3042, determining whether the difference between the first pressure value and the third pressure value is less than a third preset threshold, and whether the time for the evaporator 208 and the condenser 203 to maintain the working state is greater than or equal to the fifth preset time;
s3043, if the difference between the first pressure value and the third pressure value is less than the third predetermined threshold and the time for the evaporator 208 and the condenser 203 to maintain the working state is greater than or equal to a fifth predetermined time, controlling the electronic expansion valve 207 to close. Otherwise, step S3041 is executed in a loop. Therefore, after the electronic expansion valve 207 is closed, the pressure difference between the first pipeline and the third pipeline is small, and the refrigerant is further ensured not to generate a large impact effect on the enthalpy-increasing pipeline.
As shown in fig. 6, the embodiment of the present invention further discloses a shutdown control device 6 of the enthalpy-increasing heat pump system, which is used for implementing the shutdown control method of the enthalpy-increasing heat pump system disclosed in the foregoing embodiment. The device is applied to an enthalpy-increasing heat pump system, the enthalpy-increasing heat pump system comprises a compressor, an evaporator, a condenser, a four-way valve, a plate heat exchanger, a fan, an electronic expansion valve and an enthalpy-increasing capillary tube, the compressor is provided with an exhaust port, an enthalpy-increasing port and an air suction port, the condenser is connected in series with the exhaust port and connected to the enthalpy-increasing capillary tube to form a first pipeline, and the evaporator is connected in series with the electronic expansion valve and connected to the air suction port to form a second pipeline; the first end of the four-way valve is connected with the exhaust port, the second end is connected with the first pipeline, the third end is connected with the air suction port, and the fourth end is connected with the second pipeline. The device includes:
an electronic expansion valve closing module 61, configured to control the electronic expansion valve to close according to a shutdown instruction;
a first control module 62, configured to control the compressor, the evaporator, and the condenser to maintain an operating state, and sequentially control the four-way valve to switch from a first conduction state to a second conduction state, open the electronic expansion valve, and stop the operation of the compressor; the first conduction state is that the first end is communicated with the second end, and the third end is communicated with the fourth end; the second conduction state is that the first end is communicated with the fourth end, and the second end is communicated with the third end; when the four-way valve is in a first conduction state, a first pressure difference is formed between the first pipeline and the second pipeline;
and a second control module 63, configured to control the evaporator and the condenser to maintain a working state, and sequentially control the fan to stop working, the four-way valve to close, and the electronic expansion valve to close, so that a second pressure difference is formed between the first pipeline and the second pipeline, where the first pressure difference is greater than the second pressure difference.
It can be understood that the shutdown control device of the enthalpy-increasing heat pump system disclosed by the invention also comprises other existing functional modules supporting the operation of the shutdown control device of the enthalpy-increasing heat pump system. The shutdown control device of the enthalpy-increasing heat pump system shown in fig. 6 is only an example, and should not bring any limitation to the functions and the application range of the embodiment of the present invention.
The shutdown control device of the enthalpy-increasing heat pump system in this embodiment is used to implement the shutdown control method of the enthalpy-increasing heat pump system, so for the specific implementation steps of the shutdown control device of the enthalpy-increasing heat pump system, reference may be made to the description of the shutdown control method of the enthalpy-increasing heat pump system, and details are not repeated here.
In summary, the shutdown control method and the shutdown control device of the enthalpy-increasing heat pump system disclosed by the invention have at least the following advantages:
according to the shutdown control method and the shutdown control device for the enthalpy-increasing heat pump system, when the system is shut down, the electronic expansion valve is closed, then the four-way valve reversing, the electronic expansion valve opening, the compressor shutdown, the fan closing, the four-way valve closing and the electronic expansion valve closing are sequentially controlled, so that the pressure difference between the first pipeline and the second pipeline is reduced, the flushing effect of a refrigerant on the system pipeline is effectively weakened, the vibration and the noise of the system pipeline during shutdown are reduced, the stability and the reliability of the heat pump system are improved, and the service life of the heat pump system is prolonged.
In the description herein, references to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "another embodiment," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. A shutdown control method of an enthalpy-increasing heat pump system is applied to the enthalpy-increasing heat pump system, the enthalpy-increasing heat pump system comprises a compressor, an evaporator, a condenser, a four-way valve, a fan, an electronic expansion valve and an enthalpy-increasing capillary tube, the compressor is provided with an exhaust port, an enthalpy-increasing port and an air suction port, the condenser is connected in series with the exhaust port and connected to the enthalpy-increasing capillary tube to form a first pipeline, and the evaporator is connected in series with the electronic expansion valve and connected to the air suction port to form a second pipeline; the first end of the four-way valve is connected with the exhaust port, the second end of the four-way valve is connected with the first pipeline, the third end of the four-way valve is connected with the air suction port, and the fourth end of the four-way valve is connected with the second pipeline; characterized in that the method comprises the following steps:
controlling the electronic expansion valve to close according to a shutdown instruction;
controlling the compressor, the evaporator and the condenser to maintain working states, and sequentially controlling the four-way valve to be switched from a first conduction state to a second conduction state, the electronic expansion valve to be opened and the compressor to stop working; the first conduction state is that the first end is communicated with the second end, and the third end is communicated with the fourth end; the second conduction state is that the first end is communicated with the fourth end, and the second end is communicated with the third end; when the four-way valve is in a first conduction state, a first pressure difference is formed between the first pipeline and the second pipeline;
and controlling the evaporator and the condenser to maintain working states, and sequentially controlling the fan to stop working, the four-way valve to be closed and the electronic expansion valve to be closed so as to form a second pressure difference between the first pipeline and the second pipeline, wherein the first pressure difference is greater than the second pressure difference.
2. The shutdown control method of the enthalpy-increasing heat pump system according to claim 1, wherein the enthalpy-increasing heat pump system further includes a three-way valve and a plate heat exchanger, the exhaust port, the four-way valve, the condenser, the plate heat exchanger, the three-way valve and the enthalpy-increasing capillary tube are sequentially connected to form the first pipeline, and the electronic expansion valve, the evaporator, the four-way valve and the air suction port are sequentially connected to form the second pipeline.
3. The shutdown control method of an enthalpy-increasing heat pump system according to claim 1, wherein the controlling the compressor, the evaporator and the condenser to maintain an operating state, and sequentially controlling the four-way valve to switch from a first conducting state to a second conducting state, the electronic expansion valve to be opened, and the compressor to stop operating, comprises the steps of:
after controlling the compressor, the evaporator and the condenser to maintain the working state for a first preset time, controlling the four-way valve to be switched from a first conduction state to a second conduction state;
after controlling the compressor, the evaporator and the condenser to maintain the working state for a second preset time, controlling the electronic expansion valve to be opened;
after controlling the compressor, the evaporator and the condenser to maintain the working state for a third preset time, controlling the compressor to stop working; the first preset time, the second preset time and the third preset time are increased in sequence.
4. The shutdown control method of the enthalpy-increasing heat pump system according to claim 1, wherein the controlling the evaporator and the condenser to maintain an operating state, and sequentially controlling the fan to stop operating, the four-way valve to close, and the electronic expansion valve to close, comprises the steps of:
after controlling the evaporator and the condenser to maintain the working state for a fourth preset time, controlling the fan to stop working and the four-way valve to be closed;
controlling the electronic expansion valve to close after the time for controlling the evaporator and the condenser to maintain the working state is greater than or equal to a fifth preset time; the fourth preset time is less than the fifth preset time.
5. The shutdown control method of the enthalpy-increasing heat pump system according to claim 3, wherein the controlling the evaporator and the condenser to maintain an operating state, and sequentially controlling the fan to stop operating, the four-way valve to close, and the electronic expansion valve to close, comprises the steps of:
after controlling the evaporator and the condenser to maintain the working state for a fourth preset time, controlling the fan to stop working and the four-way valve to be closed;
controlling the electronic expansion valve to close after the time for controlling the evaporator and the condenser to maintain the working state is greater than or equal to a fifth preset time; and the third preset time, the fourth preset time and the fifth preset time are increased in sequence.
6. The shutdown control method of the enthalpy-increasing heat pump system according to claim 4 or 5, wherein the controlling of the electronic expansion valve to close after the time for controlling the evaporator and the condenser to maintain the operation state is greater than or equal to a fifth preset time, comprises the steps of:
acquiring a current first pressure value in the first pipeline and a current second pressure value in the second pipeline;
judging whether the first pressure value is smaller than the second pressure value or not, and whether the time for maintaining the working state of the evaporator and the condenser is larger than or equal to a fifth preset time or not;
and if the first pressure value is smaller than the second pressure value and the time for maintaining the working state of the evaporator and the condenser is longer than or equal to a fifth preset time, controlling the electronic expansion valve to close.
7. The shutdown control method of the enthalpy-increasing heat pump system according to claim 4 or 5, wherein the step of controlling the fan to stop operating after controlling the evaporator and the condenser to maintain the operating state for a fourth preset time, and the step of controlling the electronic expansion valve to close after controlling the evaporator and the condenser to maintain the operating state for a fifth preset time or longer comprises the steps of:
acquiring a current first pressure value in the first pipeline and a current second pressure value in the second pipeline;
and when the first pressure difference is detected to be gradually reduced and the difference value between the first pressure value and the second pressure value is smaller than a first preset threshold value, controlling the opening degree of the electronic expansion valve to be reduced by half.
8. The shutdown control method of the enthalpy-increasing heat pump system according to claim 7, wherein the controlling of the electronic expansion valve to close after the time for controlling the evaporator and the condenser to maintain the operation state is greater than or equal to a fifth preset time, comprises the steps of:
judging whether the difference value between the first pressure value and the second pressure value is smaller than a second preset threshold value or not, and whether the time for maintaining the working state of the evaporator and the condenser is larger than or equal to a fifth preset time or not;
if the difference value between the first pressure value and the second pressure value is smaller than the second preset threshold value, and the time for maintaining the working state of the evaporator and the condenser is longer than or equal to a fifth preset time, controlling the electronic expansion valve to close; the first preset threshold is greater than the second preset threshold.
9. The shutdown control method of the enthalpy-increasing heat pump system according to claim 4 or 5, wherein the enthalpy-increasing heat pump system further includes a plate heat exchanger, the enthalpy-increasing capillary tube, the plate heat exchanger, and the enthalpy-increasing port are sequentially connected to form a third pipeline, and after the time for controlling the evaporator and the condenser to maintain the working state is greater than or equal to a fifth preset time, the electronic expansion valve is controlled to be closed, including the following steps:
acquiring a current first pressure value in the first pipeline and a current third pressure value in the third pipeline;
judging whether the difference value between the first pressure value and the third pressure value is smaller than a third preset threshold value or not, and whether the time for maintaining the working state of the evaporator and the condenser is larger than or equal to a fifth preset time or not;
and if the difference value between the first pressure value and the third pressure value is smaller than the third preset threshold value and the time for maintaining the working state of the evaporator and the condenser is longer than or equal to the fifth preset time, controlling the electronic expansion valve to close.
10. A shutdown control device of an enthalpy-increasing heat pump system is applied to the enthalpy-increasing heat pump system, the enthalpy-increasing heat pump system comprises a compressor, an evaporator, a condenser, a four-way valve, a fan, an electronic expansion valve and an enthalpy-increasing capillary tube, the compressor is provided with an exhaust port, an enthalpy-increasing port and an air suction port, the condenser is connected in series with the exhaust port and connected to the enthalpy-increasing capillary tube to form a first pipeline, and the evaporator is connected in series with the electronic expansion valve and connected to the air suction port to form a second pipeline; the first end of the four-way valve is connected with the exhaust port, the second end of the four-way valve is connected with the first pipeline, the third end of the four-way valve is connected with the air suction port, and the fourth end of the four-way valve is connected with the second pipeline; characterized in that the device comprises:
the electronic expansion valve closing module is used for controlling the electronic expansion valve to be closed according to a shutdown instruction;
the first control module is used for controlling the compressor, the evaporator and the condenser to maintain working states and sequentially controlling the four-way valve to be switched from a first conduction state to a second conduction state, the electronic expansion valve to be opened and the compressor to stop working; the first conduction state is that the first end is communicated with the second end, and the third end is communicated with the fourth end; the second conduction state is that the first end is communicated with the fourth end, and the second end is communicated with the third end; when the four-way valve is in a first conduction state, a first pressure difference is formed between the first pipeline and the second pipeline;
and the second control module is used for controlling the evaporator and the condenser to maintain working states and sequentially controlling the fan to stop working, the four-way valve to be closed and the electronic expansion valve to be closed so as to form a second pressure difference between the first pipeline and the second pipeline, wherein the first pressure difference is greater than the second pressure difference.
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