CN114353378B - Heat pump unit control method and device and heat pump unit - Google Patents
Heat pump unit control method and device and heat pump unit Download PDFInfo
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- CN114353378B CN114353378B CN202111531915.1A CN202111531915A CN114353378B CN 114353378 B CN114353378 B CN 114353378B CN 202111531915 A CN202111531915 A CN 202111531915A CN 114353378 B CN114353378 B CN 114353378B
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- 238000000034 method Methods 0.000 title claims abstract description 90
- 230000008569 process Effects 0.000 claims abstract description 39
- 239000003507 refrigerant Substances 0.000 claims abstract description 36
- 238000004781 supercooling Methods 0.000 claims description 55
- 238000004590 computer program Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 230000001502 supplementing effect Effects 0.000 description 7
- 238000011217 control strategy Methods 0.000 description 6
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 239000013589 supplement Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
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- 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
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Abstract
The invention discloses a heat pump unit control method, a control device and a heat pump unit, wherein the method comprises the following steps: the unit operates to acquire the air suction superheat degree, the economizer parameter and the exhaust parameter; judging whether the suction superheat degree reaches an initial target suction superheat degree or not; when the suction superheat degree does not reach the initial target suction superheat degree, executing a first control process: adjusting the opening of the main electronic expansion valve according to the suction superheat degree and the initial target suction superheat degree; and when the suction superheat degree reaches the initial target suction superheat degree, executing a second control process: and adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust parameter. By adopting the invention, the optimal control of the refrigerant flow in different flow paths of the heat pump unit and the optimal regulation and control of the unit efficiency can be realized.
Description
Technical Field
The invention belongs to the technical field of heat pump systems, and particularly relates to a heat pump unit control method and device and a heat pump unit.
Background
The heat pump unit is used as widely used unit equipment at present, and realizes the heat pump function by utilizing a refrigerant circulation system consisting of a compressor, a condenser, an electronic expansion valve, an economizer and an evaporator.
The electronic expansion valve in the refrigerant circulation system of the existing heat pump unit generally comprises a main electronic expansion valve arranged in a main refrigerant circulation path and an auxiliary electronic expansion valve arranged in an air supplementing auxiliary path where an economizer is arranged, and the refrigerant flow of the main path and the auxiliary path is regulated by controlling the opening of the expansion valve so as to meet the performance requirement of the operation of the heat pump unit.
In the prior art, a main electronic expansion valve and an auxiliary electronic expansion valve are adopted for the heat pump unit to control independently. When the opening degree of the main circuit expansion valve is too small, the flow rate of the channel of the auxiliary circuit is increased when the opening degree of the expansion valve is unchanged, and the risk that the compressor passes through the liquid of the auxiliary circuit exists; when the opening of the expansion valve of the main path is overlarge, the flow of the channel of the auxiliary path is reduced when the opening of the expansion valve is unchanged, and the problems of insufficient air supplement and energy efficiency reduction of the compressor exist; in addition, the opening degree of the auxiliary expansion valve can influence the exhaust temperature of the unit, and the unit is easy to fail to stably operate. Therefore, in the conventional expansion valve independent control manner, optimal control of the refrigerant flow rates in the main path and the auxiliary path cannot be obtained, and an optimal state of the unit efficiency is difficult to achieve.
Disclosure of Invention
The invention aims to provide a heat pump unit control method and a control device, which realize the optimal control of the flow of refrigerant in different flow paths of a heat pump unit and the optimal regulation and control of unit efficiency.
In order to achieve the aim of the invention, the control method of the heat pump unit provided by the invention is realized by adopting the following technical scheme:
a heat pump unit control method including a main electronic expansion valve provided in a refrigerant circulation main path and an auxiliary electronic expansion valve provided in a make-up auxiliary path where an economizer is located, the method comprising:
the unit operates to acquire the air suction superheat degree, the economizer parameter and the exhaust parameter;
judging whether the suction superheat degree reaches an initial target suction superheat degree or not;
when the suction superheat degree does not reach the initial target suction superheat degree, executing a first control process: adjusting the opening of the main electronic expansion valve according to the suction superheat degree and the initial target suction superheat degree;
and when the suction superheat degree reaches the initial target suction superheat degree, executing a second control process: adjusting the opening of the main electronic expansion valve and the opening of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust parameter;
The economizer parameter is economizer superheat or economizer subcooling; the exhaust parameter is the exhaust superheat degree or the exhaust temperature.
In a preferred embodiment thereof, the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve are adjusted based on the economizer parameter and the exhaust gas parameter, specifically including:
comparing the economizer parameter with an initial target economizer parameter to obtain a state of the economizer parameter;
and determining whether to adjust the opening of the main electronic expansion valve and the opening of the auxiliary electronic expansion valve based on the exhaust parameters according to the state of the economizer parameters.
In a preferred embodiment, determining whether to adjust the opening of the main electronic expansion valve and the opening of the auxiliary electronic expansion valve based on the exhaust gas parameter according to the state of the economizer parameter specifically includes:
when the economizer parameter is the economizer superheat, the initial target economizer parameter is an initial target economizer superheat; if the state of the economizer superheat degree is not higher than the initial target economizer superheat degree, executing a process of adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the exhaust parameter;
When the economizer parameter is the economizer subcooling degree, the initial target economizer parameter is an initial target economizer subcooling degree; and if the state of the economizer supercooling degree is not lower than the initial target economizer supercooling degree, executing a process of adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the exhaust gas parameter.
In a preferred embodiment thereof, adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust gas parameter includes:
comparing the exhaust gas parameter with a target exhaust gas parameter when the economizer parameter reaches the initial target economizer parameter;
when the exhaust parameter is not higher than the target exhaust parameter, keeping the opening of the main electronic expansion valve unchanged, and adjusting the opening of the auxiliary electronic expansion valve according to the economizer parameter and the initial target economizer parameter;
and when the exhaust parameter is higher than the target exhaust parameter, increasing the initial target air suction superheat degree to obtain an increased target air suction superheat degree, adjusting the opening of the main electronic expansion valve according to the air suction superheat degree and the increased target air suction superheat degree, and adjusting the opening of the auxiliary electronic expansion valve according to the economizer parameter and the initial target economizer parameter.
In a preferred embodiment thereof, adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust gas parameter includes:
comparing the exhaust gas parameter with a target exhaust gas parameter when the economizer superheat is less than an initial target economizer superheat;
when the exhaust parameter reaches the target exhaust parameter, keeping the opening of the main electronic expansion valve and the opening of the auxiliary electronic expansion valve unchanged;
when the exhaust parameter is higher than the target exhaust parameter, increasing the initial target air suction superheat degree to obtain an increased target air suction superheat degree, and adjusting the opening of the main electronic expansion valve according to the air suction superheat degree and the increased target air suction superheat degree; simultaneously reducing the initial target economizer superheat degree, obtaining a reduced target economizer superheat degree, and adjusting the opening of the auxiliary electronic expansion valve according to the economizer superheat degree and the reduced target economizer superheat degree;
when the exhaust parameter is lower than the target exhaust parameter, keeping the opening of the main electronic expansion valve unchanged, increasing the initial target economizer superheat degree, obtaining the increased target economizer superheat degree, and adjusting the opening of the auxiliary electronic expansion valve according to the economizer superheat degree and the increased target economizer superheat degree;
Comparing the exhaust gas parameter to the target exhaust gas parameter when the economizer degree of subcooling is greater than an initial target economizer degree of subcooling;
when the exhaust parameter reaches the target exhaust parameter, keeping the opening of the main electronic expansion valve and the opening of the auxiliary electronic expansion valve unchanged;
when the exhaust parameter is higher than the target exhaust parameter, adjusting the opening of the main electronic expansion valve according to the suction superheat degree and the increased target suction superheat degree; simultaneously increasing the initial target economizer supercooling degree to obtain an increased target economizer supercooling degree, and adjusting the opening of the auxiliary electronic expansion valve according to the economizer supercooling degree and the increased target economizer supercooling degree;
and when the exhaust parameter is lower than the target exhaust parameter, keeping the opening of the main electronic expansion valve unchanged, reducing the initial target economizer supercooling degree, obtaining the reduced target economizer supercooling degree, and adjusting the opening of the auxiliary electronic expansion valve according to the economizer supercooling degree and the reduced target economizer supercooling degree.
In a preferred embodiment thereof, adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust gas parameter includes:
When the superheat degree of the economizer is higher than the initial target superheat degree of the economizer, increasing the initial target suction superheat degree to obtain an increased target suction superheat degree, and adjusting the opening of the main electronic expansion valve according to the suction superheat degree and the increased target suction superheat degree; the initial target economizer superheat degree is reduced, the reduced target economizer superheat degree is obtained, and the opening of the auxiliary electronic expansion valve is adjusted according to the economizer superheat degree and the reduced target economizer superheat degree;
when the economizer supercooling degree is lower than the initial target economizer supercooling degree, increasing the initial target air suction superheat degree to obtain an increased target air suction superheat degree, and adjusting the opening of the main electronic expansion valve according to the air suction superheat degree and the increased target air suction superheat degree; and further increasing the initial target economizer supercooling degree, obtaining an increased target economizer supercooling degree, and adjusting the opening degree of the auxiliary electronic expansion valve according to the economizer supercooling degree and the increased target economizer supercooling degree.
In a preferred embodiment thereof, the method further comprises:
before the first control process and the second control process are executed, the opening degree of the main electronic expansion valve is adjusted to an initial main valve opening degree, and the opening degree of the auxiliary electronic expansion valve is adjusted to an initial auxiliary valve opening degree.
In a preferred embodiment thereof, the method further comprises:
and in the first control process, maintaining the opening degree of the auxiliary electronic expansion valve to be the initial auxiliary valve opening degree.
In order to achieve the aim of the invention, the heat pump unit control device provided by the invention is realized by adopting the following technical scheme:
a heat pump unit control apparatus, the apparatus comprising:
the air suction superheat degree acquisition unit is used for acquiring the air suction superheat degree;
an economizer parameter acquisition unit configured to acquire an economizer parameter; the economizer parameter is economizer superheat or economizer subcooling;
an exhaust parameter acquisition unit configured to acquire an exhaust parameter; the exhaust parameter is exhaust superheat degree or exhaust temperature;
the air suction superheat degree judging unit is used for judging whether the air suction superheat degree reaches an initial target air suction superheat degree or not;
a first processing unit configured to execute a first control procedure when the suction superheat degree does not reach the initial target suction superheat degree: adjusting the opening of the main electronic expansion valve according to the suction superheat degree and the initial target suction superheat degree;
a second processing unit, configured to execute a second control procedure when the suction superheat degree reaches the initial target suction superheat degree: and adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust parameter.
The invention also provides a heat pump unit, which comprises a processor, a memory and a computer program stored on the memory, wherein the processor is configured to execute the computer program to realize the control method of the heat pump unit.
Compared with the prior art, the invention has the advantages and positive effects that:
the control method and the control device of the heat pump unit provided by the invention are characterized in that firstly, the suction superheat degree is taken as a rough adjustment parameter, the opening degree of the main electronic expansion valve is adjusted, so that the main electronic expansion valve rapidly reaches a reasonable opening degree, and then, the economizer parameter and the exhaust parameter are taken as fine adjustment parameters, and the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve are finely adjusted; the main electronic expansion valve and the auxiliary electronic expansion valve are adjusted in a linkage way by adopting the air suction superheat degree, the economizer parameter and the exhaust parameter, so that the coupling control of the opening degrees of the two expansion valves is realized, the optimal control of the refrigerant flow of the refrigerant circulation main path and the refrigerant flow of the air supplementing auxiliary path is realized, the refrigerant flows in different flow paths are ensured to reach an optimal state, the optimization of the unit efficiency is further realized, and the stable and efficient operation of the unit is ensured.
Other features and advantages of the present invention will become apparent upon review of the detailed description of the invention in conjunction with the drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of one embodiment of a heat pump unit control method of the present invention;
FIG. 2 is a schematic flow chart of another embodiment of a heat pump unit control method according to the present invention;
FIG. 3 is a schematic flow chart of a heat pump unit control method according to another embodiment of the present invention;
FIG. 4 is a schematic view of an embodiment of a heat pump unit control apparatus according to the present invention;
fig. 5 is a schematic structural view of an embodiment of the heat pump unit of the present invention.
Description of the embodiments
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and examples.
It should be noted that, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, it should be considered that the technical solutions are not combined, and are not within the scope of protection claimed by the present invention.
For the heat pump unit with the main electronic expansion valve and the auxiliary electronic expansion valve, the prior art generally adopts a mode of mutually independent control to adjust the opening degrees of the two expansion valves, however, the change of the opening degree of each expansion valve not only affects the refrigerant flow of the refrigerant branch where the expansion valve is positioned, but also affects the refrigerant flow in the refrigerant flow path of the whole heat pump unit, and the change of the refrigerant flow of the whole unit affects the refrigerant flow of each refrigerant branch, so that the expansion valves in different branches are difficult to obtain the optimal control of the flow of different branches in a mode of mutually independent control. In order to solve the problems in the prior art, the invention creatively provides linkage adjustment of the main electronic expansion valve and the auxiliary electronic expansion valve of the heat pump unit, so as to realize coupling control of the opening degrees of the two expansion valves and achieve optimal control of flow rates of different refrigerant flow paths.
Fig. 1 is a schematic flow chart of an embodiment of a control method of a heat pump unit according to the present invention, in which the heat pump unit includes a main electronic expansion valve disposed in a main path of a refrigerant cycle and an auxiliary electronic expansion valve disposed in an auxiliary path of an economizer.
For the heat pump unit having the main electronic expansion valve and the auxiliary electronic expansion valve, this embodiment adopts the following procedure for the adjustment of the opening degree of the electronic expansion valve.
Step 101: and acquiring the suction superheat degree, the economizer parameter and the exhaust parameter.
The method for obtaining the suction superheat degree is realized by adopting the prior art. In one embodiment, the suction superheat is determined by the difference between the suction temperature of the heat pump unit and the suction side pressure saturation temperature. The suction temperature is detected by a temperature detecting device provided on the suction side of the compressor, and the suction side pressure saturation temperature is calculated by detecting the pressure on the suction side.
The economizer parameters can be the degree of superheat of the economizer or the degree of supercooling of the economizer, and the acquisition methods are all in the prior art. In one embodiment, the economizer superheat is determined by the difference between the economizer auxiliary outlet temperature and the economizer auxiliary inlet temperature, which are detected by temperature detection means provided at the respective locations.
The exhaust parameters can be the exhaust superheat degree and the exhaust temperature, and the acquisition methods are all the prior art. In one embodiment, the exhaust superheat is determined after correction based on the difference between the exhaust temperature and the outlet temperature. The exhaust temperature and the outlet water temperature are detected by temperature detecting means provided at the corresponding positions.
Step 102: and judging whether the suction superheat degree reaches the initial target suction superheat degree or not. If yes, go to step 104; otherwise, step 103 is performed.
The initial target air suction superheat degree is a preset value, and when the air suction superheat degree reaches the initial target air suction superheat degree, the corresponding opening of the main electronic expansion valve is a reasonable opening, and the heat pump unit can relatively and stably run.
Step 103: when the suction superheat degree does not reach the initial target suction superheat degree, executing a first control process: and adjusting the opening of the main electronic expansion valve according to the suction superheat degree and the initial target suction superheat degree.
And the air suction superheat degree reaches the initial target air suction superheat degree by adjusting the opening degree of the main electronic expansion valve. And if the suction superheat degree does not reach the initial target suction superheat degree, adjusting the opening degree of the main electronic expansion valve. Specifically, the opening of the main electronic expansion valve is adjusted according to the current suction superheat degree and the initial target suction superheat degree until the suction superheat degree reaches the initial target suction superheat degree, and the specific adjustment process is realized by adopting the prior art. In some embodiments, the opening of the main electronic expansion valve is adjusted according to the difference between the suction superheat and the initial target suction superheat and/or the change speed of the suction superheat, so that the suction superheat reaches the initial target suction superheat.
Step 104: and when the suction superheat degree reaches the initial target suction superheat degree, executing a second control process: and adjusting the opening of the main electronic expansion valve and the opening of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust parameter.
In the embodiment of fig. 1, the control strategy executed in two steps is adopted for the adjustment of the opening degree of the expansion valve:
the first step is to execute a first control process, wherein the suction superheat degree is used as a rough adjustment parameter, rough adjustment is carried out on the opening degree of the main electronic expansion valve, and the suction superheat degree reaches the initial target suction superheat degree, so that the main electronic expansion valve can quickly reach a reasonable opening degree, and the heat pump unit can be ensured to be in a relatively stable running state quickly. And secondly, after the suction superheat reaches the initial target suction superheat and the main electronic expansion valve reaches a relatively reasonable opening, executing a second control process, taking the economizer parameter and the exhaust parameter as fine adjustment parameters, finely adjusting the opening of the main electronic expansion valve and the opening of the auxiliary electronic expansion valve, carrying out linkage adjustment on the main electronic expansion valve and the auxiliary electronic expansion valve, realizing the coupling control of the opening of the two expansion valves, realizing the optimized control of the refrigerant flow of the refrigerant circulation main path and the refrigerant flow of the air supplementing auxiliary path, ensuring that the refrigerant flows in different flow paths reach an optimized state, further realizing the optimization of the unit efficiency, and ensuring the stable and efficient operation of the unit.
Fig. 2 is a schematic flow chart of another embodiment of the control method of the heat pump unit according to the present invention, in which the heat pump unit includes a main electronic expansion valve disposed in a main path of the refrigerant cycle and an auxiliary electronic expansion valve disposed in an auxiliary path of the air make-up where the economizer is located. For the heat pump unit having the main electronic expansion valve and the auxiliary electronic expansion valve, this embodiment adopts the following procedure for the adjustment of the opening degree of the electronic expansion valve.
Step 201: and adjusting the opening of the main electronic expansion valve to the initial main valve opening, and adjusting the opening of the auxiliary electronic expansion valve to the initial auxiliary valve opening.
The opening of the initial main valve and the opening of the initial auxiliary valve are preset values. After the heat pump unit is started, the main electronic expansion valve and the auxiliary electronic expansion valve are firstly adjusted to corresponding initial opening degrees, and then subsequent adjustment is executed under the initial opening degrees, so that the adjustment efficiency is improved.
Step 202: and acquiring the suction superheat degree, the economizer parameter and the exhaust parameter.
A specific implementation of this step is described with reference to the embodiment of fig. 1.
Step 203: and judging whether the suction superheat degree reaches the initial target suction superheat degree or not. If yes, go to step 205; otherwise, step 204 is performed.
The initial target air suction superheat degree is a preset value, and when the air suction superheat degree reaches the initial target air suction superheat degree, the corresponding opening of the main electronic expansion valve is a reasonable opening, and the heat pump unit can relatively and stably run.
Step 204: executing a first control procedure: adjusting the opening of the main electronic expansion valve according to the air suction superheat degree and the initial target air suction superheat degree; and keeping the opening of the auxiliary electronic expansion valve to be the initial auxiliary valve opening.
The adjustment of the opening degree of the main electronic expansion valve can be seen in particular from the corresponding description of the embodiment of fig. 1. In addition, in the process of adjusting the opening of the main electronic expansion valve by adopting the suction superheat degree, the opening of the auxiliary electronic expansion valve keeps the initial auxiliary valve opening unchanged.
Step 205: a second control process is performed. After the suction superheat reaches the initial target suction superheat, a second control process, specifically, a fine adjustment process of steps 206 and 207, is performed.
Step 206: the economizer parameter is compared to an initial target economizer parameter to obtain a state of the economizer parameter.
When the initial target economizer parameter reaches the initial target economizer parameter, the opening of the corresponding auxiliary electronic expansion valve is a reasonable opening, and the compressor can obtain reasonable air supplement.
In the second control process, whether the economizer of the heat pump unit exchanges heat effectively or not is judged firstly based on the economizer parameters, and whether reasonable air supplement is provided for the compressor or not is judged. Specifically, the state of the economizer parameter reflected by the relationship of the economizer parameter to the initial target economizer parameter is used as a measurement reference.
Step 207: and determining whether to adjust the opening of the main electronic expansion valve and the opening of the auxiliary electronic expansion valve based on the exhaust parameters according to the state of the economizer parameters.
The exhaust parameters are not always involved in the adjustment of the opening degrees of the main electronic expansion valve and the auxiliary electronic expansion valve, but are determined whether to use the exhaust parameters to participate in the adjustment of the opening degrees of the valves according to the state of the economizer parameters.
In this embodiment, in the second control process, the state of the economizer parameter is first determined, the determination of the state of the air-make-up auxiliary passage in which the economizer is located is realized based on the state of the economizer parameter, and then it is determined whether or not to take the exhaust parameter as the control parameter to participate in the adjustment of the valve opening according to the state of the economizer parameter. By adopting the control strategy, the valve opening degree is finely regulated based on the economizer parameters and the valve opening degree is finely regulated based on the exhaust parameters, and the valve opening degree is coarsely regulated based on the suction superheat degree, so that the layered-level coupling regulation of the main electronic expansion valve and the auxiliary electronic expansion valve is realized, the regulation precision and the efficiency are further improved, the optimal control of the refrigerant flow of the refrigerant circulation main path and the refrigerant flow of the air supplementing auxiliary path is realized, the refrigerant flows in different flow paths are ensured to reach an optimal state, the unit efficiency is further optimized, and the stable and efficient operation of the unit is ensured.
In some embodiments, the initial target economizer parameter is an initial target economizer superheat when the economizer parameter is an economizer superheat. If the state of the superheat degree of the economizer is not higher than the initial target superheat degree of the economizer, the exhaust parameters participate in the adjustment of the opening degree of the valve, and the process of adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the exhaust parameters is executed; otherwise, the exhaust gas quantity does not take part in the regulation of the valve opening.
In still other embodiments, the initial target economizer parameter is an initial target economizer subcooling degree when the economizer parameter is an economizer subcooling degree. If the state of the supercooling degree of the economizer is not lower than the initial target supercooling degree of the economizer, the exhaust parameters participate in the adjustment of the opening degree of the valve, and the process of adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the exhaust parameters is executed; otherwise, the exhaust gas quantity does not take part in the regulation of the valve opening.
Fig. 3 is a schematic flow chart of a control method of a heat pump unit according to another embodiment of the present invention, specifically, a specific flow chart of performing a second control process on a heat pump unit having a main electronic expansion valve and an auxiliary electronic expansion valve. In this embodiment, first, the method as in the embodiments of fig. 1 and 2 is adopted, coarse adjustment is performed on the opening degree of the main electronic expansion valve based on the suction superheat degree, the suction superheat degree reaches the initial target suction superheat degree, and then a second control process is performed, and the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve are adjusted based on the economizer parameter and the exhaust parameter. Also, in this embodiment, the economizer parameter is the economizer superheat, and the exhaust gas parameter is the exhaust gas superheat or the exhaust gas temperature.
As shown in fig. 3, this embodiment performs the second control process using the following process to achieve adjustment of the opening degree of the main electronic expansion valve and the opening degree of the sub electronic expansion valve.
Step 301: the economizer superheat degree is compared with the initial target economizer superheat degree, a state in which the economizer superheat degree is lower than, up to, or higher than the defrost target economizer superheat degree is determined, and then different controls are performed according to different states.
Step 310: when the economizer superheat is in a state lower than the initial target economizer superheat, the control of steps 311 to 315 is performed. In this state, the exhaust gas parameter participates in the adjustment of the opening degree of the two valves, and different adjustment control strategies are executed based on different states of the exhaust gas parameter.
Step 311: and judging whether the exhaust parameters reach target exhaust parameters. If yes, go to step 312; otherwise, step 313 is performed.
The target exhaust parameter is a preset value, and if the exhaust parameter is the exhaust superheat degree, the target exhaust parameter is the target exhaust superheat degree; if the exhaust parameter is the exhaust temperature, the target exhaust parameter is the target exhaust temperature.
Step 312: the opening degrees of the main electronic expansion valve and the auxiliary electronic expansion valve are kept unchanged.
If step 311 determines that the exhaust parameter reaches the target exhaust parameter, the opening degrees of the main electronic expansion valve and the auxiliary electronic expansion valve are kept unchanged, so as to prevent the exhaust temperature protection from affecting the normal operation of the system.
Step 313: and judging whether the exhaust parameter is higher than the target exhaust parameter. If yes, go to step 314; otherwise, step 315 is performed.
If step 311 determines that the exhaust parameter does not reach the target exhaust parameter, it further determines whether the exhaust parameter is higher than the target exhaust parameter, and executes different controls according to the determination result.
Step 314: increasing the superheat degree of the initial target inspiration and adjusting the opening degree of the main electronic expansion valve; and reducing the superheat degree of the initial target economizer, and adjusting the opening degree of the auxiliary electronic expansion valve.
If it is determined in step 313 that the exhaust parameter is higher than the target exhaust parameter, the initial target intake superheat degree is increased, the increased target intake superheat degree is obtained, and the opening of the main electronic expansion valve is adjusted according to the intake superheat degree and the increased target intake superheat degree, so that the opening of the main electronic expansion valve is reduced, and the exhaust temperature is prevented from being too high.
Meanwhile, the initial target economizer superheat degree is reduced, the reduced target economizer superheat degree is obtained, the opening of the auxiliary electronic expansion valve is adjusted according to the economizer superheat degree and the reduced target economizer superheat degree, the opening of the auxiliary electronic expansion valve is increased, and the compressor is rapidly cooled by means of the increase of the flow of the refrigerant of the air supplementing branch.
Step 315: the opening degree of the main electronic expansion valve is kept unchanged; and increasing the superheat degree of the initial target economizer, and adjusting the opening degree of the auxiliary electronic expansion valve.
If the exhaust parameter is not higher than the target exhaust parameter in step 313, it is determined in combination with the determination in step 311 that the exhaust parameter is lower than the target exhaust parameter. The opening degree of the main electronic expansion valve is kept unchanged, the initial target economizer superheat degree is increased, the increased target economizer superheat degree is obtained, the opening degree of the auxiliary electronic expansion valve is adjusted according to the economizer superheat degree and the increased target economizer superheat degree, the opening degree of the auxiliary electronic expansion valve is reduced, the flow rate of the refrigerant of the air supplementing branch is reduced, and the economizer superheat degree reaches a larger superheat degree.
Step 320: when the economizer superheat degree is in a state of reaching the initial target economizer superheat degree, the control process of steps 321 to 323 is performed. In this state, the exhaust gas quantity also participates in the regulation of the opening of the two valves, and different regulation control strategies are executed based on different states of the exhaust gas quantity.
Step 321: and judging whether the exhaust parameter is higher than the target exhaust parameter. If yes, go to step 322; otherwise, step 323 is performed.
Step 322: increasing the superheat degree of the initial target inspiration and adjusting the opening degree of the main electronic expansion valve; and adjusting the opening of the auxiliary electronic expansion valve according to the initial target economizer superheat degree.
If it is determined in step 321 that the exhaust parameter is higher than the target exhaust parameter, the initial target intake superheat degree is increased, the increased target intake superheat degree is obtained, and the opening of the main electronic expansion valve is adjusted according to the intake superheat degree and the increased target intake superheat degree, so that the opening of the main electronic expansion valve is closed, and the exhaust temperature is prevented from being too high. Meanwhile, since the economizer superheat degree has reached the initial target economizer superheat degree in step 320, the initial target economizer superheat degree is not changed, and the opening of the auxiliary electronic expansion valve is adjusted according to the economizer parameter and the initial target economizer superheat degree, that is, the opening of the auxiliary electronic expansion valve is automatically adjusted according to the initial target economizer superheat degree. At this time, the heat pump unit system capacity reaches an optimal state within the normal operating range.
Step 323: the opening degree of the main electronic expansion valve is kept unchanged; and adjusting the opening of the auxiliary electronic expansion valve according to the initial target economizer superheat degree.
If it is determined in step 321 that the exhaust parameter is not higher than the target exhaust parameter, the opening of the main electronic expansion valve is kept unchanged, and the opening of the auxiliary electronic expansion valve is adjusted according to the superheat degree of the economizer and the initial target superheat degree of the economizer, that is, the opening of the auxiliary electronic expansion valve is automatically adjusted according to the initial target superheat degree of the economizer.
Step 330: when the economizer superheat is in a state higher than the initial target economizer superheat, the control of step 331 is performed.
Step 331: increasing the superheat degree of the initial target inspiration and adjusting the opening degree of the main electronic expansion valve; and reducing the superheat degree of the initial target economizer, and adjusting the opening degree of the auxiliary electronic expansion valve.
In a state where the economizer superheat degree is higher than the initial target economizer superheat degree, the influence of the exhaust gas parameters is not considered, and the opening degree of both valves is adjusted. Specifically, the initial target suction superheat degree is increased, the increased target suction superheat degree is obtained, and the opening of the main electronic expansion valve is adjusted according to the suction superheat degree and the increased target suction superheat degree, so that the opening of the main electronic expansion valve is closed. Meanwhile, the initial target economizer superheat degree is reduced, the reduced target economizer superheat degree is obtained, the opening of the auxiliary electronic expansion valve is adjusted according to the economizer superheat degree and the reduced target economizer superheat degree, the opening of the auxiliary electronic expansion valve is increased, the refrigerant flow of the air supplementing branch is increased, and the heat exchange temperature difference of the economizer is reduced.
It should be understood that the above-described process is a control process of one control cycle, and the above-described process is to be cyclically performed throughout the operation of the heat pump unit.
The above process is described with the economizer superheat as the economizer parameter, which in other embodiments may also be the economizer subcooling. When economizer subcooling is used as the economizer parameter, a portion of the steps in FIG. 3 are adjusted. The method comprises the following steps:
when the economizer supercooling degree is in a state higher than the initial target economizer supercooling degree, the exhaust gas parameter participates in the adjustment of the opening degree of the two valves, and different adjustment control strategies are executed based on different states of the exhaust gas parameter. Specifically, the exhaust gas parameter is first compared with the target exhaust gas parameter, and different controls are executed according to the comparison result. And when the exhaust parameters reach the target exhaust parameters, keeping the opening of the electronic expansion valve and the opening of the auxiliary electronic expansion valve unchanged. When the exhaust parameter is higher than the target exhaust parameter, adjusting the opening of the main electronic expansion valve according to the suction superheat degree and the increased target suction superheat degree; and simultaneously increasing the initial target economizer supercooling degree, obtaining the increased target economizer supercooling degree, and adjusting the opening of the auxiliary electronic expansion valve according to the economizer supercooling degree and the increased target economizer supercooling degree. When the exhaust parameter is lower than the target exhaust parameter, the opening of the main electronic expansion valve is kept unchanged, the initial target economizer supercooling degree is reduced, the reduced target economizer supercooling degree is obtained, and the opening of the auxiliary electronic expansion valve is adjusted according to the economizer supercooling degree and the reduced target economizer supercooling degree.
When the economizer supercooling degree is in a state of reaching the initial target economizer supercooling degree, the exhaust gas parameters also participate in the adjustment of the opening degree of the two valves, and different adjustment control strategies are executed based on different states of the exhaust gas parameters. Specifically, when the exhaust parameter is higher than the target exhaust parameter, increasing the initial target air suction superheat degree, and adjusting the opening of the main electronic expansion valve; and simultaneously, adjusting the opening of the auxiliary electronic expansion valve according to the initial target economizer supercooling degree. And when the exhaust parameter is not higher than the target exhaust parameter, keeping the opening of the main electronic expansion valve unchanged, and adjusting the opening of the auxiliary electronic expansion valve according to the initial target economizer supercooling degree.
When the economizer supercooling degree is higher than the initial target economizer supercooling degree, the two-valve opening degree is adjusted regardless of the influence of the exhaust gas parameter. Specifically, the initial target suction superheat degree is increased, the increased target suction superheat degree is obtained, and the opening of the main electronic expansion valve is adjusted according to the suction superheat degree and the increased target suction superheat degree, so that the opening of the main electronic expansion valve is closed. Meanwhile, the initial target economizer supercooling degree is increased, the increased target economizer supercooling degree is obtained, and the opening degree of the auxiliary electronic expansion valve is adjusted according to the economizer supercooling degree and the increased target economizer supercooling degree.
Fig. 4 is a schematic structural view of an embodiment of the heat pump unit control device according to the present invention. In this embodiment, the heat pump unit includes a main electronic expansion valve provided in the main path of the refrigerant cycle and an auxiliary electronic expansion valve provided in the auxiliary path of the air make-up where the economizer is located. The heat pump unit control device comprises structural units, and functions and relationships among the structural units are specifically described as follows:
the heat pump unit control device includes:
and an intake superheat acquisition unit 41 for acquiring the intake superheat.
An economizer parameter acquisition unit 42 for acquiring an economizer parameter. Wherein the economizer parameter is economizer superheat or economizer subcooling.
An exhaust gas parameter acquisition unit 43 for acquiring an exhaust gas parameter. Wherein the exhaust parameter is the exhaust superheat degree or the exhaust temperature.
And an intake superheat degree judgment unit 44 for judging whether the intake superheat degree acquired by the intake superheat degree acquisition unit 41 reaches the initial target intake superheat degree.
The first processing unit 45 is configured to execute a first control procedure when the output result of the suction superheat degree determining unit 44 is that the suction superheat degree does not reach the initial target suction superheat degree: the opening degree of the main electronic expansion valve is adjusted in accordance with the suction superheat degree acquired by the suction superheat degree acquisition unit 41 and the initial target suction superheat degree.
The second processing unit 46 is configured to execute a second control procedure when the output result of the suction superheat degree determining unit 44 is that the suction superheat degree reaches the initial target suction superheat degree: the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve are adjusted based on the economizer parameter acquired by the economizer parameter acquisition unit 42 and the exhaust parameter acquired by the exhaust parameter acquisition unit 43.
The control device with the structure runs corresponding software programs to execute corresponding functions, and controls the heat pump unit according to the control method embodiment of the heat pump unit and the process of the preferred embodiment of the heat pump unit according to the embodiments of the control method of the heat pump unit shown in fig. 1 to 3, so as to achieve the corresponding technical effects of the method embodiment.
Fig. 5 shows a schematic structural view of an embodiment of the heat pump unit of the present invention. The heat pump unit comprises a processor 51, a memory 52 and a computer program 521 stored on the memory 52, the processor 51 being configured to execute the computer program 521, to implement the control method of the embodiment of the heat pump unit control method of fig. 1 to 3 and the control method of the preferred embodiment thereof, and to implement the technical effects of the corresponding embodiment.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (9)
1. A heat pump unit control method, the heat pump unit including a main electronic expansion valve provided in a refrigerant circulation main path and an auxiliary electronic expansion valve provided in a gas-supplementing auxiliary path where an economizer is located, the method comprising:
the unit operates to acquire the air suction superheat degree, the economizer parameter and the exhaust parameter;
judging whether the suction superheat degree reaches an initial target suction superheat degree or not;
when the suction superheat degree does not reach the initial target suction superheat degree, executing a first control process: adjusting the opening of the main electronic expansion valve according to the suction superheat degree and the initial target suction superheat degree;
and when the suction superheat degree reaches the initial target suction superheat degree, executing a second control process: adjusting the opening of the main electronic expansion valve and the opening of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust parameter;
the economizer parameter is economizer superheat or economizer subcooling; the exhaust parameter is exhaust superheat degree or exhaust temperature;
and adjusting the opening of the main electronic expansion valve and the opening of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust parameter, wherein the method specifically comprises the following steps of:
Comparing the economizer parameter with an initial target economizer parameter to obtain a state of the economizer parameter;
and determining whether to adjust the opening of the main electronic expansion valve and the opening of the auxiliary electronic expansion valve based on the exhaust parameters according to the state of the economizer parameters.
2. The heat pump unit control method according to claim 1, wherein determining whether to adjust the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the exhaust gas parameter according to the state of the economizer parameter, specifically comprises:
when the economizer parameter is the economizer superheat, the initial target economizer parameter is an initial target economizer superheat; if the state of the economizer superheat degree is not higher than the initial target economizer superheat degree, executing a process of adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the exhaust parameter;
when the economizer parameter is the economizer subcooling degree, the initial target economizer parameter is an initial target economizer subcooling degree; and if the state of the economizer supercooling degree is not lower than the initial target economizer supercooling degree, executing a process of adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the exhaust gas parameter.
3. The heat pump unit control method according to claim 2, wherein adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust gas parameter, comprises:
comparing the exhaust gas parameter with a target exhaust gas parameter when the economizer parameter reaches the initial target economizer parameter;
when the exhaust parameter is not higher than the target exhaust parameter, keeping the opening of the main electronic expansion valve unchanged, and adjusting the opening of the auxiliary electronic expansion valve according to the economizer parameter and the initial target economizer parameter;
and when the exhaust parameter is higher than the target exhaust parameter, increasing the initial target air suction superheat degree to obtain an increased target air suction superheat degree, adjusting the opening of the main electronic expansion valve according to the air suction superheat degree and the increased target air suction superheat degree, and adjusting the opening of the auxiliary electronic expansion valve according to the economizer parameter and the initial target economizer parameter.
4. The heat pump unit control method according to claim 2, wherein adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust gas parameter, comprises:
Comparing the exhaust gas parameter with a target exhaust gas parameter when the economizer superheat is less than an initial target economizer superheat;
when the exhaust parameter reaches the target exhaust parameter, keeping the opening of the main electronic expansion valve and the opening of the auxiliary electronic expansion valve unchanged;
when the exhaust parameter is higher than the target exhaust parameter, increasing the initial target air suction superheat degree to obtain an increased target air suction superheat degree, and adjusting the opening of the main electronic expansion valve according to the air suction superheat degree and the increased target air suction superheat degree; simultaneously reducing the initial target economizer superheat degree, obtaining a reduced target economizer superheat degree, and adjusting the opening of the auxiliary electronic expansion valve according to the economizer superheat degree and the reduced target economizer superheat degree;
when the exhaust parameter is lower than the target exhaust parameter, keeping the opening of the main electronic expansion valve unchanged, increasing the initial target economizer superheat degree, obtaining the increased target economizer superheat degree, and adjusting the opening of the auxiliary electronic expansion valve according to the economizer superheat degree and the increased target economizer superheat degree;
Comparing the exhaust gas parameter to the target exhaust gas parameter when the economizer degree of subcooling is greater than an initial target economizer degree of subcooling;
when the exhaust parameter reaches the target exhaust parameter, keeping the opening of the main electronic expansion valve and the opening of the auxiliary electronic expansion valve unchanged;
when the exhaust parameter is higher than the target exhaust parameter, adjusting the opening of the main electronic expansion valve according to the suction superheat degree and the increased target suction superheat degree; simultaneously increasing the initial target economizer supercooling degree to obtain an increased target economizer supercooling degree, and adjusting the opening of the auxiliary electronic expansion valve according to the economizer supercooling degree and the increased target economizer supercooling degree;
and when the exhaust parameter is lower than the target exhaust parameter, keeping the opening of the main electronic expansion valve unchanged, reducing the initial target economizer supercooling degree, obtaining the reduced target economizer supercooling degree, and adjusting the opening of the auxiliary electronic expansion valve according to the economizer supercooling degree and the reduced target economizer supercooling degree.
5. The heat pump unit control method according to claim 2, wherein adjusting the opening degree of the main electronic expansion valve and the opening degree of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust gas parameter, comprises:
When the superheat degree of the economizer is higher than the initial target superheat degree of the economizer, increasing the initial target suction superheat degree to obtain an increased target suction superheat degree, and adjusting the opening of the main electronic expansion valve according to the suction superheat degree and the increased target suction superheat degree; the initial target economizer superheat degree is reduced, the reduced target economizer superheat degree is obtained, and the opening of the auxiliary electronic expansion valve is adjusted according to the economizer superheat degree and the reduced target economizer superheat degree;
when the economizer supercooling degree is lower than the initial target economizer supercooling degree, increasing the initial target air suction superheat degree to obtain an increased target air suction superheat degree, and adjusting the opening of the main electronic expansion valve according to the air suction superheat degree and the increased target air suction superheat degree; and further increasing the initial target economizer supercooling degree, obtaining an increased target economizer supercooling degree, and adjusting the opening degree of the auxiliary electronic expansion valve according to the economizer supercooling degree and the increased target economizer supercooling degree.
6. The heat pump unit control method according to any one of claims 1 to 5, characterized in that the method further comprises:
Before the first control process and the second control process are executed, the opening degree of the main electronic expansion valve is adjusted to an initial main valve opening degree, and the opening degree of the auxiliary electronic expansion valve is adjusted to an initial auxiliary valve opening degree.
7. The heat pump assembly control method of claim 6, further comprising:
and in the first control process, maintaining the opening degree of the auxiliary electronic expansion valve to be the initial auxiliary valve opening degree.
8. A heat pump unit control apparatus including a main electronic expansion valve provided in a refrigerant circulation main path and an auxiliary electronic expansion valve provided in a supplementary air path where an economizer is located, the apparatus comprising:
the air suction superheat degree acquisition unit is used for acquiring the air suction superheat degree;
an economizer parameter acquisition unit configured to acquire an economizer parameter; the economizer parameter is economizer superheat or economizer subcooling;
an exhaust parameter acquisition unit configured to acquire an exhaust parameter; the exhaust parameter is exhaust superheat degree or exhaust temperature;
the air suction superheat degree judging unit is used for judging whether the air suction superheat degree reaches an initial target air suction superheat degree or not;
A first processing unit configured to execute a first control procedure when the suction superheat degree does not reach the initial target suction superheat degree: adjusting the opening of the main electronic expansion valve according to the suction superheat degree and the initial target suction superheat degree;
a second processing unit, configured to execute a second control procedure when the suction superheat degree reaches the initial target suction superheat degree: adjusting the opening of the main electronic expansion valve and the opening of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust parameter;
and adjusting the opening of the main electronic expansion valve and the opening of the auxiliary electronic expansion valve based on the economizer parameter and the exhaust parameter, wherein the method specifically comprises the following steps of:
comparing the economizer parameter with an initial target economizer parameter to obtain a state of the economizer parameter;
and determining whether to adjust the opening of the main electronic expansion valve and the opening of the auxiliary electronic expansion valve based on the exhaust parameters according to the state of the economizer parameters.
9. A heat pump assembly comprising a processor, a memory and a computer program stored on the memory, characterized in that the processor is configured to execute the computer program to implement the heat pump assembly control method according to any one of the preceding claims 1 to 7.
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