Control method of heat pump system, heat pump system and environmental test box

Abstract

The embodiment of the invention discloses a control method of a heat pump system, the heat pump system and an environment test box. The heat pump system comprises a processor, a compressor module, a heat exchanger module, an economizer module and a valve assembly, the valve assembly comprises a reversing valve, at least one electromagnetic valve and at least one electronic expansion valve, and the compressor module comprises at least one compressor and communicates with the heat exchanger module through the reversing valve; the heat exchanger module further communicates with the compressor module through the economizer module, the electromagnetic valve and the electronic expansion valve, the processor is electrically connected with the compressor module and the valve assembly, and the method is executed by the processor. The method comprises the steps that the actual temperature and target temperature of a target area and the environment temperature are acquired; and according to the actual temperature, the target temperature and the environment temperature, the working state of each compressor, the working state of a reversing valve and the working states of each electromagnetic valve and each electronic expansion valve are controlled. According to the technical scheme, energy consumption can be reduced, and the energy utilization rate can be increased.

Description

Technical Field

[0001] The embodiments of the present invention relate to heat pump system technology, and more particularly to a control method of a heat pump system, a heat pump system and an environmental test chamber. Background Art

[0002] Heat pump systems, such as those used in environmental test chambers, heat up or cool down the environmental test chambers. However, when simulating heating conditions or high-temperature environments, environmental test chambers usually use electric heating. Due to the low energy conversion efficiency during electric heating, it will lead to high energy consumption and affect energy utilization. Summary of the invention

[0003] The embodiments of the present invention provide a control method of a heat pump system, a heat pump system and an environmental test chamber to reduce energy consumption and improve energy utilization.

[0004] In a first aspect, an embodiment of the present invention provides a control method for a heat pump system, the heat pump system comprising a processor, a compressor module, a heat exchanger module, an economizer module and a valve assembly, the valve assembly comprising a reversing valve, at least one solenoid valve and at least one electronic expansion valve, the compressor module comprising at least one compressor, the compressor module being connected to the heat exchanger module through the reversing valve, the heat exchanger module being further connected to the compressor module through the economizer module, the solenoid valve and the electronic expansion valve, the processor being electrically connected to the compressor module and the valve assembly, and the control method being executed by the processor; the control method comprising:

[0005] Obtain the actual temperature and target temperature of the target area as well as the ambient temperature;

[0006] According to the actual temperature, the target temperature and the ambient temperature, the working state of each compressor, the working state of the reversing valve, the working state of each solenoid valve and the working state of each electronic expansion valve are controlled.

[0007] Optionally, the compressor module includes a medium-temperature compressor, the heat exchanger module includes an outer heat exchanger and an inner first heat exchanger, the economizer module includes a medium-temperature economizer, the reversing valve is a four-way reversing valve, and the valve assembly includes a medium-temperature jet solenoid valve, a medium-temperature main circuit solenoid valve, a medium-temperature jet electronic expansion valve, a medium-temperature main circuit electronic expansion valve, and a one-way valve assembly; the exhaust port of the medium-temperature compressor is connected to the outer heat exchanger through the first end and the second end of the four-way reversing valve in sequence, and the outer heat exchanger is connected to the outer heat exchanger through the one-way valve The assembly is communicated with the medium-temperature economizer, the medium-temperature economizer is communicated with the inner first heat exchanger through the medium-temperature main circuit solenoid valve, the medium-temperature main circuit electronic expansion valve, and the one-way valve assembly in sequence, the medium-temperature economizer is communicated with the injection port of the medium-temperature compressor, the medium-temperature economizer is communicated with itself through the pipeline where the medium-temperature jet solenoid valve and the medium-temperature jet electronic expansion valve are located, and the inner first heat exchanger is communicated with the suction port of the medium-temperature compressor through the third end and the fourth end of the four-way reversing valve in sequence;

[0008] The controlling the working state of each compressor, the working state of the reversing valve, the working state of each solenoid valve and the working state of each electronic expansion valve according to the actual temperature, the target temperature and the ambient temperature includes:

[0009] When the target temperature is between the preset single-pressure minimum evaporation temperature and the ambient temperature and the target temperature is lower than or equal to the actual temperature, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve is opened, and the four-way reversing valve is switched to the cooling mode, and the preset single-pressure minimum evaporation temperature is lower than the ambient temperature;

[0010] When the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve is opened, and the four-way reversing valve is switched to a heating mode, and the preset single-pressure maximum condensing temperature is higher than the ambient temperature;

[0011] When the target temperature is higher than the preset single-pressure maximum condensing temperature, the medium-temperature stage compressor is controlled to be turned off.

[0012] Optionally, the compressor module also includes a low-temperature compressor, the heat exchanger module also includes an inner second heat exchanger, a medium-temperature-low-temperature evaporative condenser, and a precooler, the economizer module also includes a low-temperature economizer, and the valve assembly also includes a medium-temperature switching solenoid valve, a low-temperature switching solenoid valve, a low-temperature jet solenoid valve, a low-temperature jet electronic expansion valve, a low-temperature main circuit solenoid valve, and a low-temperature main circuit electronic expansion valve; the exhaust port of the low-temperature compressor, the precooler, the medium-temperature-low-temperature evaporative condenser, the low-temperature economizer, the inner second heat exchanger, and the air intake port of the low-temperature compressor The low-temperature economizer is connected in sequence, the low-temperature economizer is connected with itself through the pipeline where the low-temperature jet electronic expansion valve and the low-temperature jet solenoid valve are located, the low-temperature economizer is connected with the injection port of the low-temperature compressor, the low-temperature economizer is connected with the inner second heat exchanger in sequence through the low-temperature main circuit solenoid valve and the low-temperature main circuit electronic expansion valve, the medium-temperature-low-temperature evaporative condenser is connected with the one-way valve assembly through the low-temperature switching solenoid valve, and the medium-temperature-low-temperature evaporative condenser is connected with the suction port of the medium-temperature compressor in sequence through the third end and the fourth end of the four-way reversing valve;

[0013] The controlling the working state of each compressor, the working state of the reversing valve, the working state of each solenoid valve and the working state of each electronic expansion valve according to the actual temperature, the target temperature and the ambient temperature includes:

[0014] When the target temperature is between the preset cascade minimum evaporation temperature and the preset single-pressure minimum evaporation temperature and the target temperature is lower than or equal to the actual temperature, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are opened, the four-way reversing valve is in cooling mode, the medium-temperature switching solenoid valve is closed, the low-temperature switching solenoid valve is opened, the low-temperature compressor is started, each solenoid valve and each electronic expansion valve of the low-temperature stage are opened, and the preset cascade minimum evaporation temperature is lower than the preset single-pressure minimum evaporation temperature;

[0015] When the target temperature is between the preset single-pressure minimum evaporation temperature and the ambient temperature and the target temperature is lower than or equal to the actual temperature, if the single-pressure refrigeration mode is selected, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are opened, the four-way reversing valve is in refrigeration mode, the medium-temperature switching solenoid valve is opened, the low-temperature switching solenoid valve is closed, the low-temperature compressor is closed, and each solenoid valve and each electronic expansion valve of the low-temperature stage are closed;

[0016] When the target temperature is between the preset single-pressure minimum evaporating temperature and the ambient temperature and the target temperature is lower than or equal to the actual temperature, if the cascade refrigeration mode is selected, the medium-temperature stage compressor is controlled to start, the medium-temperature stage solenoid valves and the medium-temperature stage electronic expansion valves are opened, the four-way reversing valve is in refrigeration mode, the medium-temperature stage switching solenoid valve is closed, the low-temperature stage switching solenoid valve is opened, the low-temperature stage compressor is started, and the low-temperature stage solenoid valves and the low-temperature stage electronic expansion valves are opened.

[0017] Optionally, the control method further includes:

[0018] When the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are opened, the four-way reversing valve is in heating mode, the medium-temperature switching solenoid valve is opened, the low-temperature switching solenoid valve is closed, the low-temperature compressor is closed, and each solenoid valve and each electronic expansion valve of the low-temperature stage are closed;

[0019] When the target temperature is higher than the preset single-pressure maximum condensing temperature, each compressor is controlled to be turned off.

[0020] Optionally, the compressor module also includes a high-temperature compressor, the heat exchanger module also includes an inner third heat exchanger, a medium-temperature-high-temperature evaporative condenser, the economizer module also includes a high-temperature economizer, and the valve assembly also includes a medium-temperature switching solenoid valve, a high-temperature switching solenoid valve, a high-temperature jet solenoid valve, a high-temperature jet electronic expansion valve, a high-temperature main circuit solenoid valve, and a high-temperature main circuit electronic expansion valve; the exhaust port of the high-temperature compressor, the inner third heat exchanger, the high-temperature economizer, and the injection port of the high-temperature compressor are connected in sequence, and the high-temperature economizer is connected through the high-temperature The medium-temperature-high-temperature-level evaporative condenser is connected to the medium-temperature-high-temperature-level evaporative condenser through the high-temperature-level main circuit solenoid valve and the high-temperature-level main circuit electronic expansion valve in sequence, and the medium-temperature-high-temperature-level evaporative condenser is connected to the one-way valve assembly through the high-temperature-level switching solenoid valve, and the medium-temperature-high-temperature-level evaporative condenser is connected to the exhaust port of the medium-temperature-level compressor through the fourth end and the first end of the four-way reversing valve in sequence, and the medium-temperature-high-temperature-level evaporative condenser is connected to the air intake port of the high-temperature-level compressor;

[0021] The controlling the working state of each compressor, the working state of the reversing valve, the working state of each solenoid valve and the working state of each electronic expansion valve according to the actual temperature, the target temperature and the ambient temperature includes:

[0022] When the target temperature is between the preset single-pressure minimum evaporation temperature and the ambient temperature and the target temperature is lower than or equal to the actual temperature, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are opened, the four-way reversing valve is in cooling mode, the medium-temperature switching solenoid valve is opened, the high-temperature switching solenoid valve is closed, the high-temperature compressor is closed, and each solenoid valve and each electronic expansion valve of the high-temperature stage are closed;

[0023] When the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, if the single-pressure heating mode is selected, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are opened, the four-way reversing valve is in heating mode, the medium-temperature switching solenoid valve is opened, the high-temperature switching solenoid valve is closed, the high-temperature compressor is closed, and each solenoid valve and each electronic expansion valve of the high-temperature stage are closed;

[0024] When the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, if the cascade heating mode is selected, the medium-temperature stage compressor is controlled to start, the medium-temperature stage solenoid valves and the medium-temperature stage electronic expansion valves are opened, the four-way reversing valve is in heating mode, the medium-temperature stage switching solenoid valve is closed, the high-temperature stage switching solenoid valve is opened, the high-temperature stage compressor is started, and the high-temperature stage solenoid valves and the high-temperature stage electronic expansion valves are opened.

[0025] Optionally, the control method further includes:

[0026] When the target temperature is between the preset single-pressure maximum condensing temperature and the preset cascade maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are opened, the four-way reversing valve is in heating mode, the medium-temperature switching solenoid valve is closed, the high-temperature switching solenoid valve is opened, the high-temperature compressor is started, each solenoid valve and each electronic expansion valve of the high-temperature stage are opened, and the preset single-pressure maximum condensing temperature is lower than the preset cascade maximum condensing temperature;

[0027] When the target temperature is higher than the preset cascade maximum condensing temperature, each compressor is controlled to be turned off.

[0028] Optionally, the compressor module also includes a low-temperature compressor and a high-temperature compressor, the heat exchanger module also includes an inner second heat exchanger, an inner third heat exchanger, a medium-temperature-low-temperature evaporative condenser, a medium-temperature-high-temperature evaporative condenser, and a precooler, the economizer module also includes a low-temperature economizer and a high-temperature economizer, and the valve assembly also includes a medium-temperature switching solenoid valve, a low-temperature switching solenoid valve, a low-temperature jet solenoid valve, a low-temperature jet electronic expansion valve, a low-temperature main circuit solenoid valve, a low-temperature main circuit electronic expansion valve, a high-temperature switching solenoid valve, a high-temperature jet solenoid valve, high-temperature jet electronic expansion valve, high-temperature main circuit solenoid valve, high-temperature main circuit electronic expansion valve; the exhaust port of the low-temperature compressor, the precooler, the medium-temperature-low-temperature evaporative condenser, the low-temperature economizer, the inner second heat exchanger, and the air intake port of the low-temperature compressor are connected in sequence, the low-temperature economizer is connected to itself through the low-temperature jet electronic expansion valve and the pipeline where the low-temperature jet solenoid valve is located, the low-temperature economizer is connected to the injection port of the low-temperature compressor, and the low-temperature economizer is connected in sequence through the low-temperature The main circuit solenoid valve and the low-temperature main circuit electronic expansion valve are connected to the inner second heat exchanger, the medium-temperature-low-temperature evaporative condenser is connected to the one-way valve assembly through the low-temperature switching solenoid valve, and the medium-temperature-low-temperature evaporative condenser is connected to the suction port of the medium-temperature compressor through the third end and the fourth end of the four-way reversing valve in sequence; the exhaust port of the high-temperature compressor, the inner third heat exchanger, the high-temperature economizer, and the injection port of the high-temperature compressor are connected in sequence, and the high-temperature economizer is connected to the high-temperature injection solenoid valve and the The pipeline where the high-temperature-stage jet electronic expansion valve is located is connected to itself, the high-temperature-stage economizer is connected to the medium-temperature-high-temperature-stage evaporative condenser through the high-temperature-stage main circuit solenoid valve and the high-temperature-stage main circuit electronic expansion valve in sequence, the medium-temperature-high-temperature-stage evaporative condenser is connected to the one-way valve assembly through the high-temperature-stage switching solenoid valve, the medium-temperature-high-temperature-stage evaporative condenser is connected to the exhaust port of the medium-temperature-stage compressor through the fourth end and the first end of the four-way reversing valve in sequence, and the medium-temperature-high-temperature-stage evaporative condenser is connected to the air intake port of the high-temperature-stage compressor;

[0029] The controlling the working state of each compressor, the working state of the reversing valve, the working state of each solenoid valve and the working state of each electronic expansion valve according to the actual temperature, the target temperature and the ambient temperature includes:

[0030] When the target temperature is between the preset cascade minimum evaporation temperature and the preset single-pressure minimum evaporation temperature and the target temperature is lower than or equal to the actual temperature, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are opened, the four-way reversing valve is in cooling mode, the medium-temperature switching solenoid valve is closed, the low-temperature switching solenoid valve is opened, the high-temperature switching solenoid valve is closed, the low-temperature compressor is started, the high-temperature compressor is closed, each solenoid valve and each electronic expansion valve of the low-temperature stage are opened, each solenoid valve and each electronic expansion valve of the high-temperature stage are closed, and the preset cascade minimum evaporation temperature is lower than the preset single-pressure minimum evaporation temperature;

[0031] When the target temperature is between the preset single-pressure minimum evaporation temperature and the ambient temperature and the target temperature is lower than or equal to the actual temperature, if the single-pressure refrigeration mode is selected, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are opened, the four-way reversing valve is in refrigeration mode, the medium-temperature switching solenoid valve is opened, the low-temperature switching solenoid valve is closed, the high-temperature switching solenoid valve is closed, the low-temperature compressor is closed, the high-temperature compressor is closed, each solenoid valve of the low-temperature stage and each electronic expansion valve of the low-temperature stage are closed, and each solenoid valve of the high-temperature stage and each electronic expansion valve of the high-temperature stage are closed;

[0032] When the target temperature is between the preset single-pressure minimum evaporation temperature and the ambient temperature and the target temperature is lower than or equal to the actual temperature, if the cascade refrigeration mode is selected, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are opened, the four-way reversing valve is in refrigeration mode, the medium-temperature switching solenoid valve is closed, the low-temperature switching solenoid valve is opened, the high-temperature switching solenoid valve is closed, the low-temperature compressor is started, the high-temperature compressor is closed, each solenoid valve and each electronic expansion valve of the low-temperature stage are opened, and each solenoid valve and each electronic expansion valve of the high-temperature stage are closed;

[0033] When the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, if the single-pressure heating mode is selected, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are opened, the four-way reversing valve is in heating mode, the medium-temperature switching solenoid valve is opened, the low-temperature switching solenoid valve is closed, the high-temperature switching solenoid valve is closed, the low-temperature compressor is closed, the high-temperature compressor is closed, each solenoid valve of the low-temperature stage and each electronic expansion valve of the low-temperature stage are closed, and each solenoid valve of the high-temperature stage and each electronic expansion valve of the high-temperature stage are closed;

[0034] When the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, if the cascade heating mode is selected, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are opened, the four-way reversing valve is in heating mode, the medium-temperature switching solenoid valve is closed, the low-temperature switching solenoid valve is closed, the high-temperature switching solenoid valve is opened, the high-temperature compressor is started, the low-temperature compressor is closed, each solenoid valve and each electronic expansion valve of the high-temperature stage are opened, and each solenoid valve and each electronic expansion valve of the low-temperature stage are closed;

[0035] When the target temperature is between the preset single-pressure maximum condensing temperature and the preset cascade maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are opened, the four-way reversing valve is in heating mode, the medium-temperature switching solenoid valve is closed, the low-temperature switching solenoid valve is closed, the high-temperature switching solenoid valve is opened, the high-temperature compressor is started, the low-temperature compressor is closed, each solenoid valve and each electronic expansion valve of the high-temperature stage are opened, each solenoid valve and each electronic expansion valve of the low-temperature stage are closed, and the preset single-pressure maximum condensing temperature is lower than the preset cascade maximum condensing temperature;

[0036] When the target temperature is higher than the preset cascade maximum condensing temperature, each compressor is controlled to be turned off.

[0037] In a second aspect, an embodiment of the present invention provides a heat pump system, comprising: a processor, a compressor module, a heat exchanger module, an economizer module and a valve assembly, wherein the valve assembly comprises a reversing valve, at least one solenoid valve and at least one electronic expansion valve, the compressor module comprises at least one compressor, the compressor module is connected to the heat exchanger module via the reversing valve, the heat exchanger module is also connected to the compressor module via the economizer module, the solenoid valve and the electronic expansion valve, the processor is electrically connected to the compressor module and the valve assembly, and the control method as described in the first aspect is executed by the processor.

[0038] Optionally, the compressor module includes a medium-temperature compressor, the heat exchanger module includes an outer heat exchanger and an inner first heat exchanger, the economizer module includes a medium-temperature economizer, the reversing valve is a four-way reversing valve, and the valve assembly includes a medium-temperature jet solenoid valve, a medium-temperature main circuit solenoid valve, a medium-temperature jet electronic expansion valve, a medium-temperature main circuit electronic expansion valve, and a one-way valve assembly;

[0039] The compressor module also includes a low-temperature compressor, the heat exchanger module also includes an inner second heat exchanger, a medium-temperature-low-temperature evaporative condenser, and a precooler, the economizer module also includes a low-temperature economizer, and the valve assembly also includes a medium-temperature switching solenoid valve, a low-temperature switching solenoid valve, a low-temperature jet solenoid valve, a low-temperature jet electronic expansion valve, a low-temperature main circuit solenoid valve, and a low-temperature main circuit electronic expansion valve; or, the compressor module also includes a high-temperature compressor, the heat exchanger module also includes an inner third heat exchanger, a medium-temperature-high-temperature evaporative condenser, the economizer module also includes a high-temperature economizer, the valve assembly also includes a medium-temperature switching solenoid valve, a high-temperature switching solenoid valve, a high-temperature jet solenoid valve, a high-temperature jet electronic expansion valve, a high-temperature main circuit solenoid valve, and a high-temperature main circuit electronic expansion valve; or, the compressor module also includes a low-temperature compressor and a high-temperature compressor.

[0040] In a third aspect, an embodiment of the present invention provides an environmental test chamber, comprising: a heat pump system as described in the second aspect.

[0041] The embodiments of the present invention provide a control method for a heat pump system, a heat pump system and an environmental test chamber. The heat pump system includes a processor, a compressor module, a heat exchanger module, an economizer module and a valve assembly. The valve assembly includes a reversing valve, at least one solenoid valve and at least one electronic expansion valve. The compressor module includes at least one compressor. The compressor module is connected to the heat exchanger module through a reversing valve. The heat exchanger module is also connected to the compressor module through the economizer module, the solenoid valve and the electronic expansion valve. The processor is electrically connected to the compressor module and the valve assembly. The control method is executed by the processor. The control method includes: obtaining the actual temperature, target temperature and ambient temperature of the target area; and controlling the working state of each compressor, the working state of the reversing valve, the working state of each solenoid valve and the working state of each electronic expansion valve according to the actual temperature, the target temperature and the ambient temperature. The control method of the heat pump system, the heat pump system and the environmental test chamber provided by the embodiments of the present invention control the working state of each compressor, the working state of the reversing valve, the working state of each solenoid valve and the working state of each electronic expansion valve according to the actual temperature, the target temperature and the ambient temperature. For example, when the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, the compressor is controlled to start, each solenoid valve and each electronic expansion valve is opened, and the four-way reversing valve is switched to the heating mode, so as to control the temperature of the environmental test chamber, thereby solving the problem of high energy consumption caused by the use of electric heating when the environmental test chamber simulates a high-temperature environment, thereby reducing energy consumption and improving energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a flow chart of a control method for a heat pump system provided in Embodiment 1 of the present invention;

[0043] Figure 2 is a structural schematic diagram of a heat pump system provided in Embodiment 1 of the present invention;

[0044] Figure 3 is a flow chart of a control method for a heat pump system provided in Embodiment 2 of the present invention;

[0045] Figure 4 is a structural schematic diagram of a heat pump system provided by Embodiment 2 of the present invention;

[0046] Figure 5 is a flow chart of a control method for a heat pump system provided in Embodiment 3 of the present invention;

[0047] Figure 6 is a structural schematic diagram of a heat pump system provided by Embodiment 3 of the present invention;

[0048] Figure 7 is a flow chart of a control method for a heat pump system provided in Embodiment 4 of the present invention;

[0049] Figure 8 is a structural schematic diagram of a heat pump system provided by Embodiment 4 of the present invention;

[0050] Fig. 9 is a flow chart of another control method of a heat pump system provided in Embodiment 4 of the present invention;

[0051] Fig.10 is a structural block diagram of a control device for a heat pump system provided in Embodiment 5 of the present invention;

[0052] Fig.11 It is a structural schematic diagram of an electronic device provided in Embodiment 6 of the present invention. DETAILED DESCRIPTION

[0053] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0054] Embodiment 1

[0055] Figure 11 is a flow chart of a control method for a heat pump system provided in the first embodiment of the present invention. The present embodiment can be applied to aspects of controlling a heat pump system. The heat pump system includes a processor, a compressor module, a heat exchanger module, an economizer module and a valve assembly. The valve assembly includes a reversing valve, at least one solenoid valve and at least one electronic expansion valve. The compressor module includes at least one compressor. The compressor module is connected to the heat exchanger module through the reversing valve. The heat exchanger module is also connected to the compressor module through the economizer module, the solenoid valve and the electronic expansion valve. The processor is electrically connected to the compressor module and the valve assembly. The method can be executed by a processor of the heat pump system. The processor can be implemented in the form of software and / or hardware. The method specifically includes the following steps:

[0056] Step 110: Acquire the actual temperature, target temperature and ambient temperature of the target area.

[0057] The target area may be a test area of ​​an environmental test chamber, and the heat pump system heats or cools the test area of ​​the environmental test chamber. The target temperature of the target area may be input in advance, and the target area and the external environment where the target area is located may be provided with temperature sensors. The processor of the heat pump system is electrically connected to each temperature sensor to obtain the actual temperature of the target area and the ambient temperature.

[0058] For example, Figure 2 Schematic diagram of a heat pump system provided by the first embodiment of the present invention. Figure 2 The compressor module includes a medium-temperature compressor 1, the heat exchanger module includes an outer heat exchanger 3 and an inner first heat exchanger 10, the economizer module includes a medium-temperature economizer 5, the reversing valve is a four-way reversing valve 2, and the valve assembly includes a medium-temperature jet solenoid valve 6, a medium-temperature jet electronic expansion valve 7, a medium-temperature main circuit solenoid valve 8, a medium-temperature main circuit electronic expansion valve 9, and a one-way valve assembly 4; the exhaust port of the medium-temperature compressor 1 is connected to the outer heat exchanger 3 through the first end and the second end of the four-way reversing valve 2 in sequence, and the outer heat exchanger 3 is connected to the medium-temperature economizer 5 through the one-way valve assembly 4, and the medium-temperature economizer The heat exchanger 5 is connected with the first inner heat exchanger 10 through the medium-temperature main circuit solenoid valve 8, the medium-temperature main circuit electronic expansion valve 9, and the one-way valve assembly 4 in sequence. The medium-temperature economizer 5 is connected with the injection port of the medium-temperature compressor 1. The medium-temperature economizer 5 is connected with itself through the pipeline where the medium-temperature jet electronic expansion valve 7 and the medium-temperature jet solenoid valve 6 are located. The first inner heat exchanger 10 is connected with the suction port of the medium-temperature compressor 1 through the third end and the fourth end of the four-way reversing valve 2 in sequence; the processor (not shown in the figure) is electrically connected with the medium-temperature compressor 1, the four-way reversing valve 2, each electronic expansion valve and each solenoid valve.

[0059] Specifically, Figure 2The middle check valve assembly 4 includes four check valves 4 (a), 4 (b), 4 (c), and 4 (d). The outer heat exchanger 3 is connected to the first inlet of the medium-temperature economizer 5 through one of the check valves 4 (a) of the check valve assembly 4. The first outlet of the medium-temperature economizer 5 is connected to the second inlet of the medium-temperature economizer 5 through the medium-temperature jet solenoid valve 6 and the medium-temperature jet electronic expansion valve 7 in sequence. The second outlet of the medium-temperature economizer 5 is connected to the injection port of the medium-temperature compressor 1. The first outlet of the medium-temperature economizer 5 is connected to the injection port of the medium-temperature compressor 1. The first outlet of the medium-temperature economizer 5 is connected to the outer heat exchanger 3 through the medium-temperature main circuit solenoid valve 8, the medium-temperature main circuit electronic expansion valve 9 and the one-way valve 4(d) in turn. The first heat exchanger 10 is connected to the first inlet of the medium-temperature economizer 5 through the one-way valve 4(c). The first (second) inlet of the medium-temperature economizer 5 is connected to its own first (second) outlet.

[0060] Furthermore, the working modes of the heat pump system include a single-pressure cooling mode and a single-pressure heating mode. Figure 2 When the heat pump system works in the single-pressure cooling mode, the gaseous refrigerant is compressed by the medium-temperature compressor 1, and enters the external heat exchanger 3 from the exhaust port of the medium-temperature compressor 1 through the first end and the second end of the four-way reversing valve 2 to condense and release heat. The condensed refrigerant enters the medium-temperature economizer 5 through the one-way valve 4 (a) to achieve supercooling. A part of the supercooled refrigerant is throttled by the medium-temperature jet electronic expansion valve 7 and enters the medium-temperature economizer 5 again to evaporate and absorb heat, and finally returns to the injection port of the medium-temperature compressor 1. Another part of the supercooled refrigerant is throttled by the medium-temperature main circuit electronic expansion valve 9, enters the inner first heat exchanger 10 through the one-way valve 4 (b) to evaporate and absorb heat, and finally returns to the suction port of the medium-temperature compressor 1 through the third end and the fourth end of the four-way reversing valve 2. When the heat pump system operates in the single-pressure heating mode, the gaseous refrigerant is compressed by the medium-temperature compressor 1, enters the first end and the third end of the four-way reversing valve 2 from the exhaust port of the medium-temperature compressor 1, and then enters the inner first heat exchanger 10 to condense and release heat. The condensed refrigerant enters the medium-temperature economizer 5 through the one-way valve 4 (c) to achieve supercooling. A part of the supercooled refrigerant is throttled by the medium-temperature jet electronic expansion valve 7 and enters the medium-temperature economizer 5 again to evaporate and absorb heat, and finally returns to the injection port of the medium-temperature compressor 1. Another part of the supercooled refrigerant is throttled by the medium-temperature main circuit electronic expansion valve 9, enters the outer heat exchanger 3 through the one-way valve 4 (d) to evaporate and absorb heat, and finally returns to the suction port of the medium-temperature compressor 1 through the second end and the fourth end of the four-way reversing valve 2.

[0061] In this embodiment, the low temperature and high temperature environments that the heat pump system can simulate for the environmental test box are determined by the refrigerant used in the medium temperature cycle. Specifically, the lower limit of the low temperature that the heat pump system can simulate is determined by the lowest evaporation temperature that the refrigerant can achieve in the medium temperature cycle, and the upper limit of the high temperature that the heat pump system can simulate is determined by the highest condensation temperature that the refrigerant can achieve in the medium temperature cycle. The refrigerant used in the medium temperature cycle can be at least one of R717, R12, R22, R404A, R407C, R410A, R448A, and R502. By selecting a suitable refrigerant, a low temperature below -40°C or a high temperature above 50°C can be achieved in the test area of ​​the environmental test box.

[0062] Step 120: Control the working state of each compressor, the working state of the reversing valve, the working state of each solenoid valve and the working state of each electronic expansion valve according to the actual temperature, the target temperature and the ambient temperature.

[0063] Specifically, the working state of each compressor, the working state of the reversing valve, the working state of each solenoid valve and each electronic expansion valve are controlled according to the actual temperature, the target temperature, the ambient temperature and the preset temperature, wherein the preset temperature includes the preset single pressure minimum evaporation temperature and the preset single pressure maximum condensation temperature. Figure 2 When the target temperature is between the preset single-pressure minimum evaporation temperature and the ambient temperature and the target temperature is lower than or equal to the actual temperature (the preset single-pressure minimum evaporation temperature is lower than the ambient temperature and the preset single-pressure minimum evaporation temperature is known), the processor selects the single-pressure cooling mode, controls the medium-temperature compressor to start, opens each solenoid valve and each electronic expansion valve, and switches the four-way reversing valve to the cooling mode. Figure 2 The solid arrow in the middle indicates the state of the four-way reversing valve corresponding to the flow direction. In addition, electric heating can be used for auxiliary temperature control according to the actual temperature. When the target temperature is between the preset single-pressure minimum evaporation temperature and the ambient temperature and the target temperature is higher than the actual temperature, the processor selects the single-pressure heating mode, controls the medium-temperature compressor to start, opens each solenoid valve and each electronic expansion valve, and switches the four-way reversing valve to the heating mode. Figure 2 The hollow arrow indicates the state of the four-way reversing valve corresponding to the flow direction; when the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is lower than the actual temperature (the preset single-pressure maximum condensing temperature is higher than the ambient temperature, and the single-pressure maximum condensing temperature is known), the processor selects the single-pressure cooling mode; when the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, the processor selects the single-pressure heating mode; when the target temperature is higher than the preset single-pressure maximum condensing temperature, the medium-temperature compressor is controlled to be turned off, and electric heating can be used for temperature control. In addition, when the required cooling or heating load of the target area is small, the medium-temperature jet solenoid valve is closed. Among them, the specific opening of each electronic expansion valve can be controlled according to the actual working state of the heat pump system, which is not limited here.

[0064] It should be noted that the size of each parameter in this embodiment can be determined according to actual control requirements and is not limited here.

[0065] The control method of the heat pump system provided in the present embodiment controls the working state of each compressor, the working state of the reversing valve, the working state of each solenoid valve and the working state of each electronic expansion valve according to the actual temperature, the target temperature and the ambient temperature. For example, when the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, the compressor is controlled to start, each solenoid valve and each electronic expansion valve is opened, and the four-way reversing valve is switched to the heating mode, so as to control the temperature of the environmental test chamber, thereby solving the problem of high energy consumption caused by the use of electric heating when the environmental test chamber simulates a high-temperature environment, thereby reducing energy consumption and improving energy utilization.

[0066] Embodiment 2

[0067] Figure 3 : is a flow chart of a control method for a heat pump system provided in the second embodiment of the present invention. This embodiment is based on the first embodiment. The method can be executed by a processor of the heat pump system. The processor can be implemented in the form of software and / or hardware. The method specifically includes the following steps:

[0068] Step 210: Acquire the actual temperature, target temperature and ambient temperature of the target area.

[0069] The target area may be a test area of ​​an environmental test chamber, and the heat pump system heats or cools the test area of ​​the environmental test chamber. The target temperature of the target area may be input in advance, and the target area and the external environment where the target area is located may be provided with temperature sensors. The processor of the heat pump system is electrically connected to each temperature sensor to obtain the actual temperature of the target area and the ambient temperature.

[0070] For example, Figure 4 Schematic diagram of a heat pump system provided by Embodiment 2 of the present invention. Figure 2 and Figure 4The compressor module also includes a low-temperature compressor 14, the heat exchanger module also includes a medium-temperature-low-temperature evaporative condenser 13, a precooler 15, and an inner second heat exchanger 21, the economizer module also includes a low-temperature economizer 16, and the valve assembly also includes a medium-temperature switching solenoid valve 11, a low-temperature switching solenoid valve 12, a low-temperature jet solenoid valve 17, a low-temperature jet electronic expansion valve 18, a low-temperature main circuit solenoid valve 19, and a low-temperature main circuit electronic expansion valve 20; the exhaust port of the low-temperature compressor 14, the precooler 15, the first inlet and the first outlet of the medium-temperature-low-temperature evaporative condenser 13, the first inlet and the first outlet of the low-temperature economizer 16, the inner second heat exchanger 21, and the air intake port of the low-temperature compressor 14 are connected in sequence, and the low-temperature The economizer 16 is connected to itself through the pipeline where the low-temperature jet solenoid valve 17 and the low-temperature jet electronic expansion valve 18 are located. The low-temperature economizer 16 is connected to the injection port of the low-temperature compressor 14. The low-temperature economizer 16 is connected to the inner second heat exchanger 21 through the low-temperature main circuit solenoid valve 19 and the low-temperature main circuit electronic expansion valve 20 in turn. The second inlet of the medium-temperature-low-temperature evaporative condenser 13 is connected to the check valve assembly 4 through the low-temperature switching solenoid valve 12, and the second outlet of the medium-temperature-low-temperature evaporative condenser 13 is connected to the air intake port of the medium-temperature compressor 1 through the third end and the fourth end of the four-way reversing valve 2 in turn; the processor (not shown in the figure) is electrically connected to each compressor, the four-way reversing valve 2, each electronic expansion valve and each solenoid valve. Specifically, the second inlet of the medium-temperature-low-temperature evaporative condenser 13 is connected to the first inlet of the medium-temperature economizer 5 through the low-temperature switching solenoid valve 12 and the check valve 4 (c) in turn. The first outlet of the low-temperature stage economizer 16 is connected to the second inlet of the low-temperature stage economizer 16 through the low-temperature stage jet solenoid valve 17 and the low-temperature stage jet electronic expansion valve 18 in sequence, and the second outlet of the low-temperature stage economizer 16 is connected to the jet port of the low-temperature stage compressor 14. The first (second) inlet of the low-temperature stage economizer 16 is connected to the first (second) outlet thereof, and the first (second) inlet of the medium-temperature stage-low-temperature stage evaporative condenser 13 is connected to the first (second) outlet thereof.

[0071] The working modes of the heat pump system in this embodiment include single-pressure refrigeration and single-pressure heating modes, and also include cascade refrigeration mode. When the heat pump system works in the cascade refrigeration mode, the test area of ​​the environmental test box can obtain a lower box temperature. In the cascade refrigeration mode, in the medium-temperature cycle, the gaseous refrigerant is compressed by the medium-temperature compressor 1, enters the first end and the second end of the four-way reversing valve 2 from the exhaust port of the medium-temperature compressor 1, and then enters the external heat exchanger 3 to condense and release heat. The condensed refrigerant enters the medium-temperature economizer 5 through the one-way valve 4 (a) to achieve supercooling. A part of the supercooled refrigerant is throttled by the medium-temperature jet electronic expansion valve 7 and enters the medium-temperature economizer 5 again to evaporate and absorb heat, and finally returns to the injection port of the medium-temperature compressor 1. Another part of the supercooled refrigerant is throttled by the medium-temperature main circuit electronic expansion valve 9, enters the medium-temperature-low temperature evaporative condenser 13 through the one-way valve 4 (b) to evaporate and absorb heat, and finally returns to the suction port of the medium-temperature compressor 1 through the third end and the fourth end of the four-way reversing valve 2. In the low-temperature cycle, the gaseous refrigerant is compressed by the low-temperature compressor 14, enters the precooler 15 from the exhaust port of the low-temperature compressor 14 to cool and release heat, and then enters the medium-temperature-low-temperature evaporative condenser 13 to condense and release heat. The condensed refrigerant enters the low-temperature economizer 16 to achieve supercooling. A part of the supercooled refrigerant is throttled by the low-temperature jet electronic expansion valve 18 and enters the low-temperature economizer 16 again to evaporate and absorb heat, and finally returns to the injection port of the low-temperature compressor 14. Another part of the supercooled refrigerant is throttled by the low-temperature main circuit electronic expansion valve 20, enters the inner second heat exchanger 21 to evaporate and absorb heat, and finally returns to the intake port of the low-temperature compressor 14.

[0072] In this embodiment, the extremely low temperature environment that the heat pump system can simulate for the environmental test box is determined by the refrigerant used in the low temperature cycle. Specifically, the lower limit of the extremely low temperature that the heat pump system can simulate is determined by the lowest evaporation temperature that the refrigerant can achieve in the low temperature cycle. The refrigerant used in the low temperature cycle includes at least one of R170, R1150, R13, R23, and R503. By selecting a suitable refrigerant, a low temperature below -80°C can be achieved in the test area of ​​the environmental test box.

[0073] Step 220: When the target temperature is between the preset cascade minimum evaporation temperature and the preset single-pressure minimum evaporation temperature and the target temperature is lower than or equal to the actual temperature, the operation mode of the heat pump system is controlled to be the cascade cooling mode, including:

[0074] Control the medium temperature stage compressor to start, the medium temperature stage solenoid valves and the medium temperature stage electronic expansion valves to open, the four-way reversing valve is in cooling mode, the medium temperature stage switching solenoid valve is closed, the low temperature stage switching solenoid valve is opened, the low temperature stage compressor is started, the low temperature stage solenoid valves and the low temperature stage electronic expansion valves are opened, and the preset cascade minimum evaporation temperature is lower than the preset single pressure minimum evaporation temperature.

[0075] Among them, the preset cascade minimum evaporating temperature and the preset single-pressure minimum evaporating temperature are both used as known quantities. When the target temperature is between the preset cascade minimum evaporating temperature and the preset single-pressure minimum evaporating temperature and the target temperature is lower than the actual temperature, the working mode of the heat pump system selects the cascade refrigeration mode. In this mode, both the medium-temperature compressor and the low-temperature compressor work, and electric heating can be used for auxiliary temperature control according to the actual temperature.

[0076] Step 230: When the target temperature is between the preset cascade minimum evaporation temperature and the preset single-pressure minimum evaporation temperature and the target temperature is higher than the actual temperature, the working mode of the heat pump system is controlled to be the cascade heating mode.

[0077] The specific control of the cascade heating mode is described in detail in the subsequent step 250 .

[0078] Step 240, when the target temperature is between the preset single-pressure minimum evaporation temperature and the ambient temperature and the target temperature is lower than or equal to the actual temperature, controlling the working mode of the heat pump system to be a single-pressure cooling mode or a cascade cooling mode, including:

[0079] If the single-pressure cooling mode is selected, the medium-temperature compressor is controlled to start, the solenoid valves and electronic expansion valves of the medium-temperature stage are opened, the four-way reversing valve is in cooling mode, the medium-temperature switching solenoid valve is opened, the low-temperature switching solenoid valve is closed, the low-temperature compressor is closed, and the solenoid valves and electronic expansion valves of the low-temperature stage are closed. Among them, the preset single-pressure minimum evaporation temperature is lower than the ambient temperature. When the target temperature is between the preset single-pressure minimum evaporation temperature and the ambient temperature and the target temperature is lower than the actual temperature, in the single-pressure cooling mode, the medium-temperature compressor works and the low-temperature compressor does not work. According to the actual temperature, electric heating can be used for auxiliary temperature control.

[0080] If the cascade refrigeration mode is selected, the medium temperature stage compressor is controlled to start, the medium temperature stage solenoid valves and the medium temperature stage electronic expansion valves are opened, the four-way reversing valve is in refrigeration mode, the medium temperature stage switching solenoid valve is closed, the low temperature stage switching solenoid valve is opened, the low temperature stage compressor is started, and the low temperature stage solenoid valves and the low temperature stage electronic expansion valves are opened.

[0081] Specifically, when the target temperature is between the preset single-pressure minimum evaporating temperature and the ambient temperature and the target temperature is lower than the actual temperature, in the cascade refrigeration mode, both the medium-temperature compressor and the low-temperature compressor work, and electric heating can be used for auxiliary temperature control according to the actual temperature.

[0082] Step 250, when the target temperature is between the preset single-pressure minimum evaporation temperature and the ambient temperature and the target temperature is higher than the actual temperature, controlling the working mode of the heat pump system to be a single-pressure heating mode or a cascade heating mode, including:

[0083] If single-pressure heating mode is selected, the medium-temperature stage compressor is controlled to start, the solenoid valves and electronic expansion valves of the medium-temperature stage are opened, the four-way reversing valve is in heating mode, the medium-temperature stage switching solenoid valve is opened, the low-temperature stage switching solenoid valve is closed, the low-temperature stage compressor is turned off, and the solenoid valves and electronic expansion valves of the low-temperature stage are closed.

[0084] If the cascade heating mode is selected, the medium temperature stage compressor is controlled to start, the solenoid valves and electronic expansion valves of the medium temperature stage are opened, the four-way reversing valve is in heating mode, the medium temperature stage switching solenoid valve is closed, the low temperature stage switching solenoid valve is opened, the low temperature stage compressor is started, the solenoid valves and electronic expansion valves of the low temperature stage are opened, and the preset cascade minimum evaporation temperature is lower than the preset single pressure minimum evaporation temperature.

[0085] Step 260: When the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, the operating mode of the heat pump system is controlled to be a single-pressure heating mode, including:

[0086] Control the medium temperature stage compressor to start, the medium temperature stage solenoid valves and the medium temperature stage electronic expansion valves to open, the four-way reversing valve is in heating mode, the medium temperature stage switching solenoid valve is opened, the low temperature stage switching solenoid valve is closed, the low temperature stage compressor is closed, and the low temperature stage solenoid valves and the low temperature stage electronic expansion valves are closed.

[0087] Among them, the preset single-pressure maximum condensing temperature is higher than the ambient temperature. When the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, the medium-temperature compressor works and the low-temperature compressor does not work. Electric heating can be used for auxiliary temperature control according to the actual temperature.

[0088] Step 270: When the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is lower than the actual temperature, the working mode of the heat pump system is controlled to be the single-pressure cooling mode.

[0089] The specific control of the single-pressure cooling mode may refer to the description of the above step 240, which will not be repeated here.

[0090] Step 280: When the target temperature is higher than the preset single-pressure maximum condensing temperature, control each compressor to shut down.

[0091] Specifically, when the target temperature is higher than the preset single-pressure maximum condensing temperature, the medium-temperature compressor and the low-temperature compressor will not work, and electric heating can be used to assist temperature control according to the actual temperature. In addition, when the required cooling or heating load of the target area is small, the medium-temperature jet solenoid valve is closed.

[0092] In addition, the specific opening degree of each electronic expansion valve can be controlled according to the actual working state of the heat pump system, which is not limited here.

[0093] It should be noted that the size of each parameter in this embodiment can be determined according to actual control requirements and is not limited here.

[0094] The control method of the heat pump system provided in this embodiment controls the compressors of the medium temperature stage and the low temperature stage to start or shut down, the four-way reversing valve to the cooling or heating mode, and the solenoid valves and the electronic expansion valves to open or close when the target temperature is in different temperature ranges, so as to control the temperature of the environmental test chamber, thereby solving the problem of high energy consumption caused by the use of electric heating when the environmental test chamber simulates a high temperature environment, thereby reducing energy consumption and improving energy utilization.

[0095] Embodiment 3

[0096] Figure 5 : is a flow chart of a control method for a heat pump system provided in Embodiment 3 of the present invention. This embodiment is based on Embodiment 1. The method can be executed by a processor of the heat pump system. The processor can be implemented in the form of software and / or hardware. The method specifically includes the following steps:

[0097] Step 310: Acquire the actual temperature, target temperature and ambient temperature of the target area.

[0098] The target area may be a test area of ​​an environmental test chamber, and the heat pump system heats or cools the test area of ​​the environmental test chamber. The target temperature of the target area may be input in advance, and the target area and the external environment where the target area is located may be provided with temperature sensors. The processor of the heat pump system is electrically connected to each temperature sensor to obtain the actual temperature of the target area and the ambient temperature.

[0099] For example, Figure 6 Schematic diagram of the structure of a heat pump system provided by the third embodiment of the present invention. Figure 2 and Figure 6The compressor module also includes a high-temperature compressor 24, the heat exchanger module also includes an inner third heat exchanger 25, a medium-temperature-high-temperature evaporative condenser 23, the economizer module also includes a high-temperature economizer 26, and the valve assembly also includes a medium-temperature switching solenoid valve 11, a high-temperature switching solenoid valve 22, a high-temperature jet solenoid valve 27, a high-temperature jet electronic expansion valve 28, a high-temperature main circuit solenoid valve 29, and a high-temperature main circuit electronic expansion valve 30; the exhaust port of the high-temperature compressor 24, the inlet and outlet of the inner third heat exchanger 25, the high-temperature economizer 26, and the injection port of the high-temperature compressor 24 are connected in sequence, and the high-temperature economizer 26 is connected through the high-temperature jet The pipeline where the solenoid valve 27 and the high-temperature jet electronic expansion valve 28 are located is connected to itself, and the high-temperature economizer 26 is connected to the first inlet of the medium-temperature-high-temperature evaporative condenser 23 through the high-temperature main circuit solenoid valve 29 and the high-temperature main circuit electronic expansion valve 30 in turn, and the first outlet of the medium-temperature-high-temperature evaporative condenser 23 is connected to the air intake of the high-temperature compressor 24, and the second inlet of the medium-temperature-high-temperature evaporative condenser 23 is connected to the exhaust port of the medium-temperature compressor 1 through the fourth end and the first end of the four-way reversing valve 2 in turn, and the second outlet of the medium-temperature-high-temperature evaporative condenser 23 is connected to the one-way valve assembly 4 through the high-temperature switching solenoid valve 22. Among them, the processor (not shown in the figure) is electrically connected to each compressor, the four-way reversing valve 2, each electronic expansion valve and each solenoid valve. Specifically, the first inlet and the first outlet of the high temperature stage economizer 26, the high temperature stage jet solenoid valve 27, the high temperature stage jet electronic expansion valve 28, the second inlet and the second outlet of the high temperature stage economizer 26, and the jet port of the high temperature stage compressor 24 are sequentially connected, and the second outlet of the medium temperature stage-high temperature stage evaporative condenser 23 is sequentially connected to the first inlet of the medium temperature stage economizer 5 through the high temperature stage switching solenoid valve 22 and the one-way valve 4 (c). The first (second) inlet of the high temperature stage economizer 26 is connected to its first (second) outlet, and the first (second) inlet of the medium temperature stage-high temperature stage evaporative condenser 23 is connected to its first (second) outlet.

[0100] The working modes of the heat pump system in this embodiment include single-pressure cooling and single-pressure heating modes, and also include cascade heating mode. When the heat pump system works in the cascade cooling mode, the test area of ​​the environmental test chamber can obtain a higher chamber temperature. Specifically, in the medium-temperature stage cycle, the gaseous refrigerant is compressed by the medium-temperature stage compressor 1, enters the four-way reversing valve 2 from the exhaust port of the medium-temperature stage compressor 1, and then enters the medium-temperature stage-high temperature stage condensing evaporator 23 to condense and release heat. The condensed refrigerant enters the medium-temperature stage economizer 5 through the one-way valve 4 (c) to achieve supercooling. A part of the supercooled refrigerant is throttled by the medium-temperature stage jet electronic expansion valve 7 and enters the medium-temperature stage economizer 5 again to evaporate and absorb heat, and finally returns to the injection port of the medium-temperature stage compressor 1. Another part of the supercooled refrigerant is throttled by the medium-temperature stage main circuit electronic expansion valve 9, enters the outer heat exchanger 3 through the one-way valve 4 (d) to evaporate and absorb heat, and finally passes through the four-way reversing valve 2 Return to the suction port of the medium-temperature stage compressor 1; in the high-temperature stage cycle, the gaseous refrigerant is compressed by the high-temperature stage compressor 24, enters the inner third heat exchanger 25 from the exhaust port of the high-temperature stage compressor 24 to condense and release heat, and the condensed refrigerant enters the high-temperature stage economizer 26 to achieve supercooling. A part of the supercooled refrigerant is throttled by the high-temperature stage jet electronic expansion valve 28 and enters the high-temperature stage economizer 26 again to evaporate and absorb heat, and finally returns to the injection port of the high-temperature stage compressor 24. Another part of the supercooled refrigerant is throttled by the high-temperature stage main circuit electronic expansion valve 30, enters the medium-temperature stage-high-temperature stage condenser evaporator 23 to evaporate and absorb heat, and finally returns to the suction port of the high-temperature stage compressor 24.

[0101] The extremely high temperature environment that can be simulated by the environmental test chamber of this embodiment is determined by the refrigerant used in the high-temperature cycle. The refrigerant used in the high-temperature cycle includes at least one of R600, R11, R114, R124, R142b, R245fa, R1234ze(E), and R1336mzz(Z). By selecting a suitable refrigerant, a low temperature below -40°C or a high temperature above 150°C can be achieved in the test area of ​​the environmental test chamber.

[0102] Step 320: When the target temperature is between the preset single-pressure minimum evaporation temperature and the ambient temperature and the target temperature is lower than or equal to the actual temperature, the operation mode of the heat pump system is controlled to be a single-pressure cooling mode, including:

[0103] Control the medium temperature stage compressor to start, the medium temperature stage solenoid valves and the medium temperature stage electronic expansion valves to open, the four-way reversing valve is in cooling mode, the medium temperature stage switching solenoid valve is opened, the high temperature stage switching solenoid valve is closed, the high temperature stage compressor is closed, and the high temperature stage solenoid valves and the high temperature stage electronic expansion valves are closed.

[0104] Among them, when the preset single-pressure minimum evaporating temperature is lower than the ambient temperature, and the target temperature is between the preset single-pressure minimum evaporating temperature and the ambient temperature and the target temperature is lower than the actual temperature, the working mode of the heat pump system selects the single-pressure cooling mode. In this mode, the medium-temperature compressor works and the high-temperature compressor does not work. Electric heating can be used for auxiliary temperature control according to the actual temperature.

[0105] Step 330: When the target temperature is between the preset single-pressure minimum evaporation temperature and the ambient temperature and the target temperature is higher than the actual temperature, the working mode of the heat pump system is controlled to be a single-pressure heating mode.

[0106] The specific control of the single-press heating mode is described in detail in the subsequent step 340 .

[0107] Step 340: When the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, the operation mode of the heat pump system is controlled to be a single-pressure heating mode or a cascade heating mode, including:

[0108] If the single-pressure heating mode is selected, the medium-temperature compressor is controlled to start, the medium-temperature solenoid valves and the medium-temperature electronic expansion valves are opened, the four-way reversing valve is in heating mode, the medium-temperature switching solenoid valve is opened, the high-temperature switching solenoid valve is closed, the high-temperature compressor is closed, and the high-temperature solenoid valves and the high-temperature electronic expansion valves are closed. Among them, when the preset single-pressure maximum condensing temperature is higher than the ambient temperature, the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than the actual temperature, in the single-pressure heating mode, the medium-temperature compressor works and the high-temperature compressor does not work. According to the actual temperature, electric heating can be used for auxiliary temperature control.

[0109] If the cascade heating mode is selected, the medium temperature stage compressor is controlled to start, the solenoid valves and electronic expansion valves of the medium temperature stage are opened, the four-way reversing valve is in heating mode, the medium temperature stage switching solenoid valve is closed, the high temperature stage switching solenoid valve is opened, the high temperature stage compressor is started, and the solenoid valves and electronic expansion valves of the high temperature stage are opened.

[0110] Specifically, when the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than the actual temperature, in the cascade heating mode, both the medium-temperature compressor and the high-temperature compressor work, and electric heating can be used for auxiliary temperature control according to the actual temperature.

[0111] Step 350: When the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is lower than the actual temperature, the working mode of the heat pump system is controlled to be the single-pressure cooling mode or the cascade cooling mode.

[0112] The specific control of the single-pressure refrigeration mode can refer to the description of the above step 310, which will not be repeated here. The specific control of the cascade refrigeration mode is described in detail in the subsequent step 360.

[0113] Step 360: When the target temperature is between the preset single-pressure maximum condensing temperature and the preset cascade maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, the operation mode of the heat pump system is controlled to be the cascade heating mode, including:

[0114] Control the medium temperature stage compressor to start, the medium temperature stage solenoid valves and the medium temperature stage electronic expansion valves to open, the four-way reversing valve is in heating mode, the medium temperature stage switching solenoid valve is closed, the high temperature stage switching solenoid valve is opened, the high temperature stage compressor is started, the high temperature stage solenoid valves and the high temperature stage electronic expansion valves are opened, and the preset single pressure maximum condensing temperature is lower than the preset cascade maximum condensing temperature.

[0115] Among them, when the preset single-pressure maximum condensing temperature is lower than the preset cascade maximum condensing temperature, and the target temperature is between the preset single-pressure maximum condensing temperature and the preset cascade maximum condensing temperature and the target temperature is higher than the actual temperature, the working mode of the heat pump system selects the cascade heating mode. In this mode, both the medium-temperature compressor and the high-temperature compressor work, and electric heating can be used for auxiliary temperature control according to the actual temperature.

[0116] Step 370: When the target temperature is between the preset single-pressure maximum condensing temperature and the preset cascade maximum condensing temperature and the target temperature is lower than the actual temperature, the operation mode of the heat pump system is controlled to be the cascade cooling mode, including:

[0117] Control the medium temperature stage compressor to start, the medium temperature stage solenoid valves and the medium temperature stage electronic expansion valves to open, the four-way reversing valve is in cooling mode, the medium temperature stage switching solenoid valve is closed, the high temperature stage switching solenoid valve is opened, the high temperature stage compressor is started, and the high temperature stage solenoid valves and the high temperature stage electronic expansion valves are opened.

[0118] Step 380: When the target temperature is higher than the preset cascade maximum condensing temperature, control each compressor to shut down.

[0119] Specifically, when the target temperature is higher than the preset maximum condensing temperature of the cascade, the medium-temperature compressor and the high-temperature compressor do not work, and electric heating can be used to assist in temperature control according to the actual temperature. In addition, when the required cooling or heating load of the target area is small, the medium-temperature jet solenoid valve is closed.

[0120] In addition, the specific opening degree of each electronic expansion valve can be controlled according to the actual working state of the heat pump system, which is not limited here.

[0121] It should be noted that the size of each parameter in this embodiment can be determined according to actual control requirements and is not limited here.

[0122] The control method of the heat pump system provided in this embodiment controls the start or stop of the compressors of the medium temperature stage and the high temperature stage, the cooling or heating mode of the four-way reversing valve, and the opening or closing of each solenoid valve and each electronic expansion valve when the target temperature is in different temperature ranges, so as to control the temperature of the environmental test chamber, solve the problem of high energy consumption caused by the use of electric heating when the environmental test chamber simulates a high temperature environment, thereby reducing energy consumption and improving energy utilization.

[0123] Embodiment 4

[0124] Figure 7 : is a flow chart of a control method for a heat pump system provided in Embodiment 4 of the present invention. This embodiment is based on Embodiment 1. The method can be executed by a processor of the heat pump system. The processor can be implemented in the form of software and / or hardware. The method specifically includes the following steps:

[0125] Step 401: Acquire the actual temperature, target temperature and ambient temperature of the target area.

[0126] The target area may be a test area of ​​an environmental test chamber, and the heat pump system heats or cools the test area of ​​the environmental test chamber. The target temperature of the target area may be input in advance, and the target area and the external environment where the target area is located may be provided with temperature sensors. The processor of the heat pump system is electrically connected to each temperature sensor to obtain the actual temperature of the target area and the ambient temperature.

[0127] For example, Figure 8 Schematic diagram of the structure of a heat pump system provided by the fourth embodiment of the present invention. Figure 2 and Figure 8The compressor module also includes a low-temperature compressor 14 and a high-temperature compressor 24. The heat exchanger module also includes a medium-temperature-low-temperature evaporative condenser 13, a precooler 15, an inner second heat exchanger 21, a medium-temperature-high-temperature evaporative condenser 23, and an inner third heat exchanger 25. The economizer module also includes a low-temperature economizer 16 and a high-temperature economizer 26. The valve assembly also includes a medium-temperature switching solenoid valve 11, a low-temperature switching solenoid valve 12, a low-temperature jet solenoid valve 17, a low-temperature jet electronic expansion valve 18, a low-temperature main circuit solenoid valve 19, a low-temperature main circuit electronic expansion valve 20, a high-temperature switching solenoid valve 22, a high-temperature jet The air solenoid valve 27, the high-temperature jet electronic expansion valve 28, the high-temperature main circuit solenoid valve 29, the high-temperature main circuit electronic expansion valve 30; the exhaust port of the low-temperature compressor 14, the precooler 15, the first inlet and the first outlet of the medium-temperature-low-temperature evaporative condenser 13, the first inlet and the first outlet of the low-temperature economizer 16, the inner second heat exchanger 21, and the air intake port of the low-temperature compressor 14 are connected in sequence, the low-temperature economizer 16 is connected to itself through the pipeline where the low-temperature jet solenoid valve 17 and the low-temperature jet electronic expansion valve 18 are located, the low-temperature economizer 16 is connected to the injection port of the low-temperature compressor 14, and the low-temperature economizer 16 is connected to the injection port of the low-temperature compressor 14. The low-temperature main circuit solenoid valve 19 and the low-temperature main circuit electronic expansion valve 20 are connected with the inner second heat exchanger 21 in sequence. The second inlet of the medium-temperature-low-temperature evaporative condenser 13 is connected with the one-way valve assembly 4 through the low-temperature switching solenoid valve 12. The second outlet of the medium-temperature-low-temperature evaporative condenser 13 is connected with the suction port of the medium-temperature compressor 1 through the third end and the fourth end of the four-way reversing valve 2 in sequence; the exhaust port of the high-temperature compressor 24, the inlet and outlet of the inner third heat exchanger 25, the high-temperature economizer 26, and the injection port of the high-temperature compressor 24 are connected in sequence. The high-temperature economizer 26 is connected with the suction port of the medium-temperature compressor 1 through the high-temperature injection solenoid valve 27 and The pipeline where the high-temperature stage jet electronic expansion valve 28 is located is connected to itself, and the high-temperature stage economizer 26 is connected to the first inlet of the medium-temperature stage-high-temperature stage evaporative condenser 23 through the high-temperature stage main circuit solenoid valve 29 and the high-temperature stage main circuit electronic expansion valve 30 in sequence, and the first outlet of the medium-temperature stage-high-temperature stage evaporative condenser 23 is connected to the intake port of the high-temperature stage compressor 24, and the second inlet of the medium-temperature stage-high-temperature stage evaporative condenser 23 is connected to the exhaust port of the medium-temperature stage compressor 1 through the fourth end and the first end of the four-way reversing valve 2 in sequence, and the second outlet of the medium-temperature stage-high-temperature stage evaporative condenser 23 is connected to the one-way valve assembly 4 through the high-temperature stage switching solenoid valve 22.

[0128] The processor (not shown in the figure) is electrically connected to each compressor, the four-way reversing valve 2, each electronic expansion valve and each solenoid valve. Specifically, the second inlet of the medium-temperature-low-temperature evaporative condenser 13 is connected to the first inlet of the medium-temperature-level economizer 5 through the low-temperature-level switching solenoid valve 12 and the one-way valve 4 (c) in sequence. The first outlet of the low-temperature-level economizer 16 is connected to the second inlet of the low-temperature-level economizer 16 through the low-temperature-level jet solenoid valve 17 and the low-temperature-level jet electronic expansion valve 18 in sequence, and the second outlet of the low-temperature-level economizer 16 is connected to the injection port of the low-temperature-level compressor 14. The first (second) inlet of the low-temperature-level economizer 16 is connected to its own first (second) outlet, and the first (second) inlet of the medium-temperature-low-temperature-level evaporative condenser 13 is connected to its own first (second) outlet. The first inlet and the first outlet of the high temperature stage economizer 26, the high temperature stage jet solenoid valve 27, the high temperature stage jet electronic expansion valve 28, the second inlet and the second outlet of the high temperature stage economizer 26, and the jet port of the high temperature stage compressor 24 are sequentially connected, and the second outlet of the medium temperature stage-high temperature stage evaporative condenser 23 is sequentially connected to the first inlet of the medium temperature stage economizer 5 through the high temperature stage switching solenoid valve 22 and the one-way valve 4 (c). The first (second) inlet of the high temperature stage economizer 26 is connected to its first (second) outlet, and the first (second) inlet of the medium temperature stage-high temperature stage evaporative condenser 23 is connected to its first (second) outlet.

[0129] The working modes of the heat pump system in this embodiment include four modes: single-pressure refrigeration, single-pressure heating, cascade refrigeration, and cascade heating. By reasonably matching the refrigerants in each level of circulation, a low temperature below -80°C or a high temperature above 150°C can be achieved in the test area of ​​the high and low temperature test chamber.

[0130] Step 402: When the target temperature is between the preset cascade minimum evaporation temperature and the preset single-pressure minimum evaporation temperature and the target temperature is lower than or equal to the actual temperature, the operation mode of the heat pump system is controlled to be the cascade cooling mode, including:

[0131] Control the start of the medium-temperature stage compressor, the medium-temperature stage solenoid valves and the medium-temperature stage electronic expansion valves are opened, the four-way reversing valve is in cooling mode, the medium-temperature stage switching solenoid valve is closed, the low-temperature stage switching solenoid valve is opened, the high-temperature stage switching solenoid valve is closed, the low-temperature stage compressor is started, the high-temperature stage compressor is closed, the low-temperature stage solenoid valves and the low-temperature stage electronic expansion valves are opened, the high-temperature stage solenoid valves and the high-temperature stage electronic expansion valves are closed, and the preset cascade minimum evaporation temperature is lower than the preset single-pressure minimum evaporation temperature.

[0132] Among them, the preset cascade minimum evaporation temperature and the preset single-pressure minimum evaporation temperature are both known quantities. When the target temperature is between the preset cascade minimum evaporation temperature and the preset single-pressure minimum evaporation temperature and the target temperature is lower than or equal to the actual temperature, the working mode of the heat pump system selects the cascade refrigeration mode. In this mode, both the medium-temperature compressor and the low-temperature compressor work, and electric heating can be used for auxiliary temperature control according to the actual temperature.

[0133] Step 403: When the target temperature is between the preset cascade minimum evaporation temperature and the preset single-pressure minimum evaporation temperature and the target temperature is higher than the actual temperature, the working mode of the heat pump system is controlled to be the cascade heating mode or the single-pressure heating mode.

[0134] The specific control of the cascade heating mode or the single-pressure heating mode is described in detail in the subsequent step 406 .

[0135] Step 404: when the target temperature is between the preset single-pressure minimum evaporation temperature and the ambient temperature and the target temperature is lower than or equal to the actual temperature, the operation mode of the heat pump system is controlled to be a cascade cooling mode or a single-pressure cooling mode, including:

[0136] If the single-pressure cooling mode is selected, the medium-temperature compressor is controlled to start, the solenoid valves and electronic expansion valves of the medium-temperature stage are opened, the four-way reversing valve is in cooling mode, the medium-temperature switching solenoid valve is opened, the low-temperature switching solenoid valve is closed, the high-temperature switching solenoid valve is closed, the low-temperature compressor is closed, the high-temperature compressor is closed, the low-temperature solenoid valves and the electronic expansion valves of the low-temperature stage are closed, and the high-temperature solenoid valves and the electronic expansion valves of the high-temperature stage are closed. Among them, the preset single-pressure minimum evaporation temperature is lower than the ambient temperature. When the target temperature is between the preset single-pressure minimum evaporation temperature and the ambient temperature and the target temperature is lower than or equal to the actual temperature, in the single-pressure cooling mode, the medium-temperature compressor works and the low-temperature compressor does not work. Electric heating can be used for auxiliary temperature control according to the actual temperature.

[0137] If cascade refrigeration mode is selected, the medium temperature stage compressor is controlled to start, the medium temperature stage solenoid valves and the medium temperature stage electronic expansion valves are opened, the four-way reversing valve is in refrigeration mode, the medium temperature stage switching solenoid valve is closed, the low temperature stage switching solenoid valve is opened, the high temperature stage switching solenoid valve is closed, the low temperature stage compressor is started, the high temperature stage compressor is shut down, the low temperature stage solenoid valves and the low temperature stage electronic expansion valves are opened, and the high temperature stage solenoid valves and the high temperature stage electronic expansion valves are closed.

[0138] Specifically, when the target temperature is between the preset single-pressure minimum evaporating temperature and the ambient temperature and the target temperature is lower than or equal to the actual temperature, in the cascade refrigeration mode, both the medium-temperature compressor and the low-temperature compressor work, and electric heating can be used for auxiliary temperature control according to the actual temperature.

[0139] Step 405: When the target temperature is between the preset single-pressure minimum evaporation temperature and the ambient temperature and the target temperature is higher than the actual temperature, the working mode of the heat pump system is controlled to be the cascade heating mode or the single-pressure heating mode.

[0140] The specific control of the cascade heating mode or the single-pressure heating mode is described in detail in the subsequent step 406 .

[0141] Step 406: When the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, the operation mode of the heat pump system is controlled to be the cascade heating mode or the single-pressure heating mode, including:

[0142] If single-pressure heating mode is selected, the medium-temperature stage compressor is controlled to start, the medium-temperature stage solenoid valves and the medium-temperature stage electronic expansion valves are opened, the four-way reversing valve is in heating mode, the medium-temperature stage switching solenoid valve is opened, the low-temperature stage switching solenoid valve is closed, the high-temperature stage switching solenoid valve is closed, the low-temperature stage compressor is closed, the high-temperature stage compressor is closed, the low-temperature stage solenoid valves and the low-temperature stage electronic expansion valves are closed, and the high-temperature stage solenoid valves and the high-temperature stage electronic expansion valves are closed.

[0143] Among them, when the preset single-pressure maximum condensing temperature is higher than the ambient temperature, and the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, in the single-pressure heating mode, the medium-temperature compressor works and the high-temperature compressor does not work. Electric heating can be used for auxiliary temperature control according to the actual temperature.

[0144] Step 407: When the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, the operation mode of the heat pump system is controlled to be the cascade heating mode or the single-pressure heating mode, including:

[0145] If cascade heating mode is selected, the medium temperature stage compressor is controlled to start, the solenoid valves and electronic expansion valves of the medium temperature stage are opened, the four-way reversing valve is in heating mode, the medium temperature stage switching solenoid valve is closed, the low temperature stage switching solenoid valve is closed, the high temperature stage switching solenoid valve is opened, the high temperature stage compressor is started, the low temperature stage compressor is closed, the solenoid valves and electronic expansion valves of the high temperature stage are opened, and the solenoid valves and electronic expansion valves of the low temperature stage are closed.

[0146] Specifically, when the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, in the cascade heating mode, both the medium-temperature compressor and the high-temperature compressor work, and electric heating can be used for auxiliary temperature control according to the actual temperature.

[0147] Step 408: When the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is lower than the actual temperature, the working mode of the heat pump system is controlled to be the cascade cooling mode or the single-pressure cooling mode.

[0148] The specific control of the cascade refrigeration mode or the single-pressure refrigeration mode may refer to the description of the above step 404, which will not be repeated here.

[0149] Step 409: When the target temperature is between the preset single-pressure maximum condensing temperature and the preset cascade maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, the operation mode of the heat pump system is controlled to be the cascade heating mode, including:

[0150] Control the start of the medium temperature stage compressor, the medium temperature stage solenoid valves and the medium temperature stage electronic expansion valves are opened, the four-way reversing valve is in heating mode, the medium temperature stage switching solenoid valve is closed, the low temperature stage switching solenoid valve is closed, the high temperature stage switching solenoid valve is opened, the high temperature stage compressor is started, the low temperature stage compressor is closed, the high temperature stage solenoid valves and the high temperature stage electronic expansion valves are opened, the low temperature stage solenoid valves and the low temperature stage electronic expansion valves are closed, and the preset single pressure maximum condensing temperature is lower than the preset cascade maximum condensing temperature.

[0151] Among them, when the preset single-pressure maximum condensing temperature is lower than the preset cascade maximum condensing temperature, and the target temperature is between the preset single-pressure maximum condensing temperature and the preset cascade maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, the working mode of the heat pump system selects the cascade heating mode. In this mode, both the medium-temperature compressor and the high-temperature compressor work, and electric heating can be used for auxiliary temperature control according to the actual temperature.

[0152] Step 491: When the target temperature is between the single-pressure maximum condensing temperature and the cascade maximum condensing temperature and the target temperature is lower than the actual temperature, the working mode of the heat pump system is controlled to be the cascade cooling mode or the single-pressure cooling mode.

[0153] The specific control of the cascade refrigeration mode or the single-pressure refrigeration mode may refer to the description of the above step 404, which will not be repeated here.

[0154] Step 492: When the target temperature is higher than the preset cascade maximum condensing temperature, control each compressor to shut down.

[0155] Specifically, when the target temperature is higher than the preset maximum condensing temperature of the cascade, the medium-temperature compressor and the high-temperature compressor do not work, and electric heating can be used to assist in temperature control according to the actual temperature. In addition, when the required cooling or heating load of the target area is small, the medium-temperature jet solenoid valve is closed.

[0156] Further, Fig. 9 is a flow chart of another control method of a heat pump system provided in Embodiment 4 of the present invention, with reference to Figure 7 and Fig. 9 And steps 401-492, control the heat pump system according to the target temperature and each preset temperature and the actual temperature to achieve temperature regulation.

[0157] In addition, the specific opening degree of each electronic expansion valve can be controlled according to the actual working state of the heat pump system, which is not limited here.

[0158] It should be noted that the size of each parameter in this embodiment can be determined according to actual control requirements and is not limited here.

[0159] The control method of the heat pump system provided in this embodiment controls the compressors of the medium temperature stage, the low temperature stage, and the high temperature stage to start or shut down, the four-way reversing valve to the cooling or heating mode, and the solenoid valves and the electronic expansion valves to open or close when the target temperature is in different temperature ranges, so as to control the temperature of the environmental test chamber, solve the problem of high energy consumption caused by the use of electric heating when the environmental test chamber simulates a high temperature environment, thereby reducing energy consumption and improving energy utilization.

[0160] Embodiment 5

[0161] Fig.10 1 is a block diagram of a control device for a heat pump system provided in Embodiment 5 of the present invention. The structure of the heat pump system can refer to the structure of the heat pump system in Embodiment 1, and will not be described in detail here. Fig.10 The control device includes: a temperature acquisition module 510 and a state control module 520. The temperature acquisition module 510 is used to acquire the actual temperature, target temperature and ambient temperature of the target area; the state control module 520 is used to control the working state of each compressor, the working state of the reversing valve, the working state of each solenoid valve and the working state of each electronic expansion valve according to the actual temperature, the target temperature and the ambient temperature.

[0162] Based on the above implementation, the structure of the heat pump system is as follows: Figure 2 As shown, the state control module 520 is specifically used to control the medium-temperature compressor to start, each solenoid valve and each electronic expansion valve to open, and the four-way reversing valve to switch to the cooling mode, and the preset single-pressure minimum evaporating temperature is lower than the ambient temperature when the target temperature is between the preset single-pressure minimum evaporating temperature and the ambient temperature and the target temperature is lower than the actual temperature; when the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve to open, and the four-way reversing valve to switch to the heating mode, and the preset single-pressure maximum condensing temperature is higher than the ambient temperature; when the target temperature is higher than the preset single-pressure maximum condensing temperature, the medium-temperature compressor is controlled to shut down.

[0163] In one embodiment, the structure of the heat pump system is as follows Figure 4As shown, the state control module 520 is specifically used to control the medium-temperature compressor to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage to open, the four-way reversing valve to be in cooling mode, the medium-temperature stage switching solenoid valve to be closed, the low-temperature stage switching solenoid valve to be opened, the low-temperature stage compressor to start, each solenoid valve and each electronic expansion valve of the low-temperature stage to be opened, and the preset cascade minimum evaporation temperature to be lower than the preset single-pressure minimum evaporation temperature; when the target temperature is between the preset single-pressure minimum evaporation temperature and the ambient temperature and the target temperature is lower than or equal to the actual temperature, if the single-pressure cooling mode is selected, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the low-temperature stage to be opened. The middle-stage compressor starts, the solenoid valves and electronic expansion valves of the medium-temperature stage are opened, the four-way reversing valve is in cooling mode, the middle-temperature stage switching solenoid valve is opened, the low-temperature stage switching solenoid valve is closed, the low-temperature stage compressor is closed, and the solenoid valves and electronic expansion valves of the low-temperature stage are closed; when the target temperature is between the preset single-pressure minimum evaporating temperature and the ambient temperature and the target temperature is lower than or equal to the actual temperature, if the cascade cooling mode is selected, the middle-temperature stage compressor is controlled to start, the solenoid valves and electronic expansion valves of the medium-temperature stage are opened, the four-way reversing valve is in cooling mode, the middle-temperature stage switching solenoid valve is closed, the low-temperature stage switching solenoid valve is opened, the low-temperature stage compressor is started, and the solenoid valves and electronic expansion valves of the low-temperature stage are opened. When the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, the medium-temperature stage compressor is controlled to start, the medium-temperature stage solenoid valves and the medium-temperature stage electronic expansion valves are opened, the four-way reversing valve is in heating mode, the medium-temperature stage switching solenoid valve is opened, the low-temperature stage switching solenoid valve is closed, the low-temperature stage compressor is closed, and the low-temperature stage solenoid valves and the low-temperature stage electronic expansion valves are closed; when the target temperature is higher than the preset single-pressure maximum condensing temperature, each compressor is controlled to be closed.

[0164] Optionally, the structure of the heat pump system is as follows Figure 6As shown, the state control module 520 is specifically used to control the medium-temperature compressor to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage to open, the four-way reversing valve to be in cooling mode, the medium-temperature stage switching solenoid valve to open, the high-temperature stage switching solenoid valve to close, the high-temperature stage compressor to close, and each solenoid valve and each electronic expansion valve of the high-temperature stage to close when the target temperature is between the preset single-pressure minimum evaporation temperature and the ambient temperature and the target temperature is lower than or equal to the actual temperature; when the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, if the single-pressure heating mode is selected, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are controlled to start, and each solenoid valve and each electronic expansion valve of the medium-temperature stage are controlled to start. The electronic expansion valves of the medium temperature stage are opened, the four-way reversing valve is in heating mode, the medium temperature stage switching solenoid valve is opened, the high temperature stage switching solenoid valve is closed, the high temperature stage compressor is closed, and the high temperature stage solenoid valves and the electronic expansion valves of the high temperature stage are closed; when the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, if the cascade heating mode is selected, the medium temperature stage compressor is controlled to start, the medium temperature stage solenoid valves and the electronic expansion valves of the medium temperature stage are opened, the four-way reversing valve is in heating mode, the medium temperature stage switching solenoid valve is closed, the high temperature stage switching solenoid valve is opened, the high temperature stage compressor is started, and the high temperature stage solenoid valves and the electronic expansion valves of the high temperature stage are opened. When the target temperature is between the preset single-pressure maximum condensing temperature and the preset cascade maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, the medium-temperature stage compressor is controlled to start, the solenoid valves and electronic expansion valves of the medium-temperature stage are opened, the four-way reversing valve is in heating mode, the medium-temperature stage switching solenoid valve is closed, the high-temperature stage switching solenoid valve is opened, the high-temperature stage compressor is started, the solenoid valves and electronic expansion valves of the high-temperature stage are opened, and the preset single-pressure maximum condensing temperature is lower than the preset cascade maximum condensing temperature; when the target temperature is higher than the preset cascade maximum condensing temperature, the compressors are controlled to shut down.

[0165] Optionally, the structure of the heat pump system is as follows Figure 8As shown, the state control module 520 is specifically used to control the medium-temperature compressor to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage to open, the four-way reversing valve to be in cooling mode, the medium-temperature stage switching solenoid valve to be closed, the low-temperature stage switching solenoid valve to be opened, the high-temperature stage switching solenoid valve to be closed, the low-temperature stage compressor to be started, the high-temperature stage compressor to be closed, each solenoid valve and each electronic expansion valve of the low-temperature stage to be opened, each solenoid valve and each electronic expansion valve of the high-temperature stage to be closed, and the preset cascade minimum evaporation temperature to be lower than the preset single-pressure minimum evaporation temperature; when the target temperature is between the preset single-pressure minimum evaporation temperature and the ambient temperature and the target temperature is lower than or equal to the actual temperature, if the single-pressure cooling mode is selected, the medium-temperature compressor is controlled to start, the solenoid valves and electronic expansion valves of the medium-temperature stage are opened, the four-way reversing valve is in cooling mode, the medium-temperature switching solenoid valve is opened, the low-temperature switching solenoid valve is closed, the high-temperature switching solenoid valve is closed, the low-temperature compressor is closed, the high-temperature compressor is closed, the low-temperature solenoid valves and the electronic expansion valves of the low-temperature stage are closed, and the high-temperature solenoid valves and the electronic expansion valves of the high-temperature stage are closed; when the target temperature is between the preset single-pressure minimum evaporating temperature and the ambient temperature and the target temperature is lower than or equal to the actual temperature, if the cascade cooling mode is selected, the medium-temperature compressor is controlled to start, the solenoid valves and the electronic expansion valves of the medium-temperature stage are opened, the four-way reversing valve is in cooling mode, the medium-temperature switching solenoid valve is opened, the low-temperature switching solenoid valve is closed, the high-temperature switching solenoid valve is closed, the low-temperature compressor is closed, the high-temperature compressor is closed, the low-temperature solenoid valves and the electronic expansion valves of the low-temperature stage are closed, and the high-temperature solenoid valves and the electronic expansion valves of the high-temperature stage are closed. The sub-expansion valve is opened, the four-way reversing valve is in cooling mode, the medium-temperature stage switching solenoid valve is closed, the low-temperature stage switching solenoid valve is opened, the high-temperature stage switching solenoid valve is closed, the low-temperature stage compressor is started, the high-temperature stage compressor is closed, the low-temperature stage solenoid valves and the low-temperature stage electronic expansion valves are opened, and the high-temperature stage solenoid valves and the high-temperature stage electronic expansion valves are closed; when the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, if the single-pressure heating mode is selected, the medium-temperature stage compressor is controlled to start, the medium-temperature stage solenoid valves and the medium-temperature stage electronic expansion valves are opened, the four-way reversing valve is in heating mode, the medium-temperature stage switching solenoid valve is opened, the low-temperature stage switching solenoid valve is closed, the high-temperature stage switching solenoid valve is closed, and the low-temperature stage The compressor is turned off, the high-temperature compressor is turned off, the low-temperature solenoid valves and the low-temperature electronic expansion valves are turned off, and the high-temperature solenoid valves and the high-temperature electronic expansion valves are turned off; when the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, if the cascade heating mode is selected, the medium-temperature compressor is controlled to start, the medium-temperature solenoid valves and the medium-temperature electronic expansion valves are turned on, the four-way reversing valve is in heating mode, the medium-temperature switching solenoid valve is turned off, the low-temperature switching solenoid valve is turned off, the high-temperature switching solenoid valve is turned on, the high-temperature compressor is started, the low-temperature compressor is turned off, the high-temperature solenoid valves and the high-temperature electronic expansion valves are turned on, and the low-temperature solenoid valves and the low-temperature electronic expansion valves are turned off;When the target temperature is between the preset single-pressure maximum condensing temperature and the preset cascade maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are opened, the four-way reversing valve is in heating mode, the medium-temperature switching solenoid valve is closed, the low-temperature switching solenoid valve is closed, the high-temperature switching solenoid valve is opened, the high-temperature compressor is started, the low-temperature compressor is closed, each solenoid valve and each electronic expansion valve of the high-temperature stage are opened, each solenoid valve and each electronic expansion valve of the low-temperature stage are closed, and the preset single-pressure maximum condensing temperature is lower than the preset cascade maximum condensing temperature; when the target temperature is higher than the preset cascade maximum condensing temperature, each compressor is controlled to be closed. ;

[0166] This embodiment also provides a heat pump system, including: a processor, a compressor module, a heat exchanger module, an economizer module and a valve assembly, the valve assembly includes a reversing valve, at least one solenoid valve and at least one electronic expansion valve, the compressor module includes at least one compressor, the compressor module is connected to the heat exchanger module through the reversing valve, the heat exchanger module is also connected to the compressor module through the economizer module, the solenoid valve, and the electronic expansion valve, the processor is electrically connected to the compressor module and the valve assembly, and the control method described in any embodiment of the present invention is executed by the processor. The specific control process of the processor on the heat pump system can refer to the description of any of the above embodiments, which will not be repeated here.

[0167] refer to Figure 2 Optionally, the compressor module includes a medium-temperature compressor 1, the heat exchanger module includes an outer heat exchanger 3 and an inner first heat exchanger 10, the economizer module includes a medium-temperature economizer 5, the reversing valve is a four-way reversing valve 2, and the valve assembly includes a medium-temperature jet solenoid valve 6, a medium-temperature jet electronic expansion valve 7, a medium-temperature main circuit solenoid valve 8, a medium-temperature main circuit electronic expansion valve 9, and a one-way valve assembly 4; refer to Figure 4 , the compressor module also includes a low-temperature compressor 14, the heat exchanger module also includes an inner second heat exchanger 21, the economizer module also includes a low-temperature economizer 16, the valve assembly also includes a medium-temperature switching solenoid valve 11, a low-temperature switching solenoid valve 12, a medium-temperature-low-temperature evaporative condenser 13, a low-temperature jet solenoid valve 17, a low-temperature jet electronic expansion valve 18, a low-temperature main circuit solenoid valve 19, a low-temperature main circuit electronic expansion valve 20, and the heat pump system also includes a precooler 15; or, refer to Figure 6 , the compressor module also includes a high-temperature compressor 24, the heat exchanger module also includes an inner third heat exchanger 25, the economizer module also includes a high-temperature economizer 26, and the valve assembly also includes a medium-temperature switching solenoid valve 11, a high-temperature switching solenoid valve 22, a medium-temperature-high-temperature evaporative condenser 23, a high-temperature jet solenoid valve 27, a high-temperature jet electronic expansion valve 28, a high-temperature main circuit solenoid valve 29, and a high-temperature main circuit electronic expansion valve 30; or, refer to Figure 8 The compressor module also includes a low-temperature compressor 14 and a high-temperature compressor 24, the heat exchanger module also includes an inner second heat exchanger 21 and an inner third heat exchanger 25, the economizer module also includes a low-temperature economizer 16 and a high-temperature economizer 26, the valve assembly also includes a medium-temperature switching solenoid valve 11, a low-temperature switching solenoid valve 12, a medium-temperature-low-temperature evaporative condenser 13, a low-temperature jet solenoid valve 17, a low-temperature jet electronic expansion valve 18, a low-temperature main circuit solenoid valve 19, a low-temperature main circuit electronic expansion valve 20, a high-temperature switching solenoid valve 22, a medium-temperature-high-temperature evaporative condenser 23, a high-temperature jet solenoid valve 27, a high-temperature jet electronic expansion valve 28, a high-temperature main circuit solenoid valve 29, and a high-temperature main circuit electronic expansion valve 30, and the heat pump system also includes a precooler 15. The specific connection relationship of the components in the heat pump system can refer to the structural description of the heat pump system in any of the above embodiments, which will not be repeated here.

[0168] This embodiment also provides an environmental test chamber, including: a heat pump system as described in any embodiment of the present invention. The heat pump technology is combined with the jet enthalpy increase technology and applied to the environmental test chamber, and a reasonable control method is used to optimize the system and control, thereby reducing energy consumption while taking into account the performance of the environmental test chamber. The optimization effect of the system is that, on the one hand, from a thermodynamic point of view, the heating efficiency of the heat pump technology is higher than that of traditional electric heating, and the use of a heating cycle to increase the temperature fully utilizes the heat energy of the air source, effectively improving the energy utilization efficiency. On the other hand, for compressors with the same gas output, the use of jet enthalpy increase technology increases the system's cooling and heating capacities, and improves energy efficiency. The optimization effect on control is that, on the one hand, when there is a need for cooling or heating, the cooling or heating cycle is mainly used, supplemented by electric heating, which reduces energy consumption while taking into account the temperature control performance of the high and low temperature test chamber. On the other hand, the method of opening or closing the jet solenoid valve is determined according to the size of the cooling or heating load required in the test area of ​​the test chamber. When the cooling or heating load in the test area of ​​the test chamber is small, the jet solenoid valve is closed to reduce the energy consumption of the compressor. When the cooling or heating load in the test area of ​​the test chamber is large, the jet solenoid valve is opened to take into account the temperature rise and fall performance of the high and low temperature environment test chamber, thereby achieving rational use of energy.

[0169] The control device, heat pump system and environmental test chamber of the heat pump system provided in this embodiment belong to the same inventive concept as the control method of the heat pump system provided in any embodiment of the present invention, and have corresponding beneficial effects. For technical details not detailed in this embodiment, please refer to the control method of the heat pump system provided in any embodiment of the present invention.

[0170] Embodiment 6

[0171] Fig.11It is a structural schematic diagram of an electronic device provided in Embodiment 6 of the present invention. Fig.11 A block diagram of an exemplary electronic device 412 suitable for use in implementing embodiments of the present invention is shown. Fig.11 The electronic device 412 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0172] like Fig.11 As shown, the electronic device 412 is in the form of a general purpose device. The components of the electronic device 412 may include, but are not limited to: one or more processors 416, a storage device 428, and a bus 418 connecting different system components (including the storage device 428 and the processor 416).

[0173] Bus 418 represents one or more of several types of bus structures, including a storage device bus or storage device processor, a peripheral bus, an accelerated graphics port, a processor or a local bus using any of a variety of bus architectures. For example, these architectures include but are not limited to Industry Subversive Alliance (ISA) bus, Micro Channel Architecture (MAC) bus, Enhanced ISA bus, Video Electronics Standards Association (VESA) local bus and Peripheral Component Interconnect (PCI) bus.

[0174] The electronic device 412 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by the electronic device 412, including volatile and non-volatile media, removable and non-removable media.

[0175] The storage device 428 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 430 and / or cache memory 432. The electronic device 412 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, the storage system 434 may be used to read and write non-removable, non-volatile magnetic media ( Fig.11 not shown, usually called a "hard drive"). Although Fig.11Not shown in the figure, a disk drive for reading and writing a removable non-volatile disk (e.g., a "floppy disk"), and an optical disk drive for reading and writing a removable non-volatile optical disk, such as a read-only optical disk (Compact Disc Read-Only Memory, CD-ROM), a digital video disk (Digital Video Disc-Read Only Memory, DVD-ROM) or other optical media) may be provided. In these cases, each drive may be connected to the bus 418 via one or more data medium interfaces. The storage device 428 may include at least one program product having a set (e.g., at least one) of program modules that are configured to perform the functions of the various embodiments of the present invention.

[0176] A program / utility 440 having a set (at least one) of program modules 442 may be stored, for example, in storage device 428, such program modules 442 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment. Program modules 442 generally perform the functions and / or methods of the embodiments described herein.

[0177] The electronic device 412 may also communicate with one or more external devices 414 (e.g., a keyboard, a pointing terminal, a display 424, etc.), may also communicate with one or more terminals that enable a user to interact with the electronic device 412, and / or communicate with any terminal that enables the electronic device 412 to communicate with one or more other computing terminals (e.g., a network card, a modem, etc.). Such communication may be performed through an input / output (I / O) interface 422. Furthermore, the electronic device 412 may also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) through a network adapter 420. Fig.11 As shown, the network adapter 420 communicates with other modules of the electronic device 412 via the bus 418. It should be understood that, although not shown in the figure, other hardware and / or software modules can be used in conjunction with the electronic device 412, including but not limited to: microcode, terminal drivers, redundant processors, external disk drive arrays, disk arrays (Redundant Arrays of Independent Disks, RAID) systems, tape drives, and data backup storage systems.

[0178] The processor 416 executes various functional applications and data processing by running the program stored in the storage device 428, for example, implementing the control method of the heat pump system provided in the embodiment of the present invention, the control method comprising:

[0179] Obtain the actual temperature and target temperature of the target area as well as the ambient temperature;

[0180] According to the actual temperature, the target temperature and the ambient temperature, the working state of each compressor, the working state of the reversing valve, the working state of each solenoid valve and the working state of each electronic expansion valve are controlled.

[0181] Embodiment 7

[0182] Embodiment 7 of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, a control method for a heat pump system provided in an embodiment of the present invention is implemented. The control method includes:

[0183] Obtain the actual temperature and target temperature of the target area as well as the ambient temperature;

[0184] According to the actual temperature, the target temperature and the ambient temperature, the working state of each compressor, the working state of the reversing valve, the working state of each solenoid valve and the working state of each electronic expansion valve are controlled.

[0185] The computer storage medium of the embodiment of the present invention can adopt any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples (non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, a computer-readable storage medium can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it.

[0186] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, which carry computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0187] Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0188] Computer program code for performing the operations of the present invention may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or terminal. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0189] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, re-modulations, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A control method for a heat pump system, characterized in that: The heat pump system comprises a processor, a compressor module, a heat exchanger module, an economizer module and a valve assembly, wherein the valve assembly comprises a reversing valve, at least one solenoid valve and at least one electronic expansion valve, the compressor module comprises at least one compressor, the compressor module is communicated with the heat exchanger module through the reversing valve, the heat exchanger module is also communicated with the compressor module through the economizer module, the solenoid valve and the electronic expansion valve, the processor is electrically connected to the compressor module and the valve assembly, and the control method is executed by the processor; The control method comprises: Obtain the actual temperature and target temperature of the target area as well as the ambient temperature; According to the actual temperature, the target temperature and the ambient temperature, the working state of each compressor, the working state of the reversing valve, the working state of each solenoid valve and the working state of each electronic expansion valve are controlled.

2. The control method of the heat pump system according to claim 1, characterized in that: The compressor module includes a medium-temperature compressor, the heat exchanger module includes an outer heat exchanger and an inner first heat exchanger, the economizer module includes a medium-temperature economizer, the reversing valve is a four-way reversing valve, and the valve assembly includes a medium-temperature jet solenoid valve, a medium-temperature main circuit solenoid valve, a medium-temperature jet electronic expansion valve, a medium-temperature main circuit electronic expansion valve, and a one-way valve assembly; the exhaust port of the medium-temperature compressor is connected to the outer heat exchanger through the first end and the second end of the four-way reversing valve in sequence, and the outer heat exchanger is connected to the outer heat exchanger through the one-way valve assembly The medium-temperature economizer is connected to the medium-temperature economizer, which is connected to the first inner heat exchanger through the medium-temperature main circuit solenoid valve, the medium-temperature main circuit electronic expansion valve, and the one-way valve assembly in sequence. The medium-temperature economizer is connected to the injection port of the medium-temperature compressor. The medium-temperature economizer is connected to itself through the pipeline where the medium-temperature jet solenoid valve and the medium-temperature jet electronic expansion valve are located. The first inner heat exchanger is connected to the suction port of the medium-temperature compressor through the third end and the fourth end of the four-way reversing valve in sequence. The controlling the working state of each compressor, the working state of the reversing valve, the working state of each solenoid valve and the working state of each electronic expansion valve according to the actual temperature, the target temperature and the ambient temperature includes: When the target temperature is between the preset single-pressure minimum evaporation temperature and the ambient temperature and the target temperature is lower than or equal to the actual temperature, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve is opened, and the four-way reversing valve is switched to the cooling mode, and the preset single-pressure minimum evaporation temperature is lower than the ambient temperature; When the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve is opened, and the four-way reversing valve is switched to a heating mode, and the preset single-pressure maximum condensing temperature is higher than the ambient temperature; When the target temperature is higher than the preset single-pressure maximum condensing temperature, the medium-temperature stage compressor is controlled to be turned off.

3. The control method of the heat pump system according to claim 2, characterized in that: The compressor module also includes a low-temperature compressor, the heat exchanger module also includes an inner second heat exchanger, a medium-temperature-low-temperature evaporative condenser, and a precooler, the economizer module also includes a low-temperature economizer, and the valve assembly also includes a medium-temperature switching solenoid valve, a low-temperature switching solenoid valve, a low-temperature jet solenoid valve, a low-temperature jet electronic expansion valve, a low-temperature main circuit solenoid valve, and a low-temperature main circuit electronic expansion valve; the exhaust port of the low-temperature compressor, the precooler, the medium-temperature-low-temperature evaporative condenser, the low-temperature economizer, the inner second heat exchanger, and the air intake port of the low-temperature compressor are sequentially The low-temperature economizer is connected to the low-temperature stage through the low-temperature stage jet electronic expansion valve and the pipeline where the low-temperature stage jet solenoid valve is located. The low-temperature stage economizer is connected to the injection port of the low-temperature stage compressor. The low-temperature stage economizer is connected to the inner second heat exchanger through the low-temperature main circuit solenoid valve and the low-temperature main circuit electronic expansion valve in sequence. The medium-temperature stage-low-temperature stage evaporative condenser is connected to the one-way valve assembly through the low-temperature stage switching solenoid valve. The medium-temperature stage-low-temperature stage evaporative condenser is connected to the suction port of the medium-temperature stage compressor through the third end and the fourth end of the four-way reversing valve in sequence. The controlling the working state of each compressor, the working state of the reversing valve, the working state of each solenoid valve and the working state of each electronic expansion valve according to the actual temperature, the target temperature and the ambient temperature includes: When the target temperature is between the preset cascade minimum evaporation temperature and the preset single-pressure minimum evaporation temperature and the target temperature is lower than or equal to the actual temperature, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are opened, the four-way reversing valve is in cooling mode, the medium-temperature switching solenoid valve is closed, the low-temperature switching solenoid valve is opened, the low-temperature compressor is started, each solenoid valve and each electronic expansion valve of the low-temperature stage are opened, and the preset cascade minimum evaporation temperature is lower than the preset single-pressure minimum evaporation temperature; When the target temperature is between the preset single-pressure minimum evaporation temperature and the ambient temperature and the target temperature is lower than or equal to the actual temperature, if the single-pressure refrigeration mode is selected, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are opened, the four-way reversing valve is in refrigeration mode, the medium-temperature switching solenoid valve is opened, the low-temperature switching solenoid valve is closed, the low-temperature compressor is closed, and each solenoid valve and each electronic expansion valve of the low-temperature stage are closed; When the target temperature is between the preset single-pressure minimum evaporating temperature and the ambient temperature and the target temperature is lower than or equal to the actual temperature, if the cascade refrigeration mode is selected, the medium-temperature stage compressor is controlled to start, the medium-temperature stage solenoid valves and the medium-temperature stage electronic expansion valves are opened, the four-way reversing valve is in refrigeration mode, the medium-temperature stage switching solenoid valve is closed, the low-temperature stage switching solenoid valve is opened, the low-temperature stage compressor is started, and the low-temperature stage solenoid valves and the low-temperature stage electronic expansion valves are opened.

4. The control method of the heat pump system according to claim 3, characterized in that: Also includes: When the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are opened, the four-way reversing valve is in heating mode, the medium-temperature switching solenoid valve is opened, the low-temperature switching solenoid valve is closed, the low-temperature compressor is closed, and each solenoid valve and each electronic expansion valve of the low-temperature stage are closed; When the target temperature is higher than the preset single-pressure maximum condensing temperature, each compressor is controlled to be turned off.

5. The control method of the heat pump system according to claim 2, characterized in that: The compressor module also includes a high-temperature compressor, the heat exchanger module also includes an inner third heat exchanger, a medium-temperature-high-temperature evaporative condenser, the economizer module also includes a high-temperature economizer, and the valve assembly also includes a medium-temperature switching solenoid valve, a high-temperature switching solenoid valve, a high-temperature jet solenoid valve, a high-temperature jet electronic expansion valve, a high-temperature main circuit solenoid valve, and a high-temperature main circuit electronic expansion valve; the exhaust port of the high-temperature compressor, the inner third heat exchanger, the high-temperature economizer, and the injection port of the high-temperature compressor are connected in sequence, and the high-temperature economizer is connected through the high-temperature The pipelines where the jet solenoid valve and the high-temperature jet electronic expansion valve are located are connected to themselves, the high-temperature economizer is connected to the medium-temperature-high-temperature evaporative condenser through the high-temperature main circuit solenoid valve and the high-temperature main circuit electronic expansion valve in sequence, the medium-temperature-high-temperature evaporative condenser is connected to the one-way valve assembly through the high-temperature switching solenoid valve, the medium-temperature-high-temperature evaporative condenser is connected to the exhaust port of the medium-temperature compressor through the fourth end and the first end of the four-way reversing valve in sequence, and the medium-temperature-high-temperature evaporative condenser is connected to the suction port of the high-temperature compressor; The controlling the working state of each compressor, the working state of the reversing valve, the working state of each solenoid valve and the working state of each electronic expansion valve according to the actual temperature, the target temperature and the ambient temperature includes: When the target temperature is between the preset single-pressure minimum evaporation temperature and the ambient temperature and the target temperature is lower than or equal to the actual temperature, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are opened, the four-way reversing valve is in cooling mode, the medium-temperature switching solenoid valve is opened, the high-temperature switching solenoid valve is closed, the high-temperature compressor is closed, and each solenoid valve and each electronic expansion valve of the high-temperature stage are closed; When the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, if the single-pressure heating mode is selected, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are opened, the four-way reversing valve is in heating mode, the medium-temperature switching solenoid valve is opened, the high-temperature switching solenoid valve is closed, the high-temperature compressor is closed, and each solenoid valve and each electronic expansion valve of the high-temperature stage are closed; When the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, if the cascade heating mode is selected, the medium-temperature stage compressor is controlled to start, the medium-temperature stage solenoid valves and the medium-temperature stage electronic expansion valves are opened, the four-way reversing valve is in heating mode, the medium-temperature stage switching solenoid valve is closed, the high-temperature stage switching solenoid valve is opened, the high-temperature stage compressor is started, and the high-temperature stage solenoid valves and the high-temperature stage electronic expansion valves are opened.

6. The control method of the heat pump system according to claim 5, characterized in that: Also includes: When the target temperature is between the preset single-pressure maximum condensing temperature and the preset cascade maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are opened, the four-way reversing valve is in heating mode, the medium-temperature switching solenoid valve is closed, the high-temperature switching solenoid valve is opened, the high-temperature compressor is started, each solenoid valve and each electronic expansion valve of the high-temperature stage are opened, and the preset single-pressure maximum condensing temperature is lower than the preset cascade maximum condensing temperature; When the target temperature is higher than the preset cascade maximum condensing temperature, each compressor is controlled to be turned off.

7. The control method of the heat pump system according to claim 2, characterized in that: The compressor module also includes a low-temperature compressor and a high-temperature compressor, the heat exchanger module also includes an inner second heat exchanger, an inner third heat exchanger, a medium-temperature-low-temperature evaporative condenser, a medium-temperature-high-temperature evaporative condenser, and a precooler, the economizer module also includes a low-temperature economizer and a high-temperature economizer, and the valve assembly also includes a medium-temperature switching solenoid valve, a low-temperature switching solenoid valve, a low-temperature jet solenoid valve, a low-temperature jet electronic expansion valve, a low-temperature main circuit solenoid valve, a low-temperature main circuit electronic expansion valve, a high-temperature switching solenoid valve, and a high-temperature jet solenoid valve. , high-temperature jet electronic expansion valve, high-temperature main circuit solenoid valve, high-temperature main circuit electronic expansion valve; the exhaust port of the low-temperature compressor, the precooler, the medium-temperature-low-temperature evaporative condenser, the low-temperature economizer, the inner second heat exchanger, and the air intake port of the low-temperature compressor are connected in sequence, the low-temperature economizer is connected to itself through the pipeline where the low-temperature jet electronic expansion valve and the low-temperature jet solenoid valve are located, the low-temperature economizer is connected to the injection port of the low-temperature compressor, and the low-temperature economizer is connected in sequence through the low-temperature main circuit The low-temperature main circuit solenoid valve and the low-temperature main circuit electronic expansion valve are connected to the inner second heat exchanger, the medium-temperature-low-temperature evaporative condenser is connected to the one-way valve assembly through the low-temperature switching solenoid valve, and the medium-temperature-low-temperature evaporative condenser is connected to the suction port of the medium-temperature compressor through the third end and the fourth end of the four-way reversing valve in sequence; the exhaust port of the high-temperature compressor, the inner third heat exchanger, the high-temperature economizer, and the injection port of the high-temperature compressor are connected in sequence, and the high-temperature economizer is connected to the high-temperature injection solenoid valve and the high-temperature The pipeline where the medium-temperature-stage jet electronic expansion valve is located is connected to itself, the high-temperature-stage economizer is connected to the medium-temperature-stage-high-temperature-stage evaporative condenser through the high-temperature-stage main circuit solenoid valve and the high-temperature-stage main circuit electronic expansion valve in sequence, the medium-temperature-stage-high-temperature-stage evaporative condenser is connected to the one-way valve assembly through the high-temperature-stage switching solenoid valve, the medium-temperature-high-temperature-stage evaporative condenser is connected to the exhaust port of the medium-temperature-stage compressor through the fourth end and the first end of the four-way reversing valve in sequence, and the medium-temperature-high-temperature-stage evaporative condenser is connected to the air intake port of the high-temperature-stage compressor; The controlling the working state of each compressor, the working state of the reversing valve, the working state of each solenoid valve and the working state of each electronic expansion valve according to the actual temperature, the target temperature and the ambient temperature includes: When the target temperature is between the preset cascade minimum evaporation temperature and the preset single-pressure minimum evaporation temperature and the target temperature is lower than or equal to the actual temperature, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are opened, the four-way reversing valve is in cooling mode, the medium-temperature switching solenoid valve is closed, the low-temperature switching solenoid valve is opened, the high-temperature switching solenoid valve is closed, the low-temperature compressor is started, the high-temperature compressor is closed, each solenoid valve and each electronic expansion valve of the low-temperature stage are opened, each solenoid valve and each electronic expansion valve of the high-temperature stage are closed, and the preset cascade minimum evaporation temperature is lower than the preset single-pressure minimum evaporation temperature; When the target temperature is between the preset single-pressure minimum evaporation temperature and the ambient temperature and the target temperature is lower than or equal to the actual temperature, if the single-pressure refrigeration mode is selected, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are opened, the four-way reversing valve is in refrigeration mode, the medium-temperature switching solenoid valve is opened, the low-temperature switching solenoid valve is closed, the high-temperature switching solenoid valve is closed, the low-temperature compressor is closed, the high-temperature compressor is closed, each solenoid valve of the low-temperature stage and each electronic expansion valve of the low-temperature stage are closed, and each solenoid valve of the high-temperature stage and each electronic expansion valve of the high-temperature stage are closed; When the target temperature is between the preset single-pressure minimum evaporation temperature and the ambient temperature and the target temperature is lower than or equal to the actual temperature, if the cascade refrigeration mode is selected, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are opened, the four-way reversing valve is in refrigeration mode, the medium-temperature switching solenoid valve is closed, the low-temperature switching solenoid valve is opened, the high-temperature switching solenoid valve is closed, the low-temperature compressor is started, the high-temperature compressor is closed, each solenoid valve and each electronic expansion valve of the low-temperature stage are opened, and each solenoid valve and each electronic expansion valve of the high-temperature stage are closed; When the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, if the single-pressure heating mode is selected, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are opened, the four-way reversing valve is in heating mode, the medium-temperature switching solenoid valve is opened, the low-temperature switching solenoid valve is closed, the high-temperature switching solenoid valve is closed, the low-temperature compressor is closed, the high-temperature compressor is closed, each solenoid valve of the low-temperature stage and each electronic expansion valve of the low-temperature stage are closed, and each solenoid valve of the high-temperature stage and each electronic expansion valve of the high-temperature stage are closed; When the target temperature is between the ambient temperature and the preset single-pressure maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, if the cascade heating mode is selected, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are opened, the four-way reversing valve is in heating mode, the medium-temperature switching solenoid valve is closed, the low-temperature switching solenoid valve is closed, the high-temperature switching solenoid valve is opened, the high-temperature compressor is started, the low-temperature compressor is closed, each solenoid valve and each electronic expansion valve of the high-temperature stage are opened, and each solenoid valve and each electronic expansion valve of the low-temperature stage are closed; When the target temperature is between the preset single-pressure maximum condensing temperature and the preset cascade maximum condensing temperature and the target temperature is higher than or equal to the actual temperature, the medium-temperature compressor is controlled to start, each solenoid valve and each electronic expansion valve of the medium-temperature stage are opened, the four-way reversing valve is in heating mode, the medium-temperature switching solenoid valve is closed, the low-temperature switching solenoid valve is closed, the high-temperature switching solenoid valve is opened, the high-temperature compressor is started, the low-temperature compressor is closed, each solenoid valve and each electronic expansion valve of the high-temperature stage are opened, each solenoid valve and each electronic expansion valve of the low-temperature stage are closed, and the preset single-pressure maximum condensing temperature is lower than the preset cascade maximum condensing temperature; When the target temperature is higher than the preset cascade maximum condensing temperature, each compressor is controlled to be turned off.

8. A heat pump system, characterized in that: include: A processor, a compressor module, a heat exchanger module, an economizer module and a valve assembly, wherein the valve assembly includes a reversing valve, at least one solenoid valve and at least one electronic expansion valve, the compressor module includes at least one compressor, the compressor module is connected to the heat exchanger module through the reversing valve, the heat exchanger module is also connected to the compressor module through the economizer module, the solenoid valve and the electronic expansion valve, the processor is electrically connected to the compressor module and the valve assembly, and the control method as described in any one of claims 1 to 7 is executed by the processor.

9. The heat pump system according to claim 8, characterized in that: The compressor module includes a medium-temperature compressor, the heat exchanger module includes an outer heat exchanger and an inner first heat exchanger, the economizer module includes a medium-temperature economizer, the reversing valve is a four-way reversing valve, and the valve assembly includes a medium-temperature jet solenoid valve, a medium-temperature main circuit solenoid valve, a medium-temperature jet electronic expansion valve, a medium-temperature main circuit electronic expansion valve, and a one-way valve assembly; The compressor module also includes a low-temperature compressor, the heat exchanger module also includes an inner second heat exchanger, a medium-temperature-low-temperature evaporative condenser, and a precooler, the economizer module also includes a low-temperature economizer, and the valve assembly also includes a medium-temperature switching solenoid valve, a low-temperature switching solenoid valve, a low-temperature jet solenoid valve, a low-temperature jet electronic expansion valve, a low-temperature main circuit solenoid valve, and a low-temperature main circuit electronic expansion valve; or, the compressor module also includes a high-temperature compressor, the heat exchanger module also includes an inner third heat exchanger, a medium-temperature-high-temperature evaporative condenser, the economizer module also includes a high-temperature economizer, the valve assembly also includes a medium-temperature switching solenoid valve, a high-temperature switching solenoid valve, a high-temperature jet solenoid valve, a high-temperature jet electronic expansion valve, a high-temperature main circuit solenoid valve, and a high-temperature main circuit electronic expansion valve; or, the compressor module also includes a low-temperature compressor and a high-temperature compressor.

10. An environmental test chamber, characterized in that: include: A heat pump system as described in any one of claims 8 to 9.

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