Refrigeration system, refrigeration system control method and air conditioner

Abstract

The present invention provides a refrigeration system, a refrigeration system control method and an air conditioner, which belong to the field of refrigeration technology. The refrigeration system includes a compressor, a four-way valve, a condenser, a throttling device and an evaporator connected by a refrigerant pipeline; the four-way valve has a high-pressure air inlet, a high-pressure air inlet pipeline is arranged between the high-pressure air inlet and the compressor exhaust port, and an energy storage pipeline is also arranged on the high-pressure air inlet pipeline, and the energy storage pipeline and the high-pressure air inlet pipeline can be connected and disconnected; wherein the energy storage pipeline can store part of the high-pressure gas in the high-pressure air inlet pipe when the refrigeration system is running, and can release the stored high-pressure gas to the high-pressure air inlet pipe when the refrigeration system is in low-temperature heating start-up, so that the four-way valve has a sufficient pressure difference when switching, thereby ensuring the normal switching of the four-way valve.

Description

Technical Field

[0001] The present invention relates to the field of heat exchange technology, and in particular to a refrigeration system, a refrigeration system control method and an air conditioner. Background Art

[0002] In the refrigeration system, the four-way valve is a device that realizes the conversion between the cooling mode and the heating mode, thereby realizing the heating function of the heat pump air conditioner and meeting the needs of users. Therefore, it is particularly important to ensure the normal switching of the four-way valve, a key component, for the entire refrigeration system.

[0003] The existing four-way valves are basically controlled by a pilot valve with an electromagnetic coil. The capillary pressure difference on the left and right sides of the valve body drives the valve core to move left and right to reverse the air-conditioning system. Therefore, the switching reliability of the four-way valve is mainly related to the suction and exhaust pressure difference in the system. When the system pressure difference is insufficient, the four-way valve will not switch or will be stuck in the middle position of the valve body, resulting in air leakage.

[0004] In existing refrigeration systems, in certain low-temperature environments, the system startup pressure difference is often lower than the minimum reversing pressure difference given by the four-way valve manufacturer (generally 0.2Mpa to 0.4Mpa). If there is a refrigerant leak, the system pressure difference will be further reduced. At this time, the reversing of the four-way valve is no longer reliable, which may lead to the occurrence of gas cross-talk, causing the heat of the refrigeration system to be significantly reduced in heating mode, and generating obvious abnormal noise; or even reversing failure, seriously affecting the user experience. Summary of the invention

[0005] In order to overcome the problems existing in the related art, the present invention provides a refrigeration system, a refrigeration system control method and an air conditioner.

[0006] A first aspect of an embodiment of the present invention provides a refrigeration system, comprising a compressor, a four-way valve, a condenser, a throttling device and an evaporator connected by a refrigerant pipeline;

[0007] The four-way valve has a high-pressure air inlet, a high-pressure air inlet pipeline is provided between the high-pressure air inlet and the compressor exhaust port, and an energy storage pipeline is also provided on the high-pressure air inlet pipeline, and the energy storage pipeline and the high-pressure air inlet pipeline can be connected in an on-off manner;

[0008] The energy storage pipeline can store part of the high-pressure gas in the high-pressure intake pipe when the refrigeration system is running, and can release the stored high-pressure gas into the high-pressure intake pipe when the refrigeration system is in low-temperature heating start-up to enable the four-way valve to switch normally.

[0009] In the above technical solution, a solenoid valve and an accumulator are arranged in series on the energy storage pipeline;

[0010] When the refrigeration system is running, the solenoid valve can be controlled to open to direct part of the high-pressure gas in the high-pressure intake pipe into the accumulator for storage;

[0011] The solenoid valve can be controlled to open when the refrigeration system is started at low temperature to release the high-pressure gas stored in the accumulator into the high-pressure intake pipe so that the four-way valve can be switched normally.

[0012] In the above technical solution, the refrigeration system also includes:

[0013] Temperature sensor module, used to monitor the temperature data of the compressor exhaust pipe, evaporator inner pipe, condenser outer pipe and outdoor environment;

[0014] The data comparison module is used to calculate the temperature difference ΔT1 between the compressor exhaust pipe and the evaporator inner pipe in the heating mode and compare it with the preset temperature difference ΔT0; and to calculate the temperature difference ΔT2 between the compressor exhaust pipe and the condenser outer pipe in the cooling mode and compare it with the preset temperature difference ΔT0; and to compare the outdoor ambient temperature T when the refrigeration system is started in low temperature heating mode. 外环 With the preset low temperature T 低温 ;

[0015] The control module is used to control the on-off of the solenoid valve according to the magnitude relationship between ΔT1 and ΔT0 in the heating mode or to control the on-off of the solenoid valve according to the magnitude relationship between ΔT2 and ΔT0 in the heating mode; and; the refrigeration system controls the on-off of the solenoid valve according to T when the low temperature heating is started. 外环 With T 低温 The size relationship between them controls the on and off of the solenoid valve.

[0016] In the above technical solution, the accumulator is a bladder accumulator or a spring accumulator.

[0017] A second aspect of an embodiment of the present invention provides a refrigeration system control method, which is applied to the refrigeration system mentioned above. The control method includes:

[0018] In the heating or cooling mode, the refrigeration system controls the energy storage pipeline to be connected with the high-pressure air intake pipeline and maintains the connected state for a preset time t1, during which the energy storage pipeline stores the high-pressure gas in the high-pressure air intake pipe;

[0019] When the refrigeration system is in low-temperature heating start-up, the energy storage pipeline is controlled to be in a connected state with the high-pressure intake pipeline, and the high-pressure gas in the energy storage pipeline is released into the high-pressure intake pipe so that the four-way valve can be switched normally.

[0020] In the above technical solution, when the refrigeration system is in the heating mode, the compressor exhaust pipe temperature T 排气 The temperature of the evaporator tube T 内管 The temperature difference ΔT1;

[0021] When ΔT1≥preset temperature difference ΔT0, the energy storage pipeline is controlled to be in a connected state with the high-pressure intake pipeline and the connected state is maintained for a preset time t1, at which time the energy storage pipeline stores the high-pressure gas in the high-pressure intake pipe;

[0022] When ΔT1<preset temperature difference ΔT0, wait for time t2 and determine again whether ΔT reaches the preset temperature difference ΔT0. If it does not reach the preset temperature difference ΔT0, continue to wait for time t2 and compare ΔT1 with ΔT0 again until ΔT1 reaches ΔT0.

[0023] In the above technical solution, when the refrigeration system is in the refrigeration mode, the compressor exhaust pipe temperature T is determined. 排气 and the condenser outer tube temperature T 外管 The temperature difference ΔT2;

[0024] When ΔT2≥preset temperature difference ΔT0, the energy storage pipeline is controlled to be in a connected state with the high-pressure intake pipeline and the connected state is maintained for a preset time t1, at which time the energy storage pipeline stores the high-pressure gas in the high-pressure intake pipe;

[0025] When ΔT2<preset temperature difference ΔT0, after waiting time t2, determine again whether ΔT reaches the preset temperature difference ΔT0. If it does not reach the preset temperature difference ΔT0, continue to wait for time t2 and compare ΔT2 with ΔT0 again until ΔT2 reaches ΔT0.

[0026] In the above technical solution, when judging the compressor exhaust pipe temperature T 排气 The temperature of the evaporator tube T 内管 Before the temperature difference ΔT1 is reached, the refrigeration system is controlled to operate in the heating mode for a preset time t0.

[0027] In the above technical solution, the compressor exhaust pipe temperature T is determined 排气 and the condenser outer tube temperature T 外管 Before the temperature difference ΔT2 is reached, the refrigeration system has been running in the cooling mode for a preset time period t0.

[0028] In the above technical solution, the control method further includes:

[0029] When the cooling system is started for heating, obtain the outdoor ambient temperature T 外环 And with the preset low temperature T 低温 Compare;

[0030] When T 外环 >Preset low temperature T 低温 When , the heating starts normally and the four-way valve switches normally;

[0031] When T 外环 ≤Preset low temperature T 低温When the energy storage pipeline is controlled to be in a connected state with the high-pressure intake pipeline, the high-pressure gas stored in the energy storage pipeline is released into the high-pressure intake pipe to ensure the normal reversing of the four-way valve.

[0032] A third aspect of an embodiment of the present invention provides an air conditioner, which includes the above-mentioned refrigeration system and / or the above-mentioned refrigeration system control method.

[0033] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0034] 1. In the embodiment of the present invention, an energy storage pipeline is provided in the refrigeration system, so that high-pressure gas in the refrigeration system pipeline can be stored as a backup during the operation of the refrigeration system. When the refrigeration system is started for low-temperature heating, the backup high-pressure gas stored in the energy storage pipeline can be released back into the refrigeration system pipeline so that the four-way valve has sufficient pressure difference when switching, thereby ensuring the normal switching of the four-way valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0036] Figure 1 A system schematic diagram of a refrigeration system embodiment of the present invention;

[0037] Figure 2 The first structural schematic diagram of the accumulator in the refrigeration system embodiment of the present invention shows the state of the accumulator before pressure accumulation;

[0038] Figure 3 A second structural schematic diagram of the accumulator in the refrigeration system embodiment of the present invention, showing the state of the accumulator after pressure accumulation;

[0039] Figure 4 A control logic diagram of a refrigeration system in a refrigeration operation in an embodiment of a refrigeration system control method of the present invention;

[0040] Figure 5 A control logic diagram of a refrigeration system in heating operation in an embodiment of a refrigeration system control method of the present invention;

[0041] Figure 6 A control logic diagram of a refrigeration system when starting in an embodiment of a refrigeration system control method of the present invention;

[0042] Among them: 1-shell, 2-bladder, 3-valve body. DETAILED DESCRIPTION

[0043] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0044] When the existing refrigeration system is started at low temperature, the four-way valve is prone to incomplete reversal or even reversal failure. In the embodiment of the present invention, by setting an energy storage pipeline in the refrigeration system, high-pressure gas in the refrigeration system pipeline can be stored as a backup during the operation of the refrigeration system. When the refrigeration system is started at low temperature for heating, the backup high-pressure gas stored in the energy storage pipeline can be released back to the pipeline of the refrigeration system so that the four-way valve has sufficient pressure difference when reversing, thereby ensuring the normal reversal of the four-way valve.

[0045] The following is combined with Figure 1-6 The technical solution of this embodiment is elaborated in detail. In the absence of conflict, the following implementation methods and embodiments can be combined with each other.

[0046] Example 1

[0047] like Figure 1-Figure 3 As shown, on the one hand, an embodiment of the present invention provides a refrigeration system, including a compressor, a four-way valve, a condenser, a throttling device and an evaporator connected by a refrigerant pipeline;

[0048] The four-way valve has a high-pressure air inlet, a high-pressure air inlet pipeline is provided between the high-pressure air inlet and the compressor exhaust port, and an energy storage pipeline is also provided on the high-pressure air inlet pipeline, and the energy storage pipeline and the high-pressure air inlet pipeline can be connected in an on-off manner;

[0049] The energy storage pipeline can store part of the high-pressure gas in the high-pressure intake pipe when the refrigeration system is running, and can release the stored high-pressure gas into the high-pressure intake pipe when the refrigeration system is in low-temperature heating start-up to enable the four-way valve to switch normally.

[0050] In the embodiment of the present invention, an energy storage pipeline is provided so that high-pressure gas in the refrigeration system pipeline can be stored as a backup during the operation of the refrigeration system. When the refrigeration system is started for low-temperature heating, the backup high-pressure gas stored in the energy storage pipeline can be released back into the pipeline of the refrigeration system so that the four-way valve has sufficient pressure difference when switching, thereby ensuring the normal switching of the four-way valve.

[0051] Specifically, Figure 1 As shown, a solenoid valve and an accumulator are arranged in series on the energy storage pipeline;

[0052] When the refrigeration system is running, the solenoid valve can be controlled to open to direct part of the high-pressure gas in the high-pressure intake pipe into the accumulator for storage;

[0053] The solenoid valve can be controlled to open when the refrigeration system is started at low temperature to release the high-pressure gas stored in the accumulator into the high-pressure intake pipe so that the four-way valve can be switched normally.

[0054] More specifically, the solenoid valve is a two-way valve, which is controlled by a solenoid coil installed on the valve body. The solenoid coil is connected to the control module. When the coil is not energized, the valve does not work and the two-way valve is in a closed state; when the coil is energized, the valve works and the two-way valve is in an open state. The accumulator is used to store the higher pressure of the refrigeration system when it is running at a high frequency and high flow rate. When the four-way valve needs to be switched, the pressure is released to establish a sufficient high and low pressure difference to ensure that the four-way valve can switch normally and quickly, so that the refrigeration system can start normally and quickly.

[0055] In a specific embodiment, the accumulator is a bladder accumulator, such as Figure 2 and Figure 3 As shown, the bladder accumulator includes a housing 1, a bladder body 2 and a valve body 3. Of course, in some alternative embodiments, the bladder accumulator can also be a spring accumulator or other accumulators with the same or similar functions. The specific form of the accumulator is not limited in this embodiment.

[0056] In any of the above embodiments, the refrigeration system further comprises:

[0057] Temperature sensor module: The temperature sensor module is used to monitor the temperature data of the compressor exhaust pipe, the evaporator inner pipe, the condenser outer pipe and the outdoor environment;

[0058] The data comparison module is used to calculate the temperature difference ΔT1 between the compressor exhaust pipe and the evaporator inner pipe in the heating mode and compare it with the preset temperature difference ΔT0, and to calculate the temperature difference ΔT2 between the compressor exhaust pipe and the condenser outer pipe in the cooling mode and compare it with the preset temperature difference ΔT0, and to compare the outdoor ambient temperature Touter ring with the preset low temperature temperature Tlow temperature when the refrigeration system is started in low temperature heating;

[0059] A control module, the control module is used to control the on-off of the solenoid valve according to the size relationship between ΔT1 and ΔT0 in the heating mode, or to control the on-off of the solenoid valve according to the size relationship between ΔT2 and ΔT0 in the heating mode; and; when the refrigeration system is started in low-temperature heating, it controls the on-off of the solenoid valve according to the size relationship between Touter loop and Tlow temperature.

[0060] On the other hand, an embodiment of the present invention further provides a refrigeration system control method, which is applied to the refrigeration system mentioned above, wherein the control method includes:

[0061] In the heating or cooling mode, the refrigeration system controls the energy storage pipeline to be connected with the high-pressure air intake pipeline and maintains the connected state for a preset time t1, during which the energy storage pipeline stores the high-pressure gas in the high-pressure air intake pipe;

[0062] When the refrigeration system is in low-temperature heating start-up, the energy storage pipeline is controlled to be in a connected state with the high-pressure intake pipeline, and the high-pressure gas in the energy storage pipeline is released into the high-pressure intake pipe so that the four-way valve can be switched normally.

[0063] In any of the above embodiments, when the refrigeration system is in the heating mode, the temperature difference ΔT1 between the compressor exhaust pipe temperature Texhaust and the evaporator inner pipe temperature Tintube is determined;

[0064] When ΔT1≥preset temperature difference ΔT0, the energy storage pipeline is controlled to be in a connected state with the high-pressure intake pipeline and the connected state is maintained for a preset time t1, at which time the energy storage pipeline stores the high-pressure gas in the high-pressure intake pipe;

[0065] When ΔT1<preset temperature difference ΔT0, after waiting time t2, it is determined again whether ΔT reaches the preset temperature difference ΔT0. If it does not reach the preset temperature difference ΔT0, the waiting time t2 is continued until ΔT1 reaches ΔT0.

[0066] In any of the above embodiments, when the refrigeration system is in the refrigeration mode, the temperature difference ΔT2 between the compressor exhaust pipe temperature Texhaust and the condenser outer pipe temperature Texternal is determined;

[0067] When ΔT2≥preset temperature difference ΔT0, the energy storage pipeline is controlled to be in a connected state with the high-pressure intake pipeline and the connected state is maintained for a preset time t1, at which time the energy storage pipeline stores the high-pressure gas in the high-pressure intake pipe;

[0068] When ΔT2<preset temperature difference ΔT0, after waiting time t2, it is determined again whether ΔT reaches the preset temperature difference ΔT0. If it does not reach the preset temperature difference ΔT0, the waiting time t2 is continued until ΔT2 reaches ΔT0.

[0069] It is worth noting that the preset temperature difference ΔT0, preset time lengths t1, t2 in the heating mode mentioned above may be the same as or different from the preset temperature difference ΔT0, preset time lengths t1, t2 in the cooling mode and may be adjusted according to actual conditions.

[0070] In any of the above embodiments, before determining the temperature difference ΔT1 between the compressor exhaust pipe temperature Texhaust and the evaporator inner pipe temperature Tintube, the refrigeration system is controlled to operate in the heating mode for a preset time t0.

[0071] In any of the above embodiments, the control method further includes:

[0072] When the refrigeration system is started for heating, the outdoor ambient temperature Touterloop is obtained and compared with the preset low temperature Tlow;

[0073] When Touter ring> preset low temperature Tlow temperature, heating starts normally and the four-way valve switches normally;

[0074] When Touter ring ≤ the preset low temperature Tlow temperature, the energy storage pipeline and the high-pressure intake pipeline are controlled to be in a connected state, and the high-pressure gas stored in the energy storage pipeline is released into the high-pressure intake pipe to ensure normal switching of the four-way valve.

[0075] In summary, it can be seen that the energy storage component in the embodiment of the present invention can store the higher pressure generated when the refrigeration system operates at high frequency and high flow, and release the pressure when the four-way valve needs to be switched, so as to establish a sufficient high and low pressure difference, ensure that the four-way valve can be switched normally and quickly, and enable the refrigeration system to start normally and quickly.

[0076] Combine the following Figure 4-Figure 5 The specific control process of the refrigeration system is described in detail:

[0077] like Figure 4 As shown, when the refrigeration system is running, the refrigeration system starts normally and runs for time t0. At this time, the exhaust pipe temperature T 排气 The temperature of the evaporator tube T 内管 Temperature difference ΔT1:

[0078] When ΔT1≥preset temperature difference ΔT0, it means that the high pressure is relatively high at this time. At this time, the solenoid valve coil is energized, so that the solenoid valve is opened, and the bladder accumulator is connected with the high-pressure air intake pipe in the refrigeration system. The volume of the bladder is compressed and reduced, and the pressure increases until the accumulator stores enough pressure P0. This process lasts for t1. After exceeding t1 time, the solenoid valve coil is de-energized, the solenoid valve is closed, and the accumulator is disconnected from the refrigeration system, completing energy storage;

[0079] When ΔT1 < preset temperature difference ΔT0, it means that the system is not stable at this time, and the exhaust temperature and exhaust pressure are low. At this time, after waiting for time t2, it is judged again whether ΔT1 meets the preset temperature difference ΔT0. If not, wait for time t2 again, and repeat the cycle until ΔT1 reaches ΔT0.

[0080] like Figure 5 As shown, when the refrigeration system is running for heating, the refrigeration system starts normally and runs for time t0. At this time, the exhaust pipe temperature T 排气 and the condenser outer tube temperature T 外管 Temperature difference ΔT2:

[0081] When ΔT2≥preset temperature difference ΔT0, it means that the high pressure is relatively high at this time. At this time, the solenoid valve coil is energized, so that the solenoid valve is opened, the bladder accumulator is connected to the system, the volume of the bladder is compressed and reduced, and the pressure increases until the accumulator stores enough pressure P0. This process lasts for t1. After t1 time, the solenoid valve coil is de-energized, so that the solenoid valve is closed, and the accumulator is disconnected from the system, completing energy storage;

[0082] When ΔT2 < preset temperature difference ΔT0, it means that the system is not stable at this time, and the exhaust temperature and exhaust pressure are low. At this time, after waiting for time t2, it is judged again whether ΔT2 meets the preset temperature difference ΔT0. If not, wait for time t2 again, and repeat the cycle until ΔT2 reaches ΔT0.

[0083] like Figure 5 As shown, when the refrigeration system starts heating, it first needs to detect the outdoor ambient temperature T 外 ring:

[0084] When T 外环 >Preset low temperature T 低温 At this time, the ambient temperature is not bad, the high and low pressure difference is enough to make the four-way valve switch normally, and the heating can be started normally;

[0085] When T 外环 ≤Preset low temperature T 低温 At this time, it is low temperature heating start. When the four-way valve coil is energized to prepare for reversing, the solenoid valve is energized synchronously to open the solenoid valve, and the bladder accumulator is connected to the system. Because the outdoor temperature is low at this time, the refrigerant working fluid pressure P is much smaller than the pressure P0 in the accumulator, the volume of the bladder increases rapidly, releasing the stored pressure, causing the pressure on the high-pressure side of the refrigeration system to increase rapidly, establishing a sufficient pressure difference, so that the four-way valve can be reversed smoothly and quickly.

[0086] It should be noted that when the outdoor ambient temperature is below 0°C, it is used as the low temperature when the low-temperature heating is started.

[0087] It is worth mentioning that the refrigeration system unit is usually tested for operation before leaving the factory. The test condition is generally at room temperature above 20°C. The unit can establish sufficient pressure difference and store sufficient energy or pressure in the accumulator. Therefore, even if the customer uses it for the first time and starts heating in severe low temperatures, the pressure can be released and the direction can be reversed normally.

[0088] On the other hand, an embodiment of the present invention further provides an air conditioner, which includes the above-mentioned refrigeration system and / or the above-mentioned refrigeration system control method.

[0089] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the embodiments disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary technical means in the art that are not disclosed in the present invention. The description and examples are to be regarded as exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0090] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0091] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the embodiments disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary technical means in the art that are not disclosed in the present invention. The description and examples are to be regarded as exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0092] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A refrigeration system, characterized in that: It includes a compressor, a four-way valve, a condenser, a throttling device and an evaporator connected by a refrigerant pipeline; The four-way valve has a high-pressure air inlet, a high-pressure air inlet pipeline is provided between the high-pressure air inlet and the compressor exhaust port, and an energy storage pipeline is also provided on the high-pressure air inlet pipeline, and the energy storage pipeline can be connected to the high-pressure air inlet pipeline in an on-off manner; The energy storage pipeline can store part of the high-pressure gas in the high-pressure intake pipe when the refrigeration system is running, and can release the stored high-pressure gas into the high-pressure intake pipe when the refrigeration system is in low-temperature heating start-up to enable the four-way valve to switch normally.

2. The refrigeration system according to claim 1, characterized in that: The energy storage pipeline is provided with a solenoid valve and an accumulator in series; The solenoid valve can be controlled to open during the operation of the refrigeration system to guide part of the high-pressure gas in the high-pressure intake pipe into the accumulator for storage; The solenoid valve can be controlled to open when the refrigeration system is started at low temperature to release the high-pressure gas stored in the accumulator into the high-pressure intake pipe so that the four-way valve can be switched normally.

3. The refrigeration system according to claim 2, characterized in that: The refrigeration system further comprises: A temperature sensing module is used to monitor the temperature data of the compressor exhaust pipe, the evaporator inner pipe, the condenser outer pipe and the outdoor environment; The data comparison module is used to calculate the temperature difference ΔT1 between the compressor exhaust pipe and the evaporator inner pipe in the heating mode and compare it with the preset temperature difference ΔT0; and to calculate the temperature difference ΔT2 between the compressor exhaust pipe and the condenser outer pipe in the cooling mode and compare it with the preset temperature difference ΔT0; and to compare the outdoor ambient temperature T when the refrigeration system is started in low temperature heating mode. 外环 With the preset low temperature T 低温 ; A control module is used to control the on-off of the solenoid valve according to the magnitude relationship between ΔT1 and ΔT0 in the heating mode or to control the on-off of the solenoid valve according to the magnitude relationship between ΔT2 and ΔT0 in the heating mode; and; when the refrigeration system is started at low temperature heating, the refrigeration system controls the on-off of the solenoid valve according to the magnitude relationship between ΔT1 and ΔT0. 外环 With T 低温 The size relationship between them controls the on and off of the solenoid valve.

4. The refrigeration system according to claim 2 or 3, characterized in that: The accumulator is a bladder accumulator or a spring accumulator.

5. A refrigeration system control method, applied to the refrigeration system according to any one of claims 1 to 4, characterized in that: The control method comprises: In the heating or cooling mode, the refrigeration system controls the energy storage pipeline to be connected with the high-pressure air intake pipeline and maintains the connected state for a preset time t1, during which the energy storage pipeline stores the high-pressure gas in the high-pressure air intake pipe; When the refrigeration system is in low-temperature heating start-up, the energy storage pipeline is controlled to be in a connected state with the high-pressure intake pipeline, and the high-pressure gas in the energy storage pipeline is released into the high-pressure intake pipe so that the four-way valve can be switched normally.

6. The control method according to claim 5, characterized in that: When the refrigeration system is in heating mode, determine the compressor exhaust pipe temperature T 排气 The temperature of the evaporator tube T 内管 The temperature difference ΔT1; When ΔT1≥preset temperature difference ΔT0, the energy storage pipeline is controlled to be in a connected state with the high-pressure intake pipeline and the connected state is maintained for a preset time t1, at which time the energy storage pipeline stores the high-pressure gas in the high-pressure intake pipe; When ΔT1<preset temperature difference ΔT0, wait for time t2 and determine again whether ΔT reaches the preset temperature difference ΔT0. If it does not reach the preset temperature difference ΔT0, continue to wait for time t2 and compare ΔT1 with ΔT0 again until ΔT1 reaches ΔT0.

7. The control method according to claim 5, characterized in that: When the refrigeration system is in refrigeration mode, determine the compressor exhaust pipe temperature T 排气 and the condenser outer tube temperature T 外管 The temperature difference ΔT2; When ΔT2≥preset temperature difference ΔT0, the energy storage pipeline is controlled to be in a connected state with the high-pressure intake pipeline and the connected state is maintained for a preset time t1, at which time the energy storage pipeline stores the high-pressure gas in the high-pressure intake pipe; When ΔT2<preset temperature difference ΔT0, after waiting time t2, determine again whether ΔT reaches the preset temperature difference ΔT0. If it does not reach the preset temperature difference ΔT0, continue to wait for time t2 and compare ΔT2 with ΔT0 again until ΔT2 reaches ΔT0.

8. The control method according to claim 6, characterized in that: In judging the compressor exhaust pipe temperature T 排气 The temperature of the evaporator tube T 内管 Before the temperature difference ΔT1 is reached, the refrigeration system is controlled to operate in the heating mode for a preset time period t0.

9. The control method according to claim 7, characterized in that: Determine the compressor exhaust pipe temperature T 排气 and the condenser outer tube temperature T 外管 Before the temperature difference ΔT2 is reached, the refrigeration system has been running in the refrigeration mode for a preset time period t0.

10. The control method according to claim 5, characterized in that: The control method further comprises: When the refrigeration system is started for heating, the outdoor ambient temperature T 外环 And with the preset low temperature T 低温 Compare; When T 外环 >Preset low temperature T 低温 When , the heating starts normally and the four-way valve switches normally; When T 外环 ≤Preset low temperature T 低温 When the energy storage pipeline is controlled to be in a connected state with the high-pressure intake pipeline, the high-pressure gas stored in the energy storage pipeline is released into the high-pressure intake pipe to ensure the normal reversing of the four-way valve.

11. An air conditioner, characterized in that: A refrigeration system comprising any one of claims 1 to 4 and / or a refrigeration system control method adopting any one of claims 5 to 10.

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