Enhanced vapor injection air conditioning system and control method

Abstract

The invention relates to the technical field of air conditioners, and provides an enhanced vapor injection air conditioning system and a control method.The enhanced vapor injection air conditioning system comprises a circulation pipeline, an enhanced vapor injection pipeline, a temperature sensor and a controller; the circulating pipeline comprises an enhanced vapor injection compressor, an evaporator, a flash evaporator and a condenser which are circularly connected; the enthalpy increasing pipeline is connected between the enhanced vapor injection compressor and the flash evaporator, and an enthalpy increasing control valve is arranged in the enthalpy increasing pipeline; the temperature sensor is used for detecting the outer environment temperature; the controller is connected with the enhanced vapor injection compressor, the enhanced vapor injection control valve and the temperature sensor and used for controlling opening and closing of the enhanced vapor injection control valve according to the operation mode and the detected outer environment temperature under the condition that the air conditioning system is started to operate. The system can eliminate the influence of an enthalpy increasing pipeline on refrigeration and normal-temperature heating working conditions, improves the low-temperature heating effect so as to meet different operation working conditions, and has the characteristics of simple structure, stability, reliability and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioning system with jet enthalpy increase and a control method thereof. Background Art

[0002] In the related technology, capillary tubes are generally used to control the enthalpy-added refrigerant flow rate of the air-conditioning system. Due to different requirements for the enthalpy-added refrigerant flow rate and the superheat before and after the enthalpy increase under different working conditions, the fixed-diameter normally open capillary tube cannot meet the needs of all working conditions and will have a negative impact on certain working conditions. For example, it will cause the capillary tubes to freeze more easily during refrigeration conditions, thereby affecting the normal operation of the air-conditioning system. Summary of the invention

[0003] The present invention provides a jet enthalpy-increasing air-conditioning system and a control method, which are used to solve the defect in the related technology that the enthalpy-increasing refrigerant flow rate controlled by the normally open capillary tube is the same, resulting in the inability to meet different working conditions. The system can eliminate the influence of the enthalpy-increasing pipeline on the refrigeration and normal temperature heating conditions, and improve the low-temperature heating effect, thereby meeting different operating conditions. The system has the characteristics of simple structure, stability and reliability.

[0004] The present invention provides an air-conditioning system with jet enthalpy increase, comprising:

[0005] A circulation pipeline, including a cyclically connected jet reheat compressor, an evaporator, a flash evaporator and a condenser;

[0006] An enthalpy increase pipeline is connected between the jet enthalpy increase compressor and the flash evaporator, and an enthalpy increase control valve is provided in the enthalpy increase pipeline;

[0007] Temperature sensor, used to detect the external ring temperature;

[0008] The controller is respectively connected to the jet enthalpy increase compressor, the enthalpy increase control valve and the temperature sensor, and is used to control the opening and closing of the enthalpy increase control valve according to the operating mode and the detected external ring temperature when the air-conditioning system is turned on.

[0009] According to an air-conditioning system with jet enthalpy increase provided by the present invention, the circulation pipeline further comprises: a four-way valve, a first end of the four-way valve is connected to the exhaust port of the jet enthalpy increase compressor, a second end of the four-way valve is connected to the evaporator, a third end of the four-way valve is connected to the condenser, and a fourth end of the four-way valve is connected to the first air intake port of the jet enthalpy increase compressor;

[0010] The four-way valve is connected to the controller and is used to switch the operating mode of the air-conditioning system.

[0011] According to the jet enthalpy increase air conditioning system provided by the present invention, an electronic expansion valve is provided between the evaporator and the flash evaporator, and the electronic expansion valve is connected to the controller.

[0012] According to an injection enthalpy-increasing air conditioning system provided by the present invention, the enthalpy-increasing control valve is a normally closed solenoid valve with bistable state.

[0013] The present invention also provides a control method for the above-mentioned jet enthalpy increase air conditioning system, comprising:

[0014] When the air conditioning system is turned on, obtaining an operating mode and an external ambient temperature;

[0015] The opening and closing of the enthalpy increase control valve is controlled according to the operation mode and the outer ring temperature.

[0016] According to a control method of an injection enthalpy air conditioning system provided by the present invention, the step of controlling the opening and closing of the enthalpy increase control valve according to the operation mode and the external ring temperature comprises:

[0017] Determining that the operation mode is a heating mode, and the difference between the outer ring temperature and the set temperature is greater than or equal to a first set value, controlling the enthalpy increase control valve to switch from a closed state to an open state;

[0018] Determine that the operating mode is the cooling mode, and control the enthalpy increase control valve to be in a closed state.

[0019] According to a control method of an injection enthalpy air conditioning system provided by the present invention, the step of determining that the operation mode is a heating mode and the difference between the outer ring temperature and the set temperature is greater than or equal to a first set value, and controlling the enthalpy increase control valve to switch from a closed state to an open state includes:

[0020] Determine that the operating mode is the heating mode, and the difference between the outer ring temperature and the set temperature is greater than or equal to the first set value for a duration that exceeds the first set duration, and control the enthalpy increase control valve to switch from a closed state to an open state.

[0021] A control method for an air-conditioning system with jet enthalpy increase according to the present invention further includes:

[0022] When the air conditioning system is running in the heating mode, if the difference between the outer ring temperature and the set temperature is greater than or equal to a second set value, the enthalpy increase control valve is controlled to switch from an open state to a closed state.

[0023] According to a control method of an injection enthalpy air conditioning system provided by the present invention, during the operation of the air conditioning system in a heating mode, if the difference between the outer ring temperature and the set temperature is greater than or equal to a second set value, the step of controlling the enthalpy increase control valve to switch from an open state to a closed state comprises:

[0024] When the air conditioning system is running in heating mode, if the difference between the outer ring temperature and the set temperature is greater than or equal to the second set value and lasts for longer than the second set time, the enthalpy increase control valve is controlled to switch from an open state to a closed state.

[0025] According to a control method of a jet enthalpy air conditioning system provided by the present invention, the step of controlling the opening and closing of the enthalpy increase control valve according to the operation mode and the external ring temperature further includes:

[0026] Determine that the operation mode is switched from the heating mode to the cooling mode, and control the enthalpy increase control valve to be in a closed state.

[0027] The jet enthalpy-increasing air-conditioning system and control method provided by the present invention can completely eliminate the influence of the enthalpy-increasing pipeline on the refrigeration condition and the normal temperature heating condition by setting an enthalpy-increasing control valve in the enthalpy-increasing pipeline of the air-conditioning system and controlling the opening and closing of the enthalpy-increasing control valve according to different operating modes and the outer ring temperature, and can effectively improve the low-temperature heating effect, thereby meeting different operating conditions, and has the characteristics of simple structure, stability and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present invention or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a structural schematic diagram of the jet enthalpy-increasing air-conditioning system provided by the present invention;

[0030] Figure 2 It is a schematic diagram of the refrigeration principle of the jet enthalpy-increasing air-conditioning system provided by the present invention;

[0031] Figure 3 It is a schematic diagram of the low-temperature heating principle of the jet enthalpy-increasing air-conditioning system provided by the present invention;

[0032] Figure 4 It is a schematic diagram of the normal temperature heating principle of the jet enthalpy-increasing air conditioning system provided by the present invention;

[0033] Figure 5 It is a flow chart of the control method of the jet enthalpy increase air conditioning system provided by the present invention.

[0034] Reference numerals:

[0035] 100: circulation pipeline;

[0036] 101: jet enthalpy increase compressor; 1011: exhaust port; 1012: first air intake port;

[0037] 1013: second air intake port; 102: evaporator; 103: flash evaporator;

[0038] 104: condenser; 105: four-way valve; 106: electronic expansion valve;

[0039] 200: enthalpy increase pipeline;

[0040] 201: Enthalpy increase control valve. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the description of the embodiments of the present invention, it should be noted that the terms “first”, “second”, etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0043] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0045] Combine the following Figure 1-Figure 5 The present invention describes the jet enthalpy air conditioning system and control method.

[0046] According to an embodiment of the first aspect of the present invention, referring to Figure 1-Figure 4 As shown, the jet enthalpy-increasing air-conditioning system provided by the present invention mainly includes: a circulation pipeline 100, an enthalpy-increasing pipeline 200, a temperature sensor, a controller, and the like.

[0047] The circulation pipeline 100 mainly includes a jet reheat compressor 101 , an evaporator 102 , a flash evaporator 103 and a condenser 104 which are cyclically connected.

[0048] The enthalpy increase pipeline 200 is connected between the jet enthalpy increase compressor 101 and the flash evaporator 103, and an enthalpy increase control valve 201 is provided in the enthalpy increase pipeline 200, through which the flow path between the jet enthalpy increase compressor 101 and the flash evaporator 103 can be controlled to be open or closed.

[0049] There is no particular restriction on the specific location of the temperature sensor, which is mainly used to detect the external ring temperature, that is, the outdoor ambient temperature.

[0050] The controller is respectively connected to the jet enthalpy increase compressor 101, the enthalpy increase control valve 201 and the temperature sensor. The controller is mainly used to control the opening and closing of the enthalpy increase control valve 201 according to the operating mode and the detected external ring temperature when the air-conditioning system is turned on.

[0051] The working principle of the jet enthalpy air conditioning system of the embodiment of the present invention is described below, which generally includes: cooling mode, low temperature heating mode and normal temperature heating mode. Figure 2-Figure 4 In the direction indicated by the arrow.

[0052] like Figure 2 As shown, when the air-conditioning system is turned on and runs in cooling mode, the enthalpy increase control valve 201 is controlled to be in a closed state, and the enthalpy increase pipeline 200 is disconnected. At this time, the high-temperature and high-pressure gaseous refrigerant generated by the jet enthalpy increase compressor 101 flows into the outdoor condenser 104 to condense and release heat, and the condensed gas-liquid refrigerant enters the flash evaporator 103 for gas-liquid separation. The liquid refrigerant formed by the separated gaseous refrigerant under its own cooling action and the separated liquid refrigerant flow into the indoor evaporator 102 to absorb heat and evaporate, thereby lowering the indoor temperature, and the evaporated gaseous refrigerant flows back to the jet enthalpy increase compressor 101.

[0053] The present invention can avoid the influence of the enthalpy increase pipeline 200 on the refrigeration condition by controlling the enthalpy increase control valve 201 to close to disconnect the enthalpy increase pipeline 200 during refrigeration, thereby ensuring the normal operation of the refrigeration condition.

[0054] like Figure 3As shown, when the air-conditioning system is turned on and runs to the heating mode, and the difference between the detected outer ring temperature and the set temperature is greater than or equal to the first set value, it indicates low-temperature heating. At this time, the enthalpy increase control valve 201 is controlled to switch from the closed state to the open state, and the enthalpy increase pipeline 200 is connected. At this time, the high-temperature and high-pressure gaseous refrigerant generated by the jet enthalpy increase compressor 101 flows into the indoor evaporator 102 to condense and release heat, thereby increasing the indoor temperature. The condensed gas-liquid refrigerant enters the flash evaporator 103 for gas-liquid separation, and the separated gaseous refrigerant flows into the jet enthalpy increase compressor 101 through the enthalpy increase pipeline 200, and the separated liquid refrigerant flows into the outdoor condenser 104 to absorb heat and evaporate, and the evaporated gaseous refrigerant flows back to the jet enthalpy increase compressor 101.

[0055] The present invention controls the enthalpy increase control valve 201 to open during low-temperature heating to conduct the enthalpy increase pipeline 200, so as to replenish air into the jet enthalpy increase compressor 101, thereby effectively improving the low-temperature heating effect.

[0056] like Figure 4 As shown, when the air-conditioning system is in the heating operation process, if the difference between the detected outer ring temperature and the set temperature is greater than or equal to the second set value, it indicates that it is heating at normal temperature. At this time, the enthalpy increase control valve 201 is controlled to switch from the open state to the closed state, thereby disconnecting the enthalpy increase pipeline 200 and restoring the normal heating effect.

[0057] The present invention can avoid the negative impact of the enthalpy increase pipeline 200 on the normal temperature heating condition by controlling the enthalpy increase control valve 201 to close to disconnect the enthalpy increase pipeline 200 during normal temperature heating, thereby ensuring the normal operation of the normal temperature heating condition.

[0058] Therefore, the jet reheat air-conditioning system provided in the embodiment of the present invention can completely eliminate the influence of the reheat increase pipeline 200 on the refrigeration condition and the normal temperature heating condition by setting the reheat increase control valve 201 in the reheat increase pipeline 200 of the air-conditioning system and controlling the opening and closing of the reheat increase control valve 201 according to different operating modes and the outer ring temperature, and can effectively improve the low-temperature heating effect, thereby meeting different operating conditions, and has the characteristics of simple structure, stability and reliability.

[0059] According to one embodiment of the present invention, referring to Figure 1 As shown, the circulation pipeline 100 also includes: a four-way valve 105, a first end a of the four-way valve 105 is connected to the exhaust port 1011 of the jet reheat compressor 101, a second end b of the four-way valve 105 is connected to the evaporator 102, a third end c of the four-way valve 105 is connected to the condenser 104, and a fourth end d of the four-way valve 105 is connected to the first suction port 1012 of the jet reheat compressor 101; and the four-way valve 105 is connected to the controller for switching the operating mode of the air-conditioning system.

[0060] Specifically, the jet reheat compressor 101 is generally provided with an exhaust port 1011 , a first air intake port 1012 and a second air intake port 1013 . The second air intake port 1013 of the jet reheat compressor 101 is connected to the flash evaporator 103 via the reheat control valve 201 .

[0061] When the first end a of the four-way valve 105 is connected to the third end c and the second end b is connected to the fourth end d, the air-conditioning system operates in the cooling mode; correspondingly, when the first end a of the four-way valve 105 is connected to the second end b and the third end c is connected to the fourth end d, the air-conditioning system operates in the heating mode.

[0062] According to one embodiment of the present invention, an electronic expansion valve 106 is provided between the evaporator 102 and the flash evaporator 103 , and the electronic expansion valve 106 is connected to the controller.

[0063] Specifically, the electronic expansion valve 106 mainly plays a throttling role. By controlling the opening of the electronic expansion valve 106, the refrigerant flow rate can be adjusted, thereby adjusting the cooling and heating effects.

[0064] For example, generally speaking, the larger the opening of the electronic expansion valve 106 is, the better the refrigeration effect is.

[0065] According to one embodiment of the present invention, the enthalpy increase control valve 201 is a normally closed solenoid valve with bistable state.

[0066] Specifically, the control logic of the monostable normally closed solenoid valve can be redesigned to make it a bistable normally closed solenoid valve. The original controller's solenoid valve port outputs only two states: 0 (power off) and 1 (power on). In order to facilitate the cyclic output and anti-interference, the control logic is defined as follows: signal A switches from the closed state to the open state, and signal B switches from the open state to the closed state, where 000 represents power off, 001 represents state A, and 011 represents state B. The actual output 0000000000000000000 represents power off, 001001001001001001 represents signal A, and 011011011011011011 represents signal B.

[0067] Since the normally closed solenoid valve needs to be frequently turned on and off, it is easy to be damaged and has poor reliability. In addition, the switching accuracy of the normally closed solenoid valve is low.

[0068] Therefore, the embodiment of the present invention can, without changing the hardware port of the controller, enable the normally closed solenoid valve with only an on-off function to have a bistable function and to be closed when energized without the need to repeatedly turn the power on and off, thereby avoiding damage. The valve also has the characteristics of high precision, and enables the normally closed solenoid valve to have the function of a bistable solenoid valve, which can effectively reduce costs and reduce the complexity of switching.

[0069] The control method of the jet enthalpy air conditioning system provided by the present invention is described below. The control method of the jet enthalpy air conditioning system described below and the jet enthalpy air conditioning system described above can be referred to each other.

[0070] According to an embodiment of the second aspect of the present invention, referring to Figure 5 As shown, the present invention also provides a control method for the jet enthalpy increase air conditioning system of the above embodiment, which mainly includes the following steps:

[0071] S100, when the air conditioning system is turned on, obtaining an operating mode and an external temperature;

[0072] S200, controlling the opening and closing of the enthalpy increase control valve 201 according to the operation mode and the external ring temperature.

[0073] The control method of the jet reheat air-conditioning system provided in the embodiment of the present invention can completely eliminate the influence of the reheat increase pipeline 200 on the refrigeration condition and the normal temperature heating condition by controlling the opening and closing of the reheat increase control valve 201 according to different operating modes and the outer ring temperature, and can effectively improve the low-temperature heating effect, thereby meeting different operating conditions.

[0074] According to one embodiment of the present invention, the step of controlling the opening and closing of the enthalpy increase control valve 201 according to the operation mode and the external ring temperature includes:

[0075] Determine that the operation mode is the heating mode, and the difference between the outer ring temperature and the set temperature is greater than or equal to the first set value, and control the enthalpy increase control valve 201 to switch from the closed state to the open state;

[0076] The operation mode is determined to be the cooling mode, and the enthalpy increase control valve 201 is controlled to be in a closed state.

[0077] Specifically, when the air-conditioning system is turned on and runs in heating mode, and the difference between the external ring temperature and the set temperature is greater than or equal to the first set value, it means that it is a low-temperature heating condition, for example, below -10°C. At this time, by opening the enthalpy increase control valve 201, the enthalpy increase pipeline 200 is connected, so that part of the gaseous refrigerant separated by the flash evaporator 103 can be added to the jet enthalpy increase compressor 101, thereby effectively improving the heating effect.

[0078] When the air conditioning system is turned on and runs in cooling mode, in order to avoid affecting the cooling condition, the enthalpy increase control valve 201 is closed at this time, thereby disconnecting the enthalpy increase pipeline 200 to ensure the normal cooling effect of the air conditioning system.

[0079] According to one embodiment of the present invention, when it is determined that the operation mode is the heating mode and the difference between the outer ring temperature and the set temperature is greater than or equal to the first set value, the step of controlling the enthalpy increase control valve 201 to switch from a closed state to an open state includes:

[0080] Determine that the operation mode is the heating mode, and the difference between the outer ring temperature and the set temperature is greater than or equal to the first set value for a duration exceeding the first set duration, and control the enthalpy increase control valve 201 to switch from the closed state to the open state.

[0081] The present invention can avoid the occurrence of accidental situations by setting the first set time length, effectively improve the control accuracy, and thus ensure the low-temperature heating effect.

[0082] According to one embodiment of the present invention, the control method of the present invention also includes: when the air-conditioning system is operating in heating mode, if the difference between the external ring temperature and the set temperature is greater than or equal to a second set value, controlling the enthalpy increase control valve 201 to switch from an open state to a closed state.

[0083] Specifically, when the air-conditioning system is in the heating operation process, if the difference between the outer ring temperature and the set temperature is greater than or equal to the second set value, it indicates normal temperature heating, for example 5-10°C. At this time, the enthalpy increase control valve 201 is controlled to switch from an open state to a closed state, thereby disconnecting the enthalpy increase pipeline 200, restoring the normal heating effect, and avoiding the negative effect of jet enthalpy increase on normal temperature heating.

[0084] According to one embodiment of the present invention, during the operation of the air conditioning system in the heating mode, if the difference between the external ring temperature and the set temperature is greater than or equal to the second set value, the step of controlling the enthalpy increase control valve 201 to switch from the open state to the closed state includes:

[0085] When the air conditioning system is running in heating mode, if the difference between the external ring temperature and the set temperature is greater than or equal to the second set value and lasts longer than the second set time, the enthalpy increase control valve 201 is controlled to switch from the open state to the closed state.

[0086] The present invention can avoid the occurrence of accidental situations by further setting the second set time length, effectively improve the control accuracy, and thus ensure the normal temperature heating effect.

[0087] According to one embodiment of the present invention, the step of controlling the opening and closing of the enthalpy increase control valve 201 according to the operation mode and the external ring temperature further includes:

[0088] It is determined that the operation mode is switched from the heating mode to the cooling mode, and the enthalpy increase control valve 201 is controlled to be in a closed state.

[0089] Specifically, when the air-conditioning system switches from the heating mode to the cooling mode, the enthalpy increase control valve 201 is closed accordingly to avoid affecting the cooling condition after the switch and ensure the cooling effect.

[0090] The control method of the jet enthalpy increase air conditioning system provided by the present invention is further described below with reference to a specific example, which specifically includes the following steps:

[0091] ① When the air conditioning system is powered off, the enthalpy increase control valve 201 defaults to the power-off state, and is in the default closed state.

[0092] ② When the air conditioning system is turned on and set to cooling mode, the controller does not supply power to the enthalpy increase control valve 201, and it is still in the default closed state.

[0093] ③ When the air-conditioning system is turned on and set to heating mode, and when the external ring temperature is lower than the set temperature by more than 2°C and lasts for more than 1 hour, the controller sends an A signal to the enthalpy increase control valve 201, and the enthalpy increase control valve 201 switches from a closed state to an open state. At this time, the enthalpy increase pipeline 200 begins to circulate, and the heating effect is enhanced.

[0094] ④ During the heating operation of the air-conditioning system, when it is detected that the outer ring temperature is more than 2°C higher than the set temperature and lasts for more than 1 hour, the controller sends a B signal to the enthalpy increase control valve 201, and the enthalpy increase control valve 201 switches from an open state to a closed state, and the air-conditioning system resumes normal heating effect, thereby avoiding the negative effect of jet enthalpy increase on normal temperature heating.

[0095] ⑤ When the air-conditioning system switches directly from heating mode to cooling mode, no matter whether the enthalpy increase control valve 201 is in the A signal state or the B signal state, the controller does not supply power to the enthalpy increase control valve 201. At this time, the enthalpy increase control valve 201 is in the default closed state.

[0096] Therefore, the control method of the jet reheat air-conditioning system provided in the embodiment of the present invention can ensure the normal operation of the refrigeration condition and the normal temperature heating condition by correspondingly controlling the opening and closing of the reheat control valve 201 under different operating modes and external ring temperature conditions, and effectively improve the stability of the low temperature heating condition, thereby improving the low temperature heating effect.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A jet enthalpy air conditioning system, characterized in that: include: A circulation pipeline, including a cyclically connected jet reheat compressor, an evaporator, a flash evaporator and a condenser; An enthalpy increase pipeline is connected between the jet enthalpy increase compressor and the flash evaporator, and an enthalpy increase control valve is provided in the enthalpy increase pipeline; Temperature sensor, used to detect the external ring temperature; The controller is respectively connected to the jet enthalpy increase compressor, the enthalpy increase control valve and the temperature sensor, and is used to control the opening and closing of the enthalpy increase control valve according to the operating mode and the detected external ring temperature when the air-conditioning system is turned on.

2. The jet enthalpy air conditioning system according to claim 1, characterized in that: The circulation pipeline further includes: a four-way valve, a first end of the four-way valve is connected to the exhaust port of the jet enthalpy increasing compressor, a second end of the four-way valve is connected to the evaporator, a third end of the four-way valve is connected to the condenser, and a fourth end of the four-way valve is connected to the first suction port of the jet enthalpy increasing compressor; The four-way valve is connected to the controller and is used to switch the operating mode of the air-conditioning system.

3. The jet enthalpy air conditioning system according to claim 1, characterized in that: An electronic expansion valve is provided between the evaporator and the flash evaporator, and the electronic expansion valve is connected to the controller.

4. The jet enthalpy air conditioning system according to claim 1, characterized in that: The enthalpy increase control valve is a normally closed solenoid valve with bistable state.

5. A control method for an air conditioning system with jet enthalpy increase according to any one of claims 1 to 4, characterized in that: include: When the air conditioning system is turned on, obtaining an operating mode and an external ambient temperature; The opening and closing of the enthalpy increase control valve is controlled according to the operation mode and the outer ring temperature.

6. The control method of the jet enthalpy air conditioning system according to claim 5, characterized in that: The step of controlling the opening and closing of the enthalpy increase control valve according to the operation mode and the outer ring temperature comprises: Determining that the operation mode is a heating mode, and the difference between the outer ring temperature and the set temperature is greater than or equal to a first set value, controlling the enthalpy increase control valve to switch from a closed state to an open state; Determine that the operating mode is the cooling mode, and control the enthalpy increase control valve to be in a closed state.

7. The control method of the jet enthalpy air conditioning system according to claim 6, characterized in that: The step of determining that the operation mode is the heating mode and the difference between the outer ring temperature and the set temperature is greater than or equal to a first set value, and controlling the enthalpy increase control valve to switch from a closed state to an open state, comprises: Determine that the operating mode is the heating mode, and the difference between the outer ring temperature and the set temperature is greater than or equal to the first set value for a duration that exceeds the first set duration, and control the enthalpy increase control valve to switch from a closed state to an open state.

8. The control method of the jet enthalpy air conditioning system according to claim 6, characterized in that: Also includes: When the air conditioning system is running in the heating mode, if the difference between the outer ring temperature and the set temperature is greater than or equal to a second set value, the enthalpy increase control valve is controlled to switch from an open state to a closed state.

9. The control method of the jet enthalpy air conditioning system according to claim 8, characterized in that: The step of controlling the enthalpy increase control valve to switch from an open state to a closed state if the difference between the outer ring temperature and the set temperature is greater than or equal to a second set value during operation of the air conditioning system in the heating mode comprises: When the air conditioning system is running in heating mode, if the difference between the outer ring temperature and the set temperature is greater than or equal to the second set value and lasts for longer than the second set time, the enthalpy increase control valve is controlled to switch from an open state to a closed state.

10. The control method of the jet enthalpy air conditioning system according to claim 6, characterized in that: The step of controlling the opening and closing of the enthalpy increase control valve according to the operation mode and the outer ring temperature further includes: Determine that the operation mode is switched from the heating mode to the cooling mode, and control the enthalpy increase control valve to be in a closed state.

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