Air conditioner air supplementing and enthalpy increasing device, control method and device and air conditioner

Abstract

This invention provides an air conditioner enthalpy-increasing device, control method, apparatus, and air conditioner. The air conditioner includes an outdoor unit, an indoor unit, and the enthalpy-increasing device. A gas pipeline and a liquid pipeline are provided between the outdoor unit and the indoor unit. The outdoor unit includes an outdoor heat exchanger and a compressor. The enthalpy-increasing device is located on the liquid pipeline between the indoor unit and the outdoor heat exchanger. The device further includes: a plate heat exchanger, located on the liquid pipeline, with a second refrigerant inlet and a second refrigerant outlet; and a first gas supply pipeline, with one end connected to the second refrigerant inlet and the second end connected to the liquid pipeline, located between the outdoor heat exchanger and the plate heat exchanger. This invention solves the technical problem of difficulty in controlling refrigerant flow during enthalpy-increasing, which affects the operating efficiency of the air conditioner.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to an air conditioning gas replenishment and enthalpy enhancement device, control method, apparatus, and air conditioner. Background Technology

[0002] Currently, when air conditioners operate in low-temperature conditions, their heating capacity decreases significantly. This is because in low-temperature environments, the air conditioner's compressor compression ratio is too high, the evaporation temperature is too low, and the exhaust temperature is too high. As a result, the air conditioner's heating capacity decreases during operation, thus affecting the heating effect. Usually, the method of supplementing gas to increase enthalpy is used to improve the heating efficiency at low temperatures.

[0003] In existing technologies, the method of increasing enthalpy through gas replenishment involves adding an electronic expansion valve. However, the flow range of a single electronic expansion valve is limited, making it difficult to meet usage requirements. When the maximum flow rate of the electronic expansion valve is too high, while the system requires a low flow rate, the excessively high flow rate of the expansion valve can easily cause fluctuations in the air conditioning system, making it difficult to meet steady-state requirements and thus reducing the operating efficiency of the air conditioner. Summary of the Invention

[0004] This invention can solve the technical problem that the refrigerant flow is difficult to control during the process of replenishing gas and increasing enthalpy in air conditioning, which in turn affects the operating efficiency of air conditioning.

[0005] To address the aforementioned problems, this invention provides an air conditioning gas injection and enthalpy enhancement device. The air conditioner includes an outdoor unit, an indoor unit, and the gas injection and enthalpy enhancement device. A gas pipeline and a liquid pipeline are provided between the outdoor unit and the indoor unit. The outdoor unit includes an outdoor heat exchanger and a compressor. The gas injection and enthalpy enhancement device is located on the liquid pipeline between the indoor unit and the outdoor heat exchanger. The device further includes: a plate heat exchanger, which is located on the liquid pipeline and has a second refrigerant inlet and a second refrigerant outlet; and a first gas injection pipeline, the first end of which is connected to... The second refrigerant inlet is connected to a liquid pipeline, and the second end is located between the outdoor heat exchanger and the plate heat exchanger; the second gas supply pipeline has one end connected to the second refrigerant outlet and the other end connected to the gas supply port of the compressor; wherein, the first gas supply pipeline is equipped with a second expansion valve, a first gas supply expansion valve and a second gas supply expansion valve, and the first gas supply expansion valve and the second gas supply expansion valve are arranged in parallel; the gas supply enthalpy enhancement device can achieve gas supply enthalpy enhancement for the air conditioner through the second expansion valve and the first gas supply expansion valve, and / or through the second expansion valve and the second gas supply expansion valve.

[0006] Compared with existing technologies, the technical effects achieved by this solution are as follows: The parallel connection of the first and second gas replenishment expansion valves in the gas replenishment enthalpy enhancement device enables precise control of the gas replenishment enthalpy enhancement flow rate of the air conditioning system. During this process, the first gas replenishment expansion valve, the second gas replenishment expansion valve, or both valves can be adjusted according to the magnitude of the system's gas replenishment enthalpy enhancement flow rate to meet the gas replenishment enthalpy enhancement requirements of the air conditioning system. In this process, while reducing fluctuations in the air conditioning system, the heating efficiency during low-temperature heating operation is also improved, further stabilizing the heating operation of the air conditioning system.

[0007] Furthermore, in this invention, the plate heat exchanger is also provided with a first refrigerant inlet and a second refrigerant outlet, and the liquid pipeline includes a first liquid pipeline and a second liquid pipeline, wherein one end of the first liquid pipeline is connected to the indoor unit and the other end is connected to the first refrigerant inlet, one end of the second liquid pipeline is connected to the second refrigerant outlet and the other end is connected to the outdoor heat exchanger, and the first gas supply pipeline is connected to the second liquid pipeline.

[0008] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: the first liquid pipeline and the second liquid pipeline enable the gas injection and enthalpy enhancement device to directly deliver refrigerant flow to the compressor; in this process, the heating efficiency during low-temperature heating operation is improved, and the heating operation of the air conditioner is further stabilized.

[0009] Furthermore, in this invention, the gas replenishment and enthalpy enhancement device further includes: a first sensor, which is disposed on the plate heat exchanger near the second refrigerant inlet, for detecting the inlet temperature T of the refrigerant at the second refrigerant inlet. 进 The second sensor is located near the second refrigerant outlet on the plate heat exchanger and is used to detect the refrigerant outlet temperature T at the second refrigerant outlet. 出 .

[0010] Compared with existing technologies, the technical effects achieved by this solution are as follows: the setting of the first and second sensors enables the monitoring of the inlet temperature T at the second refrigerant inlet. 进 And the refrigerant outlet temperature T at the second refrigerant outlet. 出 The detection further involves monitoring the inlet temperature T of the plate heat exchanger. 进 and outlet temperature T 出 After testing, the superheat T of the plate heat exchanger can be obtained. co Meanwhile, based on the superheat T co The size of the valve determines the flow rate of refrigerant in the outdoor unit's pipes, enabling the compressor of the outdoor unit to receive additional gas and increase its enthalpy, thereby stabilizing the heating efficiency of the air conditioner.

[0011] Furthermore, this invention also provides a control method for air conditioner gas replenishment and enthalpy enhancement. This control method is applied to the aforementioned air conditioner gas replenishment and enthalpy enhancement device. The control method includes: when the air conditioner is operating in low-temperature heating mode, adjusting the gas supply according to the inlet temperature T... 进 With outlet temperature T 出 Calculate the superheat T of a plate heat exchanger co According to the superheat T co Determine whether the air conditioner meets the solenoid valve adjustment conditions; if so, control the opening of the first gas replenishment expansion valve and / or control the opening of the second gas replenishment expansion valve.

[0012] Compared with existing technologies, the technical effects achieved by this technical solution are as follows: By controlling the inlet temperature T at the second refrigerant inlet of the plate heat exchanger... 进 And the refrigerant outlet temperature T at the second refrigerant outlet. 出 After testing, the superheat T of the plate heat exchanger can be obtained. co According to the superheat T co The size of the valve determines the flow rate of refrigerant in the outdoor unit's pipes, enabling the compressor of the outdoor unit to receive additional gas and increase its enthalpy, thereby stabilizing the heating efficiency of the air conditioner.

[0013] Furthermore, in this invention, based on the inlet temperature T 进 With outlet temperature T 出 Calculate the superheat T of a plate heat exchanger co Including: superheat T co =Outlet temperature T 出 -Inlet temperature T 进 .

[0014] Compared with existing technologies, the technical effects achieved by this solution are as follows: It is understood that the second refrigerant outlet in the plate heat exchanger is directly connected to the compressor's air inlet via the second air supply pipe. Therefore, the pressure and temperature of the refrigerant flowing from the plate heat exchanger to the compressor will affect the compressor's operating efficiency. Therefore, by controlling the inlet temperature T... 进 and outlet temperature T 出 Testing was conducted to obtain the superheat T. co Subsequently, by adjusting the refrigerant flow rate in the first and second gas supply pipes, the enthalpy of the air conditioner can be increased through gas supply.

[0015] Furthermore, in this invention, controlling the opening degree of the first gas replenishment expansion valve and / or controlling the opening degree of the second gas replenishment expansion valve includes: at a superheat T co The smaller the temperature, the smaller the opening of the first gas replenishment expansion valve, and / or the smaller the opening of the second gas replenishment expansion valve; and / or, at superheat T... coThe larger the value, the greater the opening degree of the first replenishing air expansion valve and / or the second replenishing air expansion valve.

[0016] Compared with existing technologies, the technical effects achieved by adopting this technical solution are: superheat T co The smaller the value, the lower the inlet temperature T of the plate heat exchanger. 进 The smaller the difference between the outlet temperature T and the superheat of the gas supply in the air conditioner, the lower the superheat. This makes the unit prone to liquid return, affecting its reliability. In this case, the superheat T of the plate heat exchanger can be increased by reducing the opening of the first gas supply expansion valve and / or the second gas supply expansion valve. co This method avoids liquid return in the air conditioner; conversely, the superheat T co The larger the value, the higher the inlet temperature T of the plate heat exchanger. 进 With outlet temperature T 出 The larger the difference, the higher the superheat of the air supply in the air conditioner, indicating insufficient air supply and affecting the air supply effect. This can be addressed by increasing the opening of the first and / or second air supply expansion valves to reduce the superheat T of the plate heat exchanger. co This method is used to avoid insufficient gas supply in the air conditioner.

[0017] Furthermore, in this invention, determining whether the air conditioner meets the solenoid valve adjustment conditions includes: at a superheat T co ≤ First preset temperature value T 01 At that time, control the opening of the first replenishing air expansion valve, and / or control the opening of the second replenishing air expansion valve to decrease; and / or, at the first preset temperature value T 01 <Superheat T co ≤Second preset temperature value T 02 At that time, control the first replenishing gas expansion valve, and / or control the second replenishing gas expansion valve to continue operating at the current opening; and / or, at superheat T co >Second preset temperature value T 02 At that time, the opening degree of the first air replenishment expansion valve and / or the second air replenishment expansion valve is increased.

[0018] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: when the superheat T co ≤ First preset temperature value T 01 At this time, it indicates the superheat T in the plate heat exchanger. co If the temperature is relatively low, the superheat T can be increased by controlling the opening of the first gas replenishment expansion valve and / or the second gas replenishment expansion valve. co This ensures the heating efficiency of the air conditioner; the first preset temperature value T 01 <Superheat T co ≤Second preset temperature value T 02At this time, the refrigerant in the liquid pipeline is actually in a gaseous state, ensuring the reliability of the unit and maximizing the air supply. Therefore, within this range, there is no need to adjust the opening of the first and second air supply expansion valves; they can simply operate at their current openings. At superheat T... co >Second preset temperature value T 02 At this time, it indicates the superheat T in the plate heat exchanger. co If the temperature is too high, the superheat T can be increased by controlling the opening of the first replenishing gas expansion valve and / or the second replenishing gas expansion valve. co This ensures the heating efficiency of the air conditioner.

[0019] Furthermore, in this invention, the maximum flow rate Q of the first air replenishment expansion valve... max1 With the maximum flow rate Q of the second replenishment expansion valve max2 different.

[0020] Compared with existing technologies, the technical effects achieved by this technical solution are: the maximum flow rate Q of the first air replenishment expansion valve. max1 With the maximum flow rate Q of the second replenishment expansion valve max2 Unlike other systems, this system enables precise adjustment of the gas replenishment and enthalpy increase flow rate, while also meeting the needs of different flow rates, further improving the operating efficiency of the air conditioner.

[0021] Furthermore, in this invention, the maximum flow rate Q of the first air replenishment expansion valve... max1 With the maximum flow rate Q of the second replenishment expansion valve max2 The following conditions must be met between Q: max1 =γ×Q max2 , where γ is a constant and γ∈[2,3].

[0022] Compared with existing technologies, the technical effects achieved by adopting this technical solution are: ensuring precise control of refrigerant flow, realizing effective control of the opening degree of the first and second gas replenishment expansion valves, and further improving the stability of air conditioning heating operation.

[0023] Furthermore, in this invention, the opening range of the first air replenishment expansion valve and the second air replenishment expansion valve is between [0pls, 480pls].

[0024] Compared with existing technologies, the technical effects achieved by this technical solution are as follows: the opening range of the first gas replenishment expansion valve and the second gas replenishment expansion valve are the same, and when the corresponding flow rates are different, the gas replenishment enthalpy device can meet the needs of different flow rates, thereby ensuring the heating operation efficiency of the air conditioner.

[0025] Furthermore, the present invention also provides an air conditioning control device for executing the above-mentioned air conditioning enthalpy boosting control method. The control device includes: a calculation module for calculating the inlet temperature T during low-temperature heating operation of the air conditioner. 进 With outlet temperature T 出 Calculate the superheat T of a plate heat exchanger co The judgment module is used to determine the superheat T. co The control module determines whether the air conditioner meets the solenoid valve adjustment conditions; when the air conditioner meets the solenoid valve adjustment conditions, it controls and adjusts the opening of the first gas replenishment expansion valve and / or controls and adjusts the opening of the second gas replenishment expansion valve.

[0026] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: when the air conditioning control device executes the air conditioning replenishment enthalpy increase control method, it possesses all the technical features and all the beneficial effects of the control method, which will not be elaborated here.

[0027] Furthermore, the present invention also provides an air conditioner equipped with an air conditioning gas replenishment and enthalpy enhancement device; or the air conditioner includes a computer-readable storage medium storing a computer program and a processor, wherein when the computer program is read by the processor, the above-mentioned air conditioning gas replenishment and enthalpy enhancement control method is implemented.

[0028] Compared with the existing technology, the technical effect achieved by adopting this technical solution is that when the air conditioner is equipped with the above-mentioned air conditioning enthalpy enhancement device, or when the air conditioning enthalpy enhancement control method is implemented, it possesses all the technical features and all the beneficial effects of the air conditioning enthalpy enhancement device and the air conditioning enthalpy enhancement control method, which will not be elaborated here.

[0029] In summary, by adopting the technical solution of the present invention, the following technical effects can be achieved:

[0030] i) The parallel connection of the first and second gas replenishment expansion valves in the gas replenishment enthalpy enhancement device enables precise control of the gas replenishment enthalpy enhancement flow rate of the air conditioning system. During this process, the first gas replenishment expansion valve, the second gas replenishment expansion valve, or both the first and second gas replenishment expansion valves can be selected and adjusted according to the magnitude of the gas replenishment enthalpy enhancement flow rate of the system to meet the gas replenishment enthalpy enhancement requirements of the air conditioning system. In this process, while reducing the fluctuation of the air conditioning system, the heating efficiency during low-temperature heating operation is also improved, further stabilizing the heating operation of the air conditioning system.

[0031] ii) The setting of the first and second sensors enables the monitoring of the inlet temperature T at the second refrigerant inlet. 进 And the refrigerant outlet temperature T at the second refrigerant outlet. 出 The detection further involves monitoring the inlet temperature T of the plate heat exchanger. 进and outlet temperature T 出 After testing, the superheat T of the plate heat exchanger can be obtained. co Meanwhile, based on the superheat T co The size of the valve determines the flow rate of refrigerant in the outdoor unit's pipes, which in turn increases the enthalpy of the compressor in the outdoor unit, thereby stabilizing the heating efficiency of the air conditioner.

[0032] iii) When the superheat T co ≤ First preset temperature value T 01 At this time, it indicates the superheat T in the plate heat exchanger. co If the temperature is relatively low, the superheat T can be increased by controlling the opening of the first gas replenishment expansion valve and / or the second gas replenishment expansion valve. co This ensures the heating efficiency of the air conditioner; the first preset temperature value T o1 <Superheat T co ≤Second preset temperature value T 02 At this time, the refrigerant in the liquid pipeline is actually in a gaseous state, ensuring the reliability of the unit and maximizing the air supply. Therefore, within this range, there is no need to adjust the opening of the first and second air supply expansion valves; they can simply operate at their current openings. At superheat T... co >Second preset temperature value T 02 At this time, it indicates the superheat T in the plate heat exchanger. co If the temperature is too high, the superheat T can be increased by controlling the opening of the first replenishing gas expansion valve and / or the second replenishing gas expansion valve. co This ensures the heating efficiency of the air conditioner. Attached Figure Description

[0033] To more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced below. Obviously, the drawings in the following description are only some of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of the air conditioner provided by the present invention;

[0035] Figure 2 for Figure 1 A schematic diagram of the structure of the gas replenishment and enthalpy enhancement device;

[0036] Figure 3 This is a schematic diagram of the control method for increasing enthalpy by replenishing air in an air conditioner provided by the present invention.

[0037] Explanation of reference numerals in the attached figures

[0038] 100-Air conditioner; 10-Compressor; 20-Gas-liquid separator; 30-Four-way valve; 40-Outdoor heat exchanger; 50-First expansion valve; 60-Gas replenishment and enthalpy enhancement device; 61-Plate heat exchanger; 611-First sensor; 612-Second sensor; 613-First refrigerant inlet; 614-First refrigerant outlet; 615-Second refrigerant inlet; 616-Second refrigerant outlet; 62-First gas replenishment pipeline; 621-Second expansion valve; 622-First gas replenishment expansion valve; 623-Second gas replenishment expansion valve; 63-Second gas replenishment pipeline; 71-Gas pipeline; 711-First control valve; 72-Liquid pipeline; 721-Second control valve; 722-First liquid pipeline; 723-Second liquid pipeline; 80-Outdoor unit; 90-Indoor unit. Detailed Implementation

[0039] To make the objectives, features, and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0040] Preferred, see Figure 1 as well as Figure 2 This invention provides an air conditioner 100, which includes an outdoor unit 80, an indoor unit 90, and a gas injection and enthalpy enhancement device 60. A gas pipe 71 and a liquid pipe 72 are provided between the outdoor unit 80 and the indoor unit 90. The outdoor unit 80 is equipped with an outdoor heat exchanger 40 and a compressor 10. The gas injection and enthalpy enhancement device 60 is located on the liquid pipe 72 and between the indoor unit 90 and the outdoor heat exchanger 40. The gas injection and enthalpy enhancement device 60 is used to inject gas and enhance the enthalpy of the compressor 10. During this process, the heating efficiency of the air conditioner during low-temperature heating operation is ensured, system fluctuations are reduced, and comfort is improved.

[0041] Furthermore, the outdoor unit 80 is also equipped with a gas-liquid separator 20, a four-way valve 30, and a first expansion valve 50; the four-way valve 30 is connected between the compressor 10 and the gas pipeline 71, and the gas-liquid separator 20 is connected between the four-way valve 30 and the compressor 10; at the same time, a first control valve 711 for adjusting the refrigerant flow rate in the gas pipeline 71 is provided on the gas pipeline 71; a second control valve 721 for adjusting the refrigerant flow rate in the liquid pipeline 72 is provided on the liquid pipeline 72, and the second control valve 721 is located between the gas injection enthalpy enhancement device 60 and the indoor unit 90; the first expansion valve 50 is located in the liquid pipeline 72 and is located between the gas injection enthalpy enhancement device 60 and the outdoor heat exchanger 40.

[0042] Preferably, the gas replenishment and enthalpy enhancement device 60 includes: a plate heat exchanger 61, a first gas replenishment pipe 62, and a second gas replenishment pipe 63; the plate heat exchanger 61 is disposed on the liquid pipe 72, and a second refrigerant inlet 615 and a second refrigerant outlet 616 are provided on the plate heat exchanger 61; a first end of the first gas replenishment pipe 62 is connected to the second refrigerant inlet 615, a second end is connected to the liquid pipe 72, and the second end is located between the outdoor heat exchanger 40 and the plate heat exchanger 61; a first end of the second gas replenishment pipe 63 is connected to the second refrigerant outlet 616, and the other end is connected to the gas replenishment port of the compressor 10 (not shown in the figure).

[0043] Furthermore, the plate heat exchanger 61 is also provided with a first refrigerant inlet 613 and a first refrigerant outlet 614. The liquid pipeline 72 includes a first liquid pipeline 722 and a second liquid pipeline 723. One end of the first liquid pipeline 722 is connected to the indoor unit 90 and the other end is connected to the first refrigerant inlet 613. One end of the second liquid pipeline 723 is connected to the first refrigerant outlet 614 and the other end is connected to the outdoor heat exchanger 40. The first gas supply pipeline 62 is connected to the second liquid pipeline 723.

[0044] Furthermore, the first gas supply pipeline 62 is provided with a second expansion valve 621, a first gas supply expansion valve 622, and a second gas supply expansion valve 623, and the first gas supply expansion valve 622 and the second gas supply expansion valve 623 are arranged in parallel; the gas supply enthalpy enhancement device 60 can achieve gas supply enthalpy enhancement for the compressor 1θ through the second expansion valve 621 and the first gas supply expansion valve 622, and / or through the second expansion valve 621 and the second gas supply expansion valve 623.

[0045] It should be noted that during low-temperature heating operation of the air conditioner 100, the refrigerant flow is as follows: A portion of the refrigerant flows from the indoor unit 90 to the liquid pipe 72, then sequentially through the second control valve 721 and the first refrigerant inlet 613 before flowing into the plate heat exchanger 61. It then flows out from the first refrigerant outlet 614 of the plate heat exchanger 61, and subsequently through the first expansion valve 50 and the outdoor heat exchanger 40 before flowing into the four-way valve 30. Finally, it flows from the four-way valve 30 through the gas-liquid separator 20 into the compressor 10. The other path is as follows: the refrigerant in the indoor unit 90 flows from the liquid pipe 72 through the second control valve 721 and the first refrigerant inlet 613... After entering through the refrigerant inlet 613, the refrigerant flows into the plate heat exchanger 61, and then flows out from the first refrigerant outlet 614 of the plate heat exchanger 61. It then flows back into the plate heat exchanger 61 through the first gas supply pipe 62, the second expansion valve 621, the first gas supply expansion valve 622 or the second gas supply expansion valve 623, and then flows into the compressor 10 through the second gas supply pipe 63 from the second refrigerant outlet 616. Finally, after the refrigerant from both paths is compressed in the compressor 10, it flows back into the four-way valve 30, and finally flows back into the indoor unit 90 through the gas pipe 71 and the first control valve 711 to complete the circulation.

[0046] Preferably, the gas replenishment and enthalpy enhancement device 60 further includes: a first sensor 611 and a second sensor 612. The first sensor 611 is disposed on the plate heat exchanger 61 near the second refrigerant inlet 615, and is used to detect the inlet temperature T of the refrigerant at the second refrigerant inlet 615. 进 The second sensor 612 is located on the plate heat exchanger 61 near the second refrigerant outlet 616, and is used to detect the outlet temperature T of the refrigerant at the second refrigerant outlet 616. 出 .

[0047] Preferred, see Figure 3 The present invention also provides a control method for air conditioning gas replenishment and enthalpy enhancement. The control method is applied to the above-mentioned air conditioning gas replenishment and enthalpy enhancement device. Specifically, the control method includes:

[0048] S10: When the air conditioner is operating in low-temperature heating mode, it should be based on the inlet temperature T. 进 With outlet temperature T 出 Calculate the superheat T of a plate heat exchanger co ;

[0049] S20: Based on superheat T co Determine whether the air conditioner meets the solenoid valve adjustment conditions;

[0050] S30: If so, control the opening of the first replenishing air expansion valve and / or control the opening of the second replenishing air expansion valve.

[0051] It should be noted that, in this invention, the inlet temperature T at the second refrigerant inlet 615 of the plate heat exchanger 61 is controlled by... 进 And the refrigerant outlet temperature T at the second refrigerant outlet 616. 出 After testing, the superheat T of plate heat exchanger 61 can be obtained. co Furthermore, based on the superheat T co The size of the valve is controlled to regulate the flow of refrigerant in the pipes of the outdoor unit 80, thereby enabling the compressor 10 of the outdoor unit 80 to receive additional gas and increase its enthalpy, thus stabilizing the heating efficiency of the air conditioner 100.

[0052] Furthermore, in S10, based on the inlet temperature T 进 With outlet temperature T 出 Calculate the superheat T of a plate heat exchanger co Including: superheat T co =Outlet temperature T 出 -Inlet temperature T 进 It is understandable that the second refrigerant outlet 616 in the plate heat exchanger 61 is directly connected to the air supply port of the compressor 10 via the second air supply pipe 63. Therefore, the pressure and temperature of the refrigerant flowing from the plate heat exchanger 61 to the compressor 10 will affect the operating efficiency of the compressor 10. Therefore, by controlling the inlet temperature T... 进 and outlet temperature T 出 Testing was conducted to obtain the superheat T. co Subsequently, by adjusting the refrigerant flow rate in the first gas supply pipe 62 and the second gas supply pipe 63, the enthalpy of the air conditioner 100 can be increased by supplying gas.

[0053] Preferably, in S30, controlling the opening degree of the first replenishing air expansion valve and / or controlling the opening degree of the second replenishing air expansion valve includes:

[0054] S31: At superheat T co The smaller the size, the smaller the opening of the first air replenishment expansion valve and / or the second air replenishment expansion valve.

[0055] S32: At superheat T co The larger the value, the greater the opening degree of the first replenishing air expansion valve and / or the second replenishing air expansion valve.

[0056] In S31, the superheat T co The smaller the value, the lower the inlet temperature (T) of the plate heat exchanger (61). 进The smaller the difference between the outlet temperature T and the superheat of the air supply in the air conditioner 100, the lower the superheat, making the unit prone to liquid return and affecting its reliability. This can be addressed by reducing the opening of the first and / or second air supply expansion valves to increase the superheat T of the plate heat exchanger 61. co This method avoids liquid return in the air conditioner; conversely, in S32, the superheat T co The larger the value, the higher the inlet temperature T of plate heat exchanger 61. 进 With outlet temperature T 出 The larger the difference, the higher the superheat of the supplementary gas in the air conditioner 100, indicating insufficient supplementary gas volume and affecting the supplementary gas effect. This can be addressed by increasing the opening of the first and / or second supplementary gas expansion valves to reduce the superheat T of the plate heat exchanger 61. co This method is used to avoid insufficient gas supply in the air conditioner.

[0057] Preferably, in S20, determining whether the air conditioner meets the solenoid valve adjustment conditions includes:

[0058] S21: At superheat T co ≤ First preset temperature value T 01 At that time, control the opening of the first replenishing air expansion valve and / or control the opening of the second replenishing air expansion valve to decrease;

[0059] S22: At the first preset temperature value T 01 <Superheat T co ≤Second preset temperature value T 02 At that time, control the first replenishing air expansion valve, and / or control the second replenishing air expansion valve to continue operating at the current opening degree;

[0060] S23: At superheat T co >Second preset temperature value T 02 At that time, the opening degree of the first air replenishment expansion valve and / or the second air replenishment expansion valve is increased.

[0061] It needs to be explained that in S21-S23, the first preset temperature value T 01 Satisfy: T 01 ∈(0℃, 2℃], where T 01 The selectable temperatures are 0.5℃, 1℃, 1.5℃, and 2℃; the second preset temperature value T 02 Satisfy: T 02 ∈(2℃, 5℃], where T 02 The selectable temperatures are 2.5℃, 3℃, 3.5℃, 4℃, 4.5℃, and 5℃; when the inlet temperature T of the plate heat exchanger 61... 进 With outlet temperature T 出When the difference between the two values ​​is within (0℃, 2℃), it indicates that the superheat T in the plate heat exchanger 61 is within the range of (0℃, 2℃). co If the temperature is relatively low, the superheat T can be increased by controlling the opening of the first gas replenishment expansion valve and / or the second gas replenishment expansion valve. co This ensures the heating efficiency of the air conditioner 100; furthermore, when the inlet temperature T of the plate heat exchanger 61... 进 With outlet temperature T 出 When the temperature difference is within (2℃, 5℃), the refrigerant is actually in a gaseous state, ensuring the reliability of the unit. Simultaneously, the air supply to the air conditioner 100 is maximized. Therefore, within this range, there is no need to adjust the opening of the first and second air supply expansion valves; they can operate at their current openings. When the inlet temperature T of the plate heat exchanger 61... 进 With outlet temperature T 出 When the difference between the two is greater than 5°C, it indicates that the superheat T in plate heat exchanger 61 is high. co The superheat T can be increased by controlling the opening of the first gas replenishment expansion valve 622 and / or the second gas replenishment expansion valve 623. co This ensures the air conditioner's heating efficiency is 100%; among which, the first preset temperature value T 01 and the second preset temperature value T 02 The size can be determined according to the actual operating efficiency of the air conditioner 100 and the actual needs of the user, and is not limited to the first preset temperature value T in this invention. 01 and the second preset temperature value T 02 Size limitations.

[0062] Preferably, to ensure precise control of the refrigerant flow and achieve effective control of the opening degrees of the first and second gas-fuel expansion valves, the maximum flow rate Q of the first gas-fuel expansion valve is... max1 With the maximum flow rate Q of the second replenishment expansion valve max2 Different; specifically, the maximum flow rate Q of the first replenishment expansion valve. max1 With the maximum flow rate Q of the second replenishment expansion valve max2 The following conditions must be met between Q: max1 =γ×Q max2 , where γ is a constant and γ∈[2,3], where γ can be selected from 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3. Of course, the size of γ can be determined according to the actual operating efficiency of the air conditioner 100 and the actual needs of the user, and is not limited to the limitation of the size of γ in this invention.

[0063] Preferably, the opening range of the first air-replenishing expansion valve 622 and the second air-replenishing expansion valve 623 is between [0 pls, 480 pls]. Although the opening range of the first air-replenishing expansion valve 622 and the second air-replenishing expansion valve 623 is the same, their corresponding flow rates are different. Specifically, the flow rates of the first air-replenishing expansion valve 622 and the second air-replenishing expansion valve 623 are Q1 and Q2, respectively, and the openings of the first air-replenishing expansion valve 622 and the second air-replenishing expansion valve 623 are P1 and P2, respectively.

[0064] (1)Q1-P 1m1 =α×Q max2 ;

[0065] (2)Q1-P 1m2 =β×Q max2 .

[0066] It should be noted that Q1-P 1m1 The first air replenishment expansion valve 622 and its opening degree is P 1m1 The flow rate at time α∈[1.4, 1.6]; where α can be selected as 1.4, 1.5, or 1.6; Q1-150 is the flow rate when the opening of the first air replenishment expansion valve 622 is 300pls; β is the ratio of the flow rate of Q1-150 to the maximum flow rate Q of the second air replenishment expansion valve 623. max2 The multiples of β, ∈ [0.9, 1.1], where β can be selected from 0.9, 1, or 1.1.

[0067] Furthermore, when adjusting the opening of the first gas replenishment expansion valve 622 and the second gas replenishment expansion valve 623, the adjustment of the opening size each time can be adjusted according to ΔP. Considering the different flow rates of the first gas replenishment expansion valve 622 and the second gas replenishment expansion valve 623, and to avoid large fluctuations in the air conditioner 100, the value of ΔP should not be too large. In this invention, ΔP∈(1pls, 10pls], where ΔP can be selected as 2pls, 3pls, 4pls, 5pls, 6pls, 7pls, 8pls, 9pls, or 10pls. The specific value can be determined according to the flow rate of the first gas replenishment expansion valve 622 and the second gas replenishment expansion valve 623 and the actual needs of the user. No unique limitation is made here.

[0068] Preferably, in this invention, segmented control can be adopted according to the magnitude of the gas replenishment enthalpy increase flow rate, adjusting the size of the first gas replenishment expansion valve and the second gas replenishment expansion valve. That is, when the gas replenishment enthalpy increase flow rate demand is large, both the first and second gas replenishment expansion valves are adjusted; when the gas replenishment enthalpy increase flow rate demand is small, only one electronic expansion valve is controlled.

[0069] Table 1: Relationship between the enthalpy increase flow rate of gas replenishment and the opening adjustment of the first and second gas replenishment expansion valves.

[0070]

[0071] Preferably, when the opening degrees of the first gas replenishment expansion valve 622 and the second gas replenishment expansion valve 623 are the same, the flow rate of the first gas replenishment expansion valve 622 is greater than that of the second gas replenishment expansion valve 623. Therefore, when the gas replenishment enthalpy increase flow rate requirements are different, the first gas replenishment expansion valve 622 and the second gas replenishment expansion valve 623 can be adjusted. Specifically, in Table 1, when the gas replenishment enthalpy increase flow rate requirement of the air conditioner 100 is extremely high, the opening degree of the second gas replenishment expansion valve 623 is adjusted to the maximum, that is, the opening degree of the second gas replenishment expansion valve 623 is adjusted to 480pls, and at the same time, the opening degree of the first gas replenishment expansion valve 622 is adjusted to greater than 300pls, thereby meeting the requirements of the air conditioner 100; when the gas replenishment enthalpy increase flow rate requirement of the air conditioner 100 is (extremely high → high) → (high → medium)... When the first gas replenishment expansion valve 622 is adjusted to 300 pls, the opening of the second gas replenishment expansion valve 623 is adjusted according to the gas replenishment enthalpy flow requirement of the air conditioner 100 until the opening is adjusted from 480 pls to 0. Similarly, as the gas replenishment enthalpy flow requirement of the air conditioner 100 changes from large to medium to small, the opening of the first gas replenishment expansion valve 622 and the second gas replenishment expansion valve 623 can be precisely adjusted according to the size of the gas replenishment enthalpy flow requirement. The opening of the first gas replenishment expansion valve 622 can be adjusted from 300 pls to 0 pls, and the opening of the second gas replenishment expansion valve 623 can be adjusted between 0 pls and 480 pls. The specific adjustment size can be referred to Table 1, which will not be elaborated here.

[0072] The present invention also provides an air conditioning control device for executing the above-mentioned air conditioning enthalpy increase control method. The control device includes: a calculation module for calculating the inlet temperature T during low-temperature heating operation of the air conditioner. 进 With outlet temperature T 出 Calculate the superheat Tc of plate heat exchanger 61 o The judgment module is used to determine the superheat T. o The control module determines whether the air conditioner meets the solenoid valve adjustment conditions; when the air conditioner meets the solenoid valve adjustment conditions, it controls and adjusts the opening of the first gas replenishment expansion valve 622 and / or controls and adjusts the opening of the second gas replenishment expansion valve 623.

[0073] Preferably, when the air conditioning control device executes the air conditioning replenishment and enthalpy increase control method, it possesses all the technical features and beneficial effects of the control method, which will not be elaborated here.

[0074] The present invention also provides an air conditioner, wherein the air conditioner is provided with an air conditioner gas replenishment and enthalpy enhancement device; or the air conditioner includes a computer-readable storage medium storing a computer program and a processor, wherein when the computer program is read by the processor, the above-mentioned air conditioner gas replenishment and enthalpy enhancement control method is implemented.

[0075] Preferably, when the air conditioner is equipped with the above-mentioned air conditioning gas replenishment and enthalpy enhancement device, or when it implements the air conditioning gas replenishment and enthalpy enhancement control method, it possesses all the technical features and all the beneficial effects of the air conditioning gas replenishment and enthalpy enhancement device and the air conditioning gas replenishment and enthalpy enhancement control method, which will not be elaborated here.

[0076] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. An air conditioning enthalpy boosting device, wherein the air conditioner (100) includes an outdoor unit (80), an indoor unit (90), and an enthalpy boosting device (60); wherein, A gas pipe (71) and a liquid pipe (72) are provided between the outdoor unit (80) and the indoor unit (90). The outdoor unit (80) is provided with an outdoor heat exchanger (40) and a compressor (10). The feature is that the gas replenishment and enthalpy enhancement device (60) is provided in the liquid pipe (72) and located between the indoor unit (90) and the outdoor heat exchanger (40). The gas replenishment and enthalpy enhancement device (60) further includes: A plate heat exchanger (61) is provided on the liquid pipeline (72), and a second refrigerant inlet (615) and a second refrigerant outlet (616) are provided on the plate heat exchanger (61). The first gas supply pipe (62) has a first end connected to the second refrigerant inlet (615) and a second end connected to the liquid pipe (72), and the second end is located between the outdoor heat exchanger (40) and the plate heat exchanger (61). The second gas supply pipe (63) has one end connected to the second refrigerant outlet (616) and the other end connected to the gas supply port of the compressor (10); The first gas supply pipe (62) is provided with a second expansion valve (621), a first gas supply expansion valve (622), and a second gas supply expansion valve (623), and the first gas supply expansion valve (622) and the second gas supply expansion valve (623) are arranged in parallel; the gas supply enthalpy enhancement device (60) can achieve gas supply enthalpy enhancement for the air conditioner (100) through the second expansion valve (621) and the first gas supply expansion valve (622), and / or through the second expansion valve (621) and the second gas supply expansion valve (623); The maximum flow rate Q of the first air replenishment expansion valve (622) max1 The maximum flow rate Q of the second replenishing expansion valve (623) max2 Different; and the maximum flow rate Q of the first replenishing expansion valve (622) is different. max1 The maximum flow rate Q of the second replenishing expansion valve (623) max2 The following conditions must be met between Q: max1 =γ×Q max2 , where γ is a constant and γ∈[2,3].

2. The air conditioning gas replenishment and enthalpy enhancement device according to claim 1, characterized in that, The plate heat exchanger (61) is also provided with a first refrigerant inlet (613) and a first refrigerant outlet (614). The liquid pipe (72) includes a first liquid pipe (722) and a second liquid pipe (723). One end of the first liquid pipe (722) is connected to the indoor unit (90) and the other end is connected to the first refrigerant inlet (613). One end of the second liquid pipe (723) is connected to the first refrigerant outlet (614) and the other end is connected to the outdoor heat exchanger (40). The first gas supply pipe (62) is connected to the second liquid pipe (723).

3. The air conditioning gas replenishment and enthalpy enhancement device according to claim 2, characterized in that, The gas replenishment and enthalpy enhancement device (60) further includes: The first sensor (611) is disposed on the plate heat exchanger (61) near the second refrigerant inlet (615) and is used to detect the inlet temperature T of the refrigerant at the second refrigerant inlet (615). 进 ; The second sensor (612) is located on the plate heat exchanger (61) near the second refrigerant outlet (616) and is used to detect the outlet temperature T of the refrigerant at the second refrigerant outlet (616). 出 .

4. A method for controlling air conditioning enthalpy enhancement by gas replenishment, characterized in that, The control method is applied to the air conditioning gas replenishment and enthalpy enhancement device as described in claim 3, and the control method includes: When the air conditioner is operating in low-temperature heating mode, it adjusts the temperature according to the inlet temperature T. 进 With the outlet temperature T 出 Calculate the superheat T of the plate heat exchanger (61). co ; According to the superheat T co Determine whether the air conditioner meets the solenoid valve adjustment conditions; If so, the opening degree of the first replenishing expansion valve (622) is controlled and adjusted, and / or the opening degree of the second replenishing expansion valve (623) is controlled and adjusted.

5. The air conditioning enthalpy boosting control method according to claim 4, characterized in that, The inlet temperature T is used as a reference. 进 With the outlet temperature T 出 Calculate the superheat T of the plate heat exchanger (61). co include: The superheat T co =The outlet temperature T 出 -Inlet temperature T 进 .

6. The control method for air conditioning enthalpy enhancement according to claim 4, characterized in that, The control and adjustment of the opening degree of the first replenishing expansion valve (622) and / or the control and adjustment of the opening degree of the second replenishing expansion valve (623) include: At the superheat T co The smaller the size, the smaller the opening degree of the first replenishing expansion valve (622) and / or the second replenishing expansion valve (623); And / or, at the superheat T co The larger the value, the greater the opening degree of the first replenishing expansion valve (622) and / or the second replenishing expansion valve (623).

7. The control method for increasing enthalpy through air conditioning gas replenishment according to claim 5, characterized in that, The determination of whether the air conditioner meets the solenoid valve adjustment conditions includes: At the superheat T co ≤ First preset temperature value T 01 At the same time, the opening degree of the first replenishing air expansion valve (622) and / or the second replenishing air expansion valve (623) is reduced; And / or, at the first preset temperature value T 01 <The superheat T> co ≤Second preset temperature value T 02 At the same time, control the first replenishing air expansion valve (622) and / or control the second replenishing air expansion valve (623) to continue operating at the current opening; And / or, at the superheat T co >Second preset temperature value T 02 At the same time, the opening degree of the first replenishing air expansion valve (622) and / or the second replenishing air expansion valve (623) is increased.

8. The control method for air conditioning enthalpy enhancement according to any one of claims 4-7, characterized in that, The opening range of the first air replenishment expansion valve (622) and the second air replenishment expansion valve (623) is between [0pls, 480pls].

9. An air conditioning control device, characterized in that, The air conditioning control device is used to execute the air conditioning enthalpy enhancement control method as described in any one of claims 4-8, and the control device includes: The calculation module is used to calculate the inlet temperature T when the air conditioner is operating in low-temperature heating mode. 进 With the outlet temperature T 出 Calculate the superheat T of the plate heat exchanger (61). co ; The judgment module is used to determine the superheat T based on the superheat T. co Determine whether the air conditioner meets the solenoid valve adjustment conditions; The control module is used to control and adjust the opening of the first gas replenishment expansion valve (622) and / or control and adjust the opening of the second gas replenishment expansion valve (623) when the air conditioner meets the solenoid valve adjustment conditions.

10. An air conditioner, characterized in that, The air conditioner is provided with an air conditioning gas replenishment and enthalpy enhancement device as described in any one of claims 1-3; or the air conditioner includes a computer-readable storage medium storing a computer program and a processor, wherein when the computer program is read by the processor, the air conditioning gas replenishment and enthalpy enhancement control method as described in any one of claims 4-8 is implemented.

Images