Dual-electronic expansion valve and air conditioning system

Abstract

The utility model relates to the technical field of refrigeration equipment control, provides a double electronic expansion valve and an air conditioning system, and is applied to a heat exchanger comprising a first heat exchange unit and a second heat exchange unit. The second electronic expansion valve is communicated with the second heat exchange unit; the first sensor is arranged on the first heat exchange unit, and the second sensor is arranged on the second heat exchange unit; and the controller is electrically connected with the first sensor, the second sensor, the first electronic expansion valve and the second electronic expansion valve, and the controller can be switched between a first state and a second state. The flow of refrigerants entering the first heat exchange unit and the second heat exchange unit can be accurately adjusted, it is ensured that the first heat exchange unit and the second heat exchange unit can obtain proper refrigerant supply under different working conditions, and therefore the heat exchange efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration equipment control, in particular to a double electronic expansion valve and an air conditioning system. Background Art

[0002] With the continuous development of refrigeration and air conditioning technology, side-outlet heat pump units are increasingly used in large commercial and industrial fields. These units usually exchange heat with the air through upper and lower double heat exchangers to achieve cooling or heating functions. In order to improve heat exchange efficiency and unit capacity, a single electronic expansion valve is usually used to adjust the refrigerant flow at two locations. By simultaneously controlling the refrigerant flow entering the upper and lower heat exchangers, more accurate and flexible temperature control can be achieved.

[0003] However, in a side-outlet heat pump unit with a larger capacity, the large amount of refrigerant in the system, the fast flow rate, and the influence of gravity often lead to an imbalance in the amount of refrigerant in the upper and lower double heat exchangers. This imbalance will further lead to inconsistent heat exchange between the upper and lower heat exchangers, thus affecting the energy efficiency of the entire unit. Specifically, when the amount of refrigerant in the upper heat exchanger is too much, its heat exchange efficiency will decrease, and the lower heat exchanger may not be able to meet the heat exchange demand due to insufficient refrigerant. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the related art. To this end, the utility model proposes a dual electronic expansion valve to solve the problem of unbalanced refrigerant volume in the upper and lower dual heat exchangers.

[0005] According to the first aspect of the present invention, a dual electronic expansion valve is provided, which is applied to a heat exchanger including a first heat exchange unit and a second heat exchange unit. The dual electronic expansion valve includes:

[0006] a first electronic expansion valve, connected to the first heat exchange unit;

[0007] a second electronic expansion valve, connected to the second heat exchange unit;

[0008] a first sensor and a second sensor, wherein the first sensor is disposed in the first heat exchange unit, and the second sensor is disposed in the second heat exchange unit;

[0009] a controller, electrically connected to the first sensor, the second sensor, the first electronic expansion valve and the second electronic expansion valve, the controller controlling the dual electronic expansion valve to switch between a first state and a second state;

[0010] In the first state, the controller is configured to control the first electronic expansion valve to reduce its opening and control the second electronic expansion valve to increase its opening; in the second state, the controller is configured to control the first electronic expansion valve to increase its opening and control the second electronic expansion valve to reduce its opening.

[0011] The dual electronic expansion valve provided by the utility model can accurately adjust the refrigerant flow entering the first heat exchange unit and the second heat exchange unit by respectively controlling the opening of the first electronic expansion valve and the second electronic expansion valve according to the detection results of the first sensor and the second sensor, thereby ensuring that the first heat exchange unit and the second heat exchange unit can obtain appropriate refrigerant supply under different working conditions, thereby improving the heat exchange efficiency.

[0012] According to one embodiment of the utility model, the first electronic expansion valve includes a first valve body, a first valve core and a first driving member, the first valve body is configured with a first inlet and a first outlet connected to the first heat exchange unit, the first valve core is movably arranged in the first valve body, one end of the first valve core is arranged corresponding to the first inlet, the first driving member is transmission-connected to the first valve core and electrically connected to the controller so as to adjust the size of the first inlet according to the controller driving the first valve core.

[0013] With this design, when the controller determines that the refrigerant flow needs to be adjusted based on the sensor data, it can control the first drive member to drive the first valve core to move, thereby adjusting the size of the first inlet. This precise adjustment mechanism enables the system to quickly respond to changes in the heat exchanger, maintain the optimal distribution of the refrigerant flow, and thus improve the heat exchange efficiency.

[0014] According to an embodiment of the utility model, a first thread and a second thread are formed in the first valve body;

[0015] The first valve core is movably disposed in the first valve body via the first thread and the second thread.

[0016] In this embodiment, the first thread and the second thread are precisely matched with the first valve core, which is conducive to improving the activity accuracy of the first valve core, so that the first electronic expansion valve can achieve accurate control of the refrigerant flow. This precise control helps to ensure that the first heat exchange unit can obtain appropriate refrigerant supply under different working conditions, thereby improving heat exchange efficiency.

[0017] According to an embodiment of the present utility model, the first driving member is a first motor, and a driving end of the first motor is connected to the first valve core.

[0018] According to one embodiment of the utility model, the second electronic expansion valve includes a second valve body, a second valve core and a second driving member, the second valve body is configured with a second inlet and a second outlet connected to the second heat exchange unit, the second valve core is movably arranged in the second valve body, one end of the second valve core is arranged corresponding to the second inlet, and the second driving member is transmission-connected to the second valve core and electrically connected to the controller so as to adjust the size of the second inlet according to the controller driving the second valve core.

[0019] Through the close cooperation between the second driving member and the second valve core, the second electronic expansion valve can realize accurate control of the refrigerant flow rate, which helps to ensure that the second heat exchange unit can obtain appropriate refrigerant supply under different working conditions, thereby improving the heat exchange efficiency.

[0020] According to an embodiment of the utility model, a third thread and a fourth thread are formed in the second valve body;

[0021] The second valve core is movably disposed in the second valve body via the third thread and the fourth thread.

[0022] In this embodiment, the third thread and the fourth thread are precisely matched with the second valve core, which is conducive to improving the activity accuracy of the second valve core, so that the second electronic expansion valve can achieve accurate control of the refrigerant flow. This precise control helps to ensure that the second heat exchange unit can obtain appropriate refrigerant supply under different working conditions, thereby improving heat exchange efficiency.

[0023] According to an embodiment of the present utility model, the second driving member is a second motor, and a driving end of the second motor is connected to the second valve core.

[0024] According to an embodiment of the present invention, the first sensor and the second sensor are temperature sensors.

[0025] According to an embodiment of the present invention, the first sensor and the second sensor are pressure sensors.

[0026] According to the second aspect of the present invention, an air conditioning system is provided, comprising:

[0027] The heat exchanger comprises a first heat exchange unit and a second heat exchange unit; and a dual electronic expansion valve.

[0028] The air-conditioning system provided by the utility model can accurately adjust the refrigerant flow entering the first heat exchange unit and the second heat exchange unit by adopting the dual electronic expansion valve of the first aspect, ensuring that the first heat exchange unit and the second heat exchange unit can obtain appropriate refrigerant supply under different working conditions, thereby improving heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0030] Figure 1 A schematic structural diagram of a dual electronic expansion valve provided in an embodiment of the utility model.

[0031] Figure 2 A schematic structural diagram of a first electronic expansion valve provided in an embodiment of the utility model.

[0032] Figure 3 This is a schematic structural diagram of a second electronic expansion valve provided in an embodiment of the utility model.

[0033] Reference numerals:

[0034] 1. Dual electronic expansion valve; 11. First electronic expansion valve; 111. First valve body; 112. First valve core; 113. First inlet; 114. First outlet; 115. First thread; 116. Second thread; 12. Second electronic expansion valve; 121. Second valve body; 122. Second valve core; 123. Second inlet; 124. Second outlet; 125. Third thread; 126. Fourth thread; 13. First sensor; 14. Second sensor; 15. Controller; 2. Heat exchanger; 21. First heat exchange unit; 22. Second heat exchange unit. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution in the utility model will be clearly described below in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] According to the first aspect of the utility model, the dual electronic expansion valve provided by the embodiment is as follows: Figures 1 to 3 As shown, the dual electronic expansion valve 1 is applied to a heat exchanger 2 including a first heat exchange unit 21 and a second heat exchange unit 22 .

[0037] like Figure 1As shown, the dual electronic expansion valve 1 includes: a first electronic expansion valve 11, a second electronic expansion valve 12, a first sensor 13, a second sensor 14 and a controller 15. The first electronic expansion valve 11 is arranged on the refrigerant flow path of the first heat exchange unit 21, and is used to control the refrigerant flow entering the first heat exchange unit 21; the second electronic expansion valve 12 is arranged on the refrigerant flow path of the second heat exchange unit 22, and is used to control the refrigerant flow entering the second heat exchange unit 22.

[0038] The first sensor 13 is disposed in the first heat exchange unit 21 for real-time monitoring of the temperature, pressure or other relevant parameters of the first heat exchange unit. The second sensor 14 is disposed in the second heat exchange unit 22 for real-time monitoring of the temperature, pressure or other relevant parameters of the second heat exchange unit.

[0039] The controller 15 is electrically connected to the first sensor 13 , the second sensor 14 , the first electronic expansion valve 11 and the second electronic expansion valve 12 , and is used to dynamically adjust the opening of the two electronic expansion valves according to real-time data monitored by the first sensor 13 and the second sensor 14 .

[0040] Specifically, the first sensor 13 and the second sensor 14 respectively monitor relevant parameters of the first heat exchange unit 21 and the second heat exchange unit 22 in real time, and transmit the data to the controller 15 .

[0041] The controller 15 determines whether the refrigerant flow of the second heat exchange unit is balanced according to the received data, and controls the dual electronic expansion valve to switch between the first state and the second state according to the determination result. If the refrigerant flow of the first heat exchange unit is excessive and the refrigerant flow of the second heat exchange unit is insufficient, the controller 15 controls the dual electronic expansion valve to switch to the first state; otherwise, the controller controls the dual electronic expansion valve to switch to the second state.

[0042] Opening adjustment: In the first state, the controller 15 controls the first electronic expansion valve 11 to reduce the opening to reduce the refrigerant flow entering the first heat exchange unit 21; at the same time, the controller 15 controls the second electronic expansion valve 12 to increase the opening to increase the refrigerant flow entering the second heat exchange unit 22. In the second state, the controller 15 controls the first electronic expansion valve 11 to increase the opening to increase the refrigerant flow entering the first heat exchange unit 21; at the same time, the controller 15 controls the second electronic expansion valve 12 to reduce the opening to reduce the refrigerant flow entering the second heat exchange unit 22.

[0043] The dual electronic expansion valve provided by the utility model can accurately adjust the refrigerant flow entering the first heat exchange unit 21 and the second heat exchange unit 22 by respectively controlling the opening of the first electronic expansion valve 11 and the second electronic expansion valve 12 according to the detection results of the first sensor 13 and the second sensor 14, thereby ensuring that the first heat exchange unit 21 and the second heat exchange unit 22 can obtain appropriate refrigerant supply under different working conditions, thereby improving the heat exchange efficiency.

[0044] In some embodiments, Figure 2 As shown, the first electronic expansion valve 11 includes a first valve body 111, a first valve core 112 and a first driving member. The first valve body 111 is constructed with a first inlet 113 and a first outlet 114 connected to the first heat exchange unit 21. The first valve core 112 is movably arranged in the first valve body 111, and one end of the first valve core 112 is arranged opposite to the first inlet 113. The first driving member is transmission-connected to the first valve core 112 and electrically connected to the controller 15 so as to adjust the size of the first inlet 113 according to the controller 15 driving the first valve core 112.

[0045] Specifically, the first valve body 111 constitutes the outer shell of the expansion valve, providing support and protection for the internal valve core and driving member. The first valve body 111 is constructed with a first inlet 113 and a first outlet 114 connected to the first heat exchange unit 21. The first valve core 112 is movably arranged in the first valve body 111. This mobility allows the valve core to adjust its position as needed, thereby changing the size of the first inlet 113. One end of the first valve core 112 is located at a corresponding setting of the first inlet 113, so that when the first valve core 112 moves toward the direction close to the first inlet 113, the refrigerant flow area of ​​the first inlet 113 can be reduced. When the first valve core 112 moves toward the direction away from the first inlet 113, the refrigerant flow area of ​​the first inlet 113 can be increased to control the flow of the refrigerant through the expansion valve.

[0046] The first driving member is in driving connection with the first valve core 112, and the action of the first driving member can be directly transmitted to the first valve core 112 to move it. At the same time, the first driving member is electrically connected to the controller 15, so that the controller 15 can accurately control the action of the first driving member according to the real-time monitored data and the preset control logic.

[0047] With this design, when the controller 15 determines that the refrigerant flow needs to be adjusted based on the sensor data, it can control the first driving member to drive the first valve core 112 to move, thereby adjusting the size of the first inlet 113. This precise adjustment mechanism enables the system to quickly respond to changes in the heat exchanger, maintain the optimal distribution of the refrigerant flow, and thus improve the heat exchange efficiency.

[0048] In some embodiments, Figure 2 As shown, a first thread 115 and a second thread 116 are formed in the first valve body 111 ; the first valve core 112 is movably disposed in the first valve body 111 via the first thread 115 and the second thread 116 .

[0049] The first thread 115 and the second thread 116 are designed in the first valve body 111. The first thread 115 and the second thread 116 provide a precise track and stable support for the movement of the first valve core 112. The first valve core 112 is closely matched with the first valve body 111 through the first thread 115 and the second thread 116, ensuring that its movement in the first valve body 111 is both stable and precise. Through this structure, the first valve core 112 performs precise linear movement in the first valve body 111, thereby accurately controlling the size of the first inlet 113.

[0050] If the first valve core 112 needs to be adjusted or replaced, the design of the threaded structure makes this process relatively simple. Maintenance personnel can easily adjust or replace the first valve core 112 by rotating it, which reduces the difficulty and cost of maintenance.

[0051] In summary, the design of the first thread 115 and the second thread 116 in the first valve body 111 of the first electronic expansion valve 11 not only improves the movement accuracy and stability of the first valve core 112, but also makes the entire structure easier to maintain and adjust.

[0052] The first driving member is a first motor, and the driving end of the first motor is connected to the first valve core 112. When the first motor receives the command signal from the controller 15, it starts to rotate in a preset direction and speed. This rotation is transmitted to the first valve core 112 through the driving end, so that the first valve core 112 performs precise linear motion in the first valve body 111.

[0053] In some embodiments, Figure 3 As shown, the second electronic expansion valve 12 includes a second valve body 121, a second valve core 122 and a second driving member. The second valve core 122 is constructed with a second inlet 123 and a second outlet 124 connected to the second heat exchange unit 22. The second valve core 122 is movably arranged in the second valve body 121, and one end of the second valve core 122 is arranged corresponding to the second inlet 123. The second driving member is transmission-connected to the second valve core 122 and electrically connected to the controller 15 so as to adjust the size of the second inlet 123 according to the controller 15 driving the second valve core 122.

[0054] In this embodiment, the second valve body 121 is the shell of the expansion valve, and the second valve body 121 provides a stable working environment for the second valve core 122 and the second driving member inside. The second valve core 122 is configured with a second inlet 123 and a second outlet 124, wherein the second inlet 123 is used to receive the refrigerant from the upstream, and the second outlet 124 is connected to the second heat exchange unit 22 to transport the refrigerant to the unit for heat exchange.

[0055] One end of the second valve core 122 is located corresponding to the second inlet 123, so that when the second valve core 122 moves toward the direction close to the second inlet 123, the refrigerant flow area of ​​the second inlet 123 can be reduced. When the second valve core 122 moves toward the direction away from the second inlet 123, the refrigerant flow area of ​​the second inlet 123 can be increased to control the flow of the refrigerant through the expansion valve.

[0056] The second driving member is similar to the first electronic expansion valve 11, and the second electronic expansion valve 12 also uses a driving member to control the movement of the valve core. The second driving member is in transmission connection with the second valve core 122, and can adjust the position of the second valve core 122 according to the instruction of the controller, thereby changing the size of the second inlet 123, and realizing accurate control of the refrigerant flow.

[0057] The second driving member is not only in driving connection with the second valve core 122, but also electrically connected with the controller 15. The controller 15 can monitor the state (such as temperature, pressure, etc.) of the second heat exchange unit 22 in real time, and adjust the output of the second driving member according to this information, so as to realize accurate control of the second electronic expansion valve 12.

[0058] The second electronic expansion valve 12 can achieve accurate control of the refrigerant flow rate through the close cooperation between the second driving member and the second valve core 122. This helps to ensure that the second heat exchange unit 22 can obtain appropriate refrigerant supply under different working conditions, thereby improving heat exchange efficiency.

[0059] In some embodiments, Figure 3 As shown, a third thread 125 and a fourth thread 126 are formed in the second valve body 121 ; the second valve core 122 is movably disposed in the second valve body 121 via the third thread 125 and the fourth thread 126 .

[0060] Among them, a third thread 125 and a fourth thread 126 are designed in the second valve body 121. The third thread 125 and the fourth thread 126 not only provide a precise track for the movement of the second valve core 122, but also ensure the stability and sealing of the valve core during the movement. The second valve core 122 is constructed with a thread structure that matches the third thread 125 and the fourth thread 126, so that the second valve core 122 can perform precise linear movement along the thread in the second valve body 121.

[0061] One end of the second valve core 122 is located at the second inlet 123 . When the second valve core 122 moves under the guidance of the thread, it can directly control the size of the second inlet 123 , thereby changing the amount of refrigerant passing through the second electronic expansion valve 12 .

[0062] In this embodiment, the third thread 125 and the fourth thread 126 are precisely matched with the second valve core 122, which is conducive to improving the movement accuracy of the second valve core 122, so that the second electronic expansion valve 12 can achieve accurate control of the refrigerant flow. This precise control helps to ensure that the second heat exchange unit 22 can obtain appropriate refrigerant supply under different working conditions, thereby improving heat exchange efficiency.

[0063] The second driving member is a second motor, and the driving end of the second motor is connected to the second valve core 122. The second motor serves as a driving source of the second electronic expansion valve 12, and is responsible for providing power to drive the movement of the second valve core 122. The driving end of the second motor is directly connected to the second valve core 122, so that the rotation of the second motor can be directly converted into the linear movement of the second valve core 122.

[0064] During operation, when the controller 15 receives an instruction to adjust the refrigerant flow rate, it sends a corresponding control signal to the second motor. After receiving the control signal, the second motor starts to rotate in the specified direction and speed. Since the driving end of the motor is directly connected to the second valve core 122, the rotation of the second motor will drive the second valve core 122 to perform linear motion. As the second valve core 122 moves, the size of the second inlet 123 will change, thereby achieving precise control of the refrigerant flow rate.

[0065] In some embodiments, Figures 1 to 3 As shown, the first sensor 13 and the second sensor 14 are temperature sensors. The two sensors are used to detect the temperatures of the two heat exchange units, respectively, and dynamically adjust the openings of the first electronic expansion valve 11 (LEV1) and the second electronic expansion valve 12 (LEV2) according to the temperature changes. For example, the heat exchanger 2 is a fin heat exchanger, and the first sensor 13 is arranged on the fin of the first heat exchange unit 21, and is used to detect the fin temperature of the first heat exchange unit 21. The second sensor 14 is arranged on the fin of the second heat exchange unit 22, and is used to detect the fin temperature of the second heat exchange unit 22.

[0066] The initial temperature detected by the first sensor 13 is TE1, and TE1-H is the temperature detected after H seconds. The initial temperature detected by the second sensor 14 is TE2, and TE2-H is the temperature detected after H seconds.

[0067] A constant temperature interval (A, B) and K are introduced, where A, B and K are all preset constants.

[0068] This embodiment is described by taking the heat exchanger 2 as an evaporator in a heating system as an example. When TE1-TE2>B, it means that the temperature of the first heat exchange unit 21 is much higher than the temperature of the second heat exchange unit 22, and the amount of refrigerant in the upper fin unit is also greater than the fin temperature of the second heat exchange unit. At this time, in order to balance the temperatures of the two heat exchange units, LEV1 executes the valve closing logic, and the valve closing rate is C Pls / min to reduce the refrigerant flow of the first heat exchange unit 21; at the same time, LEV2 executes the valve opening logic, and the valve opening rate is DPls / min to increase the refrigerant flow of the second heat exchange unit 22.

[0069] When TE1-TE2<A, it means that the temperature of the second heat exchange unit 22 is much higher than that of the first heat exchange unit 21. At this time, in order to balance the temperatures of the two heat exchange units, LEV1 executes the valve opening logic with a valve opening rate of E Pls / min to increase the refrigerant flow of the first heat exchange unit 21; at the same time, LEV2 executes the valve closing logic with a valve closing rate of F Pls / min to reduce the refrigerant flow of the second heat exchange unit 22.

[0070] When A≤TE1-TE2≤B, it means that the temperature difference between the two heat exchange units is within an acceptable range. At this time, there is no need to adjust the opening of LEV1 and LEV2, and they will maintain the current state.

[0071] When the heat exchanger 2 is used as a condenser in a refrigeration system, when TE1-TE2>B, it means that the temperature of the second heat exchange unit 22 is much lower than that of the first heat exchange unit 21, and the amount of refrigerant in the first heat exchange unit 21 is less than that in the second heat exchange unit. At this time, in order to balance the temperatures of the two heat exchange units, LEV1 executes the valve opening logic, and the valve opening rate is GPls / min to increase the refrigerant flow of the first heat exchange unit 21; at the same time, LEV2 executes the valve closing logic, and the valve closing rate is HPls / min to reduce the refrigerant flow of the second heat exchange unit 22.

[0072] When TE1-TE2<A, it means that the temperature of the first heat exchange unit is much lower than that of the second heat exchange unit, and the refrigerant volume of the first heat exchange unit is higher than that of the second heat exchange unit. At this time, in order to balance the temperatures of the two heat exchange units, LEV1 executes the valve closing logic with a valve closing rate of IPls / min to reduce the refrigerant flow of the first heat exchange unit; at the same time, LEV2 executes the valve opening logic with a valve opening rate of J Pls / min to increase the refrigerant flow of the second heat exchange unit.

[0073] It should be noted that the priority of the temperature control logic in the system should be set to the second level to ensure that it can be executed in the predetermined priority order when it conflicts with other control logics (such as safety protection logic, system startup logic, etc.). This can ensure the stability and safety of the system while achieving efficient temperature control.

[0074] In another embodiment, the first sensor 13 and the second sensor 14 are pressure sensors. The two sensors are used to detect the refrigerant pressure in the two heat exchange units (such as the first heat exchange unit 21 and the second heat exchange unit 22). Pressure data is an important parameter for evaluating system performance and refrigerant flow distribution because it directly affects heat exchange efficiency and system stability.

[0075] The initial pressure detected by the pressure sensor 13 is PE1, and PE1-H is the pressure detected after H seconds. Similarly, the initial pressure detected by the pressure sensor 14 is PE2, and PE2-H is the pressure detected after H seconds.

[0076] In order to control the refrigerant pressure distribution in the system, a constant pressure interval (P_A, P_B) is introduced, where P_A and P_B are preset constants representing the desired pressure range.

[0077] When PE1-PE2>P_B and PE1-H-PE1>P_K, it means that the refrigerant pressure in the first heat exchange unit 21 is much higher than that in the second heat exchange unit 22, and the pressure of the first heat exchange unit 21 drops significantly within H seconds. At this time, in order to balance the pressure of the two heat exchange units, LEV1 executes the valve closing logic with a valve closing rate of C_P Pls / min to reduce the refrigerant flow of the first heat exchange unit 21; at the same time, LEV2 executes the valve opening logic with a valve opening rate of D_P Pls / min to increase the refrigerant flow of the second heat exchange unit 22.

[0078] When PE1-PE2<P_A and PE2-H-PE2>P_L, it means that the refrigerant pressure in the second heat exchange unit 22 is much higher than that in the first heat exchange unit 21, and the pressure of the second heat exchange unit 22 drops significantly within H seconds. At this time, in order to balance the pressure of the two heat exchange units, LEV1 executes the valve opening logic, and the valve opening rate is E_P Pls / min to increase the refrigerant flow of the first heat exchange unit 21; at the same time, LEV2 executes the valve closing logic, and the valve closing rate is F_P Pls / min to reduce the refrigerant flow of the second heat exchange unit 22.

[0079] When P_A≤PE1-PE2≤P_B and P_A≤PE1-H-PE2≤P_B, it means that the pressure difference between the two heat exchange units is within an acceptable range. At this time, there is no need to adjust the opening of LEV1 and LEV2, and they will remain in the current state.

[0080] It should be noted that the pressure control logic also needs to be coordinated and prioritized with other control logics (such as safety protection logic, system startup logic, etc.). This can be done by setting different logic priorities to ensure that the system remains safe and efficient in various working conditions. In addition, it is also necessary to adjust and optimize these parameters (such as P_A, P_B, C_P, D_P, E_P, F_P, P_K, P_L) according to the specific system design and operating conditions to obtain the best performance and stability.

[0081] According to the second aspect of the present invention, an air conditioning system is provided. Figure 1 The air conditioning system shown includes a heat exchanger 2 and a dual electronic expansion valve 1 .

[0082] The heat exchanger 2 includes a first heat exchange unit 21 and a second heat exchange unit 22. Figure 1 As shown, the dual electronic expansion valve 1 includes: a first electronic expansion valve 11, a second electronic expansion valve 12, a first sensor 13, a second sensor 14 and a controller 15. The first electronic expansion valve 11 is in communication with the first heat exchange unit 21; the second electronic expansion valve 12 is in communication with the second heat exchange unit 22; the first sensor 13 is arranged in the first heat exchange unit 21, and the second sensor is arranged in the second heat exchange unit 22; the controller 15 is electrically connected with the first sensor 13, the second sensor 14, the first electronic expansion valve 11 and the second electronic expansion valve 12, and the controller 15 has a first state and a second state; in the first state, the controller 15 is configured to control the first electronic expansion valve 11 to reduce the opening degree and control the second electronic expansion valve 12 to increase the opening degree; in the second state, the controller 15 is configured to control the first electronic expansion valve 11 to increase the opening degree and control the second electronic expansion valve 12 to reduce the opening degree.

[0083] The air-conditioning system provided by the utility model can accurately adjust the refrigerant flow entering the first heat exchange unit 21 and the second heat exchange unit 22 by respectively controlling the opening of the first electronic expansion valve 11 and the second electronic expansion valve 12 according to the detection results of the first sensor 13 and the second sensor 14, thereby ensuring that the first heat exchange unit 21 and the second heat exchange unit 22 can obtain appropriate refrigerant supply under different working conditions, thereby improving the heat exchange efficiency.

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A dual electronic expansion valve, characterized in that: Applicable to a heat exchanger including a first heat exchange unit and a second heat exchange unit, the dual electronic expansion valve includes: a first electronic expansion valve, connected to the first heat exchange unit; a second electronic expansion valve, connected to the second heat exchange unit; a first sensor and a second sensor, wherein the first sensor is disposed in the first heat exchange unit, and the second sensor is disposed in the second heat exchange unit; a controller, electrically connected to the first sensor, the second sensor, the first electronic expansion valve and the second electronic expansion valve, the controller controlling the dual electronic expansion valve to switch between a first state and a second state; In the first state, the controller is configured to control the first electronic expansion valve to reduce its opening and control the second electronic expansion valve to increase its opening; in the second state, the controller is configured to control the first electronic expansion valve to increase its opening and control the second electronic expansion valve to reduce its opening.

2. The dual electronic expansion valve according to claim 1, characterized in that: The first electronic expansion valve includes a first valve body, a first valve core and a first driving member. The first valve body is configured with a first inlet and a first outlet connected to the first heat exchange unit. The first valve core is movably arranged in the first valve body. One end of the first valve core is arranged corresponding to the first inlet. The first driving member is transmission-connected to the first valve core and electrically connected to the controller so as to adjust the size of the first inlet according to the controller driving the first valve core.

3. The dual electronic expansion valve according to claim 2, characterized in that: A first thread and a second thread are formed within the first valve body; The first valve core is movably disposed in the first valve body via the first thread and the second thread.

4. The dual electronic expansion valve according to claim 2, characterized in that: The first driving member is a first motor, and a driving end of the first motor is connected to the first valve core.

5. The dual electronic expansion valve according to claim 1, characterized in that: The second electronic expansion valve includes a second valve body, a second valve core and a second driving member. The second valve body is configured with a second inlet and a second outlet connected to the second heat exchange unit. The second valve core is movably arranged in the second valve body. One end of the second valve core is arranged corresponding to the second inlet. The second driving member is transmission-connected to the second valve core and electrically connected to the controller so as to adjust the size of the second inlet according to the controller driving the second valve core.

6. The dual electronic expansion valve according to claim 5, characterized in that: A third thread and a fourth thread are formed within the second valve body; The second valve core is movably disposed in the second valve body via the third thread and the fourth thread.

7. The dual electronic expansion valve according to claim 5, characterized in that: The second driving member is a second motor, and a driving end of the second motor is connected to the second valve core.

8. The dual electronic expansion valve according to any one of claims 1 to 7, characterized in that: The first sensor and the second sensor are temperature sensors.

9. The dual electronic expansion valve according to any one of claims 1 to 7, characterized in that: The first sensor and the second sensor are pressure sensors.

10. An air conditioning system, characterized in that: include: A heat exchanger comprising a first heat exchange unit and a second heat exchange unit; and A dual electronic expansion valve as claimed in any one of claims 1 to 9.

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