Electronic expansion valve with PT sensor

Abstract

The utility model discloses a kind of electronic expansion valves with PT sensor, including coil assembly, valve body, PCBA circuit board assembly and PT sensor;Coil assembly is detachably fixed in valve body, PCBA circuit board assembly is set inside coil assembly, valve body is perforated with through liquid hole, the both ends of through liquid hole are formed liquid inlet end and liquid outlet end respectively, assembly cavity that is communicated with through liquid hole is equipped in valve body interior, coil assembly is opened with the connecting hole coaxial and communicated with assembly cavity, PT sensor is inserted and assembled in assembly cavity rotationally and sealingly, the electricity connection end of this PT sensor is extended into coil assembly interior by connecting hole and is fixed by lock nut, the detection end of this PT sensor is inserted into through liquid hole, PCBA circuit board assembly is electrically connected with the electricity connection end of PT sensor.The utility model discloses electronic expansion valve, PT sensor is integrated in electronic expansion valve, simplify the overall structure of cooling system, reduce assembly difficulty, and improve control reliability.

Description

Technical Field

[0001] This utility model relates to the field of automotive air conditioning cooling system technology, specifically to an electronic expansion valve with a PT sensor. Background Technology

[0002] Automotive air conditioning cooling systems include compressors, evaporators, condensers, and throttling elements. The throttling element, used to control refrigerant flow, is a key component affecting system energy efficiency and temperature stability. To improve the accuracy of refrigerant flow control, current technology uses electronic expansion valves as throttling elements. Flow control by electronic expansion valves typically relies on external parameter acquisition and algorithm calculation. Specifically, pressure and temperature sensors need to be additionally installed on the cooling system piping to collect pressure and temperature parameters at the evaporator inlet and outlet, respectively. The controller receives these sensor signals, calculates the superheat based on a preset control program, and adjusts the opening of the electronic expansion valve accordingly to ultimately achieve flow control.

[0003] However, the above solution has significant shortcomings:

[0004] 1. Pressure sensors, temperature sensors and electronic expansion valves need to be connected to the cooling system through independent pipelines, which leads to a complex system pipeline layout and an increased number of parts. This not only increases the assembly process but also occupies more installation space, which is not conducive to the lightweight and compact design of automotive air conditioning systems.

[0005] 2. The dispersed arrangement of sensors and electronic expansion valves increases the signal transmission path, which may introduce signal interference or delay, affecting the control response speed and accuracy.

[0006] 3. The increased number of pipe connection points also increases the risk of leakage and reduces the reliability of system operation. Utility Model Content

[0007] In view of this, the present invention proposes an electronic expansion valve with a PT sensor, which integrates the PT sensor into the electronic expansion valve to simplify the overall structure of the cooling system, reduce assembly difficulty, and improve control reliability.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] An electronic expansion valve with a PT sensor includes a coil assembly, a valve body, and a PCBA circuit board assembly. The coil assembly is detachably fixed to the valve body, and the PCBA circuit board assembly is disposed inside the coil assembly. It also includes a PT sensor. The valve body has a through-hole with an inlet and an outlet at its two ends. The valve body has an assembly cavity communicating with the through-hole. The coil assembly has a connecting hole coaxial with and communicating with the assembly cavity. The PT sensor is non-rotating and sealed within the assembly cavity. The PT sensor's electrical terminal extends into the coil assembly through the connecting hole and is fixed by a lock nut. The PT sensor's detection terminal extends into the through-hole. The PCBA circuit board assembly is electrically connected to the PT sensor's electrical terminal.

[0010] To better achieve the above technical solution, optionally, the outer peripheral wall of the PT sensor is provided with a first limiting part, and the inner peripheral wall of the assembly cavity is provided with a second limiting part that cooperates with the first limiting part to prevent rotation in the circumferential direction.

[0011] Optionally, there are two first limiting parts and two second limiting parts. The two first limiting parts are arranged at intervals on the circumferential direction of the outer peripheral wall of the PT sensor, and the two second limiting parts are arranged at intervals on the circumferential direction of the inner peripheral wall of the assembly cavity.

[0012] Optionally, the upper outer peripheral wall of the PT sensor is provided with a first annular groove, and the first annular groove is fitted with a first sealing ring that seals with the inner peripheral wall of the locking nut.

[0013] Optionally, the lower outer peripheral wall of the PT sensor is provided with a second annular groove, and the second annular groove is fitted with a second sealing ring that seals with the inner peripheral wall of the assembly cavity.

[0014] Optionally, the upper end face of the valve body is provided with a third annular groove around the upper port of the assembly cavity, and the third annular groove is fitted with a third sealing ring that seals with the outer wall of the coil assembly.

[0015] Optionally, the coil assembly is an L-shaped structure, the valve body is a columnar structure, the PT sensor is located inside the coil assembly and the valve body on the same side, the other side of the coil assembly is provided with an assembly hole, the other side of the valve body is inserted into the assembly hole, and is detachably and fixedly connected to the coil assembly through a connector.

[0016] Optionally, one end of the connector is welded to the coil assembly, and the other end has a connection hole. The valve body has a through hole at the corresponding position. The connector is detachably and fixedly connected to the valve body by screws passing through the connection hole and the through hole.

[0017] The beneficial effects of this utility model are:

[0018] This invention relates to an electronic expansion valve with a PT sensor. By integrating the PT sensor into the internal space of the coil assembly and the valve body, and utilizing the liquid passage hole on the valve body, the PT sensor's detection end can collect the refrigerant temperature signal flowing through the liquid passage hole in real time and transmit the temperature signal to the PCBA circuit board assembly. The PCBA circuit board assembly controls the electric valve inside the valve body to adjust the opening degree of the high-pressure side of the refrigerant based on the acquired temperature data, thereby achieving precise control of the refrigerant flow. Integrating the PT sensor into the electronic expansion valve simplifies the overall structure of the cooling system, reduces assembly difficulty, and improves control reliability. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of an electronic expansion valve with a PT sensor according to an embodiment of the present invention;

[0020] Figure 2 yes Figure 1 A sectional view;

[0021] Figure 3 yes Figure 1 First-angle exploded view;

[0022] Figure 4 yes Figure 1 Second angle of the exploded view

[0023] Figure 5 yes Figure 1 A three-dimensional schematic diagram of the middle section structure;

[0024] Figure 6 yes Figure 2 A three-dimensional schematic diagram of the valve body and the PT sensor;

[0025] Figure label:

[0026] Coil assembly 10, connecting hole 101, connector 11, ring connector 111, connecting plate 112, screw 113;

[0027] Valve body 20, liquid passage 201, assembly cavity 202, second limiting part 203;

[0028] 30 PCBA circuit board assembly, 31 FPC flexible flexible board;

[0029] PT sensor 40, first limiting part 401, first sealing ring 41, second sealing ring 42, third sealing ring 43;

[0030] Locking nut 50. Detailed Implementation

[0031] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. Identical components are indicated by the same reference numerals.

[0032] Please see Figures 1 to 6 This utility model discloses an electronic expansion valve with a PT sensor, including a coil assembly 10, a valve body 20, a PCBA circuit board assembly 30, and a PT sensor 40. The coil assembly 10 is detachably fixed to the valve body 20, and the circuit board assembly 30 is disposed inside the coil assembly 10. It should be noted that the coil assembly 10 and the valve body 20 are both prior art, and their specific structures will not be described in detail.

[0033] like Figures 1 to 3 as well as Figure 5 As shown, the valve body 20 has a through-hole 201, with an inlet and an outlet at both ends. The valve body 20 has an assembly cavity 202 that communicates with the through-hole 201. Specifically, the assembly cavity 202 is perpendicular to the through-hole 201. The coil assembly 10 has a connecting hole 101 that is coaxial with and communicates with the assembly cavity 202. The PT sensor 40 is inserted into the assembly cavity 202 in a non-rotating and sealed manner. The power terminal of the PT sensor 40 extends into the coil assembly 10 through the connecting hole 101 and is fixed by a locking nut 50. The detection terminal of the PT sensor 40 extends into the through-hole 201. The PCBA circuit board assembly 30 is electrically connected to the power terminal of the PT sensor 40. Specifically, the PCBA circuit board assembly 30 and the main board of the PT sensor 40 are connected through an FPC flexible board to achieve a flexible conductive connection.

[0034] This embodiment of the invention relates to an electronic expansion valve with a PT sensor. The PT sensor 40 is integrated into the coil assembly 10 and the valve body 20. Utilizing a liquid passage 201 on the valve body 20, the PT sensor 40's detection end can collect the refrigerant temperature signal flowing through the passage 201 in real time and transmit the temperature signal to the PCBA circuit board assembly 30. The PCBA circuit board assembly 30 controls the electric valve within the valve body 20 to adjust the opening degree of the high-pressure side of the refrigerant based on the acquired temperature data, thereby achieving precise control of the refrigerant flow. Integrating the PT sensor 40 into the electronic expansion valve simplifies the overall structure of the cooling system, reduces assembly difficulty, and improves control reliability.

[0035] like Figure 6As shown, in this embodiment of the present invention, the outer peripheral wall of the PT sensor 40 is provided with a first limiting part 401, and the inner peripheral wall of the assembly cavity 202 is provided with a second limiting part 203 that cooperates with the first limiting part 401 in a circumferential anti-rotation manner. Preferably, there are two first limiting parts 401 and two limiting parts 203, with the two first limiting parts 401 being spaced apart in the circumferential direction on the side wall of the PT sensor 40, and the two second limiting parts 203 being spaced apart in the circumferential direction on the inner wall of the assembly cavity 202.

[0036] Specifically, the shape of the assembly cavity 202 is adapted to the shape of the PT sensor 40. The part of the PT sensor 40 located in the assembly cavity 202 is a cylindrical structure. The first limiting part 401 and the second limiting part 203 are both two planes. By using the two planes to fit together, the PT sensor 40 can be inserted into the assembly cavity without rotation, thereby ensuring that the three pins of the PT sensor 40 are uniquely fixed after assembly, avoiding pin misalignment due to rotation and affecting the reliability of electrical connection.

[0037] like Figure 2 As shown in this embodiment of the present invention, the upper outer peripheral wall of the PT sensor 40 is provided with a first annular groove, and the first annular groove is fitted with a first sealing ring 41 that seals with the inner peripheral wall of the locking nut 50. The PT sensor 40 and the coil assembly 10 can be connected as one unit by the boss on the upper part of the PT sensor 40 and the locking nut 50. The first sealing ring 41 can improve the sealing performance of the connection between the PT sensor 40 and the locking nut 50.

[0038] In this embodiment of the present invention, the lower outer peripheral wall of the PT sensor 40 is provided with a second annular groove, and a second sealing ring 42 is embedded in the second annular groove to seal with the inner peripheral wall of the assembly cavity 202. The second sealing ring 42 can prevent the refrigerant in the liquid passage hole 201 from leaking upward through the assembly gap between the PT sensor 40 and the assembly cavity 202.

[0039] In this embodiment of the present invention, the upper end face of the valve body 20 is provided with a third annular groove around the upper port of the assembly cavity. A third sealing ring 43 is embedded in the third annular groove and seals with the outer wall of the coil assembly 10. The third sealing ring 43 can increase the sealing performance of the contact surface between the valve body 20 and the coil assembly 10, and prevent refrigerant from leaking from the gap between the valve body 20 and the coil assembly 10, thereby improving the sealing reliability of the entire electronic expansion valve.

[0040] In this embodiment of the utility model, the coil assembly 10 is an L-shaped structure, the valve body 20 is a columnar structure, the PT sensor 40 is located inside the coil assembly 10 and the valve body 20 on the same side, the other side of the coil assembly 10 is provided with an assembly hole, the other side of the valve body 20 is inserted into the assembly hole, and is detachably and fixedly connected to the coil assembly 10 through the connector 11.

[0041] like Figure 3 and Figure 4 As shown, one end of the connector 11 is welded to the coil assembly 10, and the other end of the connector 11 is detachably fixed to the valve body 20 by screws 113. Specifically, the connector 11 includes an annular connection 111 and a connecting plate 112 integrally provided on the edge of the annular connection 111. The annular connection 111 is welded to the coil assembly 10, and the connecting plate 112 is provided with a connection hole. The valve body 20 is provided with a through hole at the corresponding position. The connector 11 is detachably fixed to the valve body 20 by screws 113 passing through the connection hole and the through hole.

[0042] The electronic expansion valve with PT sensor in this embodiment achieves compact assembly of the coil assembly 10 and the linear valve body 20 through the nested cooperation of the coil assembly 10 and the linear valve body 20, combined with the detachable fixing of the connector 11, and facilitates quick disassembly and assembly during later maintenance.

[0043] The technical solution of this utility model has been described in detail above with reference to specific embodiments. The specific embodiments described are used to help understand the concept of this utility model. Derivations and modifications made by those skilled in the art based on the specific embodiments of this utility model also fall within the protection scope of this utility model.

Claims

1. An electronic expansion valve with a PT sensor, comprising a coil assembly (10), a valve body (20), and a PCBA circuit board assembly (30), wherein the coil assembly (10) is detachably fixed to the valve body (20), and the PCBA circuit board assembly (30) is disposed inside the coil assembly (10); characterized in that, It also includes a PT sensor (40); The valve body (20) has a through-hole (201) with an inlet and an outlet at its two ends. The valve body (20) has an assembly cavity (202) that communicates with the through-hole (201). The coil assembly (10) has a connecting hole (101) that is coaxial with and communicates with the assembly cavity (202). The PT sensor (40) is inserted into the assembly cavity (202) in a non-rotating and sealed manner. The power terminal of the PT sensor (40) extends into the coil assembly (10) through the connecting hole (101) and is fixed by a locking nut (50). The detection terminal of the PT sensor (40) extends into the through-hole (201). The PCBA circuit board assembly (30) is electrically connected to the power terminal of the PT sensor (40).

2. The electronic expansion valve with a PT sensor according to claim 1, characterized in that, The outer peripheral wall of the PT sensor (40) is provided with a first limiting part (401), and the inner peripheral wall of the assembly cavity (202) is provided with a second limiting part (203) that cooperates with the first limiting part (401) to prevent rotation in the circumferential direction.

3. An electronic expansion valve with a PT sensor according to claim 2, characterized in that, There are two first limiting parts (401) and two second limiting parts (203). The two first limiting parts (401) are arranged at intervals on the outer peripheral wall of the PT sensor (40), and the two second limiting parts (203) are arranged at intervals on the inner peripheral wall of the assembly cavity (202).

4. An electronic expansion valve with a PT sensor according to claim 1, characterized in that, The upper outer peripheral wall of the PT sensor (40) is provided with a first annular groove, and the first annular groove is fitted with a first sealing ring (41) that seals with the inner peripheral wall of the locking nut (50).

5. An electronic expansion valve with a PT sensor according to claim 4, characterized in that, The lower outer peripheral wall of the PT sensor (40) is provided with a second annular groove, and the second annular groove is fitted with a second sealing ring (42) that seals with the inner peripheral wall of the assembly cavity (202).

6. An electronic expansion valve with a PT sensor according to claim 5, characterized in that, The upper end face of the valve body (20) is provided with a third annular groove around the upper port of the assembly cavity (202), and the third annular groove is fitted with a third sealing ring (43) that seals with the outer wall of the coil assembly (10).

7. An electronic expansion valve with a PT sensor according to claim 1, characterized in that, The coil assembly (10) is an L-shaped structure, the valve body (20) is a columnar structure, the PT sensor (40) is located inside the coil assembly (10) and the valve body (20) on the same side, the other side of the coil assembly (10) is provided with an assembly hole, the other side of the valve body (20) is inserted into the assembly hole, and is detachably and fixedly connected to the coil assembly (10) through a connector (11).

8. An electronic expansion valve with a PT sensor according to claim 7, characterized in that, One end of the connector (11) is welded to the coil assembly (10), and the other end has a connection hole. The valve body (20) has a through hole at the corresponding position. The connector (11) is detachably and fixedly connected to the valve body (20) by a screw (113) passing through the connection hole and the through hole.

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