Electronic expansion valve facilitating pressure balance

Abstract

The utility model provides a kind of electronic expansion valve facilitating balance air pressure, comprising: valve body;Valve seat, the valve seat is installed in the top of the valve body;Driving assembly, the driving assembly is set in the top of the valve seat;Sleeve, the sleeve is installed in the top of the valve seat.The utility model provides a kind of electronic expansion valve facilitating balance air pressure, by valve body, valve seat, driving assembly, sleeve, buffer assembly and valve needle mutually cooperate, when closing valve port, screw rod of driving assembly drives moving plate to descend, after valve needle abuts valve port, moving plate continues to descend due to inertia, fixed tube is slid and compresses second spring relative to moving tube, the elastic deformation of second spring absorbs impact energy, prevent valve needle and valve port direct rigid contact, avoid the problem that valve needle abrasion, valve port deformation when electronic expansion valve is closed due to rigid impact, and further cause sealing failure, refrigerant leakage, increase the reliability of entire refrigeration system operation.

Description

Technical Field

[0001] This utility model relates to the field of electronic expansion valve technology, and in particular to an electronic expansion valve that facilitates pressure balancing. Background Technology

[0002] As a core throttling element in refrigeration, air conditioning, heat pump systems, and cold chain equipment, the electronic expansion valve's core function is to regulate the refrigerant flow and pressure by precisely controlling the gap between the valve needle and the valve port, thereby achieving dynamic matching between the system's cooling capacity and load. During system operation, the refrigerant will experience drastic pressure changes when flowing through the valve port. If the pressure at both ends of the valve needle is unbalanced, it can easily lead to valve needle vibration, increased noise, and even affect the accuracy of flow control. Therefore, pressure balance and precise throttling are the core requirements for the design of electronic expansion valves.

[0003] For example, the prior art patent application with publication number CN 217815260 U includes a valve body and a valve seat disposed on the valve body. The valve seat has a valve port, and a valve needle is coaxially slidably connected to the valve port. A sleeve is fitted onto the valve seat, and a drive rod connected to the valve needle for driving the valve needle is disposed within the sleeve. A drive device for driving the drive rod is also provided on the sleeve. A threaded hole is provided at the end of the valve needle connected to the drive rod. A threaded section is provided on the drive rod, and the threaded section has an external thread that matches the threaded hole. The threaded section is inserted into the threaded hole and threadedly connected to the valve needle. A through hole communicating with the threaded hole is provided inside the valve needle, and the through hole is coaxially arranged with the threaded hole. The through hole passes through the end of the valve needle opposite to the drive rod and communicates with the outside. A flow channel for communicating with the outside is provided inside the drive rod and the valve needle, and the flow channel communicates with the through hole. This utility model has the advantage of facilitating the balancing of air pressure at both ends of the valve needle.

[0004] However, in practical applications, when the drive component moves the valve needle downward to close the valve port, due to the inertia of the screw drive and the system pressure impact, the valve needle will continue to move downward after it is pressed against the valve port, causing a rigid impact between the valve needle and the valve port. This impact will cause wear on the tip of the valve needle and deformation of the valve port. Long-term use will lead to a decrease in sealing performance, refrigerant leakage, and affect the operational reliability of the entire refrigeration system.

[0005] Therefore, it is necessary to provide an electronic expansion valve that facilitates pressure balancing to solve the above-mentioned technical problems. Utility Model Content

[0006] This invention provides an electronic expansion valve that facilitates pressure balancing, solving the problem that existing electronic expansion valves are prone to rigid impact between the valve needle and the valve port when closed, leading to component wear and sealing failure.

[0007] To solve the above-mentioned technical problems, this utility model provides an electronic expansion valve that facilitates pressure balancing, comprising: Valve body; A valve seat, which is mounted on the top of the valve body; A drive assembly, the drive assembly being disposed on top of the valve seat; A sleeve, which is installed on top of the valve seat; A buffer assembly is disposed on the inner side of the valve body. The buffer assembly includes a movable plate, a threaded ring is fixedly installed inside the movable plate, a fixed tube is fixedly installed at the bottom of the movable plate, a movable tube is slidably connected inside the bottom of the fixed tube, and a second spring is disposed inside the movable tube and at the top of the movable tube. A valve needle is located at the bottom of the moving tube.

[0008] Preferably, the valve body has an internal cavity, and a valve port is fixedly installed on the inner side of the cavity. The valve port is located at the bottom of the valve needle. Air passages are provided on both sides of the valve body, and the two air passages are respectively located at the top and bottom of the valve port.

[0009] Preferably, the valve seat has a movable groove inside, and the bottom of the movable groove has a sliding groove.

[0010] Preferably, the drive assembly includes a stator coil, a rotating shaft, and a rotor assembly. The stator coil is fixedly installed on the outer side of the sleeve, the rotor assembly is disposed on the inner side of the sleeve, the rotating shaft is fixedly installed on the inner side of the rotor assembly, and a screw is fixedly installed at the bottom of the rotating shaft, the screw being threadedly connected to the inner side of the threaded ring.

[0011] Preferably, a first spring is provided on the top of the movable plate, the movable plate is slidably connected to the inner side of the movable groove, and the fixed tube is slidably connected to the inner side of the groove.

[0012] Preferably, the top of the valve needle is provided with a mounting assembly.

[0013] Preferably, the mounting assembly includes a limiting ring, which is fixedly mounted on the top of the valve needle. The limiting ring is also slidably connected to the outer side of the moving tube. A threaded hole is provided on the side of the limiting ring, and a locking screw is threadedly connected to the inner side of the threaded hole. One end of the locking screw abuts against the side of the moving tube.

[0014] Compared with related technologies, the electronic expansion valve provided by this utility model, which facilitates pressure balancing, has the following advantages: This invention provides an electronic expansion valve that facilitates pressure balancing. The valve body, valve seat, drive assembly, sleeve, buffer assembly, and valve needle work together. When the valve is closed, the screw of the drive assembly moves the moving plate downwards. After the valve needle contacts the valve port, the moving plate continues to move downwards due to inertia. The fixed tube slides relative to the moving tube and compresses the second spring. The elastic deformation of the second spring absorbs the impact energy, preventing direct rigid contact between the valve needle and the valve port. This avoids valve needle wear and valve port deformation caused by rigid impact when the electronic expansion valve is closed, which could lead to sealing failure and refrigerant leakage, thus increasing the reliability of the entire refrigeration system. Attached Figure Description

[0015] Figure 1 A schematic diagram of the structure of a first embodiment of an electronic expansion valve for facilitating air pressure balance provided by this utility model; Figure 2 for Figure 1 The diagram shows a cross-sectional structure. Figure 3 for Figure 2 The enlarged schematic diagram of part A shown below; Figure 4 This is a schematic diagram of the second embodiment of an electronic expansion valve that facilitates air pressure balancing provided by this utility model.

[0016] The following are the labels in the diagram: 1. Valve body, 11. Cavity, 12. Valve port, 13. Air passage, 2. Valve seat, 21. Moving groove, 22. Slide groove, 3. Drive assembly, 31. Stator coil, 32. Rotating shaft, 33. Rotor assembly, 4. Sleeve, 5. Screw, 6. First spring, 7. Buffer assembly, 71. Moving plate, 72. Threaded ring, 73. Fixed tube, 74. Moving tube, 75. Second spring, 8. Valve needle, 9. Mounting assembly, 91. Limiting ring, 92. Threaded hole, 93. Locking screw. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] First Embodiment Please refer to the following: Figure 1 , Figure 2 , Figure 3 ,in, Figure 1 A schematic diagram of the structure of a first embodiment of an electronic expansion valve for facilitating air pressure balance provided by this utility model; Figure 2 for Figure 1 The diagram shows a cross-sectional structure. Figure 3 for Figure 2 The enlarged schematic diagram of part A is shown.

[0019] An electronic expansion valve for facilitating pressure balancing includes: a valve body 1; Valve seat 2, which is mounted on the top of the valve body 1; A drive assembly 3 is disposed on the top of the valve seat 2; Sleeve 4, which is installed on the top of valve seat 2; A buffer assembly 7 is disposed on the inner side of the valve body 2. The buffer assembly 7 includes a movable plate 71. A threaded ring 72 is fixedly installed inside the movable plate 71. A fixed tube 73 is fixedly installed at the bottom of the movable plate 71. A movable tube 74 is slidably connected inside the bottom of the fixed tube 73. A second spring 75 is disposed inside the movable tube 74. The second spring 75 is disposed at the top of the movable tube 74. Valve needle 8 is disposed at the bottom of the moving tube 74.

[0020] The valve needle 8 and the valve port 12 are compatible. When in use, the valve needle 8 is inserted into the inner side of the valve port 12 to block the flow of substances.

[0021] The valve body 1 has a cavity 11 inside, and a valve port 12 is fixedly installed on the inner side of the cavity 11. The valve port 12 is located at the bottom of the valve needle 8. Air passages 13 are provided on both sides of the valve body 1, and the two air passages 13 are respectively located at the top and bottom of the valve port 12.

[0022] The valve seat 2 has a movable groove 21 inside, and a sliding groove 22 is provided at the bottom of the movable groove 21.

[0023] The drive assembly 3 includes a stator coil 31, a rotating shaft 32, and a rotor assembly 33. The stator coil 31 is fixedly installed on the outer side of the sleeve 4, the rotor assembly 33 is disposed on the inner side of the sleeve 4, the rotating shaft 32 is fixedly installed on the inner side of the rotor assembly 33, and a screw 5 is fixedly installed at the bottom of the rotating shaft 32. The screw 5 is threadedly connected to the inner side of the threaded ring 72.

[0024] The top of the movable plate 71 is provided with a first spring 6, the movable plate 71 is slidably connected to the inner side of the movable groove 21, and the fixed tube 73 is slidably connected to the inner side of the sliding groove 22.

[0025] When the valve needle 8 moves away from the valve port 12, the moving plate 71 moves upward and compresses the first spring 6. As a result, when the valve needle 8 moves downward, the elasticity of the first spring 6 is released, thereby pushing the moving plate 71 downward and assisting the valve needle 8 to move downward. The movable plate 71 is square, and the movable groove 21 is adapted to the movable plate 71. In this way, when in use, it can limit the movable plate 71 and prevent the movable plate 71 from rotating.

[0026] The working principle of the electronic expansion valve that facilitates air pressure balance provided by this utility model is as follows: When the refrigeration system is running, the refrigerant enters the cavity 11 (top of the valve port 12) through the gas passage 13 on one side of the valve body 1. After the refrigerant is throttled and depressurized through the gap between the valve needle 8 and the valve port 12, it flows out from the gas passage 13 on the other side. At the same time, the top and bottom of the valve port 12 are kept in air pressure communication through the gas passage 13 to avoid the formation of an excessive pressure difference between the upper and lower ends of the valve needle 8, prevent the valve needle 8 from vibrating, and ensure stable flow control. When the system needs to reduce its cooling capacity, the stator coil 31 is energized to generate a magnetic field, which drives the rotor assembly 33 to rotate the shaft 32 and the screw 5 clockwise. The screw 5 is threadedly engaged with the threaded ring 72 of the moving plate 71, causing the moving plate to slide downward along the moving groove 21. The fixed tube 73 moves downward along the sliding groove 22 at the same time, pushing the valve needle 8 closer to the valve port 12 through the moving tube 74, reducing the gap between the valve needle 8 and the valve port 12, and reducing the refrigerant flow. Conversely, when the screw 5 rotates counterclockwise, the valve needle 8 moves away from the valve port 12, increasing the flow. When the system stops or valve port 12 needs to be closed, screw 5 drives moving plate 71 to move down quickly, and valve needle 8 gradually approaches valve port 12; when the top of valve needle 8 abuts against valve port 12, moving plate 71 continues to move down due to inertia, fixed tube 73 slides down relative to moving tube 74, compressing the second spring 75 in moving tube 74. The second spring 75 absorbs the impact energy and avoids rigid collision between valve needle 8 and valve port 12.

[0027] Compared with related technologies, the electronic expansion valve provided by this utility model, which facilitates pressure balancing, has the following advantages: The valve body 1, valve seat 2, drive assembly 3, sleeve 4, buffer assembly 7, and valve needle 8 work together. When the valve port 12 is closed, the screw 5 of the drive assembly 3 drives the moving plate 71 to move downward. After the valve needle 8 abuts against the valve port 12, the moving plate 71 continues to move downward due to inertia. The fixed tube 73 slides relative to the moving tube 74 and compresses the second spring 75. The elastic deformation of the second spring 75 absorbs the impact energy and prevents the valve needle 8 from directly and rigidly contacting the valve port 12. This avoids the problem of valve needle 8 wear and valve port deformation caused by rigid impact when the electronic expansion valve is closed, which could lead to sealing failure and refrigerant leakage. This increases the reliability of the entire refrigeration system.

[0028] Second Embodiment Please refer to the following: Figure 4Based on the electronic expansion valve for facilitating pressure balancing provided in the first embodiment of this application, the second embodiment of this application proposes another electronic expansion valve for facilitating pressure balancing. The second embodiment is merely a preferred embodiment of the first embodiment, and its implementation will not affect the separate implementation of the first embodiment.

[0029] Specifically, the second embodiment of this application provides an electronic expansion valve that facilitates air pressure balance, wherein the valve needle 8 is provided with a mounting component 9 at its top.

[0030] The mounting assembly 9 includes a limiting ring 91, which is fixedly mounted on the top of the valve needle 8. The limiting ring 91 is also slidably connected to the outer side of the moving tube 74. A threaded hole 92 is provided on the side of the limiting ring 91, and a locking screw 93 is threadedly connected to the inner side of the threaded hole 92. One end of the locking screw 93 abuts against the side of the moving tube 74.

[0031] The working principle of the electronic expansion valve that facilitates air pressure balance provided by this utility model is as follows: When the valve needle 8 wears out due to long-term use and needs to be replaced, simply loosen the locking screw 93 on the side of the limit ring 91 so that one end of the screw is disengaged from the outer side of the moving tube 74, and the limit ring 91 and the valve needle can be pulled out from the bottom of the moving tube 74. After replacing the valve needle 8, put the limit ring 91 onto the outer side of the moving tube 74, tighten the locking screw 93 to press against the moving tube 74, and complete the fixing of the valve needle 8.

[0032] Compared with related technologies, the electronic expansion valve provided by this utility model, which facilitates pressure balancing, has the following advantages: By installing component 9, the limit ring 91 and locking screw 93 can be used to quickly install and remove the valve needle 8 without the need for professional tools, thus lowering the maintenance threshold and enhancing the practicality and ease of operation and maintenance of the device.

[0033] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An electronic expansion valve for facilitating pressure balancing, characterized in that, include: Valve body; A valve seat, which is mounted on the top of the valve body; A drive assembly, wherein the drive assembly is disposed on top of the valve seat; A sleeve, which is installed on top of the valve seat; A buffer assembly is disposed on the inner side of the valve body. The buffer assembly includes a movable plate, a threaded ring is fixedly installed inside the movable plate, a fixed tube is fixedly installed at the bottom of the movable plate, a movable tube is slidably connected inside the bottom of the fixed tube, and a second spring is disposed inside the movable tube and at the top of the movable tube. A valve needle is located at the bottom of the moving tube.

2. The electronic expansion valve for facilitating pressure balance according to claim 1, characterized in that, The valve body has an internal cavity, and a valve port is fixedly installed on the inner side of the cavity. The valve port is located at the bottom of the valve needle. Air passages are provided on both sides of the valve body, and the two air passages are respectively located at the top and bottom of the valve port.

3. The electronic expansion valve for facilitating pressure balance according to claim 2, characterized in that, The valve seat has a movable groove inside, and a sliding groove is formed at the bottom of the movable groove.

4. The electronic expansion valve for facilitating pressure balance according to claim 3, characterized in that, The drive assembly includes a stator coil, a rotating shaft, and a rotor assembly. The stator coil is fixedly installed on the outer side of the sleeve, the rotor assembly is disposed on the inner side of the sleeve, the rotating shaft is fixedly installed on the inner side of the rotor assembly, and a screw is fixedly installed at the bottom of the rotating shaft, the screw being threadedly connected to the inner side of the threaded ring.

5. An electronic expansion valve for facilitating pressure balancing according to claim 4, characterized in that, The top of the movable plate is provided with a first spring, the movable plate is slidably connected to the inner side of the movable groove, and the fixed tube is slidably connected to the inner side of the groove.

6. The electronic expansion valve for facilitating pressure balance according to claim 1, characterized in that, The valve needle is provided with a mounting assembly at its top.

7. An electronic expansion valve for facilitating pressure balance according to claim 6, characterized in that, The mounting assembly includes a limiting ring, which is fixedly mounted on the top of the valve needle. The limiting ring is also slidably connected to the outer side of the moving tube. A threaded hole is provided on the side of the limiting ring, and a locking screw is threadedly connected to the inner side of the threaded hole. One end of the locking screw abuts against the side of the moving tube.

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