Electronic expansion valve

Abstract

According to the electronic expansion valve, the nonmetal buffering piece is additionally arranged on the valve seat, the buffering piece is limited in the installation groove of the valve seat, at least part of the buffering piece protrudes out of the inner wall face of the valve seat, and the nonmetal buffering piece is in sliding fit with the metal valve element, so that the stability of the valve element in the actuation process can be relatively guaranteed; and the actuating noise between the valve core and the valve seat is reduced.

Description

[Technical field]

[0001] The present application relates to the field of refrigeration control technology, and in particular to an electronic expansion valve. [Background technology]

[0002] Electronic expansion valves are commonly used in refrigeration systems and include a valve body with a valve port and a valve needle. The valve needle can move close to or away from the valve port to adjust the refrigerant flow. During the valve opening process, the valve needle is in a suspended state. Due to changes in system pressure or refrigerant pulsation, the valve needle is prone to swing left and right, and the valve needle will collide with the valve body and valve wall to produce noise. [Contents of the utility model]

[0003] The utility model aims to provide an electronic expansion valve, which can relatively ensure the stability of the valve core during the actuation process and improve the actuation noise between the valve core and the valve seat.

[0004] The utility model provides an electronic expansion valve, including a valve seat and a valve stem assembly, the valve seat including a valve mouth portion provided with a valve mouth, the valve stem assembly including a valve stem and a valve core connected to the valve stem, the valve core can abut against or stay away from the valve mouth portion, the electronic expansion valve also includes a buffer member made of non-metallic material, the valve seat is provided with a mounting groove, the buffer member is limited in the mounting groove and at least a portion of the buffer member protrudes from the inner wall surface of the valve seat, and the valve core and the buffer member are slidably matched.

[0005] The utility model provides an electronic expansion valve, by adding a non-metallic buffer component to the valve seat, the buffer component is limited to the installation groove of the valve seat and at least partially protrudes from the inner wall surface of the valve seat, the non-metallic buffer component and the metal valve core are slidably matched, the stability of the valve core during the actuation process can be relatively guaranteed, and the actuation noise between the valve core and the valve seat can be improved.

Brief Description of the Drawings

[0006] Figure 1 A schematic cross-sectional view of the overall structure of the electronic expansion valve provided by the utility model;

[0007] Figure 2 for Figure 1 An enlarged schematic diagram of a valve stem assembly of an electronic expansion valve;

[0008] Figure 3 A schematic diagram of the three-dimensional structure of the buffer component of the electronic expansion valve provided by the utility model;

[0009] Figure 4 A schematic diagram of the three-dimensional structure of the valve core of the electronic expansion valve provided by the utility model; BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Valve seat 10, valve port 11, mounting groove 10a, inner wall surface 12, valve stem 20, valve core 30, outer surface 31, buffer 40, notch 41, outer peripheral portion 42, inner peripheral portion 43, first connecting pipe 100, second connecting pipe 200 [Specific implementation method]

[0012] In order to enable those skilled in the art to better understand the technical solution provided by the present application, the technical solution of the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the electronic expansion valve structure provided by the utility model mainly makes design improvements by adding a buffer part to the valve core structure, and other structures such as the valve mouth, valve stem, nut, etc. can be adaptively adjusted according to the system occasion.

[0013] Reference Figure 1 Combination Figure 2-4 As shown, the present application provides an electronic expansion valve, which is described by taking a typical deceleration type electronic expansion valve as an example, including a permanent magnet stepping motor, a gear reduction mechanism with a deceleration function, and a threaded substructure that converts the motor rotational motion into the vertical motion of the valve stem, and the valve body includes core components such as a valve seat 10, a valve stem assembly, and a bellows;

[0014] The valve seat 10 is provided with a first connection port and a second connection port. The electronic expansion valve further comprises a first connection port 100, i.e., a transverse connection port, and a second connection port 200, i.e., a vertical connection port. The first connection port 100 and the first connection port can be fixed by welding, and the second connection port 200 and the second connection port can be fixed by welding. The valve stem assembly comprises a valve stem 20 and a valve core 30 fixedly connected or position-limitedly connected to the valve stem 20. The valve seat 10 is further provided with a valve port portion 11 with a valve port. It should be noted that the valve seat 10 can be an integral structure, and the valve port portion 11 can be integrally formed and arranged on the valve seat 10, or the valve port portion 11 can also be a separate component that is processed and formed and then fixedly connected to the valve seat by welding or the like.

[0015] When the electronic expansion valve is working, the stepper motor is driven to rotate by a high pulse frequency current to drive the gear reducer, and the valve core 30 is axially lifted and lowered through the transmission of the threaded pair and the bellows to approach or move away from the valve port to adjust the flow of the refrigerant flowing through the valve port. The valve seat 10 is provided with a mounting groove 10a, and the mounting groove 10a is recessed inward from the inner wall surface 12 of the valve seat 10. The electronic expansion valve also includes a buffer 40 of non-metallic material. Specifically, the buffer 40 can be made of plastic material, specifically, for example, a modified PPS plastic material can be used. The buffer 40 is provided with a notch 41, including an outer peripheral portion 42 and an inner peripheral portion 43. The buffer 40 can be inserted into the installation groove 31 through elastic deformation and limited in the installation groove 31, the outer peripheral portion 42 at least partially abuts against the bottom wall of the installation groove 10a, the buffer member 40 as a whole can be annular and compatible with the structure of the installation groove 10a of the valve seat, the buffer member 40 as a whole can be rotated relative to the valve seat 10 and disassembled from the valve seat 10, the buffer member 40 at least partially protrudes outward from the inner wall surface 12 of the valve seat 10, the buffer member 40 and the valve core 30 are slidably matched, specifically, the inner peripheral portion 43 of the buffer member 40 is directly slidably matched with the outer surface 31 of the valve core 30, and a preset gap L is provided between the outer surface of the valve core 30 and the inner wall surface 12 of the valve seat;

[0016] When the electronic expansion valve is in the closed state, the valve core 30 is against the valve mouth 11, and the electronic expansion valve has a first chamber and a second chamber, wherein the first chamber is located on the lower side of the valve core 30, and the second chamber is located on the upper side of the valve core 30, and the first chamber and the second chamber are connected through the notch 41. The setting of the notch 41 balances the upper and lower chamber pressures in the closed state.

[0017] The utility model provides an electronic expansion valve, by adding a non-metallic buffer component to the valve seat, the buffer component is limited to the installation groove of the valve core and at least partially protrudes from the inner wall surface of the valve seat, the non-metallic buffer component and the metal valve core are slidably matched, the stability of the valve core during the actuation process can be relatively guaranteed, and the actuation noise between the valve core and the valve seat can be improved.

[0018] The buffer member can also be arranged in several ways. For example, taking two buffer members as an example, the valve seat 10 can also be provided with a first mounting groove and a second mounting groove, and the two mounting grooves are arranged at intervals. The inner wall surface of the valve seat 10 includes an upper inner wall surface, a middle inner wall surface and a lower inner wall surface, and the middle inner wall surface is located between the first mounting groove and the second mounting groove. The buffer member includes a first buffer member and a second buffer member. The first buffer member is limited to the first mounting groove and at least partially protrudes from the inner wall surface. The second buffer member is limited to the second mounting groove and at least partially protrudes from the inner wall surface. The first inner peripheral portion of the first buffer member slides with the outer surface of the valve core and the second inner peripheral portion of the second buffer member slides with the outer surface of the valve core. The technical effects of the present application can also be achieved and will not be described one by one here.

[0019] The utility model provides an electronic expansion valve, including a valve seat and a valve stem assembly, the valve seat including a valve mouth portion provided with a valve mouth, the valve stem assembly including a valve stem and a valve core connected to the valve stem, the valve core can abut against or be away from the valve mouth portion, the electronic expansion valve also includes a buffer member made of non-metallic material, the buffer member is provided with a notch, the valve seat is provided with an installation groove, the buffer member is limited in the installation groove and at least a portion of the buffer member protrudes from the inner wall surface of the valve seat, and the valve core and the buffer member are slidably matched.

[0020] The utility model provides an electronic expansion valve, by adding a non-metallic buffer component to the valve seat, the buffer component is limited to the installation groove of the valve core and at least partially protrudes from the inner wall surface of the valve seat, the non-metallic buffer component and the metal valve core are slidably matched, the stability of the valve core during the actuation process can be relatively guaranteed, and the actuation noise between the valve core and the valve seat can be improved.

[0021] It should be noted that the directional nouns such as up, down, left, and right mentioned in this article are all based on the drawings in the specification and are introduced for the convenience of description; and the ordinal numbers such as "first" and "second" in the component names are also introduced for the convenience of description, and do not mean any limitation on any order of the components. In addition, since the functions of some parts of the various components provided in the above embodiments are the same, this specification adopts a unified naming method for these parts. The electronic expansion valve provided by the relevant technical solution is introduced in detail above, and the specific embodiments are used in this article for elaboration. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model, and does not impose any form of limitation on the utility model.

Claims

1. An electronic expansion valve, characterized in that: It includes a valve seat and a valve stem assembly, the valve seat includes a valve mouth portion provided with a valve mouth, the valve stem assembly includes a valve stem and a valve core connected to the valve stem, the valve core can abut against or move away from the valve mouth portion, the electronic expansion valve also includes a buffer member made of non-metallic material, the valve seat is provided with a mounting groove, the buffer member is limited in the mounting groove and at least part of the buffer member protrudes from the inner wall surface of the valve seat, and the valve core and the buffer member are slidably matched.

2. The electronic expansion valve according to claim 1, characterized in that: The installation groove is recessed inward from the inner wall surface, and the buffer can be inserted into the installation groove through elastic deformation. The outer periphery of the buffer at least partially abuts against the bottom wall of the installation groove, and the inner periphery of the buffer slides with the outer surface of the valve core.

3. The electronic expansion valve according to claim 1, characterized in that: The inner circumference of the buffer member forms a guide portion to guide the valve core.

4. The electronic expansion valve according to claim 1, characterized in that: The mounting groove includes a first mounting groove and a second mounting groove, the first mounting groove and the second mounting groove are spaced apart from each other, the buffer member includes a first buffer member and a second buffer member, the first buffer member is limited to the first mounting groove and at least partially protrudes from the inner wall surface of the valve seat, and the second buffer member is limited to the second mounting groove and at least partially protrudes from the inner wall surface of the valve seat.

5. The electronic expansion valve according to claim 4, characterized in that: The first inner peripheral portion of the first buffer member is slidably matched with the outer surface of the valve core, and the second inner peripheral portion of the second buffer member is slidably matched with the outer surface of the valve core.

6. The electronic expansion valve according to any one of claims 1 to 4, characterized in that: The buffer piece is made of plastic.

7. The electronic expansion valve according to claim 6, characterized in that: The plastic material is modified PPS.

8. The electronic expansion valve according to any one of claims 1 to 4, characterized in that: The buffer is an annular structure, and the buffer can be rotated relative to the valve seat and removed from the valve seat.

9. The electronic expansion valve according to any one of claims 1 to 4, characterized in that: When the valve is in a closed state, the valve core is against the valve mouth, and the electronic expansion valve has a first chamber and a second chamber, the first chamber is located on the side below the valve core, and the second chamber is located on the side above the valve core, and the buffer is provided with a notch, and the first chamber and the second chamber are connected through the notch.

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