Electronic expansion valve

Abstract

The utility model provides an electronic expansion valve, by adding a coating part between the valve core and the valve seat, adding a coating part on the valve core or the valve seat, the valve core and the valve seat are slidably matched through the coating part, and the radial dimension of the valve core is relatively thickened through the cooperation between the non-metallic coating part and the metal parts, which can relatively guarantee the stability of the valve core during actuation and improve the actuation noise between the valve core and the valve seat; or by providing a coating part on the outer peripheral surface of the valve core and the inner wall surface of the valve seat, the coating part of the valve core and the coating part of the valve seat are slidably matched, which can relatively guarantee the stability of the valve core during actuation and improve the actuation noise between the valve core and the valve seat.

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, comprising a valve seat and a valve stem assembly, wherein the valve seat comprises a valve mouth portion provided with a valve mouth, the valve stem assembly comprises 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 valve core is provided with a coating portion, the valve seat is provided with an inner wall surface, the coating portion is slidably matched with the inner wall surface; or the valve seat is provided with a coating portion, and the outer surface of the valve core is slidably matched with the coating portion.

[0005] The utility model provides an electronic expansion valve, wherein a coating portion is added to a valve core or a valve seat, and the valve core and the valve seat are slidably matched through the coating portion. Through the cooperation between the non-metallic coating portion and the metal parts, the radial dimension of the valve core is relatively thickened, which can relatively ensure the stability of the valve core during actuation and improve the actuation noise between the valve core and the valve seat.

[0006] The present application also provides an electronic expansion valve, comprising a valve seat and a valve stem assembly, wherein the valve seat comprises a valve mouth portion provided with a valve mouth, the valve stem assembly comprises 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 valve core is provided with a valve core coating portion, and the valve seat is provided with a valve seat coating portion, and the valve core coating portion is slidably matched with the valve seat coating portion.

[0007] By providing a coating portion on the outer peripheral surface of the valve core and the inner wall surface of the valve seat, the valve core coating portion and the valve seat coating portion are slidably matched, which can relatively ensure the stability of the valve core during actuation and improve the actuation noise between the valve core and the valve seat.

[0008] The present application also provides an electronic expansion valve, including a coil component, a reduction gear mechanism, a threaded fitting sub-mechanism, a bellows component, a valve stem assembly and a valve seat, 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 which is limitedly connected or fixedly connected to the valve stem, the valve stem is at least partially located in the bellows component and connected to the bellows, through the threaded fitting action of the threaded fitting sub-mechanism and the elastic transmission action of the bellows component, the valve core can abut against or move away from the valve mouth portion, the valve core is slidably fitted with the valve seat, and a coating portion is provided between the valve core and the valve seat.

[0009] By adding a coating portion between the valve core and the valve seat, or by adding a coating portion on the valve core or the valve seat, the valve core and the valve seat are slidably fitted through the coating portion, and the radial dimension of the valve core is relatively thickened through the fit between the non-metallic coating portion and the metal parts, which can relatively guarantee the stability of the valve core during actuation and improve the actuation noise between the valve core and the valve seat; or by providing a coating portion on the outer peripheral surface of the valve core and the inner wall surface of the valve seat, so that the coating portion of the valve core and the coating portion of the valve seat are slidably fitted, which can relatively guarantee the stability of the valve core during actuation and improve the actuation noise between the valve core and the valve seat.

Brief Description of the Drawings

[0010] Figure 1 A schematic cross-sectional view of the overall structure of the electronic expansion valve provided by the utility model;

[0011] Figure 2 for Figure 1 An enlarged schematic diagram of a valve stem assembly of an electronic expansion valve;

[0012] Reference numerals

[0013] Valve seat 10, valve port 11, inner wall surface 12, valve stem 20, valve core 30, coating portion 31, first connecting pipe 100, second connecting pipe 200 [Specific implementation method]

[0014] 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.

[0015] Reference Figure 1 Combination Figure 2As 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 for converting the motor rotational motion into the vertical motion of the valve stem. The valve body includes a valve seat 10, a valve stem assembly, a bellows and other core components. The valve stem assembly includes a valve stem and a valve core that is limitedly connected or fixedly connected to the valve stem. The valve stem is at least partially located in the bellows and connected to the bellows. The valve stem can drive the valve core to abut against or away from the valve mouth 11 through the threaded matching action of the threaded substructure and the elastic force of the bellows.

[0016] 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.

[0017] 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 core 30 is slidably matched with the inner wall surface of the valve seat 10. In this embodiment, the valve core 30 is provided with a coating portion 31 as an example for explanation. The coating portion 31 may include polyparaxylene resin, which can be applied to the outer surface of the valve core 30 by brushing, spraying and dipping. The polyparaxylene resin has the characteristics of moisture resistance and strong corrosion resistance. During the coating process, less thermal pressure is generated on the components, and it grows outward from the surface of the substrate to form a uniform coating with a certain thickness. The coating portion 31 is directly slidably guided with the inner wall surface 12 of the valve seat 10. It should be noted that the sliding guide cooperation here refers to direct contact. Of course, the coating material can also be other ceramic coating methods. The non-metallic coating part 31 is directly slidably guided with the inner wall surface 12 of the metal valve seat 10. The coating part 31 has a certain thickness, which can relatively increase the radial width of the valve core 30 in the radial direction, so as to achieve the stability of the actuation cooperation with the valve seat during the actuation process. At the same time, the direct sliding guiding cooperation between the non-metallic coating part 31 and the inner wall surface 12 of the metal valve seat 10 can relatively reduce the actuation noise between the valve core and the valve seat during the actuation process, thereby improving the comfort of use. The valve core 30 is also provided with a connecting hole, which can be directly opened in the coating part 31, that is, the required gap is directly left when the coating part 31 is coated, and the gap forms a connecting hole, which relatively reduces the process of machining on the valve core body; or machining can be used to directly penetrate the upper and lower surfaces of the body of the valve core 30, or it can be opened in the coating part and the body of the valve core at the same time according to the hole depth requirements. When the valve is closed, the connecting hole can balance the pressure of the upper and lower cavities;

[0018] The second embodiment is described below. The difference from the above embodiment is that in this embodiment, the coating part is coated on the inner wall surface of the valve seat, and the coating part directly slidably cooperates with the outer surface of the valve core 30. Similarly, the coating part may include polyparaxylene resin or adopt ceramic coating, and at least the inner wall surface of the valve seat that cooperates with the outer surface of the valve core is coated with the coating part, which can also achieve the technical effect of the present application.

[0019] The third embodiment is described below. In this embodiment, the outer surface of the valve core 30 is coated with a valve core coating portion, and the inner wall surface of the valve seat is also coated with a valve seat coating portion. When the two are coordinated, the valve core coating portion and the valve seat coating portion slide together, which can also achieve the technical effect of the present application.

[0020] 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 valve core is provided with a coating portion, the valve seat is provided with an inner wall surface, the coating portion and the inner wall surface are slidably matched; or the valve seat is provided with a coating portion, and the outer surface of the valve core is slidably matched with the coating portion.

[0021] The utility model provides an electronic expansion valve, wherein a coating portion is added to a valve core or a valve seat, and the valve core and the valve seat are slidably matched through the coating portion. Through the cooperation between the non-metallic coating portion and the metal parts, the radial dimension of the valve core is relatively thickened, which can relatively ensure the stability of the valve core during actuation and improve the actuation noise between the valve core and the valve seat.

[0022] The present application also 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 move away from the valve mouth portion, the valve core is provided with a valve core coating portion, and the valve seat is provided with a valve seat coating portion, the valve core coating portion and the valve seat coating portion slidingly cooperate.

[0023] By providing a coating portion on the outer peripheral surface of the valve core and the inner wall surface of the valve seat, the valve core coating portion and the valve seat coating portion are slidably matched, which can relatively ensure the stability of the valve core during actuation and improve the actuation noise between the valve core and the valve seat.

[0024] The present application also provides an electronic expansion valve, including a coil component, a reduction gear mechanism, a threaded fitting sub-mechanism, a bellows component, a valve stem assembly and a valve seat, 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 which is limitedly connected or fixedly connected to the valve stem, the valve stem is at least partially located in the bellows component and connected to the bellows, through the threaded fitting action of the threaded fitting sub-mechanism and the elastic transmission action of the bellows component, the valve core can abut against or move away from the valve mouth portion, the valve core and the valve seat are slidably fitted, and a coating portion is provided between the valve core and the valve seat.

[0025] By adding a coating portion between the valve core and the valve seat, or by adding a coating portion on the valve core or the valve seat, the valve core and the valve seat are slidably fitted through the coating portion, and the radial dimension of the valve core is relatively thickened through the fit between the non-metallic coating portion and the metal parts, which can relatively guarantee the stability of the valve core during actuation and improve the actuation noise between the valve core and the valve seat; or by providing a coating portion on the outer peripheral surface of the valve core and the inner wall surface of the valve seat, so that the coating portion of the valve core and the coating portion of the valve seat are slidably fitted, which can relatively guarantee the stability of the valve core during actuation and improve the actuation noise between the valve core and the valve seat.

[0026] 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 valve core is provided with a coating portion, the valve seat is provided with an inner wall surface, the coating portion is slidably matched with the inner wall surface; or the valve seat is provided with a coating portion, and the outer surface of the valve core is slidably matched with the coating portion.

2. The electronic expansion valve according to claim 1, characterized in that: The outer surface of the valve core is coated with the coating portion, and the coating portion is directly slidably matched with the inner wall surface of the valve seat.

3. The electronic expansion valve according to claim 1, characterized in that: The inner wall surface of the valve core is coated with the coating portion, and the coating portion is directly slidably matched with the outer surface of the valve core.

4. The electronic expansion valve according to claim 3, characterized in that: At least the portion of the inner wall surface that matches the valve core guide is coated with the coating portion.

5. The electronic expansion valve according to any one of claims 1 to 4, characterized in that: The coating portion includes polyparaxylene resin.

6. The electronic expansion valve according to claim 5, characterized in that: The polyparaxylene resin is coated on the outer surface of the valve core or the inner wall surface of the valve seat by brushing, spraying or dipping.

7. The electronic expansion valve according to any one of claims 1 to 4, characterized in that: The valve core is provided with a communicating hole to balance the upper and lower cavities.

8. The electronic expansion valve according to claim 7, characterized in that: The communicating hole is directly opened in the coating portion.

9. 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 valve core is provided with a valve core coating portion, and the valve seat is provided with a valve seat coating portion, and the valve core coating portion is slidably matched with the valve seat coating portion.

10. An electronic expansion valve, characterized in that: The invention comprises a coil component, a reduction gear mechanism, a threaded fitting sub-mechanism, a bellows component, a valve stem assembly and a valve seat, wherein the valve seat comprises a valve mouth portion provided with a valve mouth, the valve stem assembly comprises a valve stem and a valve core which is limitedly connected or fixedly connected to the valve stem, the valve stem is at least partially located in the bellows component and is connected to the bellows, through the threaded fitting action of the threaded fitting sub-mechanism and the elastic transmission action of the bellows component, the valve core can abut against or move away from the valve mouth portion, the valve core is slidably fitted with the valve seat, and a coating portion is provided between the valve core and the valve seat.

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