Valve device

Abstract

According to the valve device, at least part of a lead screw is arranged to be of a solid structure, the lead screw comprises an end head part, the end head part is of an equal-diameter structure, the overall strength of the lead screw is more reliable, meanwhile, the end head part is of the equal-diameter structure, machining is more convenient and faster, and when a lead screw part drives a valve needle part to do frequent axial lifting motion, the valve needle part is not prone to falling off. The lead screw is better in durability and higher in strength.

Description

Technical Field

[0001] This application relates to the technical field of refrigeration control, and particularly relates to a valve device.

Background Art

[0002] Electronic expansion valves are commonly used in refrigeration systems to regulate the flow rate of refrigerant, including a valve body with a valve port, a valve needle component, and a lead screw component. The lead screw component is floatingly connected to the valve needle component. The valve needle component can abut or move away from the valve port. During the actuation process, under the action of external coil excitation, the lead screw component drives the valve needle component to perform frequent axial lifting and lowering movements. For those skilled in the art, it is necessary to improve the strength of the lead screw and the processing convenience as much as possible.

Utility Model Content

[0003] The purpose of the present utility model is to provide a valve device with a new structure, which can relatively improve the strength of the lead screw and the processing convenience.

[0004] The present utility model provides a valve device, including a valve core lead screw assembly. The valve core lead screw assembly includes a valve core assembly and a lead screw assembly connected to the valve core assembly. The lead screw assembly includes a lead screw, a bearing, and a bushing. At least part of the lead screw is a solid structure. The lead screw includes a flange portion and a head portion axially extending downward from the flange portion. The head portion is a constant diameter structure. The bearing is sleeved on the outer periphery of the head portion and fixedly connected to the head portion. The bushing is at least partially sleeved on the outer periphery of the head portion and fixedly connected to the head portion. The flange portion and the bushing axially limit the bearing.

[0005] For the valve device provided by the present utility model, by setting at least part of the lead screw as a solid structure, and the lead screw includes a head portion which is a constant diameter structure, the overall strength of the lead screw is more reliable. At the same time, since the head portion is a constant diameter structure, it is more convenient for processing. During the frequent axial lifting and lowering movement of the lead screw component driving the valve needle component, the durability of the lead screw is better and the strength is higher.

Description of the Drawings

[0006] Figure 1 It is a schematic cross-sectional view of the overall structure of the valve device provided by this application;

[0007] Figure 2 For Figure 1 a schematic cross-sectional view of the structure of the valve core lead screw assembly of the valve device;

[0008] Figure 3 It is a schematic cross-sectional view of the lead screw assembly structure of the valve device provided by this application;

[0009]

Reference Signs

[0010] Valve seat 10, valve orifice portion 11, first connecting pipe 100, second connecting pipe 200, valve core screw rod assembly 20, screw rod 21, end head portion 211, flange portion 212, bearing 22, bushing 23, valve core 24, mounting groove 241, abutting portion 242, sealing portion 243, valve core sleeve 25, elastic member 26, guide seat 30, nut assembly 40, nut 41, connecting member 42, guiding portion 411, mounting cavity 24A, first flow passage S1, second flow passage S2, seal 300

Detailed implementation manner

[0011] In order to enable those skilled in the art to better understand the technical solutions provided by this application, the technical solutions of this application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0012] Referring to Figures 1-3 As shown, this application provides a valve device, including a valve seat 10 and a guide seat 30. The valve seat 10 is fixedly connected to the guide seat 30. The valve seat 10 is provided with a valve orifice portion 11. The valve seat 10 can be an integral structure, and the valve orifice portion 11 is directly formed on the valve seat, or the valve orifice portion 11 can also be a separate component and be fixedly connected to the valve seat by welding or other means. The side and bottom of the valve seat 10 are respectively provided with a first connection port portion and a second connection port portion to respectively achieve fixed connection with the first connecting pipe 100 and the second connecting pipe 200. The valve device further includes a housing, and the housing is fixedly connected to the valve seat 10 to form a receiving cavity. The valve device further includes a nut assembly 40. The nut assembly 40 is disposed in the receiving cavity. The nut assembly 40 includes a nut 41 and a connecting member 42. The connecting member 42 is fixedly connected to the valve seat 10 so that the nut assembly 40 is integrally mounted on the valve seat 10. The nut 41 is provided with a guiding portion 411. At least a part of the extending portion of the guide seat 30 is located in the nut 41. The outer wall of the extending portion is in guiding cooperation with the guiding portion 411, and the inner wall of the extending portion of the guide seat 30 is in guiding cooperation with the valve core 24, which can relatively ensure the coaxiality among the nut assembly, the guide seat, the valve core screw rod assembly and the valve orifice portion 11;

[0013] The valve core screw rod assembly 20 includes a valve core assembly and a screw rod assembly. The valve core assembly includes a valve core 24 and a valve core sleeve 25. The valve core 24 and the valve core sleeve 25 can be set as an integral structure or can be separately arranged and then fixedly connected. The valve core 24 is of an integral structure, and the valve core sleeve 25 is fixedly connected to the upper end of the valve core 24. The valve core 24 is provided with an installation cavity 24A, a first flow passage S1, and a second flow passage S2. The first flow passage S1 is located between the installation cavity 24A and the second flow passage S2. The second flow passage S2 is closer to the valve port portion 11 than the first flow passage S1. The inner diameter of the installation cavity 24A is larger than the inner diameter of the first flow passage S1, and the inner diameter of the second flow passage S2 is larger than the inner diameter of the first flow passage S1. Through the above design, when the sealing portion 243 of the valve core 24 abuts against the valve port portion 11, the cavity pressure of the accommodation cavity where the nut assembly 40 is located is communicated with the inside of the valve core 24 through the through hole of the valve core 24, so as to achieve pressure balance. Through the above design, a Venturi effect is formed inside the valve core 24, and the refrigerant can achieve noise reduction when passing through the valve core, thereby improving the comfort when using the valve. The valve core 24 includes an abutting portion 242 and is provided with an installation groove 241. The installation groove 241 is recessed from the outer surface of the valve core 24. The valve device further includes a sealing member 300. At least part of the sealing member 300 is limited in the installation groove 241. The valve core 24 is slidably matched with the guide seat 30. The sealing member 300 is sealingly matched with the valve core and the sealing member 300 is sealingly matched with the guide seat 30 to prevent the outward leakage of the refrigerant;

[0014] The valve core screw rod assembly 20 includes a screw rod assembly 21. The screw rod assembly includes a screw rod 21, a bearing 22, and a bushing 23. At least a part of the screw rod 21 is arranged as a solid structure. The screw rod 21 includes a flange portion 212 and a head portion 211 axially extending downward from the flange portion 212. The head portion 211 is of a constant diameter structure. It should be noted here that the constant diameter structure means that the head portion 211 has the same diameter up and down. The bearing 22 is sleeved on the outer peripheral portion of the head portion 211 and is fixedly connected to the head portion through the inner ring of the bearing. The bushing 23 is located below the bearing 22 and at least partially sleeved on the outer peripheral portion of the head portion. The bushing 23 can be fixedly connected to the head portion through spot welding or other means at the lower end portion. The flange portion 212 and the bushing 23 axially limit the bearing 22. Specifically, one end portion of the bearing 22 directly or indirectly abuts against the flange portion 212, and the other end portion directly or indirectly abuts against the bushing 23. The valve core screw rod assembly further includes an elastic member 26. A part of the elastic member 26 is located on the outer peripheral portion of the bushing 23 and has a preset distance from the bushing 23. One end portion of the elastic member 26 directly abuts against the bearing, and the other end portion directly abuts against the abutting portion 242. The bearing 22 can abut against or move away from the valve core sleeve 25. Through the above improvements, when the screw rod assembly drives the valve core assembly to perform frequent axial lifting movements, the screw rod can improve its own strength and reliability. At the same time, the design of the constant diameter structure for the head portion facilitates processing. The present invention provides a valve device, including a valve core screw rod assembly. The valve core screw rod assembly includes a valve core assembly and a screw rod assembly connected to the valve core assembly. The screw rod assembly includes a screw rod, a bearing, and a bushing. At least a part of the screw rod is a solid structure. The screw rod includes a flange portion and a head portion axially extending downward from the flange portion. The head portion is of a constant diameter structure. The bearing is sleeved on the outer peripheral portion of the head portion and fixedly connected to the head portion. The bushing is at least partially sleeved on the outer peripheral portion of the head portion and fixedly connected to the head portion. The flange portion and the bushing axially limit the bearing.

[0015] In the valve device provided by the present invention, by arranging at least a part of the screw rod as a solid structure, and the screw rod includes a head portion which is of a constant diameter structure, the overall strength of the screw rod is more reliable. At the same time, the head portion being of a constant diameter structure is more convenient for processing. During the frequent axial lifting movement of the screw rod component driving the valve needle component, the screw rod has better durability and higher strength.

[0016] In the present invention, specific embodiments are described. However, it is obvious that various modifications and transformations can still be made without departing from the spirit and scope of the present invention. Therefore, the specification and the drawings should be regarded as illustrative rather than restrictive.

Claims

1. A valve device, characterized in that: It includes a valve core screw rod assembly, which includes a valve core assembly and a screw rod assembly connected to the valve core assembly, the screw rod assembly includes a screw rod, a bearing and a bushing, the screw rod is at least partially a solid structure, the screw rod includes a flange portion and an end portion extending axially downward from the flange portion, the end portion is an equal-diameter structure, the bearing is sleeved on the outer periphery of the end portion and fixedly connected to the end portion, the bushing is at least partially sleeved on the outer periphery of the end portion and fixedly connected to the end portion, and the flange portion and the bushing axially limit the bearing.

2. The valve device according to claim 1, characterized in that One end of the bearing abuts against the flange portion, and the other end of the bearing abuts against the bushing.

3. The valve device according to claim 1, characterized in that The lower end portion of the bushing is fixed to the end portion by spot welding.

4. The valve device according to claim 1, characterized in that The valve core assembly comprises a valve core and a valve core sleeve, the valve core is an integral structure, and the valve core sleeve is fixedly connected to the valve core or is an integral structure.

5. The valve device according to claim 4, characterized in that The valve core is provided with a mounting groove, and the mounting groove is recessed inward from the outer surface of the valve core. The valve device also includes a sealing member, and the sealing member is at least partially limited to the mounting groove.

6. The valve device according to claim 5, characterized in that It also includes a guide seat and a valve seat, wherein the guide seat is fixedly connected to the valve seat, the sealing member is sealingly matched with the valve core, and the sealing member is sealingly matched with the guide seat.

7. The valve device according to any one of claims 1 to 6, characterized in that: It also includes an elastic member, the valve core assembly includes a valve core, the valve core is an integrated structure, the valve core includes an abutment portion, the elastic member is located at the outer periphery of the bushing, one end of the elastic member directly abuts against the bearing, and the other end directly abuts against the abutment portion.

8. The valve device according to any one of claims 1 to 6, characterized in that: The valve device includes a valve seat with a valve mouth, and the valve core is provided with a mounting cavity, a first circulation channel and a second circulation channel, wherein the first circulation channel is located between the mounting cavity and the second circulation channel, and the second circulation channel is closer to the valve mouth than the first circulation channel.

9. The valve device according to claim 8, characterized in that The inner diameter of the second circulation channel is larger than the inner diameter of the first circulation channel, and the inner diameter of the installation cavity is larger than the inner diameter of the first circulation channel.

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