Electric valve and lead screw component
By setting a wear-reducing structure between the guide fit section of the screw rod and the limit seat in the electric valve, the problem of degradation of the action performance caused by the wear of the screw rod and the limit seat is solved, and higher operation reliability and service life are achieved.
Patent Information
- Application Number
- CN202311798737.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-25
- Publication Date
- 2025-06-27
AI Technical Summary
In electric valves, wear between the screw rod and the limit seat will cause an increase in the operating voltage, affecting the operating performance of the electric valve.
A wear reduction structure is provided between the screw and the guide fit section of the limit seat, including a plastic ring or lubricating oil, to reduce friction and wear.
By reducing friction between the screw rod and the limit seat, the reliability of the screw rod operation and the operation performance of the electric valve are improved, and the service life of the screw rod components is extended.
Smart Images
Figure CN120212301A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of valve components, and particularly to an electric valve and a lead screw component. Background Art
[0002] Please refer to Figure 1 , an electric valve includes a driving part 10, a lead screw 21, a nut 30, a valve needle component 40, and a valve seat component 50. Among them, the rotor 11 of the driving part 10 is fixedly connected to the lead screw 21. The lead screw 21 is threadedly connected to the nut 30. The nut 30 is connected to the valve needle component 40. The valve seat component 50 has an inlet, an outlet, and a valve port. The inlet can be communicated with the outlet through the valve port.
[0003] During operation, the rotor 11 of the driving part 10 drives the lead screw 21 to rotate. Under the action of screw drive, the nut 30 can drive the valve needle component 40 to move along the axial direction of the valve seat component 50 to open or close the valve port, thereby realizing the conduction or cutoff of the flow path between the inlet and the outlet.
[0004] To limit the circumferential rotation of the nut 30 and ensure the stability of the rotation of the lead screw 21, the electric valve is provided with a limit seat 22. The lead screw 21 rotatably passes through the limit seat 22. A bearing 23 is provided between the lead screw 21 and the limit seat 22. In order to reduce the yaw of the lead screw 21 caused by the clearance of the bearing 23, the limit seat 22 is provided with a guiding section that cooperates with the lead screw 21. In practical applications, the long-term wear between the guiding section and the lead screw 21 will cause the required operating voltage to increase, affecting the operating performance of the electric valve. Summary of the Invention
[0005] The purpose of this application is to provide an electric valve and a lead screw component. By optimizing the structure of the lead screw component, the wear between the lead screw and the limit seat can be reduced, which is beneficial to improving the operating performance of the electric valve.
[0006] To solve the above technical problems, this application provides a lead screw component for an electric valve. The lead screw component includes a lead screw and a limit seat; the lead screw is rotatably inserted into the limit seat, and the lead screw and the limit seat are axially limited and connected in the axial direction of the lead screw; the limit seat has a guiding hole section, the lead screw has a guiding rod section, and a wear-reducing structure is provided between the guiding rod section and the guiding hole section.
[0007] For the lead screw component used in the electric valve, a friction-reducing structure is provided between the guiding and mating sections of the lead screw and the limit seat, which can reduce the friction between the lead screw and the limit seat in the guiding and mating sections, reduce the wear of the lead screw and the limit seat, is beneficial to improving the reliability of the lead screw operation, and is also beneficial to extending the service life of the lead screw component.
[0008] For the lead screw component as described above, the wear-reducing structure includes a plastic ring.
[0009] The lead screw component as described above, wherein an annular groove is provided on the guide rod section, or an annular groove is provided on the guide hole section; the plastic ring is installed in the annular groove in a limited manner.
[0010] The lead screw component as described above, wherein the plastic ring is a PTFE ring or a PPS ring.
[0011] The lead screw component as described above, wherein there are two or more plastic rings.
[0012] The lead screw component as described above, wherein the anti-friction structure includes lubricating oil.
[0013] The lead screw component as described above, wherein an annular oil storage groove is provided on the guide rod section, or an annular oil storage groove is provided on the guide hole section; the lubricating oil is arranged in the oil storage groove.
[0014] The lead screw component as described above, wherein there are two or more oil storage grooves.
[0015] The lead screw component as described above, wherein a bearing is provided between the limit seat and the lead screw, and the anti-friction structure is located below the bearing.
[0016] The present invention also provides an electric valve, which includes a driving part and a lead screw component. The driving part is used to drive the lead screw of the lead screw component to rotate, and the lead screw component is the lead screw component described in any one of the above.
[0017] Since the above lead screw component has the above technical effects, the electric valve including this lead screw component also has corresponding technical effects, which will not be repeated here. Description of the Drawings
[0018] Figure 1 It is a schematic cross-sectional view of an electric valve in the related art;
[0019] Figure 2 It is a schematic cross-sectional view of the lead screw component of the first embodiment provided by the present application;
[0020] Figure 3 For Figure 2 The cross-sectional view of the lead screw in
[0021] Figure 4 It is a schematic cross-sectional view of the lead screw component of the second embodiment provided by the present application;
[0022] Figure 5 For Figure 4 The cross-sectional view of the limit seat in
[0023] Figure 6 It is a schematic cross-sectional view of the lead screw component of the third embodiment provided by the present application;
[0024] Figure 7 ForFigure 6 Schematic cross-sectional view of the middle lead screw
[0025] Figure 8 Schematic cross-sectional view of the lead screw component of the fourth embodiment provided by the present application
[0026] Figure 9 is Figure 8 Schematic cross-sectional view of the limit seat in
[0027] Explanation of reference numerals in the drawings:
[0028] Drive part 10, rotor 11;
[0029] Lead screw components 20, 20A, 20B, 20C, 20D, lead screw 21, guide rod section 211, first annular groove 212, first oil storage groove 213, limit seat 22, guide hole section 221, second annular groove 222, second oil storage groove 223, bearing 23, plastic ring 24,
[0030] Nut 30, valve needle component 40, valve seat component 50. Detailed implementation manners
[0031] In order to enable those skilled in the art to better understand the solution of the present application, the present application will be further described in detail below with reference to the drawings and specific implementation manners.
[0032] For the convenience of understanding and concise description, the electric valve and the lead screw component will be described together below, and the beneficial effects will not be repeated.
[0033] The electric valve includes a drive part and a lead screw component. The rotor of the drive part is fixedly connected to the lead screw of the lead screw component and is used to drive the lead screw to rotate, so as to drive the valve needle to move through a structure (such as a nut) that is in transmission connection with the lead screw to achieve valve opening or closing.
[0034] This article focuses on the structural improvement of the lead screw component of the electric valve. The electric valve can be Figure 1 the electric valve shown in Figure 1 or other valve structures. The lead screw component will be introduced in detail below. Taking the electric valve shown in
[0035] Please refer to Figure 2 and Figure 3 , Figure 2 Schematic cross-sectional view of the lead screw component of the first embodiment provided by the present application; Figure 3 is Figure 2 Schematic cross-sectional view of the lead screw in
[0036] In this embodiment, the lead screw component 20A includes a lead screw 21 and a limit seat 22. The lead screw 21 is rotatably inserted into the limit seat 22, and the lead screw 21 and the limit seat 22 are limitedly connected in the axial direction of the lead screw 21. That is to say, the positions of the lead screw 21 and the limit seat 22 are relatively fixed in the axial direction, and the lead screw 21 can only rotate circumferentially relative to the limit seat 22.
[0037] When applied to an electric valve, the lead screw 21 is fixedly connected to the rotor 11 of the driving part 10 of the electric valve. When the rotor 11 rotates, it drives the lead screw 21 to rotate together. The limit seat 22 is relatively fixed to the valve seat component 50 of the electric valve. Here, the relative fixation means that the relative position between the limit seat 22 and the valve seat component 50 remains unchanged. In some embodiments, the limit seat 22 can be directly fixedly connected to the valve seat component 50, or can be fixedly connected to the valve seat component 50 through other intermediate components.
[0038] At least a part of the lead screw 21 passes through the limit seat 22 to facilitate cooperation with transmission structures such as the nut 30. A bearing 23 is provided between the lead screw 21 and the limit seat 22 to ensure the stability and reliability of the rotation of the lead screw 21.
[0039] To prevent the lead screw 21 from yawing, the lead screw 21 has a guide rod section 211, and the limit seat 22 has a guide hole section 221. A wear-reducing structure is provided between the guide rod section 211 and the guide hole section 221.
[0040] The lead screw 21 has an external thread part, and the external thread part is located below the guide rod section 211 to facilitate threaded cooperation with the nut 30.
[0041] In this embodiment, the wear-reducing structure includes a plastic ring 24. The guide rod section 211 of the lead screw 21 has a first annular groove 212, and the plastic ring 24 is installed in the first annular groove 212. After the lead screw 21 and the limit seat 22 are assembled, the plastic ring 24 is located between the outer peripheral wall of the guide rod section 211 and the hole wall of the guide hole section 221. During operation, when the lead screw 21 yaws due to bearing clearance, the plastic ring 24 installed on the guide rod section 211 contacts the guide hole section 221 of the limit seat 22, reducing the friction between the guide hole section 221 and the guide rod section 211, which is beneficial to improving the operating performance of the valve, reducing the wear of the lead screw 21 and the limit seat 22, and is beneficial to extending the service life of the lead screw component 20A.
[0042] In a specific solution, the plastic ring 24 can be a PTFE (Polytetrafluoroethylene) ring, that is, the plastic ring 24 is a ring structure made of PTFE material. The plastic ring 24 can also be a PPS (Polyphenylene Sulfide) ring, that is, the plastic ring 24 is a ring structure made of PPS material. Both the PTFE ring and the PPS ring have a small coefficient of friction, which can effectively reduce the frictional force between the lead screw 21 and the limit seat 22.
[0043] Of course, the plastic ring 24 can also be made of other plastics with a small coefficient of friction.
[0044] In the illustrated solution, a plastic ring 24 is provided between the lead screw 21 and the limit seat 22. It can be understood that in other embodiments, two or more first annular grooves 212 can be axially provided on the guide rod section 211 of the lead screw 21, and a plastic ring 24 is installed in each first annular groove 212.
[0045] Please refer to Figure 4 and Figure 5 , Figure 4 which is a schematic cross-sectional view of the lead screw component of the second embodiment provided by the present application; Figure 5 is Figure 4 a schematic cross-sectional view of the limit seat in
[0046] Compared with the lead screw component 20A provided in the foregoing first embodiment, the lead screw component 20B provided in this embodiment has the same basic structural composition. The difference is that in this embodiment, a second annular groove 222 is provided on the guide hole section 221 of the limit seat 22, and the plastic ring 24 is specifically installed in the second annular groove 222. During operation, when the lead screw 21 deflects due to the clearance of the bearing 23, the lead screw 21 is in direct contact with the plastic ring 24, reducing the frictional force between the lead screw 21 and the limit seat 22 and reducing the wear on the lead screw 21 and the limit seat 22.
[0047] In the illustrated example, a second annular groove 222 is provided on the guide hole section 221 of the limit seat 22. In other embodiments, two or more second annular grooves 222 can also be provided on the guide hole section 221, and a plastic ring 24 is provided in each second annular groove 222.
[0048] The plastic ring 24 can also be selected as a PTFE ring or a PPS ring.
[0049] When there are two or more plastic rings 24 provided between the guide rod section 211 of the lead screw 21 and the guide hole section 221 of the limit seat 22, the annular grooves for installing the plastic rings 24 can be partially provided on the guide rod section 211 and partially provided on the guide hole section 221.
[0050] Please refer toFigure 6 and Figure 7 , Figure 6 is a schematic cross-sectional view of the lead screw component according to the third embodiment provided by the present application; Figure 7 is Figure 6 a schematic cross-sectional view of the lead screw in
[0051] Compared with the lead screw component 20A provided in the foregoing first embodiment, the lead screw component 20C provided in this embodiment has a similar basic structural composition, and also includes a lead screw 21 and a limit seat 22. The cooperation relationship between the lead screw 21 and the limit seat 22 is the same. The difference between the two lies in the specific form of the anti-friction structure.
[0052] In this embodiment, the anti-friction structure includes lubricating oil. The lead screw component 20C is provided with a first oil storage groove 213 on the guide rod section 211 of the lead screw 21. The first oil storage groove 213 is provided with lubricating oil. After the lead screw 21 and the limit seat 22 are assembled, the lubricating oil is located between the guide rod section 211 and the guide hole section 221. During operation, when the lead screw 21 is deflected due to the bearing clearance, due to the presence of lubricating oil between the guide rod section 211 and the guide hole section 221, under the lubricating and heat dissipating effects of the lubricating oil, the friction coefficient between the lead screw 21 and the limit seat 22 can be reduced, the friction force between the guide hole section 221 and the guide rod section 211 is reduced, which is beneficial to improving the operating performance of the valve, reducing the wear of the lead screw 21 and the limit seat 22, and is beneficial to extending the service life of the lead screw component 20C.
[0053] In the illustrated example, two first oil storage grooves 213 are provided on the guide rod section 211 of the lead screw 21. It can be understood that in other embodiments, the number of the first oil storage grooves 213 can be set as required, for example, it can be set to one, or it can be set to three or more.
[0054] Please refer to Figure 8 and Figure 9 , Figure 8 is a schematic cross-sectional view of the lead screw component according to the fourth embodiment provided by the present application; Figure 9 is Figure 8 a schematic cross-sectional view of the limit seat in
[0055] Compared with the lead screw component 20C provided in the foregoing third embodiment, the lead screw component 20D provided in this embodiment has a similar structural composition. The difference is that in this embodiment, a second oil storage groove 223 is provided on the guide hole section 221 of the limit seat 22, and the lubricating oil is arranged in the second oil storage groove 223. During operation, when the lead screw 21 is deflected due to the clearance of the bearing 23, the lead screw 21 avoids direct contact with the limit seat 22 through the lubricating oil. Under the lubricating and cooling effects of the lubricating oil, the friction coefficient between the lead screw 21 and the limit seat 22 can be reduced, the friction force between the lead screw 21 and the limit seat 22 is reduced, and the wear of the lead screw 21 and the limit seat 22 is reduced.
[0056] In the illustrated example, two second oil storage grooves 223 are provided on the guiding hole section 221 of the limit seat 22. In other embodiments, one or more than three second oil storage grooves 223 can also be provided on the guiding hole section 221.
[0057] In other embodiments, oil storage grooves can be provided on both the guiding rod section 211 of the lead screw 21 and the guiding hole section 221 of the limit seat 22 simultaneously.
[0058] In other embodiments, a plastic ring 24 and lubricating oil can be provided between the guiding rod section 211 of the lead screw 21 and the guiding hole section 221 of the limit seat 22 simultaneously to achieve the effect of reducing wear. In practical applications, it can be selected according to needs, and no further examples will be given one by one.
[0059] In the above embodiments, the anti-friction structure is arranged below the bearing 23 to facilitate the assembly between the lead screw 21 and the limit seat 22.
[0060] The above has introduced in detail an electric valve and a lead screw component provided by the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.
Claims
1. A lead screw component for an electric valve, characterized in that, The screw rod component includes a screw rod and a limit seat; the screw rod is rotatably inserted into the limit seat, and the screw rod and the limit seat are limitedly connected in the axial direction of the screw rod; the limit seat has a guiding hole section, the screw rod has a guiding rod section, and an anti-friction structure is provided between the guiding rod section and the guiding hole section.
2. The lead screw component according to claim 1, characterized in that, The anti-friction structure includes a plastic ring.
3. The lead screw component according to claim 2, wherein, An annular groove is provided on the guiding rod section, or an annular groove is provided on the guiding hole section; the plastic ring is limitedly installed in the annular groove.
4. The lead screw component according to claim 2 or 3, characterized in that, The plastic ring is a PTFE ring or a PPS ring.
5. The lead screw component according to claim 2 or 3, characterized in that, There are two or more plastic rings.
6. The lead screw component according to claim 1, wherein, The anti-friction structure includes lubricating oil.
7. The lead screw component according to claim 6, characterized in that, An annular oil storage groove is provided on the guiding rod section, or an annular oil storage groove is provided on the guiding hole section; the lubricating oil is provided in the oil storage groove.
8. The lead screw component according to claim 6 or 7, characterized in that There are two or more oil storage grooves.
9. The lead screw component according to any one of claims 1-3, 6-7, characterized in that, A bearing is provided between the limit seat and the screw rod, and the anti-friction structure is located below the bearing.
10. An electric valve, comprising a driving part and a lead screw component, wherein the driving part is used to drive the rotation of the lead screw of the lead screw component, characterized in that, The screw rod component is the screw rod component according to any one of claims 1-9.