Electric valve

Abstract

The invention discloses an electric valve which comprises a nut component and a screw rod valve element component, the nut component comprises a nut, the screw rod valve element component comprises a screw rod component and a valve element component, the screw rod component comprises a screw rod and a bearing, the screw rod is in threaded connection with the nut, the bearing is arranged on the periphery of the screw rod in a sleeving mode, and the bearing is connected with the screw rod. The lead screw component can drive the valve element component to move in the axial direction, the valve element component comprises a valve element body, a bearing seat and an elastic piece, the valve element body comprises an upper blocking part, the bearing seat and the elastic piece are located in an inner cavity of the valve element body, the elastic piece supports the bearing seat, one end of the elastic piece abuts against the bearing seat, and the other end of the elastic piece abuts against the valve element body. The bearing seat abuts against the upper blocking part. The bearing seat comprises a radial limiting part and an axial limiting part, the outer wall of the bearing is located between the upper blocking part and the axial limiting part, the outer wall of the bearing is in clearance fit with the radial limiting part, the height of the outer wall of the bearing is smaller than that of the radial limiting part, and the risk that the lead screw vibrates due to pulse force can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid control, in particular to an electric valve. Background Art

[0002] In the field of fluid control technology, such as refrigeration technology, electric valves can be used to cut off or regulate refrigerant or adjust the compressor suction pressure. Figure 6 The figure shows a schematic diagram of the structure of an electric valve of the background technology. As shown in the figure, the electric valve includes a rotor 01, a screw 02 fixedly connected to the rotor 01, a ball bearing 04 fixedly connected to the screw 02, a valve stem 06 drivingly connected to the screw 02, and a spring 05 located at the lower end of the bearing 04 and inside the valve stem 06. The screw 02 is threadedly connected to the nut 03, and the screw 02 can move axially relative to the thread 03 to drive the valve stem 06 and the seal 07 to move axially so that the seal 07 opens or closes the valve port of the electric valve. In the electric valve, the upper and lower ends of the inner ring of the bearing 04 abut against the screw 02, and the outer ring of the bearing 04 abuts against the spring 05. In the process of opening and closing the valve, especially in the process of closing the valve, once the bearing 04 is deflected due to vibration, due to the transmission of force, the screw 02 has the risk of deflection or even breakage, which affects the reliability of the screw, thereby affecting the reliability of the action of the electric valve. Summary of the invention

[0003] The purpose of the present application is to provide an electric valve that can improve the risk of the lead screw being vibrated by pulsating forces.

[0004] The electric valve comprises a nut component and a screw valve core component, wherein the nut component comprises a nut, the screw valve core component comprises a screw component and a valve core component, the screw component comprises a screw and a bearing, the screw is threadedly connected with the nut, the bearing is sleeved on the outer periphery of the screw, the bearing is connected with the screw, the screw component can drive the valve core component to move axially, the valve core component comprises a valve core body, a bearing seat and an elastic member, the valve core body comprises an upper stopper, the bearing seat and the elastic member are located in the inner cavity of the valve core body, the elastic member supports the bearing seat, one end of the elastic member abuts against the bearing seat, the other end of the elastic member abuts against the valve core body, in the axial direction of the electric valve, the bearing seat abuts against the upper stopper; the bearing seat comprises a radial limiting portion and an axial limiting portion, the outer wall of the bearing is located between the upper stopper and the axial limiting portion, the outer wall of the bearing is clearance-matched with the radial limiting portion, and in the axial direction of the electric valve, the height of the outer wall of the bearing is less than the height of the radial limiting portion. The above-mentioned electric valve, the matching relationship between the bearing seat and the valve core body, the elastic member and the bearing seat and the bearing improves the risk of the screw rod vibrating due to pulsating force. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1The figure shows a schematic structural diagram of a first embodiment of an electric valve of the present invention;

[0006] Figure 2 Shown Figure 1 The schematic diagram of the local structure of the electric valve shown;

[0007] Figure 3 Shown Figure 2 A partial enlarged view of point I in the middle;

[0008] Figure 4A Shown is a schematic structural diagram of an embodiment of a bearing seat;

[0009] Figure 4B Shown Figure 4A A top view of the bearing housing shown;

[0010] FIG. 5A to FIG. 5D A schematic diagram of an assembly sequence of a screw valve stem component is shown;

[0011] in, Figure 5A The figure shows the assembly diagram of the valve sleeve and the screw rod components;

[0012] Figure 5B The figure shows the assembly diagram of the valve sleeve, the screw rod component and the bearing seat;

[0013] Figure 5C The figure shows the assembly diagram of the valve sleeve, the screw rod component, the bearing seat and the elastic component;

[0014] Figure 5D The figure shows the assembly diagram of the valve sleeve, the screw rod component, the bearing seat, the elastic component, the filter component and the valve core;

[0015] Figure 6 Shown is a structural schematic diagram of an electric valve according to the background technology. DETAILED DESCRIPTION

[0016] It should be noted that if directional words, such as "upper" and "lower", are used in this article, they are defined based on the illustrated positions in the drawings of this specification. It should be understood that the use of the directional words is only for the clarity and convenience of describing the technical solution and should not constitute a limitation on the scope of protection.

[0017] The movable connection in this article means that one can directly or indirectly drive the other to move, and under a certain state, the two can move relative to each other.

[0018] In order to enable those skilled in the art to better understand the technical solution of the present application, the technical solution of the present application is further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] like Figure 1As shown, the electric valve includes a valve body component 10, a valve seat component 20, a rotor component 30, a nut component 40 and a screw valve core component 50. The valve body component 10 includes an upper valve body 11, a lower valve body 12, and a connecting sleeve 13, and a first connecting pipe 14 is fixedly connected to the lower valve body 12. The upper valve body 11, the lower valve body 12, and the connecting sleeve 13 are all made of stainless steel. The connecting sleeve 13 is roughly cylindrical, and includes a second inserting portion 132 located inside the lower valve body 12, a first inserting portion 131 located inside the upper valve body 11, and a connecting portion 133 located between the lower end of the upper valve body 11 and the upper end of the lower valve body 12.

[0020] As a specific embodiment, Figure 1 and Figure 2 As shown, the connecting portion 133 and the first inserting portion 131 together form a stepped first positioning portion 1301 , and the connecting portion 133 and the second inserting portion 132 together form a stepped second positioning portion 1302 .

[0021] The lower end of the upper valve body 11 contacts the connection part 133, the outer wall of the first insertion part 131 is interference fit with the inner wall of the upper valve body 11, the upper end of the lower valve body 12 contacts the connection part 133, and the outer wall of the second insertion part 132 is interference fit with the inner wall of the lower valve body 12. At this time, the first welding position is formed at the matching position of the upper valve body 11 and the connection part 133, and the upper valve body 11 and the connection part 133 are fixed by laser welding or argon arc welding at the first welding position. The second welding position is formed at the matching position of the lower valve body 12 and the connection part 133, and the lower valve body 12 and the connection part 133 are fixed by laser welding, argon arc welding or furnace welding at the second welding position.

[0022] The upper valve body 11 can be a stainless steel stretched part, and the lower valve body 12 can be a stainless steel stretched part. The upper valve body 11 and the connecting sleeve 13 are positioned by the first positioning portion 1301, and the lower valve body 12 and the connecting sleeve 13 are positioned by the second positioning portion 1302. Such a design is convenient for positioning and is beneficial to the coaxial accuracy of the upper valve body 11 and the lower valve body 12.

[0023] like Figure 1 As shown, the valve seat component 20 includes a valve seat body 21, a pressure ring 22, a first sealing component 23, and an inner sleeve 24. The valve seat body 21 is welded and fixed to the lower valve body 12, the pressure ring 22 and the valve seat body 21 are riveted and fixed, and the first sealing component 23 is installed between the step hole of the valve seat body 21 and the inner sleeve 24. The first sealing component 23 is made of non-metallic material, such as rubber material, or PTFE material, and the first sealing component 23 includes a sealing portion 231. The second connecting pipe 25 is welded and fixed to the valve seat body 21.

[0024] The rotor component 30, the nut component 40, and the screw valve core component 50 are all disposed in the valve body component 10. Figure 1 and Figure 2 As shown, the nut component 40 includes a nut 41 and a connecting frame 42. The nut 41 is made of plastic, and the connecting frame 42 is made of metal. The connecting frame 42 can be made of stainless steel. The connecting frame 42 is fixed to the nut 41 by injection molding, and the connecting frame 42 is fixedly connected to the connecting sleeve 13.

[0025] The rotor component 30 includes a rotor 31 and a fixing frame 32. The fixing frame 32 is fixedly connected to the rotor 31. The rotor 31 is clearance-matched with the upper valve body 11. The rotor component 30 is connected to the screw valve core component 50. Specifically, the screw valve core component 50 includes a screw component and a valve core component, the screw component includes a screw 33 and a bearing 34, the valve core component includes a valve core body, a bearing seat 53 and an elastic member 54, the valve core body is cylindrical, and the valve core body includes a valve core 51 and a valve sleeve 52. The screw 33 is fixedly connected to the bearing 34, and the elastic member 54 and the bearing seat 53 are located in the inner cavity of the valve core body. The bearing seat 53 is located on the elastic member 54, that is, the elastic member 54 supports the bearing seat 53, and in the axial direction of the electric valve, one end of the bearing seat 53 abuts against the valve core body, and the other end of the bearing seat 53 abuts against the elastic member 54. The upper end of the elastic member 54 is in direct or indirect contact with the bearing seat 53 , and the lower end of the elastic member 54 is in direct or indirect contact with the valve core 51 .

[0026] like Figure 3 and Figure 4A , Figure 4B / Figure 5D As shown, the bearing seat 53 includes a radial limiting portion 531 and an axial limiting portion 532. In the radial direction of the bearing 34, that is, the circumferential direction of the bearing 34, the outer wall of the bearing 34 is clearance-fitted with the radial limiting portion 531, and a single-sided clearance A is provided between the two.

[0027] The bearing 34 is sleeved on the screw rod 33, and the screw rod 33 has a lower step surface 330 facing the bearing 34, one end of the inner wall of the bearing 34 abuts against the lower step surface 330, and the other end of the inner wall of the bearing 34 is riveted to the lower end of the screw rod 33. The inner wall of the bearing 34 and the outer wall of the screw rod 33 can be clearance fit or interference fit.

[0028] When the electric valve is in the open state, in the axial direction of the electric valve, the lower end of the bearing 34 does not contact the axial limit portion 532, that is, there is an axial distance H between the two, and the upper end of the outer wall of the bearing 34 abuts against the valve core component, and the screw component can move the valve core component in the axial direction of the electric valve through the bearing 34. In this article, the axial direction of the electric valve refers to Figure 1 The X direction shown in .

[0029] The electric valve of the above scheme is movably connected with the screw rod component and the valve core component through the setting of the unilateral gap A and the axial distance H. When the valve core component is subjected to the high-frequency pulsation of the system, the valve core component will not transmit the pulsating force to the screw rod component, thereby improving or even eliminating the vibration of the screw rod 33 caused by the high-frequency pulsation in the system, playing a vibration reduction role, and can effectively protect the screw rod 33 from the impact of the system pulse force, thereby improving the operation reliability of the electric valve.

[0030] Furthermore, since the accuracy of the axial distance H directly affects the valve opening pulse, the larger the axial distance H is, the larger the valve opening pulse is. Therefore, the axial distance H value is required to have a higher accuracy. In this solution, by setting the bearing seat 53 of the aforementioned structure, the accuracy of the axial distance H is easy to ensure. The dimensional accuracy of the axial distance H is only guaranteed by the processing accuracy of the height of the bearing seat 53 and the bearing 34. The size range of the axial distance H is greater than or equal to 0.02mm and less than or equal to 1.5mm. If the axial distance H is too small, when the valve core body is deflected, in the valve opening state, there is a potential risk of the bearing 34 contacting and interfering with the bearing seat 53, thereby causing the screw rod 33 to be vibrated by the system pulsation force. If the axial distance H is too large, the axial size of the bearing seat 53 will increase meaninglessly, thereby increasing the size and material cost of the bearing seat 53.

[0031] The value of the aforementioned unilateral clearance A cannot be too small. If it is too small, when the valve core component is deflected by the pulsation force of the system, there is a risk of transmitting the pulsation force to the bearing 34 and then to the screw rod 33. The value of the unilateral clearance A should not be too large. If the value of the unilateral clearance A is too large, the radial dimensions of the relevant parts will be increased. In order to ensure the vibration reduction effect on the screw rod 33, the present application will make the cumulative sum of the dimensions that cause the valve core component to deflect less than the value of the unilateral clearance A, and the unilateral clearance A is greater than or equal to 0.05 mm and less than or equal to 5 mm.

[0032] In this embodiment, the bearing 34 may be a ball bearing. Since the inner ring and the outer ring of the ball bearing are separated, when the valve core component is subjected to force, the design of the aforementioned axial distance H and the unilateral clearance A can provide a certain degree of free movement space for the bearing 34, and the force on the bearing 34 is greatly reduced, which can effectively increase the service life cycle of the bearing 34. Specifically, in this embodiment, the bearing 34 includes a bearing inner ring 341, a bearing outer ring 342, and a ball 343 located between the bearing inner ring 341 and the bearing outer ring 342. The lower end of the screw rod 33 is fixedly connected to the bearing inner ring 341 by riveting, and the two can also be fixedly connected by welding.

[0033] The aforementioned bearing 34 may not be a ball bearing, for example, it may be a part made of other materials for anti-friction lubrication.

[0034] like Figure 3 and Figure 4AAs shown, in this embodiment, a ball bearing is still used as an example for explanation. Specifically, the radial limiting portion 531 is cylindrical, the outer wall of the bearing outer ring 342 is clearance-matched with the inner wall of the radial limiting portion 531, and the axial limiting portion 532 is annular and extends from the lower end of the radial limiting portion 531 toward the central axis of the radial limiting portion 531, and has an axially penetrating bearing seat through hole 530. The axial limiting portion 532 can limit the axial position of the bearing 34. The outer diameter of the bearing 34, that is, the outer diameter of the bearing outer ring 342, is larger than the aperture of the bearing seat through hole 530 of the axial limiting portion 532, so that the bearing 34 will not slip out of the bearing seat 53 from the bearing seat through hole 530.

[0035] The height of the radial limit portion 531 is defined as h1, and the height of the bearing 34 is defined as h2. The bearing 34 is located in the radial limit portion 531, h1>h2, and the aforementioned axial distance H=h1-h2, so that the size of the axial distance H is easy to calculate, and it is also convenient to control the accuracy of the axial distance H.

[0036] Define the outer diameter of the bearing 34, that is, the outer diameter of the bearing outer ring 342 as D2, and define the inner diameter of the radial limit portion 531 as D1, then the aforementioned unilateral clearance A = (D1-D2)÷2, so that the size of the unilateral clearance A is easy to calculate, and it is also convenient to control the accuracy of the unilateral clearance A.

[0037] Due to the structure and size design of the bearing seat 34, when the rotor component 30 moves axially relative to the valve body component 10, the rotor component 30 drives the screw component, and the bearing 34 of the screw component drives the valve core component to move axially, even if the valve core body is deflected or vibrated due to the pulsating force of the system, due to the existence of the axial distance H, the pulsating force received by the valve core body in the axial direction of the electric valve will not be transmitted to the bearing 34, let alone the screw 33. In the radial direction of the electric valve, due to the design of the unilateral gap A, the pulsating force received by the valve core body will not be transmitted to the bearing 34, let alone the screw 33. Therefore, the transmission of the vibration of the valve core body is effectively blocked, the screw 34 is effectively protected, and the service life cycle of the bearing 34 can also be effectively improved.

[0038] The following is an example of the specific structural details of the valve core components. Figure 1 and Figure 2 and Figure 5D As shown, the valve core 51 of the valve core body is fixedly connected to the valve sleeve 52 of the valve core body. The valve core 51 is roughly axially through cylindrical, and the valve sleeve 52 is axially through cylindrical when used as a part. The valve core 51 and the valve core sleeve 52 are fixed by laser welding or argon arc welding.

[0039] The lower end of the valve core 51 can abut against or separate from the sealing portion 231 of the first sealing component 23 to close or open the electric valve. It includes an axial passage 5111 of the valve core body that penetrates axially. When the electric valve is in an open state, the first connecting pipe 14 and the second connecting pipe 25 are connected through the axial passage 5111 of the valve core body and the valve port 100 on the inner sleeve 24 of the electric valve. When the valve core 51 abuts against the sealing portion 231, the second connecting pipe 25, the valve port 100, the axial passage 5111 of the valve core body, the bearing seat through hole 530 and the valve sleeve through hole 5301 are connected.

[0040] The valve core 51 is roughly cylindrical with a thick wall in the middle and thin walls at both ends. The valve core 51 includes a first thin-walled portion 511, a base 510 and a second thin-walled portion 512. The first thin-walled portion 511 and the second thin-walled portion 512 are respectively located on the upper side and the lower side of the base 510. The inner diameter and the outer diameter of the base 510 are roughly equal diameters, and the inner diameter of the base 510 is smaller than the inner diameters of the first thin-walled portion 511 and the second thin-walled portion 513. The upper end surface of the base 510 serves as a support portion 5101. The base 510 itself forms a support portion 5101 for the filter component 55 to be located, and there is no need to set other parts to support the filter component 55, thereby minimizing the number of parts and saving assembly and product costs. It can be understood that when the electric valve has no filter component, the elastic member 54 can also be supported on the support portion 5101.

[0041] like Figure 2 As shown, the valve sleeve 52 specifically includes a sliding fitting portion 521, an annular side convex portion 522 and a downward extending portion 523. The downward extending portion 523 of the valve sleeve 52 extends into the first thin-walled portion 511 of the valve core 51, and the lower end surface of the side convex portion 522 is seated on the upper end surface of the first thin-walled portion 511, and the side convex portion 522 performs axial positioning on the valve core 51. The outer wall of the downward extending portion 523 and the outer wall of the first thin-walled portion 511 can be interference-fitted for pre-positioning before welding, which is convenient for subsequent welding and fixing.

[0042] The valve sleeve 52 further includes an annular upper stopper 520 extending from the upper end of the sliding fitting portion 521 toward the central axis direction of the valve sleeve 52. The upper stopper 520 has a valve sleeve through hole 5200, and the screw rod 33 passes through the valve sleeve through hole 5200. The inner diameter of the valve sleeve through hole 5200 is smaller than the outer diameter of the bearing 34. The upper end of the bearing seat 53 abuts against the upper stopper 520, and the lower end of the bearing seat 53 abuts against the elastic member 54. The upper stopper 520 restricts the bearing seat 53 and the bearing 34 from escaping from the screw rod valve core component 50. In order to improve the reliability and stability of the electric valve, in this embodiment, the elastic member 54 can specifically use a compression spring.

[0043] Specifically, Figure 5A , Figure 5BAs shown, the screw rod 33 includes a through portion 335 matched with the valve sleeve through hole 5200 and a sleeve connection portion 336 located below the through portion 335. In this embodiment, the through portion 335 is cylindrical, the sleeve connection portion 336 is cylindrical, the sleeve connection portion 336 is in a clearance match with the inner wall of the bearing, and the lower end of the sleeve connection portion 336 is riveted and fixed to the bearing 34. The outer wall of the through portion 335 is in a clearance match with the valve sleeve through hole 5200, and the inner diameter of the valve sleeve through hole 5200 is defined as D3. The inner diameter D3 of the valve sleeve through hole 5200 is smaller than the outer diameter of the bearing outer ring 342. The outer diameter of the through portion 335 is defined as D4, and the unilateral clearance between the through portion 335 and the hole wall of the valve sleeve through hole 5200 is defined as B, then B=(D3-D4)÷2, then B>A, so that the bearing seat 53 and the aforementioned unilateral clearance A and axial distance B can play their corresponding functions.

[0044] It should be noted here that in the present embodiment, the upper stop 520 is a part of the valve sleeve 52, that is, the upper stop 520 and the other parts of the valve sleeve 52 are an integral structure. It can be understood that the upper stop 520 can also be a separate part, which is connected to the valve sleeve 52 and can also realize the function of the upper stop 520 in the aforementioned embodiment. At this time, the part is also a component of the valve sleeve 52 described in this article.

[0045] The screw valve core component 50 can move axially relative to the nut 41 under the action of the rotor component. Figure 1 , Figure 2 As shown, the nut 41 includes a guide hole section 411 that provides a partial space for the axial movement of the screw valve core component 50, and the valve sleeve 52 is at least partially located in the guide hole section 411. Since the cylindrical valve core 51 and the cylindrical valve sleeve 52 are fixedly connected, the axial length formed is relatively long, in order to ensure the coaxiality of the valve core component relative to the valve body component in the axial direction, as shown in FIG. Figure 2 As shown, the outer wall of the sliding fitting portion 521 of the valve sleeve 52 can be slidably fitted with the inner wall clearance of the guide hole section 411. The guide hole section 411 of the nut 41 provides a moving stroke space for the axial movement of the screw valve core component 50, and provides a guide for the axial movement of the screw valve core component 50, which is beneficial to improve the axial deviation and tilting of the screw valve core component 50 relative to the electric valve, and is beneficial to the valve closing reliability of the valve core 51.

[0046] like Figure 1 and Figure 2As shown, the filter component 55 includes a bowl-shaped filter 551 and a fixing ring 552. The filter 551 is fixedly connected to the fixing ring 552, and the fixing ring 552 is axially limited between the valve core 51 and the valve sleeve 52. The elastic member 54 is sleeved on the outer periphery of the filter 551, and the lower end of the elastic member 54 abuts against the fixing ring 552. The fixing ring 552 is located on the support portion 5101 and is limited between the support portion 5101 and the lower end of the lower extension of the valve sleeve 52. The installation of the filter component 55 is reliable. The elastic member 54 indirectly abuts against the valve core 51 through the fixing ring 552, so that the elastic force of the elastic member 54 can act on the valve core 51. When the filter component 55 is not provided, the elastic member 54 can also directly abut against the valve core 51. That is, one end of the elastic member 54 abuts against the bearing seat 53, and the other end of the elastic member 54 abuts against the upper end of the base 510 of the valve core 51.

[0047] like Figure 1 The electric valve further includes a second sealing component 60 disposed between the connecting sleeve 13 and the valve core 51. The second sealing component 60 is located between the inner wall of the connecting sleeve 13 and the outer wall of the valve core 51. The connecting sleeve 13 is sleeved outside the second sealing component 60. The second sealing component 60 is limitedly connected to the connecting sleeve 13. The "limited" here means that the second sealing component 60 does not fall out of the connecting sleeve 13 in the axial direction. The valve core 51 and the second sealing component 60 are in sliding cooperation, and the second sealing component 60 also plays an axial guiding role for the valve core 51.

[0048] The electric valve of the above scheme, by setting the bearing seat 53, places the bearing 34 in the bearing seat 53, and by setting the unilateral gap A and the axial distance H, improves or even eliminates the vibration of the screw rod 33 caused by the high-frequency pulsation in the system, plays a vibration reduction role, and effectively protects the screw rod from the impact of the system pulse force. The assembly method of the above electric valve is described in detail below. The assembly method of the electric valve is simple, and during the assembly process, the requirements for assembly accuracy are reduced, so that the assembly efficiency is improved. The assembly method of the electric valve mainly includes:

[0049] The lower valve body 12 and the connecting sleeve 13 are fixedly connected: Specifically, the lower valve body 12 and the connecting sleeve 13 can be fixedly connected by argon arc welding, laser welding or furnace welding to form a first assembly component a, and then the first assembly component a and the first connecting pipe 14 are fixed by furnace welding. Alternatively, the lower valve body 12, the connecting sleeve 13 and the first connecting pipe 14 are fixed by furnace welding, which is more convenient and economical.

[0050] Assemble the rotor component b: fix the rotor 31 and the fixing frame 32 together by injection molding to form the rotor component b.

[0051] Assemble the nut component c to fix the nut 41 with the connecting frame 42. Specifically, the nut 41 and the connecting frame 42 can be fixedly connected together by injection molding.

[0052] Assemble the screw rod components: Assemble the screw rod 33 and the bearing 34. Sleeve the bearing 34 on the lower part of the screw rod 33, and fix the inner wall of the bearing 34 (the inner ring of the bearing in this embodiment) with the lower end of the screw rod 33 by riveting. The lower end of the screw rod 33 can also be fixed to the inner ring of the bearing 341 by welding, or by other methods, as long as the inner ring of the bearing 341 and the screw rod 33 can move synchronously.

[0053] Assemble the screw valve core parts: Figure 5A-5D As shown, a bearing seat 53 is provided, and the screw rod 33 of the screw rod component is passed through the valve sleeve through hole 520 of the valve sleeve 52, so that the valve sleeve 52 is covered with the screw rod 33, and then the bearing seat 53 is extended into the valve sleeve 52 and covered with the bearing 34, and then the elastic member 54 and the filter component 55 are installed, and then the valve core 51 and the valve sleeve 52 are press-fitted.

[0054] The second sealing component 60 is sleeved on the outer periphery of the valve core screw rod component to form a first pre-installed component.

[0055] Assemble the valve seat component 20. Weld the valve seat body 21 and the second connecting pipe 25, and specifically, the two can be fixed by furnace welding. Then, connect the first sealing component 23 and the inner sleeve 24 to the valve seat body 21. Then place the lower end face of the pressure ring 22 toward the valve seat body 21 and the first sealing component 23, and rivet the upper end of the valve seat body 21 and the pressure ring 22.

[0056] The lower end of the first pre-assembled component is extended into the first assembly component a from the upper end of the first assembly component a, and the lower end of the connecting sleeve 13 of the first assembly component a is riveted to the lower stopper 64 of the second sealing component 60. The lower end of the connecting sleeve 13 can also be welded to the lower stopper 64 if feasible.

[0057] The lower valve body 12 and the valve seat body 21 are fixed by welding.

[0058] The connecting frame 42 of the nut component c is welded and fixed to the connecting sleeve 13. Specifically, the connecting frame 42 of the nut component c and the connecting sleeve 13 are pre-positioned first, and then the connecting frame 42 and the connecting sleeve 13 are welded and fixed. The connecting frame 42 and the connecting sleeve 13 can be welded and fixed by laser welding or argon arc welding.

[0059] The fixing frame 32 and the screw rod 33 in the rotor component are fixed by welding.

[0060] The upper valve body 11 is fixedly welded to the connecting sleeve 13. Specifically, the upper valve body 11 is seated on the connecting sleeve 13, and the upper valve body 11 and the connecting sleeve 13 are fixedly welded by laser.

[0061] The above is an example of the electric valve provided by the present application. This article uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. An electric valve, comprising a nut component and a screw valve core component, the nut component comprising a nut, the screw valve core component comprising a screw component and a valve core component, the screw component comprising a screw and a bearing, the screw is threadedly connected to the nut, the bearing is sleeved on the outer periphery of the screw, the bearing is connected to the screw, the screw component can drive the valve core component to move axially, the valve core component comprises a valve core body, a bearing seat and an elastic member, the valve core body comprises an upper stopper, the bearing seat and the elastic member are located in the inner cavity of the valve core body, the elastic member supports the bearing seat, one end of the elastic member abuts against the bearing seat, the other end of the elastic member abuts against the valve core body, and in the axial direction of the electric valve, the bearing seat abuts against the upper stopper; The bearing seat includes a radial limiting portion and an axial limiting portion. The outer wall of the bearing is located between the upper stop portion and the axial limiting portion. The outer wall of the bearing is clearance-matched with the radial limiting portion. In the axial direction of the electric valve, the height of the outer wall of the bearing is less than the height of the radial limiting portion.

2. The electric valve according to claim 1, characterized in that: The radial limiting portion is cylindrical, the axial limiting portion is annular and extends from the lower end of the radial limiting portion to the central axial direction of the radial limiting portion, the bearing is located in the radial limiting portion, the inner diameter of the radial limiting portion is defined as D1, the outer diameter of the bearing is defined as D2, the height of the radial limiting portion is defined as h1, the height of the outer wall of the bearing is defined as h2, H=h1-h2, A=(D1-D2)÷2, then 0.02mm≤H≤1.5mm, 0.05mm≤A≤5mm.

3. The electric valve according to claim 1 or 2, characterized in that: The nut includes a guide hole section, the valve core body is cylindrical, the valve core body includes a sliding fitting portion, the outer wall of the sliding fitting portion is slidingly fitted with the inner wall clearance of the guide hole section, the valve core body includes the upper stopper portion, the upper stopper portion is annular from the upper end of the sliding fitting portion to the central axis direction of the sliding fitting portion, the upper stopper portion includes a valve sleeve through hole, the screw rod passes through the valve sleeve through hole, and the outer diameter of the valve sleeve through hole is smaller than the outer diameter of the bearing.

4. The electric valve according to claim 3, characterized in that: The bearing is a ball bearing, which includes a bearing inner ring, a bearing outer ring and a ball located between the bearing inner ring and the bearing outer ring. The bearing inner ring is fixedly connected to the screw rod, and the bearing outer ring is located between the upper stop portion of the valve core body and the axial limit portion of the bearing seat.

5. The electric valve according to claim 4, characterized in that: The screw rod includes a through-portion and a sleeve portion located below the through-portion, the through-portion is cylindrical, the sleeve portion is cylindrical, the outer wall of the sleeve portion is clearance matched with the inner wall of the bearing inner ring, the lower end of the sleeve portion is riveted and fixed to the bearing inner ring, the outer wall of the through-portion is clearance matched with the valve sleeve through-hole, the inner diameter of the through-hole is defined as D3, the outer diameter of the through-portion is defined as D4, and the single-sided clearance between the through-portion and the hole wall of the valve sleeve through-hole is defined as B, then D3>D2, B=(D3-D4)÷2, B>A.

6. The electric valve according to claim 3, characterized in that: The valve core body includes a valve core and a valve core sleeve, the valve core is cylindrical, the valve sleeve is cylindrical, the valve core is fixedly connected to the valve sleeve, the valve sleeve includes the upper stopper, the valve core includes a first thin-walled portion, a second thin-walled portion and a base located between the first thin-walled portion and the second thin-walled portion, the inner diameter of the base is smaller than the inner diameter of the first thin-walled portion, the inner diameter of the base is smaller than the inner diameter of the second thin-walled portion, and the lower end of the elastic member abuts against the base.

7. The electric valve according to claim 3, characterized in that: The valve core component also includes a filter component, the valve core body includes a valve core and a valve core sleeve, the valve core is cylindrical, the valve sleeve is cylindrical, the valve core is fixedly connected to the valve sleeve, the valve sleeve includes the upper stopper, the valve core includes a first thin-walled portion, a second thin-walled portion and a base located between the first thin-walled portion and the second thin-walled portion, the inner diameter of the base is smaller than the inner diameter of the first thin-walled portion, the inner diameter of the base is smaller than the inner diameter of the second thin-walled portion, the filter component is located on the base, the elastic member is a compression spring, and the lower end of the elastic member abuts against the filter component.

8. The electric valve according to claim 6, characterized in that: The electric valve also includes a valve seat component, a first connecting pipe and a second connecting pipe. The valve seat component includes a sealing portion and a valve port. The valve core can abut against or separate from the sealing portion. When the valve core is separated from the sealing portion, the first connecting pipe is communicated with the second connecting pipe. The bearing seat includes a bearing seat through hole. The valve core body includes a valve core body axial channel. When the valve core abuts against the sealing portion, the second connecting pipe, the valve port, the valve core body axial channel, the bearing seat through hole and the valve sleeve through hole are communicated.

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