An electrically operated valve

Abstract

The application discloses an electric valve, which comprises a valve body component, a nut component and a valve rod component, the valve body component is fixedly connected with the nut component, the valve rod component comprises a screw rod, a valve rod and a silencer, the screw rod is threadedly connected with the nut component, the screw rod is connected with the valve rod, the valve rod comprises a throttling channel, the flow area of the throttling channel is smaller than the flow area of a valve port, the silencer is at least partially located in the throttling channel, the valve rod is fixedly connected or limitingly connected with the silencer; when the valve rod abuts against a valve port part forming the valve port, a first fluid port and a second fluid port are communicated through the throttling channel. In the application, the screw rod is connected with the valve rod, the screw rod is threadedly connected with the nut component, the screw rod can drive the valve rod to move downward by rotating relative to the nut component, so that the valve rod can abut against the valve port part, the moving speed of the screw rod relative to the static iron core in the background art is slowed down, the kinetic energy of the impact between the valve rod and the valve port part is weakened, and the impact sound of the two is reduced.

Description

Technical Field

[0001] This utility model relates to the field of valve technology for refrigeration systems, and specifically to an electric valve. Background Technology

[0002] Figure 1 This is a cross-sectional schematic diagram of a dehumidifying solenoid valve, used in refrigeration cycle systems. When the refrigeration equipment needs to operate in dehumidification mode, a valve such as... Figure 1 The dehumidifying solenoid valve shown includes a valve body 01 and a coil 02. The coil 02 is fitted over the valve body 01. The valve body 01 includes a stationary iron core 011, a moving iron core 012, a valve core assembly 013, an inlet end 014, and an outlet end 015. The valve core assembly 013 includes a muffler 0131. When the dehumidifying solenoid valve is in the closed state (the moving iron core 012 and the stationary iron core 011 are attracted), fluid flows in from the inlet end 014, passes through the valve chamber 010 and the muffler 0131, and flows out from the outlet end 015. In this dehumidifying solenoid valve structure, during each closing process, when the moving iron core 012 and the stationary iron core 011 are attracted, the relatively fast movement speed of the moving iron core 012 causes an impact noise, thus affecting the user's comfort. Utility Model Content

[0003] The purpose of this application is to provide an electric valve, including a valve body component, a nut component, and a valve stem component. The valve body component is fixedly connected to the nut component. The valve body component includes a first fluid port, a second fluid port, and a valve orifice. The valve stem component includes a lead screw, a valve stem, and a muffler. The lead screw is threadedly connected to the nut component and connected to the valve stem. The valve stem includes a throttling channel with a flow area smaller than the flow area of ​​the valve orifice. The muffler is at least partially located in the throttling channel. The valve stem is fixedly connected to or limited by the muffler. When the valve stem abuts against the valve orifice forming the valve orifice, the first fluid port and the second fluid port are connected through the throttling channel.

[0004] In this application, the lead screw is connected to the valve stem and threadedly connected to the nut component. The valve stem can be moved downward by the rotation of the lead screw relative to the nut component so that the valve stem can abut against the valve port. The speed at which the lead screw moves up and down is slower than that of the stationary iron core in the prior art, which reduces the kinetic energy of the valve stem impacting the valve port and thus reduces the impact noise. Attached Figure Description

[0005] Figure 1 The diagram shown is a cross-sectional schematic of a dehumidifying solenoid valve.

[0006] Figure 2 The diagram shown is a diagram of the closed state of the electric valve provided in this application.

[0007] Figure 3 As shown Figure 2 Enlarged view of point K1;

[0008] Figure 4 As shown Figure 3 Enlarged view of point K2;

[0009] Figure 5 As shown Figure 2 A cross-sectional view of the main body of the central rod;

[0010] Figure 6a As shown Figure 2 A schematic diagram of the three-dimensional structure of the core;

[0011] Figure 6b As shown Figure 2 Cross-sectional schematic diagram of the core;

[0012] Figure 7a As shown Figure 2 A three-dimensional structural diagram of the first porous component in the middle;

[0013] Figure 7b As shown Figure 2 A three-dimensional structural diagram of the second porous component;

[0014] Figure 8 As shown Figure 2 Cross-sectional view of the connecting component;

[0015] Figure 9 The diagram shown is of the fully open state of the electric valve provided in this application;

[0016] Figure 10a The diagram shown is a closed state diagram of another electric valve provided in this application.

[0017] Figure 10b As shown Figure 10a Diagram of the fully open state of the electric valve;

[0018] Figure 11 As shown Figure 10a Enlarged view of point K3;

[0019] Figure 12 As shown Figure 10a A schematic diagram showing the fit between the internal and external threaded portions;

[0020] Figure 13 The figure shown is a cross-sectional schematic diagram of the third type of electric valve provided in this application;

[0021] Figure 14 As shown Figure 13 Enlarged view of point K4;

[0022] Figure 15 The figure shown is a cross-sectional schematic diagram of the fourth type of electric valve provided in this application;

[0023] Figure 16 As shown Figure 15 Enlarged diagram of point K5 in the middle.

[0024] In the picture:

[0025] 1 / 1A / 1C, Valve body component; 10, Valve cavity; 101, Upper cavity; 102, Lower cavity; 11, Valve body; 110, Side port; 12 / 12C, Valve seat; 120, Valve port; 121, Valve port portion; 122, Valve seat step portion; 123C, Riveting portion; 124C, Mounting groove; 13, Sleeve; 14 / 14A, Connector; 141, Second outer step portion; 142, Third outer step portion; 143, Fourth outer step portion; 144 / 144A, Second inner step portion; 145A, Shielding portion; 15, Support component; 16, Horizontal connecting pipe; 160, First fluid port; 17, Vertical connecting pipe; 170, Second fluid port; 18, Sealing gasket;

[0026] 2 / 2B, Nut assembly; 20, Inner cavity; 21, Nut; 211, Internal thread; 212, Thread groove; 22, Connecting piece; 220, Balance channel; 23, Spring seat;

[0027] 3. Lead screw; 31. External thread section;

[0028] 4. Valve stem; 40. Throttling channel; 41 / 41B / 41C. Stem body; 411. Receiving cavity; 412. Connecting hole; 413. Lower protrusion; 414. Riveting part; 415. Sleeve part; 4150. Mounting cavity; 4151. First inner step part; 416. First outer step part; 4161. Step surface of the first outer step part; 417B. Annular groove; 418C. Annular protrusion; 42. Core; 421. Flat plate part; 4210. Throttling channel; 422. Upper annular part; 4220. Upper concave cavity; 423. Lower annular part; 4230. Lower concave cavity;

[0029] 5. Silencing component; 51. First porous component; 52. Second porous component;

[0030] 61. First elastic element; 62. Second elastic element;

[0031] 7. Bearing components; 71. Inner ring; 72. Outer ring;

[0032] 8. Gaskets;

[0033] 9. Rotor components. Detailed Implementation

[0034] The embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the scope of the present invention.

[0035] Figure 2 The diagram shown is a diagram of the closed state of the electric valve provided in this application. Figure 3 As shown Figure 2 Enlarged view of point K1; Figure 4 As shown Figure 3 Enlarged view of point K2; Figure 5 As shown Figure 2 A cross-sectional view of the main body of the central rod; Figure 6a As shown Figure 2 A schematic diagram of the three-dimensional structure of the core; Figure 6b As shown Figure 2 Cross-sectional schematic diagram of the core; Figure 7a As shown Figure 2 A three-dimensional structural diagram of the first porous component in the middle; Figure 7b As shown Figure 2 A three-dimensional structural diagram of the second porous component; Figure 8 As shown Figure 2 Cross-sectional view of the connecting component; Figure 9 The diagram shown is of the fully open state of the electric valve provided in this application;

[0036] The electric valve provided in this application includes a valve body component 1, a nut component 2, and a valve stem component.

[0037] Valve body component 1 includes a valve body 11, a valve seat 12, a sleeve 13, a connector 14, a support 16, a horizontal connecting pipe 16, and a vertical connecting pipe 17. The valve body 11 is tubular, with a side opening 110 on its peripheral wall. The horizontal connecting pipe 16 is inserted into this side opening 110 and welded to the valve body 11. The horizontal connecting pipe 16 includes a first fluid port 160. The valve seat 12 includes a valve port portion 121 and a valve seat stepped portion 122. The valve port portion 121 forms a valve port 120. The valve seat 12 is welded to the vertical connecting pipe 17, which includes a second fluid port 170. The connector 14 includes a second outer step portion 141, a third outer step portion 142, and a fourth outer step portion 143. The second outer step portion 141 is located inside the third outer step portion 142. A sleeve 13 is placed in the second outer step portion 141 and is welded to the connector 14. A support member 16 is placed in the third outer step portion 142 and is welded to the connector 14. The support member 16 is used to support the coil. The stepped surface of the fourth outer step portion 143 faces the valve seat 12. The upper end of the valve body 11 is placed in the fourth outer step portion 143 and is welded to the connector 14. The lower end of the valve body 11 is placed in the valve seat step portion 122 and is welded to the valve seat 12.

[0038] The nut component 2 includes a nut 21 and a connecting piece 22, which are fixedly connected. Specifically, the connecting piece 22 is made of metal, and the nut 21 is made of plastic. During injection molding of the nut 21, the connecting piece 22 is integrally injection molded with the nut 21 as an insert. The nut 21 is threadedly connected to the lead screw 3 described below. The connecting member 14 also includes a second inner step portion 144, and the connecting piece 22 is placed in the second inner step portion 144. The connecting piece 22 is welded and fixed to the connecting member 14, that is, the nut component 2 is fixed to the connecting member 14 through the connecting piece 22. The connecting piece 22 includes a longitudinally penetrating balance channel 220 in the electric valve. The valve chamber 10 of the electric valve includes an upper chamber 101 located above the connecting piece 22 and a lower chamber 102 located below the connecting piece 22. The electric valve also includes a rotor component 9, which is fixedly connected to the lead screw 3. The rotor component 9 is located in the upper chamber 101 and can rotate within the upper chamber 101 and move up and down with the lead screw 3. The silencing component 5 is located in the lower cavity 102. The balance channel 220 connects the upper cavity 101 and the lower cavity 102. With this arrangement, the pressure difference between the upper cavity 101 and the lower cavity 102 is reduced, so that the operating performance of the rotor component 9 will not be affected by the pressure difference.

[0039] The valve stem assembly includes a lead screw 3, a valve stem 4, and a silencer 5. The lead screw 3 is threadedly connected to a nut 21 and is connected to the valve stem 4, allowing the lead screw 3 to drive the valve stem 4 to move up and down. The valve stem 4 includes a throttling channel 40, the flow area of ​​which is smaller than the flow area of ​​the valve port 120. The silencer 5 is at least partially located in the throttling channel 40. When the valve stem 4 abuts against the valve port 121 (e.g., when...), the silencer 5 is activated. Figure 2 As shown, the first fluid port 160 and the second fluid port 170 are connected through the throttling channel 40. The valve stem 4 is fixedly connected to the muffler 5. In this embodiment, the muffler 5 is fixed to the valve stem 4 by riveting. Of course, the valve stem 4 and the muffler 5 can also be connected by a limiting connection, for example, by setting a retaining spring at the lower end of the valve stem 4 to limit the muffler 5 within the valve stem 4.

[0040] By providing a throttling channel 40 on the valve stem 4, the electric valve can function as a throttling valve when the refrigeration cycle system is in defrost mode, thus reducing pressure. The silencer 5 is positioned within the throttling channel 40, ensuring the electric valve is in the closed state (e.g., ...). Figure 2 As shown, when the fluid flows through the throttling channel 40, the silencing component 5 can reduce the noise of the fluid, thereby reducing the working noise of the electric valve and improving the user's comfort.

[0041] On the other hand, in the above solution, the lead screw 3 is connected to the valve stem 4, and the lead screw 3 is threadedly connected to the nut component 2. The rotation of the lead screw 3 relative to the nut component 2 can drive the valve stem 4 to move downward so that the valve stem 4 can abut against the valve port 121. In this solution, the speed at which the lead screw 3 moves up and down is slower than that of the stationary iron core in the prior art, which reduces the kinetic energy of the valve stem 4 hitting the valve port 121, thereby reducing the impact noise and improving the user's comfort.

[0042] Furthermore, the valve stem 4 includes a stem body 41 and a core 42. The stem body 41 is made of copper, and the core 42 is also made of copper. The lower section of the stem body 41 includes a receiving cavity 411 with its opening facing downwards, extending to the lower end of the stem body 41. The core 42 and the muffler 5 are at least partially located within the receiving cavity 411. The stem body 41 also includes a connecting hole 412 connected to the receiving cavity 411, with one side port of the connecting hole 412 located on the outer peripheral wall of the stem body 41. The core 42 includes a throttling channel 4210, the diameter of which is smaller than the diameter of the connecting hole 412. The aforementioned throttling channel 40 includes both the connecting hole 412 and the throttling channel 4210. By setting the core 42 separately, it is easier to process the rod body 41 and the core 42 separately. On the other hand, when the flow rate of the electric valve needs to be adjusted in the closed state according to the system requirements, since the flow rate of the throttling channel 40 depends on the flow rate of the throttling orifice 4210 on the core 42, only the core 42 needs to be replaced.

[0043] Furthermore, such as Figure 6a , Figure 6b As shown, the core 42 specifically includes a flat plate portion 421, an upper annular portion 422 protruding upward relative to the flat plate portion 421, and a lower annular portion 423 protruding downward relative to the flat plate portion 421. The throttling channel 4210 is located in the flat plate portion 421, and the flat plate portion 421 and the upper annular portion 422 form an upper concave cavity 4220. Taking the plane perpendicular to the longitudinal direction of the electric valve as the projection plane, the projection of the channel wall of the throttling channel 4210 is located within the projection of the cavity wall of the upper concave cavity 4220. That is, the upper port of the throttling channel 4210 is located at the bottom of the upper concave cavity 4220, and the throttling channel 4210 connects to the upper concave cavity 4220.

[0044] And / or, the flat plate portion 421 and the lower annular portion 423 form a recessed cavity 4230. With the plane perpendicular to the longitudinal direction of the electric valve as the projection plane, the projection of the channel wall of the throttling channel 4210 is located within the projection of the cavity wall of the recessed cavity 4230. That is, the lower port of the throttling channel 4210 is located at the bottom of the recessed cavity 4230, and the throttling channel 4210 connects to the recessed cavity 4230.

[0045] In other words, the throttling channel 4210 connects the upper concave cavity 4220 and the lower concave cavity 4230. By setting the upper concave cavity 4220 and the lower concave cavity 4230, on the one hand, the area through which the fluid flows through the silencing component 5 is increased, thereby improving the noise reduction effect; on the other hand, the depth of the throttling channel 4210 is shortened, thereby reducing the processing difficulty of the core 42.

[0046] like Figure 6a As shown, the aforementioned throttling channel 4210 specifically includes three channels, which are distributed circumferentially along the core 42.

[0047] As one specific implementation method, such as Figure 3 , Figure 5 , Figure 7a As shown, the silencing component 5 includes a first porous component 51. The top of the upper annular portion 422 is serrated. The first porous component 51 is located on the upper annular portion 422 and covers the upper concave cavity 4220. The connecting hole 412 extends radially along the rod body 41. Taking the cross-section of the connecting hole 412 as the projection plane, the projection of the hole wall of the connecting hole 412 is at least partially located within the projection outline of the first porous component 51. By placing the first porous component 51 on the upper annular portion 422, since the lower part of the first porous component 51 is the upper concave cavity 4220, the area through which the fluid flows through the first porous component 51 is increased. On the other hand, by setting the first porous component 51 flush with the connecting hole 412, the outer peripheral wall of the first porous component 51 faces the connecting hole 412, and its outer peripheral wall is basically not blocked. This allows the fluid entering from the connecting hole 412 to flow directly to the first porous component 51, thereby improving the noise reduction effect.

[0048] Furthermore, the rod body 41 includes a lower protrusion 413 that protrudes toward the core 42. The cross-sectional area of ​​the lower protrusion 413 is smaller than the cross-sectional area of ​​the first porous component 51. The lower protrusion 413 abuts against the first porous component 51, and the first porous component 51 abuts against the core 42. By setting the cross-sectional area of ​​the lower protrusion 413 to be smaller than the cross-sectional area of ​​the first porous component 51, that is, the lower protrusion 413 only abuts against a portion of the upper surface of the first porous component 51, the other upper surfaces of the first porous component 51, excluding the abutting portion, can be used for fluid flow, thus improving the noise reduction effect.

[0049] like Figure 3 , Figure 5 , Figure 7bAs shown, the muffler 5 also includes a second porous component 52, which covers the recessed cavity 4230. In this embodiment, after the first porous component 51, the core 42, and the second porous component 52 are sequentially installed into the receiving cavity 411, the second porous component 52 is riveted by the riveting part 414 at the lower end of the rod body 41. The riveting makes the riveting part 414 directly support the second porous component 52. The second porous component 52 abuts against the lower annular part 423, the upper annular part 422 abuts against the first porous component 51, and the first porous component 51 abuts against the lower protrusion 413. Of course, the riveting part 414 can also indirectly support the second porous component 52 through a gasket or the like. The gasket can prevent the riveting process from damaging the second porous component 52, thus ensuring the muffler performance of the second porous component 52.

[0050] By placing the first porous component 51 and the second porous component 52 on the upper and lower sides of the core 42 respectively, that is, noise reduction treatment is carried out at both the front and rear ends of the flow through the throttling channel 4210. Whether it is forward flow (first fluid port 160 as fluid inlet and second fluid port 170 as fluid outlet) or reverse flow (first fluid port 160 as fluid outlet and second fluid port 170 as fluid inlet), the noise reduction effect can be guaranteed to reduce the working noise of the electric valve.

[0051] like Figure 3 , Figure 4 As shown, the valve stem assembly also includes a first elastic element 61 and a bearing element 7. The stem body 41 includes a sleeve portion 415, which is cylindrical and at least partially located within the inner cavity 20 of the nut assembly 2. The first elastic element 61 is specifically a spring, and the bearing element 7 is specifically a ball bearing or a needle roller bearing. The first elastic element 61 and the bearing element 7 are located in the mounting cavity 4150 of the sleeve portion 415. The bearing element 7 includes an inner ring 71 and an outer ring 72. The inner ring 71 is fixedly connected to the lead screw 3 by riveting or welding. One end of the first elastic element 61 abuts against the outer ring 72, and the other end of the first elastic element 61 abuts against the stem body 41.

[0052] The valve stem assembly also includes a gasket 8, and the sleeve portion 415 includes a first inner step portion 4151 with the stepped surface facing upward. The gasket 8 is located on the first inner step portion 4151. The sleeve portion 415 and the gasket 8 are fixedly connected by riveting or welding, and the outer ring 72 can abut against the gasket 8.

[0053] By setting the bearing component 7, the rotational motion of the lead screw 3 can be converted into the up-and-down movement of the valve stem 4. By setting the first elastic component 61, the first elastic component 61 can press the valve stem 4 towards the valve port 120, ensuring the reliability of the contact and sealing between the stem body 41 and the valve port 121 when the electric valve is closed.

[0054] like Figure 5 , Figure 9 As shown, the rod body 41 includes a first outer step portion 416 with the stepped surface facing upward. The outer peripheral wall of the sleeve portion 415 serves as the step wall of the first outer step portion 416. In the longitudinal direction of the electric valve, the step surface 4161 of the first outer step portion 416 can abut against the nut 21 to restrict the upward movement of the valve stem component. That is, the fully open position of the electric valve is determined by the lower end of the nut 21.

[0055] In electric valves of related technologies, the displacement of the valve stem component is generally limited by the cooperation of a spring guide rail and a nut. However, in this embodiment, the upward displacement of the valve stem component is limited by the cooperation of the first outer step portion 416 on the stem body 41 and the lower end of the nut 21. Compared with related technologies, the spring guide rail is eliminated, reducing the number of parts.

[0056] Figure 10a The diagram shown is a closed state diagram of another electric valve provided in this application. Figure 10b As shown Figure 10a Diagram of the fully open state of the electric valve; Figure 11 As shown Figure 10a Enlarged view of point K3; Figure 12 As shown Figure 10a A schematic diagram of the fit between the internal and external threads.

[0057] As shown in the figure, the valve stem component of this embodiment includes a stem body 41, a gasket 8, and a second elastic member 62. The stem body 41 is fixedly connected to the gasket 8. The second elastic member 62 is located in the inner cavity 20 of the nut component 2. The second elastic member 62 is fitted with a lead screw 3. One end of the second elastic member 62 abuts against the nut component 2, and the other end of the second elastic member 62 abuts against the gasket 8.

[0058] In this embodiment, as Figure 11 , Figure 12 As shown, the nut 21 includes an internal thread portion 211, and the lead screw 3 includes an external thread portion 31. To prevent the internal thread portion 211 and the external thread portion 31 from jamming when they mate, the width of the thread groove 212 of the internal thread portion 211 is often set to be relatively large, so that there is a certain amount of longitudinal clearance between the external thread portion 31 and the internal thread portion 211. However, the inventors found that when the electric valve switches from the closed state to the fully open state, due to the existence of longitudinal clearance, the lateral sway of the rotor component 9 and the lead screw 3 increases, resulting in noise.

[0059] To address this, a second elastic element 62 is provided. One end of the second elastic element 62 abuts against the nut component 2, and the other end of the second elastic element 62 abuts against the washer 8. Under the elastic force of the second elastic element 62, the valve stem component is pushed downward, which causes the external thread portion 31 of the lead screw 3 to abut against the lower edge of the thread groove 212 of the internal thread portion 211. This reduces the lateral sway amplitude of the lead screw 3, thereby reducing the noise generated by the lateral sway of the rotor component 9 and the lead screw 3.

[0060] Furthermore, such as Figure 10a , Figure 10b and Figure 11 As shown, the valve body component 1A in this embodiment includes a valve body 11, a sleeve 13, a connector 14A, and a support 15. The fixing method of the valve body 11, sleeve 13, connector 14A, and support 15 is the same as in the previous embodiment, and will not be repeated here. The connector 14A includes a second inner step portion 144A and a blocking portion 145A. The nut component 2 includes a nut 21 and a connecting piece 22, which are fixedly connected. The nut 21 is threadedly connected to the lead screw 3. The connecting piece 22 is placed in the second inner step portion 144A and is fixedly connected to the connector 14A. The valve stem component includes a stem body 41, which includes a first outer step portion 416 with the step surface facing upwards. The stem body 41 includes a connecting hole 412, which serves as part of the throttling channel 40. In the longitudinal direction of the electric valve, the lower end of the blocking portion 145A is located between the step surface 4161 of the first outer step portion 416 and the lower end of the connecting hole 412.

[0061] By providing the shielding part 145A, when the fluid flows in the forward direction (the first fluid port 160 serves as the fluid inlet and the second fluid port 170 serves as the fluid outlet), the shielding part 145A can block the impact of high-pressure fluid on the valve stem component, while not completely blocking the port of the connecting hole 412. In addition to ensuring the flow capacity of the throttling channel 40 when the electric valve is closed, it can also block the impact of high-pressure fluid on the valve stem component, thereby reducing noise caused by the shaking of the valve stem component.

[0062] Figure 13 The figure shown is a cross-sectional schematic diagram of the third type of electric valve provided in this application; Figure 14 As shown Figure 13 Enlarged schematic diagram of point K4 in the middle.

[0063] As shown in the figure, the difference between this embodiment and the above embodiments includes the location of the second elastic element. Specifically, the valve stem component includes a second elastic element 62 and a stem body 41B. The second elastic element 62 is at least partially located in the inner cavity 20 of the nut component 2. The stem body 41B includes a sleeve portion 415, and the second elastic element 62 is fitted with the sleeve portion 415. One end of the second elastic element 62 abuts against the nut component 2, and the other end of the second elastic element 62 abuts against the stem body 41B. The beneficial effects of providing the second elastic element 62 are the same as in the above embodiments, and will not be repeated here.

[0064] In this embodiment, the nut component 2B includes a nut 21 and a spring seat 23. The nut 21 is made of plastic, and the spring seat 23 is made of metal. The rod body 41B includes an annular groove 417B, with the opening of the annular groove 417B facing the spring seat 23. One end of the second elastic member 62 abuts against the spring seat 23, and the spring seat 23 abuts against the nut 21. The other end of the second elastic member 62 abuts against the bottom of the annular groove 417B. By providing a metal spring seat 23, wear on the nut 21 during the extension and retraction of the second elastic member 62 can be reduced, improving the reliability of the nut 21. By providing the annular groove 417B, the lower end of the second elastic member 62 is located in the annular groove 417B. The annular groove 417B can radially limit the second elastic member 62, thereby limiting the lateral displacement of the second elastic member 62 during the extension and retraction process and ensuring the reliability of the second elastic member 62.

[0065] Figure 15 The figure shown is a cross-sectional schematic diagram of the fourth type of electric valve provided in this application; Figure 16 As shown Figure 13 Enlarged diagram of point K5 in the middle.

[0066] As shown in the figure, valve body component 1C includes valve seat 12C and sealing gasket 18. Valve seat 12C includes a riveting part 123C and a mounting groove 124C. Sealing gasket 18 is made of non-metallic material. During assembly, sealing gasket 18 is placed in the mounting groove 124C, and valve seat 12C and sealing gasket 18 are riveted and fixed by riveting part 123C. Rod body 41C includes an annular protrusion 418C, which protrudes toward sealing gasket 18 and can abut against sealing gasket 18. Figure 16 The diagram shows the resisting state, where the electric valve is in the closed state. Through the above settings, on the one hand, the sealing performance of the electric valve when closed can be improved; on the other hand, since the sealing gasket 18 is made of non-metallic materials, such as rubber or PTFE (polytetrafluoroethylene), the collision between metal and non-metal is quieter than the collision between metal and metal, thus reducing the operating noise of the electric valve.

[0067] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above examples illustrate the principles and implementation methods of this utility model. The descriptions of these embodiments are merely for the purpose of helping to understand the technical solution and core ideas of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. An electric valve, characterized in that, The device includes a valve body assembly, a nut assembly, and a valve stem assembly. The valve body assembly is fixedly connected to the nut assembly. The valve body assembly includes a first fluid port, a second fluid port, and a valve port. The valve stem assembly includes a lead screw, a valve stem, and a silencer. The lead screw is threadedly connected to the nut assembly and to the valve stem. The valve stem includes a throttling channel with a flow area smaller than that of the valve port. The silencer is at least partially located in the throttling channel. The valve stem is fixedly connected to or limited by the silencer. When the valve stem abuts against the valve port portion forming the valve port, the first fluid port and the second fluid port are connected through the throttling channel.

2. The electric valve according to claim 1, characterized in that, The valve stem includes a stem body and a core. The stem body includes a receiving cavity extending to the lower end of the stem body. The core and the muffler are at least partially located in the receiving cavity. The stem body also includes a connecting hole connected to the receiving cavity. The core includes a throttling channel with a flow area smaller than that of the connecting hole. The throttling channel includes the connecting hole and the throttling channel.

3. The electric valve according to claim 2, characterized in that, The core includes a flat plate portion, an upper annular portion protruding upward relative to the flat plate portion, and a lower annular portion protruding downward relative to the flat plate portion. The throttling channel is located in the flat plate portion. The flat plate portion and the upper annular portion form an upper concave cavity. With the plane perpendicular to the longitudinal direction of the electric valve as the projection plane, the projection of the channel wall of the throttling channel is located within the projection of the cavity wall of the upper concave cavity. The throttling channel communicates with the upper concave cavity. And / or, the flat plate portion and the lower annular portion form a recessed cavity, with the plane perpendicular to the longitudinal direction of the electric valve as the projection plane, the projection of the channel wall of the throttling channel is located within the projection of the cavity wall of the recessed cavity, and the throttling channel communicates with the recessed cavity.

4. The electric valve according to claim 3, characterized in that, The noise-absorbing component includes a first porous component. The top of the upper annular portion is serrated. The first porous component is located on the upper annular portion and covers the upper cavity. The connecting hole extends radially along the rod body. With the cross-section of the connecting hole as the projection plane, the projection of the hole wall of the connecting hole is at least partially located within the projection outline of the first porous component.

5. The electric valve according to claim 4, characterized in that, The rod body includes a lower protrusion that protrudes toward the core. The cross-sectional area of ​​the lower protrusion is smaller than the cross-sectional area of ​​the first porous component. The lower protrusion abuts against the first porous component, and the first porous component abuts against the core.

6. The electric valve according to claim 3, characterized in that, The silencing component includes a second porous component that covers the recessed cavity. The rod body includes a riveting part that directly or indirectly supports the second porous component, and the second porous component abuts against the lower annular portion.

7. The electric valve according to any one of claims 1-6, characterized in that, The valve stem component includes a stem body, a first elastic element, and a bearing component. The stem body includes a sleeve portion, which is at least partially located in the inner cavity of the nut component. The first elastic element and the bearing component are located in the mounting cavity of the sleeve portion. One end of the first elastic element abuts against the bearing component, and the other end of the first elastic element abuts against the stem body. The rod body includes a receiving cavity extending to the lower end of the rod body, and the silencing element is at least partially located in the receiving cavity.

8. The electric valve according to claim 7, characterized in that, The rod body includes a first outer step portion with the stepped surface facing upwards, the outer peripheral wall of the sleeve portion serves as the step wall of the first outer step portion, and the nut component includes a nut. In the longitudinal direction of the electric valve, the stepped surface of the first outer step portion can abut against the nut to restrict the upward movement of the valve rod component.

9. The electric valve according to claim 7, characterized in that, The bearing component includes an inner ring and an outer ring. The inner ring is fixedly connected to the lead screw, and one end of the first elastic element abuts against the outer ring. The valve stem component also includes a gasket. The sleeve portion includes a first inner step portion with the stepped surface facing upward. The gasket is located in the first inner step portion. The sleeve portion is fixedly connected to the gasket, and the outer ring can abut against the gasket.

10. The electric valve according to any one of claims 1-6, characterized in that, The valve stem component includes a second elastic element located inside the nut component. The second elastic element is fitted over the lead screw. One end of the second elastic element abuts against the nut component, and the other end of the second elastic element abuts against the valve stem component.

11. The electric valve according to claim 10, characterized in that, The valve stem component includes a stem body and a gasket. The stem body includes a sleeve portion, which is at least partially located in the inner cavity of the nut component. The sleeve portion includes a first inner step portion with the stepped surface facing upward. The gasket is located in the first inner step portion. The sleeve portion is fixedly connected to the gasket. One end of the second elastic member abuts against the nut component, and the other end of the second elastic member abuts against the gasket.

12. The electric valve according to any one of claims 1-6, characterized in that, The valve stem component includes a second elastic element and a stem body. The second elastic element is at least partially located in the inner cavity of the nut component. The stem body includes a sleeve portion. The second elastic element is sleeved over the sleeve portion. One end of the second elastic element abuts against the nut component, and the other end of the second elastic element abuts against the stem body.

13. The electric valve according to claim 12, characterized in that, The nut component includes a nut and a spring seat. The rod body includes an annular groove with the opening of the annular groove facing the spring seat. One end of the second elastic member abuts against the spring seat, the spring seat abuts against the nut, and the other end of the second elastic member abuts against the bottom of the annular groove.

14. The electric valve according to claim 12, characterized in that, The valve body component includes a valve seat and a sealing gasket. The valve seat includes a mounting groove, and the sealing gasket is placed in the mounting groove. The valve seat and the sealing gasket are riveted together. The rod body includes an annular protrusion that protrudes toward the sealing gasket and can abut against the sealing gasket.

15. The electric valve according to any one of claims 1-6, characterized in that, The valve body component includes a valve body, a valve seat, a sleeve, a connector, and a support. The valve body is tubular. The valve seat includes a stepped portion. The connector includes a second outer stepped portion, a third outer stepped portion, and a fourth outer stepped portion. The second outer stepped portion is located inside the third outer stepped portion. The sleeve is placed on the second outer stepped portion and is fixedly connected to the connector. The support is placed on the third outer stepped portion and is fixedly connected to the connector. The stepped surface of the fourth outer stepped portion faces the valve seat. The upper end of the valve body is placed on the fourth outer stepped portion and is fixedly connected to the connector. The lower end of the valve body is placed on the stepped portion of the valve seat and is fixedly connected to the valve seat. The connector further includes a second inner step portion. The nut component includes a nut and a connecting piece. The nut is made of plastic. The nut and the connecting piece are fixedly connected. The nut is threadedly connected to the lead screw. The connecting piece is placed in the second inner step portion and is fixedly connected to the connector. The connecting piece includes a balance channel. The valve chamber of the electric valve includes an upper chamber located above the connecting piece and a lower chamber located below the connecting piece. The electric valve further includes a rotor component located in the upper chamber. The silencer is located in the lower chamber. The balance channel connects the upper chamber and the lower chamber.

16. The electric valve according to any one of claims 1-6, characterized in that, The valve body component includes a valve body, a sleeve, a connector, and a support. The valve body, the sleeve, the connector, and the support are fixedly connected. The connector includes a second inner step and a blocking portion. The nut component includes a nut and a connecting piece. The nut and the connecting piece are fixedly connected. The nut is threaded to the lead screw. The connecting piece is located in the second inner step and is fixedly connected to the connector. The connecting piece includes a balance channel. The valve chamber of the electric valve includes an upper chamber above the connecting piece and a lower chamber below the connecting piece. The electric valve also includes a rotor component located in the upper chamber. The silencer is located in the lower chamber. The balance channel connects the upper chamber and the lower chamber. The valve stem component includes a stem body made of copper. The stem body includes a first outer step with the stepped surface facing upwards. The stem body includes a connecting hole, which is part of the throttling channel. In the longitudinal direction of the electric valve, the lower end of the blocking portion is located between the stepped surface of the first outer step and the lower end of the connecting hole.

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