Electric valve

Abstract

The electric valve comprises a valve seat, a valve element and a transmission assembly, the valve seat is provided with a valve hole part, and the transmission assembly is connected with the valve element so as to drive the valve element to be close to or away from the valve hole part; the valve seat is further provided with a valve cavity, the electric valve comprises a guide part, the guide part is located on the periphery of the valve element, and the valve element is in sliding fit with the guide part. Therefore, due to the fact that the guide part is located on the periphery of the valve element and the valve element is in sliding fit with the guide part, namely, the guide part plays a role in limiting the valve element in the radial direction, the deviation, caused by fluid impact, of the valve element can be reduced, and the gap, caused by deviation, between the valve element and the valve hole part when the valve is closed is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of fluid control, and particularly relates to an electric valve. Background Art

[0002] In the related art, an electric valve includes a valve core and a valve seat. The valve seat is provided with a valve hole portion, and the valve core can move in the vertical direction to approach or move away from the valve hole portion;

[0003] Due to the influence of the fitting error between components and fluid impact, during the process of the valve core moving in the vertical direction, the valve core will deviate, thereby aggravating the wear between the valve core body and the valve hole portion, and there may be a gap and internal leakage when closing the valve. Summary of the Invention

[0004] To solve at least one of the above technical problems, the following technical solutions are provided:

[0005] An electric valve includes a valve seat, a valve core and a transmission assembly. The valve seat is provided with a valve hole portion, and the transmission assembly is connected to the valve core to drive the valve core to approach or move away from the valve hole portion; the valve seat also has a valve cavity. The electric valve includes a guiding portion. Along the radial direction of the valve core, the guiding portion is located on the outer periphery of the valve core, and the valve core is in sliding fit with the guiding portion.

[0006] In this way, since the guiding portion is located on the outer periphery of the valve core and the valve core is in sliding fit with the guiding portion, that is, the guiding portion plays a limiting role on the valve core in the radial direction, which is beneficial to reducing the deviation of the valve core caused by fluid impact, reducing the wear between the valve core body and the valve hole portion, and reducing the gap between the valve core and the valve hole portion when closing the valve caused by the deviation. Brief Description of the Drawings

[0007] Figure 1 is a cross-sectional schematic view of the present application;

[0008] Figure 2 is Figure 1 an enlarged schematic view of area A in

[0009] Figure 3 is a three-dimensional schematic view of the valve seat in the present application;

[0010] Figure 4 is a schematic view of the first projection and the second projection in the present application;

[0011] Figure 5 is Figure 1 a schematic view of the valve seat in

[0012] Figure 6 is a schematic view of another embodiment in the present application;

[0013] Figure 7 isFigure 5 Enlarged schematic view of the middle region B;

[0014] Figure 8 Stereo schematic view of the guide part in another embodiment of the present application;

[0015] Figure 9 Stereo schematic view of the valve seat in another embodiment of the present application;

[0016] Figure 10 Schematic view of yet another embodiment of the present application;

[0017] Figure 11 Stereo schematic view of the guide part in yet another embodiment of the present application.

[0018] Reference numerals:

[0019] 100, valve seat; 200, valve core; 300, transmission assembly; 400, valve body; 500, sealing assembly; 101, body part; 401, first accommodation channel;

[0020] 1, valve hole part; 11, valve hole channel; 2, valve cavity; 3, guide part; 31, first mating surface; 4, first channel; 5, guide part; 51, first base part; 52, second base part; 53, limiting flange part; 6, limiting groove; 600, housing; 601, first accommodation cavity; 7, first plane; 71, first projection; 72, second projection. Detailed implementation manners

[0021] The technical solutions of the detailed implementation manners will be described below in conjunction with the accompanying drawings.

[0022] As Figures 1-4 shown,

[0023] An electric valve includes a valve seat 100, a valve core 200 and a transmission assembly 300. The valve seat 100 includes a body part 101 and a valve hole part 1 (specifically as Figure 5 shown, the boundary between the body part 101 and the valve hole part 1 is indicated by a dotted line), the transmission assembly 300 is connected to the valve core 200 to drive the valve core 200 to approach or move away from the valve hole part 1; the valve seat 100 further has a valve cavity 2, the valve hole part 1 has a valve hole channel 11, and when the valve core 200 is separated from the valve hole part 1, the valve hole channel 11 communicates with the valve cavity 2; the electric valve includes a guide part 3, the guide part 3 is located on the outer periphery of the valve core 200, and the valve core 200 is slidably matched with the guide part 3.

[0024] In this way, since the guiding portion 3 is located on the outer periphery of the valve core 200, and the valve core 200 is in sliding fit with the guiding portion 3, that is, in the radial direction, the guiding portion 3 plays a limiting role on the valve core 200, which is beneficial to reducing the offset of the valve core 200 caused by fluid impact, thereby reducing the gap between the valve core 200 and the valve hole portion 1 when closing the valve due to the offset.

[0025] The guiding portion 3 has a first mating surface 31. In the radial direction of the valve core 200, the first mating surface 31 is a concave curved surface facing the valve core 200. In this embodiment, the radius corresponding to the first mating surface 31 is the same as the outer diameter of the valve core 200. It should be noted that in actual processes, due to errors or requirements caused by the processing and assembly of components, the radius corresponding to the first mating surface 31 may be greater than the outer diameter of the valve core 200, which is also within the protection scope of this solution. The number of the guiding portions 3 is at least two, and the guiding portions 3 are evenly distributed in the circumferential direction of the valve core 200.

[0026] In this way, since the first mating surface 31 is a concave curved surface facing the valve core 200, the mating area between the guiding portion 3 and the valve core 200 is ensured, the reliability of the mating between the guiding portion 3 and the valve core 200 is increased, and the offset amount of the valve core 200 when moving axially is reduced.

[0027] In some embodiments, the first mating surface 31 is a convex curved surface facing the valve core 200, and the number of the guiding portions 3 is at least three, and the guiding portions 3 are evenly distributed in the circumferential direction of the valve core 200; in still other embodiments, the first mating surface 31 is a plane facing the valve core 200, and the number of the guiding portions 3 is at least three, and the guiding portions 3 are evenly distributed in the circumferential direction of the valve core 200. The number of the guiding portions 3 is at least three to ensure the guiding effect of the guiding portion 3 on the valve core 200.

[0028] A first plane 7 is defined, and the first plane 7 is perpendicular to the axial direction of the valve core 200; the projection of the wall corresponding to the valve hole passage 11 on the first plane 7 is a first projection 71, and the projection of the guiding portion 3 on the first plane 7 is a second projection 72. The second projection 72 is distributed on the outer periphery of the first projection 71, and there is no intersection between the first projection 71 and the second projection 72.

[0029] The valve core 200 can move axially to abut against the valve hole portion 1, thereby realizing valve closing. Since there is no intersection between the first projection 71 and the second projection 72, that is, the area corresponding to the wall of the valve hole passage 11 is smaller than the area surrounded by the guiding portion 3, so that the valve core 200 can smoothly abut against the valve hole portion 1 to realize valve closing.

[0030] The valve seat 100 has at least one first channel 4. In this embodiment, the number of the first channels 4 is six, and the number of the guiding parts 1 is also six. The first channels 4 are uniformly distributed along the circumferential direction of the valve seat 100 on the side wall of the valve seat 100. The first channels 4 penetrate the side wall of the valve seat 100 in the radial direction, and the first channels 4 communicate with the valve cavity 2. In the circumferential direction of the valve seat 100, the wall corresponding to the first channel 4 is located between two adjacent guiding parts 3.

[0031] Thus, since in the circumferential direction, the wall corresponding to the first channel 4 is located between two adjacent guiding parts 3, it is avoided that the guiding parts 3 occupy the flow area corresponding to the first channel 4 and the flow resistance is increased accordingly.

[0032] Along the axial direction of the valve core 200, the minimum distance between the guiding part 3 and the valve hole part 1 is greater than zero.

[0033] Thus, that is, in the axial direction, there is a space between the guiding part 3 and the valve hole part 1, so as to avoid increasing the flow resistance due to the guiding part 3 occupying the flow area when opening the valve. Leaving a space between the guiding part 3 and the valve hole part 1 also facilitates providing space for the processing tool, so as to facilitate processing the valve hole part 1.

[0034] Along the axial direction of the valve seat 100, the minimum distance between the guiding part 3 and the valve hole part 1 is h, and the value of h is not less than 1 mm. When the valve core 200 abuts against the valve hole part 1, the length (in the axial direction) of the part of the valve core 200 located in the valve cavity 2 is l, and the value of h / l is not greater than 0.3.

[0035] In this way, the value of h is not greater than 1 mm to ensure that there is enough area between the guiding part 3 and the valve hole part 1 for the processing tool to process the valve hole part 1, and the value of h / l is not greater than 0.3, that is, the value of h is limited, so as to ensure the axial length of the guiding part 3 and further ensure the guiding effect of the guiding part 3 on the valve core 200.

[0036] The electric valve further includes a housing 600, a valve body 400 and a sealing assembly 500. The housing 600 is fixedly connected to the valve body 400, and the valve body 400 is fixedly connected to the valve seat 100. Specifically, a part of the valve body 400 is sleeved on the valve seat 100, and the valve body 400 and the valve seat 100 are fixed by welding. The housing 600 has a first accommodation cavity 601, at least part of the transmission assembly 300 is located in the first accommodation cavity 601. The valve body 400 has a first accommodation channel 401, and parts of the valve core 200 are respectively located in the first accommodation channel 401 and the valve cavity 2. The sealing assembly 500 is sleeved on the outer peripheral wall of the valve core 200. Along the radial direction of the valve core 200, the sealing assembly 500 is respectively in sealing cooperation with the valve core 200 and the valve body 400. In the axial direction of the valve core 200, at least part of the projection of the guiding part 3 is located in the sealing assembly 500, and the sealing assembly 500 is located between the valve body 400 and the guiding part 3.

[0037] In this way, since in the radial direction of the valve core 200, the sealing assembly 500 is in sealing fit with the valve core 200 and the valve body 400 respectively, the pressure balance between the area above the valve core 200 and the valve cavity 2 is avoided, so as to reduce the pressure difference between the upper and lower parts of the valve core 200, thereby reducing the difficulty of opening the valve.

[0038] The guiding part 3 and the valve seat 100 are integrally arranged or separately arranged. In this embodiment, the guiding part 3 and the valve seat 100 are integrally arranged, and the guiding part 3 protrudes from the corresponding wall of the valve cavity 2. Specifically, the guiding part 3 protrudes from the corresponding wall of the valve cavity 2 in the radial direction of the valve core 200. The processing of the valve seat 100 can be realized by 3D printing or by machining. The machining method is specifically to first machine the inner circular area corresponding to the guiding part 3 (i.e., part of the valve cavity 2) and the valve hole channel 11 along the axial direction, then machine the space between the guiding part 3 and the valve hole part 1, then machine each guiding part 3 (i.e., turn off the area between two adjacent guiding parts 3) and the valve hole part 1, and finally machine each first channel 4 on the outer peripheral wall of the valve seat 100.

[0039] Figures 5-8 Another embodiment is shown. In this embodiment,

[0040] The guiding part 3 and the valve seat 100 are separately arranged. The electric valve further includes a guiding member 5. The guiding member 5 includes a first base part 51. One end of the guiding part 3 is connected to the first base part 51. In this embodiment, the guiding part 3 and the first base part are integrally arranged. The other end of the guiding part 3 faces the corresponding bottom wall of the valve cavity 2, and a chamfer or fillet is provided on the side of the other end of the guiding part 3 close to the valve hole part 1; the inner diameter of the first base part 51 is greater than or equal to the outer diameter of the valve core 200.

[0041] In this way, the connection between the guiding part 3 and the first base part 51 can increase the structural strength and stability of the whole guiding member.

[0042] The guiding member 5 has a limiting flange portion 53 which protrudes radially of the guiding member 5 from the first base portion 51 and / or the guiding portion 3; in this embodiment, the limiting flange portion 53 protrudes radially of the guiding member 5 from the guiding portion 3. The valve seat 100 has a limiting groove 6, and the limiting groove 6 is located at one end of the valve seat 100 facing the valve body 400. The opening of the limiting groove 6 at least partially faces the valve body 400 in the axial direction. In the axial direction of the guiding member 5, at least a part of the limiting flange portion 53 is located between the corresponding bottom wall of the limiting groove 6 and the valve body 400. In this way, in the axial direction of the guiding member 5, the corresponding bottom wall of the limiting groove 6 and the valve body 400 limit the limiting flange, that is, limit the guiding member 5, so as to restrict the guiding member 5 from moving axially under the influence of the valve core 200 or the fluid. In the circumferential direction of the guiding member 5, due to the limiting effect of the limiting groove 6 on the limiting flange, the guiding member 5 is restricted from rotating in the circumferential direction under the influence of the valve core 200 or the fluid. In some embodiments, the valve body 400 has a limiting groove 6. In the axial direction of the guiding member 5, at least a part of the limiting flange portion 53 is located between the corresponding bottom wall of the limiting groove 6 and the valve seat 100. In this way, in the axial direction of the guiding member 5, the corresponding bottom wall of the limiting groove 6 and the valve seat 100 limit the limiting flange, that is, limit the guiding member 5, so as to restrict the guiding member 5 from moving axially under the influence of the valve core 200 or the fluid.

[0043] In the axial direction of the valve core 200, the sealing assembly 500 is located between the valve body 400 and the first base portion 51. The valve body 400 and the first base portion 51 limit the sealing assembly 500, so as to restrict the sealing assembly 500 from moving axially under the influence of the valve core 200, which may cause an adverse effect on the sealing.

[0044] Figures 9-10 Another embodiment is shown. In this embodiment,

[0045] The guiding member 5 has a second base portion 52. The other end of the guiding portion 3 is connected to the second base portion 52, and the inner diameter of the second base portion 52 is larger than the inner diameter of the wall corresponding to the valve hole passage 11. In this way, the connection of the other end of the guiding portion 3 to the second base portion 52 can enhance the structural strength and stability of the guiding member 5.

[0046] The valve seat 100 has at least one first channel 4 which is distributed along the circumferential direction of the valve seat 100 on the side wall of the valve seat 100, and the first channel 4 communicates with the valve cavity 2; in the axial direction, the first base portion 51 and the second base portion 52 are respectively located on both sides of the wall corresponding to the first channel 4, the second base portion 52 is located between the wall corresponding to the first channel 4 and the valve hole portion 1, and in a plane perpendicular to the center line of the first channel 4, the projection of the wall corresponding to the first channel 4 and the projection of the second base portion 52 have no intersection.

[0047] In this way, in a plane perpendicular to the center line of the first channel 4, the projection of the wall corresponding to the first channel 4 and the projection of the second base portion 52 have no intersection, thereby avoiding the second bottom wall portion from occupying the flow area of the first channel 4 and the resulting increase in flow resistance.

[0048] It should be noted that although this specification has described the present application in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the art can still modify, combine, or equivalently replace the present application, and all technical solutions and their improvements that do not depart from the spirit and scope of the present application should be covered within the scope of the claims of the present application.

Claims

1. An electric valve, comprising a valve seat (100), a valve core (200) and a transmission assembly (300). The valve seat (100) is provided with a valve hole portion (1), and the transmission assembly (300) is connected to the valve core (200) to drive the valve core (200) to approach or move away from the valve hole portion (1). Characterized in that, The valve seat (100) further has a valve cavity (2). The electric valve includes a guiding portion (3). The guiding portion (3) is located on the outer periphery of the valve core (200), and the valve core (200) is in sliding fit with the guiding portion (3).

2. The electric valve according to claim 1, Characterized in that, The guiding portion (3) and the valve seat (100) are integrally provided, and the guiding portion (3) protrudes from the corresponding wall of the valve cavity (2) in the radial direction of the valve core (200).

3. The electric valve according to claim 1, Characterized in that, The guiding portion (3) and the valve seat (100) are separately provided, and the electric valve further includes a guiding member (5); The guiding member (5) includes a first base portion. One end of the guiding portion (3) is connected to the first base portion (51); The inner diameter of the first base portion (51) is greater than or equal to the outer diameter of the valve core (200).

4. The electric valve according to claim 1 or 2 or 3, Characterized in that, The guiding portion (3) has a first mating surface (31). In the radial direction of the valve core (200), the first mating surface (31) is a concave curved surface facing the valve core (200), and the number of the guiding portions (3) is at least two, and the guiding portions (3) are evenly distributed in the circumferential direction of the valve core (200); Or the first mating surface (31) is a convex curved surface facing the valve core (200), and the number of the guiding portions (3) is at least three, and the guiding portions (3) are evenly distributed in the circumferential direction of the valve core (200); Or the first mating surface (31) is a plane facing the valve core (200), and the number of the guiding portions (3) is at least three, and the guiding portions (3) are evenly distributed in the circumferential direction of the valve core (200).

5. The electric valve according to claim 1 or 2 or 3, Characterized in that, A first plane (7) is defined, and the first plane (7) is perpendicular to the axial direction of the valve core; The valve hole portion (1) has a valve hole passage (11). When the valve core (200) is separated from the valve hole portion (1), the valve hole passage (11) communicates with the valve cavity (2). The projection of the corresponding wall of the valve hole passage (11) on the first plane (7) is a first projection (71), and the projection of the guiding portion (3) on the first plane (7) is a second projection (72). The second projection (72) is distributed on the outer periphery of the first projection (71), and there is no intersection between the first projection (71) and the second projection (72).

6. The electric valve according to claim 1 or 2 or 3, Characterized in that, The valve seat (100) has at least one first channel (4), the first channel (4) is distributed along the circumferential direction of the valve seat (100) on the side wall of the valve seat (100), the first channel (4) penetrates the side wall of the valve seat (100) in the radial direction, and the first channel (4) communicates with the valve cavity (2); In the circumferential direction of the valve seat (100), the wall corresponding to the first channel (4) is located between two adjacent guiding parts (3).

7. An electric valve according to claim 2, wherein, In the axial direction of the valve core (200), the minimum distance between the guiding part (3) and the valve hole part (1) is greater than zero.

8. An electric valve according to claim 7, wherein, In the axial direction of the valve seat (100), the minimum distance between the guiding part (3) and the valve hole part (1) is h, and the value of h is not less than 1 mm; When the valve core (200) abuts against the valve hole part (1), the length of the part of the valve core (200) located in the valve cavity (2) is l, and the value of h / l is not greater than 0.

3.

9. An electric valve according to claim 3, wherein, The guiding member (5) has a limiting flange part (53), and the limiting flange part (53) protrudes from the first base part (51) and / or the guiding part (3) in the radial direction of the guiding member (5); The valve body (400) has a limiting groove (6), at least part of the limiting flange part (53) is located in the limiting groove (6), and in the axial direction of the guiding member (5), at least part of the limiting flange part (53) is located between the bottom wall corresponding to the limiting groove (6) and the valve seat (100), or The valve seat (100) has a limiting groove (6), at least part of the limiting flange part (53) is located in the limiting groove (6), and in the axial direction of the guiding member (5), at least part of the limiting flange part (53) is located between the bottom wall corresponding to the limiting groove (6) and the valve body (400).

10. An electric valve according to claim 3, wherein, The guiding member (5) has a second base part (52), the other end of the guiding part (3) is connected to the second base part (52), The valve hole part (1) has a valve hole channel (11), when the valve core (200) is separated from the valve hole part (1), the valve hole channel (11) communicates with the valve cavity (2), and the inner diameter of the second base part (52) is greater than the inner diameter of the wall corresponding to the valve hole channel (11).

11. An electric valve according to claim 3, wherein, The valve seat (100) has at least one first channel (4), the first channel (4) is distributed along the circumferential direction of the valve seat (100) on the side wall of the valve seat (100), and the first channel (4) communicates with the valve cavity (2); In the axial direction, the first base portion (51) and the second base portion (52) are respectively located on both sides of the wall corresponding to the first channel (4), the second base portion (52) is located between the wall corresponding to the first channel (4) and the valve hole portion (1), and in a plane perpendicular to the center line of the first channel (4), the projection of the wall corresponding to the first channel (4) and the projection of the second base portion (52) have no intersection.

Images