A valve stem and valve device

Abstract

The application provides a valve rod and a valve device, the valve rod can reduce the internal leakage of the valve body and the rotating torque. The valve rod comprises a rod part and a sealing part, the rod part and the sealing part are connected, the sealing part comprises a cylindrical structure, the cylindrical structure has a window part, the cylindrical structure comprises a top edge at one end of the window part in the axial direction and a bottom edge at the other end of the window part in the axial direction; the cylindrical structure further comprises a reinforcing rib, one end of the reinforcing rib is connected to the top edge, and the other end of the reinforcing rib is connected to the bottom edge; the cylindrical structure has a gap, at least part of the gap is located on the reinforcing rib, and the gap extends along the axial direction of the valve rod.

Description

Technical Field

[0001] This application relates to the field of valve technology, specifically to a valve stem and valve device. Background Technology

[0002] like Figure 13 As shown, Figure 13 This is a schematic diagram of the valve stem of an electric mixing valve.

[0003] The electric mixing valve includes a valve body and a valve stem 02. The valve stem 02 has a stem portion 201 and a sealing portion 022. The sealing portion 022 has a cylindrical structure with a window portion 022a. During the rotation of the valve stem 02, when the window portion 022a is connected to the channel inside the valve body, it is in the conducting position; when the window portion 022a is misaligned with the channel inside the valve body and is sealed by the wall of the sealing portion 022 and the channel, it is in the blocked position.

[0004] Since the tolerance between the orifice diameter of the valve body and the outer diameter of the valve stem 02 cannot be precisely controlled, when the two are interference fit, the sealing performance is good, but the rotational torque of the valve stem 02 is large; while when the two are clearance fit, the rotational torque is small, but the internal leakage of the valve body will be large. Summary of the Invention

[0005] The purpose of this application is to provide a valve stem and valve device, wherein the valve stem is configured to both reduce internal leakage in the valve body and reduce rotational torque.

[0006] To solve the above-mentioned technical problems, this application provides a valve stem, including a stem portion and a sealing portion, wherein the stem portion and the sealing portion are connected, and the sealing portion includes a cylindrical structure having a window portion. The cylindrical structure includes a top edge surrounding one axial end of the window portion and a bottom edge surrounding the other axial end. The cylindrical structure also includes a reinforcing rib, one end of which is connected to the top edge and the other end of which is connected to the bottom edge. The cylindrical structure has a gap, at least a portion of which is located on the reinforcing rib, and the gap extends axially along the valve stem.

[0007] This application also provides a valve device, including a valve body and a valve stem, wherein the valve stem is the valve stem described above.

[0008] The cylindrical structure of the valve stem in this application has a gap, at least part of which is located at the reinforcing rib, and the gap extends axially along the valve stem. In this embodiment, the radial dimension of the cylindrical structure can be set as large as possible, for example, to form an interference fit with the inner wall of the valve body. Of course, this interference must allow the cylindrical structure to rotate while ensuring a reliable sealing fit with the inner wall of the valve body to minimize internal leakage. During valve stem rotation, the radial deformation capacity is relatively small, but because the gap is located at the reinforcing rib, the cylindrical structure has the ability to deform circumferentially at the reinforcing rib. During valve stem rotation, the cylindrical structure can deform circumferentially, reducing the torque during valve stem rotation. Thus, the valve stem can simultaneously reduce internal leakage and reduce rotational torque. The valve device provided in this application has the same technical effect. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the valve device in one embodiment of this application;

[0010] Figure 2 for Figure 1 Schematic diagram of the middle valve stem;

[0011] Figure 3 for Figure 2 Enlarged diagram of part A in the middle;

[0012] Figure 4 for Figure 2 Top view of the valve stem;

[0013] Figure 5 for Figure 1 A schematic diagram of the central valve device in its first position;

[0014] Figure 6 for Figure 5 An enlarged view of position B in the middle;

[0015] Figure 7 for Figure 1 A schematic diagram of the central valve device in the second position;

[0016] Figure 8 for Figure 7 Enlarged schematic diagram of part C in the middle;

[0017] Figure 9 for Figure 1 A schematic diagram of the central valve device in the third position;

[0018] Figure 10 for Figure 9 Enlarged schematic diagram of part D in the middle;

[0019] Figure 11 This is a top view of the valve stem in another embodiment of this application;

[0020] Figure 12 This is a top view of the valve stem in another embodiment of this application;

[0021] Figure 13 This is a schematic diagram of a valve stem structure.

[0022] The annotations in the attached figures are explained as follows:

[0023] 10-Valve body; 10a-First interface; 10b-Second interface; 10c-Valve cavity;

[0024] 20 - Valve stem;

[0025] 201-Rack section; 202-Sealing section; 2021-Cylindrical structure; 20211-Sealing wall section; 20212-Bottom ridge; 20213-Reinforcing rib; 20214-Top ridge; 2021b-Gap; 2021a-Window section; 2022-Top cover; 20221-Hole end wall section; 2022a-Through hole section;

[0026] 021-Rock section; 022-Sealing section; 022a-Window section; 0221-Reinforcing rib. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Please refer to Figures 1 to 4 , Figure 1 This is a schematic diagram of the valve device in one embodiment of this application; Figure 2 for Figure 1 Schematic diagram of the structure of the middle valve stem 20; Figure 3 for Figure 2 Enlarged diagram of part A in the middle; Figure 4 for Figure 2 Top view of the middle valve stem 20.

[0029] This embodiment provides a valve stem 20 applied to a valve device. The valve device includes a valve body 10 and a valve stem 20 mounted on the valve body 10. The valve stem 20 includes a stem portion 201 and a sealing portion 202, which are connected. Specifically, the stem portion 201 and the sealing portion 202 are connected along the axial direction of the valve stem 20. The stem portion 201 can be drivenly connected to the driving component of the valve device, and the sealing portion 202 can rotate within the valve cavity of the valve device to cooperate with the passage of the valve device, thereby blocking or opening the passage. The valve device is, for example, a... Figure 1 As can be seen from the electric mixing valve shown, it can also be other valve devices that require the valve stem 20 to adjust the opening and closing of the channel.

[0030] like Figure 2As shown, the sealing part 202 includes a cylindrical structure 2021, specifically cylindrical in shape. The cylindrical structure 2021 has a window portion 2021a. Thus, the cylindrical structure 2021 includes the window portion 2021a and an arc-shaped sealing wall portion 20211. The cylindrical structure 2021 includes a top ridge 20214 and a bottom ridge 20212 surrounding the window portion 2021a along its axial direction. The top and bottom are the two ends of the window portion 2021a along its axial direction. When the sealing part 202 rotates, the sealing wall portion 20211 and the channel of the valve body 10 are opposite each other, blocking the channel of the valve device. When rotated to the point where the window portion 2021a and the channel of the valve body 10 are opposite each other, the channel and the window portion 2021a are connected, allowing the relevant passage to be opened. The cylindrical structure 2021 in this embodiment also includes a reinforcing rib 20213. The reinforcing rib 20213 is located at the position of the window portion 2021a. The reinforcing rib 20213 is provided to improve the strength after the window portion 2021a is opened on the cylindrical structure 2021 and to ensure the reliability of the sealing part 202 structure. The reinforcing rib 20213 can be located at the middle position of the window portion 2021a in the circumferential direction of the valve stem 20. One end of the reinforcing rib 20213 is connected to the top edge 20214 and the other end is connected to the bottom edge 20212.

[0031] The reinforcing rib 20213 and the sealing wall 20211 can be an integral structure. For example, the window 2021a can be formed on the complete cylinder by machining, thus forming the reinforcing rib 20213 and the sealing wall 20211 integrally.

[0032] It is worth noting that the cylindrical structure 2021 in this embodiment has a gap 2021b, at least a portion of which is located at the reinforcing rib 20213, and the gap 2021b extends axially along the valve stem 20. In this embodiment, the radial dimension of the cylindrical structure 2021 is set as large as possible, for example, with an interference fit, to ensure that the cylindrical structure 2021 can rotate and can reliably seal with the inner wall of the valve body 10 to minimize internal leakage. Therefore, the radial deformation capability of the valve stem 20 during rotation is small. However, in this embodiment, because the gap 2021b is set at the position of the reinforcing rib 20213, the cylindrical structure 2021 has the ability to deform circumferentially at the position of the reinforcing rib 20213. During the rotation of the valve stem 20, it can deform and shrink circumferentially, which is equivalent to reducing the radial dimension. This reduces the torque during the rotation of the valve stem 20. Even if the interference is large due to machining deviation, the setting of the gap 2021b can reduce the influence of the interference on the rotation. As can be seen, the valve stem 20 in this embodiment can both reduce internal leakage and reduce rotational torque.

[0033] Can be combined Figures 5 to 10 understand, Figure 5 for Figure 1A schematic diagram of the valve stem 20 of the intermediate valve device in the first position; Figure 6 for Figure 5 An enlarged view of position B in the middle; Figure 7 for Figure 1 A schematic diagram of the valve stem 20 in the second position; Figure 8 for Figure 7 Enlarged schematic diagram of part C in the middle; Figure 9 for Figure 1 A schematic diagram of the valve stem 20 in the third position; Figure 10 for Figure 9 Enlarged schematic diagram of part D in the middle.

[0034] The valve body 10 of the valve device in this embodiment has a valve cavity 10c, a first interface 10a and a second interface 10b, and is also provided with two outlets. Each of the two outlets is equipped with a valve stem 20 to control the opening degree of the outlet. Figure 5 The valve stem 20 is in the first position, which can be defined as the 0° position. At this time, the first port 10a, the second port 10b, and both outlets are connected. When the first port 10a and the second port 10b are opened, the medium flows in from the first port 10a and the second port 10b, mixes with the valve stem 20, and flows out. The flow rate of the first port 10a and the second port 10b can be adjusted by adjusting the opening degree of the first port 10a and the second port 10b. When the medium temperature of the first port 10a and the second port 10b is different, the outlet medium temperature of the valve device can be adjusted.

[0035] like Figure 7 , 8 As shown, the two valve stems 20 are in the second position, having rotated a certain angle from the first position, the angle being between 0° and 180°. Figure 8 When the lower valve stem 20 is rotated 90° counterclockwise and the upper valve stem 20 is rotated 90° clockwise, the first port 10a is connected to the two outlets, and the second port 10b and the two outlets are blocked and disconnected by the sealing part 202 of their respective valve stem 20. The medium can flow in from the first port 10a and flow out through the valve stem 20.

[0036] like Figure 9 , 10 As shown, the two valve stems 20 are in the third position. The valve stem 20 on the lower side rotates 180° counterclockwise from the first position, and the valve stem 20 on the upper side rotates 180° clockwise from the first position. At this time, the first port 10a, the second port 10b and the two outlets are all blocked and disconnected by the sealing part 202 of the valve stem 20, and no medium flows out.

[0037] In this embodiment, the slit 2021b of the valve stem 20 extends axially through at least one end of the cylindrical structure 2021. In this embodiment, the slit 2021b extends through both ends of the cylindrical structure 2021, that is, axially through the reinforcing rib 20213, the bottom rib 20212, and the top rib 20214. This is equivalent to creating a notch in the cylindrical structure 2021, breaking the cylindrical structure 2021 circumferentially at the position of the slit 2021b. With this configuration, when the valve stem 20 rotates, the cylindrical structure 2021 can contract as a whole towards the position of the slit 2021b, further enhancing its elastic deformation capability. The radial dimension of the valve stem 20 can be reduced as a whole, thereby further reducing torque during rotation.

[0038] You can continue to refer to this. Figure 3 The sealing part 202 of the valve stem 20 also includes a top cover 2022 located on the cylindrical structure 2021. The top cover 2022 seals one end of the cylindrical structure 2021, that is, the sealing part 202 is similar to a barrel structure. The radial dimension of the stem 201 is smaller than the radial dimension of the cylindrical structure 2021. With the top cover 2022 located at one axial end of the cylindrical structure 2021, the stem 201 of the valve stem 20 can be connected to the top cover 2022. The stem 201, the top cover 2022 and the cylindrical structure 2021 can be an integral structure, such as an integral injection molded structure. Of course, they can also be set separately and then connected.

[0039] It is worth noting that, in this embodiment, the top cover 2022 of the sealing part 202 may have a through hole 2022a extending through the top cover 2022 axially, and the gap 2021b and the through hole 2022a are connected, specifically, they are connected in a direction perpendicular to the axial direction. Figure 4 As shown, the top cover 2022 of the sealing part 202 does not completely cover the end of the cylindrical structure 2021, but is partially hollowed out. In this way, when the cylindrical structure 2021 rotates, it is not easily hindered by the top cover 2022 when the gap 2021b shrinks in the circumferential direction. The elastic deformation capability of the sealing part 202 in the circumferential direction is further improved, making it easier to shrink and reduce the rotational torque.

[0040] Figure 4In this design, the through-hole portion 2022a is specifically an arc-shaped hole surrounding the rod portion 201. It is understood that the rod portion 201 needs to connect to the top cover 2022 of the sealing portion 202, and the rotation of the rod portion 201 needs to be transmitted to the top cover 2022. That is, the rod portion 201 drives the rotation of the entire sealing portion 202 by rotating the top cover 2022. Therefore, the top cover 2022 can only have a portion hollowed out as the through-hole portion 2022a, while retaining necessary portions to connect the rod portion 201 and achieve the purpose of transmission. Setting the through-hole portion 2022a as an arc-shaped hole surrounding the rod portion 201 reduces stress concentration. Furthermore, the through-hole portion 2022a can be symmetrically arranged relative to the gap 2021b. In this way, the structure of the sealing portion 202 is symmetrical on both sides of the gap 2021b, resulting in more even stress distribution during forward and reverse rotation.

[0041] In this embodiment, the angle of the central angle corresponding to the arc-shaped hole portion 2022a, which serves as the through hole portion, can be between 90° and 210°. It is known that if the angle of the central angle is too large, the solid area of ​​the top cover 2022 will be too small; if the angle of the central angle is too small, the improvement in elastic deformation capability will be limited. Setting the angle of the central angle between 90° and 210° can balance the strength and elastic deformation capability of the top cover 2022.

[0042] like Figure 4 As shown, projected axially, the projection of the gap 2021b gradually widens in the direction away from the inner cavity of the cylindrical structure 2021. It should be understood that the cylindrical structure 2021 of the sealing part 202 seals by contacting the outer surface with the inner wall of the valve body 10, meaning the outer surface of the cylindrical structure 2021 directly rubs against the inner wall of the valve body 10. Therefore, the deformation caused by friction gradually decreases from the outside to the inside. Here, "outside" of the cylindrical structure 2021 refers to the direction away from the inner cavity of the cylindrical structure 2021, and conversely, "inside" refers to the direction closer to the inner cavity of the cylindrical structure 2021. Therefore, setting the gap 2021b to gradually widen from the inside to the outside ensures that the width change of the gap 2021b matches the change in frictional deformation. The width of the gap 2021b is the circumferential dimension of the gap 2021b along the valve stem 20. With this configuration, the width of the gap 2021b can be set to be relatively large in locations with relatively high friction deformation requirements, and the width of the gap 2021b can be appropriately reduced in locations with relatively low friction deformation requirements, so as to avoid the gap 2021b being too wide and affecting the overall strength of the cylindrical structure 2021.

[0043] For example, the maximum circumferential width of the slit 2021b can be 1 / 20 to 1 / 30 of the circumference of the cylindrical structure 2021. As mentioned above, when the slit 2021b extends through both ends of the cylindrical structure 2021 axially, an excessively large width of the slit 2021b would affect the strength of the cylindrical structure 2021. Therefore, limiting the maximum width of the slit 2021b to 1 / 20 to 1 / 30 of the circumference can balance the requirements of strength and elastic deformation.

[0044] You can continue to refer to this. Figure 11 and Figure 12 , Figure 11 This is a top view of the valve stem 20 in another embodiment of this application; Figure 12 This is a top view of the valve stem 20 in another embodiment of this application.

[0045] Figure 4 In the middle, the central angle corresponding to the through hole 2022a is less than 180°, and the hole end wall 20221 corresponding to its two ends along the circumference is a straight wall. Figure 11 The central angle of the through hole 2022a is greater than 180°, and its end wall 20221 is also a straight wall. Figure 12 If the central angle corresponding to the through hole 2022a is greater than 180°, then the hole end wall 20221 corresponding to both ends along the axial direction can be an arc-shaped wall, which can reduce stress concentration.

[0046] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A valve stem, characterized in that, The valve stem (20) includes a stem portion (201) and a sealing portion (202), the stem portion (201) and the sealing portion (202) being connected. The sealing portion (202) includes a cylindrical structure (2021), the cylindrical structure (2021) having a window portion (2021a), the cylindrical structure (2021) including a top ridge (20214) surrounding one axial end of the window portion (2021a) and a bottom ridge (20212) surrounding the other axial end. The cylindrical structure (2021) further includes a reinforcing rib (20213), one end of which is connected to the top edge (20214) and the other end of which is connected to the bottom edge (20212); the cylindrical structure (2021) has a slit (2021b), at least a portion of which is located on the reinforcing rib (20213) and extends axially along the valve stem (20).

2. The valve stem according to claim 1, characterized in that, The slit (2021b) extends along the axial direction through at least one end of the cylindrical structure (2021).

3. The valve stem according to claim 2, characterized in that, The sealing part (202) includes a top cover (2022) located on the cylindrical structure (2021), and the rod part (201) is connected to the top cover (2022); the top cover (2022) has a through hole (2022a) extending through the top cover (2022) along the axial direction, and the gap (2021b) communicates with the through hole (2022a).

4. The valve stem according to claim 3, characterized in that, The through hole (2022a) is an arc-shaped hole that surrounds the rod (201).

5. The valve stem according to claim 4, characterized in that, The angle of the central angle corresponding to the arc-shaped hole is between 90° and 120°.

6. The valve stem according to claim 4 or 5, characterized in that, The end wall portions (20221) corresponding to the two ends of the through hole portion (2022a) along the circumferential direction are either straight walls or arc-shaped walls.

7. The valve stem according to any one of claims 3-5, characterized in that, The through-hole portion (2022a) is symmetrically arranged relative to the gap (2021b).

8. The valve stem according to any one of claims 1-5, characterized in that, The projection of the slit (2021b) along the axial projection of the valve stem (20) is gradually widened in the direction away from the inner cavity of the cylindrical structure (2021).

9. The valve stem according to any one of claims 1-5, characterized in that, The maximum circumferential width of the gap (2021b) is 1 / 20 to 1 / 30 of the circumference of the cylindrical structure (2021).

10. A valve device, characterized in that, It includes a valve body (10) and a valve stem (20), wherein the valve stem (20) is the valve stem (20) as described in any one of claims 1-9.

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