Valve core assembly and stop valve

Abstract

This application relates to the field of valve technology, and in particular to a valve core assembly and a gate valve. The valve core assembly includes a moving valve core and a valve stem. A drive groove is recessed on the surface of the moving valve core near the valve stem end. A pawl is provided at one end of the valve stem, inserting into the drive groove and contacting the sidewall of the drive groove to drive the moving valve core to rotate around the axis of the valve core assembly. The number of drive grooves is at least three, and these three drive grooves are spaced apart circumferentially on the moving valve core of the valve core assembly. Each drive groove can engage with a corresponding pawl. The number of drive grooves is defined as N, and the angle formed between the centerline of any one drive groove along the circumferential direction of the valve core assembly and the centerline of another adjacent drive groove along the circumferential direction of the valve core assembly is set to 360° / N. The valve core assembly and gate valve provided in this application solve the problem of easy misalignment of the valve stem when assembling the pawl on the valve stem with the moving valve core in existing valves.

Description

Technical Field

[0001] This application relates to the field of valve technology, and in particular to a valve core assembly and a gate valve. Background Technology

[0002] Gate valves are widely used in air conditioning systems to cut off the refrigerant passage in case of leaks or during maintenance, thereby ensuring the safety of the air conditioning system.

[0003] In related technologies, a gate valve contains a valve stem and a moving valve core. The valve stem is connected to the moving valve core via jaws to drive the moving valve core to rotate, thereby opening or closing the valve port. However, existing valve stem structures typically have two opposing jaws. This means the valve stem and moving valve core only have two support points at the radial ends of the moving valve core, resulting in insufficient support area and an inability to form a circumferential constraint, easily leading to uneven stress. Therefore, when the jaws engage with the moving valve core, the valve stem is prone to skew, reducing structural stability and affecting the normal operation of the gate valve. Utility Model Content

[0004] Therefore, it is necessary to provide a valve core assembly and a shut-off valve to solve the problem that the valve stem is prone to misalignment when the claws on the existing valve stem are assembled with the moving valve core.

[0005] This application provides a valve core assembly, which includes a movable valve core and a valve stem. The movable valve core has a driving groove recessed on its surface near one end of the valve stem. One end of the valve stem is provided with a pawl, which is inserted into the driving groove and contacts the side wall of the driving groove to drive the movable valve core to rotate around the axis of the valve core assembly. The number of driving grooves is at least three, and at least three driving grooves are spaced apart on the movable valve core along the circumferential direction of the valve core assembly. Each driving groove can be engaged with the corresponding pawl. The number of driving grooves is defined as N, and the angle formed between the center line of any one driving groove along the circumferential direction of the valve core assembly and the center line of another adjacent driving groove along the circumferential direction of the valve core assembly is set to 360° / N.

[0006] In one embodiment, the plurality of drive slots have the same width along the circumferential direction of the valve core assembly.

[0007] In one embodiment, the valve core assembly further includes a stationary valve core, which is disposed on the side of the moving valve core away from the valve stem and abuts against the moving valve core; the stationary valve core has a valve port, and the moving valve core includes a sealing part and a flow part. As the moving valve core rotates, the sealing part can move to the position of the valve port and block the valve port, or the flow part can move to the position of the valve port and open the valve port.

[0008] In one embodiment, the number of sealing portions and flow portions is at least three. Along the circumference of the valve core assembly, the sealing portions and flow portions are arranged alternately in sequence, and the included angle formed between the two sides of the sealing portion and the two adjacent flow portions is equal to the included angle formed between the two sides of the flow portion and the two adjacent sealing portions.

[0009] In one embodiment, the number of valve ports is the same as the number of flow sections, and the plurality of valve ports are evenly spaced along the circumference of the valve core assembly.

[0010] In one embodiment, the projections of the sealing portion and the flow portion along the axial direction of the valve core assembly onto the valve port are both able to cover the valve port.

[0011] In one embodiment, the flow portion is configured as a notch extending through both ends of the moving valve core axially, and the drive groove is formed on the sealing portion.

[0012] In one embodiment, the cross-sectional area of ​​the claw along its extension direction remains constant, and the cross-sectional shape remains consistent.

[0013] In one embodiment, the claw is press-fitted into the drive groove.

[0014] This application also provides a shut-off valve, which includes a valve body assembly, a drive assembly, and a valve core assembly as described in any of the above embodiments. The valve body assembly includes a main valve body, a valve seat, a mounting flange, a first connecting pipe, and a second connecting pipe. A valve cavity is formed within the main valve body. Along the axial direction of the valve cavity, the valve seat is mounted at one end of the valve cavity, and one end of the valve seat is connected to the valve core assembly, while the other end is connected to the first connecting pipe. The mounting flange is located at one end of the main valve body and engages with the valve seat along the axial direction. The second connecting pipe is connected to the periphery of the main valve body. The drive assembly includes a drive element, an elastic element, a fixing element, a first bearing, and a second bearing. The drive element is connected to the valve stem away from the moving valve core. One end is used to drive the valve stem to rotate. A mounting portion is formed by a protrusion on the periphery of the valve stem. The pawl is connected to the end of the mounting portion near the moving valve core. The fixing member is sleeved on the end of the valve stem away from the moving valve core, and the outer wall of the fixing member is fixedly connected to the inner wall of the valve cavity. The elastic member and the first bearing are installed between the mounting portion and the fixing member. One end of the elastic member abuts against the mounting portion, and the other end applies force to the first bearing so that the first bearing abuts against the fixing member. The second bearing is located at the end of the first bearing away from the elastic member, and the outer ring of the second bearing is connected to the fixing member. The inner ring of the second bearing is sleeved and connected to the valve stem.

[0015] Compared with existing technologies, the valve core assembly and shut-off valve provided in this application are connected by at least three drive grooves and clamps. The clamps can better cover the moving valve core in the circumferential direction, thereby increasing the contact area between the two and forming a ring constraint. Compared with traditional structures, this not only improves the stability of the connection between the valve stem and the moving valve core, but also reduces the likelihood of valve stem misalignment during the connection process of the clamps and drive grooves, thus greatly reducing the probability of component damage and improving the overall structural reliability. At the same time, since the multiple drive grooves are evenly distributed, no force imbalance occurs between the valve stem and the moving valve core during the process of the valve stem driving the moving valve core to rotate, and the movement of the moving valve core is more stable. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of a shut-off valve according to an embodiment of this application;

[0018] Figure 2 An exploded view of a valve core assembly according to an embodiment provided in this application;

[0019] Figure 3 A top view of the moving valve core according to an embodiment provided in this application.

[0020] The symbols in the diagram represent the following meanings:

[0021] 100. Gate valve; 10. Valve core assembly; 11. Stationary valve core; 111. Valve port; 12. Moving valve core; 121. Sealing part; 1211. Drive groove; 122. Flow part; 13. Valve stem; 131. Claw; 132. Mounting part; 20. Valve body assembly; 21. Main valve body; 211. Valve cavity; 22. Valve seat; 23. Mounting flange; 24. First connecting pipe; 25. Second connecting pipe; 30. Drive assembly; 31. Drive component; 32. Elastic component; 33. Fixing component; 34. First bearing; 35. Second bearing. Detailed Implementation

[0022] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0023] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0027] Gate valves are widely used in air conditioning systems to cut off the refrigerant passage in case of leaks or during maintenance, thereby ensuring the safety of the air conditioning system.

[0028] In related technologies, a gate valve contains a valve stem and a moving valve core. The valve stem is connected to the moving valve core via jaws to drive the moving valve core to rotate, thereby opening or closing the valve port. However, existing valve stem structures typically have two opposing jaws. This means the valve stem and moving valve core only have two support points at the radial ends of the moving valve core, resulting in insufficient support area and an inability to form a circumferential constraint, easily leading to uneven stress. Therefore, when the jaws engage with the moving valve core, the valve stem is prone to misalignment, affecting the normal operation of the gate valve.

[0029] Please see Figures 1-3 To address the problem of valve stem misalignment during assembly of the existing valve stem with the retainer and moving valve core, this application provides a valve core assembly 10. The valve core assembly 10 includes a stationary valve core 11, a moving valve core 12, and a valve stem 13. The moving valve core 12 has a recessed drive groove 1211 near the valve stem 13. One end of the valve stem 13 has a retainer 131 that inserts into and engages with the drive groove 1211, contacting the sidewall of the drive groove 1211 to drive the moving valve core 12 to rotate around the axis of the valve core assembly 10. The stationary valve core 11 is located on the side of the moving valve core 12 away from the valve stem 13 and engages with it. The stationary valve core 11 has a valve port 111. When the moving valve core 12 rotates relative to the stationary valve core 11, the moving valve core 12 can open or close the valve port 111 on the stationary valve core 11.

[0030] In one embodiment, such as Figure 2 As shown, the number of drive slots 1211 is at least three, and at least three drive slots 1211 are spaced apart on the moving valve core 12 along the circumferential direction of the valve core assembly 10. Each drive slot 1211 can engage with a corresponding claw 131. The number of drive slots 1211 is defined as N, and the angle formed between the center line of any one drive slot 1211 along the circumferential direction of the valve core assembly 10 and the center line of another adjacent drive slot 1211 along the circumferential direction of the valve core assembly 10 is set to 360° / N. That is, at least three drive slots 1211 are evenly spaced along the circumferential direction of the valve core assembly 10.

[0031] Understandably, by connecting at least three drive slots 1211 with the claws 131, the claws 131 can better cover the moving valve core 12 in the circumferential direction, thereby increasing the contact area between the two and forming a ring constraint. Compared with the traditional structure, this not only improves the stability of the connection between the valve stem 13 and the moving valve core 12, but also makes it less likely for the valve stem 13 to tilt during the connection process between the claws 131 and the drive slots 1211, thus greatly reducing the probability of component damage and improving the overall structural reliability. At the same time, since the multiple drive slots 1211 are evenly distributed, there will be no force imbalance between the valve stem 13 and the moving valve core 12 during the process of the valve stem 13 driving the moving valve core 12 to rotate, and the movement of the moving valve core 12 is more stable.

[0032] Furthermore, in one embodiment, as Figure 3 As shown, the width of the multiple drive grooves 1211 along the circumference of the valve core assembly 10 is all the same. This ensures more even force distribution during the connection between the valve stem 13 and the moving valve core 12, further reducing the probability of the valve stem 13 becoming misaligned. Simultaneously, it also reduces the difficulty of fitting the valve stem 13 and the moving valve core 12 together.

[0033] Specifically, in this embodiment, the claw 131 is press-fitted with the drive groove 1211, so that the connection between the claw 131 and the moving valve core 12 is simple and the connection strength between the two can be guaranteed.

[0034] In traditional double-jaw structures, the connection between the jaw 131 and the moving valve core 12 lacks stability. Therefore, to improve this stability, a stepped structure is typically added to the jaw 131 to further abut against the moving valve core 12. This increases the machining steps for the jaw 131 and also requires increasing its thickness to form the stepped structure, thus increasing material costs. In this application, however, at least three drive slots 1211 cooperate with the jaw 131, ensuring the stability of the connection between the moving valve core 12 and the valve stem 13. Therefore, the stepped structure on the traditional jaw 131 can be eliminated, allowing the cross-sectional area of ​​the jaw 131 along its extension direction to remain constant, and the cross-sectional shape to remain consistent. This significantly improves the machining efficiency of the jaw 131 while reducing its machining cost.

[0035] In one embodiment, such as Figure 2 and Figure 3 As shown, the movable valve core 12 includes a sealing part 121 and a flow part 122. As the movable valve core 12 rotates, the sealing part 121 can move to the position of the valve port 111 and seal the valve port 111, or the flow part 122 can move to the position of the valve port 111 and open the valve port 111. In this way, the movable valve core 12 and the valve port 111 are switched on and off.

[0036] In order to facilitate the processing of the flow section 122, the flow section 122 can be configured as a notch that penetrates both ends of the moving valve core 12 axially. That is, the flow section 122 extends to the outer side wall of the moving valve core 12, thereby forming a V-shaped notch structure, which effectively reduces the processing difficulty. At this time, the drive groove 1211 can be opened on the sealing section 121.

[0037] Furthermore, the projections of the sealing part 121 and the flow part 122 along the axial direction of the valve core assembly 10 onto the valve port 111 can both cover the valve port 111, ensuring that the sealing part 121 and the flow part 122 can completely seal or open the valve port 111, avoiding leakage and other problems, while also ensuring the flow performance of the valve port 111.

[0038] In one embodiment, the number of sealing portions 121 and flow portions 122 is at least three. Along the circumference of the valve core assembly 10, the sealing portions 121 and flow portions 122 are arranged alternately in sequence, and the included angle formed between the two sides of the sealing portion 121 that contact the two adjacent flow portions 122 is equal to the included angle formed between the two sides of the flow portion 122 that contact the two adjacent sealing portions 121.

[0039] Taking three sealing parts 121 and three flow parts 122 as an example, it is easy to understand that in this case, both sealing parts 121 and flow parts 122 are arranged at 60°. Therefore, the valve stem 13 only needs to rotate 60° to achieve the switching of sealing parts 121 and flow parts 122 relative to the valve port 111. Compared with the traditional two-claw structure valve stem 13, which needs to rotate at least 90°, this embodiment effectively reduces the rotation angle of the valve stem 13 and the rotation distance of the moving valve core 12 is shorter, thereby greatly improving the valve opening and closing speed.

[0040] Of course, in other embodiments, the number of sealing parts 121 and flow parts 122 can also be set to four, five or six, etc., in which case the corresponding rotation angles of valve stem 13 would be 45°, 36° and 30° respectively. That is, if the number of sealing parts 121 and flow parts 122 is defined as n, then the rotation switching angle of valve stem 13 can be set to 360° / (2n).

[0041] In this design, a drive groove 1211 can be provided on each sealing part 121 so that the number of claws 131 is equal to the number of sealing parts 121, thereby facilitating the connection between the valve stem 13 and the moving valve core 12.

[0042] Furthermore, in one embodiment, the number of valve ports 111 is the same as the number of flow portions 122, and the multiple valve ports 111 are evenly spaced along the circumference of the valve core assembly 10. That is, one of the sealing portion 121 and the flow portion 122 can simultaneously cooperate with all valve ports 111, thereby ensuring sealing when closed and improving the flow performance at the valve ports 111 when open.

[0043] This application also provides a shut-off valve 100, such as Figure 1 As shown, the shut-off valve 100 includes a valve body assembly 20, a drive assembly 30, and a valve core assembly 10 from any of the above embodiments. The valve body assembly 20 includes a main valve body 21, a valve seat 22, a mounting flange 23, a first connecting pipe 24, and a second connecting pipe 25. A valve cavity 211 is formed within the main valve body 21. Along the axial direction of the valve cavity 211, the valve seat 22 is mounted at one end of the valve cavity 211, with one end connected to the valve core assembly 10 and the other end connected to the first connecting pipe 24. The second connecting pipe 25 is connected to the periphery of the main valve body 21. The mounting flange 23 is located at one end of the main valve body 21 and engages with the valve seat 22 axially. The mounting flange 23 can be welded to both the main valve body 21 and the valve seat 22 to ensure reliable connection.

[0044] Specifically, the stationary valve core 11 is limited and installed within the valve seat 22 to prevent rotation relative to the valve seat 22, thereby ensuring the reliability of the fit between the moving valve core 12 and the stationary valve core 11. Thus, when the moving valve core 12 rotates to open the valve port 111, the first connecting pipe 24 and the second connecting pipe 25 can communicate through the valve cavity 211 and the valve port 111; when the moving valve core 12 rotates to close the valve port 111, the communication between the first connecting pipe 24 and the second connecting pipe 25 is correspondingly cut off.

[0045] Furthermore, the drive assembly 30 includes a drive member 31, an elastic member 32, a fixing member 33, a first bearing 34, and a second bearing 35. The drive member 31 is connected to the end of the valve stem 13 away from the moving valve core 12 and is used to drive the valve stem 13 to rotate. A mounting portion 132 is formed protruding from the periphery of the valve stem 13, and a pawl 131 is connected to the end of the mounting portion 132 near the moving valve core 12. The fixing member 33 is sleeved on the end of the valve stem 13 away from the moving valve core 12, and the outer wall of the fixing member 33 is fixedly connected to the inner wall of the valve cavity 211. The elastic member 32 and the first bearing 34 are installed between the mounting portion 132 and the fixing member 33, and one end of the elastic member 32 abuts against the mounting portion 132, while the other end applies force to the first bearing 34 so that the first bearing 34 abuts against the fixing member 33. The second bearing 35 is located at the end of the first bearing 34 away from the elastic member 32, and the outer ring of the second bearing 35 is connected to the fixing member 33, and the inner ring of the second bearing 35 is sleeved and connected to the valve stem 13.

[0046] Here, the first bearing 34 can be configured as a thrust bearing, which can better withstand axial forces and reduce rotational resistance. The second bearing 35 can be configured as a needle roller bearing, which can ensure the verticality of the valve stem 13 and reduce frictional resistance. Simultaneously, since the fixed member 33 is fixed relative to the valve body, and the elastic force generated by the elastic member 32 can be applied to the fixed member 33 through the first bearing 34, the elastic member 32 can apply a force to the mounting portion 132 in the direction closer to the moving valve core 12, enabling the valve stem 13 to provide stable sealing pressure to the moving valve core 12. Specifically, the elastic member 32 can be a disc-shaped spring, which makes the installation more stable.

[0047] 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.

[0048] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A valve core assembly (10) includes a movable valve core (12) and a valve stem (13), wherein a drive groove (1211) is recessed on the surface of the movable valve core (12) near one end of the valve stem (13), and a pawl (131) is provided at one end of the valve stem (13), the pawl (131) is inserted into the drive groove (1211), and the pawl (131) contacts the side wall of the drive groove (1211) to drive the movable valve core (12) to rotate around the axis of the valve core assembly (10); characterized in that The number of drive slots (1211) is at least three, and at least three drive slots (1211) are spaced apart on the moving valve core (12) along the circumferential direction of the valve core assembly (10), and each drive slot (1211) can be engaged and connected with the corresponding claw (131). The number of drive slots (1211) is defined as N, and the angle formed between the center line of any one drive slot (1211) along the circumferential direction of the valve core assembly (10) and the center line of another adjacent drive slot (1211) along the circumferential direction of the valve core assembly (10) is set to 360° / N.

2. The valve trim assembly (10) of claim 1, characterized in that, The width of each of the drive slots (1211) is the same along the circumference of the valve core assembly (10).

3. The valve trim assembly (10) of claim 1, characterized in that, The valve core assembly (10) also includes a stationary valve core (11), which is located on the side of the moving valve core (12) away from the valve stem (13) and abuts against the moving valve core (12). The stationary valve core (11) has a valve port (111) and the moving valve core (12) includes a sealing part (121) and a flow part (122). As the moving valve core (12) rotates, the sealing part (121) can move to the position of the valve port (111) and block the valve port (111), or the flow part (122) can move to the position of the valve port (111) and open the valve port (111).

4. The valve trim assembly (10) of claim 3, characterized in that, The number of the sealing part (121) and the flow part (122) is at least three. Along the circumference of the valve core assembly (10), the sealing part (121) and the flow part (122) are arranged alternately in sequence, and the included angle formed between the two sides of the sealing part (121) and the two adjacent flow parts (122) is equal to the included angle formed between the two sides of the flow part (122) and the two adjacent sealing parts (121).

5. The valve trim assembly (10) of claim 4, characterized in that, The number of valve ports (111) is the same as the number of flow sections (122), and the plurality of valve ports (111) are evenly spaced along the circumference of the valve core assembly (10).

6. The valve trim assembly (10) of claim 3, characterized in that, The projections of the sealing portion (121) and the flow portion (122) along the axial direction of the valve core assembly (10) onto the valve port (111) can both cover the valve port (111).

7. The valve trim assembly (10) of claim 3, characterized in that, The flow section (122) is configured as a notch that passes through both ends of the moving valve core (12) axially, and the drive groove (1211) is opened on the sealing section (121).

8. The valve core assembly (10) according to claim 1, characterized in that, The cross-sectional area of ​​the claw (131) along its extension direction remains constant, and the cross-sectional shape remains consistent.

9. The valve trim assembly (10) of claim 1, characterized in that, The claw (131) is press-fitted with the drive groove (1211).

10. A stop valve characterized by comprising: The device includes a valve body assembly (20), a drive assembly (30), and a valve core assembly (10) as described in any one of claims 1-9. The valve body assembly (20) includes a main valve body (21), a valve seat (22), a mounting flange (23), a first connecting pipe (24), and a second connecting pipe (25). A valve cavity (211) is provided in the main valve body (211). Along the axial direction of the valve cavity (211), the valve seat (22) is installed at one end of the valve cavity (211), and one end of the valve seat (22) is connected to the valve core assembly (10), and the other end is connected to the first connecting pipe (24). The mounting flange (23) is provided at one end of the main valve body (21) and is axially stopped with the valve seat (22). The second connecting pipe (25) is connected to the periphery of the main valve body (21). The drive assembly (30) includes a drive member (31), an elastic member (32), a fixing member (33), a first bearing (34), and a second bearing (35). The drive member (31) is connected to the end of the valve stem (13) away from the moving valve core (12) and is used to drive the valve stem (13) to rotate. A mounting portion (132) is formed on the circumferential side of the valve stem (13). The pawl (131) is connected to the end of the mounting portion (132) near the moving valve core (12). The fixing member (33) is sleeved on the end of the valve stem (13) away from the moving valve core (12), and the outer wall of the fixing member (33) is flush with the valve cavity. The inner wall of 211) is fixedly connected, the elastic element (32) and the first bearing (34) are installed between the mounting part (132) and the fixing part (33), and one end of the elastic element (32) abuts against the mounting part (132), and the other end applies force to the first bearing (34) so ​​that the first bearing (34) abuts against the fixing part (33); the second bearing (35) is located at the end of the first bearing (34) away from the elastic element (32), and the outer ring of the second bearing (35) is connected to the fixing part (33), and the inner ring of the second bearing (35) is sleeved and connected to the valve stem (13).

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