Vacuum regulating valve

Abstract

The utility model relates to the technical field of regulating valves, and provides a vacuum regulating valve which comprises a valve body, a valve element, a valve rod, a fixing pin and an actuator. The valve element is arranged in the valve body, the valve element is provided with a mounting hole and a first pin hole, and a first thread is formed in the mounting hole; the valve rod is provided with a first connecting end and a second connecting end, the first connecting end is provided with a second thread and a second pin hole, and the second thread is matched with the first thread; the fixing pin penetrates through the first pin hole and the second pin hole, and the direction of the central axis of the fixing pin intersects with the direction of the central axis of the valve rod. The actuator is connected with the second connecting end of the valve rod, so that the actuator can drive the valve element to act through the valve rod, and the system pressure can be adjusted through the vacuum adjusting valve. After the valve element and the valve rod are matched through the first thread and the second thread, the fixing pin penetrates through the first pin hole and the second pin hole to connect the valve element and the valve rod, connection between the valve element and the valve rod is further enhanced, and the risk that the valve element and the valve rod fall off is effectively avoided or reduced.

Description

Technical Field

[0001] The present application relates to the technical field of regulating valves, and in particular to a vacuum regulating valve. Background Art

[0002] The regulating valve is an important device in the high vacuum system. The regulating valve generally includes a valve body, a valve core, a valve stem and an actuator. The valve core is set in the valve body, the valve core is connected to one end of the valve stem, and the other end of the valve stem is connected to the actuator. The actuator drives the valve core to move through the valve stem to adjust the opening of the regulating valve, thereby adjusting the system pressure.

[0003] In the conventional regulating valve, the valve core and the valve stem are generally directly connected by threads. As the regulating valve works for a long time, there is a risk that the valve core will be separated from the valve stem. Utility Model Content

[0004] The present application provides a vacuum regulating valve to solve the technical problem in the prior art that the valve core and the valve stem of the regulating valve are easily separated.

[0005] In order to solve the above problems, the present application provides a vacuum regulating valve, which includes:

[0006] Valve body;

[0007] A valve core is arranged in the valve body, the valve core has a mounting hole and a first pin hole, and a first thread is formed in the mounting hole;

[0008] The valve stem has a first connecting end and a second connecting end, the first connecting end has a second thread and a second pin hole, the second thread cooperates with the first thread;

[0009] A fixing pin is arranged to pass through the first pin hole and the second pin hole, and the direction of the central axis of the fixing pin intersects with the direction of the central axis of the valve stem;

[0010] An actuator is connected to the second connection end.

[0011] In some embodiments, the mounting hole includes a tapered hole section and a threaded hole section, the first thread is formed in the threaded hole section, the threaded hole section is located at the small diameter end of the tapered hole section, and the large diameter end of the tapered hole section forms the opening of the mounting hole;

[0012] The first connecting end is formed with a tapered column section and a threaded column section, the second thread is formed on the threaded column section, the threaded column section is located at the small diameter end of the tapered column section, and the tapered column section cooperates with the tapered hole section.

[0013] In some embodiments, the first pin hole is formed in the tapered hole section; and the second pin hole is formed in the tapered column section.

[0014] In some embodiments, the vacuum regulating valve further comprises:

[0015] Valve cover;

[0016] A bellows assembly comprises a bellows and a connecting sleeve, wherein the bellows is sleeved outside the valve stem, and a first connecting portion and a second connecting portion are respectively provided at opposite ends of the bellows, and end surfaces of the first connecting portion and the second connecting portion facing away from one end of the bellows are both formed with a stepped hole structure, the first connecting portion is connected to the valve core, the second connecting portion is connected to the connecting sleeve, and the connecting sleeve is sleeved with the valve cover.

[0017] In some embodiments, the valve stem passes through the valve cover, and at least one first sealing ring is disposed between the circumference of the valve stem and the valve cover.

[0018] In some embodiments, a second sealing ring is provided between the end surfaces of the valve cover and the connecting sleeve that cooperate with each other.

[0019] In some embodiments, the actuator is threadedly connected to the second connection end, and a plurality of butterfly springs are provided between the actuator and the valve cover, and the butterfly springs are used to eliminate the thread gap between the second connection end and the actuator.

[0020] In some embodiments, the fixing pin is an elastic cylindrical pin.

[0021] In some embodiments, the valve body is provided with a through hole that cooperates with the valve core, the through hole forms an abutment surface in the circumferential direction toward one side of the valve body, a sealing gasket is provided on the abutment surface, and an elastic retaining ring is also provided on the side of the sealing gasket facing away from the abutment surface.

[0022] In some embodiments, a sharp tooth structure is formed on the abutment surface.

[0023] The beneficial effects of the implementation methods of the present application are as follows: the vacuum regulating valve provided by the present application includes a valve body, a valve core, a valve stem, a fixing pin and an actuator; the valve core is arranged in the valve body, the valve core has a mounting hole and a first pin hole, and a first thread is formed in the mounting hole; the valve stem has a first connecting end and a second connecting end, the first connecting end has a second thread and a second pin hole, and the second thread cooperates with the first thread; the fixing pin passes through the first pin hole and the second pin hole, and the direction of the central axis of the fixing pin intersects with the direction of the central axis of the valve stem; the actuator is connected to the second connecting end of the valve stem. The present application can effectively avoid the situation where the valve stem and the valve core are separated during the operation of the regulating valve by further fixing the valve core and the valve stem with a fixing pin after the valve core and the valve stem are threadedly connected, thereby ensuring the stability of the operation of the regulating valve.

[0024] When the first pin hole is formed in the tapered hole section and the second pin hole is formed in the tapered column section, the connection of the fixing pin between the valve core and the valve stem does not affect the thread matching structure of the valve core and the valve stem.

[0025] In the bellows assembly, by forming a stepped hole structure at the first connecting portion and the second connecting portion at opposite ends of the bellows, the coaxiality of the bellows installation can be improved, and the welding quality and welding efficiency between the bellows and the connecting sleeve can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of a vacuum regulating valve provided in one embodiment of the present application;

[0028] Figure 2 It is a schematic diagram of the internal structure of a vacuum regulating valve provided in one embodiment of the present application;

[0029] Figure 3 yes Figure 2 The enlarged view of point A in the middle;

[0030] Figure 4 This is a schematic diagram of the structure of the cooperation between the bellows assembly, the valve core and the valve stem in the vacuum regulating valve provided in one embodiment of the present application;

[0031] Figure 5 yes Figure 4 The enlarged view of point B in the middle;

[0032] Figure 6 This is a schematic diagram of the structure of the valve core and the valve body in the vacuum regulating valve provided in one embodiment of the present application;

[0033] In the figure: 100, vacuum regulating valve; 10, valve body; 11, installation cavity; 12, inlet connection end; 13, outlet connection end; 14 abutment surface; 141, sharp tooth structure; 20, valve core; 21, installation hole; 30, valve stem; 40, fixing pin; 50, actuator; 51, connecting plate; 52, protective cover; 53, motor; 54, transmission assembly; 541, nut; 542, screw; 543, slider; 60, valve cover; 61, installation groove; 70, bellows assembly; 71, bellows; 711, first connecting part; 712, second connecting part; 713, stepped hole structure; 72, connecting sleeve; 81, first sealing ring; 82, second sealing ring; 83, butterfly spring; 84, serrated metal sealing ring; 85 sealing gasket; 86, elastic retaining ring. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It will be appreciated that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some but not all structures related to the present application are shown in the drawings. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the art without making creative work are within the scope of protection of the present application.

[0035] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0036] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] See also Figure 1 and Figure 2 The present application provides a vacuum regulating valve 100, including a valve body 10, a valve core 20, a valve stem 30, a fixing pin 40 and an actuator 50. The valve core 20 is arranged in the valve body 10, and the valve core 20 has a mounting hole 21 and a first pin hole, and a first thread is formed in the mounting hole 21. The valve stem 30 has a first connecting end and a second connecting end. The second connecting end is connected to the actuator 50. The first connecting end has a second thread and a second pin hole. The second thread cooperates with the first thread. The fixing pin 40 is arranged to pass through the first pin hole and the second pin hole, and the direction of the central axis of the fixing pin 40 intersects with the direction of the central axis of the valve stem 30.

[0040] Please also read Figure 6 The present application does not limit the specific structure of the valve body 10 in the vacuum regulating valve 100. It can be understood that the valve body 10 is formed with a mounting cavity 11, an inlet connection end 12 and an outlet connection end 13, and the valve core 20 and the valve stem 30 are arranged in the mounting cavity 11 of the valve body 10. The mounting cavity 11 and the inlet connection end 12 of the valve body 10 are connected through a through hole, and the valve core 20 cooperates with the through hole. The valve core 20 moves under the drive of the valve stem 30 to adjust the opening of the through hole, thereby adjusting the system pressure. Figure 2 Taking the placement state of the medium vacuum valve as an example, the through hole can be opened on the bottom wall of the installation cavity 11. It should be noted that since the end of the valve core 20 away from the valve stem 30 cooperates with the through hole to adjust the opening of the through hole, it can be understood that the installation hole 21 of the valve core 20 is a blind hole.

[0041] In some embodiments, when the valve body 10 is provided with a through hole that matches the valve core 20, a contact surface 14 is formed on the circumference of the through hole facing the inner side of the valve body 10, a sealing gasket 85 is provided on the contact surface 14, and an elastic retaining ring 86 is also provided on the side of the sealing gasket 85 facing away from the contact surface 14. Figure 6 As shown, the circumferential end surface of the through hole facing the inner side of the valve body 10 is the bottom surface of the installation cavity 11. It can be understood that the abutment surface 14 is the bottom surface of the installation cavity 11. The material of the sealing gasket 85 can be PTFE + 20% nickel powder by weight, which is formed in one step. In this way, the valve core 20 and the valve body 10 are matched in a soft sealing form, which improves the sealing performance of the valve core 20 when sealing the through hole. And by providing an elastic retaining ring 86 on the side of the sealing gasket 85 facing away from the abutment surface 14, the elastic retaining ring 86 can fix the sealing gasket 85 between the elastic retaining ring 86 and the abutment surface 14 to prevent the sealing gasket 85 from shaking. Figure 6 As shown, in some embodiments, a sharp tooth structure 141 is further formed on the abutting surface 14. The number of the sharp tooth structures 141 on the abutting surface 14 can be distributed in a plurality. By providing the sharp tooth structure 141 on the abutting surface 14, the stability of the sealing gasket 85 installed on the abutting surface 14 is further enhanced.

[0042] One end of the valve core 20 is matched with the through hole, and the end of the valve core 20 facing away from the through hole is connected to the valve stem 30, so that the valve stem 30 drives the valve core 20 to move in a direction perpendicular to the central axis of the through hole. It can be understood that the mounting hole 21 and the first pin hole of the valve core 20 are formed at the end of the valve core 20 away from the through hole to connect with the valve stem 30. The first thread is formed in the mounting hole 21, and it can be understood that the first thread is an internal thread.

[0043] Please also read Figure 4 The valve stem 30 has a first connection end and a second connection end, wherein the first connection end has a second thread that matches the first thread. It can be understood that the second thread is an external thread, so that the valve stem 30 is connected to the valve core 20 through a thread. Since the fixing pin 40 passes through the first pin hole on the valve core 20 and the second pin hole on the valve stem 30, it can be understood that after the first connection end of the valve stem 30 matches the mounting hole 21 of the valve core 20, the first pin hole and the second pin hole correspond to each other. Figure 6As shown, in some embodiments, the mounting hole 21 may include a tapered hole section and a threaded hole section, a first thread is formed in the threaded hole section, the threaded hole section is located at the small diameter end of the tapered hole end, and the large diameter end of the tapered hole section forms the opening of the mounting hole 21. Correspondingly, a tapered column section and a threaded column section are formed at the first connection end of the valve stem 30, a second thread of the valve stem 30 is formed in the threaded column section, the threaded column section is located at the small diameter end of the tapered column section, and the tapered column section of the valve stem 30 cooperates with the tapered hole section of the valve core 20. By providing a tapered hole section in the mounting hole 21 of the valve core 20, and correspondingly providing a tapered column section at the first connection end of the valve stem 30, when the valve stem 30 cooperates with the valve core 20, the tapered hole can play a guiding role, and the cooperation of the tapered hole and the tapered column can ensure the coaxiality of the cooperation between the valve stem 30 and the valve core 20.

[0044] In some embodiments, when the mounting hole 21 includes a tapered hole section, and the first connection end is formed with a corresponding threaded column section, the first pin hole on the valve core 20 can be formed in the tapered hole section, and the second section of the valve stem 30 can be formed in the tapered column section. This can prevent the arrangement of the first pin hole and the second pin hole from affecting the first thread and the second thread.

[0045] The direction of the central axis of the fixing pin 40 intersects with the direction of the central axis of the valve stem 30, so that the fixing pin 40 can limit the movement of the valve stem 30 relative to the valve core 20 along the central axis of the valve stem 30 and limit the rotation of the valve stem 30 relative to the valve core 20 along the circumferential direction of the valve stem 30, so as to avoid the risk of separation between the valve stem 30 and the valve core 20. In some embodiments, the fixing pin is an elastic cylindrical pin. By setting the cylindrical pin as an elastic cylindrical pin, the replacement of the valve core 20 or the valve stem 30 is facilitated.

[0046] In some embodiments, the vacuum regulating valve 100 further includes a valve cover 60 and a bellows assembly 70. The valve cover 60 is fixedly connected to the valve body 10 by screws. The valve stem 30 is arranged through the valve cover 60. In order to ensure the sealing performance between the valve stem 30 and the valve cover 60, at least one first sealing ring 81 is arranged between the circumference of the valve stem 30 and the valve cover 60. For example, two sealing rings can be arranged between the valve stem 30 and the valve cover 60, and the two sealing rings are spaced apart along the axial direction of the valve stem 30. The first sealing ring 81 can be an O-ring, but is not limited thereto.

[0047] The bellows assembly 70 includes a bellows 71 and a connecting sleeve 72. The bellows 71 is sleeved outside the valve stem 30, and the first connecting portion 711 and the second connecting portion 712 are respectively provided at opposite ends of the bellows 71. The end surfaces of the first connecting portion 711 and the second connecting portion 712 facing away from the bellows 71 are both formed with a stepped hole structure 713. The first connecting portion 711 of the bellows 71 is connected to the valve core 20, and the second connecting portion 712 is connected to the connecting sleeve 72. The end of the connecting sleeve 72 facing away from the bellows 71 is sleeved and matched with the end of the valve cover 60 facing the valve body 10. It can be understood that the end of the valve core 20 that matches the first connecting portion 711 is formed with a shoulder structure that matches the stepped hole, and the end of the connecting sleeve 72 that matches the second connecting portion 712 is also formed with a shoulder structure that matches the stepped hole. The first connection part 711 and the second connection part 712 are respectively matched with the shoulder structures of the valve core 20 and the connecting sleeve 72, and then connected by self-welding. In the embodiment of the present application, the end surfaces of the first connection part 711 and the second connection part 712 facing away from the end of the bellows 71 are formed with a stepped hole structure 713, so that the coaxiality of the connection between the bellows assembly 70 and the valve core 20 and the connecting sleeve 72 can be guaranteed, and the subsequent welding connection can be accurately positioned, thereby improving the welding quality and welding efficiency.

[0048] One end of the connecting sleeve 72 facing away from the bellows 71 is sleeved and matched with one end of the valve cover 60 facing the valve body 10. Since the bellows assembly 70 is sleeved on the outside of the valve stem 30, and the valve stem 30 is arranged through the valve cover 60, a shoulder structure can be formed on the end of the valve cover 60 facing the valve body 10, and the connecting sleeve 72 is sleeved on the shoulder structure of the valve cover 60, and one end face of the connecting sleeve 72 cooperates with the valve cover 60, and the other end face cooperates with the valve body 10. In order to ensure the sealing between the valve cover 60 and the valve body 10, in some embodiments, a second sealing ring 82 is provided between the end faces of the valve cover 60 and the connecting sleeve 72 that cooperate with each other. The second sealing ring 82 can also be an O-ring, but is not limited to this. One of the end face of the valve cover 60 and the end face of the connecting sleeve 72 is provided with a mounting groove that cooperates with the second sealing ring 82, such as Figure 3 As shown, in the embodiment of the present application, the end face of the valve cover 60 that is provided in cooperation with the second sealing ring 82 is used as an example for explanation. A serrated metal sealing ring 84 can also be provided between the end faces of the connecting sleeve 72 and the valve body 10 that cooperate with each other. By providing a serrated metal sealing ring 84 between the connecting sleeve 72 and the valve body 10, the sealing between them can be guaranteed. And by providing a second sealing ring 82 between the valve cover 60 and the connecting sleeve 72 of the bellows assembly 70, when the bellows 71 is broken, the leakage of materials can be effectively delayed, thereby improving the safety of the use of the regulating valve.

[0049] like Figure 2 and Figure 3As shown, the actuator 50 is connected to the second connection end of the valve stem 30, and is used to drive the valve core 20 to move through the valve stem 30. The specific structure of the actuator 50 is not limited in the embodiment of the present application. For example, in some embodiments, the actuator 50 may include a connecting disk 51 and a protective cover 52 that cooperates with the connecting disk 51. The connecting disk 51 and the protective cover 52 form a protective cavity. The protective cavity is provided with a motor 53 and a transmission assembly 54. One end of the transmission assembly 54 is connected to the output shaft of the motor 53, and the other end is connected to the second connection end of the valve stem 30. The transmission assembly 54 is used to convert the rotational motion output by the motor 53 into linear motion. The embodiment of the present application does not limit the specific structure of the transmission assembly 54. For example, the transmission assembly 54 may be a screw slider 543 structure, but is not limited thereto. In the embodiment of the present application, the transmission assembly 54 is described as a screw slider 543 mechanism. The transmission assembly 54 may include a nut 541 and a screw rod 542. The nut 541 is threadedly matched with the screw rod 542. The nut 541 is connected to the output shaft of the motor 53. The end of the screw rod 542 away from the nut 541 is provided with a slider 543, and the second connection end of the valve stem 30 is connected to the slider 543. It can be understood that a through hole is provided on the connection plate 51 for the valve stem 30 to pass through and connect with the slider 543. The connection end of the valve stem 30 is connected to the slider 543 of the actuator 50 by threading. When the actuator 50 includes a connecting plate 51, the connecting plate 51 is arranged on the side of the valve cover 60 facing away from the valve body 10, and the side of the valve cover 60 facing the connecting plate 51 is provided with a mounting groove 61, and a plurality of butterfly springs 83 can be arranged in the mounting groove 61 to abut between the valve cover 60 and the slider 543 of the actuator 50, thereby eliminating the thread gap between the second connecting end of the valve stem 30 and the actuator 50 and eliminating the positive and reverse stroke difference.

[0050] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A vacuum regulating valve, characterized in that: The vacuum regulating valve comprises: Valve body; A valve core is arranged in the valve body, the valve core has a mounting hole and a first pin hole, and a first thread is formed in the mounting hole; The valve stem has a first connecting end and a second connecting end, the first connecting end has a second thread and a second pin hole, the second thread cooperates with the first thread; A fixing pin is arranged to pass through the first pin hole and the second pin hole, and the direction of the central axis of the fixing pin intersects with the direction of the central axis of the valve stem; An actuator is connected to the second connection end.

2. The vacuum regulating valve according to claim 1, characterized in that: The mounting hole comprises a tapered hole section and a threaded hole section, the first thread is formed in the threaded hole section, the threaded hole section is located at the small diameter end of the tapered hole section, and the large diameter end of the tapered hole section forms the opening of the mounting hole; The first connecting end is formed with a tapered column section and a threaded column section, the second thread is formed on the threaded column section, the threaded column section is located at the small diameter end of the tapered column section, and the tapered column section cooperates with the tapered hole section.

3. The vacuum regulating valve according to claim 2, characterized in that: The first pin hole is formed in the tapered hole section; the second pin hole is formed in the tapered column section.

4. The vacuum regulating valve according to claim 1, characterized in that: The vacuum regulating valve also includes: Valve cover; A bellows assembly comprises a bellows and a connecting sleeve, wherein the bellows is sleeved outside the valve stem, and a first connecting portion and a second connecting portion are respectively provided at opposite ends of the bellows, and end surfaces of the first connecting portion and the second connecting portion facing away from one end of the bellows are both formed with a stepped hole structure, the first connecting portion is connected to the valve core, the second connecting portion is connected to the connecting sleeve, and the connecting sleeve is sleeved with the valve cover.

5. The vacuum regulating valve according to claim 4, characterized in that: The valve stem passes through the valve cover, and at least one first sealing ring is arranged between the circumference of the valve stem and the valve cover.

6. The vacuum regulating valve according to claim 5, characterized in that: A second sealing ring is arranged between the end surfaces of the valve cover and the connecting sleeve that cooperate with each other.

7. The vacuum regulating valve according to claim 4, characterized in that: The actuator is threadedly connected to the second connection end, and a plurality of butterfly springs are arranged between the actuator and the valve cover, and the butterfly springs are used to eliminate the thread gap between the second connection end and the actuator.

8. The vacuum regulating valve according to claim 1, characterized in that: The fixing pin is an elastic cylindrical pin.

9. The vacuum regulating valve according to claim 1, characterized in that: The valve body is provided with a through hole cooperating with the valve core, the through hole forms an abutment surface in the circumferential direction of one side of the valve body, a sealing gasket is provided on the abutment surface, and an elastic retaining ring is also provided on the side of the sealing gasket facing away from the abutment surface.

10. The vacuum regulating valve according to claim 9, characterized in that: A sharp tooth structure is formed on the abutting surface.

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