All-metal baffle valve

Abstract

The all-metal baffle valve comprises a valve body, and a valve cover is tightly pressed at the top end of the valve body; the metal sealing mechanism comprises a sealing block and a sealing corrugated pipe, the sealing block is arranged at an inlet of the fluid channel of the valve body, the sealing corrugated pipe is connected with the upper end of the sealing block, the contact part between the valve body and the sealing block is in metal sealing, and the sealing corrugated pipe and the valve body are in metal sealing through a sealing gasket; a pressing block is assembled above the guide mechanism, and the valve cover presses the guide mechanism on the upper end face of the sealing corrugated pipe through the pressing block; the upper end of the transmission mechanism extends out of the valve cover, and the lower end of the transmission mechanism penetrates through the guide mechanism and is connected with the sealing corrugated pipe. The problems that in the prior art, the high temperature resistance is poor, the sealing performance is unstable, and the service life is short can be solved.

Description

Technical Field

[0001] This application relates to the field of vacuum system pipeline control technology, specifically to an all-metal baffle valve. Background Technology

[0002] Vacuum valves are an essential type of valve in vacuum systems. To achieve ultra-high or extremely high vacuum levels, vacuum systems require high-temperature baking and have high sealing performance requirements. Therefore, the existing conventional vacuum valves with rubber ring sealing structures cannot meet the requirements, and metal sealing structures are required. The all-metal baffle valve in vacuum valves uses metal materials for both dynamic and static sealing positions, and can withstand high-temperature baking of 300°C. It is widely used in industrial or scientific research fields such as accelerators and aerospace.

[0003] Currently, the all-metal baffle valves used in the domestic market include: 1. Imported VAT all-metal baffle valves (VAT is a multinational company headquartered in Switzerland that focuses on high-performance high-end vacuum valves). Imported VAT all-metal baffle valves are expensive and have long delivery times, making it easy to be hampered by supply chain bottlenecks; 2. VAT products or self-developed products imitated by other domestic manufacturers. These have poor high-temperature resistance, unstable sealing performance, and short service life, and therefore have not been widely used. Utility Model Content

[0004] In view of this, the main objective of this application is to provide an all-metal baffle valve that can help solve the problems of poor high-temperature resistance, unstable sealing performance, and short service life in the prior art.

[0005] This application provides an all-metal baffle valve, comprising:

[0006] The valve body has a valve cover pressed against its top;

[0007] A metal sealing mechanism includes a sealing block located at the fluid passage inlet of the valve body and a sealing bellows connected to the upper end of the sealing block, wherein the contact area between the valve body and the sealing block is metal sealed, and the sealing bellows and the valve body are metal sealed by a sealing gasket.

[0008] The guide mechanism is equipped with a pressure block on top, and the valve cover presses the guide mechanism against the upper end face of the sealing bellows through the pressure block.

[0009] The transmission mechanism has its upper end extending out of the valve cover, and its lower end passes through the inside of the guide mechanism and connects to the sealing bellows.

[0010] As described above, the contact area between the valve body and the sealing block uses a metal seal, and the sealing bellows and the valve body are sealed with a metal gasket, which provides a more reliable sealing effect. The metal sealing mechanism can maintain good sealing performance in high-temperature environments and is suitable for vacuum systems that require high-temperature baking. The guide mechanism ensures the coaxiality between the valve body, sealing block, sealing bellows, guide mechanism and transmission mechanism, preventing the sealing block from shifting or getting stuck during opening and closing, reducing uneven wear caused by shifting, thereby extending service life, improving the overall stability of the all-metal baffle valve, ensuring the sealing performance and reliability of the all-metal baffle valve, and ensuring that when the sealing block is opened and closed again under the action of the transmission mechanism, it can be closed at the same sealing line position at the fluid channel inlet of the valve body.

[0011] Optionally, the sealing bellows and the valve body are sealed by a metal sealing gasket, including: a first retaining ring is provided at the upper end of the sealing bellows, and a sealing gasket is assembled around the lower end of the first retaining ring.

[0012] As described above, a first retaining ring is set at the upper end of the sealing bellows, and a sealing gasket is assembled around the lower end of the first retaining ring, so that the sealing bellows and the valve body can achieve metal sealing through the sealing gasket; the sealing gasket ensures that the contact surface between the sealing bellows and the valve body is subjected to uniform force, thereby enhancing the sealing performance; in addition, the sealing gasket also reduces the direct friction between the sealing bellows and the valve body, thus extending the service life of the all-metal baffle valve.

[0013] Optionally, a groove is provided in the middle of the top of the sealing block, a first connecting hole is provided on the periphery of the middle part of the sealing block, and a bevel structure is provided on the periphery of the lower end of the sealing block.

[0014] Based on the above, the shape of the groove is set according to the connection between the sealing bellows and the sealing block. The first connecting hole set around the perimeter of the sealing block enhances the connection stability between the sealing bellows and the sealing block. The inclined structure set at the lower end of the sealing block can enhance the sealing performance between the sealing block and the valve body.

[0015] Optionally, the guiding mechanism includes a guide sleeve, which is fitted onto the inner wall of the upper end of the sealed bellows. A limit groove is provided at the lower end of the guide sleeve along its axial direction, and a pressure block is assembled at the upper end of the guide sleeve.

[0016] As described above, the guide sleeve starts from the top of the sealing bellows and fits along the inner wall of the sealing bellows, providing a precise vertical path guide for the sealing block and ensuring that the sealing block remains coaxial during opening and closing, preventing offset and jamming. Under the motion force of the transmission mechanism, the limiting groove prevents the guide sleeve from rotating left and right. The pressure block is set at the top of the guide sleeve, and the pressure applied by the valve cover firmly fixes the guide sleeve inside the sealing bellows, preventing the guide sleeve from moving up and down. The limiting groove and the pressure block together ensure the stability of the guide sleeve.

[0017] Optionally, the transmission mechanism includes: a locking screw, the upper end of which extends out of the valve cover, the portion of the upper end of which extends out of the valve cover being a hexagonal knob, and the lower end of the locking screw being hollow and having a first thread; and a bearing, which is sleeved in the middle of the locking screw and located inside the valve cover.

[0018] As shown above, the lower end of the locking screw is hollow and the first thread is an internal thread. The bearing in the middle of the locking screw allows the locking screw to be fixed inside the valve body and rotate. The locking screw precisely controls the opening and closing of the sealing block, ensuring that the sealing block returns to the same sealing line position accurately each time it is closed. The design of the locking screw makes the transmission mechanism more compact and simple, reduces the use of complex parts, and lowers costs.

[0019] Optionally, a first connecting block is provided in the middle of the outer side of the bottom end of the sealing bellows, and a second connecting hole is provided on the first connecting block. The first connecting block is assembled in the groove in the sealing block, and the second connecting hole corresponds to and cooperates with the first connecting hole in the sealing block.

[0020] A second connecting block is provided inside the bottom end of the sealed bellows, and a limit block is provided at the upper end of the second connecting block. The limit block cooperates with the limit groove.

[0021] The top of the second connecting block is fixedly connected to the third connecting block, and the third connecting block is provided with a second thread, wherein the second thread mates with the first thread.

[0022] As described above, the first connecting block at the bottom of the sealing bellows is adapted to the groove at the top of the sealing block, and the second connecting hole on the first connecting block is adapted to the first connecting hole in the sealing block, ensuring and enhancing the connection stability between the sealing bellows and the sealing block; the limiting block set on the second connecting block at the lower end of the sealing bellows is adapted to the limiting groove on the guide sleeve, which can prevent the guide sleeve from rotating left and right; the second thread on the third connecting block at the upper end of the sealing bellows is an external thread, and the third connecting block is fitted inside the hollow bottom end of the locking screw. The third connecting block is threadedly connected to the locking screw. Under the rotational force of the locking screw, the sealing bellows moves vertically through the cooperation of the external thread and the internal thread.

[0023] Optionally, the fluid passage inlet of the valve body is provided with a stepped structure, and the inclined structure and the stepped structure are sealed with metal.

[0024] As shown above, the inclined structure achieves a contact line seal between the sealing block and the valve body, ensuring better sealing performance and replacing the need for a rubber sealing ring.

[0025] Optionally, a pressure block is fitted on the upper end of the guide sleeve, including: a second retaining ring is provided on the upper end of the guide sleeve, and a pressure block is fitted on the upper end of the second retaining ring.

[0026] As shown above, the second retaining ring provides support for the guide sleeve, so that the upper end of the guide sleeve is initially positioned on the inner wall of the sealing bellows; the combination of the second retaining ring and the pressure block ensures that the guide sleeve is firmly fixed under the valve cover, preventing it from shifting up and down or loosening during operation, and enhancing the stability of the overall structure.

[0027] Optionally, the sealing block is made of high-temperature resistant metal; the sealing gasket is made of high-temperature resistant metal.

[0028] As a result, high-temperature resistant metal materials can maintain their physical and mechanical properties under extreme temperature conditions (such as baking at 300℃), ensuring that the sealing block can still provide a reliable sealing effect in high-temperature environments, and also ensuring good metal sealing performance between the sealing bellows and the valve body in high-temperature environments.

[0029] Optionally, connecting flanges are provided on the side and bottom of the valve body.

[0030] As shown above, the connecting flange on the bottom side of the valve body is located at the inlet of its fluid passage, and the connecting flange on the side of the valve body is located at the outlet of its fluid passage. The connecting flanges enable the valve body's fluid passage outlet and inlet to be connected to other equipment, simplifying the installation and maintenance of this all-metal baffle valve and improving the ease of connection.

[0031] In summary, the all-metal baffle valve provided in this application features a sealing block made of high-temperature resistant metal, located at the fluid channel inlet of the valve body, achieving a metal seal with the valve body through a beveled structure. A sealing bellows is positioned above the sealing block, and a metal seal is achieved between the bellows and the valve body via a sealing gasket (also made of high-temperature resistant metal). A guide sleeve is fitted onto the inner wall of the upper end of the sealing bellows, and is fixed below the valve cover by a pressure block. The guide sleeve is limited by a limiting groove on a limiting block inside the sealing bellows, ensuring coaxiality and stability among the valve body, sealing block, sealing bellows, guide sleeve, and locking screw, thus extending service life. Tightening the locking screw controls the vertical movement of the sealing bellows, thereby driving the opening and closing of the sealing block, ensuring that the sealing block accurately returns to the same sealing line position each time it closes. This all-metal baffle valve is made entirely of high-temperature resistant metal and is suitable for vacuum systems requiring high-temperature baking. Attached Figure Description

[0032] The various technical features of this application and their relationships will be further explained below with reference to the accompanying drawings. The drawings are exemplary; some technical features are not shown to scale, and some drawings may omit technical features commonly used in the art to which this application pertains that are not essential for understanding and implementing this application, or additionally show technical features that are not essential for understanding and implementing this application. In other words, the combination of various technical features shown in the drawings is not intended to limit this application. Furthermore, throughout this application, the same reference numerals refer to the same things. Specific descriptions of the drawings are as follows:

[0033] Figure 1 This is a cross-sectional view of an all-metal baffle valve according to this application;

[0034] Figures 2a-2b This is a structural diagram of a sealing block in an all-metal baffle valve according to this application;

[0035] Figure 3 This is a perspective view of a sealing bellows in an all-metal baffle valve according to this application;

[0036] Figure 4 This is a structural diagram of a sealing gasket in an all-metal baffle valve according to this application;

[0037] Figures 5a-5c This is a structural diagram of the guide sleeve in an all-metal baffle valve according to this application;

[0038] Figure 6 This is a structural diagram of the pressure block in an all-metal baffle valve according to this application;

[0039] Figures 7a-7b This is a structural diagram of the locking screw in an all-metal baffle valve according to this application.

[0040] Explanation of reference numerals in the attached figures

[0041] 1-Valve body, 2-Sealing block, 201-Groove, 202-First connecting hole, 203-Sloping structure, 3-Sealing bellows, 301-First connecting block, 3011-Second connecting hole, 302-Second connecting block, 3021-Limiting block, 303-Third connecting block, 304-First retaining ring, 4-Sealing gasket, 5-Guide sleeve, 501-Second retaining ring, 502-Limiting groove, 6-Pressure block, 7-Locking screw, 701-Hexagonal knob, 702-Bearing connection, 8-Valve cover, 9-Connecting flange, 10-Bearing.

[0042] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0043] The preferred embodiments of this application will now be described in detail with reference to the accompanying drawings, so that the advantages and features of this application can be more easily understood by those skilled in the art, thereby providing a clearer and more definite definition of the scope of protection of this application.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0045] It should be noted that in the description herein, the terms "middle," "front," "back," "top," "bottom," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0046] Furthermore, the terms "installation," "setting," "sleeving," "connection," "assembly," "sleeving," etc., should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral structures; they can refer to mechanical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0047] The technical solutions of this application and how they solve the aforementioned technical problems will be described in detail below with specific embodiments. The specific embodiments described below can be combined with each other to form new embodiments. The same or similar ideas or processes described in one embodiment may not be repeated in other embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0048] like Figure 1As shown in Figure 7, this application provides an all-metal baffle valve, which includes:

[0049] Valve body 1, with valve cover 8 pressed against its top;

[0050] The metal sealing mechanism includes a sealing block 2 located at the fluid passage inlet of the valve body 1 and a sealing bellows 3 connected to the upper end of the sealing block 2, wherein the contact part between the valve body 1 and the sealing block 2 is metal sealed, and the sealing bellows 3 and the valve body 1 are metal sealed by a sealing gasket 4.

[0051] The guide mechanism is equipped with a pressure block 6 on its upper part. The valve cover 8 presses the guide mechanism against the upper end face of the sealing bellows 3 through the pressure block 6.

[0052] The transmission mechanism has its upper end extending out of the valve cover 8, and its lower end passes through the inside of the guide mechanism and connects to the sealing bellows 3.

[0053] Specifically, the contact area between the valve body 1 and the sealing block 2 adopts a metal seal, and the sealing bellows 3 and the valve body 1 are sealed by a metal gasket 4, which can provide a more reliable sealing effect. The metal sealing mechanism can maintain good sealing performance in high-temperature environments and is suitable for vacuum systems that require high-temperature baking. The guide mechanism ensures the coaxiality between the valve body 1, the sealing block 2, the sealing bellows 3, the guide mechanism and the transmission mechanism, preventing the sealing block 2 from shifting or getting stuck during opening and closing, reducing uneven wear caused by shifting, thereby extending the service life, improving the overall stability of the all-metal baffle valve, ensuring the sealing performance and reliability of the all-metal baffle valve, and ensuring that when the sealing block 2 is opened and closed again under the action of the transmission mechanism, it can be closed at the same sealing line position at the fluid channel inlet of the valve body 1.

[0054] Optionally, a groove 201 is provided in the middle of the top of the sealing block 2, a first connecting hole 202 is provided on the periphery of the middle part of the sealing block 2, and a slope structure 203 is provided on the periphery of the lower end of the sealing block 2.

[0055] Specifically, the shape of the groove 201 is set according to the connection between the sealing bellows 3 and the sealing block 2. The first connection hole 202 set around the sealing block 2 enhances the connection stability between the sealing bellows 3 and the sealing block 2. The inclined structure 203 set at the lower end of the sealing block 2 can enhance the sealing performance between the sealing block 2 and the valve body 1.

[0056] Optionally, a stepped structure is provided at the fluid passage inlet of the valve body 1, and the inclined structure 203 is metal-sealed with the stepped structure.

[0057] Specifically, the inclined structure 203 achieves a contact line seal between the sealing block 2 and the valve body 1, ensuring better sealing performance and replacing the presence of a rubber sealing ring.

[0058] like Figures 2a-2b The sealing block 2 shown has a circular groove 201 at its top. Four first connecting holes 202 are respectively arranged opposite each other and penetrate the side of the groove 201. Two of the opposite first connecting holes 202 have a large diameter, and the other two have a small diameter. The large-diameter first connecting holes 202 are stepped holes, with the larger hole on the outside and the smaller hole adjacent to the groove 201. A beveled structure 203 is provided at the bottom of the sealing block 2. The bend in the stepped structure at the fluid passage inlet of the valve body 1 contacts the beveled structure 203, achieving a metal-line seal between the sealing block 2 and the valve body 1.

[0059] It should be noted that, in this application, line seal specifically refers to the contact between the sharp corner of the stepped structure at the fluid passage inlet of the valve body 1 and the inclined structure 203 around the sealing block 2, which is a circular line contact; since both the stepped structure and the inclined structure 203 are made of high-temperature metal, the sealing state presented by the line contact between the two can be called metal seal or metal line seal.

[0060] Optionally, a first connecting block 301 is provided in the middle of the outer side of the bottom end of the sealing bellows 3. A second connecting hole 3011 is provided on the first connecting block 301. The first connecting block 301 is assembled in the groove 201 in the sealing block 2. The second connecting hole 3011 is correspondingly engaged with the first connecting hole 202 in the sealing block 2.

[0061] A second connecting block 302 is provided inside the bottom end of the sealed bellows 3, and a limit block 3021 is provided on the upper end of the second connecting block 302. The limit block 3021 cooperates with the limit groove 502.

[0062] The top of the second connecting block 302 is fixedly connected to the third connecting block 303, and the third connecting block 303 is provided with a second thread, wherein the second thread mates with the first thread.

[0063] Specifically, the first connecting block 301 at the bottom of the sealing bellows 3 is adapted to the groove 201 at the upper end of the sealing block 2, and the second connecting hole 3011 on the first connecting block 301 is adapted to the first connecting hole 202 in the sealing block 2, ensuring and enhancing the connection stability between the sealing bellows 3 and the sealing block 2; the limiting block 3021 provided on the second connecting block 302 at the lower end of the sealing bellows 3 is adapted to the limiting groove 502 on the guide sleeve 5, which can prevent the guide sleeve 5 from rotating left and right; the second thread on the third connecting block 303 at the upper end of the sealing bellows 3 is an external thread, and the third connecting block 303 is fitted inside the hollow interior of the bottom end of the locking screw 7. The third connecting block 303 is threadedly connected to the locking screw 7. Under the rotational force of the locking screw 7, the sealing bellows 3 moves vertically through the cooperation of the external thread and the internal thread.

[0064] Optionally, the sealing bellows 3 and the valve body 1 are sealed by a metal seal 4, including: a first retaining ring 304 is provided at the upper end of the sealing bellows 3, and a sealing gasket 4 is assembled around the lower end of the first retaining ring 304.

[0065] Specifically, a first retaining ring 304 is provided at the upper end of the sealing bellows 3, and a sealing gasket 4 is assembled around the lower end of the first retaining ring 304, so that the sealing bellows 3 and the valve body 1 achieve metal sealing through the sealing gasket 4; the sealing gasket 4 ensures that the contact surface between the sealing bellows 3 and the valve body 1 is subjected to uniform force, thereby enhancing the sealing performance; in addition, the sealing gasket 4 also reduces the direct friction between the sealing bellows 3 and the valve body 1, thereby extending the service life of the all-metal baffle valve.

[0066] like Figure 3 The diagram shows a perspective view of the sealing bellows 3. A first retaining ring 304 is provided at the upper end of the sealing bellows 3, and a sealing gasket 4 is fitted around the lower end face of the first retaining ring 304. The sealing gasket 4 is annular in shape. Figure 4 As shown. A first connecting block 301 is provided on the outer side of the lower end of the sealing bellows 3, and a second connecting block 302 is provided on the inner side of the lower end of the sealing bellows 3. The first connecting block 301 and the second connecting block 302 are integrally formed. A third connecting block 303 is provided on the upper end of the second connecting block 302, and the second connecting block 302 and the third connecting block 303 are integrally formed by a thin shaft. A limit block 3021 is provided on the upper end of the second connecting block 302. The diameter of the hole in the second connecting block 302 is larger than the diameter of the hole in the first connecting block 301. The first connecting block 301, the second connecting block 302 and the third connecting block 303 are all cylindrical, but their lengths are different. Four symmetrically distributed second connecting holes 3011 are provided on the periphery of the first connecting block 301, and the second connecting holes 3011 are corresponding to the first connecting holes 202 on the sealing block 2.

[0067] In addition, due to the cylindrical structure of the first connecting block 301, the groove 201 at the upper end of the sealing block 2 is also a cylindrical empty groove. However, when the shape of the first connecting block 301 changes, the shape of the groove 201 also changes accordingly.

[0068] Optionally, the guiding mechanism includes a guide sleeve 5, which is sleeved on the inner side wall of the upper end of the sealed bellows 3. A limit groove 502 is provided at the lower end of the guide sleeve 5 along its axial direction, and a pressure block 6 is assembled at the upper end of the guide sleeve 5.

[0069] Specifically, the guide sleeve 5 starts from the upper end of the sealing bellows 3 and fits along the inner wall of the sealing bellows 3, providing a precise vertical path guide for the sealing block 2, ensuring that the sealing block 2 remains coaxial during opening and closing, and preventing offset and jamming; under the motion force of the transmission mechanism, the setting of the limiting groove 502 can prevent the guide sleeve 5 from rotating left and right; the pressure block 6 is set at the upper end of the guide sleeve 5, and the pressure applied by the valve cover 8 firmly fixes the guide sleeve 5 inside the sealing bellows 3, preventing the guide sleeve 5 from moving up and down. The limiting groove 502 and the pressure block 6 together ensure the stability of the guide sleeve 5.

[0070] Optionally, the upper end of the guide sleeve 5 is equipped with a pressure block 6, including: a second retaining ring 501 is provided at the upper end of the guide sleeve 5, and the pressure block 6 is assembled at the upper end of the second retaining ring 501.

[0071] Specifically, the second retaining ring 501 provides support for the guide sleeve 5, so that the upper end of the guide sleeve 5 is initially positioned on the inner wall of the sealing bellows 3; the combination of the second retaining ring 501 and the pressure block 6 ensures that the guide sleeve 5 is firmly fixed under the valve cover 8, preventing it from shifting up and down or loosening during operation, and enhancing the stability of the overall structure.

[0072] like Figure 5a The structural diagram of the guide sleeve 5 shown and Figure 5b As shown in the cross-sectional view, a second retaining ring 501 is provided at the upper end of the guide sleeve 5. The second retaining ring 501 has rounded corners. A limiting groove 502 is provided on the cylindrical part at the lower end of the guide sleeve 5. The limiting groove 502 cooperates with the limiting block 3021 to prevent the guide sleeve 5 from rotating left or right. Figure 5c The front view of the guide sleeve 5 shown shows that the limiting groove 502 is an elongated through groove. In this all-metal baffle valve, the valve cover 8 presses the guide sleeve 5 against the first retaining ring 304 of the sealing bellows 3 through the pressure block 6 on the upper end face of the second retaining ring 501. The pressure block 6 is annular and relatively thick. Figure 6 As shown.

[0073] Optionally, the transmission mechanism includes: a locking screw 7, the upper end of which extends out of the valve cover 8, the part of the upper end of the locking screw 7 extending out of the valve cover 8 being a hexagonal knob 701, the lower end of the locking screw 7 being hollow and having a first thread; and a bearing 10, which is sleeved in the middle of the locking screw 7 and located inside the valve cover 8.

[0074] Specifically, the lower end of the locking screw 7 is hollow and the first thread is an internal thread. The bearing 10, which is fitted in the middle of the locking screw 7, allows the locking screw 7 to be fixed inside the valve body 1 and rotate. The locking screw 7 precisely controls the opening and closing of the sealing block 2, ensuring that the sealing block 2 can accurately return to the same sealing line position each time it is closed. The design of the locking screw 7 makes the transmission mechanism more compact and simple, reduces the use of complex parts, and lowers costs.

[0075] like Figures 7a-7b The structural diagram and cross-sectional view of the locking screw 7 shown herein indicate that the part of the upper end of the locking screw 7 extending out of the valve cover 8 can be configured as a hexagonal knob 701, or it can be configured as a square, pentagonal, or octagonal knob, or a vertically textured knob that is convenient for manual touch by the operator. This application is only for illustrative purposes and does not impose any other specific restrictions on the shape of the part of the upper end of the locking screw 7 extending out of the valve cover 8.

[0076] like Figure 7a As shown, a thin annular groove directly below the hexagonal knob 701 can be locked at the middle position of the upper end of the valve cover 8. Below the annular groove is the bearing connection 702, which is used to ring the bearing 10. The bearing 10 is inside the valve cover 8 and fixed below the lower end face of the valve cover 8. When the hexagonal knob 701 is rotated, the locking screw 7 rotates under the action of the bearing 10. Below the bearing connection 702 is a hollow connection structure with internal threads. The outer diameter of this connection structure is larger than the outer diameter of the bearing connection 702. This connection structure is threadedly connected to the third connecting member inside the sealing bellows 3. When the hexagonal knob 701 is rotated, the locking screw 7 rotates under the action of the bearing 10. The interaction between the internal and external threads causes the third connecting member to rise or fall when the connection structure rotates.

[0077] like Figure 7b As shown, the hollow cross-section inside the connecting structure is T-shaped, with an internal thread at the lower end of the T-shape. The total inner diameter of the lower end of the T-shape and the internal thread is equal to the inner diameter of the upper end of the T-shape. The upper end of the T-shape provides space for the third connecting block 303, which also improves the sealing effect.

[0078] Optionally, the sealing block 2 is made of high-temperature resistant metal; the sealing gasket 4 is made of high-temperature resistant metal.

[0079] Specifically, the high-temperature resistant metal material can maintain its physical and mechanical properties under extreme temperature conditions (such as baking at 300°C), ensuring that the sealing block 2 can still provide a reliable sealing effect in high-temperature environments, and also ensuring good metal sealing performance between the sealing bellows 3 and the valve body 1 in high-temperature environments.

[0080] Optionally, connecting flanges 9 are provided on the side and bottom of the valve body 1.

[0081] Specifically, the connecting flange 9 on the bottom side of the valve body 1 is located at the inlet of its fluid passage, and the connecting flange 9 on the side of the valve body 1 is located at the outlet of its fluid passage. The connecting flange 9 enables the fluid passage outlet and inlet of the valve body 1 to be connected to other equipment, which simplifies the installation and maintenance of the all-metal baffle valve and improves the convenience of connection.

[0082] In such Figure 1 In the embodiment shown, the all-metal baffle valve mainly includes a valve body 1, a sealing block 2, a sealing bellows 3, a sealing gasket 4, a guide sleeve 5, a pressure block 6, a locking screw 7, a valve cover 8, and a connecting flange 9.

[0083] by Figure 1Taking the orientation as an example, the left side of valve body 1 is the fluid outflow channel, and the bottom side of valve body 1 is the fluid inflow channel. Connecting flanges 9 are installed at both the fluid inlet and outlet of the fluid channel in valve body 1. These connecting flanges 9 are interface flanges for connecting to other equipment. In the fluid inflow channel at the lower end of valve body 1, at the point where the fluid turns from the lower end into the outflow channel on the left side of valve body 1 (i.e., the inflection point of the fluid inflow channel), a stepped structure, also known as a first-stage stepped structure, is provided inside valve body 1. The bottom perimeter of sealing block 2 is provided with a beveled structure. When the all-metal baffle valve is in the closed state, the beveled structure of sealing block 2 contacts the first-stage stepped structure inside valve body 1, forming a contact line seal. Since both are made of high-temperature resistant metal, a metal seal between sealing block 2 and valve body 1 can be achieved. An additional first retaining ring extends from the top of the sealing bellows 3. The lower end face of the first retaining ring... A sealing gasket 4 is provided between the valve body 1 and the valve body 1. The sealing gasket 4 is made of high-temperature resistant metal, which can ensure the sealing performance between the sealing bellows 3 and the inside of the valve body 1. This demonstrates the design that the valve body 1 and the sealing bellows 3 achieve a metal seal through the sealing gasket 4. The sealing bellows 3 is provided with cylindrical first connecting block, second connecting block and third connecting block from bottom to top. The ambiguous connecting block is located outside the bottom end of the sealing bellows 3, and the second connecting block and the third connecting block are located inside the sealing bellows 3. The second connecting block is located below the third connecting block, and the diameter of the second connecting block is larger than the diameter of the third connecting block. This ensures that after the limiting block on the second connecting block connects with the limiting groove on the guide sleeve, the guide sleeve will not obstruct the locking screw from driving the third connecting block to rotate. The outer circumference of the sealing bellows 3 is provided with metal corrugations. When the locking screw drives the third connecting block upwards, it causes the metal corrugations to stack and rise, thereby causing the first connecting block to move upwards. The guide sleeve 5 is hollow inside, and the lower end of the guide sleeve 5 has an axially extending limiting groove starting from the bottom side. The guide sleeve 5 is set tightly against the inner wall of the sealing bellows 3 until the limiting groove on the guide sleeve 5 is assembled with the limiting block inside the sealing bellows 3, thus ensuring the guide... The second retaining ring at the upper end of the sleeve 5 is precisely engaged with the first retaining ring of the sealing bellows 3. A pressure block 6 is provided at the upper end of the second retaining ring of the guide sleeve 5. The valve cover 8 is screwed to the upper end of the valve body 1. The valve cover 8 presses the guide sleeve 5 through the pressure block 6. The hexagonal knob at the upper end of the locking screw 7 extends out of the valve cover 8 for easy manual rotation by the operator. The lower end of the locking screw 7 passes through the interior of the sealing bellows 3, and the hollow interior of the lower end of the locking screw 7 is threadedly connected to the third connecting block. By turning the locking screw 7, the sealing bellows 3 is driven to move up and down, thereby opening and closing the sealing block 2 and achieving a metal seal between the sealing block 2 and the valve body 1.This structure ensures that the valve body 1, sealing block 2, sealing bellows 3, guide sleeve 5, and valve cover 8 are coaxial. This ensures that when the sealing block 2 is opened and then closed again, it can be closed at the same sealing line position. That is, the sealing position between the sealing block 2 and the valve body 1 remains unchanged, and it will be at the same sealing line position every time it is closed.

[0084] In the above embodiment, since a stepped structure is also provided at the upper end of the valve body 1, the lower end face of the sealing gasket 4 is located on the stepped surface, and the upper end face of the sealing gasket 4 is located at the lower end face of the first retaining ring at the upper end of the sealing bellows 3. Through the pressure of the valve cover 8, the upper and lower end faces of the sealing gasket 4 are in close contact with the sealing bellows 3 and the valve body 1 respectively, thereby enabling the sealing gasket 4 to reflect the metal seal design between the valve body 1 and the sealing bellows 3.

[0085] In summary, the all-metal baffle valve provided in this application has a sealing block 2 made of high-temperature resistant metal, located at the fluid channel inlet of the valve body 1, achieving a metal seal with the valve body 1 through an inclined structure 203; a sealing bellows 3 is positioned above the sealing block 2, and a metal seal is achieved between the sealing bellows 3 and the valve body 1 through a sealing gasket 4 (also made of high-temperature resistant metal); a guide sleeve 5 is fitted onto the inner wall of the upper end of the sealing bellows 3, and the guide sleeve 5 is fixed below the valve cover 8 by a pressure block 6. The limiting groove 502 restricts the limiting block 3021 inside the sealing bellows 3, ensuring the coaxiality and stability between the valve body 1, sealing block 2, sealing bellows 3, guide sleeve 5 and locking screw 7, thus extending service life. The vertical movement of the sealing bellows 3 is controlled by turning the locking screw 7, which in turn drives the opening and closing of the sealing block 2, ensuring that the sealing block 2 can accurately return to the same sealing line position each time it is closed. This all-metal baffle valve is made entirely of high-temperature resistant metal material and is suitable for vacuum systems that require high-temperature baking.

[0086] Unless otherwise defined, all technical and scientific terms used throughout this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. In case of any inconsistency, the meaning as stated in this application or derived from the content described herein shall prevail. Furthermore, the terminology used in this description is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0087] Note that the above are merely preferred embodiments and the technical principles employed in this application. Those skilled in the art will understand that this application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of this application. Therefore, although this application has been described in detail through the above embodiments, this application is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the technical concept of this application, all of which fall within the scope of protection of this application.

[0088] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An all-metal flapper valve characterized by, The utility model relates to a valve body, the top end of which is pressed against a valve cover; A metal sealing mechanism, which comprises a sealing block arranged at the fluid passage inlet of the valve body and a sealing bellows connected to the upper end of the sealing block, wherein the contact part between the valve body and the sealing block is metal sealed, and the sealing bellows and the valve body are metal sealed by arranging a sealing gasket therebetween; A guide mechanism, the upper end of which is fitted with a pressing block, and the valve cover presses the guide mechanism against the upper end face of the sealing bellows through the pressing block; A transmission mechanism, the upper end of which protrudes out of the valve cover, and the lower end of which penetrates through the inside of the guide mechanism and is connected to the sealing bellows. The sealing bellows and the valve body are metal sealed by arranging a sealing gasket therebetween, which comprises:

2. The all-metal flapper valve of claim 1, wherein, The upper end of the sealing bellows is provided with a first stop ring, and the lower end of the first stop ring is fitted with the sealing gasket. The top end of the sealing block is provided with a groove in the middle, the middle part of the sealing block is provided with a first connecting hole on the lateral side, and the lower end of the sealing block is provided with a bevel structure on the lateral side.

3. The all-metal flapper valve of claim 2, wherein, The guide mechanism comprises a guide sleeve, which is sleeved on the inner lateral wall of the upper end of the sealing bellows, the lower end of the guide sleeve is provided with a limiting groove along the axial direction thereof, and the upper end of the guide sleeve is fitted with the pressing block.

4. The all-metal flapper valve of claim 3, wherein, The transmission mechanism comprises:

5. The all-metal flapper valve of claim 4, wherein, A locking screw, the upper end of which protrudes out of the valve cover, the part of the upper end of the locking screw that protrudes out of the valve cover is a hexagonal knob, the lower end of the locking screw is hollow inside and is provided with a first thread; A bearing, which is sleeved on the middle part of the locking screw and is located inside the valve cover. The bottom end of the sealing bellows is provided with a first connecting block in the middle of the outer part, the first connecting block is fitted in the groove in the sealing block, and the first connecting block is provided with a second connecting hole, which corresponds to the first connecting hole in the sealing block; 6. The all-metal flapper valve of claim 5, wherein, The bottom end of the sealing bellows is provided with a second connecting block inside, the upper end of the second connecting block is provided with a limiting block, and the limiting block corresponds to the limiting groove; The upper end of the second connecting block is fixedly connected with a third connecting block, and the third connecting block is provided with a second thread, wherein the second thread corresponds to the first thread. The fluid passage inlet of the valve body is provided with a step structure, and the bevel structure is metal sealed with the step structure.

7. The all-metal flapper valve of claim 3, wherein, The upper end of the guide sleeve is fitted with the pressing block, which comprises:

8. The all-metal flapper valve of claim 4, wherein, The upper end of the guide sleeve is provided with a second stop ring, and the upper end of the second stop ring is fitted with the pressing block. The sealing block is made of high-temperature-resistant metal material, and the sealing gasket is made of high-temperature-resistant metal material.

9. The all-metal flapper valve of claim 5, wherein, The side surface and the bottom side of the valve body are provided with a connecting flange.

10. The all-metal flapper valve of claim 1, wherein, ​

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