Vacuum stop valve suitable for powder medium working condition

Abstract

The invention belongs to the technical field of vacuum pipelines, and particularly relates to a vacuum stop valve suitable for powder medium working conditions. The vacuum stop valve comprises a valve seat, a valve core and a hand wheel, a channel used for being connected with a pipeline is formed in the valve seat. The valve element is arranged in the channel and used for sealing the channel. The hand wheel is connected with the valve element and used for driving the valve element to act so that the valve element can seal or open the channel. The section of each sealing face, making contact with the valve element, of the channel is in a circular arc shape, powder can be prevented from being accumulated, the valve element and the valve seat are in linear sealing when the valve is closed, the sealing effect is better, and the problem that in the prior art, after a conventional vacuum stop valve is opened for a period of time under the working condition of powder media, powder cannot be accumulated is solved. And the vacuum sealing performance is obviously reduced.

Description

Technical Field

[0001] The present application belongs to the field of vacuum pipeline technology, and specifically relates to a vacuum stop valve suitable for powder medium working conditions. Background Art

[0002] The vacuum stop valve is a kind of mechanism that acts as a cut-off seal in the vacuum pipeline and is an important component of the vacuum pipeline system. The vacuum stop valves currently on the market are generally used in liquid or gas environments. The vacuum sealing performance of conventional vacuum stop valves will be significantly reduced after opening and closing for a period of time in the presence of powder media. Summary of the invention

[0003] The purpose of the present application is to provide a vacuum stop valve suitable for powder medium working conditions, so as to solve the problem that the vacuum sealing performance of conventional vacuum stop valves in the prior art will be significantly reduced after opening and closing for a period of time under conditions with powder medium.

[0004] Technical solution to achieve the purpose of this application:

[0005] The embodiment of the present application provides a vacuum stop valve suitable for powder medium working conditions, the vacuum stop valve comprising: a valve seat, a valve core and a hand wheel;

[0006] A channel for connecting a pipeline is provided in the valve seat; the valve core is arranged inside the channel to seal the channel;

[0007] The hand wheel is connected to the valve core and is used to drive the valve core to move so that the valve core seals or opens the channel;

[0008] Wherein, the cross section of each sealing surface where the channel contacts the valve core is arc-shaped.

[0009] Optionally, the valve core comprises: a lower valve core and an upper valve core;

[0010] The upper valve core is sleeved on the outer side of the lower valve core; the upper valve core and the lower valve core seal the channel from upper and lower ends respectively;

[0011] The hand wheel and the lower valve core are driven by positive threads, and the hand wheel and the upper valve core are driven by negative threads.

[0012] Optionally, the channel is divided into three parts: a first branch, a second branch and a sealing area;

[0013] The sealing area is a vertical channel, and the upper valve core and the lower valve core seal the sealing area from upper and lower ends respectively;

[0014] The first branch and the second branch are respectively communicated with the upper end and the lower end of the sealing area.

[0015] Optionally, the outlet of the first branch is inclined upward, and an opening is provided at the connection between the first branch and the sealing area, which is sealed by a lower end cover;

[0016] The outlet of the second branch is inclined downward and is on the same horizontal line as the outlet of the first branch.

[0017] Optionally, the valve core further includes: a lower sealing gasket and an upper sealing gasket;

[0018] The outer surfaces of the lower sealing gasket and the upper sealing gasket are both arc-shaped, and are respectively arranged at the sealing surfaces where the lower valve core and the upper valve core meet the channel;

[0019] The lower gasket and the upper gasket are made of elastic material.

[0020] Optionally, the upper sealing gasket is fixed to the upper sealing gasket fixing seat at the lower end of the upper valve core by an upper sealing gasket fixing nut;

[0021] The lower sealing gasket is fixed to the lower sealing gasket positioning gasket at the lower end of the lower valve core through a lower sealing gasket fixing gasket and a lower sealing gasket fixing nut.

[0022] Optionally, the vacuum cut-off valve further comprises: a housing and a valve stem;

[0023] The outer shell is sleeved on the outer side of the valve core, a flange is provided at the lower end, and the outer shell is connected to the upper end of the valve seat through a convex flange;

[0024] The lower end of the valve stem is connected to the valve core, and the upper end passes through the shell and is connected to the handle.

[0025] Optionally, the vacuum stop valve further includes: a lower valve core bellows and an upper valve core bellows;

[0026] The upper valve core bellows sleeve is arranged on the outer side of the upper valve core, and the upper and lower ends are respectively sealed and connected with the upper valve core and the convex flange;

[0027] The bellows sleeve of the lower valve core is arranged on the outer side of the lower valve core, and the upper and lower ends are respectively sealed and connected with the inner sides of the lower valve core and the upper valve core.

[0028] Optionally, the vacuum stop valve further includes: a bearing and a gland;

[0029] The bearing is fixed to the bearing seat on the housing and connected to the valve stem through a bearing retaining ring;

[0030] The gland is sealingly connected to the upper end of the housing, and the upper end of the valve stem passes through the gland.

[0031] Optionally, sealing gaskets are provided at the connections of various components of the vacuum cut-off valve.

[0032] The beneficial technical effects of this application are:

[0033] The embodiment of the present application provides a vacuum stop valve suitable for powder medium working conditions, comprising: a valve seat, a valve core and a handwheel; a channel for connecting a pipeline is opened in the valve seat; the valve core is arranged inside the channel to seal the channel; the handwheel is connected to the valve core, and is used to drive the valve core to move so that the valve core seals or opens the channel; wherein the cross-section of each sealing surface where the channel contacts the valve core is arc-shaped, which can prevent the accumulation of powder, and when the valve is closed, the valve core and the valve seat are linearly sealed, with better sealing effect, which solves the problem in the prior art that the vacuum sealing performance of conventional vacuum stop valves in the presence of powder medium will be significantly reduced after opening and closing for a period of time. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic structural diagram of a vacuum stop valve suitable for powder medium working conditions provided in an embodiment of the present application.

[0035] In the figure:

[0036] 1-handwheel; 2-pressure cover; 3-bearing retaining ring; 4-bearing; 5-valve stem; 6-lower valve core; 7-upper valve core bellows; 8-housing; 9-upper valve core; 10-lower valve core bellows; 11-bearing seat; 12-flange; 13-convex flange; 14-convex flange gasket; 15-pipe flange gasket; 16-valve seat; 17-lower end cover gasket; 18-lower end cover; 19-lower gasket fixing nut; 20-lower gasket fixing washer; 21-lower gasket; 22-lower gasket positioning gasket; 23-upper gasket fixing nut; 24-upper gasket; 25-upper gasket fixing seat; 26-channel. DETAILED DESCRIPTION

[0037] In order to make those skilled in the art better understand the present application, the technical scheme 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. Obviously, the embodiments described below are only a part of the embodiments of the present application, not all. Based on the embodiments recorded in the present application, all other embodiments obtained by those skilled in the art without paying creative work are within the scope of protection of the present application.

[0038] See also Figure 1 , which is a schematic diagram of the structure of a vacuum stop valve suitable for powder medium working conditions provided in an embodiment of the present application.

[0039] The embodiment of the present application provides a vacuum stop valve suitable for powder medium working conditions, comprising: a valve seat 16, a valve core and a hand wheel 1;

[0040] A passage 26 for connecting a pipeline is provided in the valve seat 16; the valve core is arranged inside the passage 26 to seal the passage 26;

[0041] The hand wheel 1 is connected to the valve core and is used to drive the valve core to move so that the valve core seals or opens the channel 26;

[0042] The cross-section of each sealing surface where the channel 26 contacts the valve core is in the shape of an arc.

[0043] It should be noted that in the embodiment of the present application, the cross-section of each sealing surface where the channel 26 contacts the valve core is arc-shaped. On the one hand, it can prevent the accumulation of powder on the sealing surface and avoid the influence of powder on the sealing performance; on the other hand, since the contact area between the arc-shaped sealing surfaces is smaller than the original plane, the influence of powder on the sealing performance is smaller, and when the same force is applied, the pressure is greater and the sealing performance is stronger.

[0044] In some possible implementations of the present application, in order to improve the vacuum tightness of the vacuum cut-off valve, a double valve core two-layer sealing structure may be adopted. Figure 1 As shown, the valve core comprises: a lower valve core 6 and an upper valve core 9;

[0045] The upper valve core 9 is sleeved on the outer side of the lower valve core 6; the upper valve core 9 and the lower valve core 6 seal the channel 26 from the upper and lower ends respectively;

[0046] The hand wheel 1 and the lower valve core 6 are driven by positive threads, and the hand wheel 1 and the upper valve core 9 are driven by negative threads.

[0047] It is understandable that when the hand wheel 1 rotates, the upper valve core 9 and the lower valve core 6 are driven to move in opposite directions, so that the channel 26 can be sealed from both ends at the same time, and the upper and lower sealing surfaces can be opened and closed synchronously.

[0048] In one example, the channel 26 can be divided into three parts: a first branch, a second branch, and a sealing area;

[0049] The sealing area is a vertical channel, and the upper valve core 9 and the lower valve core 6 seal the sealing area from the upper and lower ends respectively;

[0050] The first branch and the second branch are connected to the upper end and the lower end of the sealing area respectively. In another example, the outlet of the first branch can be inclined upward, and the connection between the first branch and the sealing area is provided with an opening, which is sealed by the lower end cover 18;

[0051] The outlet of the second branch may be inclined downward and be on the same horizontal line as the outlet of the first branch.

[0052] It is understandable that an opening is provided at the connection between the first branch and the sealing area, and in practical applications, the valve core can be assembled, replaced, repaired and cleaned by using the opening. The inclined arrangement of the first branch and the second branch can not only ensure that the two outlets are on the same horizontal plane, which can be adapted to installation management, but also prevent the accumulation of dust.

[0053] In some possible implementations of the embodiments of the present application, the valve core may further include: a lower sealing gasket 21 and an upper sealing gasket 24;

[0054] The outer surfaces of the lower sealing gasket 21 and the upper sealing gasket 24 are both arc-shaped, and are respectively arranged at the sealing surfaces where the lower valve core 6 and the upper valve core 9 meet the channel 26;

[0055] The lower sealing gasket 21 and the upper sealing gasket 24 are made of elastic materials to ensure sealing performance.

[0056] In one example, the upper sealing gasket 24 can be fixed to the upper sealing gasket fixing seat 25 at the lower end of the upper valve core 9 by the upper sealing gasket fixing nut 23;

[0057] The lower sealing gasket 21 can be fixed to the lower sealing gasket positioning gasket 22 at the lower end of the lower valve core 6 through the lower sealing gasket fixing gasket 20 and the lower sealing gasket fixing nut 19.

[0058] In some possible implementations of the embodiments of the present application, the vacuum stop valve may further include: a housing 8 and a valve stem 5;

[0059] The housing 8 is sleeved on the outside of the valve core, and a flange 12 is provided at the lower end thereof, and is connected to the upper end of the valve seat 16 through a convex flange 13;

[0060] The lower end of the valve stem 5 is connected to the valve core, and the upper end passes through the housing 8 and is connected to the handle 1 .

[0061] In one example, the vacuum stop valve may further include: a lower valve core bellows 10 and an upper valve core bellows 7;

[0062] The upper valve core bellows 7 is sleeved on the outer side of the upper valve core 9, and the upper and lower ends are respectively sealed and connected to the upper valve core 9 and the convex flange 13;

[0063] The lower valve core bellows 10 is sleeved on the outer side of the lower valve core 6 , and the upper and lower ends are sealedly connected to the inner sides of the lower valve core 6 and the upper valve core 9 respectively.

[0064] It can be understood that the lower valve core bellows 10 and the upper valve core bellows 7 can not only ensure the sealing performance, but also play a supporting role.

[0065] In another example, the vacuum cut-off valve may further include: a bearing 4 and a gland 2;

[0066] The bearing 4 is fixed to the bearing seat 11 on the housing 8 and connected to the valve stem 5 through the bearing retaining ring 3;

[0067] The gland 2 is sealingly connected to the upper end of the housing 8 , and the upper end of the valve stem 5 passes through the gland 2 .

[0068] In some possible implementations of the embodiments of the present application, sealing gaskets are provided at the joints of the various components of the vacuum cut-off valve to ensure sealing performance. Figure 1 As shown in the figure, a lower end cover sealing gasket 17 is arranged at the connection between the lower end cover 18 and the valve seat 16, a pipeline flange sealing gasket 15 is arranged at the connection between the valve seat 16 and the pipeline, and a convex flange sealing gasket 14 is arranged at the connection between the convex flange 13 and the valve seat 16.

[0069] The specific method of using a vacuum stop valve suitable for powder medium working conditions provided in an embodiment of the present application is described in detail below with reference to a specific example.

[0070] In a vacuum stop valve suitable for powder medium working conditions provided in an embodiment of the present application, a valve stem 5 is connected to a housing 8 through a bearing 4, a bearing retaining ring 3 is provided on the valve stem 5 to contact the bearing 4, and a bearing seat 11 is provided on the housing 8 to install the bearing 4. The valve stem 5 is positioned using the housing 8 through the above structure.

[0071] When the hand wheel 1 rotates counterclockwise, the valve stem 5 rotates counterclockwise, the upper valve core 9 is connected to the valve stem 5 through a reverse thread, and the lower valve core 6 is connected to the valve stem 5 through a positive thread. At this time, the upper valve core 9 moves upward, the lower valve core 6 moves downward, and the vacuum stop valve is in an open state.

[0072] When the hand wheel 1 rotates clockwise, the valve stem 5 rotates clockwise, the upper valve core 9 is connected to the valve stem 5 through a reverse thread, and the lower valve core 6 is connected to the valve stem 5 through a positive thread. At this time, the upper valve core 9 moves downward, and the lower valve core 6 moves upward, and the vacuum stop valve is in a closed state.

[0073] The embodiment of the present application provides a vacuum stop valve suitable for powder medium working conditions, comprising: a valve seat, a valve core and a handwheel; a channel for connecting a pipeline is opened in the valve seat; the valve core is arranged inside the channel to seal the channel; the handwheel is connected to the valve core, and is used to drive the valve core to move so that the valve core seals or opens the channel; wherein the cross-section of each sealing surface where the channel contacts the valve core is arc-shaped, which can prevent the accumulation of powder, and when the valve is closed, the valve core and the valve seat are linearly sealed, with better sealing effect, which solves the problem in the prior art that the vacuum sealing performance of conventional vacuum stop valves in the presence of powder medium will be significantly reduced after opening and closing for a period of time.

[0074] The present application is described in detail above in conjunction with the accompanying drawings and embodiments, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present application. Any content not described in detail in the present application can adopt the existing technology.

Claims

1. A vacuum stop valve suitable for powder medium working conditions, characterized in that: The vacuum stop valve comprises: a valve seat (16), a valve core and a hand wheel (1); A channel (26) for connecting a pipeline is provided in the valve seat (16); the valve core is arranged inside the channel (26) and is used to seal the channel (26); A hand wheel (1) is connected to the valve core and is used to drive the valve core to move so that the valve core seals or opens a channel (26); Wherein, the cross section of each sealing surface where the channel (26) contacts the valve core is in the shape of an arc.

2. The vacuum stop valve suitable for powder medium working conditions according to claim 1 is characterized in that: The valve core comprises: a lower valve core (6) and an upper valve core (9); The upper valve core (9) is sleeved on the outer side of the lower valve core (6); the upper valve core (9) and the lower valve core (6) seal the channel (26) from the upper and lower ends respectively; The hand wheel (1) and the lower valve core (6) are driven by positive threads, and the hand wheel (1) and the upper valve core (9) are driven by negative threads.

3. The vacuum stop valve suitable for powder medium working conditions according to claim 2 is characterized in that: The channel (26) is divided into three parts: a first branch, a second branch and a sealing area; The sealing area is a vertical channel, and the upper valve core (9) and the lower valve core (6) seal the sealing area from upper and lower ends respectively; The first branch and the second branch are respectively communicated with the upper end and the lower end of the sealing area.

4. The vacuum stop valve suitable for powder medium working conditions according to claim 3 is characterized in that: The outlet of the first branch is inclined upward, and an opening is provided at the connection between the first branch and the sealing area, which is sealed by a lower end cover (18); The outlet of the second branch is inclined downward and is on the same horizontal line as the outlet of the first branch.

5. The vacuum stop valve suitable for powder medium working conditions according to claim 2, characterized in that: The valve core also includes: a lower sealing gasket (21) and an upper sealing gasket (24); The outer surfaces of the lower sealing gasket (21) and the upper sealing gasket (24) are both arc-shaped and are respectively arranged at the sealing surfaces where the lower valve core (6) and the upper valve core (9) meet the channel (26); The lower sealing pad (21) and the upper sealing pad (24) are made of elastic material.

6. The vacuum stop valve suitable for powder medium working conditions according to claim 5, characterized in that: The upper sealing gasket (24) is fixed to the upper sealing gasket fixing seat (25) at the lower end of the upper valve core (9) through the upper sealing gasket fixing nut (23); The lower sealing gasket (21) is fixed to the lower sealing gasket positioning gasket (22) at the lower end of the lower valve core (6) through a lower sealing gasket fixing gasket (20) and a lower sealing gasket fixing nut (19).

7. The vacuum stop valve suitable for powder medium working conditions according to any one of claims 2 to 6, characterized in that: The vacuum stop valve further comprises: a housing (8) and a valve stem (5); The housing (8) is sleeved on the outer side of the valve core, a flange (12) is provided at the lower end, and the housing (8) is connected to the upper end of the valve seat (16) via a convex flange (13); The lower end of the valve stem (5) is connected to the valve core, and the upper end passes through the housing (8) and is connected to the handle (1).

8. The vacuum stop valve suitable for powder medium working conditions according to claim 7, characterized in that: The vacuum stop valve further comprises: a lower valve core bellows (10) and an upper valve core bellows (7); The upper valve core bellows (7) is sleeved on the outer side of the upper valve core (9), and the upper and lower ends are respectively sealed and connected to the upper valve core (9) and the convex flange (13); The lower valve core bellows (10) is sleeved on the outer side of the lower valve core (6), and the upper and lower ends are respectively sealed and connected to the inner sides of the lower valve core (6) and the upper valve core (9).

9. The vacuum stop valve suitable for powder medium working conditions according to claim 7, characterized in that: The vacuum stop valve further comprises: a bearing (4) and a gland (2); The bearing (4) is fixed to the bearing seat (11) on the housing (8) and is connected to the valve stem (5) via a bearing retaining ring (3); The gland (2) is sealingly connected to the upper end of the housing (8), and the upper end of the valve stem (5) passes through the gland (2).

10. The vacuum stop valve suitable for powder medium working conditions according to claim 7, characterized in that: Sealing pads are provided at the connections of the various components of the vacuum cut-off valve.

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