CN211715790U - Anti-backflow globe valve - Google Patents

Abstract

The utility model provides an anti-backflow stop valve, belonging to the field of valves, comprising a valve body, a first valve seat, a valve shaft, a first floating ball and a valve cover. The valve cover is fixed on the upper end of the valve body and the two are sealed. A valve seat is integrally formed with the valve body, the inside of the outlet end of the valve body is provided with a second floating ball, the outer surface of the second floating ball is covered with a deformation layer, the outlet end of the valve body is provided with a limiting net, and the second floating ball is The diameter is larger than the aperture setting on the limit net, the valve body is provided with a second valve seat inside the outlet end of the medium, the second float ball is arranged between the limit net and the second valve seat, and the second float ball cooperates with the second valve seat Back seal setting. In the utility model, when the medium flows backwards, the second floating ball floats to the inner wall of the valve body and is in close contact with the inner wall of the valve body to achieve the effect of sealing and cutting off the flow of the medium. The higher the pressure, the tighter the contact between the first float ball and the first valve seat, and the better the sealing performance.

Description

Anti-backflow globe valve

technical field

The utility model belongs to the field of valves, and relates to an anti-backflow stop valve.

Background technique

The globe valve, also known as the gate valve, is a forced-sealing valve. Therefore, when the valve is closed, pressure must be applied to the valve disc to force the sealing surface to not leak. When the medium enters the valve from below the valve disc, the operating force needs to overcome the resistance. , is the friction force between the valve stem and the packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve, so the diameter of the valve stem should be larger, otherwise the valve stem top bending failure will occur.

The closing principle of the traditional globe valve is to rely on the pressure of the valve stem to make the sealing surface of the disc and the sealing surface of the first valve seat closely fit to prevent the flow of the medium, which leads to the sealing surface of the disc and the first valve under high pressure. The problem that the sealing surface of the seat is not tightly fitted. Most of the existing globe valves are driven by handwheels, and the exposed handwheel is easy to cause artificial rotation or disassembly, which affects the performance of the valve, and the current globe valves have no check function, which will cause Certain water hammer problems have a certain impact on the life of the valve.

Utility model content

The problem to be solved by the present utility model is to provide an anti-backflow stop valve. When the medium flows back, due to the buoyancy of the medium acting on the second floating ball, the second floating ball floats to the inner wall of the valve body in close contact, so as to seal and cut off the flow of the medium. The water pressure is used to push the first floating ball into close contact with the first valve seat to achieve sealing. The higher the pressure, the tighter the first floating ball is in contact with the first valve seat and the better the sealing performance.

In order to solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: an anti-backflow stop valve includes a valve body, a first valve seat, a valve shaft, a first floating ball and a valve cover, and the valve cover is fixed on the valve The first valve seat and the valve body are integrally formed, the inside of the outlet end of the valve body is provided with a second floating ball, and the outer surface of the second floating ball is covered with Deformation layer, the outlet end of the valve body is provided with a limiting net, the diameter of the second floating ball is set larger than the aperture on the limiting net, the valve body is provided with a second valve seat inside the outlet end of the medium, the Two floating balls are arranged between the limiting net and the second valve seat, and the second floating balls are fitted with the second valve seat and are sealed.

Further, the limiting net is a cross-shaped electrode structure, and the limiting net is fixedly connected with the valve body.

Further, the outlet end of the valve body is detachably connected with a water outlet valve body, the inlet and outlet of the water outlet valve body have the same inner diameter as the outlet end of the valve body, and the inner cavity of the water outlet valve body is outwardly convex. arc structure.

Further, the upper end of the valve stem is threadedly connected with the valve body, a sealing ring is arranged between the outer ring of the valve stem and the valve body, and the upper end of the valve stem is set lower than the valve cover, The upper end surface of the valve rod is provided with a concave driving groove, and a driving rod is matched with the driving groove.

Further, the cross section of the driving groove is a hexagonal structure, and the driving rod is T-shaped.

Further, it also includes a first floating ball, the first floating ball is arranged at the inlet end of the valve body and at the lower end of the first valve seat, and a spacer is fixed on the inner wall of the valve body near the inlet end, The lower end of the first floating ball is provided with a guide column, the guide column is arranged perpendicular to the positioning frame and is slidably connected up and down relative to the positioning frame. At the upper limit position of the first floating ball, the guide column is located at the In the positioning frame, the valve shaft passes downward through the valve cover and is disposed above the first floating ball, and the first floating ball and the second floating ball have the same structure.

Further, the lower end of the valve shaft is arc-shaped and the arc is the same as the diameter of the first floating ball, and a rubber pad is provided between the lower end of the valve shaft and the first floating ball.

Further, a copper sleeve is arranged between the guide column and the positioning frame, and the copper sleeve is embedded in the positioning frame.

Further, the deformation layer is made of rubber, polytetrafluoroethylene or silica gel, and the thickness of the deformation layer is 1.5-5 mm.

Further, the position where the first valve seat is matched with the first floating ball is rounded and the roughness is 0.8.

Compared with the prior art, the advantages and positive effects of the present invention are as follows.

1. The utility model is provided with a second floating ball. When the medium flows backwards, due to the buoyancy of the medium acting on the second floating ball, the second floating ball floats to the inner wall of the valve body and is in close contact with the inner wall of the valve body to achieve the effect of sealing and cutting off the flow of the medium, effectively preventing Water hammer; at the same time, a driving groove and a matching driving rod are set on the valve stem, no handwheel, and the safety is higher;

2. The utility model realizes sealing through the cooperation between the first floating ball and the first valve seat, the structure is simple, and the maintenance only needs to replace the first floating ball, which saves costs, and realizes self-sealing by the pressure of the medium. Well, the higher the pressure, the tighter the contact between the first float ball and the first valve seat, and the better the sealing performance;

3. There is a rubber pad between the lower end of the valve shaft and the first floating ball, so that when the valve stem applies pressure to the first floating ball, the first floating ball is evenly stressed, which effectively protects the first floating ball from being deformed and improves the structure of the lifting structure. stability;

4. There is a copper sleeve between the guide column and the positioning frame, which can improve the wear resistance between the guide column and the positioning frame and prolong the service life of the guide column.

Description of drawings

The accompanying drawings that constitute a part of the present invention are used to provide further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

1 is a cross-sectional view of the anti-backflow stop valve of the present invention in a fully closed state;

Fig. 2 is the A-direction view of Fig. 1 of the present utility model;

Fig. 3 is the B-direction view of Fig. 1 of the present utility model;

4 is a cross-sectional view of the anti-backflow stop valve of the present invention in a fully open state;

Fig. 5 is the sectional view of the utility model after the anti-backflow stop valve is matched with the outlet valve body;

FIG. 6 is a schematic structural diagram of the first floating ball and the valve seat of the present invention.

Reference number:

1. Valve body; 11. Limiting net; 12. Second valve seat; 2. Positioning frame; 21. Copper sleeve; 3. First floating ball; 31. Deformation layer; 32. Guide column; 4. First valve Seat; 41, fillet; 5, valve shaft; 51, rubber gasket; 52, limit protrusion; 53, drive groove; 6, valve cover; 7, sealing ring; 8, drive rod; 10, second float Ball; 20. The body of the outlet valve.

Detailed ways

It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "horizontal", "upper", "lower", "front", "rear", "left", "right", The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility. The novel and simplified description does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first", "second", etc., may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection. Detachable connection, or integral connection; may be mechanical connection or electrical connection; may be direct connection, or indirect connection through an intermediate medium, or internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

The specific embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

As shown in Figures 1 to 6, the present utility model is an anti-backflow stop valve, comprising a valve body 1, a first valve seat 4, a valve shaft 5, a first floating ball 3 and a valve cover 6, and the valve cover 6 is fixed on the valve The upper end of the valve body 1 and the two are sealed, the first valve seat 4 and the valve body 1 are integrally formed, the inside of the outlet end of the valve body 1 is provided with a second floating ball 10, and the outer surface of the second floating ball 10 is covered with a deformation layer 31. The outlet end of the valve body 1 is provided with a limiting net 11. The diameter of the second float ball 10 is set larger than the aperture on the limiting net 11. The valve body 1 is provided with a second valve seat 12 in the interior of the valve body 1 near the outlet end of the medium. The ball 10 is arranged between the limiting net 11 and the second valve seat 12 , and the second floating ball 10 is sealed with the second valve seat 12 after being matched.

Preferably, the limiting net 11 is a cross-shaped welding rod structure, and the limiting net 11 is fixedly connected to the valve body 1, with a simple structure, high strength, good stability, and prevents the floating ball from rolling out of the flow channel; more preferably, the valve body 1 The outlet end of the outlet valve body 20 is detachably connected with the outlet valve body 20. The inlet and outlet of the outlet valve body 20 have the same inner diameter as the outlet end of the valve body 1. The inner cavity of the outlet valve body 20 is an outwardly convex arc structure, which is suitable for large When the outlet valve body 20 is installed, the limiting net 11 is arranged at the end of the outlet valve body 20 away from the valve body 1 .

Preferably, the upper end of the valve stem is threadedly connected to the valve body 1 , a sealing ring 7 is provided between the outer ring of the valve stem and the valve body 1 , the upper end of the valve stem is set lower than the valve cover 6 , and the upper end surface of the valve stem is provided with an inner The concave driving groove 53 has a driving rod 8 matched with the driving groove 53; preferably, the cross section of the driving groove 53 is a hexagonal structure, the driving rod 8 is T-shaped, the valve cover 6 is provided with internal threads, and the valve shaft 5. The upper end is provided with an external thread, and the up and down movement of the valve stem is realized by the close contact between the valve cover 6 and the valve shaft 5. When the valve is opened, insert the bottom end of the driving rod 8 into the driving groove on the top of the valve stem, clockwise Rotate the driving rod 8 to make the valve shaft 5 and the valve cover 6 tightly connected. This structure has no handwheel and is equipped with the driving rod 8 of the on-off valve, which is safe.

Preferably, it also includes a first float ball 3, the first float ball 3 is arranged at the inlet end of the valve body 1 and at the lower end of the first valve seat 4, and a spacer 2 is fixed on the inner wall of the valve body 1 near the inlet end, The lower end of the first floating ball 3 is provided with a guide post 32 . The guide post 32 is arranged perpendicular to the positioning frame 2 and is slidably connected up and down relative to the positioning frame 2 . At the upper limit position of the first floating ball 3 , the guiding post 32 is located in the positioning frame 2 , the valve shaft 5 passes downward through the valve cover 6 and is arranged above the first floating ball 3 , the outer surface of the first floating ball 3 is covered with a deformation layer 31 , and the first floating ball 3 is fixed by the positioning frame 2 and the guide column 32 According to the movement trajectory, the first floating ball 3 can only move up and down along the hole of the positioning frame 2, which improves the accuracy of the up and down movement of the first floating ball 3.

Preferably, the lower end of the valve shaft 5 is arc-shaped and the curvature is the same as the diameter of the first float ball 3 , and a rubber pad 51 is provided between the lower end of the valve shaft 5 and the first float ball 3 , so that the valve stem is directed toward the first float ball 3 . 3. When pressure is applied, the first floating ball 3 is evenly stressed, which effectively protects the first floating ball 3 from being deformed and improves the stability of the structure.

Preferably, a copper sleeve 21 is provided between the guide post 32 and the positioning frame 2 , the copper sleeve 21 is embedded in the positioning frame 2 , and the thickness of the copper sleeve 21 is set to improve the wear resistance between the guide post 32 and the positioning frame 2 , prolonging the service life of the guide column 32 .

Preferably, the deformation layer 31 is made of rubber, polytetrafluoroethylene or silica gel, and the thickness of the deformation layer 31 is 1.5-5 mm, preferably a rubber material, with a thickness of 2 mm. If the thickness is too large, it is inconvenient to manufacture, and the floating performance is reduced. The specific thickness can be adjusted appropriately according to the specification and the size of the medium flow, so as to ensure a certain pre-compression deformation and ensure the sealing performance.

Preferably, the matching position of the first valve seat 4 and the first float ball 3 is the rounded corner 41 and the roughness is 0.8. The higher the machining accuracy, the higher the contact sealing performance and the higher the sealing effect. It is easy to cause damage to the first floating ball 3 , which is beneficial to improve the service life of the first floating ball 3 .

In the actual working process, the first valve seat 4 and the valve body 1 are made of the same material, and the first valve seat 4 and the valve body 1 are integrally cast with simple process and low cost. The rounded corners 41 have a roughness of more than 0.8 after being ground, and the first float 3 is covered with plastic as a whole, and is covered with a deformation layer 31. The deformation layer 31 is preferably made of rubber, and the first float 3 is entirely covered with rubber. , to achieve sealing;

When the valve is opened, the valve rod is used to apply pressure to the first floating ball 3, so that the first floating ball 3 and the sealing surface of the first valve seat 4 are separated, and the medium in the pipeline flows; when the valve is closed, the driving rod is inserted into the driving concave In the groove, the valve stem is driven to raise the valve stem to a certain height, and the valve can realize self-sealing by the pressure of the medium, that is, the first floating ball 3 floats up under the action of the medium pressure and is in close contact with the sealing surface of the first valve seat 4, thereby To achieve sealing and prevent the medium from circulating, this structure realizes sealing through the cooperation between the first floating ball 3 and the first valve seat 4. The structure is simple, and the maintenance only needs to replace the first floating ball 3, which saves costs and depends on the medium. The pressure realizes self-sealing, and the sealing performance is good. The greater the pressure, the tighter the contact between the first floating ball 3 and the first valve seat 4, and the better the sealing performance; when the medium flows back, due to the buoyancy of the medium acting on the second floating ball, the The second floating ball floats to the sealing surface of the second valve seat, and the two are in close contact to seal and cut off the flow of the medium. The globe valve with the check function can effectively block the backflow of the medium, prevent water hammer, and improve the service life of the structure.

An embodiment of the present invention has been described in detail above, but the content is only a preferred embodiment of the present invention, and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present utility model should still belong to the scope of the patent of the present utility model.

Claims (10)

1. Prevent check valve that flows backwards, its characterized in that: including valve body, first disk seat, valve shaft, first floater and valve gap, the valve gap sets firmly the upper end and the two sealed setting of valve body, first disk seat with valve body integrated into one piece, the inside of the exit end of valve body is equipped with the second floater, the surface cladding of second floater has the deformation layer, the exit end of valve body is equipped with spacing net, the diameter of second floater is greater than the aperture setting on the spacing net, the inside that the valve body is close to the medium exit end is equipped with the second valve seat, the second floater is established spacing net with between the second valve seat, the second floater with sealed setting after the cooperation of second valve seat.

2. The backflow prevention shut-off valve of claim 1, wherein: the limiting net is of a cross-shaped welding rod structure and is fixedly connected with the valve body.

3. The backflow prevention shut-off valve of claim 1, wherein: the outlet end of the valve body is detachably connected with a water outlet valve body, the inner diameter of the inlet and the outlet of the water outlet valve body is the same as that of the outlet end of the valve body, and the inner cavity of the water outlet valve body is of an arc-shaped structure protruding outwards.

4. The backflow prevention shut-off valve of claim 1, wherein: the upper end of valve rod with valve body threaded connection, the outer lane of valve rod with be equipped with the sealing washer between the valve body, the upper end of valve rod is less than the valve gap sets up, the up end of valve rod is equipped with the drive recess of indent, with what the drive recess matches the setting has the actuating lever.

5. The backflow prevention shut-off valve of claim 4, wherein: the section of the driving groove is of a hexagonal structure, and the driving rod is T-shaped.

6. The backflow prevention shut-off valve of claim 1, wherein: the valve shaft is arranged above the first floating ball after passing through the valve cover downwards, and the first floating ball and the second floating ball are identical in structure.

7. The backflow prevention shut-off valve of claim 6, wherein: the lower end of the valve shaft is arc-shaped, the radian of the lower end of the valve shaft is the same as the diameter of the first floating ball, and a rubber pad is arranged between the lower end of the valve shaft and the first floating ball.

8. The backflow prevention shut-off valve of claim 6, wherein: the guide post with be equipped with the copper sheathing between the locating rack, the copper sheathing inlays to be established in the locating rack.

9. The backflow prevention shut-off valve of claim 6, wherein: the deformation layer is made of rubber, polytetrafluoroethylene or silica gel, and the thickness of the deformation layer is 1.5-5 mm.

10. The backflow prevention shut-off valve of claim 6, wherein: the position where the first valve seat is matched with the first floating ball is a round angle, and the roughness of the first valve seat is 0.8.

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