CN211715790U - Backflow-preventing stop valve - Google Patents

Abstract

The utility model provides a prevent stop valve that flows backwards belongs to the valve field, which comprises a valve body, first disk seat, the valve shaft, first floater and valve gap, the valve gap sets firmly in the upper end of valve body and the sealed setting of the two, first disk seat and 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 spacing net, the inside that the valve body is close to the medium exit end is equipped with the second disk seat, the second floater is established between spacing net and second valve seat, the sealed setting in second floater and second valve seat cooperation back. The utility model discloses when the medium refluence, thereby the second floater floats to the inner wall in close contact with of valve body reaches the sealed effect that cuts off the medium flow, thereby utilizes water pressure to reach sealed effect with first floater jack-up and first disk seat in close contact with, and pressure is big more, and first floater is inseparabler with first disk seat contact, and sealing performance is better.

Description

Backflow-preventing stop valve

Technical Field

The utility model belongs to the valve field relates to prevent backflow stop valve.

Background

The stop valve is also called stop valve, belonging to forced sealing type valve, so when the valve is closed, it must apply pressure to valve clack to force sealing surface not to leak, when the medium is fed into the valve from below the valve clack, the resistance force which must be overcome by operation force is the friction force of valve stem and packing material and the thrust force produced by pressure of medium, the force for closing the valve is greater than the force for opening the valve, so the diameter of valve stem is greater, otherwise the failure of stem top bending can occur.

The closed principle of traditional stop valve is, rely on valve thick stick pressure, make the sealed face of valve clack and the sealed face of first disk seat closely laminate, prevent the medium circulation, this just leads to the sealed face of valve clack and the sealed face laminating untight problem of first disk seat under the big circumstances of pressure, current stop valve is the hand wheel formula drive mostly, the hand wheel exposes and causes artificial rotation easily, or dismantles, influence the performance of valve, present stop valve does not have the non return function moreover, can produce certain water hammer problem, there is certain influence to the valve life-span.

SUMMERY OF THE UTILITY MODEL

The to-be-solved problem of the utility model is to provide a prevent backflow stop valve, when the medium refluence, because medium buoyancy acts on the second floater, thereby the second floater floats to the inner wall in close contact with of valve body and reaches the sealed effect that cuts off the medium flow, thereby utilizes water pressure to reach sealed effect with first floater jack-up and first disk seat in close contact with, and pressure is big more, and first floater is inseparable more with first disk seat contact, and sealing performance is better.

In order to solve the technical problem, the utility model discloses a technical scheme is: prevent stop valve that flows backwards, 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.

Furthermore, the limiting net is of a cross-shaped welding rod structure and is fixedly connected with the valve body.

Furthermore, the outlet end of the valve body is detachably connected with a water outlet valve body, the inner diameters of the inlet and the outlet of the water outlet valve body are the same as the inner diameter 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.

Further, 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 matched to set up has the actuating lever.

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

The valve shaft penetrates through the valve cover downwards and is arranged above the first floating ball, and the first floating ball and the second floating ball are the same in structure.

Furthermore, 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.

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

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

Furthermore, the position where the first valve seat is matched with the first floating ball is a round angle, and the roughness of the round angle is 0.8.

Compared with the prior art, the utility model has the advantages and positive effect as follows.

1. The utility model is provided with the second floating ball, when the medium flows backwards, because the medium buoyancy acts on the second floating ball, the second floating ball floats to the inner wall of the valve body to be in close contact with the inner wall of the valve body, thereby achieving the effect of sealing and cutting off the medium flow and effectively preventing the water hammer; meanwhile, the valve rod is provided with the driving groove and the matched driving rod, so that the safety is higher because no hand wheel is arranged;

2. the utility model realizes sealing by the cooperation of the first floating ball and the first valve seat, has simple structure, only needs to replace the first floating ball for maintenance, saves cost, realizes self sealing by the pressure of a medium, has good sealing performance, has higher pressure, and has more close contact between the first floating ball and the first valve seat, and better sealing performance;

3. a rubber pad is arranged between the lower end of the valve shaft and the first floating ball, so that when the valve rod applies pressure to the first floating ball, the first floating ball is uniformly stressed, the first floating ball is effectively protected from being deformed easily, and the stability of the structure is improved;

4. be equipped with the copper sheathing between guide post and the locating rack, can promote the wearability between guide post and the locating rack, prolong the life of guide post.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

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

FIG. 2 is a view of the present invention from the direction A of FIG. 1;

FIG. 3 is a view of the present invention from the direction B of FIG. 1;

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

FIG. 5 is a cross-sectional view of the backflow prevention stop valve of the present invention after being fitted with the outlet valve body;

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

Reference numerals:

1. a valve body; 11. a limiting net; 12. a second valve seat; 2. a positioning frame; 21. a copper sleeve; 3. a first floating ball; 31. a deformation layer; 32. a guide post; 4. a first valve seat; 41. round corners; 5. a valve shaft; 51. a rubber pad; 52. a limiting bulge; 53. a driving groove; 6. a valve cover; 7. a seal ring; 8. a drive rod; 10. a second floating ball; 20. a water outlet valve body.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.

As shown in fig. 1-6, the utility model discloses a prevent stop valve that flows backwards, including valve body 1, first disk seat 4, the valve shaft 5, first floater 3 and valve gap 6, valve gap 6 sets firmly the sealed setting in upper end and the two of valve body 1, first disk seat 4 and 1 integrated into one piece of valve body, the inside of the exit end of valve body 1 is equipped with second floater 10, the surface cladding of second floater 10 has deformation layer 31, the exit end of valve body 1 is equipped with spacing net 11, the diameter of second floater 10 is greater than the aperture setting on spacing net 11, the inside that valve body 1 is close to the medium exit end is equipped with second valve seat 12, second floater 10 is established between spacing net 11 and second valve seat 12, sealed the setting after second floater 10 and the cooperation of second valve seat 12.

Preferably, the limiting net 11 is a cross-shaped welding rod structure, the limiting net 11 is fixedly connected with the valve body 1, the structure is simple, the strength is high, the stability is good, and the floating ball is prevented from rolling out of the flow channel; more preferably, the outlet end of the valve body 1 is detachably connected with a water outlet valve body 20, the inner diameter of the inlet and the outlet of the water outlet valve body 20 is the same as that of the outlet end of the valve body 1, the inner cavity of the water outlet valve body 20 is of an arc structure protruding outwards, the water outlet valve is suitable for large caliber and has a certain buffering effect and good stability, and when the water outlet valve body 20 is arranged, the limiting net 11 is arranged at one end, far away from the valve body 1, of the water outlet valve body 20.

Preferably, the upper end of the valve rod is in threaded connection with the valve body 1, a sealing ring 7 is arranged between the outer ring of the valve rod and the valve body 1, the upper end of the valve rod is lower than the valve cover 6, an inwards concave driving groove 53 is formed in the upper end face of the valve rod, and a driving rod 8 is arranged in a manner of being matched with the driving groove 53; preferably, the section of the driving groove 53 is of a hexagonal structure, the driving rod 8 is of a T shape, the valve cover 6 is provided with an internal thread, the upper end of the valve shaft 5 is provided with an external thread, the valve rod is moved up and down by utilizing the close contact degree between the valve cover 6 and the valve shaft 5, when the valve is opened, the bottom end of the driving rod 8 is inserted into the driving groove at the top end of the valve rod, the driving rod 8 is rotated clockwise, so that the valve shaft 5 is tightly connected with the valve cover 6, and the structure is free of a hand wheel and is provided with the driving rod.

Preferably, still include first floater 3, first floater 3 sets up the entrance point at valve body 1 and establishes the lower extreme at first disk seat 4, valve body 1 has set firmly locating rack 2 on being close to the inner wall of entrance point, the lower extreme of first floater 3 is equipped with guide post 32, guide post 32 perpendicular to locating rack 2 sets up and relative locating rack 2 upper and lower sliding connection, in the last extreme position of first floater 3, guide post 32 is located locating rack 2, valve shaft 5 passes setting in first floater 3 top behind valve gap 6 downwards, the surface cladding of first floater 3 has deformation layer 31, with locating rack 2 and the fixed first floater 3 movement track of guide post 32, first floater 3 only can reciprocate along locating rack 2 holes, promote the precision of first floater 3 up-and-down motion.

Preferably, the lower extreme of valve shaft 5 is the arc and the radian is the same with the diameter of first floater 3, is equipped with rubber pad 51 between the lower extreme of valve shaft 5 and the first floater 3 for when the valve rod applys pressure to first floater 3, first floater 3 atress is even, effectively protects first floater 3 non-deformable, promotes the stability of structure.

Preferably, be equipped with copper sheathing 21 between guide post 32 and the locating rack 2, copper sheathing 21 inlays to be established in locating rack 2, sets up copper sheathing 21 thick, can promote the wearability between guide post 32 and the locating rack 2, prolongs guide post 32's life.

Preferably, the deformation layer 31 is rubber, polytetrafluoroethylene or silica gel material, and the thickness that the deformation layer 31 is 1.5 ~ 5mm, and preferably rubber material, thickness are 2mm, and thickness is too little, and the deflection is not thick, influences sealing performance, if thickness is too big, and the preparation is inconvenient, and floating performance reduces moreover, and specific thickness can carry out appropriate adjustment according to the size of specification and medium flow, guarantees certain pre-compaction deformation, and it can to guarantee the leakproofness.

Preferably, first valve seat 4 is fillet 41 and roughness is 0.8 with first floater 3 complex position, and the machining precision is higher, and contact sealing performance is higher, and sealed effect is higher, sets up fillet 41 back, is difficult to cause the damage to first floater 3, is favorable to promoting first floater 3's life.

In the actual working process, the first valve seat 4 and the valve body 1 are made of the same material, the first valve seat 4 and the valve body 1 are integrally cast, the process is simple, the cost is low, the first valve seat 4 is finely processed in the later period, the round angle 41 is guaranteed to reach the roughness of more than 0.8 after being ground, the first floating ball 3 is integrally encapsulated with rubber, the deformation layer 31 is externally coated, the deformation layer 31 is preferably made of rubber, and the first floating ball 3 is integrally encapsulated by using the rubber to realize sealing;

when the valve is opened, the valve rod is utilized to apply pressure to the first floating ball 3, so that the first floating ball 3 is separated from the sealing surface of the first valve seat 4, and the medium in the pipeline flows; when the valve is closed, the driving rod is inserted into the driving groove to drive the valve rod, so that the valve rod is lifted to a certain height, the valve can realize self sealing by depending on the pressure of a medium, namely, the first floating ball 3 floats upwards to be in close contact with the sealing surface of the first valve seat 4 under the action of the pressure of the medium so as to achieve sealing and prevent the medium from flowing, the structure realizes sealing by matching the first floating ball 3 and the first valve seat 4 in front of the two parts, the structure is simple, only the first floating ball 3 needs to be replaced for maintenance, the cost is saved, the self sealing is realized by depending on the pressure of the medium, the sealing performance is good, the larger the pressure is, the closer the first floating ball 3 is in contact with; when the medium flows backwards, the medium buoyancy acts on the second floating ball, the second floating ball floats to the sealing surface of the second valve seat, the second floating ball and the second floating ball are in close contact, the medium flowing is cut off in a sealing mode, the stop valve with the return stopping function can effectively block the medium from flowing backwards, water hammer is prevented, and the service life of the structure is prolonged.

While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention, and should not be considered as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.

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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