CN210196562U - Micro-resistance slow-closing type check valve - Google Patents

Abstract

The utility model discloses a micro-resistance slow-closing check valve, which belongs to the technical field of check valves and comprises a valve body, wherein a valve clack is arranged at the middle position of the front surface of the valve body, an oil storage cylinder is arranged above the valve body, a piston is arranged inside the oil storage cylinder, a small cylinder is arranged above the oil storage cylinder, a small cylinder piston is arranged inside the small cylinder, the piston is connected with the small cylinder piston, a needle valve is arranged right in front of the outside of the small cylinder, the top end of the small cylinder is connected with a three-way joint, the other two ends of the three-way joint are symmetrically connected with a hard pipe, micro-resistance cylinders are symmetrically arranged on the two sides of the inside of the valve body, the output end of each micro-; the two valve clacks are pushed away stably under the action of medium thrust, when the pressure of an inlet medium is lower than that of an outlet, the medium flows back, the top valve clacks can not be closed completely, about 20% of area is reserved for the medium to pass through, and therefore the effect of eliminating water hammer is achieved.

Description

Micro-resistance slow-closing type check valve

Technical Field

The utility model belongs to the technical field of the check valve, concretely relates to hinders slow-closure check valve a little.

Background

The check valve is a valve whose opening and closing member is a circular valve flap and acts by self weight and medium pressure to block medium backflow, belonging to the automatic valve class, also called check valve, one-way valve, backflow valve or isolating valve, the valve flap motion mode is divided into lift type and swing type, the lift type check valve is similar to the structure of the stop valve, only lacks a valve rod for driving the valve flap, the medium flows in from the inlet end (lower side) and flows out from the outlet end (upper side), when the inlet pressure is greater than the sum of the weight of the valve flap and the flow resistance thereof, the valve is opened, otherwise, the valve is closed when the medium flows backwards, the swing type check valve has a valve flap which is obliquely arranged and can rotate around a shaft, the check valve is commonly used as a bottom valve of a water pumping device, can block the backflow of water, and the stop valve is combined with the stop.

The prior art has the following problems:

1. the existing check valve has the defects of large resistance, poor sealing property when closed, poor energy-saving effect and large volume, and the flow rate is suddenly changed and the pressure intensity is greatly fluctuated due to the reasons of sudden opening or closing of a valve, sudden stop of a water pump, sudden opening and closing of a guide vane and the like in the process of conveying a medium.

SUMMERY OF THE UTILITY MODEL

To solve the problems set forth in the background art described above. The utility model provides a micro-resistance slow-closing check valve, which has the characteristics of eliminating water hammer and water hammer.

In order to achieve the above object, the utility model provides a following technical scheme: the micro-resistance slow-closing check valve comprises a valve body, wherein a valve clack is installed at the middle position of the front surface of the valve body, an oil storage cylinder is installed above the valve body, a piston is arranged inside the oil storage cylinder and penetrates through the oil storage cylinder and extends to the outside of the oil storage cylinder, a small cylinder is arranged above the oil storage cylinder, a small cylinder piston is arranged inside the small cylinder, the top end of the piston penetrates through the small cylinder and extends to the inside of the small cylinder, the piston is connected with the small cylinder piston, a needle valve is installed right in front of the outside of the small cylinder and penetrates through the small cylinder and extends to the inside of the small cylinder, the needle valve is connected with the other end of the small cylinder piston, a three-way joint is connected with the small cylinder, and the other two ends of the three-way joint are symmetrically connected with a hard pipe, the micro-resistance cylinder is symmetrically arranged on two sides of the interior of the valve body, a piston rod is arranged at the output end of the micro-resistance cylinder, the piston rod penetrates through the micro-resistance cylinder and extends to the exterior of the micro-resistance cylinder, and the other end of the hard tube is communicated with the micro-resistance cylinder.

Preferably, a sealing ring and a flat head of a silencer are arranged outside the micro-resistance cylinder, and the sealing ring is an O-shaped sealing ring.

Preferably, the valve clacks are in a semicircular structure, and the number of the valve clacks is two, and the two valve clacks are symmetrically arranged on the valve body.

Preferably, the hard tube with be provided with first clamp joint between the three way connection, first clamp joint is direct clamp joint.

Preferably, a return spring is arranged around one end of the piston rod, which is positioned in the micro-resistance cylinder.

Preferably, the hard tube with be provided with the second clamp joint between the hinder jar a little, the second clamp joint is 90 clamp joints.

Preferably, an end cover is arranged around the outer portion of the oil storage cylinder, and the end cover is fixed to the oil storage cylinder through a hexagon screw.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the two valve clacks are pushed away stably under the action of medium thrust, meanwhile, pressure medium at an inlet enters an oil storage cylinder, the lower part of a piston pushes the piston, oil at the upper part of the piston is pressed into the tail ends of the small cylinders at two sides of the valve body respectively through needle valves, the small cylinder pistons of the small cylinders extend out, when the pressure of the medium at the inlet is lower than the pressure of an outlet, the medium flows back, the valve clacks are automatically closed under the action of a return spring and the medium, but because the piston rod is located at the extending position, the top valve clacks can not be completely closed and about 20% of area is reserved for the medium to pass through, so that the effect of eliminating water butts is achieved, the valve clacks are divided into quick closing and slow closing by the piston rod, the effects of preventing motor reversion and eliminating silence are achieved, and the integral body is small in size, light in weight, good in sealing performance and.

Drawings

The accompanying drawings 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 and not to limit the invention. In the drawings:

FIG. 1 is a side sectional view of the present invention;

FIG. 2 is a front sectional view of the present invention;

FIG. 3 is a schematic view of a partial structure of the present invention;

in the figure: 1. a valve body; 2. a valve flap; 3. a micro-resistance cylinder; 4. a return spring; 5. a reserve tube; 6. an end cap; 7. a needle valve; 8. a three-way joint; 9. a small cylinder; 10. a small cylinder piston; 11. a piston; 12. a first clamp connector; 13. a hard tube; 14. a second clamp connection; 15. a seal ring; 16. a flat head of the silencer; 17. a piston rod.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1

Referring to fig. 1-3, the present invention provides the following technical solutions: the micro-resistance slow-closing check valve comprises a valve body 1, a valve clack 2 is installed in the middle of the front face of the valve body 1, an oil storage cylinder 5 is installed above the valve body 1, a piston 11 is arranged inside the oil storage cylinder 5, the piston 11 penetrates through the oil storage cylinder 5 and extends to the outside of the oil storage cylinder 5, a small air cylinder 9 is arranged above the oil storage cylinder 5, a small air cylinder piston 10 is arranged inside the small air cylinder 9, the top end of the piston 11 penetrates through the small air cylinder 9 and extends to the inside of the small air cylinder 9, the piston 11 is connected with the small air cylinder piston 10, a needle valve 7 is installed right in front of the outside of the small air cylinder 9, the needle valve 7 penetrates through the small air cylinder 9 and extends to the inside of the small air cylinder 9, the needle valve 7 is connected with the other end of the small air cylinder piston 10, a three-way joint 8 is connected with the top end of the small air cylinder 9, the three-way, the micro-resistance cylinder 3 is symmetrically arranged on two sides of the interior of the valve body 1, the output end of the micro-resistance cylinder 3 is provided with a piston rod 17, the piston rod 17 penetrates through the micro-resistance cylinder 3 and extends to the exterior of the micro-resistance cylinder 3, and the other end of the hard tube 13 is communicated with the micro-resistance cylinder 3.

In this embodiment: the two valve clacks 2 are pushed away stably under the action of medium thrust, pressure medium at the inlet enters the oil storage cylinder 5, the lower part of the piston 11 pushes the piston 11, oil at the upper part of the piston 11 is pressed into the tail ends of the small cylinders 9 at the two sides of the valve body 1 respectively through the needle valves 7, the small cylinder pistons 10 of the small cylinders 9 extend out, when the pressure of the medium at the inlet is lower than the pressure of the outlet, the medium flows back, the piston rods 17 are located at the extending positions, the top valve clacks 2 cannot be closed completely, about 20% of area is left for the medium to pass through, and therefore the effect of eliminating water butts is achieved.

Specifically, a sealing ring 15 and a flat head 16 of a silencer are arranged outside the micro-resistance cylinder 3, and the sealing ring 15 is an O-shaped sealing ring; the rubber is soft and sealed, has good sealing performance, is wear-resistant and has long service life.

Specifically, the valve clacks 2 are in a semicircular structure, and the two valve clacks 2 are symmetrically arranged on the valve body 1; and blocking the connection and disconnection of the medium.

Specifically, a first clamp joint 12 is arranged between the hard pipe 13 and the three-way joint 8, and the first clamp joint 12 is a straight-through clamp joint; the sealing performance is improved.

Specifically, a return spring 4 is arranged around one end of the piston rod 17 positioned in the micro-resistance cylinder 3; the plug rod 17 is opened and closed stably, and vibration is reduced.

Specifically, a second hoop joint 14 is arranged between the hard pipe 13 and the micro resistance cylinder 3, and the second hoop joint 14 is a 90-degree hoop joint; the sealing performance is improved.

Specifically, an end cover 6 is arranged around the outer part of the oil storage cylinder 5, and the end cover 6 is fixed on the oil storage cylinder 5 through a hexagon screw; the sealing property of the reserve tube 5 is improved.

The utility model discloses a theory of operation and use flow: under the action of medium thrust, the two valve flaps 2 are pushed away stably, meanwhile, pressure medium at the inlet enters the oil storage cylinder 5, the lower part of the piston 11 pushes the piston 11, oil at the upper part of the piston 11 is respectively pressed into the tail ends of the small cylinders 9 at the two sides of the valve body 1 through the needle valves 7, so that the small cylinder pistons 10 of the small cylinders 9 extend out, when the pressure of the medium at the inlet is lower than the pressure of the outlet, the medium flows back, at the moment, the valve flaps 2 are automatically closed under the action of the return springs 4 and the medium, but because the piston rod 17 is at the extending position, the top valve flaps 2 cannot be completely closed, about 20 percent of area is left for the medium to pass through, thereby playing the role of eliminating water hammer, the valve flaps 2 are divided into quick closing and slow two-step closing by the piston rod 17, achieving the functions of preventing motor reversion and eliminating silence, and having small integral body, light weight and good sealing performance, the energy-saving effect is good.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. Micro-resistance slow-closing check valve, including valve body (1), its characterized in that: the valve clack (2) is installed to the positive intermediate position of valve body (1), oil storage cylinder (5) is installed to the top of valve body (1), the inside of oil storage cylinder (5) is provided with piston (11), piston (11) run through oil storage cylinder (5) and extend to the outside of oil storage cylinder (5), the top of oil storage cylinder (5) is provided with little cylinder (9), the inside of little cylinder (9) is provided with little cylinder piston (10), the top of piston (11) runs through little cylinder (9) and extends to the inside of little cylinder (9), piston (11) with little cylinder piston (10) are connected, needle valve (7) are installed just in the front of the outside of little cylinder (9), needle valve (7) run through little cylinder (9) and extend to the inside of little cylinder (9), needle valve (7) with the other end of little cylinder piston (10) is connected, the top of little cylinder (9) is connected with three way connection (8), three way connection (8) with little cylinder (9) are linked together, the other both ends symmetric connection of three way connection (8) has hard tube (13), the inside bilateral symmetry of valve body (1) is installed and is hindered jar (3) a little, the output that hinders jar (3) a little is provided with piston rod (17), piston rod (17) run through hinder jar (3) a little and extend to the outside that hinders jar (3) a little, the other end of hard tube (13) with hinder jar (3) a little and be linked together.

2. The check valve of claim 1, wherein: the micro-resistance cylinder (3) is provided with a sealing ring (15) and a flat head (16) of the silencer outside, and the sealing ring (15) is an O-shaped sealing ring.

3. The check valve of claim 1, wherein: the valve clack (2) is of a semicircular structure, the number of the valve clacks (2) is two, and the two valve clacks are symmetrically arranged on the valve body (1).

4. The check valve of claim 1, wherein: hard tube (13) with be provided with first clamp joint (12) between three way connection (8), first clamp joint (12) are direct clamp joint.

5. The check valve of claim 1, wherein: and a return spring (4) is arranged around one end of the piston rod (17) positioned in the micro-resistance cylinder (3).

6. The check valve of claim 1, wherein: hard tube (13) with be provided with second clamp joint (14) between micro-resistance jar (3), second clamp joint (14) are 90 clamp joints.

7. The check valve of claim 1, wherein: an end cover (6) is arranged around the outer portion of the oil storage cylinder (5), and the end cover (6) is fixed to the oil storage cylinder (5) through a hexagon screw.

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