CN212177961U - Multi-stage adjustable slow-closing check valve - Google Patents

Abstract

The utility model provides a multistage adjustable slow-closure check valve belongs to the valve field, which comprises a valve body, a valve seat, the valve plate, front end housing and cylinder body, the one end at the valve body is established to the disk seat, the front end housing, the inside cooperation of cylinder body and valve body sets up and forms the working chamber, the working chamber is equipped with the piston that matches the setting, piston and working chamber sliding connection, the valve plate is fixed as an organic whole with the valve rod, the valve rod is kept away from the one end and the piston fixed connection of valve plate, when the outer lane of piston and working chamber laminating set up, the state that two orifices all are between front end housing and piston is first slow stage of closing, the state that an orifice is all between front end housing and piston is the. The utility model discloses make the valve close stroke 70% fast, close 20% slowly again, the valve gate pole closes 10% slowly at the end, will close the medium in the slow-closure device cylinder body when targetting in place and can effectively prevent the valve plate to close fast, realizes the buffering of valve.

Description

Multi-stage adjustable slow-closing check valve

Technical Field

The utility model belongs to the valve field relates to multistage adjustable slow-closure check valve.

Background

The axial-flow type multistage adjustable slow-closing check valve is generally arranged at the outlet of a water pump, has the functions of slow closing and check, has the functions of fast closing, slow closing and final extremely slow closing, can effectively prevent the reverse rotation of a unit caused by the accident shutdown of a pump station, and prevents the damage of a water hammer to the pump and a pipeline. Particularly, when the water pump is shut down due to accidents, under the action of medium backflow and spring force of the valve, the valve is quickly impacted between the two sealing pairs when being closed in place, so that the sealing surface of the valve is damaged to cause leakage, the service life of the valve is influenced, a water hammer is eliminated, and the safety of the water pump and a pipeline is protected.

SUMMERY OF THE UTILITY MODEL

The to-be-solved problem of the utility model is to provide multistage adjustable slow stop valve, adopted the throttle regulation pole to adjust the mode of orifice latus rectum size and realize multistage adjustable slow function of closing, made the valve at the quick closing stroke 70%, close 20% again slowly, the valve gate pole closes 10% slowly at the end, is about to close the buffering that realizes the valve that the medium in the slow device cylinder body closed in place can effectively prevent the valve plate to close soon.

In order to solve the technical problem, the utility model discloses a technical scheme is: the multistage adjustable slow-closing check valve comprises a valve body, a valve seat, a valve plate, a front end cover and a cylinder body, wherein the valve seat is arranged at one end of the valve body, the front end cover, the cylinder body and the interior of the valve body are matched to form a working cavity, a piston is arranged in the working cavity in a matched mode, the piston is connected with the working cavity in a sliding mode, the valve plate and the valve rod are fixed into a whole, and one end, far away from the valve plate, of the valve rod is fixedly connected with the piston;

two throttling holes are formed in the valve body, the throttling holes are communicated with the interior of the valve body outside the working cavity, and throttling adjusting rods for adjusting flow are arranged in the throttling holes;

when the outer ring of the piston is attached to the working cavity, the state of two throttling holes between the front end cover and the piston is a first slow closing stage, and the state of one throttling hole between the front end cover and the piston is a second slow closing stage.

Furthermore, the one end that the valve rod was kept away from the valve plate pass behind the front end housing with piston fixed connection, the valve plate with be equipped with the spring that drives the valve plate motion between the front end housing, the valve plate with the disk seat cooperation realizes sealedly, the cylinder body is kept away from the one end of front end housing is equipped with a plurality of circulation holes, the front end housing be equipped with can only to the check valve that the cylinder body opened.

Furthermore, the first slow closing stage is 15% -20% of the full stroke, and the second slow closing stage is 5% -10% of the full stroke.

Further, the both ends of valve rod all are equipped with the step face, valve plate and piston are all fixed a position through the step face, the valve plate carries out the solid locking location through nut A and bullet pad and valve rod, the piston pass through nut B and bullet pad with the valve plate carries out the solid locking location.

Further, valve plate, valve rod and the coaxial setting of piston, the inner circle of valve plate with be equipped with two sealing washers between the valve rod, the piston with be equipped with the sealing washer between the valve rod.

Further, the valve rod protrudes out of the valve plate, a guide block is arranged on an inner ring of the valve seat, and one end, far away from the piston, of the valve rod penetrates through the guide block and is in sliding connection with the guide block.

Further, be equipped with the location body in the valve body, the fixed lock of front end housing sets up the sealing washer on the location body and between the two, the one end of front end housing stretches into the setting of location body, the cylinder body sets up the location body is kept away from the one end of front end housing, the internal diameter of cylinder body includes the seal section and keeps away the position section, the internal diameter of seal section with the internal diameter of the location body is the same.

Furthermore, in a sealed state, the throttling hole is arranged between the front end cover and the piston, the throttling hole is arranged in a 7-shaped mode, the throttling adjusting rod extends into the throttling hole from the upper end of the valve body, and a sealing ring is arranged between the throttling adjusting rod and the valve body.

Furthermore, the throttling regulation rod is fixedly connected with the valve body through a flange seat in threaded connection, the flange seat is connected with the valve body through threads, a part of the throttling regulation rod, which protrudes upwards from the flange seat, is provided with a locking nut, the part of the throttling regulation rod, which protrudes upwards from the locking nut, is of a multi-plane structure, the lower end of the throttling regulation rod is conical and extends into the vertical section of the throttling hole, and the inner diameter of the vertical section of the throttling hole is smaller than that of the horizontal section.

Furthermore, the check valve comprises a floating ball, a positioning seat and a return spring, the positioning seat is provided with a hole for medium to flow, the front end cover is provided with a check hole, the return spring is arranged between the floating ball and the positioning seat and has pre-pressure on the floating ball, and the diameter of the floating ball is larger than that of the check hole.

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

1. The utility model discloses the structure is one-way reliable and stable, through the setting of spring, realizes that the valve is under the medium motion open and closed state adjustment, and the check valve of setting has realized the intercommunication of medium to the working chamber, moves the piston to the cylinder body direction, has realized opening of valve, and when closing the valve, the check valve is closed, has realized the function against current, and simple structure effectively realizes the counter current, and stability is high;

2. the multi-stage adjustable slow closing function is realized by adopting a mode of adjusting the drift diameter of the throttling hole by the throttling rod. The valve is enabled to be in 70% of quick closing stroke, then to be slowly closed by 20%, and finally to be slowly closed by 10%, and when the valve is to be closed in place, the medium in the cylinder body of the slow closing device can effectively prevent the valve plate from being quickly closed, so that the buffering of the valve and the removal of water hammer are realized, and the safety of a water pump and a pipeline is protected.

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 sectional view of the multi-stage adjustable slow-closing check valve of the present invention in a closed state;

FIG. 2 is a sectional view of the multi-stage adjustable slow-closing check valve of the present invention in a fully opened state;

FIG. 3 is a partial enlarged view of the multi-stage adjustable slow-closing check valve of the present invention in a fully opened state;

FIG. 4 is a partial enlarged view of the multi-stage adjustable slow-closing check valve of the present invention when it enters the quick-closing state;

FIG. 5 is a partial enlarged view of the multi-stage adjustable slow-closing check valve of the present invention entering the first slow-closing stage;

FIG. 6 is a partial enlarged view of the multi-stage adjustable slow shut check valve of the present invention entering the second slow shut stage;

fig. 7 is an enlarged view of a portion a of fig. 2 according to the present invention.

Reference numerals:

1. a valve body; 101. a positioning body; 2. a valve seat; 21. a guide block; 3. a one-way valve; 31. a floating ball; 32. a return spring; 33. positioning seats; 4. a valve plate; 5. a nut A; 6. a valve stem; 7. a spring; 8. a front end cover; 81. a one-way hole; 9. A cylinder body; 91. a flow-through hole; 10. a rear end cap; 11. a nut B; 12. a piston; 13. a piston seal ring; 14. a throttle adjusting lever; 141. an orifice; 142. a flange seat; 143. locking the nut; 20. a working chamber.

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. 1-7, the utility model relates to a multistage adjustable slow-closure check valve, including valve body 1, valve seat 2, the valve plate, front end housing 8 and cylinder body 9, valve seat 2 is established in the one end of valve body 1, front end housing 8, the inside cooperation setting of cylinder body 9 and valve body 1 forms the working chamber, be equipped with the piston 12 that matches the setting in the working chamber, the valve plate is fixed as an organic whole with the valve rod, the one end that the valve rod kept away from the valve plate passes front end housing 8 after and piston 12 fixed connection, be equipped with the spring 7 that drives the valve plate motion between valve plate and the front end housing 8, the valve plate cooperates with valve seat 2 to realize sealing, the one end that the cylinder body 9 kept away from front;

the front end cover 8 is provided with a check valve 3 which can only be opened to the cylinder 9, the valve body 1 is provided with a throttle hole 141, the throttle hole 141 is communicated with the inside of the valve body 1 outside the working chamber, and a throttle adjusting rod 14 for adjusting the flow rate is arranged in the throttle hole 141.

Preferably, the two ends of the valve rod are provided with step surfaces, the valve plate and the piston 12 are positioned through the step surfaces, the valve plate is fixedly locked and positioned with the valve rod through a nut A5 and an elastic pad, the piston 12 is fixedly locked and positioned with the valve plate through a nut B11 and an elastic pad, the structure is simple, the positioning is firm, more preferably, the valve plate, the valve rod and the piston 12 are coaxially arranged, two sealing rings are arranged between the inner ring of the valve plate and the valve rod, and the sealing rings are arranged between the piston 12 and the valve rod, so that the structural stability is high; more preferably, the valve rod protrudes out of the valve plate, the inner ring of the valve seat 2 is provided with a guide block 21, one end of the valve rod, which is far away from the piston 12, penetrates through the guide block 21 and is in sliding connection with the guide block 21, and the movement precision of the valve rod is improved after the guide block 21 is arranged.

Preferably, a positioning body 101 is arranged in the valve body 1, the front end cover 8 is fixedly locked on the positioning body 101, a sealing ring is arranged between the front end cover and the positioning body 101, one end of the front end cover extends into the positioning body 101, the cylinder body 9 is arranged at one end of the positioning body 101 far away from the front end cover 8, the cylinder body 9 is fixedly connected with the positioning body 101 through the rear end cover 10, the inner diameter of the cylinder body 9 comprises a sealing section and a position avoiding section, the inner diameter of the sealing section is the same as that of the positioning body 101, the inner diameter of the position avoiding section is larger than that of the sealing section,

preferably, two throttle holes 141 are arranged on the valve body 1, the throttle holes 141 are communicated with the interior of the valve body 1 outside the working cavity, throttle adjusting rods 14 for adjusting flow are arranged in the throttle holes 141, when the outer ring of the piston 12 is attached to the working cavity, the state of each of the two throttle holes 141 between the front end cover 8 and the piston 12 is a first slow closing stage, the state of each of the two throttle holes 141 between the front end cover 8 and the piston 12 is a second slow closing stage, the first slow closing stage is 15% -20% of the full stroke, preferably 20%, and the second slow closing stage is 5% -10% of the full stroke, preferably 10%.

Preferably, in a sealed state, the throttle hole 141 is arranged between the front end cover 8 and the piston 12, the throttle hole 141 is arranged in a 7-shaped manner, the throttle adjusting rod 14 extends into the throttle hole 141 from the upper end of the valve body 1, a sealing ring is arranged between the throttle adjusting rod 14 and the valve body 1, and all the sealing rings arranged in the structure adopt a conventional O-shaped sealing ring or other equivalent structures.

Preferably, the throttle adjusting lever 14 is fixedly connected with the valve body 1 through a flange seat 142 in threaded connection, the flange seat 142 is in threaded connection with the valve body 1, a locking nut 143 is arranged on a part of the throttle adjusting lever 14, which protrudes upwards out of the flange seat 142, the throttle adjusting lever 14 is placed to be loose, the stability of throttling is guaranteed, and a part of the throttle adjusting lever 14, which protrudes upwards out of the locking nut 143, is of a multi-plane structure, so that clamping of a wrench and the like is facilitated, and the convenience of operation is improved.

Preferably, the lower end of the throttle adjusting rod 14 is conical and extends into the vertical section of the throttle hole 141, the inner diameter of the vertical section of the throttle hole 141 is smaller than the diameter of the horizontal section, which is beneficial to controlling the throttle amount and controlling the slow closing time, and the too large throttle hole 141 also has influence on the strength of the positioning body 101.

Preferably, the check valve 3 includes a floating ball 31, a positioning seat 33 and a return spring 32, a hole for medium to flow is formed in the positioning seat 33, a check hole 81 is formed in the front end cover 8, the return spring 32 is arranged between the floating ball 31 and the positioning seat 33 and pre-presses the floating ball 31, the diameter of the floating ball 31 is larger than that of the check hole 81, the structure is simple, the distance between the positioning seat 33 and the front end cover 8 is adjusted, adjustment of the elastic force of the return spring 32 can be achieved, it is guaranteed that the floating ball 31 and the check hole 81 are tightly attached, backflow of the medium is effectively prevented, stability is good, and applicability of the structure is stronger due to adjustment.

In actual operation, the valve of fig. 1 is in the closed state: when the water pump is started, a medium flows in from the water inlet (left side), the pressure of the water inlet (left side) is higher than the pressure of the downstream of the valve plate 4 (right side), at the moment, the thrust generated by the medium pressure and water flow to the valve plate 4 is loaded on the valve plate 4, the acting force of the spring 7 is overcome, meanwhile, the valve plate 4 drives the valve rod 6 and the piston 12 to move rightwards, the valve plate 4 and the valve rod 6 are integrated into a whole through a nut A5 and are integrated with the piston 12 through a nut B11, meanwhile, upstream medium water enters the left side of the cylinder body 9 and the piston 12 through the one-way valve 3, at the moment, the valve is;

when the water pump stops pumping, the valve in fig. 4 enters a quick-closing stroke, then a medium flows back to flow in from the valve (right side), the pressure of a water inlet (right side) of the valve is higher than the pressure of a valve plate 4 (left side), at this time, the thrust generated by the acting force of the medium pressure, water flow and a spring 7 on the valve plate 4 is loaded on the valve plate 4, the valve plate 4 drives a valve rod 6 and a piston 12 to move leftwards, meanwhile, the one-way valve 3 is closed, the medium water enters a piston cavity between a front end cover 8 and the piston 12, at the same time, the valve plate 4 drives the valve rod 6 and the piston 12 to move leftwards, at this time, the medium water in the piston cavity between the front end cover 8 and the piston 12 flows out through a throttle orifice at a throttle adjusting rod 14 and a large gap formed by a cylinder body, the piston 12 and a;

fig. 5 shows that when the valve enters a first slow closing stage, when the set fast closing stroke is finished, the valve will enter a slow closing stroke of 20% of the first stage, the stroke of this stage is under the action of the return flow of the medium and the spring 7, so that the valve plate 4 drives the piston 12 of the valve rod 6 to move leftward (i.e. the valve closing position), the fast and slow closing speed of the valve plate 4 is adjusted by the medium water between the piston 12 and the front end cover 8 through the orifices at two positions of the two throttle adjusting rods 14 to flow out, and the two throttle adjusting rods 14 can control the outflow speed and the outflow time of the medium of the orifices, thereby realizing the slow closing of 20% of the full stroke of the valve (the first slow closing stage);

when the 20% slow closing stroke of the first stage is finished, the valve enters the 10% ultra-slow closing stroke of the second stage, namely the valve is slowly closed when being closed in place, and the buffering of the valve is realized.

Fig. 6 shows that the valve enters the second slow-closing stage, the stroke of this stage is that under the action of the return flow of the medium and the spring 7, the valve plate 4 drives the piston 12 of the valve rod 6 to move leftwards, the closing speed of the valve plate 4 is adjusted by the medium water in the piston cavity between the piston 12 and the front end cover 8 only through the throttle hole 141 near the throttle adjusting rod 14 of the front end cover, and the throttle adjusting rod 14 near the front end cover 8 can control the medium outflow speed and outflow time of the throttle hole 141, so that the slow-closing speed of 10% of the full stroke (second stage slow-closing) of the valve is adjusted, and the valve is buffered when closed in place, thereby avoiding the rapid impact between the two seal pairs, causing the seal surface of the valve to be damaged to cause leakage, and affecting the service life of the valve.

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. Multistage adjustable slow-closure check valve, its characterized in that: the valve comprises a valve body, a valve seat, a valve plate, a front end cover and a cylinder body, wherein the valve seat is arranged at one end of the valve body, the front end cover, the cylinder body and the interior of the valve body are matched to form a working cavity, a piston which is matched with the working cavity is arranged in the working cavity, the piston is in sliding connection with the working cavity, the valve plate and a valve rod are fixed into a whole, and one end, far away from the valve plate, of the valve rod is fixedly connected with the piston;

two throttling holes are formed in the valve body, the throttling holes are communicated with the interior of the valve body outside the working cavity, and throttling adjusting rods for adjusting flow are arranged in the throttling holes;

when the outer ring of the piston is attached to the working cavity, the state of two throttling holes between the front end cover and the piston is a first slow closing stage, and the state of one throttling hole between the front end cover and the piston is a second slow closing stage.

2. The multi-stage adjustable slow-closing check valve of claim 1, wherein: the valve rod is kept away from the one end of valve plate pass behind the front end housing with piston fixed connection, the valve plate with be equipped with the spring that drives the valve plate motion between the front end housing, the valve plate with the disk seat cooperation is realized sealedly, the cylinder body is kept away from the one end of front end housing is equipped with a plurality of circulation holes, the front end housing be equipped with can only to the check valve that the cylinder body opened.

3. The multi-stage adjustable slow-closing check valve of claim 1, wherein: the first slow closing stage is 15% -20% of the full stroke, and the second slow closing stage is 5% -10% of the full stroke.

4. The multi-stage adjustable slow-closing check valve of claim 1, wherein: the two ends of the valve rod are provided with step surfaces, the valve plate and the piston are positioned through the step surfaces, the valve plate is fixedly locked and positioned with the valve rod through a nut A and an elastic pad, and the piston is fixedly locked and positioned with the valve plate through a nut B and an elastic pad.

5. The multi-stage adjustable slow-closing check valve of claim 4, wherein: the valve plate, the valve rod and the piston are coaxially arranged, two sealing rings are arranged between the inner ring of the valve plate and the valve rod, and the sealing rings are arranged between the piston and the valve rod.

6. The multi-stage adjustable slow-closing check valve of claim 1, wherein: the valve rod protrudes out the valve plate is arranged, a guide block is arranged on the inner ring of the valve seat, and one end, far away from the piston, of the valve rod penetrates through the guide block and is in sliding connection with the guide block.

7. The multi-stage adjustable slow-closing check valve of claim 1, wherein: be equipped with the location body in the valve body, the fixed lock of front end housing is in on the location body and set up the sealing washer between the two, the one end of front end housing stretches into the setting of location body, the cylinder body sets up the location body is kept away from the one end of front end housing, the internal diameter of cylinder body includes the seal segment and keeps away the position section, the internal diameter of seal segment with the internal diameter of the location body is the same.

8. The multi-stage adjustable slow-closing check valve of claim 1, wherein: in a sealed state, the throttling hole is arranged between the front end cover and the piston, the throttling hole is arranged in a 7-shaped mode, the throttling adjusting rod extends into the throttling hole from the upper end of the valve body, and a sealing ring is arranged between the throttling adjusting rod and the valve body.

9. The multi-stage adjustable slow-closing check valve of claim 7, wherein: the throttling adjusting rod is fixedly connected with the valve body through a flange seat in threaded connection, the flange seat is connected with the valve body through threads, a part, protruding upwards, of the throttling adjusting rod is provided with a locking nut, a part, protruding upwards, of the throttling adjusting rod is of a multi-plane structure, the lower end of the throttling adjusting rod is conical and extends into the vertical section of the throttling hole, and the inner diameter of the vertical section of the throttling hole is smaller than the diameter of the horizontal section.

10. The multi-stage adjustable slow-closing check valve of claim 2, wherein: the check valve comprises a floating ball, a positioning seat and a return spring, wherein a hole for medium to flow is formed in the positioning seat, a check hole is formed in the front end cover, the return spring is arranged between the floating ball and the positioning seat and has pre-pressure on the floating ball, and the diameter of the floating ball is larger than that of the check hole.

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