Axial flow check valve for municipal piping

Abstract

The application discloses a municipal pipeline axial flow check valve, and relates to the technical field of check valves, which comprises a liquid inlet pipe and a liquid outlet pipe, a valve body shell is fixedly arranged between the liquid inlet pipe and the liquid outlet pipe, a limiting shell is arranged on the inner side of the valve body shell, the inner end of the liquid outlet pipe is fixedly connected with the limiting shell through a flow guide fixing block, a valve rod is slidably arranged in the limiting shell, a valve clack is fixedly arranged on the outer end of the valve rod, a close sealing ring is fixedly arranged on the inner end of the liquid inlet pipe, a first spring is arranged on the outer side of the valve rod in the limiting shell, the valve rod is provided with a limiting portion, and a guide groove matched with the limiting portion is formed in the inner side of the limiting shell. The application can guide the municipal water flowing through the flow guide fixing block, and can fix the limiting shell. The valve clack, the valve rod, the first spring and the close sealing ring are matched to control the opening and closing of the valve body. The guide groove and the limiting portion are matched to prevent the valve clack and the valve rod from rotating.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of check valves, in particular to an axial flow check valve for municipal pipelines. BACKGROUND

[0002] The axial flow check valve for municipal use is an automatic control device widely used in municipal water supply, drainage, sewage treatment and other fluid pipeline systems. Its main function is to prevent backflow of fluid and ensure one-way flow of water to protect pipelines and equipment from damage caused by backflow. The axial flow check valve adopts an axial flow structure, which has lower fluid resistance and better flow capacity compared to traditional butterfly valves and ball valves.

[0003] The working principle of the axial flow check valve is very simple and efficient, and it is internally provided with a valve disc perpendicular to the valve seat. The valve disc is automatically opened or closed by the pressure and gravity of the fluid. When the fluid flows in the predetermined direction, the water flow pushes the valve disc to open, allowing the water flow to pass. When the water flow reverses, the fluid pressure decreases, and the valve disc closes under the action of gravity, thereby preventing backflow of water. The axial flow check valve is widely used in urban water supply, drainage systems, sewage treatment plants, fire protection systems, industrial water treatment and other fields. In particular, in high-pressure and large-flow pipeline systems, the axial flow check valve can effectively prevent backflow and protect the safety of pump stations, pipe networks and other facilities.

[0004] The invention patent with the authorized publication number CN104847932B discloses an axial flow check valve. The invention realizes absolute locking between the bushing, valve body and valve sleeve by using a series of connection methods such as anti-rotation pins, anti-rotation rings and anti-backlash washers between the bushing, valve body and valve sleeve, preventing relative rotation between the bushing and valve body.

[0005] Although the above-mentioned device solves the problem of relative rotation between the valve body and the valve sleeve, it cannot slow down the speed of opening or closing the valve body, and the water hammer effect caused thereby is not alleviated. Uniformly slowing down the opening or closing of the valve body can protect the valve disc to some extent, avoid damaging the sealing surface, and effectively prolong the service life of the device. Therefore, an axial flow check valve that can prevent rotation of the valve disc and valve stem and also slow down the opening or closing is needed. SUMMARY

[0006] The purpose of the present application is to provide an axial flow check valve for municipal pipelines to solve the problems raised in the background.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0008] The utility model provides a kind of municipal pipeline axial flow check valve, including liquid inlet pipe and liquid outlet pipe, which is fixed between the liquid inlet pipe and liquid outlet pipe and is provided with valve body shell, the inside of valve body shell is provided with limit shell, the inner end of liquid outlet pipe is fixedly connected with limit shell by flow guide fixed block, the valve rod is slidably arranged in limit shell, the outer end of valve rod is fixedly provided with valve clack, the inner end of liquid inlet pipe is fixedly provided with abutting sealing ring, and the abutting sealing ring is correspondingly arranged with valve clack, the first spring is arranged in the outside of valve rod and inside limit shell, the limit portion is arranged on the valve rod, and the guide groove that cooperates with the limit portion is formed in the inside of limit shell;

[0009] The pressure dividing device is arranged above the valve body shell, the liquid inlet pipe is communicated with the pressure dividing device through the first connecting pipe, and the liquid outlet pipe is communicated with the pressure dividing device through the second connecting pipe.

[0010] The first cavity space is formed in the inside of the limit shell, the horizontal beam is fixedly arranged on the inner wall of the limit shell, the bevel gear transmission mechanism is rotatably arranged on one side of the horizontal beam through the rotating shaft, the limit fixed block is fixedly arranged on one side of the bevel gear transmission mechanism, the straight rack is arranged between the bevel gear transmission mechanism and the limit fixed block, and one of the gears of the bevel gear transmission mechanism is engaged with the straight rack.

[0011] The pressure dividing device comprises a second outer shell, the second piston is slidably arranged in the inside of the second outer shell, and the outer end of the straight rack is fixedly connected with the lower end surface of the second piston, the third piston is arranged above the second piston in the inside of the second outer shell, the third cavity space is formed between the second piston and the third piston, the liquid passage is formed in the middle of the third piston and matched with the first connecting pipe and the second connecting pipe, the third spring is arranged above the third piston in the inside of the second outer shell, and the air hole is formed in the second outer shell.

[0012] The buffer device is arranged on one side of the limit shell, the buffer device comprises a first outer shell, the inner end of the first outer shell is fixedly connected with the limit shell, the inner shell is fixedly arranged in the inside of the first outer shell, the second cavity space is formed between the first outer shell and the inner shell, a plurality of flow holes are uniformly formed in the inner shell, the moving rod is slidably arranged in the inside of the first outer shell, the first piston is fixedly arranged in the inner end of the moving rod, and the second spring is arranged on one side of the moving rod in the inside of the inner shell.

[0013] The first piston and the second cavity space are filled with oil.

[0014] As a further scheme of the utility model, the sealing shell is fixedly arranged between the valve body shell and the limit shell on the outside of the straight rack.

[0015] As a further scheme of the present application: the third cavity space is filled with air.

[0016] As a further scheme of the present application: the second housing top is fixedly provided with a second boss.

[0017] As a further scheme of the present application: the first piston outer diameter is the same as the inner housing inner diameter.

[0018] As a further scheme of the present application: the mobile rod outer end is provided with an inner groove matched with the valve rod.

[0019] As a further scheme of the present application: the second spring inner side is located at the first housing bottom and is fixedly provided with a first boss.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] The flow guide fixed block guides the municipal water flowing therethrough and fixes the limiting housing, the valve flap, the valve rod, the first spring and the abutting sealing ring cooperate to control the opening and closing of the valve body, the guide groove and the limiting portion cooperate to prevent the valve flap and the valve rod from rotating;

[0022] When the valve rod is opened, the mobile rod, the first piston and the second spring cooperate to provide resistance, the mobile rod and the first piston move to the first boss side, the first piston is resisted by the second spring, and the oil liquid located at the first boss side is fed into the second cavity space through the flow holes, and then the oil liquid in the second cavity space is fed into the space on the mobile rod side through the flow holes, so that the valve rod drives the valve flap to open slowly, reduces the influence of the negative water hammer effect, the first boss limits the first piston and prevents the second spring from being excessively compressed, the valve rod and the mobile rod are slidingly connected, the buffer device does not affect the reset speed of the valve rod (the reset only relies on the elastic force of the second spring in the buffer device, so the reset time is relatively long), prevents the valve flap and the valve rod from not closing in time, and improves the practicality of the device.

[0023] The valve rod displacement drives the straight rack to move, so that the second piston is displaced and is transmitted to the third piston through the air in the third cavity space (the principle of compressible and expandable air is utilized, which can also delay the moving speed of the third piston), the liquid passage serves as a bridge to connect the first connecting pipe and the second connecting pipe, reduces the pressure of the municipal water in the liquid inlet pipe on the valve flap, slows down the opening or closing speed of the valve flap, protects the valve body to a certain extent, the second boss limits the movement and prevents the third spring from being excessively compressed. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a three-dimensional structure schematic view of the present application.

[0025] Figure 2 is a schematic view of the front structure of the present application.

[0026] Figure 3 is a schematic view of the top structure of the present application.

[0027] Figure 4 is a schematic view of the front structure of the present application. Figure 2

[0028] Figure 5 is a schematic view of the front structure of the present application. Figure 3

[0029] Figure 6 is a schematic view of the front structure of the present application. Figure 5

[0030] Figure 7 is a schematic view of the front structure of the present application. Figure 3

[0031] Figure 8 is a schematic view of the front structure of the present application.

[0032] Figure 9 is a schematic view of the front structure of the present application.

[0033] Figure 10 is a schematic view of the front structure of the present application.

[0034] Figure 11 is a schematic view of the front structure of the present application.

[0035] Figure 12 is a schematic view of the front structure of the present application.

[0036] ​​​​Reference signs annotation: 1, liquid inlet pipe; 2, liquid outlet pipe; 3, valve body shell; 4, valve flap; 41, fit sealing ring; 5, valve stem; 51, inner rack; 6, limiting shell; 7, first spring; 8, first cavity space; 9, flow guide fixed block; 10, guide groove; 11, limiting portion; 12, crossbeam; 13, bevel gear transmission mechanism; 14, limiting fixed block; 15, straight rack; 16, sealing shell; 17, buffer device; 171, first outer shell; 172, inner shell; 173, second cavity space; 174, overflow hole; 175, first boss; 176, moving rod; 177, first piston; 178, second spring; 179, inner recess; 18, pressure dividing device; 181, second outer shell; 182, second piston; 183, third cavity space; 184, third piston; 185, liquid passage; 186, third spring; 187, second boss; 188, air vent; 19, first connecting pipe; 20, second connecting pipe. DETAILED DESCRIPTION

[0037] The following embodiments will be described in detail with reference to the accompanying drawings. In the drawings or description, similar or identical parts are designated by the same reference numerals, and in practical applications, the shape, thickness or height of each component can be enlarged or reduced. The embodiments listed in the present application are only used to illustrate the present application and are not used to limit the scope of the present application. Any obvious modification or change made to the present application does not deviate from the spirit and scope of the present application.

[0038] Embodiment: please refer to Figures 1-12 In the embodiment of the present application, a municipal pipeline axial flow check valve comprises a liquid inlet pipe 1 and a liquid outlet pipe 2, a valve body shell 3 is fixedly arranged between the liquid inlet pipe 1 and the liquid outlet pipe 2, a limiting shell 6 is arranged on the inner side of the valve body shell 3, the inner end of the liquid outlet pipe 2 is fixedly connected with the limiting shell 6 through a flow guide fixed block 9, a valve stem 5 is slidably arranged in the limiting shell 6, a valve flap 4 is fixedly arranged on the outer end of the valve stem 5, a fit sealing ring 41 is fixedly arranged on the inner end of the liquid inlet pipe 1 and corresponds to the valve flap 4, a first spring 7 is arranged on the outer side of the valve stem 5 in the limiting shell 6, the valve stem 5 is provided with a limiting portion 11, a guide groove 10 corresponding to the limiting portion 11 is formed in the inner side of the limiting shell 6, the flow guide fixed block 9 guides the municipal water flowing through and also fixes the limiting shell 6, the valve flap 4, the valve stem 5, the first spring 7 and the fit sealing ring 41 cooperate to control the opening and closing of the valve body, and the guide groove 10 and the limiting portion 11 cooperate to prevent the valve flap 4 and the valve stem 5 from rotating.

[0039] The valve body shell 3 is provided with a pressure dividing device 18, the liquid inlet pipe 1 is communicated with the pressure dividing device 18 through a first connecting pipe 19, and the liquid outlet pipe 2 is communicated with the pressure dividing device 18 through a second connecting pipe 20.

[0040] The first cavity space 8 is arranged inside the limiting shell 6, a crossbeam 12 is fixedly arranged inside the first cavity space 8 and the inner wall of the limiting shell 6, one side of the crossbeam 12 is rotatably arranged with a bevel gear transmission mechanism 13 through a rotating shaft, one side of the bevel gear transmission mechanism 13 is fixedly arranged with a limiting fixed block 14, a straight rack 15 is arranged between the bevel gear transmission mechanism 13 and the limiting fixed block 14 and the straight rack 15 is engaged with one of the gears of the bevel gear transmission mechanism 13, an inner rack 51 is arranged on the valve rod 5 and the inner rack 51 is engaged with the other gear of the bevel gear transmission mechanism 13, the straight rack 15 is connected with the pressure dividing device 18 through the limiting shell 6 and the valve body shell 3, a sealing shell 16 is fixedly arranged outside the straight rack 15 between the valve body shell 3 and the limiting shell 6, the bevel gear transmission mechanism 13 is driven to rotate through the inner rack 51 in the valve rod 5, and then the straight rack 15 is driven to displace up and down, so as to control the opening and closing of the pressure dividing device 18.

[0041] The limiting shell 6 is provided with a buffer device 17 on one side, the buffer device 17 includes a first outer shell 171, the inner end of the first outer shell 171 is fixedly connected with the limiting shell 6, the inner side of the first outer shell 171 is fixedly provided with an inner shell 172, a second cavity space 173 is formed between the first outer shell 171 and the inner shell 172, a plurality of flow holes 174 are uniformly formed on the inner shell 172, a moving rod 176 is slidably arranged in the first outer shell 171, a first piston 177 is fixedly arranged at the inner end of the moving rod 176, the outer diameter of the first piston 177 is the same as the inner diameter of the inner shell 172, an inner recess 179 is formed at the outer end of the moving rod 176 and matched with the valve rod 5, a second spring 178 is arranged at one side of the moving rod 176 and located in the inner shell 172, a first boss 175 is fixedly arranged at the bottom of the first outer shell 171 and located in the second spring 178, the first piston 177 and the second cavity space 173 are filled with oil, through the cooperation of the moving rod 176, the first piston 177 and the second spring 178, resistance is provided when the valve rod 5 is opened, the moving rod 176 and the first piston 177 move to one side of the first boss 175, the first piston 177 is resisted by the second spring 178, at the same time, the oil located at one side of the first boss 175 is fed into the second cavity space 173 through the plurality of flow holes 174, and then the oil in the second cavity space 173 is fed into the space on one side of the moving rod 176 through the plurality of flow holes 174, so that the valve rod 5 drives the valve disc 4 to slowly open, the influence of the negative water hammer effect is reduced, the first boss 175 limits the first piston 177, and the second spring 178 is prevented from being excessively compressed, the valve rod 5 and the moving rod 176 are slidably connected, the buffer device 17 does not affect the reset speed of the valve rod 5 (the reset only relies on the elastic force of the second spring 178 in the buffer device 17, so the reset time is relatively long), the valve disc 4 and the valve rod 5 are prevented from not being able to be closed in time, and the practicality of the device is improved.

[0042] The partial pressure device 18 includes a second outer housing 181, a second piston 182 is arranged inside the second outer housing 181 and a straight rack 15 outer end is fixedly connected with a lower end surface of the second piston 182, a third piston 184 is arranged above the second piston 182 inside the second outer housing 181, a third cavity space 183 is formed between the second piston 182 and the third piston 184, the third cavity space 183 is filled with air, a liquid passage 185 is arranged in a middle part of the third piston 184 and cooperates with a first connecting pipe 19 and a second connecting pipe 20, a third spring 186 is arranged above the third piston 184 inside the second outer housing 181, a second boss 187 is fixedly arranged on a top of the second outer housing 181, an air hole 188 is arranged on the second outer housing 181, the valve rod 5 is displaced to drive the straight rack 15 to move, so that the second piston 182 is displaced, the air in the third cavity space 183 is transmitted to the third piston 184 to move (by using the principle that air can be compressed and expanded, the moving speed of the third piston 184 can also be delayed), the liquid passage 185 is used as a bridge to connect the first connecting pipe 19 and the second connecting pipe 20, the pressure of the municipal water in the liquid inlet pipe 1 on the valve disc 4 is reduced, the opening or closing speed of the valve disc 4 is slowed down, the valve body is protected to a certain extent, the second boss 187 plays a limiting role and also prevents the third spring 186 from being excessively compressed.

[0043] When the device is used, the municipal water in the inlet pipe 1 pushes the valve disc 4 and the valve rod 5 to move to the side of the outlet pipe 2, the first spring 7 is compressed, the inner rack 51 on the valve rod 5 is driven by the bevel gear transmission mechanism 13 to drive the straight rack 15 to move upwards, so that the second piston 182 moves upwards, the air in the third cavity space 183 is compressed, and the third piston 184 is also forced to move upwards, and the third spring 186 is compressed. When the liquid passage 185 gradually communicates with the first connecting pipe 19 and the second connecting pipe 20, the municipal water in the inlet pipe 1 is directly divided into the outlet pipe 2, so that the pressure in the inlet pipe 1 decreases, the force applied to the valve disc 4 and the valve rod 5 decreases, and the opening speed of the valve disc 4 and the valve rod 5 is delayed. When the valve rod 5 moves, the pressure is applied to the moving rod 176, and the second spring 178 provides part of the resistance. The oil on one side of the first boss 175 is fed to the second cavity space 173 through a plurality of flow holes 174, and then the oil in the second cavity space 173 is fed to the space on one side of the moving rod 176 through a plurality of flow holes 174, thereby providing another part of the resistance, further delaying the opening speed of the valve disc 4 and the valve rod 5. When the valve disc 4 and the valve rod 5 are completely opened, the straight rack 15 rises to the highest point, and the third piston 184 also moves to the highest position. At this time, the third piston 184 blocks the communication of the first connecting pipe 19 and the second connecting pipe 20, and the municipal water in the inlet pipe 1 directly flows to the outlet pipe 2 through the valve disc 4. When the device is closed, the valve disc 4 and the valve rod 5 move to the side of the inlet pipe 1, the valve rod 5 is separated from the inner recess 179, the moving rod 176 and the first piston 177 are gradually restored under the elastic force of the second spring 178, the second piston 182 descends under the driving of the straight rack 15, and the third piston 184 also descends. The air in the third cavity space 183 is expanded, the moving speed of the valve disc 4 and the valve rod 5 is delayed, and when the third piston 184 descends to a certain height, the liquid passage 185 gradually communicates with the first connecting pipe 19 and the second connecting pipe 20. The municipal water in the inlet pipe 1 is directly divided into the outlet pipe 2, avoiding the repeated pressure condition (water hammer effect) at the inlet pipe 1, promoting the valve disc 4 to block the inlet pipe 1, and prolonging the service life of the valve body.

[0044] It is apparent to those skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments, and that the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0045] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature or implementation described herein. The specification can include implicit combinations of explicitly mentioned features and / or implicit combinations of implicitly mentioned features. Such combinations are also expressly included within the scope of the specification and an embodiment.

Claims

1. An axial flow check valve for municipal pipelines, comprising an inlet pipe (1) and an outlet pipe (2), characterized in that, A valve body shell (3) is fixedly installed between the inlet pipe (1) and the outlet pipe (2). A limiting shell (6) is provided inside the valve body shell (3). The inner end of the outlet pipe (2) is fixedly connected to the limiting shell (6) by a flow guide fixing block (9). A valve stem (5) is slidably installed inside the limiting shell (6). A valve disc (4) is fixedly installed at the outer end of the valve stem (5). A sealing ring (41) is fixedly installed at the inner end of the inlet pipe (1) and the sealing ring (41) is correspondingly installed with the valve disc (4). A first spring (7) is installed on the outer side of the valve stem (5) inside the limiting shell (6). A limiting part (11) is provided on the valve stem (5). A guide groove (10) that cooperates with the limiting part (11) is opened on the inner side of the limiting shell (6). A pressure dividing device (18) is provided above the valve body shell (3). The inlet pipe (1) is connected to the pressure dividing device (18) through the first connecting pipe (19), and the outlet pipe (2) is connected to the pressure dividing device (18) through the second connecting pipe (20). The inner side of the limiting housing (6) is provided with a first cavity space (8). A crossbeam (12) is fixedly provided on the inner side of the first cavity space (8) and the inner wall of the limiting housing (6). A bevel gear transmission mechanism (13) is rotatably provided on one side of the crossbeam (12) via a rotating shaft. A limiting block (14) is fixedly provided on one side of the bevel gear transmission mechanism (13). A rack (15) is provided between the bevel gear transmission mechanism (13) and the limiting block (14), and the rack (15) meshes with one of the gears in the bevel gear transmission mechanism (13). An internal rack (51) is provided on the valve stem (5), and the internal rack (51) meshes with another gear in the bevel gear transmission mechanism (13). The rack (15) passes through the limiting housing (6) and the valve body shell (3) and is connected to the pressure dividing device (18). The pressure dividing device (18) includes a second outer shell (181), a second piston (182) is slidably disposed inside the second outer shell (181), and the outer end of the rack (15) is fixedly connected to the lower end face of the second piston (182). A third piston (184) is disposed inside the second outer shell (181) above the second piston (182). A third cavity space (183) is formed between the second piston (182) and the third piston (184). A liquid passage (185) is opened in the middle of the third piston (184) to cooperate with the first connecting pipe (19) and the second connecting pipe (20). A third spring (186) is disposed above the third piston (184) inside the second outer shell (181). A vent hole (188) is opened on the second outer shell (181). A buffer device (17) is provided on one side of the limiting housing (6). The buffer device (17) includes a first outer shell (171). The inner end of the first outer shell (171) is fixedly connected to the limiting housing (6). An inner shell (172) is fixedly provided on the inner side of the first outer shell (171). A second cavity space (173) is formed between the first outer shell (171) and the inner shell (172). A plurality of flow holes (174) are evenly opened on the inner shell (172). A moving rod (176) is slidably provided on the inner side of the first outer shell (171). A first piston (177) is fixedly provided on the inner end of the moving rod (176). A second spring (178) is provided on one side of the moving rod (176) located inside the inner shell (172). The first piston (177) is filled with oil on both sides and the second cavity space (173).

2. The axial flow check valve for municipal pipelines according to claim 1, characterized in that, A sealing housing (16) is fixedly installed between the valve body shell (3) and the limiting housing (6) on the outside of the straight rack (15).

3. The axial flow check valve for municipal pipelines according to claim 1, characterized in that, The third cavity space (183) is filled with air.

4. The axial flow check valve for municipal pipelines according to claim 3, characterized in that, The second outer shell (181) has a second boss (187) fixedly provided on its top.

5. The axial flow check valve for municipal pipelines according to claim 1, characterized in that, The outer diameter of the first piston (177) is the same as the inner diameter of the inner shell (172).

6. The axial flow check valve for municipal pipelines according to claim 5, characterized in that, The outer end of the moving rod (176) is provided with an inner groove (179) that cooperates with the valve rod (5).

7. The axial flow check valve for municipal pipelines according to claim 1, characterized in that, The second spring (178) has a first boss (175) fixedly provided on the inner side of the bottom of the first outer shell (171).

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