CN220956840U - Special limit check valve - Google Patents
Special limit check valve Download PDFInfo
- Publication number
- CN220956840U CN220956840U CN202322231304.6U CN202322231304U CN220956840U CN 220956840 U CN220956840 U CN 220956840U CN 202322231304 U CN202322231304 U CN 202322231304U CN 220956840 U CN220956840 U CN 220956840U
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- 238000002955 isolation Methods 0.000 claims description 21
- 238000007789 sealing Methods 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 5
- 239000003921 oil Substances 0.000 description 62
- 238000013016 damping Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000033764 rhythmic process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- Fluid-Damping Devices (AREA)
Abstract
The utility model relates to a special limit check valve, which comprises a valve body, a valve cover, a valve clack and a slow-closing device, wherein the valve clack adopts a swing structure, and a rotating shaft of the valve clack penetrates out of the valve body to be connected with the slow-closing device; the slow-closing device is formed by fixedly connecting a rotor in an oil cylinder on a valve body, and slow-closing control parts are all arranged in the oil cylinder, so that the slow-closing device has the advantages of simple and compact structure, small volume, low cost, good slow-closing working performance and the like.
Description
Technical Field
The utility model belongs to the field of valves, and particularly relates to a quick-closing and slow-closing swing check valve. The utility model is suitable for valves for preventing medium backflow in medium unidirectional pipeline systems of water turbines, steam turbines, pump stations and the like.
Background
The swing check valve is widely applied to outlet pipelines of water turbines, steam turbines and pump stations, and is automatically closed when equipment is stopped, so that medium backflow is prevented, and equipment safety is protected. Because of incompressibility of liquid, the check valve used in the liquid pipeline, especially the large-caliber check valve, can generate great water hammer force when suddenly closed, and can spread back and forth along the pipeline, generate strong noise and destructive force, and can shatter equipment and pipelines in severe cases, thereby causing serious accidents. Therefore, the swing check valve is quickly closed in the first 75% of the stroke and slowly closed in the second 15% of the stroke in the whole closing stage of the valve clack, so that the closing time requirement can be met, the water hammer force can be reduced to the minimum, and the safety of system equipment and pipelines can be protected. At present, a swing check valve generally adopts a damping device which is additionally arranged on a rotating shaft which is connected with the valve clack and extends outwards to control the closing rhythm of the valve clack, so as to achieve the slow closing function.
At present, a straight-stroke hydraulic damping cylinder counter weight hammer structure is generally adopted, a valve clack is fixedly connected with a rotating shaft, the rotating shaft is driven to rotate under the action of a medium, the rotating shaft is movably connected with a piston rod of a damping cylinder through a connecting rod, the damping cylinder is movably connected with a valve body through a bracket, the rotation of the rotating shaft is converted into the linear motion of the piston rod, and the damping function of the hydraulic cylinder acts on the valve clack through the transmission chain, so that the closing rhythm of the valve clack is controlled. The main disadvantages are: the structure is complex, the control device is exposed outside, a safety isolation device is needed, the occupied space is large, and the cost is high; under the high pollution environment such as dust, the connection parts such as a connecting rod, a heavy hammer and the like are easy to accumulate dust, so that the transmission is insensitive or blocked, and the working reliability is affected.
Disclosure of Invention
Aiming at the defects existing in the prior art, the utility model provides the special limit check valve which has the advantages of simple and compact structure, small volume, low cost and good working reliability.
The technical scheme for realizing the utility model is as follows:
A special limit check valve comprises a valve body, a valve cover, a valve clack and a slow-closing device, wherein the valve clack adopts a swing type structure, and a rotating shaft of the valve clack penetrates out of the valve body to be connected with the slow-closing device; the method is characterized in that: the slow closing device is formed by installing a rotor in an oil cylinder; the oil cylinder consists of a stator, a top cover and a bottom cover, wherein the stator is of a cylindrical structure, two symmetrical fan-shaped inner cavities are arranged in the stator, the top cover and the bottom cover are arranged at two ends of the stator in a sealing manner, the fan-shaped inner cavities form a closed oil cavity, and the other end of the bottom cover is fixedly arranged on the valve body; the rotor is arranged in the stator, the shaft hole of the rotor is fixedly connected with the rotating shaft, symmetrical fan-shaped blades are arranged on two sides of the shaft hole, the outer circular arcs of the fan-shaped blades are in dynamic sealing fit with the inner wall of the fan-shaped inner cavity of the stator, and the two end surfaces of the rotor are respectively in dynamic sealing contact with the inner planes of the bottom cover and the top cover; two symmetrical isolation tables are arranged between the two fan-shaped inner cavities of the stator, each isolation table is provided with an inner arc which is in dynamic sealing fit with the outer arc of the rotor shaft hole, a group of parallel check valves and throttle valves are respectively arranged in the two isolation tables, the inlets of the check valves and the throttle valves are communicated with an oil cavity on one side of the rotor in the clockwise direction, and the outlets of the check valves and the throttle valves are communicated with the oil cavity on one side of the rotor in the anticlockwise direction; the inner planes of the top cover and the bottom cover are respectively provided with an oil groove, and the radian and the position of the oil groove are 75% of the stroke position of the rotor rotating clockwise.
Preferably, the inlets of the check valve and the throttle valve are communicated with the oil cavity on one side of the rotor clockwise through the arc-shaped groove on the inner plane of the top cover, and the outlets of the check valve and the throttle valve are communicated with the oil cavity on the inner plane of the bottom cover through the isolation table.
Preferably, the one-way valve consists of a steel ball and a spring, and is arranged in a valve cavity of the isolation table, the steel ball is arranged on an inner step of the valve cavity, and the spring is arranged between the steel ball and an inner plane of the top cover; the throttle valve is formed by installing a needle valve core in a throttle hole of the isolation table through threads.
Compared with the prior art, the utility model has the beneficial effects that: the slow-closing device is formed by fixedly connecting a rotor in an oil cylinder on a valve body, and slow-closing control parts are all arranged in the oil cylinder, so that the slow-closing device has the advantages of simple and compact structure, small volume, low cost, good slow-closing working performance and the like.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Fig. 2 is a sectional structural view of the stator of fig. 1 according to the present utility model.
Fig. 3 is a sectional structural view of the rotor of fig. 1 according to the present utility model.
Fig. 4 is a schematic cross-sectional view of the cylinder bottom cover of fig. 1 according to the present utility model.
Fig. 5 is a schematic cross-sectional view of the cylinder head of fig. 1 in accordance with the present utility model.
In the figure: 1 valve body, 2 valve clack, 3 valve gap, 4 bottom cover, 5 rotation axis, 6 stator, 7 rotor, 8 top cover, 9 check valve, 10 throttle valve, 11 oil return groove, 12 oil drain groove, 13 arc groove, 14 shaft hole, 15 isolation bench.
Detailed Description
The special limit check valve shown in fig. 1 comprises a valve body 1, a valve cover 3, a valve clack 2 and a slow closing device, wherein the valve clack 2 adopts a swing type structure, and a rotating shaft 5 of the valve clack 2 penetrates out of the valve body 1 to be connected with the slow closing device; the method is characterized in that: the slow closing device is formed by installing a rotor 7 in an oil cylinder; the oil cylinder consists of a stator 6, a top cover 8 and a bottom cover 4, wherein the stator 6 is of a cylindrical structure, and two symmetrical fan-shaped inner cavities are arranged in the stator 6, namely, the radial section of the stator 6 is two symmetrical fan-shaped arc surfaces, as shown in fig. 2. The top cover 8 and the bottom cover 4 are arranged at two ends of the stator 6 in a sealing way, a closed oil cavity is formed by the fan-shaped inner cavity, and the other end of the bottom cover 4 is fixedly arranged on the valve body 1; the rotor 7 is arranged in a fan-shaped inner cavity of the stator 6, a shaft hole 14 of the rotor 7 is fixedly connected with the rotating shaft 5, flat keys are adopted for fixedly connecting the rotor and the shaft hole, symmetrical fan-shaped blades are arranged on two sides of the shaft hole 14, as shown in figure 3, the outer circular arcs of the fan-shaped blades are in dynamic sealing fit with the inner wall of the fan-shaped inner cavity of the stator 6, two end surfaces of the rotor 7 are respectively in dynamic sealing contact with inner planes of the bottom cover 4 and the top cover 8, and the inner planes of the bottom cover 4 and the top cover 8 refer to oil cavity side planes; two symmetrical isolation tables 15 are arranged between the two fan-shaped inner cavities of the stator 6, the isolation tables 15 are provided with inner arcs which are in dynamic seal fit with the outer arcs of the shaft holes 14 of the rotor 7, the two fan-shaped inner cavities of the stator 6 are sealed and isolated, two sides of the isolation tables 15 are in open limit positions for the valve clack 2 when the rotor 7 rotates anticlockwise to be in contact with the isolation tables 15, as shown in fig. 4 and 5, a group of parallel check valves 9 and throttle valves 10 are respectively arranged in the isolation tables 15, the inlets of the check valves 9 and the throttle valves 10 are communicated with oil cavities on one side of the rotor 7 in the clockwise direction, and the outlets of the check valves 9 and the throttle valves 10 are communicated with the oil cavities on one side of the rotor 7 in the anticlockwise direction; the inner planes of the top cover 8 and the bottom cover 4 are respectively provided with an oil groove, the radian and the position of the oil groove are 75% of the stroke position of the rotor 7 rotated clockwise, namely, the radian of the rotor 7 rotated when the valve clack 2 is closed to 75%, and the radian can be in the range of 70-80%, and is optimally 75%. The oil groove on the top cover 8 is a right oil groove 12, the oil groove on the bottom cover 4 is a left oil groove 11, when the rotor 7 rotates at the oil groove, oil in an oil cavity in front of the rotor 7 rapidly passes through the right oil groove 12 and the left oil groove 11 and is discharged into the oil cavity behind the rotor 7, and the resistance of the oil in the oil cavity to the rotor 7 is small; when the rotor 7 rotates to leave the oil groove, the right oil groove 12 and the left oil groove 11 are simultaneously closed by the two end surfaces of the rotor 7, oil in an oil cavity in front of the rotor 7 flows in from an inlet of the throttle valve 10, flows back into an oil cavity in rear of the rotor 7 from an outlet of the throttle valve 10, and the resistance of the oil in the oil cavity to the rotor 7 is large, so that the rotating speed of the rotor 7 is reduced.
The inlets of the check valve 9 and the throttle valve 10 are communicated with an oil cavity on one side of the rotor 7 in the clockwise direction through an arc-shaped groove 13 on the inner plane of the top cover 8, as shown in fig. 5, and the outlets are communicated with an oil groove on the inner plane of the bottom cover 4 through a separation table 15, as shown in fig. 4.
The one-way valve 9 consists of a steel ball and a spring, and is arranged in a valve cavity of the isolation table 15, the steel ball is arranged on an inner step of the valve cavity, the spring is arranged between the steel ball and an inner plane of the top cover 8, and oil is prevented from flowing from an oil cavity on one side of the top cover 8 to an oil groove on one side of the bottom cover 4; the throttle valve 10 is formed by installing a needle valve core in an orifice of the isolation table 15 through threads, can flow in two directions, and can adjust the flow through the throttle valve 10 by adjusting the relative positions of the needle valve core and the orifice, so as to change the damping force of oil liquid on the rotor 7.
Working principle:
The valve clack closing process comprises the following steps: under the action of a reverse medium, the valve clack 2 drives the rotating shaft 5 to rotate clockwise, the rotating shaft 5 drives the rotor 7 to rotate clockwise, oil cavities at two sides of the rotor 7 are directly communicated through oil grooves in the inner planes of the top cover 8 and the bottom cover 4 in the first 75% stage of the full closing stroke, the damping effect of an oil way is small, and the valve clack 2 is closed rapidly; when the valve clack 2 is closed to about 75%, the rotor 7 seals the oil grooves on the top cover 8 and the bottom cover 4, and at this time, the oil in the front oil cavity in the rotation direction of the rotor 7 can only flow to the oil groove on the plane of the bottom cover 4 through the throttle valve 10 on the stator 6 to enter the rear oil cavity, so that the damping effect is great, and slow closing in the rear 15% of the stroke is realized. By adjusting the opening of the throttle valve 10, an adjustment control of the closing speed of the valve flap 2 can be achieved.
The valve clack opening process: under the action of a forward medium, the valve clack 2 drives the rotating shaft 5 to rotate anticlockwise, the rotating shaft 5 drives the rotor 7 to rotate anticlockwise, in the first 15% stage of the full stroke of opening, hydraulic oil in a front oil cavity in the rotating direction of the rotor 7 flows from an oil groove of the bottom cover 4 to an arc-shaped groove 13 of the top cover 8 through the one-way valve 9 and the throttle valve 10 to enter a rear oil cavity, the one-way valve 9 and the throttle valve 10 are simultaneously opened, the damping effect of an oil way is small, and the opening speed of the valve clack 2 is high; in the later 75% stage of opening, oil cavities at two sides of the rotor 7 are directly communicated through oil grooves on the inner planes of the top cover 8 and the bottom cover 4, the damping effect of an oil way is very small, the valve clack 2 is opened at a normal speed, and the opening time requirement of an opening and closing piece is met.
Claims (3)
1. A special limit check valve comprises a valve body (1), a valve cover (3), a valve clack (2) and a slow-closing device, wherein the valve clack (2) adopts a swing structure, and a rotating shaft (5) of the valve clack (2) penetrates out of the valve body (1) to be connected with the slow-closing device; the method is characterized in that: the slow closing device is formed by installing a rotor (7) in an oil cylinder; the oil cylinder consists of a stator (6), a top cover (8) and a bottom cover (4), wherein the stator (6) is of a cylindrical structure, two symmetrical fan-shaped inner cavities are arranged in the stator, the top cover (8) and the bottom cover (4) are arranged at two ends of the stator (6) in a sealing manner, the fan-shaped inner cavities form a closed oil cavity, and the other end of the bottom cover (4) is fixedly arranged on the valve body (1); the rotor (7) is arranged in a fan-shaped inner cavity of the stator (6), a shaft hole (14) of the rotor is fixedly connected with the rotating shaft (5), symmetrical fan-shaped blades are arranged on two sides of the shaft hole (14), the outer circular arcs of the fan-shaped blades are in dynamic sealing fit with the inner wall of the fan-shaped inner cavity of the stator (6), and two end surfaces of the rotor (7) are respectively in dynamic sealing contact with the inner planes of the bottom cover (4) and the top cover (8); two symmetrical isolation tables (15) are arranged between two fan-shaped inner cavities of the stator (6), the isolation tables (15) are provided with inner arcs which are in dynamic sealing fit with the outer arcs of shaft holes (14) of the rotor (7), a group of parallel check valves (9) and throttle valves (10) are respectively arranged in the isolation tables (15), inlets of the check valves (9) and the throttle valves (10) are communicated with an oil cavity on one side of the rotor (7) in the clockwise direction, and outlets of the check valves and the throttle valves (10) are communicated with an oil cavity on one side of the rotor (7) in the anticlockwise direction; the inner planes of the top cover (8) and the bottom cover (4) are respectively provided with an oil groove, and the radian and the position of the oil groove are 75% of the stroke position of the rotor rotating clockwise.
2. The special limit check valve of claim 1, wherein: the inlets of the one-way valve (9) and the throttle valve (10) are communicated with an oil cavity on one side of the rotor (7) in the clockwise direction through an arc-shaped groove (13) on the inner plane of the top cover (8), and the outlets are communicated with an oil groove on the inner plane of the bottom cover (4) through an isolation table (15).
3. The special limit check valve according to claim 1 or 2, characterized in that: the one-way valve (9) consists of a steel ball and a spring, and is arranged in a valve cavity of the isolation table (15), the steel ball is arranged on an inner step of the valve cavity, and the spring is arranged between the steel ball and an inner plane of the top cover (8); the throttle valve (10) is formed by installing a needle valve core in an orifice of the isolation table (15) through threads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322231304.6U CN220956840U (en) | 2023-08-18 | 2023-08-18 | Special limit check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322231304.6U CN220956840U (en) | 2023-08-18 | 2023-08-18 | Special limit check valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220956840U true CN220956840U (en) | 2024-05-14 |
Family
ID=91017080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322231304.6U Active CN220956840U (en) | 2023-08-18 | 2023-08-18 | Special limit check valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220956840U (en) |
-
2023
- 2023-08-18 CN CN202322231304.6U patent/CN220956840U/en active Active
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