CN114458785A

CN114458785A - Gate valve

Info

Publication number: CN114458785A
Application number: CN202210244222.2A
Authority: CN
Inventors: 何维杰; 王琳倩
Original assignee: Hangzhou Xinzhuo Science & Technology Co ltd
Current assignee: Hangzhou Xinzhuo Science & Technology Co ltd
Priority date: 2022-03-14
Filing date: 2022-03-14
Publication date: 2022-05-10

Abstract

The invention discloses a gate valve, which comprises a valve body, wherein one end of the valve body is provided with a liquid inlet, the other end of the valve body is provided with a liquid outlet, the valve body is provided with a valve plate which can move up and down, the upper end of the valve plate is connected with a valve rod, the valve rod drives the valve plate to move up and down, the valve plate is provided with an inner cavity, one surface of the valve plate, which faces the liquid inlet, is provided with a valve plate hole communicated with the inner cavity, the inner cavity is internally provided with a buffer air bag and a rotating plate, the valve rod is provided with an air storage chamber communicated with the buffer air bag, the buffer air bag is extruded to unidirectionally inflate the air storage chamber when the rotating plate is pressed, the valve body is provided with a liquid outlet cylinder and a pneumatic motor, the air storage chamber is provided with an air inlet pipe, when the air inlet pipe is communicated with the pneumatic motor, the air storage chamber is used for introducing air to the pneumatic motor, a liquid outlet piston is arranged in the liquid outlet cylinder, the liquid outlet piston divides the liquid outlet cylinder into an air cavity and a liquid cavity, and when the air inlet pipe is communicated with the air cavity, the air storage chamber is used for introducing air to the air cavity to drive the liquid outlet piston to compress the liquid cavity. The invention aims to buffer impact energy generated by a water hammer and store energy, and reduce the influence of the water hammer on a valve and a pipeline.

Description

Gate valve

Technical Field

The invention belongs to the field of valves, and particularly relates to a gate valve.

Background

The phenomenon of water hammer or water hammer often appears in the pipeline, and the external factors such as the sudden on-off of valve or the water pump shut down suddenly usually make the velocity of flow of water take place the sudden change, and the inertia of pressure rivers causes the pressure in the pipeline to rise in the twinkling of an eye, and the rivers shock wave is reciprocal can produce very big pipeline pressure to destroy valve and water pump, cause the pipeline to damage. In order to eliminate the water hammer and the irregular water shock wave shock caused by surge which are possibly generated by various fluids in a transmission system, the water hammer eliminator is additionally arranged on the pipeline, so that destructive shock waves can be effectively eliminated under the condition of not stopping the flow of the fluids, and the aim of protection is fulfilled. However, install the water hammer annihilator additional on the pipeline, can increase the space requirement and the construction degree of difficulty that the pipeline laid, investigation water hammer annihilator when also being convenient for overhaul has increased maintenance work volume to the pressure of pipeline fluctuates by a wide margin also makes the case screens easily and rotates the difficulty, and dirt impurity deposits in valve department easily, has improved the maintenance work degree of difficulty.

Disclosure of Invention

The invention provides a gate valve which buffers impact energy generated by a water hammer and stores energy, and reduces the influence of the water hammer on the valve and a pipeline.

In order to achieve the purpose, the invention adopts the following technical scheme:

a gate valve comprises a valve body, wherein one end of the valve body is provided with a liquid inlet, the other end of the valve body is provided with a liquid outlet, the valve body is provided with a valve plate which moves up and down, the upper end of the valve plate is connected with a valve rod, the valve rod drives the valve plate to move up and down, the valve plate is provided with an inner cavity, one surface of the valve plate facing the liquid inlet is provided with a valve plate hole communicated with the inner cavity, the inner cavity is internally provided with a buffering air bag and a rotating plate, the valve rod is provided with an air storage chamber communicated with the buffering air bag, the rotating plate extrudes the buffering air bag to unidirectionally inflate the air storage chamber when being pressed, the valve body is provided with a liquid outlet cylinder and a pneumatic motor, the air storage chamber is provided with an air inlet pipe, when the air inlet pipe is communicated with the pneumatic motor, the air storage chamber admits air to the pneumatic motor, the liquid outlet cylinder is internally provided with a liquid outlet piston, the liquid outlet cylinder is divided into an air cavity and the liquid outlet piston compresses the liquid cavity when the air inlet pipe is communicated with the air cavity, and the bottom of the valve plate is provided with a nozzle communicated with the liquid cavity. When the gate valve is in a closed state, the valve plate cuts off the liquid inlet and the liquid outlet, and when the pressure on one side of the liquid inlet is suddenly increased, the water pressure pushes the rotating plate to extrude the buffering air bag to inflate the air storage chamber, so that the impact of a water hammer on the valve and the pipeline is relieved. When the valve plate is required to be opened and communicated with the liquid inlet and the liquid outlet, the air inlet pipe pneumatic motor is communicated to enable the pneumatic motor to rotate to provide assistance for the valve rod. In addition, in the opening process of the valve plate, the liquid outlet piston presses liquid in the liquid outlet cylinder to the nozzle to form water flow, and the water flow rushes to the joint of the valve plate and the valve body, so that sludge impurities are conveniently washed clean, and the sealing performance of the valve plate and the valve body is effectively ensured.

Preferably, the top of the valve body is provided with a rotating wheel in threaded transmission with the valve rod, the rotating wheel drives the valve rod to move up and down when rotating, the rotating wheel is provided with a push cylinder, an air inlet valve for controlling air inlet of the air cavity is arranged below the push cylinder, and the air inlet pipe is communicated with the air cavity to feed air into the air cavity when the push cylinder moves down to act on the air inlet valve. When the push cylinder moves downwards, the starting air inlet valve is opened, so that the compressed air drives the pneumatic motor to operate, the push cylinder is pressed to move downwards in the rotating process of the rotating wheel, and the starting control of the pneumatic motor is conveniently realized.

Preferably, the pushing cylinder comprises a cylinder body, a cylinder seat in sliding fit with the cylinder body is arranged on the valve rod, a pushing cylinder spring is arranged between the cylinder seat and the cylinder body and pushes the cylinder body to move upwards, an opening of the cylinder body faces downwards, a fixed cylinder cover is arranged on the opening of the cylinder body, and the cylinder cover acts on an air inlet valve to communicate the air inlet pipe with the air cavity when the cylinder body moves downwards. The push cylinder spring is compressed in the process of moving the push cylinder downwards, and when the pressing state of the push cylinder is released, the push cylinder spring drives the push cylinder to move upwards for resetting.

Preferably, the lower end of the cylinder seat is provided with a large gear coaxial with the valve rod, a rotating shaft of the pneumatic motor is provided with a small gear driven by the large gear, the valve body is provided with a seat body for fixing the pneumatic motor, and the pneumatic motor and the large gear are both arranged inside the cylinder body. The cylinder body of the push cylinder surrounds the pneumatic motor and the gear, and the function of dust prevention and protection is achieved.

Preferably, a liquid outlet pipe is arranged between the liquid cavity and the nozzle, the liquid outlet pipe is provided with a normally closed liquid outlet valve, an acting part is arranged on the valve rod, and the acting part triggers the liquid outlet valve to communicate with the liquid outlet pipe when the valve rod moves upwards relative to the valve body. When the valve plate needs to be opened, the valve rod opens the liquid outlet valve in the upward moving process, and automatic water outlet cleaning is realized.

Preferably, the action portion includes the annular along valve rod circumference arrangement, be equipped with the transition conical surface between annular groove bottom and the valve rod outer wall, be equipped with the fore-set that links with the case of play liquid valve on the liquid valve, the outer end of fore-set stretches into in the annular, when the valve rod shifts up the transition conical surface acts on the fore-set and makes the drain valve communicate the drain pipe to the inside removal of drain valve.

Preferably, an air outlet pipe is arranged between the air cavity and the pneumatic motor, the liquid outlet valve is a two-position four-way valve, the other two ports of the liquid outlet valve are connected with the air outlet pipe, and the liquid outlet valve switches the communication state of the air outlet pipe and the liquid outlet pipe.

Preferably, the buffering airbag is in a wedge shape with a large upper part and a small lower part, the inner cavity is provided with a return spring above the buffering airbag, and the return spring acts on one side of the rotating plate pressing the inner cavity to the side provided with the valve plate hole.

The invention has the beneficial effects that: (1) impact generated by the water hammer is buffered, part of energy is recycled, and the service lives of the valve and the pipeline are prolonged; (2) when the valve plate is opened, the valve plate is assisted, and the valve plate and the valve body are washed and decontaminated, so that the sealing performance is ensured.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present invention;

FIG. 2 is a side view of the present invention;

FIG. 3 is a schematic view of the structure of the cushion bladder when the rotating plate is pressed;

FIG. 4 is an enlarged view of a portion of FIG. 2 at A;

FIG. 5 is a schematic illustration of an intake valve in an open state;

fig. 6 is a schematic view of the intake valve in an open state.

In the figure: the pneumatic valve comprises a valve plate 1, a valve plate hole 1a, a nozzle 1b, a return spring 101, a rotating plate 102, an air storage chamber 2, a valve body 3, a liquid outlet 3a, a liquid inlet 3b, a seat body 31, a push cylinder 4, a cylinder body 4a, a cylinder seat 4b, a cylinder cover 4c, a push cylinder spring 41, a rotating wheel 5, a valve rod 6, an annular groove 61, a transition conical surface 61a, a buffer air bag 7, a liquid outlet pipe 8, a pneumatic motor 9, a pinion 10, an air outlet pipe 11, an air inlet pipe 12, an air inlet valve 13, a liquid outlet cylinder 14, a piston spring 141, a liquid outlet piston 142, an air chamber 14a, a liquid chamber 14b, a liquid outlet valve 15, a support pillar 15a and a gearwheel 16.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

In the embodiment shown in fig. 1 and 2, the gate valve comprises a valve body 3, wherein a liquid inlet 3b is formed in one end of the valve body 3, a liquid outlet 3a is formed in the other end of the valve body 3, the valve body 3 is provided with a valve plate 1 which can move up and down, a valve rod 6 is connected to the upper end of the valve plate 1, and the valve rod 6 drives the valve plate 1 to move up and down. When the valve plate 1 moves down to the bottom, the valve plate 1 blocks the liquid inlet 3b and the liquid outlet 3a, and the gate valve is in a closed state at the moment. When the valve plate 1 moves upwards, the liquid inlet 3b is communicated with the liquid outlet 3a, and the gate valve is in an opening state at the moment.

Referring to fig. 3, the valve plate 1 is provided with an inner cavity, one surface of the valve plate 1 facing the liquid inlet 3b is provided with a valve plate hole 1a communicated with the inner cavity, the inner cavity is provided with a buffer airbag 7 and a rotating plate 102, the valve rod 6 is provided with an air storage chamber 2, an air storage channel is arranged between the buffer airbag 7 and the air storage chamber 2, the air storage channel is provided with a one-way valve so that the buffer airbag 7 is communicated with the air storage chamber 2 in one way, and the buffer airbag 7 is extruded to inflate the air storage chamber 2 in one way when the rotating plate 102 is pressed. Buffering gasbag 7 is big-end-up's wedge, and the inner chamber is equipped with reset spring 101 in buffering gasbag 7 top, and reset spring 101 acts on and changes board 102 and press to the one side that the inner chamber was equipped with valve plate hole 1 a. The lower end of the rotating plate 102 is rotatably connected with the bottom of the inner cavity, and when water pressure acts on the rotating plate 102, the upper end of the rotating plate 102 rotates to press the buffer air bag 7, and simultaneously, the rotating plate 102 rotates to compress the return spring 101.

As shown in fig. 2, the valve body 3 is provided with a liquid outlet cylinder 14 and an air motor 9, the air storage chamber 2 is provided with an air inlet pipe 12, and the other end of the air inlet pipe 12 is connected to an air inlet of the air motor 9. The inlet pipe 12 includes a check valve to ensure that the air reservoir 2 is one-way admitted to the air motor 9 when the inlet pipe 12 is in the connected state. As shown in fig. 4, a liquid outlet piston 142 is disposed in the liquid outlet cylinder 14, the liquid outlet piston 142 divides the liquid outlet cylinder 14 into an air chamber 14a and a liquid chamber 14b, a piston spring 141 is disposed in the liquid chamber 14b, and the piston spring 141 pushes the piston spring 141 toward the air chamber 14a, so that the liquid outlet piston 142 is reset. The intake pipe 12 communicates with an air chamber 14a of the liquid outlet cylinder 14. When intake pipe 12 and air chamber 14a communicate, it drives liquid piston 142 compression liquid chamber 14b to deposit air chamber 14a air inlet of air chamber 2, valve plate 1 bottom is equipped with spout 1b with liquid chamber 14b intercommunication, spout 1b direction is down, form the liquid stream when liquid in liquid chamber 14b is crowded spout 1b, the liquid stream dashes to

valve plate

1 and 3 juncture of valve body, juncture sets up the recess in order to guarantee the leakproofness usually so that cooperate with valve plate 1 edge, the mud impurity siltation appears easily here, wash through the liquid stream and be convenient for keep 3 inside cleanness of valve body, the sealed effect of gate valve has also been guaranteed.

As shown in fig. 2 and 4, the top of the valve body 3 is provided with a rotating wheel 5 in threaded transmission with the valve rod 6, the rotating wheel 5 drives the valve rod 6 to move up and down when rotating, and the axial position of the rotating wheel 5 relative to the valve body 3 is kept unchanged. The rotating wheel 5 is provided with a push barrel 4, the push barrel 4 comprises a barrel body 4a and a barrel seat 4b, the barrel seat 4b is arranged on the valve rod 6, the barrel seat 4b is in sliding fit with the barrel body 4a, a push barrel spring 41 is arranged between the barrel seat 4b and the barrel body 4a, when the barrel body 4a is pressed downwards, the barrel body 4a compresses the push barrel spring 41, and when the barrel body 4a is released, the push barrel spring 41 pushes the barrel body 4a to move upwards.

As shown in fig. 4, an air inlet valve 13 is provided below the push cylinder 4, in this embodiment, the air inlet valve 13 is fixedly provided at the top of the liquid outlet cylinder 14, and the air inlet valve 13 is used for controlling air inlet of the air chamber 14 a. The opening of the cylinder 4a faces downwards, a fixed cylinder cover 4c is arranged on the opening of the cylinder 4a, when the cylinder 4a moves downwards, the cylinder cover 4c at the lower end of the cylinder 4a acts on the air inlet valve 13, the air inlet pipe 12 is communicated with the air cavity 14a, air is sucked into the air cavity 14a, and the pressure in the air cavity 14a is increased. The lower end of the cylinder seat 4b is provided with a large gear 16 which is coaxial with the valve rod 6, the large gear 16 and the valve rod 6 are kept relatively fixed, a rotating shaft of the pneumatic motor 9 is provided with a small gear 10 which is driven by the large gear 16, and after the pneumatic motor 9 is started, power is transmitted to the valve rod 6 through the small gear 10 and the large gear 16 in a matching mode. The valve body 3 is provided with a seat body 31 for fixing the pneumatic motor 9, and the pneumatic motor 9 and the gearwheel 16 are both arranged inside the cylinder body 4a, so that the dustproof effect is achieved.

Be equipped with drain pipe 8 between liquid chamber 14b and spout 1b, drain pipe 8 is equipped with normally closed liquid valve 15, be equipped with the effect portion on the valve rod 6, as shown in fig. 4, the effect portion includes annular 61 along 6 circumference arrangements of valve rod, be equipped with transition conical surface 61a between annular 61 bottom and the 6 outer walls of valve rod, be equipped with the fore-set 15a with the case linkage of liquid valve 15 on the liquid valve 15, during annular 61 was stretched into to the outer end of fore-set 15a, when valve rod 6 shifts up relative valve body 3, transition conical surface 61a acted on fore-set 15a and made liquid valve 15 communicate drain pipe 8 to the inside removal of liquid valve 15. An air outlet pipe 11 is arranged between the air cavity 14a and the pneumatic motor 9, the liquid outlet valve 15 is a two-position four-way valve, the other two ports of the liquid outlet valve 15 are connected with the air outlet pipe 11, and the liquid outlet valve 15 switches the communication state of the air outlet pipe 11 and the liquid outlet pipe 8. When the action part does not push the top column 15a, the liquid outlet valve 15 enables the gas outlet pipe 11 to be in a normally open state, and enables the liquid outlet pipe 8 to be in a normally closed state. When the action part pushes the top column 15a, the liquid outlet valve 15 enables the liquid outlet pipe 8 to be in a communicated state, and the gas outlet pipe 11 is in a closed state.

In the actual operation process, as shown in fig. 1 and 3, the valve plate 1 moves downward to cut off the liquid inlet 3b and the liquid outlet 3a of the valve body 3, and the gate valve is in a closed state. When the liquid inlet 3b end pressure of the valve body 3 suddenly rises to be about to generate a water hammer phenomenon, water pressure passes through the valve plate hole 1a to act on the rotating plate 102, the rotating plate 102 is pushed to overcome the reset spring 101, the buffer air bag 7 is compressed, and the pressure instantaneous impact is relieved through the matching of the buffer air bag 7 and the reset spring 101. Since the water hammer phenomenon usually generates the reciprocating oscillation of the water hammer, when the pressure at the liquid inlet 3b end is reduced from the peak value, the rotating plate 102 will be reversely rotated and reset under the action of the reset spring 101, and simultaneously, the buffer air bag 7 is inflated to restore to the original shape. The rotating plate 102 can compress the cushion airbag 7 several times during the reciprocating oscillation. After the cushion airbag 7 is pressed, the air storage chamber 2 is inflated in one direction, and at this time, the air pressure in the air storage chamber 2 is increased because the air inlet pipe 12 is in a normally closed state by the air inlet valve 13. In addition, the air storage chamber 2 can be provided with a pressure release valve, and when the pressure in the air storage chamber 2 reaches a preset value, the pressure release valve is opened to release the pressure, so that the overlarge pressure in the air storage chamber 2 is avoided.

When the valve plate 1 needs to be opened to communicate the liquid inlet 3b and the liquid outlet 3a, the rotating wheel 5 is held by a hand, and meanwhile, the cylinder 4a is pressed, as shown in fig. 5, so that the air inlet valve 13 is opened, the compression hole opener in the air storage chamber 2 flows to the air chamber 14a of the liquid outlet cylinder 14 through the air inlet pipe 12, the air outlet pipe 11 is in a normally open state due to the liquid outlet valve 15, the liquid outlet pipe 8 is in a normally closed state, air flows to the pneumatic motor 9 from the air chamber 14a through the air outlet pipe 11, the pneumatic motor 9 runs to output power, and the power is transmitted to the valve rod 6 through the pinion 10 and the bull gear 16 to serve as auxiliary power. Because there is certain time cycle usually between the switching of valve plate 1, because factor influences such as expend with heat and contract with cold in this period of time, the great problem of resistance appears in the extrusion easily received to valve plate 1 and valve rod 6, can be convenient for easily open valve plate 1 through the helping hand this moment, reduces the maintenance personal operation degree of difficulty.

As shown in fig. 6, in the upward movement process of the valve rod 6, the action part of the valve rod 6 also moves upward synchronously, when the transition conical surface 61a of the action part contacts the top pillar 15a, the liquid outlet valve 15 switches the communication state, so that the liquid outlet pipe 8 is in the communication state, at the same time, the gas outlet pipe 11 is in the closing state, at this time, the gas pressure in the air chamber 14a drives the liquid outlet piston 142 to extrude the liquid chamber 14b, and the liquid in the liquid chamber 14b flows to the nozzle 1b through the liquid outlet pipe 8, and finally rushes to the valve body 3 from the bottom of the valve plate 1. When the air pressure of the air chamber 14a is reduced, the liquid outlet piston 142 is returned by the piston spring 141.

Claims

1. A gate valve comprises a valve body (3), wherein one end of the valve body (3) is provided with a liquid inlet (3 b), the other end of the valve body (3) is provided with a liquid outlet (3 a), the valve body (3) is provided with a valve plate (1) which moves up and down, the upper end of the valve plate (1) is connected with a valve rod (6), the valve rod (6) drives the valve plate (1) to move up and down, the gate valve plate (1) is provided with an inner cavity, one side, facing the liquid inlet (3 b), of the valve plate (1) is provided with a valve plate hole (1 a) communicated with the inner cavity, the inner cavity is internally provided with a buffer air bag (7) and a rotating plate (102), the valve rod (6) is provided with an air storage chamber (2) communicated with the buffer air bag (7), the rotating plate (102) extrudes the buffer air bag (7) to unidirectionally inflate the air storage chamber (2) when being pressed, the valve body (3) is provided with a liquid outlet cylinder (14) and a pneumatic motor (9), deposit air chamber (2) and be equipped with intake pipe (12), when intake pipe (12) and pneumatic motor (9) communicate deposit air chamber (2) to pneumatic motor (9) admit air, be equipped with out liquid piston (142) in going out liquid cylinder (14), it separates into air chamber (14 a) and liquid chamber (14 b) to go out liquid piston (142), when intake pipe (12) and air chamber (14 a) communicate deposit air chamber (2) and air chamber (14 a) admit air and drive out liquid piston (142) compression liquid chamber (14 b) (14 b), valve plate (1) bottom is equipped with spout (1 b) with liquid chamber (14 b) intercommunication.

2. The gate valve according to claim 1, wherein a rotating wheel (5) in threaded transmission with the valve rod (6) is arranged at the top of the valve body (3), the rotating wheel (5) drives the valve rod (6) to move up and down when rotating, a push cylinder (4) is arranged on the rotating wheel (5), an air inlet valve (13) for controlling the air inlet of the air cavity (14 a) is arranged below the push cylinder (4), and the air inlet pipe (12) is communicated with the air cavity (14 a) to feed air into the air cavity (14 a) when the push cylinder (4) moves down to act on the air inlet valve (13).

3. A gate valve according to claim 2, wherein the pushing cylinder (4) comprises a cylinder body (4 a), the valve rod (6) is provided with a cylinder seat (4 b) which is in sliding fit with the cylinder body (4 a), a pushing cylinder spring (41) is arranged between the cylinder seat (4 b) and the cylinder body (4 a), the pushing cylinder spring (41) pushes the cylinder body (4 a) to move upwards, an opening of the cylinder body (4 a) faces downwards, a fixed cylinder cover (4 c) is arranged on the opening of the cylinder body (4 a), and the cylinder cover (4 c) acts on the air inlet valve (13) to communicate the air inlet pipe (12) with the air chamber (14 a) when the cylinder body (4 a) moves downwards.

4. A gate valve according to claim 3, characterized in that the lower end of the cylinder seat (4 b) is provided with a gearwheel (16) coaxial with the valve rod (6), the rotating shaft of the pneumatic motor (9) is provided with a pinion (10) in transmission with the gearwheel (16), the valve body (3) is provided with a seat body (31) for fixing the pneumatic motor (9), and the pneumatic motor (9) and the gearwheel (16) are both arranged inside the cylinder (4 a).

5. A gate valve according to claim 1, characterized in that a drain pipe (8) is arranged between the liquid chamber (14 b) and the spout (1 b), the drain pipe (8) is provided with a normally closed drain valve (15), the valve rod (6) is provided with an action part, and the action part triggers the drain valve (15) to communicate the drain pipe (8) when the valve rod (6) moves upwards relative to the valve body (3).

6. A gate valve according to claim 5, characterized in that the acting part comprises an annular groove (61) arranged along the circumferential direction of the valve rod (6), a transition conical surface (61 a) is arranged between the bottom of the annular groove (61) and the outer wall of the valve rod (6), a top pillar (15 a) linked with a valve core of the liquid outlet valve (15) is arranged on the liquid outlet valve (15), the outer end of the top pillar (15 a) extends into the annular groove (61), and when the valve rod (6) moves upwards, the transition conical surface (61 a) acts on the top pillar (15 a) to move towards the inside of the liquid outlet valve (15) so that the liquid outlet valve (15) communicates with the liquid outlet pipe (8).

7. A gate valve according to claim 5, characterized in that an air outlet pipe (11) is arranged between the air chamber (14 a) and the pneumatic motor (9), the liquid outlet valve (15) is a two-position four-way valve, the other two ports of the liquid outlet valve (15) are connected with the air outlet pipe (11), and the liquid outlet valve (15) switches the communication state of the air outlet pipe (11) and the liquid outlet pipe (8).

8. A gate valve according to claim 1, characterised in that the damping bladder (7) is wedge-shaped with a large upper part and a small lower part, the inner chamber is provided with a return spring (101) above the damping bladder (7), and the return spring (101) acts on the rotating plate (102) to press the side of the inner chamber provided with the valve plate hole (1 a).