CN213332557U

CN213332557U - Swing check valve

Info

Publication number: CN213332557U
Application number: CN202022089830.XU
Authority: CN
Inventors: 李杨; 钱青林; 冯程
Original assignee: Sichuan Keycon Kcon Valve Manufacturing Co ltd
Current assignee: Sichuan Keycon Kcon Valve Manufacturing Co ltd
Priority date: 2020-09-22
Filing date: 2020-09-22
Publication date: 2021-06-01
Anticipated expiration: 2030-09-22

Abstract

The utility model discloses a swing check valve, which comprises a valve body, a valve clack for controlling the valve body to open and close through rotation, at least one buffer device arranged on the valve body and swing arms corresponding to the buffer device one by one, wherein the valve body is rotatably connected with a pin shaft, and the valve clack and the swing arms are fixed on the pin shaft; the buffer device comprises a piston oil cylinder, a piston rod and an oil tank, wherein the piston rod is movably arranged in the piston oil cylinder, and the head of the piston rod extends out of the piston oil cylinder and is rotatably connected with the corresponding spiral arm; the oil tank is fixed on the valve body and is communicated with the piston oil cylinder. The valve clack drives the swing arm to rotate together in the process of closing the valve through rotation, the rotation of the swing arm is limited by the buffer device, the rotation speed of the valve clack is reduced, and the large impact force generated in the process of contacting the valve seat by the valve clack is avoided; the utility model discloses the water hammer phenomenon appears when can effectively avoiding the valve to close, plays the guard action to valve clack and disk seat, can prolong swing check valve's life finally.

Description

Swing check valve

Technical Field

The utility model belongs to the technical field of the check valve technique and specifically relates to a swing check valve with slowly close function.

Background

The check valve is a valve with a circular valve clack and acts by self weight and medium pressure to block the medium from flowing backwards. The swing check valve is opened by pushing the valve clack when the working medium flows through the valve clack, and closed by pushing the valve clack by the self weight of the valve clack and the backflow of the working medium.

Because the bore is less, the reply pressure is lower, current swing check valve mainly uses in the place that the medium flow is less, and swing check valve's theory of operation can be applicable. But at present, the nominal diameter of some pipelines is larger and higher, such as NPS48Class600 swing check valves or larger bore higher pressure Class check valves; if a conventional valve opening and closing design is adopted, the upstream working pump stops working suddenly in the use process of the valve, water flow shock waves are generated due to the inertia of pressure water flow, and the valve and the water pump can be damaged due to the fact that the impact force generated by the water flow shock waves back and forth is too large. Because the valve clack self weight of the swing check valve with high pressure and large caliber is larger, the medium reflux pressure is higher, the valve is very easy to generate the water hammer phenomenon in the closing process, the instant kinetic energy of the valve clack contacting with the valve seat is larger, great impact force is generated, great noise is generated slightly, the valve sealing surface is damaged seriously, and the service life of the valve is directly influenced.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: a swing check valve is provided that can cushion the flap as it rotates to slow the closing speed of the flap.

For solving the technical problem the utility model discloses the technical scheme who adopts is: the swing check valve comprises a valve body, a valve clack, at least one buffer device and swing arms, wherein the valve clack is used for controlling the valve body to open and close through rotation; the buffer device comprises a piston oil cylinder, a piston rod and an oil tank, the piston rod is movably arranged in the piston oil cylinder, and the head of the piston rod extends out of the piston oil cylinder and is rotatably connected with the corresponding spiral arm; the oil tank is fixed on the valve body and is communicated with the piston oil cylinder.

Further, the method comprises the following steps: the piston oil cylinder is composed of an oil cylinder upper cavity and an oil cylinder lower cavity, a first inlet and outlet, a second inlet and outlet and a third inlet and outlet are arranged on the piston oil cylinder and communicated with the oil tank, the first inlet and outlet is arranged at the top of the piston oil cylinder and communicated with the oil cylinder upper cavity, the second inlet and outlet is arranged at the lower part of the piston oil cylinder and communicated with the oil cylinder lower cavity, and the third inlet and outlet is arranged at the bottom of the piston oil cylinder and communicated with the oil cylinder lower cavity.

Further, the method comprises the following steps: the head of the piston rod is hinged with the rotary arm through a hinge, and the bottom of the piston oil cylinder is hinged with the valve body through a hinge.

Further, the method comprises the following steps: the valve flap is characterized by further comprising a rocker arm fixedly connected with the pin shaft, and the rocker arm is fixedly connected with the valve flap.

Further, the method comprises the following steps: and a connecting sleeve is fixed at the end of the rocker arm, sleeved at the middle part of the pin shaft and fixedly connected with the pin shaft through a key groove.

Further, the method comprises the following steps: the quantity of buffer and spiral arm all is two, and two spiral arms are fixed respectively at the both ends of round pin axle, and two buffer set up respectively on the both sides face of valve body and are connected with the spiral arm that corresponds.

Further, the method comprises the following steps: the end heads of the two ends of the pin shaft are hexagonal end heads, the end head of the end, which is not connected with the buffer device, of the spiral arm is provided with a hexagonal bayonet matched with the end head of the pin shaft, and the spiral arm is clamped and fixed with the pin shaft.

The utility model has the advantages that: the utility model discloses through increasing buffer on swing check valve and swing arm cooperation and buffering the valve clack, the valve clack drives the swing arm and rotates together through rotating in the process of closing the valve, the rotation of swing arm receives the restriction of buffer that is connected with it to slow down the slew velocity of valve clack, make the valve clack slowly get into contact with the valve seat, avoid the valve clack to contact with the valve seat in the process of producing great impact force; the utility model discloses the water hammer phenomenon appears when can effectively avoiding the valve to close, plays the guard action to valve clack and disk seat, can prolong swing check valve's life finally.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a top sectional view of the utility model;

labeled as: 100-valve body, 200-spiral arm, 300-pin shaft, 410-piston oil cylinder, 411-oil cylinder upper cavity, 412-oil cylinder lower cavity, 413-first inlet and outlet, 414-second inlet and outlet, 415-third inlet and outlet, 420-piston rod, 430-oil tank and 500-rocker arm.

Detailed Description

In order to facilitate understanding of the present invention, the following description is further provided with reference to the accompanying drawings.

The swing check valve includes a valve body 100 and a valve flap rotatably coupled to the valve body 100, the valve flap sealing an outlet of the valve body 100 by rotating to achieve closing of the valve. Swing check valve increased swing arm 200 and buffer and cooperated the rotation to the valve clack and cushioned to reach the purpose that slows down valve clack slew velocity, avoids the valve clack to strike the disk seat. As shown in fig. 1 and 2, a pin 300 is disposed on the valve body 100, a through hole for the pin 300 to pass through is disposed on the valve body 100, the pin 300 passes through the valve body 100, and the pin 300 and the through hole are in clearance fit to realize the rotational connection between the pin 300 and the valve body 100. The swing arm 200 and the valve clack are fixedly connected with the pin shaft 300, so that the pin shaft 300 can be driven to rotate together when the valve clack is impacted by water flow to rotate, and the swing arm 200 fixed on the pin shaft 300 can be driven to rotate by the rotation of the pin shaft 300; the swing arm 200 is connected with a buffer device, and the buffer device plays a role in buffering the rotation of the swing arm 200, so that the effect of reducing the rotation speed of the valve clack is realized.

The buffering device of the utility model is shown in fig. 1, and comprises a piston cylinder 410, a piston rod 420 and an oil tank 430, wherein the piston rod 420 is movably arranged in the piston cylinder 410, the head of the piston rod 420 extends out of the piston cylinder 410 and is hinged with the swing arm 200 through a hinge, the bottom of the piston cylinder 410 is hinged with the valve body 100 through a hinge, and the rotation is more flexible by adopting the hinge connection; the end of the piston rod 420 located inside the piston cylinder 410 and the outlet of the piston cylinder 410 are provided with sealing rings. The oil tank 430 is fixed to the valve body 100 and communicates with the piston cylinder 410. The connection between the piston cylinder 410 and the oil tank 430 is realized by a conventional oil delivery pipe, three inlets and outlets for liquid to enter and exit are arranged on the piston cylinder 410, the piston cylinder 410 is composed of a cylinder upper cavity 411 and a cylinder lower cavity 412, a first inlet and outlet 413, a second inlet and outlet 414 and a third inlet and outlet 415 which are communicated with the oil tank 430 are arranged on the piston cylinder 410, the first inlet and outlet 413 is arranged at the top of the piston cylinder 410 and is communicated with the cylinder upper cavity 411, the second inlet and outlet 414 is arranged at the lower part of the piston cylinder 410 and is communicated with the cylinder lower cavity 412, and the third inlet and outlet 415 is arranged at the bottom of the piston cylinder 410 and is communicated with the cylinder lower cavity 412; the oil tank 430 is pre-filled with a proper amount of hydraulic oil, and the cylinder lower chamber 412 is also pre-filled with hydraulic oil.

When the swing check valve of the utility model works, when the valve is in an opening state, the valve clack rotates to the highest point, the swing arm 200 is driven by the valve clack to be at the highest point, the piston rod 420 is in an extending state, and the bottom of the piston rod 420 is higher than the height of the second inlet and outlet 414; when the valve needs to be closed, the valve flap rotates under the action of the self weight and the thrust of water flow backflow, the valve flap rotates to drive the pin shaft 300 to rotate, the pin shaft 300 drives the swing arm 200 to rotate, the swing arm 200 rotates to push the connected piston rod 420 towards the piston cylinder 410, the piston rod 420 retracts into the piston cylinder 410, and hydraulic oil in the cylinder lower cavity 412 is pushed into the oil tank 430 through the second inlet and outlet 414 and the third inlet and outlet 415 under the pressure of the piston rod 420; meanwhile, the hydraulic oil in the oil tank 430 flows into the oil cylinder upper chamber 411 through the first inlet/outlet 413, and when the piston rod 420 moves downwards to the position below the second inlet/outlet 414, the hydraulic oil in the oil cylinder lower chamber 412 only enters the oil tank 430 through the third inlet/outlet 415, the circulation path of the hydraulic oil is reduced, the moving speed of the piston rod 420 is reduced, the pin shaft 300 is further prevented from rotating, and the rotating speed of the valve flap is finally reduced. In order to adjust the flow rate of the hydraulic oil, an adjusting needle valve may be disposed at the third inlet and outlet 415 to adjust the flow rate of the hydraulic oil at the third inlet and outlet 415, so as to achieve the purpose of adjusting the rotation speed of the valve flap and achieve a better slow-closing effect.

In the utility model, the valve flap is fixed on the pin shaft 300 through the rocker arm 500, as shown in fig. 2, a connecting sleeve matched with the pin shaft 300 is fixed at one end of the rocker arm 500, and the valve flap is fixedly connected with the other end of the rocker arm 500; the pin shaft 300 penetrates through the connecting sleeve to enable the connecting sleeve to be sleeved in the middle of the pin shaft 300, key grooves are formed in the pin shaft 300 and the connecting sleeve, the connecting sleeve and the pin shaft 300 are fixed through the groove keys clamped in the key grooves, and therefore the connecting sleeve and the pin shaft 300 cannot rotate relatively.

In order to improve the pivoted buffering effect of valve clack, the utility model discloses in adopted two buffer, corresponding spiral arm 200 also adopts two, as shown in fig. 1 and fig. 2, two buffers set up respectively on the both sides face of valve body 100, two spiral arms 200 then fix respectively at the both ends end of round pin axle 300. In order to facilitate the disassembly and assembly of the swing arm 200, the two ends of the pin shaft 300 are set to be hexagonal ends, a hexagonal bayonet matched with the end of the pin shaft 300 is arranged at the end of one end, which is not connected with the buffer device, of the swing arm 200, the bayonet of the swing arm 200 is clamped at the end of the pin shaft 300, so that the swing arm 200 and the pin shaft 300 can be fixedly connected, and the swing arm 200 and the pin shaft 300 cannot rotate relatively.

Claims

1. Swing check valve, including valve body (100) and the valve clack through rotation control valve body (100) switching, its characterized in that: the valve body (100) is rotatably connected with a pin shaft (300), and the valve clack and the swing arm (200) are fixed on the pin shaft (300); the buffer device comprises a piston oil cylinder (410), a piston rod (420) and an oil tank (430), the piston rod (420) is movably arranged in the piston oil cylinder (410), and the head of the piston rod (420) extends out of the piston oil cylinder (410) and is rotatably connected with the corresponding swing arm (200); the oil tank (430) is fixed on the valve body (100) and communicated with the piston oil cylinder (410).

2. The swing check valve of claim 1, wherein: the piston oil cylinder (410) is composed of an oil cylinder upper cavity (411) and an oil cylinder lower cavity (412), a first inlet and outlet (413), a second inlet and outlet (414) and a third inlet and outlet (415) which are communicated with the oil tank (430) are arranged on the piston oil cylinder (410), the first inlet and outlet (413) is arranged at the top of the piston oil cylinder (410) and is communicated with the oil cylinder upper cavity (411), the second inlet and outlet (414) is arranged at the lower part of the piston oil cylinder (410) and is communicated with the oil cylinder lower cavity (412), and the third inlet and outlet (415) is arranged at the bottom of the piston oil cylinder (410) and is communicated with the oil cylinder lower cavity (412).

3. The swing check valve of claim 1, wherein: the head of the piston rod (420) is hinged with the swing arm (200) through a hinge, and the bottom of the piston oil cylinder (410) is hinged with the valve body (100) through a hinge.

4. The swing check valve of claim 1, wherein: the valve further comprises a rocker arm (500) fixedly connected with the pin shaft (300), and the rocker arm (500) is fixedly connected with the valve clack.

5. The swing check valve of claim 4, wherein: the end of the rocker arm (500) is fixed with a connecting sleeve, and the connecting sleeve is sleeved in the middle of the pin shaft (300) and is fixedly connected with the pin shaft (300) through a key slot.

6. The swing check valve of claim 1, wherein: the number of the buffer devices and the number of the swing arms (200) are two, the two swing arms (200) are respectively fixed at two ends of the pin shaft (300), and the two buffer devices are respectively arranged on two side surfaces of the valve body (100) and are connected with the corresponding swing arms (200).

7. The swing check valve of claim 6, wherein: the end heads of the two ends of the pin shaft (300) are hexagonal end heads, the end head of the end, which is not connected with the buffer device, of the spiral arm (200) is provided with a hexagonal bayonet matched with the end head of the pin shaft (300), and the spiral arm (200) is connected with the pin shaft (300) in a clamping mode.