CN214367979U - Multi-section damping slow-closing butterfly check valve - Google Patents

Abstract

The utility model relates to a multistage damping slowly closes butterfly check valve, including valve body, valve clack, disk seat, valve shaft, the disk seat slope sets up in the valve body passageway, and the valve clack adopts butterfly structure and disk seat to mutually support to form sealed vice, valve clack central line top back and valve shaft fixed connection, and valve shaft dynamic seal installs in the valve body axial hole, and weight formula energy storage ware and buffer are connected to the one end of valve shaft, and the valve body inner chamber is equipped with built-in damping device. At the initial stage of closing, external buffer cylinder controls the closing speed of the valve clack, and at the later stage of closing, the damping baffle plate on the back of the valve clack is in contact with the damping rod of the internal damping device, and the external buffer cylinder and the internal damping device control the closing speed of the valve clack together, so that the valve clack is in collision-free closing contact with the valve seat, and the effects of silencing and eliminating water hammer are good.

Description

Multi-section damping slow-closing butterfly check valve

Technical Field

The utility model relates to a check valve, especially a butterfly slow-closing check valve. The utility model is suitable for a valve that water pump, hydraulic turbine export prevented the medium adverse current.

Background

And check valves are required to be installed at outlets of water pumps and water turbines of industrial water supply, sewage treatment plants and hydropower stations to prevent media from flowing backwards, so that the safety of equipment is protected. In order to damage pipe networks and equipment by water hammer generated when the check valve is closed, a slow-closing check valve is generally adopted to eliminate the water hammer. According to the novel slowly-closed butterfly check valve with the patent number of CN201120226953.1, including valve body, crank, buffering hydraulic cylinder, valve shaft and piston rod, rely on buffering hydraulic cylinder's effect when closing, make the butterfly plate close the back end and descend closing speed, reduce the water hammer. The main disadvantages are: the closing speed control depends on the control of the buffer hydraulic oil cylinder, and the buffer hydraulic oil cylinder is difficult to be accurately adjusted to reach the optimal closing speed so as to realize the optimal silencing and water reducing hammer effect, and the control performance of the silencing and water reducing hammer is poor.

Disclosure of Invention

The utility model discloses shortcoming to prior art exists provides one kind and adopts the multistage damping to slowly close, and the effectual multistage damping of amortization, elimination water hammer slowly closes butterfly check valve.

The technical scheme of the utility model comprises a valve body, a valve clack, a valve seat and a valve shaft, wherein the valve seat is obliquely arranged in a valve body channel, the valve clack adopts a butterfly structure to be matched with the valve seat to form a sealing pair, the back surface above the central line of the valve clack is fixedly connected with the valve shaft, the valve shaft is movably and hermetically arranged in a valve body axial hole, and one end of the valve shaft is connected with a heavy hammer type energy accumulator and a buffer device; the weight type energy accumulator consists of a weight and a crank, wherein the weight is fixedly arranged at one end of the crank, and the other end of the crank is fixedly connected with the valve shaft; the damping device adopts a damping oil cylinder, the damping oil cylinder is composed of a cylinder body, a piston and a piston rod, the cylinder body is arranged on the outer wall of the valve body, the inner cavity of the cylinder body is filled with grease, the upper end of the piston rod is hinged with the position of the crank close to the valve shaft, the lower end of the piston rod is fixedly connected with the upper end surface of the piston, the outer circular surface of the piston is in clearance fit with the wall of the inner cavity of the cylinder body, and the rod cavity and the rodless cavity of the cylinder body are communicated with each other through a connecting pipeline; the method is characterized in that: the lower part of the valve body channel is provided with a built-in damping device, the built-in damping device consists of a damping cylinder body and a damping rod, the damping cylinder body and the valve body are integrally cast and formed, the inner cavity of the damping cylinder body is communicated with the outlet side of the valve seat, the outer circular surface of the damping rod is in dynamic sealing fit with the wall of the inner cavity of the damping cylinder body, a spring is arranged between one end of the damping rod and the bottom surface of the inner cavity of the damping cylinder body, the other end of the damping rod extends into the valve body outlet channel, and the back of the valve clack is provided with a damping baffle plate which is matched with the damping rod; the bottom surface of the inner cavity of the damping cylinder body is communicated with the inlet channel of the valve body through a communicating pipe.

In the technical scheme, a needle valve is arranged on a communicating pipe between the inner cavity of the damping cylinder body and the inlet channel of the valve body.

In the technical scheme, the bottom surface of the inner cavity of the damping cylinder body is provided with the damping cylinder cover, and a limiting convex shoulder which is matched with the outer circular surface of the damping rod and the outlet end of the inner cavity of the damping cylinder body is arranged between the outer circular surface of the damping rod and the outlet end of the inner cavity of the damping cylinder body.

Compared with the prior art, the utility model beneficial effect be: the valve clack is equipped with external buffer cylinder and built-in damping device, and at the initial stage of closing, external buffer cylinder control valve clack closing speed, and at the later stage of closing, the damping baffle at the valve clack back contacts with the damping rod, and external buffer cylinder and built-in damping device control valve clack closing speed jointly, realize that valve clack and disk seat do not have the collision and close the contact, and its amortization is effectual with eliminating the water hammer.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of the structure of the present invention showing the built-in damping device and the valve flap in fig. 1.

Fig. 3 is a schematic structural view of the cushion cylinder in fig. 1 according to the present invention.

The damping cylinder comprises a damping cylinder cover 1, a damping cylinder body 2, a needle valve 3, a buffer oil cylinder 4, a valve body 5, a valve shaft 6, a heavy hammer 7, a crank 8, a communicating pipe 9, a valve clack 10, a valve seat 11, a damping baffle 12, a damping rod 13, a spring 14, a cylinder body 4.1, a piston 4.2, a piston rod 4.3 and a connecting pipeline 4.4.

Detailed Description

The multi-section damping slow-closing butterfly check valve shown in fig. 1 comprises a valve body 5, a valve clack 10, a valve seat 11 and a valve shaft 6, wherein the valve seat 11 is obliquely arranged in a channel of the valve body 5, so that the center line of a flow channel of the valve seat 11 and the center line of the channel of the valve body 11 form an included angle, the valve clack is convenient to open, the valve clack 10 adopts a butterfly structure to be matched with the valve seat 11 to form a sealing pair, the back surface above the center line of the valve clack 10 is fixedly connected with the valve shaft 6, the valve shaft 6 is movably and hermetically arranged in a shaft hole of the valve body 11, the valve clack 10 is rotationally opened in the shaft hole of the valve body 11 by taking the valve shaft 6 as a rotating shaft under the action of forward medium pressure, and when the forward medium pressure disappears, the valve clack 10 is automatically closed by the gravity, and the medium is prevented from flowing backwards to damage pipelines and arrangement; one end of the valve shaft 6 is fixedly connected with one end of a crank 8, a heavy hammer 7 is fixedly installed at the other end of the crank 8, the heavy hammer 7 is driven to lift up to store energy when the valve clack 10 is pushed to be opened by forward medium pressure, when the forward medium pressure disappears, the valve clack 10 is closed by the potential energy of the heavy hammer 7 and the gravity of the valve clack 10 together, the closing speed and the sealing force of the valve clack 10 are improved, and a buffer oil cylinder 4 is arranged at one side, close to the valve shaft 6, in the middle of the crank 8; the buffer oil cylinder 4 consists of a cylinder body 4.1, a piston 4.2 and a piston rod 4.3, the cylinder body 4.1 is installed on the outer wall of the valve body 5, the inner cavity of the cylinder body is filled with grease, the upper end of the piston rod 4.3 is hinged with the crank 8, the piston rod 4.3 rotates along with the hinged point of the crank 8, the lower end of the piston rod 4.3 is fixedly connected with the upper end face of the piston 4.2, the outer circular face of the piston 4.2 is in clearance fit with the inner cavity wall of the cylinder body 4.1, the rod cavity and the rodless cavity of the cylinder body 4.1 are communicated with each other through a connecting pipeline 4.4, when the valve clack 10 is opened, the grease in the inner cavity of the cylinder body 4.1 flows into the rodless cavity, when the valve clack 10 is closed, the grease in the rodless cavity is pressed into the rod cavity through the connecting pipeline 4.4 by the piston 4, as shown in figure 3, and along with the reduction of the opening degree when the valve clack 10 is closed, the pressure of the piston 4.2 on the grease is larger, the slow closing of the valve clack 10, the valve clack 10 is realized; a built-in damping device is arranged at the lower part of a channel of a valve body 5, the built-in damping device is composed of a damping cylinder body 2 and a damping rod 13, the damping cylinder body 2 and the valve body 5 are integrally cast, the inner cavity of the damping cylinder body 2 is communicated with the outlet side of a valve seat 11, the outer circular surface of the damping rod 13 is in dynamic sealing fit with the wall of the inner cavity of the damping cylinder body 2, a spring 14 is arranged between one end of the damping rod 13 and the bottom surface of the inner cavity of the damping cylinder body 2, the other end of the damping rod 13 extends into the outlet channel of the valve body 5, a damping baffle plate 12 matched with the damping rod 13 is arranged on the back surface of the valve flap 10, the damping baffle plate 12 is in top contact with the end part of the damping rod 13 at the later closing stage of the valve flap 10, the damping rod 13 is pressed into the damping cylinder body 2 by the compression spring 14, the valve flap 10 is slowly closed to be in contact with the valve seat 11 by the elastic force of the spring 14, and the sound and the water hammer generated by the mutual collision between the valve flap 10 and the valve seat 11 are eliminated, as shown in figure 2; the bottom surface of the inner cavity of the damping cylinder body 2 is communicated with an inlet channel of the valve body 5 through a communicating pipe 9, a medium of the inlet channel of the valve body 5 is introduced into the damping cylinder body 2, and in the later stage of closing of the valve clack 10, the medium in the damping cylinder body 2 is pressed out to an outlet channel of the valve body 5 through the communicating pipe 9, so that a damping effect is generated on the closing of the valve clack 10, and the functions of noise elimination and water hammer elimination are further improved.

The needle valve 3 is arranged on a communicating pipe 9 between the inner cavity of the damping cylinder body 2 and the inlet channel of the valve body 5, and the damping force is adjusted to achieve the best effects of eliminating noise and water hammer.

The bottom surface of the inner cavity of the damping cylinder body 2 is provided with a damping cylinder cover 1, and a limiting convex shoulder which is matched with the outer circular surface of the damping rod 13 and the outlet end of the inner cavity of the damping cylinder body 2 is arranged between the outer circular surface of the damping rod 13 and the outlet end of the inner cavity of the damping cylinder body 2, so that the damping rod 13 is prevented from being pushed out of the inner cavity of the damping cylinder body 2 by a spring 14 and medium pressure.

Claims (3)

1. A multi-section damping slow-closing butterfly check valve comprises a valve body (5), a valve clack (10), a valve seat (11) and a valve shaft (6), wherein the valve seat (11) is obliquely arranged in a channel of the valve body (5), the valve clack (10) is matched with the valve seat (11) to form a sealing pair by adopting a butterfly structure, the back of the upper part of the central line of the valve clack (10) is fixedly connected with the valve shaft (6), the valve shaft (6) is movably and hermetically arranged in a shaft hole of the valve body (5), and one end of the valve shaft (6) is connected with a heavy hammer type energy accumulator and a buffer device; the weight type energy accumulator consists of a weight (7) and a crank (8), the weight (7) is fixedly arranged at one end of the crank (8), and the other end of the crank (8) is fixedly connected with the valve shaft (6); the damping device adopts a damping oil cylinder (4), the damping oil cylinder (4) is composed of a cylinder body (4.1), a piston (4.2) and a piston rod (4.3), the cylinder body (4.1) is installed on the outer wall of the valve body (5), the inner cavity of the cylinder body is filled with grease, the upper end of the piston rod (4.3) is hinged with a position of a crank (8) close to the valve shaft (6), the lower end of the piston rod (4.1) is fixedly connected with the upper end face of the piston (4.2), the outer circular face of the piston (4.2) is in clearance fit with the inner cavity wall of the cylinder body (4.1), and a rod cavity and a rodless cavity of the cylinder body (4.1) are communicated with each other through a connecting pipeline (4.4); the method is characterized in that: a built-in damping device is arranged at the lower part of a channel of the valve body (5), the built-in damping device is composed of a damping cylinder body (2) and a damping rod (13), the damping cylinder body (2) and the valve body (5) are integrally cast, an inner cavity of the damping cylinder body (2) is communicated with the outlet side of the valve seat (11), the outer circular surface of the damping rod (13) is in dynamic sealing fit with the wall of the inner cavity of the damping cylinder body (2), a spring (14) is arranged between one end of the damping rod (13) and the bottom surface of the inner cavity of the damping cylinder body (2), the other end of the damping rod (13) extends into the outlet channel of the valve body (5), and a damping baffle plate (12) matched with the damping rod (13) is arranged on the back surface of the valve flap (10); the bottom surface of the inner cavity of the damping cylinder body (2) is communicated with an inlet channel of the valve body (5) through a communicating pipe (9).

2. The multi-stage damping slow-closing butterfly check valve of claim 1, wherein: a needle valve (3) is arranged on a communicating pipe (9) between the inner cavity of the damping cylinder body (2) and the inlet channel of the valve body (5).

3. The multi-stage damping slow-closing butterfly check valve of claim 1 or 2, characterized in that: the bottom surface of the inner cavity of the damping cylinder body (2) is provided with a damping cylinder cover (1), and a limiting convex shoulder which is matched with the outer circular surface of the damping rod (13) and the outlet end of the inner cavity of the damping cylinder body (2) is arranged between the outer circular surface of the damping rod and the outlet end of the inner cavity of the damping cylinder body.

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