CN210372060U

CN210372060U - Anti-backflow stop valve

Info

Publication number: CN210372060U
Application number: CN201920880102.5U
Authority: CN
Inventors: 鲍云武; 陈德辉
Original assignee: Zhejiang Yangda Valve Co Ltd
Current assignee: Zhejiang Yangda Valve Co Ltd
Priority date: 2019-06-12
Filing date: 2019-06-12
Publication date: 2020-04-21
Anticipated expiration: 2029-06-12

Abstract

The utility model belongs to the field of stop valves, in particular to a backflow-preventing stop valve, which comprises a valve seat and a valve core fixed on the inner wall of the valve seat, wherein flanges are fixedly connected with two ends of the valve seat, a valve rod is screwed on the valve seat, the top end of the valve rod is fixedly connected with a first hand wheel, a valve port is arranged on the valve core, and the outer wall of the bottom end of the valve rod is fixedly connected with a valve clack for sealing the valve port; the valve rod is rotated, so that the valve clack descends and is sealed with the valve port, the rotating column is rotated clockwise through the second hand wheel, under the action of the sliding groove, the connecting rod pushes the plurality of sealing pressing plates to slide outwards, the diameter of the plurality of sealing pressing plates after sliding out is larger than that of the valve port, if liquid media flows back, the impact force of liquid backflow firstly acts on the fixed disc and the sealing pressing plates, the fixed disc and the sealing pressing plates move upwards under the action of the limiting rod, the sealing pressing plates compress the sealing rings, the impact force of the liquid backflow on the valve clack is effectively reduced, and the liquid backflow is prevented.

Description

Anti-backflow stop valve

Technical Field

The utility model relates to a stop valve field specifically is a stop valve of anti-return.

Background

The stop valve has a plug-shaped valve clack, a sealing surface is a plane or a conical surface, the valve clack makes linear motion along the central line of a valve seat, the motion form of a valve rod also has a lifting rotating rod type, the stop valve refers to a valve with a closing member moving along the central line of the valve seat, and according to the motion form of the valve clack, the change of a valve seat through hole is in a direct proportion relation with the stroke of the valve clack.

The valve clack of current stop valve all directly seals in valve port one side, and when liquid backward flow, the impact force directly acts on the valve clack, and after long-time the use, the valve clack takes place wearing and tearing easily, leads to its leakproofness to reduce, can't effectively seal liquid, takes place liquid backward flow easily, is unfavorable for the use.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a stop valve of anti-return to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

a backflow-preventing stop valve comprises a valve seat and a valve core fixed on the inner wall of the valve seat, wherein flanges are fixedly connected with the two ends of the valve seat, a valve rod is screwed on the valve seat, the top end of the valve rod is fixedly connected with a first hand wheel, a valve port is arranged on the valve core, the outer wall of the bottom end of the valve rod is fixedly connected with a valve clack used for sealing the valve port, the outer edge of the bottom surface of the valve port is fixedly connected with a sealing ring, a rotating column is rotatably connected at the middle position of the valve rod, the bottom end of the rotating column is slidably connected with a rotating disc, the bottom surface of the rotary disc is rotationally connected with a fixed disc, the fixed disc is elastically connected with the bottom surface of the valve rod through a plurality of limiting rods, the top surface of the fixed disk is connected with a plurality of sealing press plates in a sliding mode, the turntable is provided with a plurality of sliding grooves corresponding to the sealing press plates, and the sealing press plates are in transmission connection with the sliding grooves through connecting rods.

As a further aspect of the present invention: the bottom of the rotating column is provided with a slot, the top surface of the rotating disc is fixedly connected with a sliding block, and the sliding block is connected with the slot in a sliding mode.

As a further aspect of the present invention: the limiting rod comprises a fixed rod and a sliding rod sliding on the inner wall of the fixed rod, one end of the inner wall of the fixed rod is fixedly connected with a spring, and the other end of the spring is connected with the sliding rod.

As a further aspect of the present invention: the top surface of the fixed disk is fixedly connected with a plurality of sliding rails corresponding to the sealing pressure plate, the sealing pressure plate is connected with the sliding rails in a sliding manner, and the sliding rails are T-shaped.

As a further aspect of the present invention: the diameter of the fixed disc is smaller than that of the valve port.

As a further aspect of the present invention: the spring is a compression wire spring.

As a further aspect of the present invention: the top end of the rotating column is fixedly connected with a second hand wheel.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the valve rod is rotated, so that the valve clack descends and is sealed with the valve port, the rotating column is rotated clockwise through the second hand wheel, under the action of the sliding groove, the connecting rod pushes the plurality of sealing pressing plates to slide outwards, the diameter of the plurality of sealing pressing plates after sliding out is larger than that of the valve port, if liquid media flows back, the impact force of liquid backflow firstly acts on the fixed disc and the sealing pressing plates, the fixed disc and the sealing pressing plates move upwards under the action of the limiting rod, the sealing pressing plates compress the sealing ring, the impact force of the liquid backflow on the valve clack is effectively reduced, the valve clack is prevented from being damaged, and liquid.

2. The gag lever post includes dead lever and the slide bar of slip at its inner wall, the inner wall one end fixedly connected with spring of dead lever, the other end and the slide bar of spring are connected, the spring is the compression wire spring, when fixed disk and seal clamp plate receive the impact force, because the spring is the compression wire spring, the effort is less, the slide bar can upwards slide, when no impact force, under the effect of spring, fixed disk and seal clamp plate can break away from the sealing washer and reset, when seal clamp plate stretches out or contracts, do not with sealing washer contact friction, the life of improvement sealing washer.

Drawings

FIG. 1 is a schematic view of a backflow prevention shut-off valve;

FIG. 2 is a schematic view showing the internal structure of a backflow prevention shut-off valve;

FIG. 3 is a schematic view of the bottom end of the valve stem in a backflow prevention shut-off valve;

FIG. 4 is a schematic structural diagram of a rotary disk and a sealing pressure plate in the backflow prevention shutoff valve;

fig. 5 is a schematic view of a stop lever of the backflow prevention shutoff valve.

In the figure: 1. a valve seat; 11. a valve core; 111. a valve port; 12. a flange; 13. a valve stem; 14. a first hand wheel; 15. a valve flap; 16. a seal ring; 2. rotating the column; 201. a slot; 21. a turntable; 211. a chute; 22. fixing the disc; 221. a slide rail; 23. a limiting rod; 231. fixing the rod; 232. a slide bar; 233. a spring; 24. sealing the pressure plate; 241. a connecting rod; 25. a slider; 26. a second hand wheel.

Detailed Description

Referring to fig. 1 to 5, in an embodiment of the present invention, a backflow prevention stop valve includes a valve seat 1 and a valve core 11 fixed on an inner wall of the valve seat 1, flanges 12 are fixedly connected to two ends of the valve seat 1, a valve rod 13 is screwed on the valve seat 1, a first hand wheel 14 is fixedly connected to a top end of the valve rod 13, a valve port 111 is formed on the valve core 11, a valve flap 15 for sealing the valve port 111 is fixedly connected to an outer wall of a bottom end of the valve rod 13, a sealing ring 16 is fixedly connected to an outer edge of a bottom surface of the valve port 111, a rotating column 2 is rotatably connected to a middle position of the valve rod 13, a rotating disc 21 is slidably connected to a bottom end of the rotating column 2, a fixed disc 22 is rotatably connected to a bottom surface of the rotating disc 21, the fixed disc 22 is elastically connected to the bottom surface of the valve rod 13 through a plurality, the sealing pressure plate 24 is in transmission connection with the sliding groove 211 through a connecting rod 241.

In fig. 1: both ends fixedly connected with flange 12 of disk seat 1, the spiro union has valve rod 13 on the disk seat 1, the first hand wheel 14 of top fixedly connected with of valve rod 13, flange 12 through the both ends fixed connection of disk seat 1 and pipeline sealing connection to realize closing and opening of stop valve through rotating first hand wheel 14, thereby the circulation and the closing of control pipeline.

In fig. 2: the inner wall of the valve seat 1 is fixedly connected with a valve core 11, two ends of the valve seat 1 are fixedly connected with flanges 12, the valve rod 13 is screwed on the valve seat 1, the top end of the valve rod 13 is fixedly connected with a first hand wheel 14, a valve port 111 is arranged on the valve core 11, the outer wall of the bottom end of the valve rod 13 is fixedly connected with a valve clack 15 used for sealing the valve port 111, the outer edge of the bottom surface of the valve port 111 is fixedly connected with a sealing ring 16, the flange 12 fixedly connected with two ends of the valve seat 1 is connected with a pipeline in a sealing mode, the first hand wheel 14 is rotated to control rising and falling of the valve clack 15, when the valve clack 15 falls and is sealed with the valve port 111, the stop valve is closed, when the valve clack 15 rises and is separated from.

In fig. 3 and 4: the outer wall of the bottom end of the valve rod 13 is fixedly connected with a valve clack 15 for sealing the valve port 111, the outer edge of the bottom surface of the valve port 111 is fixedly connected with a sealing ring 16, the middle position of the valve rod 13 is rotatably connected with a rotating column 2, the bottom end of the rotating column 2 is slidably connected with a rotating disc 21, the bottom surface of the rotating disc 21 is rotatably connected with a fixed disc 22, the fixed disc 22 is elastically connected with the bottom surface of the valve rod 13 through a plurality of limiting rods 23, the top surface of the fixed disc 22 is slidably connected with a plurality of sealing press plates 24, the rotating disc 21 is provided with a plurality of sliding grooves 211 corresponding to the sealing press plates 24, the sealing press plates 24 are in transmission connection with the sliding grooves 211 through connecting rods 241, the bottom end of the rotating column 2 is provided with a slot 201, the top surface of the rotating disc 21 is fixedly connected with a sliding block 25, the sliding rail 221 is "T" shaped, the diameter of the fixed disk 22 is smaller than that of the valve port 111, when in use, the valve rod 13 is rotated by the first hand wheel 14, so that the valve flap 15 descends and seals with the valve port 111, meanwhile, the rotary disk 21 and the fixed disk 22 pass through the valve port 111 and are located below the sealing ring 16, the rotating column 2 is rotated clockwise by the second hand wheel 26, under the action of the chute 211, the connecting rod 241 pushes the plurality of sealing pressing plates 24 to slide outwards, the diameter of the plurality of sealing pressing plates 24 after sliding out is larger than that of the valve port 111, under normal conditions, the valve flap 15 seals the valve port 111 to close the stop valve, if a liquid medium reflows, the impact force of the liquid reflowing first acts on the fixed disk 22 and the sealing pressing plates 24, the fixed disk 22 and the sealing pressing plates 24 move upwards under the action of the limiting rod 23, the sealing pressing ring 16 is compressed by the sealing, preventing the flap 15 from sealing loosely, resulting in backflow of liquid.

In fig. 5: the stopper rod 23 includes a fixing rod 231 and a sliding rod 232 sliding on an inner wall thereof, one end of the inner wall of the fixing rod 231 is fixedly connected with a spring 233, the other end of the spring 233 is connected with the sliding rod 232, the spring 233 is a compressed wire spring, when the fixing disk 22 and the sealing press plate 24 are subjected to an impact force, the spring 233 is a compressed wire spring, the acting force is small, the sliding rod 232 can slide upwards, and when there is no impact force, the fixing disk 22 and the sealing press plate 24 can be reset under the action of the spring 233.

The utility model discloses a theory of operation is: when the check valve is used, the valve rod 13 is rotated by the first hand wheel 14, so that the valve clack 15 descends and seals the valve port 111, meanwhile, the rotary disc 21 and the fixed disc 22 penetrate through the valve port 111 and are positioned below the sealing ring 16, the rotating column 2 is rotated clockwise by the second hand wheel 26, under the action of the sliding groove 211, the connecting rod 241 pushes the plurality of sealing pressing plates 24 to slide outwards, the diameter of the plurality of sealing pressing plates 24 after sliding out is larger than that of the valve port 111, under normal conditions, the valve clack 15 seals the valve port 111 to close the check valve, if liquid media reflows, the impact force of liquid reflowing firstly acts on the fixed disc 22 and the sealing pressing plates 24, the fixed disc 22 and the sealing pressing plates 24 move upwards under the action of the limiting rod 23, the sealing pressing plates 24 compress the sealing ring 16, the impact force of the liquid reflowing on the valve clack 15 is effectively, when the fixed disk 22 and the sealing pressing plates 24 are impacted, the spring 233 is a compressed wire spring, so that the acting force is small, the sliding rod 232 can slide upwards, when no impact force exists, the fixed disk 22 and the sealing pressing plates 24 can reset under the action of the spring 233, when the valve needs to be opened, the rotating column 2 is rotated reversely, the connecting rod 241 pushes the sealing pressing plates 24 to contract inwards under the action of the sliding groove 211, then the valve rod 13 is rotated reversely through the first hand wheel 14, the valve clack 15 rises and is separated from the valve port 111, and the stop valve is opened.

Claims

1. A backflow-preventing stop valve comprises a valve seat (1) and a valve core (11) fixed on the inner wall of the valve seat, wherein flanges (12) are fixedly connected to two ends of the valve seat (1), a valve rod (13) is screwed on the valve seat (1), and a first hand wheel (14) is fixedly connected to the top end of the valve rod (13), the backflow-preventing stop valve is characterized in that a valve port (111) is formed in the valve core (11), a valve clack (15) used for sealing the valve port (111) is fixedly connected to the outer wall of the bottom end of the valve rod (13), a sealing ring (16) is fixedly connected to the outer edge of the bottom surface of the valve port (111), a rotating column (2) is rotatably connected to the middle position of the valve rod (13), a rotating disc (21) is slidably connected to the bottom end of the rotating column (2), a fixing disc (22) is rotatably connected to the bottom surface of the rotating disc (21), and the fixing, the top surface of fixed disk (22) sliding connection has a plurality of sealed clamp plate (24), seted up on carousel (21) a plurality of in sealed clamp plate (24) corresponding spout (211), sealed clamp plate (24) pass through connecting rod (241) with spout (211) transmission is connected.

2. The backflow-preventing stop valve according to claim 1, wherein a slot (201) is formed in the bottom end of the rotating column (2), a sliding block (25) is fixedly connected to the top surface of the rotating disc (21), and the sliding block (25) is slidably connected with the slot (201).

3. The backflow prevention shut-off valve according to claim 1, wherein the limiting rod (23) comprises a fixed rod (231) and a sliding rod (232) sliding on the inner wall of the fixed rod, one end of the inner wall of the fixed rod (231) is fixedly connected with a spring (233), and the other end of the spring (233) is connected with the sliding rod (232).

4. The backflow-preventing stop valve according to claim 1, wherein the top surface of the fixed disk (22) is fixedly connected with a plurality of sliding rails (221) corresponding to the sealing pressure plate (24), the sealing pressure plate (24) is slidably connected with the sliding rails (221), and the sliding rails (221) are T-shaped.

5. A backflow-preventing shut-off valve as claimed in claim 1, wherein the diameter of the fixed disk (22) is smaller than the diameter of the valve port (111).

6. A backflow-preventing shut-off valve according to claim 3, characterised in that said spring (233) is a compression wire spring.

7. A backflow-preventing shut-off valve as claimed in claim 1, characterised in that a second hand wheel (26) is fixedly connected to the top end of the rotary column (2).