CN211693654U

CN211693654U - Slow-opening and slow-closing check valve

Info

Publication number: CN211693654U
Application number: CN201922002374.8U
Authority: CN
Inventors: 张梅华; 马志祥
Original assignee: WUHAN DAYU VALVE CO Ltd
Current assignee: WUHAN DAYU VALVE CO Ltd
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2020-10-16
Anticipated expiration: 2029-11-19

Abstract

The utility model relates to a valve structure technical field specifically indicates a slow-opening slow-closing check valve. Comprises a valve body, a valve clack, a valve rod and a valve cover; the valve cover and the valve body form a hollow cavity; a diaphragm is arranged in the hollow cavity chamber; a variable-volume control chamber is formed between the diaphragm and the valve cover; one end of the valve rod extends into the control chamber and is fixedly connected with the diaphragm through the diaphragm clamping plate, and the other end of the valve rod extends into the valve body and is fixedly connected with the valve clack; the valve body is internally provided with a valve seat corresponding to the valve clack and realizes the opening or closing between the valve body inlet and the valve body outlet through the matching with the valve clack, and a first control pipeline for controlling the control chamber to slowly discharge to the valve body outlet when the valve body is opened and a second control pipeline for controlling the valve body outlet to slowly inject water to the control chamber when the valve body is closed are arranged between the control chamber and the valve body outlet. The utility model discloses simple structure no matter be to slowly opening or slowly close all have fabulous control effect, the mode of operation is also very convenient, can adapt to the requirement of various differences.

Description

Slow-opening and slow-closing check valve

Technical Field

The utility model relates to a valve structure technical field specifically indicates a slow-opening slow-closing check valve.

Background

The check valve (also called check valve) is a valve which automatically opens and closes a valve flap by the flow of a medium to prevent the medium from flowing backwards, and is also called a check valve, a one-way valve, a reverse flow valve and a back pressure valve. The structure of current check valve is introduced as the chinese utility model patent of the name "a novel slowly-closed check valve" of patent number "201420340866.2", this valve is by the main valve, one-way check valve, needle type governing valve and ball valve are constituteed, the main valve is including the valve body, the valve clack, valve rod and valve gap, valve rod one end is connected with the valve clack, valve clack upper end and valve gap lower part space are the main valve control room, the valve clack upper end is provided with the diaphragm, it is provided with one-way check valve and needle type governing valve to be connected between valve body import and main valve control room, it is provided with the ball valve to be connected between valve body export and main valve control room. The check valve achieves the aim of slow closing by controlling the water pressure in the control chamber of the main valve. However, the pipeline of the valve structure is complex, and the valve structure relates to a pipeline communication structure of the main valve inlet, the main valve control chamber and the main valve outlet, and the control of slow opening is not good in the actual operation process. And there is certain defect to slowly opening slowly closing at present usually, for example when some valve structures are to slowly closing the operation, close the valve to more than 90% fast earlier, then slowly close, this kind of operation process can cause valve structure's damage, also can't avoid closing the in-process and produce the water hammer.

Disclosure of Invention

The utility model aims at solving the defects of the prior art and providing a slow-opening slow-closing check valve.

The technical scheme of the utility model is that: a slowly-opening and slowly-closing check valve comprises a valve body, a valve clack, a valve rod and a valve cover; the valve cover is fixed on the outer side of the valve body and forms a hollow cavity with the valve body; a diaphragm is arranged in the hollow cavity; a variable-volume control chamber is formed between the diaphragm and the valve cover; one end of the valve rod extends into the control chamber and is fixedly connected with the diaphragm through the diaphragm clamping plate, and the other end of the valve rod extends into the valve body and is fixedly connected with the valve clack; a valve seat corresponding to the valve clack is arranged in the valve body and is matched with the valve clack to open or close the inlet and the outlet of the valve body,

the method is characterized in that: and a first control pipeline for controlling the control chamber to slowly discharge to the valve body outlet when the valve body is opened and a second control pipeline for controlling the valve body outlet to slowly inject water to the control chamber when the valve body is closed are arranged between the control chamber and the valve body outlet.

The first control pipeline further comprises a first pipeline which communicates the control chamber with the outlet of the valve body; the first pipeline is provided with a first one-way valve which limits water flow from the valve body outlet to the control chamber but does not limit water flow from the control chamber to the valve body outlet.

And a first throttling valve is arranged on a first pipeline between the first check valve and the control chamber.

The second control pipeline further comprises a second pipeline which is communicated with the control chamber and the outlet of the valve body; and the second pipeline is provided with a second one-way valve which limits the water flow from the control chamber to the valve body outlet but does not limit the water flow from the valve body outlet to the control chamber.

And a second throttling valve is further arranged on a second pipeline between the second one-way valve and the control chamber.

Furthermore, the first pipeline and the second pipeline are in a parallel pipeline structure, an inlet of the second pipeline is communicated with the first pipeline between the first one-way valve and the outlet of the valve body, and an outlet of the second pipeline is communicated with the first pipeline between the first throttling valve and the control chamber.

A spring is further arranged on the valve rod between the diaphragm clamping plate and the valve cover; the spring is sleeved on the valve rod, one end of the spring is abutted against the valve cover, and the other end of the spring is fixedly connected with the diaphragm clamping plate.

The utility model has the advantages that: 1. the utility model discloses a check valve control pipeline structure only involves control room and valve body export, does not have any pipeline connection structure to the valve body import, compares with prior art, the utility model discloses a control pipeline structure is simpler, and no matter slowly open or slowly close, the utility model discloses all have one set of independent pipeline structure to control, the control mode is more simple independent, and control effect is better, can not appear damaging the phenomenon of valve body structure;

2. the utility model discloses the pipeline structure of control slow-opening is very simple, through setting up the first check valve on the first pipeline between control room and valve body export, after the valve body was opened, rivers in the control room were controlled and flow to the valve body export slowly, realized the slow opening of valve clack, and the control process is simple, and pipeline structure is also simple, and control effect is good;

3. the utility model controls the flow rate of water flow in the first pipeline structure by arranging the first throttle valve on the first pipeline structure, and can control the opening speed of the valve clack by adjusting the first throttle valve, thereby being suitable for the valve opening speed requirements of various different requirements;

4. the utility model discloses the pipeline structure of control slow-closure is very simple, through setting up the second check valve on the second pipeline between control room and valve body export, after the valve body was closed, control valve body export water injection slowly in to the control room, realizes slowly closing of valve clack, and the control process is simple, and pipeline structure is also simple, and control effect is good;

5. the second throttle valve is arranged on the second pipeline structure to control the flow velocity of water flow in the second pipeline structure, and the closing speed of the valve clack can be controlled by adjusting the second throttle valve, so that the valve closing speed requirements of various different requirements are met;

6. the utility model discloses a first pipeline is parallelly connected pipeline structure with the second pipeline, and the arrangement is simple, need not to set up too much through-hole structure on the valve gap.

The utility model discloses simple structure no matter be to slowly opening or slowly close all have fabulous control effect, and the pipeline structure of arranging is very simple, and operation mode is also very convenient, can adapt to the requirement of various differences, has very big spreading value.

Drawings

FIG. 1: the structure schematic diagram of the valve body of the utility model when closed;

FIG. 2: the structure schematic diagram of the valve body when opening;

wherein: 1-a valve body; 2-valve clack; 3-a valve stem; 4, valve cover; 5, a membrane; 6-control room; 7-diaphragm clamping plate; 8, valve seats; 9-inlet of valve body; 10-valve body outlet; 11 — a first conduit; 12-a first one-way valve; 13-a first throttle valve; 14 — a second conduit; 15-a second one-way valve; 16-a second throttle valve; 17-a spring.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and specific embodiments.

If fig. 1 ~ 2, the check valve of this embodiment includes valve body 1, valve clack 2, valve rod 3 and valve gap 4, valve gap 4 is fixed and is formed well plenum chamber in the 1 outside of valve body and valve body 1, install an elastic diaphragm 5 in the well plenum chamber, form a changeable control chamber 6 of volume between diaphragm 5 and the

valve gap

4, 3 one end of valve rod stretches into in the control chamber 6 and links firmly with diaphragm 5 through diaphragm splint 7, the other end stretches into and links firmly with valve clack 2 in the valve body 1, be located and be provided with spring 17 on the valve rod 3 between diaphragm splint 7 and the valve gap 4, spring 17 cup joints on valve rod 3, tight valve gap 4 is supported to one end, the other end links firmly in diaphragm splint 7. Be equipped with the disk seat 8 that corresponds with valve clack 2 in the valve body 1, valve clack 2 is along the axial displacement of valve rod 3 under the control of valve rod 3, and valve clack 2 laminating is on disk seat 8, and valve body 1 closes promptly, and valve clack 2 is kept away from disk seat 8, and valve body 1 opens promptly. The valve body 1 is provided with a valve body inlet 9 and a valve body outlet 10, and the valve clack 2 is positioned between the valve body inlet 9 and the valve body outlet 10.

As shown in fig. 1-2, in the present embodiment, a control pipeline is disposed between the control chamber 6 and the valve outlet 10, and includes a first control pipeline for controlling the control chamber 6 to slowly discharge to the valve outlet 10 when the valve body 1 is opened, and a second control pipeline for controlling the valve outlet 10 to slowly inject water to the control chamber 6 when the valve body 1 is closed.

The first control conduit comprises a first conduit 11 communicating the control chamber 6 with the valve body outlet 10, the first conduit 11 being provided with a first one-way valve 12 which restricts water flow from the valve body outlet 10 to the control chamber 6, but does not restrict water flow from the control chamber 6 to the valve body outlet 10. A first throttle 13 is arranged in the first conduit 11 between the first non return valve 12 and the control chamber 6.

When the water pump is started, high-pressure water flow enters the valve body 1 from the valve body inlet 9 to push the valve clack 2 to move upwards, and the valve tends to be opened. As shown in fig. 1, the valve cannot be directly fully opened because the control chamber 6 (the control chamber 6 is full of water after the last operation of the pump is stopped) is full of water. The high pressure water pushes the valve clack 2, the valve rod 3, the diaphragm 5 and other parts to move upwards, and water in the control chamber 6 is discharged gradually. At the moment, water in the control chamber 6 can only be discharged to the valve body outlet 10 through the first pipeline 11 where the first one-way valve 12 is located, the discharge speed is limited by factors such as the pipe diameters of the first one-way valve 12 and the first pipeline 11, and in order to discharge slowly at a constant speed, the pressure of the control chamber 6 is gradually reduced, and the valve clack 2 gradually rises, so that the aim of slowly opening is fulfilled. By controlling the opening of the first throttle valve 13, the rate of water discharge from the control chamber 6, and hence the rate of valve opening, is controlled.

As shown in fig. 1 to 2, the second control duct includes a second duct 14 communicating the control chamber 6 and the valve body outlet 10, and the second duct 14 is provided with a second check valve 15 that restricts water flow from the control chamber 6 to the valve body outlet 10, but does not restrict water flow from the valve body outlet 10 to the control chamber 6. A second throttle valve 16 is arranged in a second conduit 14 between the second non return valve 15 and the control chamber 6.

After the water pump stops, water flow can flow backwards quickly, high-pressure water flow enters the valve body 1 from the valve body outlet 10, and at the moment, the pressure of the control chamber 6 is equal to the pressure of the valve body outlet 10 due to the fact that the control chamber 6 is communicated with the valve body outlet 10. The overall water pressure to which the valve flap 2, the valve stem 3 and the diaphragm 5 are subjected is therefore balanced in all directions, i.e. not affected by the water pressure. However, when the valve is in the fully open position, as shown in figure 2, the flap 2 tends to move downwards due to the urging and gravity of the spring 17, but does not move directly downwards (the urging and gravity of the spring 17 are both small and do not cause a vacuum in the control chamber 6). The rate at which the valve closes at this time is therefore dependent on the rate of water inlet to the valve control chamber 6. Water at the valve body outlet 10 can only enter the control chamber 6 through the second pipeline 14 where the second one-way valve 15 is located, the water flow entering speed is constant and slow, the pressure in the control chamber 6 gradually increases, the valve clack 2 is pushed to slowly descend, and the valve body 1 is slowly closed. By controlling the opening of the second throttle valve 16, the rate at which water from the valve body outlet 10 enters the control chamber 6 is controlled, thereby controlling the rate at which the valve closes.

In the embodiment, in order to simplify the pipeline structure, the first pipeline 11 and the second pipeline 14 are designed to be in a parallel pipeline structure, as shown in fig. 1-2, an inlet of the second pipeline 14 is communicated with the first pipeline 11 between the first check valve 12 and the valve body outlet 10, and an outlet of the second pipeline 14 is communicated with the first pipeline 11 between the first throttle valve 13 and the control chamber 6.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A slow-opening slow-closing check valve comprises a valve body (1), a valve clack (2), a valve rod (3) and a valve cover (4); the valve cover (4) is fixed on the outer side of the valve body (1) and forms a hollow cavity with the valve body (1); a diaphragm (5) is arranged in the hollow cavity chamber; a control chamber (6) with variable volume is formed between the diaphragm (5) and the valve cover (4); one end of the valve rod (3) extends into the control chamber (6) and is fixedly connected with the diaphragm (5) through the diaphragm clamping plate (7), and the other end of the valve rod extends into the valve body (1) and is fixedly connected with the valve clack (2); a valve seat (8) corresponding to the valve clack (2) is arranged in the valve body (1) and is matched with the valve clack (2) to realize the opening or closing between the valve body inlet (9) and the valve body outlet (10),

the method is characterized in that: and a first control pipeline for controlling the control chamber (6) to slowly discharge to the valve body outlet (10) when the valve body (1) is opened and a second control pipeline for controlling the valve body outlet (10) to slowly inject water to the control chamber (6) when the valve body (1) is closed are arranged between the control chamber (6) and the valve body outlet (10).

2. A slow opening slow closing check valve as claimed in claim 1, wherein: the first control pipeline comprises a first pipeline (11) for communicating the control chamber (6) with the valve body outlet (10); the first pipeline (11) is provided with a first one-way valve (12) which limits water flow from the valve body outlet (10) to the control chamber (6) but does not limit water flow from the control chamber (6) to the valve body outlet (10).

3. A slow opening slow closing check valve as claimed in claim 2, wherein: a first throttling valve (13) is arranged on a first pipeline (11) between the first check valve (12) and the control chamber (6).

4. A slow opening slow closing check valve as claimed in claim 2 or 3, wherein: the second control pipeline comprises a second pipeline (14) for communicating the control chamber (6) with the valve body outlet (10); and a second one-way valve (15) which limits water flow from the control chamber (6) to the valve body outlet (10) but does not limit water flow from the valve body outlet (10) to the control chamber (6) is arranged on the second pipeline (14).

5. A slow opening slow closing check valve as defined in claim 4, wherein: and a second throttling valve (16) is arranged on a second pipeline (14) between the second one-way valve (15) and the control chamber (6).

6. A slow opening slow closing check valve as defined in claim 4, wherein: the first pipeline (11) and the second pipeline (14) are in parallel pipeline structures, an inlet of the second pipeline (14) is communicated with the first pipeline (11) between the first one-way valve (12) and the valve body outlet (10), and an outlet of the second pipeline (14) is communicated with the first pipeline (11) between the first throttling valve (13) and the control chamber (6).

7. A slow opening slow closing check valve as claimed in claim 1, wherein: a spring (17) is arranged on the valve rod (3) between the diaphragm clamping plate (7) and the valve cover (4); the spring (17) is sleeved on the valve rod (3), one end of the spring is abutted against the valve cover (4), and the other end of the spring is fixedly connected with the diaphragm clamping plate (7).