CN104006190A - Integral type check valve - Google Patents

Abstract

The invention relates to an integral one-way valve device, comprising: a cylindrical structural body with a blind hole arranged inside, characterized in that it also includes: a cut-off end arranged with a contraction section, a sealing ring and an inner blind hole arranged The bottom surface of the blind hole is located inside the contraction section, and the valve plate and the valve seat divided by the cutout are arranged on the contraction section. During operation, the pressure at the end communicating with the blind hole inside the valve is higher than the pressure outside the valve plate. When, under the action of fluid, the cantilever beam valve plate is deformed, and the cutout is opened to form fluid outflow. The sheet is pressed tightly on the valve seat, the cut is closed and sealed, forming a one-way cut-off. There is no material removal during the formation of the valve cut, so the sealing accuracy between the valve sheet and the valve seat is easy to ensure, and the duckbill valve has simple process and tight sealing. It has the characteristics of good performance and traditional cantilever beam valve with good flow performance and high response speed.

Description

An integral one-way valve

technical field

The invention belongs to the field of fluid drive and control, a miniature one-way valve and equipment using the miniature one-way valve, and in particular relates to an integral one-way valve device.

Background technique

One-way valve is a common fluid control device in fluid drive. Fluid can flow in and out from the inlet port of the valve and flow out from the outlet port, but cannot flow in and out from the inlet port. The transmission check valve can be divided into two types according to its composition: integral check valve and assembled check valve, the integral check valve is formed by one component without assembly process, and the assembled check valve includes Multiple parts need to be assembled to form a one-way flow control capability. The integral check valve has the characteristics of simple structure, convenient processing, low cost and flexible layout. It is widely used in micro-small fluid conveying devices. The typical type is the duckbill valve. There are no other moving parts except the rubber parts themselves. The rubber parts of the one-way valve can realize the fluid control function of the one-way valve. A large number of related patents have appeared for the duckbill valve, and it is used in brake devices, small household appliances, kidney dialysis, hypodermic injection, sports equipment, toys and some types of pumps. It has been used, but due to the limitations of its structure and working principle, the current duckbill valve has a large opening pressure, a large flow resistance, and a small elastic deformation of the valve when the reverse pressure is applied after the valve is closed. These characteristics restrict the duckbill valve. Application of valves in tiny fluid delivery equipment. At the same time, the traditional cantilever beam valve is generally composed of multiple parts. Due to the assembly error, its reverse cut-off performance is poor, and the assembly method of multiple parts restricts its miniaturization and miniaturization. It is used in micro-fluid delivery equipment. are also restricted.

Contents of the invention

In order to solve the problems of high opening pressure and large flow resistance of the duckbill valve in the micro-small fluid conveying equipment, and the pressure deformation and absorption pressure after the valve is closed, the assembly error of the cantilever beam valve leads to low efficiency after miniaturization, and so on. Type check valve device, made of rubber material. The valve plate and the valve seat of the valve are two parts of the whole material, which are not assembled and formed. The process is simple, the sealing is good, and the traditional cantilever beam valve has the characteristics of good flow performance and high response speed.

In order to achieve the above object, the present invention adopts the following technical solutions:

The present invention is an integral one-way valve, which is a cylindrical structure, including a valve plate and a valve seat divided by a cutout, and a sealing ring structure for auxiliary installation, wherein:

One end of the cylindrical structure has a partially contracted cylindrical, conical or curved surface structure, that is, a contraction section. This end is called a cut-off end, and a blind hole is arranged inside it. The distance is less than the length of the contraction section, that is, the interior of the contraction section has a hollow structure, and a slit is cut in the contraction section, and the plane formed by the incision intersects the outer surface of the contraction section and the inner surface of the contraction section, and the cutting direction of the incision If it is not parallel to the center line of the overall cylindrical structure, a cantilever beam will be formed between the cutout and the breakpoint of the contraction section, and the cantilever can move to the outside of the contraction section. When the movement occurs, the cutout of the one-way valve is opened, so The above-mentioned cantilever forms the valve plate part of the valve, and the contact surface corresponding to the valve plate on the other side of the cut forms the valve seat;

The other end of the cylindrical structure is the installation end, which is used to connect with other pipelines. One or more sealing ring structures are arranged on the outer surface of the valve connection end. When the valve is installed on the inside of a pipeline, the outside of the installation end cylinder Form a seal with the inner wall of the pipeline to ensure that the fluid can only flow through the cutout between the valve plate and the valve seat; when the valve is installed on the outside of a pipeline, the inner diameter of the valve should be smaller than the outer diameter of the pipeline, and the diameter difference should not be greater than 10% of the inner diameter of the blind hole of the valve, while ensuring the sealing between the pipeline and the valve, the rubber part structure of the valve is not damaged, and a sealing ring can also be arranged on the outer wall of the matching pipeline to achieve sealing.

When working, the inside, outside or inside and outside of the installation end of the valve are connected to the pipeline at the same time and sealed. The sheet is deformed, and the cutout is opened to form fluid outflow. When the pressure at the end connected to the blind hole inside the valve is lower than the pressure outside the valve sheet, under the action of the fluid, the cantilever beam valve sheet is pressed against the valve seat, and the cutout is closed. Sealing, forming a one-way cut-off, that is, forming a one-way cut-off capability.

Description of drawings

Fig. 1 is a structural schematic diagram of an integral check valve of the present invention.

Fig. 2 is a state where an integral check valve of the present invention is opened under the action of fluid.

Fig. 3 is the closed state of an integral one-way valve of the present invention under the action of fluid.

Detailed ways

Referring to Fig. 1, Fig. 2 and Fig. 3, an integral check valve 1 of the present invention is a cylindrical valve structure, including a valve plate 12 and a valve seat 13 divided by a cutout 11, and a sealing ring structure 14 for auxiliary installation. and internal blind holes 15, wherein:

One end of the cylindrical valve structure has a partially shrunken cylindrical shrinkage section 10, which is called a cut-off end, and a blind hole 15 is arranged inside it, and a cutout 11 is cut in the shrinkage section. The plane of the cutout 11 is in line with the cylindrical shape. The central axis of the structure is vertically arranged, and a valve plate 12 in the form of a cantilever beam will be formed between the cutout 11 and the end point of the contraction section 10, and the contact surface corresponding to the valve plate 12 on the other side of the cutout 11 forms a valve seat 13 The other end of the cylindrical structure is an installation end for connecting with other pipelines, and the outer surface of the valve connection end is arranged with a sealing ring structure 14, including a first sealing ring structure 141 and a second sealing ring structure 142, to realize When the valve is installed on the inner side of a pipeline 2, a seal is formed between the outer side of the installation end cylinder and the inner wall of the pipeline to ensure that the fluid can only flow through the cutout between the valve plate and the valve seat.

When working, the inside, outside or inside and outside of the installation end of the valve are connected to the pipeline at the same time and sealed. When the pressure at the end connected to the blind hole 15 inside the valve 1 is higher than the pressure outside the valve plate 12, under the action of the fluid, The cantilever beam valve plate 12 is deformed, and the cutout 11 is opened to form fluid outflow; when the pressure at the end communicating with the blind hole 15 inside the valve 1 is lower than the pressure outside the valve plate 12, under the action of the fluid, the cantilever beam valve plate 12 is Pressed on the valve seat 13, the notch 11 is closed and sealed to form a one-way cut-off, that is, a one-way cut-off capability is formed.

Claims (3)

1. An integral one-way valve (1), comprising: a cylindrical structural body with a blind hole (15) arranged inside, characterized in that it also includes: a cut-off end arranged with a contraction section (10) and an arrangement There is a sealing ring (14) and the installation end of the internal blind hole (15), the bottom surface of the blind hole (15) is located inside the contraction section (10), and the contraction section (10) is arranged with a cutout (11) as a division The valve plate (12) and the valve seat (13), the plane formed by the cutout (11) intersects the outer surface of the shrinkage section and the inner surface of the shrinkage section, between the cutout (11) and the end point of the shrinkage section (10) A valve plate (12) in the form of a cantilever beam is formed between them, and the corresponding contact surface of the valve plate (12) on the other side of the cutout (11) forms a valve seat (13). 2. The integral check valve according to claim 1, characterized in that: the cutting direction of the cutout (11) is not parallel to the center line of the integral cylindrical structure. 3. The integral check valve according to claim 1, characterized in that: the shrinkage section (10) can be columnar, conical or curved, and the bottom surface of the blind hole (15) is not in contact with the shrinkage section (15) The outer envelope surface interferes.