CN211039842U

CN211039842U - Back pressure valve

Info

Publication number: CN211039842U
Application number: CN201921829405.0U
Authority: CN
Inventors: 刘茯蔚; 王理博
Original assignee: Xiongchuan Valve Technology Hebei Co ltd
Current assignee: Henan Xiongchuan Fluid Engineering Co ltd
Priority date: 2019-10-29
Filing date: 2019-10-29
Publication date: 2020-07-17
Anticipated expiration: 2029-10-29

Abstract

The utility model discloses a back pressure valve, including O shape rubber circle an, valve body, housing screw and O shape rubber circle b, housing screw's inside is equipped with the hollow structure hole, the inboard upper end in hollow structure hole compresses tightly the installation with the outside of head cylinder section, head cylinder section sets up the lower extreme at inside support ring an, the outside of head cylinder section is cylinder section diameter, cylinder section diameter and hollow structure hole precision fit, it is regional to constitute the dovetail between the upper end of inside support ring an and the housing screw, install in the dovetail district O shape rubber circle b, housing screw's outside lower part compresses tightly the installation with the valve body. The dovetail groove is redesigned by utilizing the characteristic that the dovetail groove can effectively restrain the O-shaped rubber sealing ring, the manufacturing difficulty is reduced, the production cost is saved, the characteristic that the standardized O-shaped rubber sealing ring can be used in the design of the dovetail groove is exerted, and a foundation is laid for low manufacturing cost and convenience in purchase and maintenance.

Description

Back pressure valve

Technical Field

The utility model relates to a valve field of making, concretely relates to back pressure valve.

Background

The back pressure valve, often referred to as a surge tank valve, is a valve having surge tank capability. The pressure stabilizing performance of the back pressure valve refers to the performance of stabilizing the pressure at the inlet end. When the pipeline pressure at the inlet end rises, the backpressure valve releases an overpressure part exceeding the set pressure, so that the pressure at the inlet end returns to the set pressure, namely a backpressure valve pressure stabilizing mechanism.

When the O-shaped rubber sealing ring is in a working state, the O-shaped rubber sealing ring deforms from the end with high pressure to the end with low pressure under the action of pressure, so that the O-shaped rubber sealing ring deforms from outside to inside (center) in the radial direction, and the O-shaped rubber sealing ring breaks away from the groove in serious conditions, so that sealing failure is caused. The O-shaped rubber sealing ring is vulcanized into the rectangular groove of the compression screw and is consolidated into a whole, and the design really solves the hidden trouble of separation of the O-shaped rubber sealing ring. However, the working media of the valve are different, rubber made of a plurality of materials is needed in order to resist chemical corrosion of different media, a plurality of sealing assemblies made of different materials are needed to be customized invisibly, and the inventory is increased, but the cost is increased.

In order to completely restrict the risk of the O-ring breaking away from the groove, a new design has been developed, as shown in fig. 1, in which the groove accommodating the O-ring is a dovetail groove. However, because of the influence of the dexterity trend of valve design, the O-shaped rubber sealing ring tends to adopt a specification with a smaller diameter, a smaller inner diameter, so that a dovetail groove for accommodating the O-shaped rubber sealing ring is very small, the manufacturing difficulty is greatly increased, and the production cost is increased.

Disclosure of Invention

In view of the above-mentioned defects or shortcomings in the prior art, it is desirable to provide a back pressure valve, which solves the problems of difficulty in manufacturing a dovetail groove for accommodating an O-shaped rubber seal ring and high production cost.

According to the technical scheme that this application embodiment provided, a back pressure valve, including O shape rubber circle b, valve body, housing screw and O shape rubber circle an, housing screw's inside is equipped with the hollow structure hole, the inboard upper end in hollow structure hole compresses tightly the installation with the outside of head cylinder section, the head cylinder section sets up the lower extreme at inside support ring an, the outside of head cylinder section is cylinder section diameter, cylinder section diameter and hollow structure hole precision fit, constitute the dovetail region between the upper end of inside support ring a and the housing screw, install in the dovetail region O shape rubber circle b, housing screw's outside lower part compresses tightly the installation with the valve body, install between housing screw's lower extreme and the valve body O shape rubber circle a.

In the utility model discloses, the lateral wall of inner support ring an upper end is equipped with the inclined plane an to the housing screw direction slope, the angle of inclined plane a slope is 23-25.

In the utility model discloses, the inside wall of housing screw upper end is equipped with inclined plane b to the slope of interior support ring a direction, the angle of inclined plane b slope is 23-25.

The utility model discloses in, housing screw jointly encloses into the dovetail region of forked tail shape with inside support ring a, the width of the regional upper end of dovetail is less than the lower extreme.

The utility model discloses in, O shape rubber circle b passes through the regional restraint of dovetail, O shape rubber circle b's diameter is one of 1.78mm and 1.8 mm.

In the utility model discloses, the width of the upper end opening district in dovetail region is 1.55-1.65 mm.

In the utility model discloses, the degree of depth in dovetail region is 1.27-1.31 mm.

To sum up, the beneficial effect of this application: the dovetail groove is redesigned by utilizing the characteristic that the dovetail groove can effectively restrain the O-shaped rubber sealing ring, the manufacturing difficulty is reduced, the production cost is saved, the characteristic that the standardized O-shaped rubber sealing ring can be used in the design of the dovetail groove is exerted, and a foundation is laid for low manufacturing cost and convenience in purchase and maintenance.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

FIG. 1 is a schematic structural diagram of a dovetail groove in the prior art;

FIG. 2 is an enlarged view of A-A of the background art of FIG. 1;

FIG. 3 is a schematic view of the overall structure of the present invention;

FIG. 4 is an enlarged view of the dovetail groove region of the present invention;

fig. 5 is a schematic structural diagram of embodiment 2 of the present invention.

Reference numbers in the figures: an O-shaped rubber ring b-1; a valve body-2; a compression screw-3; a bevel b-31; an O-shaped rubber ring a-4; an inner support ring a-5; a bevel a-51; hollow structure hole-6; the diameter of the cylindrical section is-7; a head cylindrical section-8; dovetail groove region-9; support ring b-10.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Referring to fig. 3, the back pressure valve includes an O-shaped rubber ring b1, a valve body 2, a compression screw 3 and an O-shaped rubber ring a4, wherein a hollow structure hole 6 is formed in the compression screw 3, the upper end of the inner side of the hollow structure hole 6 is mounted on the outer side of a head cylindrical section 8 in a compression manner, the head cylindrical section 8 is arranged at the lower end of an inner support ring a5, the outer side of the head cylindrical section 8 is a cylindrical section with a diameter 7, the cylindrical section with the diameter 7 is precisely matched with the hollow structure hole 6, a dovetail groove area 9 is formed between the upper end of the inner support ring a5 and the compression screw 3, the O-shaped rubber ring b1 is mounted in the dovetail groove area 9, the lower portion of the outer side of the compression screw 3 is mounted on the valve body 2 in a compression manner, and the O-shaped rubber ring a4 is mounted between the.

As shown in fig. 3, the outer side wall of the upper end of the inner support ring a5 is provided with a slope a51 inclined towards the direction of the compression screw 3, and the angle of the slope a51 is 23-25 °. The inner side wall of the upper end of the compression screw 3 is provided with a slope b31 inclined towards the inner supporting ring a5, and the angle of inclination of the slope b31 is 23-25 degrees. The compression screws 3, in conjunction with the inner support ring a5, enclose a dovetail-shaped dovetail groove region 9, the width of the upper end of the dovetail groove region 9 being smaller than the lower end. The O-shaped rubber ring b1 is constrained by the dovetail groove region 9, and the diameter of the O-shaped rubber ring b1 is one of 1.78mm and 1.8 mm. The width of the upper end opening area of the dovetail groove area 9 is 1.55-1.65 mm. The depth of the dovetail groove region 9 is 1.27-1.31 mm.

Example 1, working principle of the back pressure valve: the pressure in the inlet end region is equal, both at pressure P1, when the back pressure valve is in steady state operation. When abnormal pressurization occurs, the pressure P1 can rise to (P1+ delta P), the force balance between the pressure P1 and the force bearing spring is broken, and the diaphragm is pushed to move upwards. The sealing ring is separated from the sealing seat, and the fluid medium flows to the outlet end. At this time, the inlet end pressure (P1+ Δ P) decreases until it decreases to P1, and the pre-boost equilibrium state is reached again. The sealing of the sealing ring and the sealing seat is a key link of the pressure stabilizing performance of the back pressure valve. Because the seal is responsible for isolating the inlet area and the outlet area of the backpressure valve, once the seal fails, the inlet area and the outlet area are communicated, and the pressure stability of the backpressure valve loses functions.

The most obvious feature of this technical scheme compared with the background art in fig. 2 is the design structure of the dovetail groove, and in fig. 2, the dovetail groove is located on the compression screw and is difficult to manufacture. In fig. 3, the dovetail groove of the present embodiment is a combined structure, and is formed by combining a part 3 compression screw and a part 5 internal support ring a to form a dovetail shape. The complex cross-sectional shape of the whole is changed into a simple shape formed by combining an inner simple inclined plane and an outer simple inclined plane, and finally, a part difficult to machine is changed into two simple parts easy to machine.

Embodiment 2, as shown in fig. 5, is another dovetail groove design structure, and the support ring b10 is an extension of the dovetail groove design structure of the present invention, in which the inside is changed into the outside.

The foregoing description is only exemplary of the preferred embodiments of the application and is provided for the purpose of illustrating the general principles of the technology and the like. Meanwhile, the scope of the invention according to the present application is not limited to the technical solutions in which the above-described technical features are combined in a specific manner, and also covers other technical solutions in which the above-described technical features or their equivalent are combined arbitrarily without departing from the inventive concept described above. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. The utility model provides a back pressure valve, includes O shape rubber circle b (1), valve body (2), housing screw (3) and O shape rubber circle a (4), characterized by: the inside of housing screw (3) is equipped with hollow structure hole (6), the inboard upper end in hollow structure hole (6) compresses tightly the installation with the outside of head cylinder section (8), head cylinder section (8) set up the lower extreme in inside support ring a (5), the outside of head cylinder section (8) is cylinder section diameter (7), cylinder section diameter (7) and hollow structure hole (6) precision fit, constitute dovetail region (9) between the upper end of inside support ring a (5) and housing screw (3), install in dovetail region (9) O shape rubber circle b (1), the outside lower part and the valve body (2) of housing screw (3) compress tightly the installation, install between the lower extreme of housing screw (3) and valve body (2) O shape rubber circle a (4).

2. A back pressure valve as claimed in claim 1, wherein: the outer side wall of the upper end of the inner support ring a (5) is provided with a slope a (51) inclined towards the direction of the compression screw (3), and the inclination angle of the slope a (51) is 23-25 degrees.

3. A back pressure valve as claimed in claim 1, wherein: the inner side wall of the upper end of the compression screw (3) is provided with a slope b (31) which inclines towards the inner support ring a (5), and the inclination angle of the slope b (31) is 23-25 degrees.

4. A back pressure valve as claimed in claim 1, wherein: the compression screw (3) and the inner support ring a (5) jointly form a dovetail groove area (9) in a dovetail shape, and the width of the upper end of the dovetail groove area (9) is smaller than that of the lower end of the dovetail groove area.

5. A back pressure valve as claimed in claim 1, wherein: the O-shaped rubber ring b (1) is restrained by a dovetail groove area (9), and the diameter of the O-shaped rubber ring b (1) is one of 1.78mm and 1.8 mm.

6. A back pressure valve as claimed in claim 1, wherein: the width of the upper end opening area of the dovetail groove area (9) is 1.55-1.65 mm.

7. A back pressure valve as claimed in claim 1, wherein: the depth of the dovetail groove area (9) is 1.27-1.31 mm.