阅读说明：本技术 一种具有多孔进出口结构的新型背压阀 (Novel back pressure valve with porous inlet and outlet structure ) 是由 王玉华 于 2019-10-19 设计创作，主要内容包括：本发明公开了一种具有多孔进出口结构的新型背压阀,属于背压阀领域,包括自上向下相连接的阀盖和阀体,所述阀盖和阀体之间连接有膜片；阀盖顶部开设先导气孔,先导气孔通过阀盖内部开设的气源通道连通至阀盖底部开设的供膜片中部起伏运动的活动槽,形成上下贯通的通路；阀体侧壁上分别开设相对设置的介质入口和介质出口,介质入口与阀体上表面开设的多个入口小孔相连通,介质出口与阀体上表面开设的多个出口小孔相连通；整个动作无摩擦,不会产生压力滞后,入口压力稳定性高,具备更大的流通能力。(The invention discloses a novel back pressure valve with a porous inlet and outlet structure, which belongs to the field of back pressure valves and comprises a valve cover and a valve body which are connected from top to bottom, wherein a diaphragm is connected between the valve cover and the valve body; the top of the valve cover is provided with a pilot air hole which is communicated to a movable groove which is arranged at the bottom of the valve cover and used for the middle part of the diaphragm to move up and down through an air source channel arranged in the valve cover to form a through passage which is communicated up and down; the side wall of the valve body is respectively provided with a medium inlet and a medium outlet which are oppositely arranged, the medium inlet is communicated with a plurality of inlet small holes arranged on the upper surface of the valve body, and the medium outlet is communicated with a plurality of outlet small holes arranged on the upper surface of the valve body; the whole action has no friction, no pressure lag is generated, the stability of inlet pressure is high, and the device has larger flow capacity.)

1. A novel back pressure valve with a porous inlet and outlet structure comprises a valve cover (5) and a valve body (1) which are connected from top to bottom, and is characterized in that a diaphragm (3) is connected between the valve cover (5) and the valve body (1); the top of the valve cover (5) is provided with a pilot air hole (5-1), the pilot air hole (5-1) is communicated to a movable groove (5-3) which is arranged at the bottom of the valve cover (5) and is used for the middle part of the diaphragm (3) to move up and down through an air source channel (5-2) arranged in the valve cover (5) to form a passage which is communicated up and down; the side wall of the valve body (1) is respectively provided with a medium inlet (1-1) and a medium outlet (1-2) which are oppositely arranged, the medium inlet (1-1) is communicated with a plurality of inlet small holes (7) arranged on the upper surface of the valve body (1), and the medium outlet (1-2) is communicated with a plurality of outlet small holes (8) arranged on the upper surface of the valve body (1).

2. The novel back pressure valve with the porous inlet and outlet structure is characterized in that a medium inlet (1-1) is communicated with a plurality of inlet small holes (7) through a plurality of inlet pipelines (1-4) communicated with inlet channels (1-3), and the inlet pipelines (1-4) are in one-to-one correspondence with the inlet small holes (7); the medium outlets (1-2) are communicated with the outlet holes (8) through a plurality of outlet pipelines (1-6) communicated with the outlet channels (1-5), and the outlet pipelines (1-6) are in one-to-one correspondence with the outlet holes (8).

3. A new backpressure valve with porous inlet and outlet structure, according to claim 2, characterized by the number of inlet orifices (7) being greater than the number of outlet orifices (8).

4. The new back pressure valve with porous inlet and outlet structure as claimed in claim 1, characterized by that, there is a sealing ring a (2) between the valve body (1) and the diaphragm (3), and there is a sealing ring b (4) between the valve cover (5) and the diaphragm (3).

5. The novel back pressure valve with the porous inlet and outlet structure is characterized in that an annular groove a (9) is formed in the top of the valve body (1), and a sealing ring a (2) is arranged in the groove a (9); the bottom of the valve cover (5) is provided with an annular groove b (10), and a sealing ring b (4) is arranged in the groove b (10).

6. The new back pressure valve with porous inlet and outlet structure as claimed in claim 1, characterized in that the outer diameters of the valve cover (5), the valve body (1) and the diaphragm (3) are the same, and the thickness of the valve cover (5) and the valve body (1) is larger than that of the diaphragm (3).

7. The new back pressure valve with porous inlet and outlet structure as claimed in claim 6, characterized in that the valve cover (5), the valve body (1) and the diaphragm (3) are all provided with a plurality of connecting through holes (11), and the connecting through holes (11) of the three are in one-to-one correspondence and connected through fasteners (6).

8. The new back pressure valve with porous inlet and outlet structure as claimed in claim 1, characterized in that the membrane (3) has a thickness of 0.01-2 mm.

9. The new type back pressure valve with porous inlet and outlet structure as claimed in claim 1, characterized in that the movable groove (5-3) is long strip.

Technical Field

The invention relates to a back pressure valve, in particular to a back pressure valve which is directly sealed by a diaphragm and a valve body and has a porous inlet and outlet structure.

Background

Traditional back pressure valve all has a disk seat of fixing on the valve body, and this disk seat closely laminates with the case, reaches sealed effect. It provides the basic pressure control for most simple processes, in which design a pre-set loading force is provided by a spring or other means that seals the poppet against the valve seat. When the force of the pipeline pressure acting on the valve core is the same as the loading force, the back pressure valve normally works in a preset pressure state; when the pressure at the inlet end of the valve rises, so that the force acting on the valve core exceeds the preset loading force, the valve core is separated from the valve seat, and the redundant pressure at the inlet end is released until the preset pressure is recovered.

Traditional back pressure valve structure, under the condition that instantaneous flow change is great, or inlet pressure fluctuation is frequent, the precision of control pressure is lower, the reason is as follows: 1. because most of traditional backpressure valves with the numerical control pressure exceeding 20bar adopt a piston mode as a load mechanism of the valve core, an O-shaped sealing ring in the piston increases the action friction, so that the action of the valve core is blocked; 2. the inlet and outlet flow channels of the traditional back pressure valve are mostly single passages with fixed sectional areas, when the flow of the valve inlet is rapidly increased or reduced, the Cv value (flow capacity) of the valve is not changed, so that the pressure of the inlet is severely fluctuated; 3. the valve core and the valve seat of the traditional back pressure valve have stress or friction during fitting due to sealing requirements, and the valve core and the valve seat are mutually worn and consumed due to frequent opening and closing, so that the initial shape is damaged, and the Cv value is unpredictably changed.

Disclosure of Invention

In order to solve the defects in the prior art, the invention provides the novel back pressure valve with the porous inlet and outlet structure, the whole action has no friction, the pressure lag cannot be generated, the inlet pressure stability is high, and the novel back pressure valve has larger circulation capacity.

The technical scheme adopted by the invention for solving the technical problem is as follows: a novel back pressure valve with a porous inlet and outlet structure comprises a valve cover and a valve body which are connected from top to bottom, wherein a diaphragm is connected between the valve cover and the valve body; the top of the valve cover is provided with a pilot air hole which is communicated to a movable groove which is arranged at the bottom of the valve cover and used for the middle part of the diaphragm to move up and down through an air source channel arranged in the valve cover to form a through passage which is communicated up and down; the side wall of the valve body is respectively provided with a medium inlet and a medium outlet which are oppositely arranged, the medium inlet is communicated with the plurality of inlet small holes arranged on the upper surface of the valve body, and the medium outlet is communicated with the plurality of outlet small holes arranged on the upper surface of the valve body.

Furthermore, the medium inlet is communicated with the inlet small holes through a plurality of inlet pipelines communicated with the inlet channel, and the inlet pipelines are in one-to-one correspondence with the inlet small holes; the medium outlet is communicated with the outlet holes through a plurality of outlet pipelines communicated with the outlet channel, and the outlet pipelines are in one-to-one correspondence with the outlet holes.

Further, the number of inlet apertures is greater than the number of outlet apertures.

Furthermore, a sealing ring a is arranged between the valve body and the diaphragm, and a sealing ring b is arranged between the valve cover and the diaphragm.

Furthermore, the top of the valve body is provided with an annular groove a, and a sealing ring a is arranged in the groove a; the bottom of the valve cover is provided with an annular groove b, and a sealing ring b is arranged in the groove b.

Furthermore, the outer diameters of the valve cover, the valve body and the diaphragm are the same, and the thicknesses of the valve cover and the valve body are larger than that of the diaphragm.

Furthermore, a plurality of connecting through holes are formed in the valve cover, the valve body and the diaphragm, and the connecting through holes of the valve cover, the valve body and the diaphragm are in one-to-one correspondence and are connected through fasteners.

Furthermore, the thickness of the membrane is 0.01-2 mm.

Furthermore, the movable groove is long.

The invention has the beneficial effects that: the number of accessories is small, the structure is simple, the maintenance is convenient, and the failure rate is low; the diaphragm is used as the only moving part, so that the whole action has no friction and no pressure lag is generated; the structural design of the porous valve body is suitable for minimizing pressure disturbance in two-phase flow, and the stability of inlet pressure can be maintained; the porous channel structure ensures that the flow capacity of the back pressure valve is a range value and can be automatically adjusted along with the change of medium flow, so that the pressure fluctuation controlled by the back pressure valve is smaller under the condition of severe inlet pressure and flow fluctuation; the direct joint of the diaphragm and the valve body enables the back pressure valve to have larger flow capacity.

Drawings

FIG. 1 is an exploded view of the present invention;

FIG. 2 is another exploded view of the present invention;

FIG. 3 is a cross-sectional view of the present invention;

FIG. 4 is a first state diagram of the present invention;

FIG. 5 is a second state diagram of the present invention;

FIG. 6 is a third state diagram of the present invention.

The reference numbers in the figures are as follows: 1. the valve comprises a valve body, 1-1 parts of a medium inlet, 1-2 parts of a medium outlet, 1-3 parts of an inlet channel, 1-4 parts of an inlet pipeline, 1-5 parts of an outlet channel, 1-6 parts of an outlet pipeline, 2 parts of a sealing ring a, 3 parts of a diaphragm, 4 parts of a sealing ring b, 5 parts of a valve cover, 5-1 parts of a pilot air hole, 5-2 parts of an air source channel, 5-3 parts of a movable groove, 6 parts of a fastening piece, 7 parts of an inlet small hole, 8 parts of an outlet small hole, 9 parts of a groove a, 10 parts of a groove b, 11 parts of a connecting through hole.

Detailed Description

The invention is further described below with reference to fig. 1-6.