CN110067873A - A kind of pneumatic cut-off equipment rubber bush and pneumatic cut-off equipment - Google Patents

Abstract

This invention discloses a rubber sleeve for a pneumatic flow-stopping device. The rubber sleeve has a flow channel extending through both ends, and a groove is provided circumferentially along its outer surface. Corresponding to the groove, the rubber sleeve has an inwardly protruding section. The wall thickness of the rubber sleeve at the groove location is no greater than the wall thickness at other locations. In this pneumatic flow-stopping device, due to stress concentration at the groove, the rubber sleeve at the groove experiences greater stress than the surface stress at other locations. The hardness of the rubber sleeve at the protruding section is lower than that at other locations. When closed, the protrusion, acting as a sealing ring, enhances the sealing effect, reduces pressure, and achieves zero-leakage sealing, resulting in good sealing performance, cost savings, and high stability.

Description

A kind of rubber sleeve for pneumatic shut-off device and pneumatic shut-off device

technical field

The invention relates to the technical field of drainage, in particular to a rubber sleeve for a pneumatic shut-off device and a pneumatic shut-off device.

Background technique

The pneumatic shut-off device on the market includes an outer cover and a rubber sleeve. The outer cover and the rubber sleeve are sealed and connected to form an air cavity. The outer cover is provided with an air inlet. The rubber sleeve has a certain elasticity. When the air cavity is filled with compressed gas, The action of gas pressure makes the rubber sleeve compress inward to realize the action of closing the interception channel. When the air cavity releases the pressurized gas, the rubber sleeve recovers its deformation and realizes the action of opening the interception channel. However, the structure of the rubber sleeve in the prior art is relatively simple, and in order to achieve zero leakage in the closed state of the rubber sleeve, a relatively large air pressure is used. Taking the pneumatic shut-off device with the specifications of DN00-DN2000 as an example, in order to achieve zero leakage of the rubber sleeve, it is necessary to charge a gas pressure of more than 4 bar. The gas pressure is too high, and there is a danger of explosion during installation and use, and the use environment is limited. , and the inflation time is too long, and the input cost is high.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above-mentioned deficiencies of the background technology, and provide a rubber sleeve for a pneumatic shut-off device and a pneumatic shut-off device, which can achieve zero leakage under the action of lower gas pressure and have a good sealing effect.

The invention provides a rubber sleeve for a pneumatic shut-off device. The inside of the rubber sleeve is provided with a circulation channel running through both ends of the rubber sleeve, and a groove is provided along the outer surface of the rubber sleeve in the circumferential direction. The rubber sleeve is provided with inward projections.

On the basis of the above technical solution, the rubber sleeve at the protruding position and the rubber sleeve at other positions are integrally formed by vulcanization.

On the basis of the above technical solution, the wall thickness of the rubber sleeve at the groove position is not greater than the wall thickness of the rubber sleeve at other positions;

Or, the wall thickness of the rubber sleeve at the groove position is the same as the wall thickness of the rubber sleeve at other positions;

Or, the depth of the groove is the same as the wall thickness of the rubber sleeve at other positions;

Or, the depth of the groove is half of the wall thickness of the rubber sleeve at other locations.

On the basis of the above technical solutions, the cross-sectional shape of the groove is a trapezoid;

And/or the cross-sectional shape of the protrusion is a trapezoid.

On the basis of the above technical solution, the hardness of the rubber sleeve at the protruding position is lower than the hardness of the rubber sleeve at other positions.

On the basis of the above technical solutions, the height of the protrusions ranges from 10 to 80 mm.

On the basis of the above technical solutions, the width of the raised ring is 30-200 mm.

On the basis of the above technical solution, along the axial direction of the rubber sleeve, the groove is arranged in the middle of the rubber sleeve.

On the basis of the above technical solutions, flange connection parts protruding outward are provided at both ends of the rubber sleeve.

On the basis of the above technical solution, a pneumatic shut-off device includes:

The rubber sleeve as claimed in claim 9;

an outer cover, the outer cover is provided with an air inlet hole and an air outlet hole, and the flange connection part of the outer cover and the rubber sleeve is sealedly connected by a flange plate;

An air cavity is formed between the inner wall of the outer cover and the outer wall of the rubber sleeve, and the air inlet hole and the air outlet hole communicate with the air cavity.

Compared with the prior art, the advantages of the present invention are as follows:

(1) The outer surface of the rubber sleeve for the pneumatic shut-off device of the present invention is provided with grooves, and the stress at the groove is concentrated, so the surface stress value at the groove position is greater than the surface stress of the rubber sleeve at other positions. The rubber sleeve at the corresponding position of the groove is preferentially deformed inward. The hardness of the rubber sleeve at the convex position is lower than the hardness of the rubber sleeve at other positions. When closed, the bulge as a sealing ring can strengthen the The sealing effect can reduce the pressure while achieving zero leakage sealing, with good sealing effect, cost saving and high stability.

(2) The groove of the rubber sleeve for the pneumatic shut-off device of the present invention is arranged at the middle position of the rubber sleeve along the axis direction, so as to ensure that the rubber sleeves on both sides of the groove are uniformly stressed, deformed uniformly, and have better sealing effect. it is good.

Description of drawings

FIG. 1 is a schematic structural diagram of Embodiment 2 of the present invention.

FIG. 2 is a partial enlarged view of A in FIG. 1 .

Reference numerals: 1-rubber sleeve 1, 2-flow channel 2, 3-groove, 4-outer cover, 5-air inlet hole, 6-air outlet hole, 7-protrusion.

Detailed ways

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

Example 1

Referring to FIGS. 1 and 2 , the present invention provides a rubber sleeve 1 for a pneumatic shut-off device. The rubber sleeve 1 is internally provided with a circulation channel 2 penetrating both ends of the rubber sleeve 1 , along the outer surface of the rubber sleeve 1 . There is a ring of grooves 3 in the circumferential direction, the rubber sleeve 1 corresponding to the groove 3 is provided with a ring of inward protrusions 7, and the wall thickness of the rubber sleeve 1 at the position of the groove 3 is not greater than that of the rubber sleeves 1 at other positions. and the hardness of the rubber sleeve 1 at the position of the groove 3 is smaller than that of the rubber sleeve 1 at other positions. In this embodiment, the value range of the height H of the protrusion 7 is 10-80 mm, the value range of the ring width L of the protrusion 7 is 30-200 mm, and the rubber sleeve 1 at other positions and the groove 3 at the position The hardness of the rubber sleeve 1 is > 5 Shore hardness units. Preferably, in order to ensure the mechanical properties of the rubber sleeve 1 and the convenience of processing, the wall thickness of the rubber sleeve 1 at the position of the groove 3 is the same as the wall thickness of the rubber sleeve 1 at other positions, so as to avoid the protrusion 7 The location is subject to sharp objects.

In this embodiment, the rubber sleeve 1 at the position of the protrusion 7 and the rubber sleeve 1 at other positions are integrally formed by vulcanization, and the groove 3 and the protrusion 7 in this embodiment are coaxial with the rubber sleeve 1 set up.

Further, the inward depth of the groove 3 is the same as the wall thickness of the rubber sleeve 1 at other positions, or, the depth of the groove 3 is half of the wall thickness of the rubber sleeve 1 at other positions,

Further, according to the pneumatic shut-off devices of different specifications, the length of the groove 3 ranges from 10cm to 80cm.

In this embodiment, the cross-sectional shape of the groove 3 and the cross-sectional shape of the protrusion 7 are both trapezoidal, and the two side walls of the groove 3 are inclined to guide the flow to ensure that the gas pressure is concentrated at the position of the groove 3, and the position of the groove 3 is deformed first. , the protrusion 7 is the first to contact and seal, the sealing effect is good, and the closing speed is fast.

Example 2

Referring to Figures 1 and 2, the present invention provides a pneumatic shut-off device, which includes the rubber sleeve 1 in the above-mentioned Embodiment 1 and an outer cover. There are air inlet holes and air outlet holes, and the flange connection part of the outer cover and the rubber sleeve 1 is sealed and connected by the flange plate;

An air cavity is formed between the inner wall of the outer cover and the outer wall of the rubber sleeve 1, and the air inlet hole and the air outlet hole communicate with the air cavity

Referring to FIG. 1 and FIG. 2 , the present invention provides a pneumatic shut-off device, which includes any one of the rubber sleeves 1 and the outer cover 4 in the above-mentioned Embodiments 1 to 3. Both ends of the rubber sleeve 1 are provided with The outer cover 4 is provided with an air inlet hole 5 and an air outlet hole 6, and the flange connection part of the outer cover 4 and the rubber sleeve 1 is connected by a flange seal; the inner wall of the outer cover 4 and the outer wall of the rubber sleeve 1 are connected. An air cavity is formed therebetween, and the air inlet hole 5 and the air outlet hole 6 communicate with the air cavity. In this embodiment, the pneumatic shut-off device is connected to the air source. When the pneumatic shut-off device is inflated, the groove 3 of the rubber sleeve 1 is first deformed, the protrusion 7 is the first to contact, and the circulation channel 2 is closed. When the pneumatic shut-off device is deflated , the groove 3 of the rubber sleeve 1 quickly recovers and deforms, and the circulation channel 2 is connected. In the cut-off state, only a small pressure is needed to achieve zero leakage sealing, the sealing effect is good, and the closing and opening are faster.

Compare the pneumatic interception device of the present embodiment with the pneumatic interception device in the prior art, wherein, the pneumatic interception device is suitable for a pipe diameter of 600 mm, and the use environment is 1 m head, and the comparison is as follows:

Pressure value sealing effect current technology Above 4bar drip leak Example 2 1.8bra Zero leakage

It can be seen that the required pressure value of the pneumatic shut-off device in the present embodiment is smaller, and the sealing effect is better, and the use of pressure vessels is subject to the constraints of "National Standard of the People's Republic of China: Pressure Vessels (GB 150.1-150.4-2011)", The air pressure value required in this embodiment is small, which can meet the requirements of the standard, has a wide application range, high safety, and a good market prospect. Using the rubber sleeve in this embodiment, the smaller the compressed air pressure in the air cavity, the lower the material cost of the equipment cover; the lower the pressure on the rubber sleeve when it is closed, the longer its service life will be. Longer; it will be safer when the equipment is installed, debugged and used.

Those skilled in the art can make various modifications and variations to the embodiments of the present invention, and if these modifications and variations are within the scope of the claims of the present invention and its equivalent technology, then these modifications and variations are also within the protection scope of the present invention .

The content not described in detail in the specification is the prior art known to those skilled in the art.

Claims (10)

1. A rubber sleeve for a pneumatic shut-off device, characterized in that: the inside of the rubber sleeve is provided with a circulation channel running through both ends of the rubber sleeve, and a groove is provided along the outer surface of the rubber sleeve in the circumferential direction, and the groove is provided. The corresponding rubber sleeves are provided with inward protrusions. 2 . The sleeve structure for a pneumatic shut-off device according to claim 1 , wherein the rubber sleeve at the protruding position and the rubber sleeve at other positions are integrally formed by vulcanization. 3 . 3. The sleeve structure for a pneumatic shut-off device according to claim 1, wherein the wall thickness of the rubber sleeve at the groove position is not greater than the wall thickness of the rubber sleeve at other positions; Or, the wall thickness of the rubber sleeve at the groove position is the same as the wall thickness of the rubber sleeve at other positions; Or, the depth of the groove is the same as the wall thickness of the rubber sleeve at other positions; Or, the depth of the groove is half of the wall thickness of the rubber sleeve at other locations. 4. The rubber sleeve for a pneumatic shut-off device according to claim 3, wherein the cross-sectional shape of the groove is a trapezoid; And/or the cross-sectional shape of the protrusion is a trapezoid. 5 . The rubber sleeve for a pneumatic shut-off device according to claim 1 , wherein the hardness of the rubber sleeve at the protruding position is lower than the hardness of the rubber sleeve at other positions. 6 . . 6 . The rubber sleeve for a pneumatic shut-off device according to claim 1 , wherein the height of the protrusions ranges from 10 to 80 mm. 7 . 7 . The rubber sleeve for a pneumatic shut-off device according to claim 1 , wherein the raised ring width is 30-200 mm. 8 . 8 . The rubber sleeve for a pneumatic shut-off device according to claim 1 , wherein the groove is arranged in the middle of the rubber sleeve along the axial direction of the rubber sleeve. 9 . 9 . The rubber sleeve for a pneumatic shut-off device according to any one of claims 1 to 8 , wherein the two ends of the rubber sleeve are provided with outwardly protruding flange connection parts. 10 . 10. A pneumatic shut-off device, characterized in that, comprising: The rubber sleeve as claimed in claim 9; an outer cover, the outer cover is provided with an air inlet hole and an air outlet hole, and the flange connection part of the outer cover and the rubber sleeve is sealedly connected by a flange plate; An air cavity is formed between the inner wall of the outer cover and the outer wall of the rubber sleeve, and the air inlet hole and the air outlet hole communicate with the air cavity.