CN215173076U - Pressure measuring joint soft sealing mechanism - Google Patents
Pressure measuring joint soft sealing mechanism Download PDFInfo
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- CN215173076U CN215173076U CN202120348672.7U CN202120348672U CN215173076U CN 215173076 U CN215173076 U CN 215173076U CN 202120348672 U CN202120348672 U CN 202120348672U CN 215173076 U CN215173076 U CN 215173076U
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- sealing gasket
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Abstract
The invention discloses a pressure measuring joint soft sealing mechanism which comprises a valve core, a valve seat and a spring, wherein the valve seat is formed by a valve seat body, a soft sealing gasket, a pressing cover and a pressure measuring joint body, the soft sealing gasket is positioned in a cavity, and the end face of an annular sealing boss on the valve core is contacted with the soft sealing gasket to form sealing. The invention has simple mechanism design and easy processing, and simultaneously, because the annular sealing boss on the valve seat is vertical to the surface of the soft sealing gasket, the destructive shearing force to the surface of the soft sealing gasket in the use process of the valve is avoided, thereby effectively protecting the surface of the soft sealing gasket and solving the defects in the prior art.
Description
Technical Field
The invention relates to the technical field of sealing of pressure measuring connectors, in particular to a soft sealing mechanism of a pressure measuring connector.
Background
The pressure measuring joint in the ISO15171-2 standard form is widely applied to the hydraulic and gas industries, and the sealing mechanism of the pressure measuring joint mainly comprises three main forms, namely ball sealing, piston soft sealing and conical surface soft sealing in the current market.
The ball seal is formed by hard contact between the steel ball and the sealing surface on the valve seat, can bear higher pressure, but has high requirement on the machining precision of the valve seat, and is difficult to meet the requirement of common equipment.
The piston soft seal and the conical surface soft seal are two common soft seal forms of the pressure measuring joint, a soft seal groove is added in the middle of the metal valve core, and the soft seal forms seal between the valve core and the valve seat, so that the two seal structures are easier to process compared with a ball seal structure. The two soft sealing mechanisms have a common characteristic that in a free state, the outermost side face of the soft seal must protrude out of the outer surface of the metal valve core, and the width of the soft seal groove must be larger than the thickness of the soft seal so as to ensure that the soft seal material can deform and form a seal under pressure. The structure is characterized in that when the pressure measuring joint is about to be opened and a small gap is formed between the valve core and the valve seat, the side face of the soft seal is pushed to a sharp angle of the side of the soft seal groove due to internal pressure, and a shearing force is formed in the soft seal.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a soft sealing mechanism of a pressure measuring joint, which adopts a soft sealing mode in an annular cavity body, has higher sealing specific pressure and is easy to process, and simultaneously eliminates the internal shearing force causing the damage of the soft sealing surface as described in the background technology, thereby solving the defects of the prior art.
The technical scheme is as follows:
in order to solve the above problems, the present invention provides the following technical solutions: a pressure measuring joint soft sealing mechanism is characterized by comprising:
the valve core is sequentially divided into a push rod part, an annular sealing boss part, a rod body part and a spring mounting step part, the push rod part is cylindrical, the rear part of the push rod is connected with the rod body, a circle of annular sealing boss is arranged on the end face of the rod body, the inner diameter of the annular sealing boss is larger than the outer diameter of the push rod, the outer diameter of the annular sealing boss is smaller than the outer diameter of the rod body, the other end of the rod body is provided with a spring mounting step, and the outer diameter of the step is smaller than the diameter of the rod body;
the valve seat is formed by a valve seat body, a soft sealing gasket, a pressing cover and a pressure measuring joint body, and the soft sealing gasket is cylindrical with an inner hole; the valve seat body is provided with external threads, the center of the valve seat body is provided with a flow passage hole, the flow passage hole is in clearance fit with the outer diameter of the valve core push rod part, the end head of the valve seat body is a small step circle, the outer diameter of the small step circle is smaller than the inner diameter of the annular sealing boss of the valve core, a sealing gasket groove is formed after the small step circle, the outer diameter of the sealing gasket groove is in tight fit with the inner diameter of the soft sealing gasket, the groove width is larger than the thickness of the soft sealing gasket, and a large step circle is formed after the sealing gasket groove; the gland is cylindrical in shape, the inner hole is divided into a large inner hole and a small inner hole through a step, the outer diameter of the large inner hole is tightly matched with the outer diameter of the soft sealing gasket and is in transition fit with a large step circle on the valve seat body, the depth of the large step hole is larger than the sum of the length of the large step circle on the valve seat body and the thickness of the soft sealing gasket, and the diameter of the small inner hole is in clearance fit with the outer diameter of the annular sealing boss of the valve core; when the soft sealing gasket is arranged in the sealing groove of the valve seat body, and the large inner hole end of the pressing cover and the large step circle on the valve seat body are pressed together, the pressing cover and the valve seat body form a cavity with an annular opening for installing the soft sealing gasket; the pressure measuring connector body is internally provided with an internal thread hole matched with the external thread on the valve seat body, and the lower end of the internal thread hole is provided with a gland blocking step;
and the compression spring is arranged on a spring installation step on the valve core and used for pushing the valve core when no pressure exists in the pressure measuring joint, and the end surface of the annular sealing boss on the valve core is attached to the top surface of the soft sealing gasket.
Preferably, the valve core push rod end is provided with a blind hole, and the blind hole is connected with a radial through hole, so that when the pressure measuring joint is completely opened, the internal fluid can quickly flow out, and the impact of the fluid in the joint on the surface of the soft sealing gasket when the fluid rushes out is reduced.
(III) advantageous effects
The pressure measuring joint soft sealing mechanism is simple in structure and easy to process, the surface of the soft sealing gasket is always attached to and wrapped on the end face of the annular sealing boss of the valve core under the action of internal pressure before the valve core of the pressure measuring joint is pushed open by the ejector rod of the pressure measuring gauge line, namely before the pressure measuring joint is opened, and when the end face of the annular sealing boss is separated from the surface of the soft sealing gasket once, namely the pressure measuring joint is opened, the internal pressure of the system can push the soft sealing gasket to the bottom of the cavity where the soft sealing gasket is located. In the opening and closing process of the pressure measuring joint, the soft sealing gasket cannot be subjected to destructive shearing force caused by the soft sealing in the background art, so that the sealing effect is ensured, and the damage of the soft sealing is also prevented.
Drawings
FIG. 1 is a schematic view of a pressure tap employing the soft sealing mechanism of the present invention in a sealed state;
FIG. 2 is a schematic illustration of the valve seat body portion of the mechanism of the present invention;
FIG. 3 is a schematic view of the gland structure of the mechanism of the present invention;
FIG. 4 is a schematic view of a portion of the pressure tap body valve seat installation configuration using the mechanism of the present invention;
FIG. 5 is a schematic view of the valve cartridge configuration of the mechanism of the present invention;
FIG. 6 is a schematic view of a pressure tap employing the soft sealing mechanism of the present invention in a fully open state;
the reference numerals are explained below:
1 valve seat body, 2 gland, 3 valve core, 4 soft sealing gasket, 5 compression spring and 6 pressure measuring joint body
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described with reference to the following embodiments.
Referring to fig. 2, a schematic partial structure of the valve seat body 1 is shown, wherein 11 is a flow passage hole of the valve seat body, 12 is a small step circle at the end, 13 is a gasket groove, the side surfaces 131 and 14 of the gasket groove are large step circles, and the side surfaces 141 and 15 behind the large step circles are external threads connected with the pressure measuring connector body 6;
fig. 3 shows a schematic structural view of the gland 2, in which 21 is a large inner hole, 22 is a small inner hole, 23 is a left side surface, 24 is an outer diameter, and 25 is a right side surface;
FIG. 4 is a schematic view of a portion of the pressure tap body valve seat assembly utilizing the mechanism of the present invention, wherein 61 is the internal connection threads on the pressure tap body and 62 is the gland stop step; the assembling step is that the soft sealing gasket 4 is arranged in a sealing gasket groove 13 of the valve seat body, then a large inner hole 21 on a gland is pressed with a large step circle 14 on the valve seat body, the gland 2 and the valve seat body 1 form a cavity with an annular opening for installing the soft sealing gasket 4, then the valve seat body and the pressure measuring joint body are connected together through a thread 61, and the right side surface 25 of the gland is attached to a gland blocking step 62 on the pressure measuring joint body;
FIG. 5 is a schematic structural view of the valve cartridge 3, wherein 31 is a push rod portion, 32 is an annular sealing boss, 33 is a rod portion, 331 is a stop step surface, 34 is a spring mounting step, and a blind hole 35 is formed in the center of 31 and connected with a side through hole 36;
fig. 1 is a schematic diagram of a pressure measuring joint using the soft sealing mechanism of the present invention in a sealed state, showing the schematic positions of the components of the structure of the present invention when there is no internal pressure, the valve seat body 1, the gland 2, the soft sealing pad 4 and the pressure measuring joint body 6 together form a complete valve seat, and the end face of the annular sealing boss 32 is attached to the end face of the soft sealing pad 4 under the action of the compression spring 5 of the valve core 3.
FIG. 6 shows a schematic view of a pressure tap employing the soft sealing mechanism of the present invention in a fully open state;
the specific working principle is as follows:
according to the pressure measuring joint soft sealing mechanism disclosed by the invention, referring to fig. 1, a valve seat body 1, a gland 2, a soft sealing gasket 4 and a pressure measuring joint body 6 jointly form a complete valve seat, and when no pressure exists in the system, under the action of a spring 5, a seal is formed between the end surface of an annular sealing boss 32 on a valve core 3 and the end surface of the soft sealing gasket 4 in the valve seat; when pressure exists in the system, the valve core 3 is pushed to the valve seat by the pressure, the soft sealing gasket 4 deforms under the action of the pressure and is attached to the end face of the annular sealing boss 32 on the valve core 3 so as to keep a sealing state; when the pressure in the system is increased to a certain value, the stop step 331 on the valve core 3 is attached to the right side surface 25 of the gland, and at the moment, even if the pressure in the system is further increased, the valve core is kept in a stop state, so that the soft sealing gasket 4 is prevented from being excessively deformed under high pressure and is always positioned in the annular cavity of the valve seat;
when a pressure measuring joint applying the mechanism of the invention is connected with a pressure gauge line, a pressure measuring needle is pressed against the top end of a push rod part 31 of a valve core 3, the whole valve core is pressed to the right side, a compression spring 5 is compressed, when the end surface of an annular sealing boss 32 on the valve core 3 is separated from the surface of a soft sealing gasket 4, the pressure measuring joint is opened, right-side fluid flows out through a gap between the push rod part 31 of the valve core 3 and a flow passage hole 11 on a valve seat body 1, and the valve core is continuously pushed to the right side by the pressure measuring needle to a final pressure measuring position as shown in fig. 6, the right-side fluid flows out towards the pressure measuring needle through a radial through hole 36 and a blind hole 35 on the valve core 3.
Before the pressure measuring joint is opened, under the effect of internal pressure, the surface of the soft sealing gasket 4 is always attached to and wrapped on the end surface of the annular sealing boss 32 of the valve core 3, and when the end surface of the annular sealing boss 32 is separated from the surface of the soft sealing gasket 4, namely the pressure measuring joint is opened, the internal pressure of the system can push the soft sealing gasket 4 to the bottom of the semi-closed annular cavity. In the opening and closing process of the pressure measuring joint, the soft sealing gasket 4 is not subjected to destructive shearing force caused by the soft sealing in the soft sealing mechanism mentioned in the background art, so that the damage of the soft sealing is prevented, and the effectiveness of the sealing is ensured.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiments should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various improvements and modifications can be made without departing from the spirit and scope of the invention, and these improvements and modifications should also be construed as within the scope of the invention.
Claims (2)
1. A pressure measuring joint soft sealing mechanism is characterized by comprising:
the valve core is sequentially divided into a push rod part, an annular sealing boss part, a rod body part and a spring mounting step part, the push rod part is cylindrical, the rear part of the push rod is connected with the rod body, a circle of annular sealing boss is arranged on the end face of the rod body, the inner diameter of the annular sealing boss is larger than the outer diameter of the push rod, the outer diameter of the annular sealing boss is smaller than the outer diameter of the rod body, the other end of the rod body is provided with a spring mounting step, and the outer diameter of the step is smaller than the diameter of the rod body;
the valve seat is formed by a valve seat body, a soft sealing gasket, a pressing cover and a pressure measuring joint body, and the soft sealing gasket is cylindrical with an inner hole; the valve seat body is provided with external threads, the center of the valve seat body is provided with a flow passage hole, the flow passage hole is in clearance fit with the outer diameter of the valve core push rod part, the end head of the valve seat body is a small step circle, the outer diameter of the small step circle is smaller than the inner diameter of the annular sealing boss of the valve core, a sealing gasket groove is formed after the small step circle, the outer diameter of the sealing gasket groove is in tight fit with the inner diameter of the soft sealing gasket, the groove width is larger than the thickness of the soft sealing gasket, and a large step circle is formed after the sealing gasket groove; the gland is cylindrical in shape, the inner hole is divided into a large inner hole and a small inner hole through a step, the outer diameter of the large inner hole is tightly matched with the outer diameter of the soft sealing gasket and is in transition fit with a large step circle on the valve seat body, the depth of the large step hole is larger than the sum of the length of the large step circle on the valve seat body and the thickness of the soft sealing gasket, and the diameter of the small inner hole is in clearance fit with the outer diameter of the annular sealing boss of the valve core; when the soft sealing gasket is arranged in the sealing groove of the valve seat body, and the large inner hole end of the pressing cover and the large step circle on the valve seat body are pressed together, the pressing cover and the valve seat body form a cavity with an annular opening for installing the soft sealing gasket; the pressure measuring connector body is internally provided with an internal thread hole matched with the external thread on the valve seat body, and the lower end of the internal thread hole is provided with a gland blocking step;
and the compression spring is arranged on a spring installation step on the valve core and used for pushing the valve core when no pressure exists in the pressure measuring joint, and the end surface of the annular sealing boss on the valve core is attached to the top surface of the soft sealing gasket.
2. The soft sealing mechanism for the pressure tap according to claim 1, wherein: the end of the valve core pushing rod is provided with a blind hole which is connected with a radial through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120348672.7U CN215173076U (en) | 2021-02-08 | 2021-02-08 | Pressure measuring joint soft sealing mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120348672.7U CN215173076U (en) | 2021-02-08 | 2021-02-08 | Pressure measuring joint soft sealing mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215173076U true CN215173076U (en) | 2021-12-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120348672.7U Active CN215173076U (en) | 2021-02-08 | 2021-02-08 | Pressure measuring joint soft sealing mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215173076U (en) |
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2021
- 2021-02-08 CN CN202120348672.7U patent/CN215173076U/en active Active
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