CN214118938U

CN214118938U - SF6 gas density meter shell sealing structure

Info

Publication number: CN214118938U
Application number: CN202023162338.7U
Authority: CN
Inventors: 李军
Original assignee: Wuxi Kaifeng Electric Technology Co ltd
Current assignee: Wuxi Kaifeng Electric Technology Co ltd
Priority date: 2020-12-24
Filing date: 2020-12-24
Publication date: 2021-09-03
Anticipated expiration: 2030-12-24

Abstract

The utility model relates to a SF6 gas density meter sealing technical field, concretely relates to SF6 gas density meter casing seal structure, including the watchcase, the circumference wall of watchcase is equipped with the lug, set up threaded hole on the lug, through the setting up of threaded hole, make outside atmospheric pressure link up with the watchcase inner chamber; the threaded hole is in threaded connection with an air seal screw, and a gap between the air seal screw and the threaded hole is sealed through a sealing structure; the gas seal screw comprises a thread locking column and an end head arranged at the end part of the thread locking column; the sealing structure comprises a first sealing structure and a second sealing structure; the problem of seal structure mostly through the form of single sealing washer or combination packing ring, because single sealing washer sealing performance is poor, combination packing ring purchasing cost is high, and delivery cycle is long, all produces certain influence to product material cost control, material purchasing and product production cycle is solved.

Description

SF6 gas density meter shell sealing structure

Technical Field

The utility model relates to a SF6 gas density table seals technical field, concretely relates to SF6 gas density table shell seal structure.

Background

In the industrial field, daily work field and other fields, various meters with shells filled with liquid (such as vibration-proof oil) or gas (such as sulfur hexafluoride gas, nitrogen and air) are widely used, such as vibration-proof oil-filled pressure gauges widely applied in the departments of electric power, chemical industry, metallurgy, water supply and the like, such as absolute pressure type sulfur hexafluoride density gauges, oil-filled electrical contact pressure gauges, oil-filled sulfur hexafluoride gas density relays and the like widely applied in electric power systems.

In the prior art, the SF6 gas density meter usually includes a gas seal screw, which is fixed on the chassis or the housing through a sealing member, so as to not only provide better sealing function, but also ensure that the sealed air pressure inside the housing is atmospheric pressure (generally standard atmospheric pressure). Because no air seal screw is arranged, when the shell and the chassis are sealed and fixed together, the internal air pressure is extruded, which is not the local standard atmospheric pressure of the seal, and the meter is inaccurate. The phenomenon can not happen under the action of the air seal screw, the air seal screw is sealed after the shell and the chassis are fixed together in a sealing mode, the occupied volume is very small due to the small air seal screw, and the air pressure in the air seal screw cannot change.

However, when the gas seal screw in the prior art is used for sealing with the housing of the SF6 gas density meter, the adopted sealing structure is mostly in the form of a single sealing ring or a combined gasket, and because the single sealing ring has poor sealing performance, the combined gasket has high purchase cost and long delivery period, and certain influence is exerted on product material cost control, material purchase and product production period, the development of the sealing structure of the housing of the SF6 gas density meter is urgently needed to solve the problems.

SUMMERY OF THE UTILITY MODEL

The utility model provides a not enough to prior art, the utility model provides a SF6 gas density table shell body seal structure has solved the most form through single sealing washer or combination packing ring of seal structure, because single sealing washer sealing performance is poor, combination packing ring purchasing cost is high, and delivery cycle length is long, all produces the problem of certain influence to product material cost control, material purchase and product production cycle.

The utility model discloses a following technical scheme realizes:

a sealing structure of a housing of an SF6 gas density meter comprises a meter housing, wherein a convex block is arranged on the circumferential wall of the meter housing, a threaded hole is formed in the convex block, and the external atmospheric pressure is communicated with the inner cavity of the meter housing through the threaded hole;

the threaded hole is in threaded connection with an air seal screw, and a gap between the air seal screw and the threaded hole is sealed through a sealing structure; the gas seal screw comprises a thread locking column and an end head arranged at the end part of the thread locking column;

the sealing structure comprises a first sealing structure and a second sealing structure; the first sealing structure comprises an annular sealing groove, a protruding strip and an O-shaped sealing ring; the annular sealing groove is formed in the bottom of the end head and located on the outer side of the thread locking column, the O-shaped sealing ring is embedded in the annular sealing groove, and the O-shaped sealing ring is further pressed and locked through the protruding strips arranged on the inner wall and the outer wall of the annular sealing groove in a staggered mode; the second seal structure includes locating sleeve and seal cushion, locating sleeve set up in the top of lug, and be located the outside of screw thread locking post, through set up on locating sleeve's the inner wall seal cushion will the clearance between end and the locating sleeve is sealed.

Preferably, the cross section of the lug is of a square structure, and the lug and the watch case are of an integrally formed structure.

Preferably, the cross section of each protruding strip is of a hemispherical structure, the number of the protruding strips circumferentially arranged on the inner wall of the annular sealing groove is at least six, and the number of the protruding strips circumferentially arranged on the outer wall is at least twelve.

Preferably, the O-shaped sealing ring and the sealing cushion layer are made of polytetrafluoroethylene sealing ring materials.

Preferably, the gas seal screw is made of stainless steel with a titanium alloy coating plated on the surface, and the top of the end part further comprises a hexagonal socket wrench hole.

Preferably, when the air seal screw is screwed into the threaded hole, the air seal screw further comprises a silicone layer coated on the top surface of the projection, the exposed bottom surface of the O-ring, the inner wall surface of the seal cushion layer and the circumferential wall surface of the tip.

The utility model has the advantages that:

the utility model adopts the design and the use of the components, solves the problems that the sealing structure mostly adopts the form of a single sealing ring or a combined gasket, and the single sealing ring has poor sealing performance, high purchasing cost of the combined gasket and long delivery period, and has certain influence on the cost control of product materials, the purchasing of materials and the production period of products;

meanwhile, the sealing effect of the assembly connection between the watchcase and the gas seal screw is further improved through the arrangement of the first sealing structure, the second sealing structure and the coating silicone layer;

and the utility model has the advantages of novel structure, reasonable design, convenient use and stronger practicability.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a top exploded view of the present invention;

FIG. 2 is a bottom exploded view of the present invention;

fig. 3 is a schematic structural view of a second sealing structure of the present invention;

fig. 4 is a schematic perspective view of a first sealing structure of the present invention;

fig. 5 is a schematic bottom view of the first sealing structure of the present invention.

In the figure: the sealing structure comprises a watchcase 1, a lug 2, a threaded hole 3, a gas seal screw 4, a threaded locking column 41, a head 42, a first sealing structure 5, an annular sealing groove 501, a protruding strip 502, an O-shaped sealing ring 503, a second sealing structure 6, a positioning sleeve 601, a sealing cushion 602 and a hexagonal sleeve wrench hole 7.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The first embodiment is as follows:

please refer to fig. 1-5: the utility model particularly provides a SF6 gas density meter casing seal structure, including watchcase 1, the circumference wall of watchcase 1 is equipped with lug 2, has seted up screw hole 3 on lug 2, through the setup of screw hole 3, makes outside atmospheric pressure link up with watchcase 1 inner chamber; the threaded hole 3 is in threaded connection with an air seal screw 4, and a gap between the air seal screw 4 and the threaded hole 3 is sealed through a sealing structure; the air seal screw 4 comprises a thread locking column 41 and a head 42 arranged at the end part of the thread locking column 41; the gas seal screw 4 can be screwed into the threaded hole 3 by using the thread locking force between the thread locking column 41 and the threaded hole 3, and meanwhile, the inside and the outside of the watchcase 1 are isolated and sealed by the arrangement of a sealing structure;

further, the seal structure includes a first seal structure 5 and a second seal structure 6; the first sealing structure 5 comprises an annular sealing groove 501, a protruding strip 502 and an O-shaped sealing ring 503; an annular sealing groove 501 is formed in the bottom of the end 42 and located on the outer side of the thread locking column 41, and an O-shaped sealing ring 503 is embedded in the annular sealing groove 501, so that the purpose of primary isolation and sealing between the inside and the outside of the watchcase 1 is achieved; before the O-shaped sealing ring 503 is embedded and assembled, firstly, the inside of the annular sealing groove 501 and the O-shaped sealing ring 503 are cleaned and assembled in an air blowing mode, so that dust remained in the annular sealing groove 501 or on the O-shaped sealing ring 503 is prevented from entering the inside of the watchcase 1 when being assembled with the watchcase 1, the O-shaped sealing ring 503 is further pressed and locked through the protruding strips 502 arranged on the inner wall and the outer wall of the annular sealing groove 501 in a staggered mode, the integral interference assembly effect of the O-shaped sealing ring 503 and the annular sealing groove 501 is further improved, the anti-falling phenomenon is avoided, meanwhile, the gap between the O-shaped sealing ring 503 and the annular sealing groove 501 is further reduced through further pressing and locking, and the sealing effect of the O-shaped sealing ring 503 is further improved; second seal structure 6 includes position sleeve 601 and seal cushion layer 602, position sleeve 601 sets up in the top of lug 2, and be located the outside of screw thread locking post 41, seal cushion layer 602 through setting up on position sleeve 601's the inner wall, seal the clearance between end 42 and position sleeve 601, not only reach and carry out the isolated sealed purpose of secondary to making watchcase 1 inside and outside, utilize the elastic damping locking force between seal cushion layer 602 and the end 42 simultaneously, can further improve the locking effect of gas seal screw 4 when assembling with screw hole 3, avoid SF6 gas density meter production vibrations when operation to cause the pine phenomenon of gas seal screw 4.

Specifically, the cross section of the lug 2 is of a square structure, and the lug 2 and the watchcase 1 are of an integrally formed structure, so that the overall structural strength of the watchcase 1 and the lug 2 is further enhanced.

Specifically, the cross section of the protruding strips 502 is arranged in a hemispherical structure, the number of the protruding strips 502 circumferentially arranged on the inner wall of the annular sealing groove 501 is at least six, and the number of the protruding strips 502 circumferentially arranged on the outer wall is at least twelve, so that the press-fit locking assembly sealing effect of the O-shaped sealing ring 503 and the annular sealing groove 501 is further improved.

Specifically, the O-ring 503 and the seal pad layer 602 are made of teflon seal ring materials, so that the corrosion resistance and high temperature resistance service life of the O-ring is further improved.

Specifically, the gas seal screw 4 is made of stainless steel materials with titanium alloy coatings plated on the surfaces, the corrosion-resistant service life of the gas seal screw 4 is further prolonged, the top of the end portion further comprises a hexagonal socket wrench hole 7, and the gas seal screw 4 is conveniently screwed by a hexagonal socket wrench in a uniform force mode.

Specifically, when the air seal screw 4 is screwed into the threaded hole 3, the air seal screw further includes a silicone layer coated on the top surface of the projection 2, the exposed bottom surface of the O-ring 503, the inner wall surface of the seal pad 602 and the circumferential wall surface of the tip 42, and further, the silicone layer is distributed at a plurality of positions, so that the effect of isolating and sealing the inside and the outside of the watch case 1 for a plurality of times is enhanced.

meanwhile, the sealing effect of the watchcase 1 and the gas seal screw 4 during assembling connection is further improved through the arrangement of the first sealing structure 5, the second sealing structure 6 and the coating silicone layer.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A sealing structure of a housing of an SF6 gas density meter comprises a meter housing (1), and is characterized in that a convex block (2) is arranged on the circumferential wall of the meter housing (1), a threaded hole (3) is formed in the convex block (2), and the external atmospheric pressure is communicated with the inner cavity of the meter housing (1) through the opening of the threaded hole (3);

the threaded hole (3) is in threaded connection with an air seal screw (4), and a gap between the air seal screw (4) and the threaded hole (3) is sealed through a sealing structure; the air seal screw (4) comprises a thread locking column (41) and a head (42) arranged at the end part of the thread locking column (41);

the sealing structure comprises a first sealing structure (5) and a second sealing structure (6); the first sealing structure (5) comprises an annular sealing groove (501), a protruding strip (502) and an O-shaped sealing ring (503); the annular sealing groove (501) is formed in the bottom of the end head (42) and located on the outer side of the thread locking column (41), the O-shaped sealing ring (503) is embedded in the annular sealing groove (501), and the O-shaped sealing ring (503) is further pressed and locked through the protruding strips (502) which are arranged on the inner wall and the outer wall of the annular sealing groove (501) in a staggered mode; second seal structure (6) are including position sleeve (601) and seal cushion layer (602), position sleeve (601) set up in the top of lug (2) and be located the outside of screw locking post (41), through set up on the inner wall of position sleeve (601) seal cushion layer (602), will the clearance between end (42) and position sleeve (601) is sealed.

2. An SF6 gas density meter casing sealing structure according to claim 1, wherein the lug (2) is provided in a square configuration in cross section and the lug (2) is provided in an integral formation with the watch case (1).

3. The SF6 gas density meter housing seal structure of claim 1, wherein said raised strips (502) are arranged in a hemispherical configuration in cross-section and wherein said annular seal groove (501) has an inner wall having at least six circumferentially disposed raised strips (502) and an outer wall having at least twelve circumferentially disposed raised strips (502).

4. The SF6 gas density meter housing seal arrangement of claim 1, wherein said O-ring (503) and said gasket layer (602) are both PTFE gasket material.

5. The SF6 gas density meter housing seal structure of claim 1, wherein said gas seal screw (4) is made of stainless steel material coated with titanium alloy and the top of said end portion further includes a hexagonal socket wrench hole (7).

6. An SF6 gas density meter housing sealing structure according to claim 1, wherein, when screwing the gas seal screw (4) into the threaded hole (3), a silicone layer is coated on the top surface of the projection (2), the exposed bottom surface of the O-ring (503), the inner wall surface of the seal cushion layer (602) and the circumferential wall surface of the tip (42).