CN210154344U - Tail end structure of multistage multi-stage detachable plug - Google Patents

Abstract

The utility model relates to a smelting furnace equipment technical field, concretely relates to end structure of end cap can be dismantled to multistage multiple-stage type, wherein the end structure top is for going out the liquid end, and the bottom is the feed liquor end, and end structure's play liquid end is connected with middle part connection structure when connecting, and end structure's feed liquor end is connected with smelting furnace feed liquid inlet, and end structure is inside to be provided with third infusion passageway, third infusion passageway has set gradually third drain pipe, fifth hydrops chamber, has got into feed liquid chamber, third connection chamber and entering chamber from end structure's top towards end structure's bottom. The problem of current end cap be mostly integrated into one piece's structure, and choose for use the removable end cap of multistage multiple-stage formula, do not have each adapting unit's of looks adaptation concrete structure on the market at present, if lack the structure that terminal portion is relative to, lead to the difficult multistage multiple stage design that realizes the end cap that satisfies is solved.

Description

Tail end structure of multistage multi-stage detachable plug

Technical Field

The utility model relates to a smelting furnace equipment technical field, concretely relates to end structure of end cap can be dismantled to multistage formula.

Background

When the smelting furnace of industrial equipment is used, various plug structures are needed, furnace eyes are blocked, the plugs are pulled down after the temperature is reached, smelting liquid is cast, and a liquid conveying channel is arranged in some cases, so that the liquid can be added into the smelting furnace.

Chinese patent publication No. CN203116528U discloses a plug structure, which is integrally formed, and when part of the structure is damaged, the whole plug structure needs to be replaced completely, thereby greatly increasing the overall material cost.

SUMMERY OF THE UTILITY MODEL

The utility model discloses be mostly integrated into one piece's structure to current end cap, and choose for use the end cap of dismantling of multistage multiple-stage formula, do not have each adapting unit's of looks adaptation concrete structure on the market at present, if lack the corresponding structure of terminal part, lead to the difficult problem that realizes the multistage multiple-stage design of end cap that satisfies, provide an end structure that end cap can be dismantled to multistage multiple-stage formula.

The technical scheme who adopts is, the end structure of end cap can be dismantled to multistage multiple-stage type, wherein the end structure top is for going out the liquid end, the bottom is the feed liquor end, end structure's play liquid end is connected with middle part connection structure during the connection, end structure's feed liquor end is connected with smelting furnace feed liquid inlet, the inside third infusion passageway that is provided with of end structure, third infusion passageway has set gradually third drain pipe, fifth hydrops chamber, get into the feed liquid chamber, the chamber is connected and gets into the chamber from end structure's top towards end structure's bottom.

Furthermore, the third liquid outlet pipe, the fifth liquid accumulation cavity, the feed liquid inlet cavity, the third connecting cavity and the feed inlet cavity are sequentially communicated, the third liquid outlet pipe, the fifth liquid accumulation cavity, the third connecting cavity and the feed inlet cavity are all of a cylindrical structure, and the feed liquid inlet cavity is of a circular truncated cone structure.

Optionally, the radius of the third liquid outlet pipe is smaller than the radius of the fifth liquid accumulation cavity, the radius of the third connection cavity is smaller than the radius of the inlet cavity, the small end of the inlet liquid cavity is communicated with the fifth liquid accumulation cavity, the large end of the inlet liquid cavity is communicated with the third connection cavity, and the radius of the large end of the inlet liquid cavity is equal to the radius of the third connection cavity.

Optionally, the third connecting cavity inner wall is provided with a fifth thread.

Furthermore, the tail end structure is composed of a cylindrical portion at the bottom and a second protruding portion at the top, the center line of the second protruding portion is overlapped with the center line of the cylindrical portion, a fourth thread is arranged on the periphery of the upper portion of the second protruding portion, and a second groove is arranged on the periphery of the middle portion of the second protruding portion.

Optionally, when the tail end structure is connected with the middle connecting structure, the third liquid outlet pipe is communicated with a third sealing cavity in the middle connecting structure, the fourth thread is connected with a third thread in the middle connecting structure, and the top of the fourth thread is attached to a third sealing ring in the middle connecting structure.

Optionally, a fifth sealing ring is arranged in the second groove, and the fifth sealing ring is connected with the upper wall of the fourth hydrops cavity in the middle connecting structure in a propping manner.

The utility model has the advantages that at least one of the following advantages is included;

1. the characteristics to the end cap can be dismantled to multistage multiple-stage type set up and contain the end structure that leads to by third drain pipe, fifth hydrops chamber, entering feed liquid chamber, third connection chamber and entering chamber constitution third infusion, and it is applicable to the multistage multiple-stage type can be dismantled the end cap and be connected with smelting furnace feed liquid inlet, can dismantle the design of end cap for the multistage multiple-stage type and provide good basic component and select.

2. Be equipped with the function that a plurality of cavitys have realized sealed and hydrops respectively and have kept in the third infusion passageway among the end structure, be applicable to the multistage formula end cap of demountable assembly multistage.

3. The problem of current end cap be mostly integrated into one piece's structure, and choose for use the removable end cap of multistage multiple-stage formula, do not have each adapting unit's of looks adaptation concrete structure on the market at present, if lack the corresponding structure of terminal part, lead to the difficult multistage multiple design that realizes the end cap that satisfies is solved.

Drawings

FIG. 1 is a schematic view of the internal structure of the terminal structure;

FIG. 2 is an external structural view of the terminal structure;

FIG. 3 is a schematic view of the internal structure of the middle connection structure;

FIG. 4 is an external view of a middle connection structure;

FIG. 5 is a schematic diagram of the internal structure of the front end structure;

FIG. 6 is an external view of the front end structure;

FIG. 7 is a schematic view of the external structure of the end structure of the three-segment removable plug;

FIG. 8 is a schematic structural view of the connection of the end structures of the three-segment type removable plugs;

FIG. 9 is a schematic view of the internal structure of the end structure of the three-segment removable plug;

labeled as: 1 is a front end structure, 2 is a middle connecting structure, 201 is a first protruding part, 202 is a circular table part, 3 is a tail end structure, 301 is a second protruding part, 302 is a cylindrical part, 4 is a first liquid outlet pipe, 5 is a first liquid accumulation cavity, 6 is a first sealing cavity, 7 is a second sealing cavity, 8 is a first connecting cavity, 9 is a first thread, 10 is a second liquid accumulation cavity, 11 is a wide mouth, 12 is a connector seat, 13 is a connector, 14 is a second thread, 15 is a second liquid outlet pipe, 16 is a first groove, 17 is a third liquid accumulation cavity, 18 is a third sealing cavity, 19 is a fourth sealing cavity, 20 is a second connecting cavity, 21 is a third thread, 22 is a fourth liquid accumulation cavity, 23 is a third liquid outlet pipe, 24 is a fourth thread, 25 is a second groove, 26 is a fifth liquid accumulation cavity, 27 is a feeding liquid cavity, 28 is a third connecting cavity, 29 is a fifth thread cavity, 30 is a first sealing ring, 31 is a first sealing ring, A second seal ring 32, a fourth seal ring 33, a third seal ring 34, and a fifth seal ring 35.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the scope of the invention.

As shown in fig. 1 and 2, the end structure of end cap can be dismantled to multistage multiple-stage type, wherein the 3 tops of end structure are for going out the liquid end, the bottom is the feed liquor end, end structure 3's play liquid end is connected with middle part connection structure 2 during the connection, end structure 3's feed liquor end is connected with smelting furnace feed liquid inlet, end structure 3 is inside to be provided with third infusion passageway, third infusion passageway is from end structure 3's top towards end structure 3's bottom, third drain pipe 23 has set gradually, fifth hydrops chamber 26, get into feed liquid chamber 27, third connection chamber 28 and entering chamber 30.

In the use, to the multistage formula characteristics that can dismantle the end cap, the setting contains and is become the end structure that the third infusion leads to by third drain pipe, fifth hydrops chamber, entering feed liquid chamber, third connection chamber and entering chamber, and it is applicable to the multistage formula and can dismantle the end cap and be connected with smelting furnace feed liquid inlet, can dismantle the design of end cap for the multistage formula and provide good basic component selection. The problem of current end cap be mostly integrated into one piece's structure, and choose for use the removable end cap of multistage multiple-stage formula, do not have each adapting unit's of looks adaptation concrete structure on the market at present, lead to the difficult multistage multilevel design who realizes the end cap that satisfies is solved.

In this embodiment, the third liquid outlet pipe 23, the fifth liquid accumulation cavity 26, the liquid inlet cavity 27, the third connecting cavity 28 and the liquid inlet cavity 30 are sequentially communicated, the third liquid outlet pipe 23, the fifth liquid accumulation cavity 26, the third connecting cavity 28 and the liquid inlet cavity 30 are all in a cylindrical structure, and the liquid inlet cavity 27 is in a circular truncated cone structure. The radius of the third liquid outlet pipe 23 is smaller than that of the fifth liquid accumulation cavity 26, the radius of the third connecting cavity 28 is smaller than that of the inlet cavity 30, the small end of the inlet liquid cavity 27 is communicated with the fifth liquid accumulation cavity 26, the large end of the inlet liquid cavity 27 is communicated with the third connecting cavity 28, the radius of the large end of the inlet liquid cavity 27 is equal to that of the third connecting cavity 28, and fifth threads 29 are arranged on the inner wall of the third connecting cavity 28.

In use, a plurality of cavities and tubular structures are arranged in the third liquid conveying channel, wherein the third liquid outlet pipe is used for injecting liquid into the third liquid accumulation cavity, the fifth liquid accumulation cavity is used for storing the liquid in the third liquid outlet pipe, a fifth thread 29 is arranged in the third connecting cavity and is connected with the liquid inlet of the smelting furnace through the fifth thread 29, when the liquid enters the liquid inlet cavity of the third liquid conveying pipeline from the liquid inlet of the smelting furnace, the liquid enters the liquid inlet cavity smoothly through flow guide due to the fact that the liquid inlet cavity is of a circular truncated cone structure, and the liquid enters the cavity conveniently to be inserted into the liquid inlet of the smelting furnace.

In this embodiment, the end structure 3 is composed of a cylindrical portion 302 at the bottom and a second protrusion 301 at the top, the center line of the second protrusion 301 coincides with the center line of the cylindrical portion 302, the upper outer periphery of the second protrusion 301 is provided with the fourth thread 24, and the middle outer periphery of the second protrusion 301 is provided with the second groove 25. When the end structure 3 is connected with the middle connecting structure 2, the third liquid outlet pipe 23 is communicated with the third sealing cavity 18 in the middle connecting structure 2, the fourth thread 24 is connected with the third thread 21 in the middle connecting structure 2, and the top of the fourth thread 24 is attached to the third sealing ring 34 in the middle connecting structure 2. A fifth sealing ring 35 is arranged in the second groove 25, and the fifth sealing ring 35 is connected with the upper wall of the fourth hydropneumatic chamber 22 in the middle connecting structure 2 in a propping manner.

In the use, set up the second recess in the periphery of second bulge to pack the fifth sealing washer in the recess, when setting up each cavity size, make before end structure and middle part connection structure be connected fixed back, the top of fifth sealing washer and fourth hydrops chamber upper wall connects, thereby can prevent to get into the second from the fourth seal chamber behind the feed liquid passing third sealing washer and connect the chamber, also can prevent simultaneously that the liquid that fills from getting into the third hydrops chamber in the fourth hydrops chamber.

It should be noted that "multiple segments" in the present application refers to a specific component of the entire plug, and if two segments are used, it means that the plug is composed of a front end structure and a tail end structure, and if three segments are used, it means that the plug is composed of a front end structure, a middle connecting structure and a tail end structure; the term "multistage" refers to the number of middle connecting structures in a plug, for example, a "two-stage zero-order plug" can be regarded as a "two-stage zero-order plug", a plug composed of a front end structure, one middle connecting structure, and a tail end structure can be regarded as a "three-stage one-order plug", and a plug composed of a front end structure, two middle connecting structures, and a tail end structure can be regarded as a "three-stage two-order plug" and so on.

As shown in fig. 3 to 9, in this embodiment, for convenience of understanding, the multi-stage detachable plug is exemplified as a three-stage detachable plug, and a middle connection structure and a front end structure which are used in coordination with a terminal structure are disclosed, the three-stage detachable plug includes a plug body, wherein the plug body includes a front end structure 1, a middle connection structure 2 and a terminal structure 3, the bottom of the front end structure 1 is detachably connected with the top of the middle connection structure 2, and the bottom of the middle connection structure 2 is detachably connected with the top of the terminal structure 3; a first infusion channel is arranged in the front end structure 1, one end opening of the first infusion channel is positioned at the bottom of the front end structure 1, and the other end opening of the first infusion channel is positioned at the top of the front end structure 1; a second infusion channel is arranged in the middle connecting structure 2, one end of the second infusion channel is opened at the bottom of the middle connecting structure 2, the other end of the second infusion channel is opened at the top of the middle connecting structure 2, and when the middle connecting structure 2 is connected with the front end structure 1, the first infusion channel is communicated with the second infusion channel; the inside third infusion passageway that is provided with of end structure 3, third infusion passageway one end opening is located end structure 3's bottom, and other end opening is located end structure 3's top, and when middle part connection structure 2 was connected with end structure 3, second infusion passageway and third infusion passageway intercommunication.

In the use, the three-section detachable plug formed by combining the front end structure, the middle connecting structure and the tail end structure is arranged, when the problems of damage or poor sealing and the like occur to the front end structure, the middle connecting structure and the tail end structure, corresponding parts can be detached and replaced, so that the whole plug is prevented from being replaced, and the material replacement cost is greatly reduced. Compared with a two-section detachable plug, the replaceable component is more, so that the replaceable plug can deal with various smelting furnace environments. The problem of current end cap mostly be integrated into one piece's structure, need carry out whole changes with whole end cap structure when partial structure appears damaging, improve whole material cost by a wide margin is solved.

In this embodiment, the first liquid conveying channel is provided with a first liquid outlet pipe 4, a first dropsy cavity 5, a first sealing cavity 6, a second sealing cavity 7, a first connecting cavity 8 and a second dropsy cavity 10 in sequence from the top of the front end structure 1 to the bottom of the front end structure 1, and the first liquid outlet pipe 4, the first dropsy cavity 5, the first sealing cavity 6, the second sealing cavity 7, the first connecting cavity 8 and the second dropsy cavity 10 are all cylindrical structures. The radius of first seal chamber 6 is greater than the radius of first hydrops chamber 5, and the radius of first seal chamber 6 is less than the radius of second seal chamber 7, is provided with first sealing washer 31 in the first seal chamber 6, is provided with second sealing washer 32 in the second seal chamber 7, and the inside of first connection chamber 8 is provided with first screw thread 9.

In use, be provided with a plurality of cavitys and tubular structure in first infusion passageway, wherein first drain pipe is used for discharging the feed liquid, first hydrops chamber is used for filling the feed liquid, first sealed chamber and second sealed chamber are used for sealing middle part connection structure's first bulge, make first bulge exhaust feed liquid can get into first hydrops chamber smoothly, be provided with first screw thread on the first connection chamber, it realizes being connected with first bulge to make it through threaded connection's mode, it is used for stabilizing the hydraulic liquid of first hydrops intracavity to fill in the second hydrops chamber, can choose water and other stable reagent for use, when front end structure and middle part connection structure are connected completely, both zonulae occludens.

When unusual or damaged appearing, can take off front end structure or middle part connection structure to replace, solved current end cap and mostly be integrated into one piece's structure, need carry out whole changes with whole end cap structure when partial structure appears damaging, improve the problem of whole material cost by a wide margin.

In this embodiment, the second liquid conveying channel is sequentially provided with a second liquid outlet pipe 15, a third liquid accumulation cavity 17, a third sealing cavity 18, a fourth sealing cavity 19, a second connecting cavity 20 and a fourth liquid accumulation cavity 22 from the top of the middle connecting structure 2 to the bottom of the middle connecting structure 2, and the second liquid outlet pipe 15, the third liquid accumulation cavity 17, the third sealing cavity 18, the fourth sealing cavity 19, the second connecting cavity 20 and the fourth liquid accumulation cavity 22 are all cylindrical structures. The radius of the third sealing cavity 18 is larger than that of the third dropsy cavity 17, the radius of the third sealing cavity 18 is smaller than that of the fourth sealing cavity 19, a third sealing ring 34 is arranged in the fourth sealing cavity 19, and a third thread 21 is arranged in the second connecting cavity 20.

In use, be provided with a plurality of cavitys and tubular structure in the second infusion passageway, wherein the second drain pipe is arranged in pouring into the first hydrops chamber with the feed liquid, the third hydrops chamber is then kept in to the feed liquid in the second drain pipe, the size in third sealed chamber is less than fourth sealed chamber, treat that the second bulge inserts behind the second connection chamber, the top is blockked outside the third sealed chamber, it is used for stabilizing the hydraulic liquid of third hydrops intracavity to fill in the fourth hydrops chamber, can choose for use water and other stable reagent, when front end structure and middle part connection structure are connected completely, both zonulae occludens, when middle part connection structure is connected with end structure, both zonulae occludens.

In this embodiment, the third liquid conveying channel is sequentially provided with a third liquid outlet pipe 23, a fifth liquid accumulation cavity 26, an entering liquid cavity 27, a third connecting cavity 28 and an entering cavity 30 from the top of the end structure 3 toward the bottom of the end structure 3, the third liquid outlet pipe 23, the fifth liquid accumulation cavity 26, the third connecting cavity 28 and the entering cavity 30 are all cylindrical structures, and the entering liquid cavity 27 is a circular truncated cone structure. The center line of the plug body along the axial direction passes through the centers of the first liquid conveying channel, the second liquid conveying channel and the third liquid conveying channel.

In use, a plurality of cavities and tubular structures are arranged in the third liquid conveying channel, wherein the third liquid outlet pipe is used for injecting liquid into the third liquid accumulation cavity, the fifth liquid accumulation cavity is used for storing the liquid in the third liquid outlet pipe, a fifth thread 29 is arranged in the third connecting cavity and is connected with the liquid inlet of the smelting furnace through the fifth thread 29, when the liquid enters the liquid inlet cavity of the third liquid conveying pipeline from the liquid inlet of the smelting furnace, the liquid enters the liquid inlet cavity smoothly through flow guide due to the fact that the liquid inlet cavity is of a circular truncated cone structure, and the liquid enters the cavity conveniently to be inserted into the liquid inlet of the smelting furnace.

In this embodiment, the top of the front-end structure 1 is a segment structure; the middle connecting structure 2 consists of a circular truncated cone part 202 at the bottom and a first bulge part 201 at the top, the central line of the first bulge part 201 is overlapped with the central line of the circular truncated cone part 202, the periphery of the upper part of the first bulge part 201 is provided with a second thread 14, and the periphery of the middle part of the first bulge part 201 is provided with a first groove 16; the end structure 3 is composed of a cylindrical part 302 at the bottom and a second bulge 301 at the top, the central line of the second bulge 301 is coincident with the central line of the cylindrical part 302, the upper periphery of the second bulge 301 is provided with a fourth thread 24, and the middle periphery of the second bulge 301 is provided with a second groove 25. When the front end structure 1 is connected with the middle connecting structure 2, after the first bulge 201 sequentially passes through the second dropsy cavity 10, the first connecting cavity 8, the second sealing cavity 7 and the first sealing cavity 6, the top of the first bulge 201 is attached to the inner wall of the first dropsy cavity 5, the first threads 9 are connected with the second threads 14, and the first sealing ring 31 and the second sealing ring 32 are attached to the second threads 14; when middle part connection structure 2 is connected with end structure 3, second bulge 301 passes fourth hydrops chamber 22, second connection chamber 20 and fourth seal chamber 19 back in proper order, and third drain pipe 23 and third seal chamber 18 intercommunication, third screw thread 21 and fourth screw thread 24 are connected, and third sealing washer 34 and the laminating of fourth screw thread 24. A fourth sealing ring 33 is arranged in the first groove 16, the fourth sealing ring 33 is connected with the upper wall of the second dropsy cavity 10 in a jacking mode, a fifth sealing ring 35 is arranged in the second groove 25, and the fifth sealing ring 35 is connected with the upper wall of the fourth dropsy cavity 22 in a jacking mode.

In use, the end part of the first protruding part is provided with a connector base 12 and a connector 13, the size of the connector base 12 is matched with that of the first liquid accumulation cavity, the connector base can be directly inserted into the first liquid accumulation cavity, and the connector 13 is positioned at the end part of the connector base 12 and used for guiding liquid.

Meanwhile, the lower part of the second dropsy cavity is also provided with a widening port 11 communicated with the second dropsy cavity, the widening port 11 is of a circular truncated cone structure, the small end of the widening port is communicated with the second dropsy cavity, the first protruding part can be conveniently inserted into the first infusion channel, and meanwhile, the abrasion of the first protruding part to the opening of the second dropsy cavity is reduced.

Then, a first groove is arranged on the periphery of the first bulge, a fourth sealing ring is filled in the groove, when the sizes of the cavities are set, after the front end structure and the middle connecting structure are connected and fixed, the fourth sealing ring is abutted with the upper wall of the second hydrops cavity, thereby preventing the feed liquid from entering the second dropsy cavity from the first connecting cavity after passing through the first sealing ring and the second sealing ring, and simultaneously preventing the liquid filled in the second dropsy cavity from entering the first connecting cavity, a second groove is arranged on the periphery of the second bulge, a fifth sealing ring is filled in the groove, and when the sizes of the cavities are set, after the front end structure and the middle connecting structure are connected and fixed, the fifth sealing ring is connected with the upper wall of the fourth hydrops cavity in a jacking way, thereby can prevent to get into the second from the fourth seal chamber behind the feed liquid passes the third sealing washer and connect the chamber, also can prevent simultaneously that the liquid that fills in the fourth hydrops chamber from getting into the third hydrops chamber.

The whole plug body is made of hard alloy.

It should be mentioned that, a person skilled in the art can design the actual size of each cavity by himself or herself when aiming at different smelting furnace devices, so that only the size relationship among the cavities is described here, and detailed description of the specific size is omitted.

Claims (7)

1. The end structure of end cap can be dismantled to multistage formula, end structure (3) top is for going out the liquid end, and the bottom is the feed liquor end, and the play liquid end of end structure (3) is connected with middle part connection structure (2) during the connection, and the feed liquor end of end structure (3) is connected its characterized in that with smelting furnace feed liquid inlet: the third liquid conveying channel is arranged inside the tail end structure (3), and a third liquid outlet pipe (23), a fifth liquid accumulation cavity (26), an entering liquid cavity (27), a third connecting cavity (28) and an entering cavity (30) are sequentially arranged on the third liquid conveying channel from the top of the tail end structure (3) to the bottom of the tail end structure (3).

2. The end structure of a multistage and multistage removable plug according to claim 1, wherein: third drain pipe (23), fifth hydrops chamber (26), entering feed liquid chamber (27), third are connected chamber (28) and are got into chamber (30) and communicate in proper order, and third drain pipe (23), fifth hydrops chamber (26), third are connected chamber (28) and are got into chamber (30) and are the cylinder structure, it is the round platform structure to advance into feed liquid chamber (27).

3. The end structure of a multistage and multistage removable plug according to claim 2, wherein: the radius of third drain pipe (23) is less than the radius of fifth hydrops chamber (26), the radius that chamber (28) was connected to the third is less than the radius that gets into chamber (30), it communicates with fifth hydrops chamber (26) to advance the material feeding chamber (27) stub end, advances material feeding chamber (27) stub end and third and is connected chamber (28) intercommunication, and advances material feeding chamber (27) stub end radius and third and be connected chamber (28) radius and equal.

4. The end structure of a multistage and multistage removable plug according to claim 3, wherein: and a fifth thread (29) is arranged on the inner wall of the third connecting cavity (28).

5. The end structure of a multistage and multistage removable plug according to claim 3, wherein: the tail end structure (3) is composed of a cylindrical portion (302) at the bottom and a second protruding portion (301) at the top, the center line of the second protruding portion (301) is overlapped with the center line of the cylindrical portion (302), a fourth thread (24) is arranged on the periphery of the upper portion of the second protruding portion (301), and a second groove (25) is arranged on the periphery of the middle portion of the second protruding portion (301).

6. The end structure of a multistage and multistage removable plug according to claim 5, wherein: when end structure (3) is connected with middle part connection structure (2), third sealed chamber (18) intercommunication in third drain pipe (23) and middle part connection structure (2), fourth screw thread (24) are connected with third screw thread (21) in middle part connection structure (2), and third sealing washer (34) laminating in fourth screw thread (24) top and middle part connection structure (2).

7. The end structure of a multistage removable plug according to claim 6, wherein: and a fifth sealing ring (35) is arranged in the second groove (25), and the fifth sealing ring (35) is in abutting joint with the upper wall of a fourth hydrops cavity (22) in the middle connecting structure (2).

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