CN113251666A - Universal wall-mounted furnace filter - Google Patents

Abstract

The invention provides a universal wall-mounted furnace filter, and belongs to the technical field of filters. It has solved the relatively poor problem of security of current universal filter. This filter includes casing and three way connection, is equipped with filter element group spare in the casing, has just to the water end of crossing of filter element group spare on the casing, and the three way connection is connected and is served and have the orientation in the three way connection and cross the inner tube that the water was served and extend, and the three way connection is with crossing water end circumference sealed, and the inner tube stretches into in the water end and is equipped with axially fixed's joint structure between the inner wall of inner tube and casing. This design is hidden in the end of crossing water through the fixed position between three way connection and the casing and lets the external unable contact, so do not have the possibility that the artificial accident was opened for the security of this filter obtains promoting.

Description

Universal wall-mounted furnace filter

Technical Field

The invention belongs to the technical field of filters, relates to a filter, and particularly relates to a filter of a universal wall-mounted boiler.

Background

The wall-mounted boiler and the boiler are indispensable elements in a heating system, and the wall-mounted boiler and the boiler are mainly used for heating cooled circulating water and then circulating the heated circulating water into a circulating system. Rivers often can carry certain metallic impurity after the pipeline mesocycle in heating system, especially in the ageing pipeline of the longer facility of some service lives, have impurity such as iron fillings to get into water circulating system very easily, such impurity follows the circulation and probably causes the hanging stove to damage when entering into hanging stove or boiler. Therefore all can be connected with the filter in the front end of hanging stove among the general heating system, the effect of filter can adsorb the metallic impurity of circulating water, effectually protects the hanging stove.

Filters generally have two types: one is a common type which is suitable for a circulating system with larger installation space, a shell of the filter is provided with a water inlet end and a water outlet end which are oppositely arranged, a filter element and a magnetic rod are arranged between the water inlet end and the water outlet end, metal impurities of the magnetic rod flowing in and passing through the middle can be adsorbed on the magnetic rod, the magnetic rod is taken down when the cleaning is needed, the metal is left in the filter and then washed out and cleaned through backwashing, and the operation is very convenient; the other is that the universal type is suitable for the environment with narrow installation space, only one water passing end on the filter, namely the water inlet end and the water outlet end pass through the water passing end, the magnetic rod and the filter element in the filter are the same as the common filter element, the water passing end is aligned with the filter element and the magnetic rod, the difference is that the water passing end is connected with a three-way adapter which comprises a water inlet head, a water outlet head and a connector, the water outlet head is communicated with the connector, an inner pipe is arranged in the connector, the inner pipe is communicated with the water inlet head, the water inlet head is not communicated with the connector and the water outlet head, like this when the intake head intakes the water the inner tube can be towards bar magnet and filter core direction water spray, and the impurity of aquatic can be adsorbed on the bar magnet, and rivers can enter into in the play hydrohead and discharge from the passageway between connector and the inner tube after filter inner chamber inner loop, and three way connection head can also carry out universal rotation and adjust the mounted position in order to adapt to various installation environment.

But the three way connection head of current universal filter is generally all through nut threaded connection on the filter, and three way connection head makes the nut not hard up very easily in universal pivoted and causes to leak, and the filter generally all is the liquid of filtering boiler high pressure high temperature, and the liquid that the filter leaked can cause very big potential safety hazard, for example splash to the human body and cause the firing scald. And because the screw cap that is used for locking three-way adapter and universal filter exposes outside, it is very easy to be opened by the artificial unexpected rotation and causes the connection position to loosen and reveal the highly compressed hot water of high temperature, and the potential safety hazard is huge.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a universal wall-mounted furnace filter. It is that the relatively poor technical problem of security of current universal filter is solved.

The purpose of the invention can be realized by the following technical scheme:

the utility model provides an universal hanging stove filter, includes casing and three way connection, be equipped with filter element group spare in the casing, just to the water end of crossing of filter element group spare has on the casing, the tee junction head is connected and is had the orientation in the tee junction head and cross the inner tube that water extends in the water end, a serial communication port, the tee junction head is with crossing water end circumference sealed, the inner tube stretches into in the water end and is equipped with axially fixed's joint structure between the inner wall of inner tube and casing.

Because inner tube and three way connection are integrated into one piece so this design sets up on the inner tube through the fixed position between three way connection and the casing, and concrete structure is that the inner tube restricts axial motion through the joint structure in the casing promptly three way connection and casing accomplish fixedly, because the inner tube stretches into in the water end and is equivalent to hiding the unable contact in the external world in the water end, so do not have the possibility that the people was opened by accident, so make the security of this filter obtain promoting.

And the structure of the screw thread that the joint structure compares can not take place to carry the nut to rotate together and lead to not hard up the condition when three way connection rotates, and the stability of joint structure is better, further improvement the security of this filter. After the three-way joint is installed, if the three-way joint needs to be detached again, the upper half part and the lower half part of the shell need to be detached by opening the shell, the upper half part and the lower half part of the shell extend into the inner cavity of the shell, the clamping structure is disassembled, and therefore the three-way joint can be taken down.

In foretell universal hanging stove filter, three way connection's one end stretches into in the end of crossing water and with the inside wall circumference seal of crossing the water end, three way connection is last to be equipped with and to cross the cyclic annular convex part that the water end formed the fender.

This three way connection's one end stretches into in the end of crossing water and with the inside wall circumference of crossing the water end sealed, design like this with three way connection and the sealed position of crossing the water end also moved to cross the water and served in, can't touch sealed position outside the filter, design fine like this hidden three way connection and crossed the sealed position between the water end, effectually prevented that the artificial destruction from causing the leakage, further improvement the security.

In foretell universal hanging stove filter, the joint structure is protruding including being located the inboard annular of end of intaking, the end fixing that the inner tube passed annular arch and inner tube has the jump ring, the jump ring can form with the annular arch and keep out the restriction inner tube and go out water end export direction motion.

The annular bulge is located the end inboard of intaking, and the inner tube passes the annular bulge and forms the fender with it through the jump ring that the tip set up, and this design is through hiding the joint structure in the end of intaking, in case tee bend accomplishes the installation and just can't find the fixed point between tee bend and the casing from the outside, design the security of this filter in the use by a wide margin like this. And after angle and position have been adjusted at three way connection, water pressure can make jump ring and cyclic annular arch support to lean on inseparabler when passing through high-pressure liquid in the filter, increases the frictional force between jump ring and the cyclic annular arch, and the effectual filter that prevents is rotated by the people and is changed pipeline butt joint direction and leave the potential safety hazard in the use three way connection, further improvement this universal filter's security.

The installation position of jump ring is located the bellied medial surface department of annular and is more close the inner chamber of casing, can't touch the jump ring from the external world at all, wants to dismantle three way connection just must remove the block between jump ring and the annular arch earlier, can only follow the inside of casing and unblock, so the security and the joint strength that three way connection connects on the casing are all high.

In foretell universal hanging stove filter, the joint structure is equipped with in the casing and is annular draw-in groove including the several jack catch that is located the inner tube tip, the inner tube passes through the jack catch card and goes into the restriction inner tube towards play water end export direction motion in the draw-in groove.

The clamping structure is a clamping jaw and a clamping groove, the inner pipe can play the same limiting role in the annular clamping groove through the clamping jaw, the clamping jaws are uniformly distributed at the port of the inner pipe and then in the clamping groove through the clamping jaw, and the clamping jaw can also rotate around the central line of the clamping groove in the clamping groove when the inner pipe rotates due to the fact that the clamping groove is of the annular structure, so that the technical effect the same as that of the scheme can be achieved.

In foretell universal hanging stove filter, inner tube and annular bulge clearance fit, set up a plurality of evenly distributed's the water hole of crossing on the annular bulge.

Inner tube and the protruding clearance fit of annular, design like this can effectually prevent that the inner tube from taking place the tremble when crossing water, and annular is protruding not only to play the effect of keeping out with the jump ring and can also play the effect of location inner tube and play the support to the side direction of inner tube, has improved the fixed strength of inner tube, also further increase the fail safe nature of filter.

In foretell universal hanging stove filter, the annular has been seted up on the outer peripheral face of inner tube tip, the jump ring card is established in the annular and the outside portion of jump ring exposes outside the annular, the external diameter of jump ring is greater than the bellied internal diameter of annular.

The inner side of the clamp spring is clamped in the annular groove, and the clamp spring exposed outside the annular groove and the annular bulge form a block, so that the clamp spring is simple in design structure and convenient to install.

In foretell universal hanging stove filter, at least one sealing washer is inlayed on the outer peripheral face that three way connection stretched into water end inner end one end, the sealing washer supports with the inner wall of crossing the water end and leans on to form sealedly. In foretell universal hanging stove filter, filter element group spare includes filter screen and bar magnet, the filter screen is the columnar structure of fretwork and filter screen central point puts and has the mounting hole, the bar magnet is located the mounting hole.

This filter element group spare includes filter screen and bar magnet, and the filter screen can intercept impurity, and the bar magnet can adsorb impurity, and both combine the effect to pull out the crowd, the effectual filterable effect that has improved this filter.

In foretell universal hanging stove filter, set up on the casing with the mounting hole just right installation end, the bar magnet includes shell and magnetite, the shell is one end and seals other end open-ended tubular structure, the confined one end of shell stretches into in the mounting hole and shell opening one end fix the installation end inboard, magnetite one end is fixed with sealed lid, the magnetite stretches into in the shell and sealed lid is fixed with the installation end.

The shell can be effectual hinder the magnetite and separate with the inner chamber, the life of effectual extension magnetite, the shell can adopt metal material to make also can adopt plastics material to make as long as the magnetism of not obstructing the magnetite can, impurity in the casing will lose the trend of adsorbing on the casing after taking off the magnetite, can be through back flush scrubbing, and it is very convenient to design like this, and stability is better.

In foretell universal hanging stove filter, the inboard of installation end is equipped with and is annular protruding edge, the opening of shell is served and is equipped with the fender edge of turning over to the outside, keep off along with protruding form between following and keep off and be equipped with sealed the pad between the two, the inboard threaded connection of installation end has the joint, the tip top of joint is pressed and is kept off along last messenger, sealed pad and protruding along the three and support each other and lean on to form sealedly, sealed lid is also connected on the joint through threaded connection.

Compared with the prior art, the product has the advantages that:

1. this design is through setting up the fixed position between three way connection and the casing on the inner tube, and concrete structure is that the inner tube restricts axial motion through the joint structure in the casing and three way connection accomplishes fixedly with the casing promptly, because the inner tube stretches into water and holds in the end be equivalent to hide in water and hold the external unable contact, so do not have the possibility that the people was opened by accident, so make the security of this filter obtain promoting.

2. This design has also moved tee bend and the sealed position of crossing the water end to cross in the water end, can't contact sealed position outside the filter, the fine sealed position of hiding tee bend and crossing between the water end of design like this, the effectual artificial damage that has prevented causes the leakage, further improvement the security.

3. The annular bulge of this design not only plays and to keep out the effect can also play the effect of location inner tube and play the support to the side direction of inner tube with the jump ring, has improved the fixed strength of inner tube, also further increase the fail safe nature of filter.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a half sectional view of the present invention;

FIG. 3 is a detail view of the three-way joint of the present invention;

FIG. 4 is a half-sectional view of the three-way joint of the present invention;

fig. 5 is a detail view of the housing of the present invention.

In the figure, 1, a housing; 11. a water passing end; 12. an installation end; 2. a three-way joint; 21. an inner tube; 211. a ring groove; 22. an annular projection; 3. a filter element assembly; 31. a magnetic bar; 311. a housing; 3111. blocking edges; 312. a magnet; 32. filtering with a screen; 321. mounting holes; 4. a clamping structure; 41. an annular projection; 42. a clamp spring; 5. a seal ring; 6. a sealing cover; 7. a gasket; 8. and (4) a joint.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

Example one

As shown in fig. 1-5, the universal wall-hanging stove filter comprises a casing 1 and a three-way joint 2, wherein a filter element assembly 3 is arranged in the casing 1, the filter element assembly 3 comprises a filter screen 32 and a magnetic rod 31, the filter screen 32 is in a hollow cylindrical structure, a mounting hole 321 is formed in the center of the filter screen 32, and the magnetic rod 31 is located in the mounting hole 321. This filter element group spare 3 includes filter screen 32 and bar magnet 31, sets up bar magnet 31 and can intercept impurity at filter screen 32 internal filter screen 32, and bar magnet 31 can adsorb impurity, lets impurity just can be adsorbed when contacting filter screen 32, designs the effectual filterable effect that has improved this filter like this. The casing 1 is provided with an installation end 12 opposite to the installation hole 321, the magnetic rod 31 comprises a casing 311 and a magnet 312, the casing 311 is of a tubular structure with one end closed and the other end open, the closed end of the casing 311 extends into the installation hole 321, the open end of the casing 311 is fixed on the inner side of the installation end 12, one end of the magnet 312 is fixed with a sealing cover 6, and the magnet 312 extends into the casing 311 and the sealing cover 6 is fixed with the installation end 12. A sewage discharge end is also arranged near the mounting end 12, and the sewage discharge end can be opened to carry out back washing and sewage discharge in the shell 1. The shell 311 can be effectual separate magnetite 312 and inner chamber resistance, the life of effectual extension magnetite 312, shell 311 can adopt metal material to make also can adopt plastics material to make as long as the magnetism of not obstructing magnetite 312 can, the impurity in casing 1 will lose the trend of adsorbing on filter core or casing 1 after taking off magnetite 312, can be through the back flush scrubbing, and it is very convenient to design like this, and stability is better. The inboard of installing end 12 is equipped with and is annular protruding edge 12, and the opening of shell 311 is served and is equipped with the fender edge 3111 that turns over to the outside, keeps off and forms between 3111 and the protruding edge 12 and keep out and be equipped with sealed the pad 7 between the two, and the inboard threaded connection of installing end 12 has joint 8, and the tip top of joint 8 is pressed and is being kept off along 3111 and make and keep off along 3111, sealed pad 7 and protruding edge 12 three support each other and lean on to form sealedly, and sealed lid 6 also passes through threaded connection on joint 8. The upper end of the shell 1 is also provided with an exhaust assembly, the exhaust assembly comprises a buoy and an exhaust valve, and the buoy can open or close the exhaust valve according to water level change.

The outer peripheral surface of the middle part of the shell 1 is provided with a water passing end 11 which is right opposite to the magnetic rod 31 and the filter element, the three-way joint 2 comprises a water inlet head, a water outlet head and a water passing head, an inner pipe 21 is arranged in the water passing head, the water inlet head is only communicated with the inner pipe 21, and the water inlet head is communicated with the water passing head. The water passing head is abutted against the water passing end 11 and forms a seal with the water passing end 11, and a clamping structure 4 for limiting the inner pipe 21 to move along the central line direction of the water passing end 11 is arranged between the inner pipe 21 and the shell 1. This three way connection 2 has one end of inner tube 21 and supports and form sealedly on passing water end 11, then set up joint structure 4 through between inner tube 21 and the casing 1 and fix inner tube 21, because inner tube 21 and whole three way connection 2 are integrated into one piece, so inner tube 21 is after the motion along the central line direction of crossing water end 11 is restricted, three way connection 2 can keep supporting the trend that leans on passing water end 11, just also keep with passing water end 11 sealed, this design has moved the fixed knot structure between three way connection 2 and the casing 1 and has hidden in passing water end 11 and has prevented that the people from opening three way connection 2 in the outside, design security is better like this. In addition, the sealing position between the three-way joint 2 and the shell 1 is also moved into the water passing end 11, so that the three-way joint and the outer side of the shell 1 are butted together imperfectly, the position which can be damaged is difficult to find, and the safety is further improved.

The outer peripheral surface of the water passing head is provided with an annular convex part 22, the water passing head part extends into the water passing end 11 and is sealed with the water passing end 11 in the circumferential direction, and the annular convex part 22 abuts against the water passing end 11. The inboard of crossing water end 11 is seted up and is annular constant head tank, crosses in the water head stretches into the constant head tank, inlays on the outer peripheral face that three way connection 2 has one end of inner tube 21 and is equipped with a plurality of sealing washers 5, and sealing washer 5 all supports with the inner wall of crossing water end 11 and leans on to form sealedly. The positioning groove has two functions: one is that the tee joint 2 is used for positioning the tee joint 2 as the name suggests, and the tee joint 2 has the advantages that the inner diameter of one end of the inner pipe 21 extending into the positioning groove in the positioning groove is more matched with the outer diameter of the tee joint 2, so that the tee joint 2 can be installed in a non-inclined mode and has better stability; secondly, form between sealing washer 5 and the cell wall of constant head tank sealed, a plurality of sealing washers 5 form sealed better with the cell wall of constant head tank, further improvement this universal filter's connection stability. This three way connection 2 supports and leans on the port department of crossing water end 11 and crosses water end 11 through crossing the cyclic annular convex part 22 of flood peak and forms and support, then restricts inner tube 21 axial displacement through the joint structure 4 between inner tube 21 and the casing 1 for three way connection 2 firmly fixes on crossing water end 11, and design simple structure like this, and fixed strength and stability are all high. Three way connection 2 and water end 11 between sealed stretch into through the water head and cross in water end 11 rather than inside wall circumference seal accomplish, design like this makes leakproofness between the two good bad irrelevant with three way connection 2 and the joint strength who crosses water end 11, as long as three way connection 2 still fixes on crossing water end 11 then both sealed just exist all the time and can not receive 2 circumferential direction's of three way connection influence sealed, design by a wide margin like this the security of this universal filter.

The clamping structure 4 comprises an annular protrusion 41 positioned on the inner side of the water inlet end, the inner tube 21 penetrates through the annular protrusion 41, a clamp spring 42 is fixed at the end part of the inner tube 21, and the clamp spring 42 and the annular protrusion 41 can form a stop to limit the inner tube 21 to move towards the outlet direction of the water outlet end. An annular groove 211 is formed in the outer peripheral surface of the end portion of the inner tube 21, the clamp spring 42 is clamped in the annular groove 211, the outer side portion of the clamp spring 42 is exposed out of the annular groove 211, and the outer diameter of the clamp spring 42 is larger than the inner diameter of the annular protrusion 41. The inner side of the clamp spring 42 is clamped in the annular groove 211, and the clamp spring 42 exposed out of the annular groove 211 is abutted against the annular protrusion 41, so that the clamp spring 42 is simple in design structure and convenient to mount. The inner tube 21 is in clearance fit with the annular protrusion 41, and a plurality of water passing holes 42 which are uniformly distributed are formed in the annular protrusion 41. Inner tube 21 and the protruding 41 clearance fit of annular, the design can effectually prevent that inner tube 21 from taking place the tremble when crossing water like this, and annular protrusion 41 not only plays and can also play the effect of fixing a position inner tube 21 and play the effect of supporting to inner tube 21 with the effect that jump ring 42 kept out, has improved the joint strength and the connection stability of whole three way connection 2. The water through holes 42 are used for communicating the inner cavity of the shell 1 with the water passing head, and actually the water passing hole and the water passing head are not sealed, but the water passing gap between the water passing hole and the water passing head influences the passing of water flow, so that the water flow can smoothly circulate due to the arrangement of the water through holes 42. Jump ring 42 and the protruding 41 design of annular can effectual restriction inner tube 21 break away from water end 11, jump ring 42 and the protruding 41 circumference rotation of inner tube 21 of limiting only in the axial, and this three way connection 2 can be random universal rotation and can not influence joint strength and stability, can not influence three way connection 2 and the leakproofness of crossing water end 11 yet, further promotion this universal filter's stability. And after three way connection 2 adjusted angle and position, water pressure can make jump ring 42 and annular protrusion 41 support more inseparabler when passing through high-pressure liquid in the filter, increases the frictional force between jump ring 42 and the annular protrusion 41, and the effectual filter that prevents is by artificial or unexpected rotation three way connection 2 in the use, further improvement this universal filter connected stability.

Example two

In this embodiment, the locking structure 4 includes a plurality of locking claws located at an end of the inner tube 21, an annular locking groove is provided in the housing 1, and the inner tube 21 is locked in the locking groove by the locking claws to limit the inner tube 21 from moving toward the outlet of the water outlet end. Inner tube 21 grabs through the jack catch and can play the same limiting displacement in annular draw-in groove, and jack catch evenly distributed then passes through the claw in the draw-in groove at the port department of inner tube 21, because the draw-in groove is the loop configuration, inner tube 21 rotates the jack catch and also can rotate around the draw-in groove central line in the draw-in groove, so the design can play the same technological effect with foretell scheme.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims (10)

1. The utility model provides an universal hanging stove filter, includes casing (1) and three way connection (2), be equipped with filter element group spare (3) in casing (1), the crossing water end (11) just to filter element group spare (3) have on casing (1), three way connection head (2) are connected on crossing water end (11) and three way connection head (2) have towards inner tube (21) that extend in crossing water end (11), a serial communication port, three way connection head (2) and cross water end (11) circumference sealed, inner tube (21) stretch into in crossing water end (11) and be equipped with joint structure (4) with inner tube (21) axial fixity between the inner wall of inner tube (21) and casing (1).

2. A universal wall-hanging stove filter as claimed in claim 1, characterized in that one end of the three-way joint (2) extends into the water passing end (11) and is sealed with the inner side wall of the water passing end (11) in the circumferential direction, and the three-way joint (2) is provided with an annular convex part (22) which forms a stop with the water passing end (11).

3. The universal wall-hanging stove filter as claimed in claim 2, wherein the clamping structure (4) comprises an annular protrusion (41) located at the inner side of the water inlet end, the inner pipe (21) penetrates through the annular protrusion (41) and a clamp spring (42) is fixed at the end of the inner pipe (21), and the clamp spring (42) can form a stop with the annular protrusion (41) to limit the inner pipe (21) to move towards the outlet direction of the water outlet end.

4. The universal wall-hanging stove filter according to claim 2, characterized in that the clamping structure (4) comprises a plurality of clamping jaws located at the end of the inner tube (21), an annular clamping groove is arranged in the housing (1), and the inner tube (21) is clamped into the clamping groove through the clamping jaws to limit the inner tube (21) to move towards the outlet direction of the water outlet end.

5. The universal wall-hanging stove filter as claimed in claim 3, wherein the inner tube (21) is in clearance fit with the annular protrusion (41), and the annular protrusion (41) is provided with a plurality of water through holes (42) which are uniformly distributed.

6. The universal wall-hanging stove filter as claimed in claim 5, wherein the outer peripheral surface of the end of the inner tube (21) is provided with a ring groove (211), the snap spring (42) is clamped in the ring groove (211) and the outer part of the snap spring (42) is exposed out of the ring groove (211), and the outer diameter of the snap spring (42) is larger than the inner diameter of the annular protrusion (41).

7. The universal wall-mounted boiler filter as claimed in claim 1, 2, 3, 5 or 6, wherein at least one sealing ring (5) is embedded on the outer peripheral surface of one end of the three-way joint (2) extending into the water passing end (11), and the sealing ring (5) is abutted against the inner wall of the water passing end (11) to form a seal.

8. A universal wall hanging stove filter as claimed in claim 7, characterized in that the filter element assembly (3) comprises a filter screen (32) and a magnetic bar (31), the filter screen (32) is a hollow cylindrical structure and the filter screen (32) has a mounting hole (321) in the center, and the magnetic bar (31) is located in the mounting hole (321).

9. The universal wall-mounted boiler filter as claimed in claim 8, wherein the casing (1) is provided with a mounting end (12) opposite to the mounting hole (321), the magnetic rod (31) comprises a casing (311) and a magnet (312), the casing (311) is of a tubular structure with one end closed and the other end open, the closed end of the casing (311) extends into the mounting hole (321) and the open end of the casing (311) is fixed on the inner side of the mounting end (12), one end of the magnet (312) is fixed with a sealing cover (6), and the magnet (312) extends into the casing (311) and the sealing cover (6) is fixed with the mounting end (12).

10. The universal wall-hanging stove filter according to claim 9, characterized in that the inside of the mounting end (12) is provided with a convex edge (12) which is annular, one end of the opening of the housing (311) is provided with a blocking edge (3111) which is turned over outwards, a blocking edge (3111) and the convex edge (12) are formed between the blocking edge and the convex edge and a sealing gasket (7) is arranged between the blocking edge and the convex edge, the inside of the mounting end (12) is connected with a joint (8) by screw thread, the end of the joint (8) is pressed against the blocking edge (3111) to enable the blocking edge (3111), the sealing gasket (7) and the convex edge (12) to abut against each other to form sealing, and the sealing cover (6) is also connected to the joint (8) by screw thread.

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