CN213954484U - Vacuum blowoff valve antiseep structure - Google Patents

Abstract

The utility model relates to an anti-leakage structure of a vacuum blowoff valve, which comprises a vacuum blowoff valve capable of realizing the on-off of sewage flow, an upstream connecting component and a downstream connecting component which are respectively arranged at the two sides of the vacuum blowoff valve; the vacuum blowoff valve is provided with a sewage flow end and a negative pressure flow end along the sewage flow direction; the upstream connecting assembly is hermetically connected with the sewage flowing end and is used for realizing the sewage flowing into the vacuum sewage discharge valve; the downstream connecting component is hermetically connected with the negative pressure flowing end and used for discharging sewage after passing through the opened vacuum blowoff valve, and a positioning mechanism for preventing the vacuum blowoff valve from realizing circumferential and axial movement is arranged at the connection part; the utility model is used for the realization is applied to the external sealed fixed of vacuum blowoff valve in the vacuum closestool, through reasonable and simple external mode implementation structure along circumference and axial location, and the location is good, and can further guarantee sealed reliable, has reduced the fault rate of vacuum blowoff valve, has further reduced the service failure rate of vacuum closestool.

Description

Vacuum blowoff valve antiseep structure

Technical Field

The utility model relates to the technical field of vacuum sewage collection, transportation and treatment, wherein the vacuum sewage collection technology refers to a front-end device or a product for collecting sewage at a sewage source, including but not limited to various kitchens (such as a toilet, a urinal, a shower room, a bathtub and the like) and sanitary products (such as a vegetable washing tank, a dish washing machine and the like); the vacuum sewage conveying technology is related to the technology of efficiently conveying sewage collected by a front-end device or a product to sewage post-treatment equipment, and comprises core components of a vacuum pump station, a sewage collecting tank, an underground (main arrangement form) vacuum conveying pipe network system, a vacuum well, a fault detection and diagnosis system and the like; vacuum sewage treatment technique indicates aftertreatment equipment or device, and the primary function is to concentrate the sewage of collecting and carry out solid-liquid separation and purification, and organic fertilizer can be made into to wherein solid, and sewage realizes green emission after MBR membrane technology filtration purification, the utility model discloses then in particular to be applied to a vacuum blowoff valve anti-seepage leak structure in the vacuum closestool.

Background

As is well known, sewage systems generally include gravity sewage systems and vacuum sewage systems, wherein the vacuum sewage system is the foremost technology of sewage collection, and the basic realization principle is as follows: first, the sewage collection inlet line (or blowdown inlet line) in the vacuum sewage delivery system is connected to various sewage front end collection devices, including but not limited to various kitchens (such as toilets, urinals, shower stalls, tubs, etc.) and sanitary products (such as sink basins, dishwashers, etc.); secondly, the vacuum pump set generates vacuum in the vacuum sewage conveying system; finally, in the working process of the sewage front-end collecting device, after the vacuum sewage discharge valve is connected, the pressure difference between the external atmospheric pressure and the vacuum value in the pipeline in the vacuum sewage conveying system is acted on the sewage and mixed with air to realize the turbulent conveying of the sewage into the sewage collecting inlet pipeline (or the sewage discharge inlet pipeline).

In the technical field of vacuum toilet pollution discharge, the vacuum pollution discharge valve plays an important role, and in the vacuum toilet fault, the vacuum pollution discharge valve is most easily damaged, and the damaged type comprises that the sewage discharge outlet of the vacuum toilet body and the interface of the vacuum pollution discharge valve leak water, a sealing ring in a main valve element assembly of the vacuum pollution discharge valve is easy to clamp and pause, and the like; in order to ensure the reliability of the vacuum blowoff valve, the structure of the valve core assembly inside the vacuum blowoff valve and the connection and fixation structure outside the vacuum blowoff valve are very important.

Over the past 80 years, researchers in the countries of the europe and the america have tried methods and techniques to reduce the reliability of vacuum waste valves in vacuum toilets, and although the related technologies in the country have accumulated for a relatively short time, they have had some breakthrough in the field of vacuum waste discharge.

Currently, there are several types of vacuum waste valves known:

first, a pinch valve: reference is made to core patents FR2366186B1 (1976), US3984080 (1976), US6575425 (2003), CN101225673A (2007), US7832431 (2010), CN101046105B (2011), US 85006 (2013), CN103438237A (2013), CN105089131A (2014), CN108006260A (2017), CN109083236A (2018), CN109027302A (2018), CN108457345A (2018), CN109138114A (2019), CN109973697A (2019);

for the known technology, the connection mode is a mode of tightly holding a sheet metal hoop on a joint of a connecting pipe fitting, the fixation is firm, but the disassembly is inconvenient, one more part is provided, and more importantly, the fixation mode leads to single specification of the applicable vacuum closestool.

Secondly, cartridge valve: reference to core patents is US2420849 (1943), US5082238 (1990), US5078174 (1990), US5575454 (1994), EP0778432B1 (1995), CN1201057C (1998);

the known technology has the problems that: although the rubber sleeve is locked by the clamp, the rubber sleeve is easy to age, harden and become brittle to cause sealing failure when the rubber sleeve is used for a long time.

Therefore among the prior art, to the external connection structure of pipe clamp valve and cartridge valve, there are insecure, sealing performance is poor and the problem that the use limitation is big, the utility model discloses a vacuum blowoff valve antiseep structure has been developed to solve the problem that exists among the prior art, through the retrieval, not discover with the utility model discloses same or similar technical scheme.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the purpose is: the anti-leakage structure of the vacuum blow-down valve is provided to solve the problems of insecure connection, poor sealing performance and large use limitation caused by unreasonable connection mode of the vacuum blow-down valve in the prior art.

The technical scheme of the utility model is that: an anti-leakage structure of a vacuum blowoff valve comprises the vacuum blowoff valve which can realize the on-off of the flowing of sewage, an upstream connecting component and a downstream connecting component which are respectively arranged at the two sides of the vacuum blowoff valve; the vacuum blowoff valve is provided with a sewage flow end and a negative pressure flow end along the sewage flow direction; the upstream connecting assembly is hermetically connected with the sewage flowing end and is used for realizing the sewage flowing into the vacuum sewage discharge valve; the low reaches coupling assembling and negative pressure flow end sealing connection to discharge behind the vacuum blowoff valve that realizes sewage and open, low reaches coupling assembling is kept away from one side frame that negative pressure flow end and is supported on a backplate, and with the backplate junction and with negative pressure flow end junction be provided with the positioning mechanism who avoids vacuum blowoff valve to realize circumference and axial motion.

Preferably, a sewage discharge flow channel which realizes sewage flow and keeps consistent inner diameter is arranged in the vacuum sewage discharge valve, and the sewage flow end and the negative pressure flow end are respectively arranged at two sides of the sewage discharge flow channel; the sewage flowing end is provided with an external connecting sleeve with the inner diameter larger than the outer diameter of the sewage discharge flow channel, and the outer wall of the external connecting sleeve is in a threaded shape; the negative pressure flowing end is provided with a reinforcing sleeve with the inner diameter equal to the outer diameter of the sewage drainage flow channel.

Preferably, the upstream connecting component comprises an upstream sewage discharge pipe, a lip-shaped sealing ring and a locking threaded sleeve; the upstream sewage discharge pipe and the sewage discharge flow channel are coaxially arranged, the end part of the upstream sewage discharge pipe is positioned in the external connecting sleeve, the end surface of the upstream sewage discharge pipe is attached to the end surface of the sewage discharge flow channel, and the inner diameter of the upstream sewage discharge pipe is the same as that of the sewage discharge flow channel; the lip-shaped sealing ring is sleeved at the end part of the upstream sewage pipe and is positioned in the external connecting sleeve, and the outer wall of the lip-shaped sealing ring is tightly attached to the inner wall of the external connecting sleeve; the locking swivel nut is terminal surface open-ended lid column structure, and the open end cooperates with the grafting of upper reaches blow off pipe, and the inside wall is the screw thread form to with outer sleeve pipe outer wall threaded connection, realize linking closely laminating between sleeve pipe, lip seal and the upper reaches blow off pipe outward.

Preferably, the downstream connecting component comprises a downstream sewage draining pipe and an annular sealing ring; the downstream sewage discharge pipe and the sewage discharge flow channel are coaxially arranged, the end part of the downstream sewage discharge pipe is inserted into the reinforcing sleeve, the end surface of the downstream sewage discharge pipe is attached to the end surface of the sewage discharge flow channel, and the inner diameter of the downstream sewage discharge pipe is the same as that of the sewage discharge flow channel; the annular sealing ring is arranged between the outer wall of the end part of the downstream sewage discharge pipe and the inner wall of the reinforcing sleeve.

Preferably, the specific structure of the positioning mechanism is as follows: the first notch is arranged on one side of the sewage drainage flow channel, which is deviated to the negative pressure flowing end, the first embedded block is arranged at the end part of the downstream sewage drainage pipe and is in nested fit with the first notch, the positioning sleeve is arranged on the outer wall of the downstream sewage drainage pipe at the joint of the positioning sleeve and the back plate, and the positioning boss is fixed on the outer wall of the downstream sewage drainage pipe; the first notch is arranged on the inner wall of the end part of the sewage drainage flow channel, and the first embedded block extends outwards from the inner wall of the downstream sewage drainage pipe and is in nested fit with the first notch, so that the circumferential positioning of the vacuum sewage drainage valve relative to the downstream sewage drainage pipe is realized; one end of the downstream sewage discharge pipe, which is far away from the vacuum sewage discharge valve, is in inserted fit with the back plate, and the back plate is provided with an insertion hole and an insertion groove matched with the positioning boss, so that the circumferential positioning of the downstream sewage discharge pipe relative to the back plate is realized; the positioning sleeve is arranged on one side of the back plate, which is deviated from the vacuum blowoff valve, and the end face of the positioning sleeve is attached to the end face of the back plate, so that the axial positioning is realized.

Preferably, the low reaches blow off pipe adopts components of a whole that can function independently structural design, the low reaches blow off pipe is including coaxial setting and sealing connection's connecting sleeve and coupling, connecting sleeve and negative pressure flow end are connected, coupling and backplate support the location.

Preferably, a second notch is formed in the inner wall of one side, which is close to the connecting sleeve, of the pipe joint, and a second embedded block which is in nested fit with the second notch extends outwards from the inner wall of the end part of the connecting sleeve; the positioning sleeve is arranged at the end part of the pipe joint and extends to one side of the connecting sleeve, and an annular sealing ring is arranged between the inner side of one end extending out of the pipe joint and the outer wall of the end part of the connecting sleeve.

Compared with the prior art, the utility model has the advantages that:

(1) the utility model is used for the realization is applied to the external sealed fixed of vacuum blowoff valve in the vacuum closestool, through reasonable and simple external mode implementation structure along circumference and axial location, and the location is good, and can further guarantee sealed reliable, has reduced the fault rate of vacuum blowoff valve, has further reduced the service failure rate of vacuum closestool.

(2) The connection mode of the upstream connection assembly and the downstream connection assembly is simple, and the upstream connection assembly and the downstream connection assembly are not required to be fixed through a hoop and a fixing screw, so that the problem that the sealing performance is influenced due to the fact that the structure is easy to age and become brittle in the prior art is solved; the utility model discloses a connected mode has realized reasonable effectual sealed, but this sealed condition need avoid the structure to appear removing, otherwise sealing performance can greatly reduced, consequently designed positioning mechanism to this requirement, can effectively avoid the vacuum blowoff valve to take place along the motion of axial and circumference to the leakproofness for the junction provides reasonable guarantee.

(3) In the utility model, the downstream blow-off pipe can also adopt a split structure design, so that the connecting sleeve with corresponding length can be adapted according to vacuum toilets with different specifications, and the limitation of the connecting mode of the vacuum blow-off valve is reduced; this in-process has then involved coupling and connecting sleeve's being connected, and its sealing performance can be realized through effective sealed and the ring packing ring between them, and the location along circumference can be realized through second notch and second abaculus, and the position sleeve that the epitaxy set up simultaneously can also further play the positioning action to connecting sleeve to realized position sleeve's dual function, can be used for realizing axial positioning with the backplate laminating, can play the effect of joint support location again to connecting sleeve.

Drawings

The invention will be further described with reference to the following drawings and examples:

fig. 1 is a schematic view of an anti-leakage structure of a vacuum blowoff valve according to the present invention;

fig. 2 is an exploded view of the anti-leakage structure of the vacuum blowoff valve of the present invention;

FIG. 3 is a cross-sectional view of the vacuum blowoff valve of the present invention;

fig. 4 is a cross-sectional view of the anti-leakage structure of the vacuum blowoff valve of the present invention;

FIG. 5 is an enlarged view of a partial structure at the position A of the anti-leakage structure of the vacuum waste valve of the present invention;

FIG. 6 is an enlarged view of a partial structure at the position B of the vacuum blowoff valve anti-leakage structure of the present invention;

fig. 7 is a partial structure enlarged view of the position C of the vacuum blowoff valve anti-leakage structure of the present invention.

Wherein: 1. a vacuum blowoff valve;

11. a sewage flowing end 12, a negative pressure flowing end 13, a sewage discharging flow channel 14, an external connecting sleeve 15, a reinforcing sleeve 16 and a first notch;

2. an upstream connection assembly;

21. an upstream sewage discharge pipe 22, a lip-shaped sealing ring 23 and a locking threaded sleeve;

3. a downstream connection assembly;

31. a downstream sewage discharge pipe 32, an annular sealing ring 33, a first insert 34, a positioning sleeve 35 and a positioning boss;

311. a connecting sleeve 312, a pipe joint 313, a second notch 314 and a second embedded block;

4. a back plate;

41. plug hole, 42, plug groove.

Detailed Description

The following detailed description is made in conjunction with specific embodiments of the present invention:

as shown in fig. 1 and 2, an anti-leakage structure of a vacuum blowoff valve comprises a vacuum blowoff valve 1 capable of realizing the on-off of sewage flow, an upstream connecting component 2 and a downstream connecting component 3 respectively arranged at two sides of the vacuum blowoff valve 1; simply, the vacuum sewer valve 1 is provided with a sewage flowing end 11 and a negative pressure flowing end 12 along the sewage flowing direction; the upstream connecting component 2 is hermetically connected with the sewage flowing end 11 and is used for realizing the sewage flowing into the vacuum blowoff valve 1; the downstream connecting component 3 is connected with the negative pressure flowing end 12 in a sealing mode and used for discharging sewage after passing through the opened vacuum blowoff valve 1, one side, far away from the negative pressure flowing end 12, of the downstream connecting component 3 is erected and supported on a back plate 4, and a positioning mechanism for preventing the vacuum blowoff valve 1 from achieving circumferential and axial movement is arranged at the joint of the downstream connecting component 3 and the back plate 4 and the joint of the downstream connecting component and the negative pressure flowing end 12.

Specifically, as shown in fig. 3, a blowdown flow channel 13 which realizes sewage flow and keeps consistent inner diameter is arranged inside the vacuum blowdown valve 1, a sewage flow end 11 and a negative pressure flow end 12 are respectively arranged at two sides of the blowdown flow channel 13, and the sewage flow direction flows from one side of the sewage flow end 11 to one side of the negative pressure flow end 12; the sewage flowing end 11 is provided with an external connecting sleeve 14 with the inner diameter larger than the outer diameter of the sewage discharge runner 13, and the outer wall of the external connecting sleeve 14 is in a thread shape; the negative pressure flowing end 12 is provided with a reinforced sleeve 15 with the inner diameter equal to the outer diameter of the sewage flow channel 13, and the outer connecting sleeve 14 and the reinforced sleeve 15 are arranged in an integral structure with the shell forming the sewage flow channel 13.

As shown in fig. 4, the upstream connecting assembly 2 is arranged at one side of the sewage flowing end 11, and as shown in fig. 5, the structure thereof comprises an upstream sewage discharging pipe 21, a lip-shaped sealing ring 22 and a locking screw sleeve 23; the upstream sewage discharge pipe 21 and the sewage discharge flow channel 13 are coaxially arranged, the end part is positioned in the external connecting sleeve 14, the end surface is attached to the end surface of the sewage discharge flow channel 13, and the inner diameter of the upstream sewage discharge pipe is the same as that of the sewage discharge flow channel 13; the lip-shaped sealing ring 22 is sleeved at the end part of the upstream sewage discharge pipe 21 and is positioned in the external connecting sleeve 14, and the outer wall of the lip-shaped sealing ring is tightly attached to the inner wall of the external connecting sleeve 14; the locking screw sleeve 23 is of a cover-shaped structure with an opening on the end face, the opening end is in plug fit with the upstream sewage discharge pipe 21, the inner side wall is in a thread shape and is in threaded connection with the outer wall of the outer connecting sleeve 14, so that the outer connecting sleeve 14, the lip-shaped sealing ring 22 and the upstream sewage discharge pipe 21 are tightly attached, and the vacuum sewage discharge valve 1 and the upstream sewage discharge pipe 21 are fixedly connected; since the present embodiment is applied to a vacuum toilet, the upstream soil pipe 21 is a soil pipe in the vacuum toilet.

As shown in fig. 4, the downstream connecting component 3 is arranged at one side of the negative pressure flowing end 12, and as shown in fig. 6, the structure thereof comprises a downstream sewage draining pipe 31 and an annular sealing ring 32; the downstream blow-off pipe 31 and the blow-off runner 13 are coaxially arranged, the end part of the downstream blow-off pipe is inserted and sleeved in the reinforcing sleeve 15, the end surface of the downstream blow-off pipe is attached to the end surface of the blow-off runner 13, and the inner diameter of the downstream blow-off pipe is the same as that of the blow-off runner 13; the ring-shaped sealing ring 32 is disposed between the outer wall of the end of the downstream drainage pipe 31 and the inner wall of the reinforcing sleeve 15, so as to connect and seal the vacuum drainage valve 1 and the downstream drainage pipe 31, in this embodiment, the back plate 4 for supporting the end thereof is a back plate 4 structure of the rear end of the vacuum toilet body.

In order to realize the circumference and the axial location of vacuum blowoff valve 1, the utility model discloses a positioning mechanism, this positioning mechanism's concrete structure is: the device comprises a first notch 16 which is arranged at one side of the sewage flow passage 13 which is deviated to the negative pressure flow end 12 as shown in figure 6, a first insert 33 which is arranged at the end part of a downstream sewage pipe 31 as shown in figure 6 and is in nested fit with the first notch 16, a positioning sleeve 34 which is arranged at the outer wall of the downstream sewage pipe 31 at the joint with the back plate 4 as shown in figure 7, and a positioning boss 35 which is fixed at the outer wall of the downstream sewage pipe 31 as shown in figure 7; as shown in fig. 4 and 6, the first notch 16 is disposed on the inner wall of the end of the sewage flow channel 13, and the first insert 33 extends outwards from the inner wall of the downstream sewage pipe 31 and is in nested fit with the first notch 16, so as to realize circumferential positioning of the vacuum sewage valve 1 relative to the downstream sewage pipe 31; as shown in fig. 2, 4 and 7, one end of the downstream sewage pipe 31 far away from the vacuum sewage valve 1 is inserted and matched on the back plate 4, and the back plate 4 is provided with an insertion hole 41 and an insertion groove 42 matched with the positioning boss 35 for realizing circumferential positioning of the downstream sewage pipe 31 relative to the back plate 4; the positioning sleeve is arranged on one side of the back plate 4, which is deviated from the vacuum blowoff valve 1, and the end surface of the positioning sleeve is attached to the end surface of the back plate 4, so that the axial positioning is realized.

As a further optimization of the embodiment, as shown in fig. 4 and 7, the downstream sewage pipe 31 is designed in a split structure, the downstream sewage pipe 31 includes a connecting sleeve 311 and a pipe joint 312 which are coaxially arranged and hermetically connected, the connecting sleeve 311 is connected with the negative pressure flow end 12, and the pipe joint 312 is supported and positioned with the back plate 4; a second notch 313 is arranged on the inner wall of one side of the pipe joint 312, which is close to the connecting sleeve 311, and a second insert 314 which is nested and matched with the second notch 313 extends outwards from the inner wall of the end part of the connecting sleeve 311; the positioning sleeve 34 is provided at an end of the pipe joint 312 and extends toward the connection sleeve 311, and an annular seal ring 32 is provided between an inner side of one end of the pipe joint 312 and an outer wall of the end of the connection sleeve 311.

In this embodiment, the downstream drain pipe 31 adopts the split structure design for the purpose of: the connecting sleeve 311 with the corresponding length can be matched according to vacuum toilets with different specifications, so that the limitation of the connecting mode of the vacuum blow-down valve 1 is reduced; this in-process has then involved being connected of coupling 312 and adapter sleeve 311, its sealing performance can be realized through effective sealing and ring packing 32 between them, the location along circumference can be realized through second notch 313 and second abaculus 314, the position sleeve 34 of epitaxial setting can also further play the positioning action to adapter sleeve 311 simultaneously, thereby realized adapter sleeve's dual function, can be used for realizing axial positioning with the 4 laminating of backplate, can play the effect of joint support location again to adapter sleeve 311.

The utility model discloses in, upper reaches blow off pipe 21 is arranged in setting up in vacuum toilet, realize the suction of sewage in the vacuum toilet, low reaches blow off pipe 31 is used for being connected with low reaches sewage treatment tube, realize the emission of sewage in the vacuum toilet, after vacuum blowoff valve 1 is opened, sewage flows to low reaches blow off pipe 31 one side by upper reaches blow off pipe 21 one side, because upper reaches coupling assembling 2 and low reaches coupling assembling 3 all and vacuum blowoff valve 1 between adopt reasonable connection location mode, thereby the stability and the sealing reliability of junction have effectively been guaranteed, the service failure rate of vacuum toilet has further been reduced.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. It is obvious to a person skilled in the art that the invention is not limited to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention, and that the embodiments are therefore to be considered in all respects as exemplary and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (7)

1. The utility model provides a vacuum blowoff valve leak protection structure which characterized in that: the sewage treatment device comprises a vacuum sewage discharge valve capable of realizing the on-off of sewage flow, an upstream connecting assembly and a downstream connecting assembly which are respectively arranged at two sides of the vacuum sewage discharge valve; the vacuum blowoff valve is provided with a sewage flow end and a negative pressure flow end along the sewage flow direction; the upstream connecting assembly is hermetically connected with the sewage flowing end and is used for realizing the sewage flowing into the vacuum sewage discharge valve; the low reaches coupling assembling and negative pressure flow end sealing connection to discharge behind the vacuum blowoff valve that realizes sewage and open, low reaches coupling assembling is kept away from one side frame that negative pressure flow end and is supported on a backplate, and with the backplate junction and with negative pressure flow end junction be provided with the positioning mechanism who avoids vacuum blowoff valve to realize circumference and axial motion.

2. The vacuum sewer valve leakage prevention structure according to claim 1, characterized in that: the vacuum blowoff valve is internally provided with a blowoff runner which realizes sewage flow and keeps consistent inner diameter, and the sewage flow end and the negative pressure flow end are respectively arranged at two sides of the blowoff runner; the sewage flowing end is provided with an external connecting sleeve with the inner diameter larger than the outer diameter of the sewage discharge flow channel, and the outer wall of the external connecting sleeve is in a threaded shape; the negative pressure flowing end is provided with a reinforcing sleeve with the inner diameter equal to the outer diameter of the sewage drainage flow channel.

3. The anti-leakage structure of the vacuum blowoff valve of claim 2, wherein: the upstream connecting component comprises an upstream sewage discharge pipe, a lip-shaped sealing ring and a locking threaded sleeve; the upstream sewage discharge pipe and the sewage discharge flow channel are coaxially arranged, the end part of the upstream sewage discharge pipe is positioned in the external connecting sleeve, the end surface of the upstream sewage discharge pipe is attached to the end surface of the sewage discharge flow channel, and the inner diameter of the upstream sewage discharge pipe is the same as that of the sewage discharge flow channel; the lip-shaped sealing ring is sleeved at the end part of the upstream sewage pipe and is positioned in the external connecting sleeve, and the outer wall of the lip-shaped sealing ring is tightly attached to the inner wall of the external connecting sleeve; the locking swivel nut is terminal surface open-ended lid column structure, and the open end cooperates with the grafting of upper reaches blow off pipe, and the inside wall is the screw thread form to with outer sleeve pipe outer wall threaded connection, realize linking closely laminating between sleeve pipe, lip seal and the upper reaches blow off pipe outward.

4. The anti-leakage structure of the vacuum blowoff valve of claim 2, wherein: the downstream connecting component comprises a downstream sewage discharge pipe and an annular sealing ring; the downstream sewage discharge pipe and the sewage discharge flow channel are coaxially arranged, the end part of the downstream sewage discharge pipe is inserted into the reinforcing sleeve, the end surface of the downstream sewage discharge pipe is attached to the end surface of the sewage discharge flow channel, and the inner diameter of the downstream sewage discharge pipe is the same as that of the sewage discharge flow channel; the annular sealing ring is arranged between the outer wall of the end part of the downstream sewage discharge pipe and the inner wall of the reinforcing sleeve.

5. The vacuum sewer valve leakage prevention structure according to claim 4, characterized in that: the specific structure of the positioning mechanism is as follows: the first notch is arranged on one side of the sewage drainage flow channel, which is deviated to the negative pressure flowing end, the first embedded block is arranged at the end part of the downstream sewage drainage pipe and is in nested fit with the first notch, the positioning sleeve is arranged on the outer wall of the downstream sewage drainage pipe at the joint of the positioning sleeve and the back plate, and the positioning boss is fixed on the outer wall of the downstream sewage drainage pipe; the first notch is arranged on the inner wall of the end part of the sewage drainage flow channel, and the first embedded block extends outwards from the inner wall of the downstream sewage drainage pipe and is in nested fit with the first notch, so that the circumferential positioning of the vacuum sewage drainage valve relative to the downstream sewage drainage pipe is realized; one end of the downstream sewage discharge pipe, which is far away from the vacuum sewage discharge valve, is in inserted fit with the back plate, and the back plate is provided with an insertion hole and an insertion groove matched with the positioning boss, so that the circumferential positioning of the downstream sewage discharge pipe relative to the back plate is realized; the positioning sleeve is arranged on one side of the back plate, which is deviated from the vacuum blowoff valve, and the end face of the positioning sleeve is attached to the end face of the back plate, so that the axial positioning is realized.

6. The vacuum sewer valve leakage prevention structure according to claim 5, characterized in that: the low reaches blow off pipe adopts components of a whole that can function independently structural design, the low reaches blow off pipe is including coaxial setting and sealing connection's connecting sleeve and coupling, connecting sleeve is connected with the negative pressure flow end, coupling and backplate support the location.

7. The vacuum sewer valve leakage prevention structure according to claim 6, characterized in that: a second notch is formed in the inner wall of one side, close to the connecting sleeve, of the pipe joint, and a second embedded block which is in nested fit with the second notch extends outwards from the inner wall of the end part of the connecting sleeve; the positioning sleeve is arranged at the end part of the pipe joint and extends to one side of the connecting sleeve, and an annular sealing ring is arranged between the inner side of one end extending out of the pipe joint and the outer wall of the end part of the connecting sleeve.

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