CN219388623U

CN219388623U - Pulse blowback valve

Info

Publication number: CN219388623U
Application number: CN202320080932.6U
Authority: CN
Inventors: 王元清; 王元义; 魏连康; 袁旭东; 谭乐嘉; 周斌
Original assignee: Sichuan Changyi Oil Gas Gathering Transportation Equipment Co ltd
Current assignee: Sichuan Changyi Oil Gas Gathering Transportation Equipment Co ltd
Priority date: 2023-01-12
Filing date: 2023-01-12
Publication date: 2023-07-21
Anticipated expiration: 2033-01-12

Abstract

The utility model discloses a pulse back-flushing valve, and relates to the technical field of valves. The utility model comprises a valve rod, a valve core sleeve, a valve seat and a corrugated pipe, and is characterized in that: a plurality of slag storage grooves I are formed in the lower part of the circumferential surface of the valve core, which is in contact with the valve core sleeve, along the axial direction of the valve core; the sealing surface of the sealing pair formed by the valve seat and the bottom of the valve core protrudes out of the valve seat body, and a slag storage groove II is formed between the protruding sealing surface and the valve core sleeve. According to the utility model, the slag storage groove structure is arranged on the valve core, the valve seat and the valve core sleeve form the slag storage groove, most particles fall into the slag storage groove on the valve core during operation, so that the particles are prevented from falling onto the sealing surface, and the service life of the sealing surface is prolonged.

Description

Pulse blowback valve

Technical Field

The utility model relates to the technical field of valves, in particular to a pulse back-flushing valve.

Background

The pulse back-flushing valve is an important device of an online back-flushing cleaning system of a high-temperature high-pressure silica powder filter ceramic filter element in a polycrystalline silicon production device, and is used for controlling the pressure of the silica powder filter element after back-flushing cleaning to be reduced to the maximum value, preventing a filter element from being damaged and failing, and ensuring the normal operation of a polycrystalline silicon process system.

The valve is frequently opened and closed, is in direct contact with high-temperature high-pressure hydrogen, and requires the generation of a pulsed gas flow under high pressure differential conditions. Therefore, high requirements are put on the structural design, the manufacturing process and the material selection of the pulse back-flushing valve. The method has the following characteristics:

1. inlet pressure: 3.1-3.4 MPa, outlet pressure: 2.7-3.0 MPa, and inlet and outlet pressures are very close;

2. the total response time of the switch valve is less than 1s, and the switch is required to be very rapid so as to generate high-pressure pulse airflow;

3. the service life is longer than hundred thousand times.

The applicant applied for a patent entitled "pulse back-flushing valve" in 2022, 8 and 18, which is dedicated to the grant notice of 2022, 11 and 18, CN217842694U. The utility model discloses a pulse back-flushing valve, wherein a medium enters a gap between a valve core sleeve and a valve core from an inlet through a window on the valve core sleeve, so that the medium enters an upper cavity of the valve core, and downward acting force is generated, so that the valve core can leave a valve seat only by small force when the valve is opened, the back-flushing valve can be opened rapidly, the response time is short, the working condition requirement of a polysilicon manufacturing process system on the valve is met, and meanwhile, a spring is arranged on a valve rod in a bracket, so that the initial force of a sealing surface of the valve is ensured. When the process system is unexpected (such as power failure or gas failure, etc., which causes interlocking stop and threatens the safety production), the valve is automatically in a closed state, thereby improving the safety of the system. The bellows wraps the valve rod and the valve core completely, so that the leakage of inlet and outlet gases is prevented, most of the valve rod is protected, erosion and corrosion of high-pressure hydrogen are avoided, and the service life of the valve rod is effectively prolonged.

The pulse back-flushing valve is found in the application process of the pulse back-flushing valve under the high temperature and high pressure of the actual working condition, the medium for the back-flushing valve is recycled hydrogen, a certain amount of silane particles with higher hardness are contained in the medium, once the particles fall on a sealing pair formed by a valve core and a valve seat during working, the sealing surface is damaged, silane has stronger corrosiveness, and the sealing surface is corroded by the silane, so that the sealing pair cannot be used continuously due to the factors, and the valve core and the valve seat need to be repaired.

Disclosure of Invention

In order to overcome the defects and shortcomings in the prior art, the utility model provides a pulse back-flushing valve, and aims to solve the problems that silane particles in the prior art damage sealing surfaces between a valve core and a valve seat and the service life of a sealing pair between the valve core and the valve seat is shortened. According to the utility model, the slag storage groove structure is arranged on the valve core, the valve seat and the valve core sleeve form the slag storage groove, most particles fall into the slag storage groove on the valve core during operation, so that the particles are prevented from falling onto the sealing surface, and the service life of the sealing surface is prolonged.

In order to solve the problems in the prior art, the utility model is realized by the following technical scheme:

the utility model provides a pulse back flushing valve which comprises a valve cover, a valve body, a valve rod, a valve core sleeve, a valve seat and a corrugated pipe, wherein a plurality of slag storage grooves I are formed in the lower part of the circumferential surface of the valve core, which is in contact with the valve core sleeve, along the axial direction of the valve core; the sealing surface of the sealing pair formed by the valve seat and the bottom of the valve core protrudes out of the valve seat body, and a slag storage groove II is formed between the protruding sealing surface and the valve core sleeve.

Further preferably, the upper end of the slag storage tank I is sealed by sliding fit between the peripheral surface of the upper part of the valve core and the valve core sleeve.

Still more preferably, the slag storage groove I is a groove formed on the circumferential surface of the lower part of the valve core.

Still more preferably, the diameter of the lower peripheral surface of the valve core is smaller than the diameter of the upper peripheral surface of the valve core, and the slag storage groove I is formed by the diameter difference between the lower peripheral surface of the valve core and the upper peripheral surface of the valve core.

Still more preferably, the cross section of the upper part of the valve core is circular, and the cross section of the lower part of the valve core is polygonal and inscribed on the cross section of the upper part of the valve core.

Further preferably, the hard alloy ring is deposited on the valve seat, the top surface of the deposited hard alloy protrudes out of the valve seat body to form a sealing surface matched with the valve core in a sealing way, and a sealing ring matched with the hard alloy ring is arranged at the bottom of the valve core.

Further preferably, the lower end of the corrugated pipe is welded at the lower end of the valve rod in a sealing way through a sealing connecting piece, and the upper end of the corrugated pipe is connected with the upper sealing piece in a sealing way; the upper end of the valve rod passes through the upper sealing element, and the valve rod is in sliding sealing fit with the upper sealing element.

Still further preferably, a plurality of screw holes are formed along the radial direction of the valve core, an assembly cavity for being assembled with the bottom of the valve rod is formed in the valve core, and the valve core and the valve rod are fixedly locked together by a locking screw through the screw holes.

Still more preferably, a compression coil is sleeved at the bottom of the valve rod, and the locking screw acts on the compression coil to fixedly lock the valve core and the valve rod together.

The bottom of the valve rod is provided with an assembly groove for assembling the compression wire ring, and the assembly groove is a groove concaved inwards on the circumferential surface of the valve rod.

Compared with the prior art, the beneficial technical effects brought by the utility model are as follows:

1. compared with the existing pulse back-flushing valve, the slag storage groove I is formed on the circumferential surface of the valve core, and the slag storage groove II is formed between the sealing surface of the valve seat and the valve core sleeve, so that a cavity is formed between the lower circumferential surface of the valve core and the valve core sleeve, and after the valve seat is sealed with the valve core, a cavity is formed among the valve seat, the valve core and the valve core sleeve, so that silane particles can be contained; when the valve is in operation, most particles fall into a slag storage groove II formed between the convex sealing surface of the valve seat and the valve core sleeve, and part of silane particles are adhered to the periphery of the valve core in the slag storage groove I; the silane particles are prevented from falling onto the sealing surfaces of the valve core and the valve seat due to the fact that no cavity for containing the silane particles is arranged among the valve core, the valve core sleeve and the valve seat, and therefore corrosion damage of the silane particles to the sealing surfaces of the valve core and the valve seat is avoided.

2. The slag storage groove I on the periphery of the valve core is only arranged on the periphery of the lower half part of the valve core, the upper end of the slag storage groove I is realized through sliding fit between the periphery of the upper half part of the valve core and the valve core sleeve, and the silane particles in the medium are prevented from entering a cavity between the upper end of the valve core and the valve core sleeve through the slag storage groove I, so that corrosion to parts such as the top of the valve core, a valve rod and the like is avoided.

3. In the utility model, the slag storage tank I can be formed in various forms, and can be selectively assembled and used according to actual working conditions.

4. The pulse blowback valve in the prior art has the advantages that the valve core, the valve rod and the corrugated pipe are welded together due to manufacturing and assembly, particularly, the bottom of the corrugated pipe is directly welded on the valve core, so that an integral assembly is formed for use, the valve core cannot be independently repaired, only the valve core can be replaced, the whole assembly is required to be replaced together when the valve core is replaced, the cost of the corrugated pipe is higher, and the cost of replacing the valve core is very high. The connecting piece of the corrugated pipe and the valve rod are welded to form an independent component, when the valve core is repaired, the valve core can be separated from the corrugated pipe and the valve rod component, when the valve core is used, the compression wire ring is connected with the valve rod and the corrugated pipe component, the compression wire ring is locked by the locking screw on the valve core, when the valve core is disassembled, the valve core can be disassembled by loosening the locking screw, and the valve core can be repaired or replaced, so that the maintenance cost of the valve core is reduced.

Drawings

FIG. 1 is a schematic diagram of the overall cross-sectional structure of a pulse back-flushing valve of the present utility model;

FIG. 2 is a schematic diagram of the structure between the valve core, the valve core sleeve and the valve seat in the pulse back flushing valve of the utility model;

FIG. 3 is a schematic diagram of a valve core according to the present utility model;

FIG. 4 is a schematic illustration of a valve stem bellows assembly of the present utility model;

FIG. 5 is a schematic view of the structure of the slag storage bath on the valve core of the present utility model;

reference numerals: 1. valve gap, 2, valve body, 3, valve rod, 4, case, 5, case cover, 6, disk seat, 7, bellows, 8, slag storage tank I, 9, disk seat body, 10, slag storage tank II, 11, carbide ring, 12, sealing washer, 13, sealing connection piece, 14, upper seal piece, 15, screw hole, 16, assembly chamber, 17, locking screw, 18, compress tightly the wire ring, 19, assembly groove.

Detailed Description

The technical scheme of the utility model is further elaborated below with reference to the drawings and the detailed description. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the existing pulse back-flushing valve, the outer circumference of a valve core is in sliding fit with a valve core sleeve, the bottom of the valve core is in sealing fit with a valve seat to form a sealing pair, so that a cavity capable of containing silane particles in a medium does not exist between the valve core and the valve core sleeve, and the silane particles in the medium can only be adhered to the sealing surfaces of the valve core and the valve seat, so that corrosion and damage are caused to the sealing surfaces.

In order to solve the above problems, referring to fig. 1 and 2 of the specification, the present embodiment discloses a pulse back-flushing valve, which comprises a valve cover 1, a valve body 2, a valve rod 3, a valve core 4, a valve core sleeve 5, a valve seat 6 and a bellows 7, wherein a plurality of slag storage grooves i 8 are axially formed along the valve core 4 at the lower part of the circumferential surface of the valve core 4 in contact with the valve core sleeve 5; the sealing surface of the sealing pair formed by the valve seat 6 and the bottom of the valve core 4 protrudes out of the valve seat body 9, and a slag storage groove II 10 is formed between the protruding sealing surface and the valve core sleeve 5. Other structures not indicated in the embodiment, such as an execution part, a bracket and the like of the pulse back-flushing valve, are similar to or the same as the structure of the existing pulse back-flushing valve, such as a structure shown in CN217842694U.

In the embodiment, by forming the slag storage groove I8 on the circumferential surface of the valve core 4 and forming the slag storage groove II 10 between the sealing surface of the valve seat 6 and the valve core sleeve 5, a cavity exists between the lower circumferential surface of the valve core 4 and the valve core sleeve 5, and after the valve seat 6 is sealed with the valve core 4, a cavity exists among the valve seat 6, the valve core 4 and the valve core sleeve 5, so that silane particles can be accommodated; when the valve is in operation, most particles fall into a slag storage groove II 10 formed between the convex sealing surface of the valve seat 6 and the valve core sleeve 5, and part of silane particles are adhered to the slag storage groove I8 on the circumferential surface of the valve core 4; the silane particles are prevented from falling onto the sealing surfaces of the valve core 4 and the valve seat 6 due to the fact that no cavity for containing the silane particles is arranged among the valve core 4, the valve core sleeve 5 and the valve seat 6, and therefore corrosion damage of the silane particles to the sealing surfaces of the valve core 4 and the valve seat 6 is avoided.

As a further embodiment of the present embodiment, as shown in fig. 2, the upper end of the slag storage groove i 8 is closed by a sliding fit between the upper circumferential surface of the valve core 4 and the valve core sleeve 5. The slag storage groove I8 on the circumference of the valve core 4 is only arranged on the circumference of the lower half part of the valve core 4, the upper end of the slag storage groove I8 is realized through sliding fit between the circumference of the upper half part of the valve core 4 and the valve core sleeve 5, and the corrosion of the top part of the valve core 4, the valve rod 3 and other parts caused by silane particles in a medium entering into a cavity between the upper end of the valve core 4 and the valve core sleeve 5 through the slag storage groove I8 is avoided.

As an example of the present embodiment, referring to fig. 3 of the specification, the slag storage groove i 8 is a groove formed in the lower circumferential surface of the valve body 4.

As still another example of the present embodiment, referring to fig. 3 of the specification, the diameter of the lower circumferential surface of the valve body 4 is smaller than the diameter of the upper circumferential surface of the valve body 4, and the slag storage groove i 8 is formed by a difference in diameter between the lower circumferential surface of the valve body 4 and the upper circumferential surface of the valve body 4. In the structural mode, the slag storage tank I8 is annular, larger holes are formed between the valve core 4 and the valve core sleeve 5 and are used for containing silane particles in a medium, the slag storage tank I8 adopting an axial groove structure is prevented from containing small volume, and silane particles are prevented from overflowing from the groove to the position between the valve core 4 and the valve core sleeve 5, so that abrasion and corrosion between the valve core 4 and the valve core sleeve 5 are caused.

As still another example of the present embodiment, referring to fig. 5 of the specification, the cross section of the upper portion of the valve body 4 is circular, and the cross section of the lower portion of the valve body 4 is polygonal, which is approximately inscribed in the cross section of the upper portion of the valve body 4. Compared with the above-mentioned annular slag storage tank I8, the structure of the valve core 4 is more stable, so that the lower part of the valve core 4 is also in sliding fit with the valve core sleeve 5, namely, the polygonal peak is in contact with the inner wall of the valve core sleeve 5, the peak can be regarded as an approximate arc surface, so that the valve core 4 is in sliding fit with the valve sleeve, a plurality of slag storage tanks I8 are separated through the partition of the peak, and silane particles in the slag storage tanks I8 cannot overflow and scatter other slag storage tanks I8. Finally, the waste water can fall into a slag storage groove II 10 between the valve seat 6 and the valve core sleeve 5.

As a further preferred embodiment of the present embodiment, referring to fig. 2 of the specification, a cemented carbide ring 11 is deposited on the valve seat 6, the top surface of the deposited cemented carbide protrudes out of the valve seat body 9 to form a sealing surface in sealing engagement with the valve core 4, and a sealing ring 12 in engagement with the cemented carbide ring 11 is disposed at the bottom of the valve core 4.

In the pulse back-flushing valve in the prior art, because of the reason of manufacturing and assembling, the valve core 4, the valve rod 3 and the corrugated pipe 7 are welded together, especially, the bottom of the corrugated pipe 7 is directly welded on the valve core 4, so that an integral assembly is formed for use, the valve core 4 cannot be repaired independently, only the valve core 4 can be replaced, the whole assembly is required to be replaced together when the valve core 4 is replaced, and the cost of the corrugated pipe 7 is higher, so that the cost for replacing the valve core 4 is very high.

In order to solve the technical problem, in this embodiment, the connecting piece of the bellows 7 is welded with the valve rod 3 to form a single assembly, when repairing the valve core 4, the valve core 4 can be separated from the assemblies of the bellows 7 and the valve rod 3, when in use, the valve core 4 is connected with the assemblies of the valve rod 3 and the bellows 7 by using the compression coil 18, the compression coil 18 is locked by using the locking screw 17 on the valve core 4, when in disassembly, the locking screw 17 is loosened, the valve core 4 can be disassembled by disassembling the compression coil 18, and the valve core 4 is repaired or replaced, so that the maintenance cost of the valve core 4 is reduced.

As an implementation manner of the embodiment, referring to fig. 4 in the specification, the lower end of the bellows 7 is welded at the lower end of the valve rod 3 through a sealing connector 13, and the upper end of the bellows 7 is connected with an upper sealing member 14 in a sealing manner; the upper end of the valve rod 3 passes through the upper sealing element 14, and the valve rod 3 is in sliding sealing fit with the upper sealing element 14.

Further, a plurality of screw holes 15 are formed along the radial direction of the valve core 4, an assembly cavity 16 for being assembled with the bottom of the valve rod 3 is formed in the valve core 4, and a locking screw 17 penetrates through the screw holes 15 to fixedly lock the valve core 4 and the valve rod 3 together.

As an example of this embodiment, a pressing wire ring 18 is sleeved at the bottom of the valve rod 3, and the locking screw 17 acts on the pressing wire ring 18 to fixedly lock the valve core 4 and the valve rod 3 together.

Further, an assembling groove 19 for assembling the compression wire ring 18 is formed in the bottom of the valve rod 3, and the assembling groove 19 is a groove recessed in the circumferential surface of the valve rod 3.

Claims

1. The utility model provides a pulse blowback valve, includes valve rod (3), case (4), case cover (5), disk seat (6) and bellows (7), its characterized in that: a plurality of slag storage grooves I (8) are formed in the lower part of the circumferential surface, which is in contact with the valve core sleeve (5), of the valve core (4) along the axial direction of the valve core (4); the sealing surface of the sealing pair formed by the valve seat (6) and the bottom of the valve core (4) protrudes out of the valve seat body (9), and a slag storage groove II (10) is formed between the protruding sealing surface and the valve core sleeve (5).

2. A pulse back-flushing valve as set forth in claim 1, wherein: the upper end of the slag storage tank I (8) is sealed by sliding fit between the upper circumferential surface of the valve core (4) and the valve core sleeve (5).

3. A pulse back-flushing valve as defined in claim 1 or 2, wherein: the slag storage tank I (8) is a groove formed in the circumferential surface of the lower part of the valve core (4).

4. A pulse back-flushing valve as defined in claim 1 or 2, wherein: the diameter of the lower circumferential surface of the valve core (4) is smaller than that of the upper circumferential surface of the valve core (4), and the slag storage groove I (8) is formed by the diameter difference between the lower circumferential surface of the valve core (4) and the upper circumferential surface of the valve core (4).

5. A pulse back-flushing valve as defined in claim 1 or 2, wherein: the cross section of the upper part of the valve core (4) is circular, and the cross section of the lower part of the valve core (4) is polygonal and inscribed on the cross section of the upper part of the valve core (4).

6. A pulse back-flushing valve as defined in claim 1 or 2, wherein: the valve seat (6) is provided with a hard alloy ring (11) in a surfacing mode, the top surface of the hard alloy is protruded out of the valve seat body (9) to form a sealing surface in sealing fit with the valve core (4), and the bottom of the valve core (4) is provided with a sealing ring (12) in sealing fit with the hard alloy ring (11).

7. A pulse back-flushing valve as defined in claim 1 or 2, wherein: the lower end of the corrugated pipe (7) is welded at the lower end of the valve rod (3) in a sealing way through a sealing connecting piece (13), and the upper end of the corrugated pipe (7) is connected with an upper sealing piece (14) in a sealing way; the upper end of the valve rod (3) passes through the upper sealing element (14), and the valve rod (3) is in sliding sealing fit with the upper sealing element (14).

8. A pulse back-flushing valve as set forth in claim 7, wherein: a plurality of screw holes (15) are formed along the radial direction of the valve core (4), an assembly cavity (16) for being assembled with the bottom of the valve rod (3) is formed in the valve core (4), and a locking screw (17) penetrates through the screw holes (15) to fixedly lock the valve core (4) and the valve rod (3) together.

9. A pulse back-flushing valve as set forth in claim 8, wherein: the bottom of the valve rod (3) is sleeved with a compression wire ring (18), and the locking screw (17) acts on the compression wire ring (18) to fixedly lock the valve core (4) and the valve rod (3) together.

10. A pulse back-flushing valve as set forth in claim 9, wherein: the bottom of the valve rod (3) is provided with an assembly groove (19) for assembling the compression wire ring (18), and the assembly groove (19) is a groove concave in the circumferential surface of the valve rod (3).