High-pressure gas bidirectional filter

Abstract

The utility model relates to the field of liquid rocket pressurization pipeline filtering, in particular to a high-pressure gas two-way filter which comprises a shell, a fixing cover, a filter screen and a framework. The shell is provided with a valve element cavity, the lower end of the shell is provided with a medium inlet communicated with the valve element cavity, and the upper end of the shell is provided with an assembly opening communicated with the valve element cavity. The fixing cover is provided with a medium flow cavity, the upper end of the fixing cover is provided with a medium outlet communicated with the medium flow cavity, and the lower end of the fixing cover is provided with an opening communicated with the medium flow cavity and a fixing boss with the outer circumferential face concave inwards. The framework comprises a hollow cylinder and a conical baffle; the large end of the conical baffle is in butt joint with the lower end of the hollow cylinder, the upper end of the hollow cylinder is inserted into the fixing boss, the hollow cylinder is provided with a ventilation round hole, and the filter screen wraps the peripheral face of the hollow cylinder. The lower section of the fixing cover is inserted into the valve element cavity and detachably connected with the shell, and a plurality of check rings and sealing rings are arranged between the lower section of the fixing cover and the inner wall of the valve element cavity. The pressure bearing capacity of the filter screen can be improved, and inspection and replacement of the filter screen are achieved.

Description

Technical Field

[0001] The present application relates to the field of liquid rocket booster pipeline filtration, and in particular to a high-pressure gas bidirectional filter. Background Art

[0002] The gas filter is a filtering device in the rocket gas booster system, which controls excess matter in the gas booster pipeline. The gas filter is often installed between the gas cylinder and the solenoid valve. By opening or closing the solenoid valve, the pressurized gas from the gas cylinder entering the solenoid valve is kept at a specified cleanliness level to prevent excess matter from clogging the solenoid valve, causing a jam and resulting in flight failure. However, existing gas filters that control excess matter in the gas circuit often use a single-layer filter structure. For conventional helium booster pipelines, the gas filter can withstand pressure, but when a large flow of nitrogen is used as the gas source for the booster pipeline, the gas filter is difficult to support, often causing the filter to collapse and tear.

[0003] In the patent with publication number CN201930658U, entitled "A low-temperature bidirectional impact-resistant filter", although the filter is designed as a sealed welded integrated structure to reduce the risk of external leakage, the filter cannot be inspected and replaced before loading the rocket and flying, resulting in extremely poor filter maintenance and usability. In the patent with publication number CN218608613U, entitled "A high-pressure gas filter", the detachable design of the filter element solves the problem of filter inspection and replacement, but the skeleton-free filter element is difficult to ensure the pressure-bearing capacity of the skeleton-free filter element during the filtering process of high-flow nitrogen as the gas source for the boost pipeline, which often causes the filter to collapse and tear.

[0004] Therefore, how to improve the pressure-bearing capacity of the filter in the large-flow booster pipeline and realize the inspection and replacement of the filter before rocket loading and flight is a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0005] The present application provides a high-pressure gas bidirectional filter to improve the pressure-bearing capacity of the filter in a large-flow booster pipeline, and to realize the inspection and replacement of the filter before rocket loading and flight.

[0006] In order to solve the above technical problems, this application provides the following technical solutions:

[0007] A high-pressure gas bidirectional filter comprises: a shell, a fixed cover, a filter screen and a skeleton; wherein the shell has a valve core cavity inside, a medium inlet at the lower end of the shell, the medium inlet is connected to the valve core cavity, and the upper end of the shell has an assembly port, the assembly port is connected to the valve core cavity; the fixed cover has a medium flow cavity inside, the upper end of the fixed cover has a medium outlet, the medium outlet is connected to the medium flow cavity, the lower end of the fixed cover has an open port, the open port is connected to the medium flow cavity, and the lower end of the fixed cover has a fixed boss with an outer circumferential surface concave inwardly; the skeleton comprises: a hollow cylinder and a conical baffle; the large end of the conical baffle is fixedly docked with the lower end of the hollow cylinder, the upper end of the hollow cylinder is plugged and fixed to the fixed boss, and the hollow cylinder has a plurality of ventilation holes that pass through the inside and outside, and the filter screen is wrapped and fixed to the outer circumferential surface of the hollow cylinder; the lower section of the fixed cover is inserted from the assembly port into the upper part of the valve core cavity, and is detachably connected to the shell, and a plurality of retaining rings and a plurality of sealing rings are provided between the lower section of the fixed cover and the inner wall of the upper part of the valve core cavity.

[0008] As described above, in the high-pressure gas two-way filter, preferably, the inner wall of the valve core cavity has an internal thread near the assembly port, and the outer peripheral surface of the fixed cover near the lower end has a fastening external thread, and the fastening external thread cooperates with the internal thread to achieve a detachable connection between the shell and the fixed cover.

[0009] In the high-pressure gas bidirectional filter as described above, preferably, the outer peripheral surface of the shell has a shell adjustable wrench fixing portion protruding outward, and the outer peripheral surface of the fixing cover has a fixing cover adjustable wrench fixing portion protruding outward.

[0010] As described above, in the high-pressure gas two-way filter, preferably, a shell lead sealing hole is provided on the shell adjustable wrench fixing part, and the boost pipeline at this end is lead-sealed and fixed by passing a steel wire through the shell lead sealing hole; a fixing cover lead sealing hole is provided on the fixing cover adjustable wrench fixing part, and the boost pipeline at this end is lead-sealed and fixed by passing a steel wire through the fixing cover lead sealing hole.

[0011] As described above, in the high-pressure gas bidirectional filter, preferably, the outer peripheral surface of the shell has a concave clamp fixing position.

[0012] In the high-pressure gas bidirectional filter as described above, preferably, there is a transition slope between the two ends of the clamp fixing position and the parts connected thereto.

[0013] In the high-pressure gas bidirectional filter as described above, preferably, the outer peripheral surface of the fixed cover has a plurality of sealing grooves, and the sealing grooves are located below the fastening external threads, and the retaining ring and the sealing ring are located in the sealing grooves.

[0014] In the high-pressure gas bidirectional filter as described above, preferably, the sealing ring is closer to the lower end of the fixed cover than the retaining ring.

[0015] As described above, in the high-pressure gas bidirectional filter, preferably, the outer diameter of the large end of the conical baffle is larger than the outer diameter of the lower end of the hollow cylinder, and a recess is formed at the junction of the conical baffle and the hollow cylinder to provide an installation position for the lower end of the filter.

[0016] As described above, in the high-pressure gas bidirectional filter, preferably, the lower end of the filter is fixed to the hollow cylinder through a first weld I, and the upper end of the filter is fixed to the fixed boss together with the upper end of the hollow cylinder through a second weld II.

[0017] Beneficial effects:

[0018] 1. When the booster pipeline is nitrogen or conventional gas, the gas property is a low dew point medium, and the gas flow rate is ≥1Kg / s, the filter is often blocked due to partial frost on the filter, resulting in an increase in the pressure difference before and after the filter. In the past, the filter element was not sufficient to withstand the gas impact under this pressure difference, which easily caused the filter to be flattened, damaged, etc. The hollow cylinder and conical baffle of the high-pressure gas two-way filter skeleton of the present application are designed as a whole, and a ventilation hole is designed on the hollow cylinder. The outer layer is welded by electron beam welding to weld the filter to the skeleton and the filter, skeleton and fixed cover to solve the problem that the filter has insufficient pressure bearing capacity and cannot withstand the impact of large flow media.

[0019] 2. The existing two-way filter must be easy to inspect and replace. In order to solve this problem, the present application uses multiple sealing rings and retaining rings to form a multiple sealing system. After sealing, the sealing cover is connected to the shell through a thread, which is convenient for disassembly, inspection and replacement.

[0020] 3. In order to be suitable for the boosting system under aerospace vibration levels and prevent the threaded connection of the high-pressure gas two-way filter and the connection between the high-pressure gas two-way filter and the boosting pipeline from falling off, the present application provides a shell lead sealing hole at the shell adjustable wrench fixing part, and a fixed cover lead sealing hole at the fixed cover adjustable wrench fixing part. After the high-pressure gas two-way filter is installed in the boosting pipeline, it is fixed with a 1mm fine steel wire for lead sealing, thereby providing protection for the boosting pipeline from loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0022] Figure 1 is an exploded view of a high-pressure gas bidirectional filter provided in an embodiment of the present application;

[0023] Figure 2 is a cross-sectional view of a high-pressure gas bidirectional filter provided in an embodiment of the present application;

[0024] Figure 3 is a structural diagram of a housing of a high-pressure gas bidirectional filter provided in an embodiment of the present application;

[0025] Figure 4 It is a structural diagram of a fixed cover of a high-pressure gas bidirectional filter provided in an embodiment of the present application;

[0026] Figure 5 It is a structural diagram of the skeleton of the high-pressure gas bidirectional filter provided in the embodiment of the present application;

[0027] Figure 6 It is a structural diagram of the filter screen of the high-pressure gas bidirectional filter provided in an embodiment of the present application.

[0028] Among them, 1-shell; 11-medium inlet; 12-filter element cavity; 13-internal thread; 14-shell adjustable wrench fixing part; 15-clamp fixing position; 16-shell lead sealing hole; 17-transition slope; 2-fixing cover; 21-fastening external thread; 22-retaining ring; 23-sealing ring; 24-open; 25-medium outlet; 26-fixing cover lead sealing hole; 27-fixing cover adjustable wrench fixing part; 28-fixing boss; 29-sealing groove; 3-filter screen; 4-skeleton; 41-hollow cylinder; 42-ventilation circular hole; 43-conical baffle; 44-concave platform. DETAILED DESCRIPTION

[0029] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. In addition, spatial relationship terms such as "upper", "lower", "left", "right", "front", "back", etc. are used to facilitate the description to explain the positional relationship between two components. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and are not to be construed as limitations on the present application.

[0030] like Figure 1 and Figure 2 As shown, the present application provides a high-pressure gas bidirectional filter, including: a shell 1, a fixed cover 2, a filter screen 3 and a frame 4.

[0031] Among them, the shell 1 has a valve core cavity 12 inside, the lower end of the shell 1 has a medium inlet 11, the medium inlet 11 is connected to the valve core cavity 12, and is used for the medium to enter the valve core cavity 12. The upper end of the shell 1 has an assembly port, which is connected to the valve core cavity 12 and is used to load the skeleton 4 and the filter 3 into the valve core cavity 12.

[0032] Optionally, the inner wall of the valve core cavity 12 near the assembly port has an internal thread 13 for detachably connecting with the fixed cover 2 through a threaded connection. Also optionally, as Figure 3 As shown, the outer peripheral surface of the shell 1 has a shell wrench fixing portion 14 protruding outward, which is used to cooperate with the adjustable wrench to realize the assembly of the shell 1 and the fixed cover 2. Optionally, the shell wrench fixing portion 14 is a hexagonal adjustable wrench fixing portion. Optionally, the shell wrench fixing portion 14 is close to the end where the medium inlet 11 is located. Still optionally, a shell lead seal hole 16 is provided on the shell wrench fixing portion 14, which is used to seal the boosting pipeline at one end after the boosting pipeline is connected to the end where the medium inlet 11 is located, and to provide protection for the anti-loosening of the boosting pipeline. Preferably, the boosting pipeline is sealed with a steel wire with a diameter of 1 mm. Optionally, the shell lead seal holes 16 are provided on two adjacent faces of the shell wrench fixing portion 14 and are symmetrically distributed. Optionally, the outer peripheral surface of the housing 1 further has a concave clamp fixing position 15 for cooperating with the clamp, and after the high-pressure gas two-way filter is connected to the booster pipeline, it is fixed to other devices through the clamp. Still optionally, there is a transition slope 17 between the two ends of the clamp fixing position 15 and the part connected thereto.

[0033] The fixed cover 2 has a medium flow cavity inside, and the upper end of the fixed cover 2 has a medium outlet 25, which is connected to the medium flow cavity for the medium to flow out of the medium flow cavity. The lower end of the fixed cover 2 has an opening 24, which is connected to the medium flow cavity for the medium to enter the medium flow cavity after passing through the filter screen 3 and the frame 4. In addition, Figure 4 As shown, the lower end of the fixed cover 2 has a fixed boss 28 with an inwardly concave outer circumference, that is, the outer diameter of the fixed boss 28 is smaller than the outer diameter of other parts of the fixed cover 2, which is used to put the port of the hollow cylinder 41 of the skeleton 4 onto the fixed boss 28; and the lower section of the fixed cover 2 is inserted into the upper part of the valve core cavity 12 from the assembly port, and is detachably connected to the shell 1.

[0034] Optionally, the outer peripheral surface of the fixing cover 2 near the lower end has a fastening external thread 21, and the fastening external thread 21 cooperates with the internal thread 13 to achieve a detachable connection between the housing 1 and the fixing cover 2. Also optionally, as Figure 4As shown, the outer peripheral surface of the fixed cover 2 has a fixed cover wrench fixing portion 27 protruding outward, which is used to cooperate with the adjustable wrench to realize the assembly of the housing 1 and the fixed cover 2. Optionally, the fixed cover wrench fixing portion 27 is a hexagonal adjustable wrench fixing portion. Optionally, the fixed cover wrench fixing portion 27 is close to the end where the medium outlet 25 is located. Still optionally, a fixed cover lead sealing hole 26 is provided on the fixed cover wrench fixing portion 27, which is used to seal the boosting pipeline at this end after the boosting pipeline is connected to the end where the medium outlet 25 is located, and provide protection for the anti-loosening of the boosting pipeline. Preferably, the boosting pipeline is sealed with a steel wire with a diameter of 1 mm. Optionally, the fixed cover lead sealing holes 26 are provided on two adjacent faces of the fixed cover wrench fixing portion 27, and are symmetrically distributed.

[0035] In addition, there are multiple retaining rings 22 and multiple sealing rings 23 between the lower section of the fixed cover 2 and the inner wall of the upper part of the valve core cavity 12. The multiple retaining rings 22 and the multiple sealing rings 23 constitute a multiple sealing system to achieve compression sealing, which can reduce the risk of external leakage. At the same time, after sealing, a detachable (threaded) connection is used to facilitate disassembly, inspection and replacement.

[0036] Optionally, two retaining rings 22 and two sealing rings 23 are provided between the lower section of the fixed cover 2 and the inner wall of the upper part of the valve core cavity 12. Optionally, a plurality of sealing grooves 29 are provided on the outer peripheral surface of the fixed cover 2, and the sealing grooves 29 are located below the fastening external threads 21, and the retaining rings 22 and the sealing rings 23 are located in the sealing grooves 29. Optionally, the sealing ring 23 is closer to the lower end of the fixed cover than the retaining ring 22. Optionally, the sealing ring 23 is an O-type sealing ring.

[0037] The skeleton 4 includes: a hollow cylinder 41 and a conical baffle 43; the large end of the conical baffle 43 is fixedly docked with the lower end of the hollow cylinder 41, and the upper end of the hollow cylinder 41 is plugged and fixed to the fixed boss 28; the hollow cylinder 41 has a plurality of vent holes 42 that pass through the inside and outside for passing the medium; the filter screen 3 is wrapped and fixed to the outer peripheral surface of the hollow cylinder 41 for filtering excess matter in the medium.

[0038] Optionally, the conical baffle 43 is integrally formed with the hollow cylinder 41. Optionally, the vent holes 42 are evenly distributed on the hollow cylinder 41. Optionally, the outer diameter of the large end of the conical baffle 43 is larger than the outer diameter of the lower end of the hollow cylinder 41, so that a concave platform 44 is formed at the intersection of the conical baffle 43 and the hollow cylinder 41, providing a mounting position for the lower end of the filter 3. Optionally, the filter 3 is welded, and the extension direction of the weld is the same as the axial direction. Optionally, the lower end of the filter 3 is fixed to the hollow cylinder 41 through a first weld I, and the upper end of the filter 3 is fixed to the fixed boss 28 together with the upper end of the hollow cylinder 41 through a second weld II, so that the filter 3, the skeleton 4 and the fixed cover 2 are fixedly connected together, so that the filter 3 has a high pressure bearing capacity and can withstand the impact of a large flow (for example: 1Kg / s~3Kg / s) medium.

[0039] When assembling the high-pressure gas bidirectional filter of the present application, first, the filter screen 3 is put onto the outside of the hollow cylinder 41 of the skeleton 4, and then the hollow cylinder 41 of the skeleton 4 is inserted into the fixed boss 28 of the fixed cover 2. At the lower end of the filter screen 3, the filter screen 3 and the hollow cylinder 41 of the skeleton 4 are fixedly connected together by a first weld I. At the upper end of the filter screen 3 and the upper end of the hollow cylinder 41 of the skeleton 4, the filter screen 3 and the hollow cylinder 41 of the skeleton 4 are fixedly connected together with the fixed boss 28 of the fixed cover 2 by a second weld II; then the retaining ring 22 and the sealing ring 23 are installed in the sealing groove 29, and then the fixed cover 2 carrying the skeleton 4 and the filter screen 3 is screwed into the shell 1, thereby completing the assembly of the high-pressure gas bidirectional filter.

[0040] It is obvious to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present application. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0041] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high-pressure gas bidirectional filter, characterized in that: include: Shell, fixed cover, filter and frame; The shell has a valve core cavity inside, the lower end of the shell has a medium inlet, the medium inlet is connected to the valve core cavity, and the upper end of the shell has an assembly port, the assembly port is connected to the valve core cavity; The fixed cover has a medium flow cavity inside, the upper end of the fixed cover has a medium outlet, the medium outlet is connected to the medium flow cavity, the lower end of the fixed cover has an opening, the opening is connected to the medium flow cavity, and the lower end of the fixed cover has a fixed boss with an outer peripheral surface inwardly concave; The skeleton includes: a hollow cylinder and a conical baffle; the large end of the conical baffle is fixedly connected to the lower end of the hollow cylinder, the upper end of the hollow cylinder is plugged and fixed to the fixed boss, and the hollow cylinder has a plurality of ventilating circular holes that pass through the inside and outside, and the filter is wrapped and fixed to the outer peripheral surface of the hollow cylinder; The lower section of the fixed cover is inserted from the assembly port into the upper part of the valve core cavity and is detachably connected to the housing. A plurality of retaining rings and a plurality of sealing rings are provided between the lower section of the fixed cover and the inner wall of the upper part of the valve core cavity.

2. The high-pressure gas bidirectional filter according to claim 1, characterized in that: The inner wall of the valve core cavity is provided with an internal thread near the assembly port, and the outer peripheral surface of the fixed cover near the lower end is provided with a fastening external thread. The fastening external thread cooperates with the internal thread to achieve a detachable connection between the housing and the fixed cover.

3. The high-pressure gas bidirectional filter according to claim 1 or 2, characterized in that: The outer peripheral surface of the shell is provided with a shell movable wrench fixing portion protruding outwards, and the outer peripheral surface of the fixing cover is provided with a fixing cover movable wrench fixing portion protruding outwards.

4. The high-pressure gas bidirectional filter according to claim 3, characterized in that: A housing lead-sealing hole is provided on the housing spanner fixing part, and a steel wire is passed through the housing lead-sealing hole to lead-seal and fix the booster pipeline at that end; A fixing cover lead sealing hole is provided on the fixing part of the fixing cover adjustable wrench, and the booster pipeline at that end is lead-sealed and fixed by passing a steel wire through the fixing cover lead sealing hole.

5. The high-pressure gas bidirectional filter according to claim 1 or 2, characterized in that: The outer peripheral surface of the shell is provided with a concave clamp fixing position.

6. The high-pressure gas bidirectional filter according to claim 5, characterized in that: There are transition slopes between the two ends of the clamp fixing position and the parts connected thereto.

7. The high-pressure gas bidirectional filter according to claim 1 or 2, characterized in that: The outer peripheral surface of the fixed cover is provided with a plurality of sealing grooves, and the sealing grooves are located below the fastening external threads, and the retaining ring and the sealing ring are located in the sealing grooves.

8. The high-pressure gas bidirectional filter according to claim 7, characterized in that: The sealing ring is closer to the lower end of the fixed cover than the retaining ring.

9. The high-pressure gas bidirectional filter according to claim 1 or 2, characterized in that: The outer diameter of the large end of the conical baffle is larger than the outer diameter of the lower end of the hollow cylinder, and a concave platform is formed at the intersection of the conical baffle and the hollow cylinder to provide an installation position for the lower end of the filter screen.

10. The high-pressure gas bidirectional filter according to claim 1 or 2, characterized in that: The lower end of the filter screen is fixed to the hollow cylinder through a first weld seam I, and the upper end of the filter screen and the upper end of the hollow cylinder are fixed to the fixed boss through a second weld seam II.

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