High-pressure and low-temperature two-way filter

Abstract

The present invention provides a high-pressure, low-temperature bidirectional filter, comprising a filter body comprising a first hollow structure with openings at both ends, a mesh mounting frame comprising a second hollow structure with openings at both ends, at least a portion of the outer peripheral surface of the mesh mounting frame being connected to the inner wall surface of the filter body, a sintered filter screen comprising a barrel-shaped structure with an opening at one end, the open end of the sintered filter screen being connected to one end of the mesh mounting frame and arranged in communication with the second hollow structure, the outer surface of the sintered filter screen being arranged at a distance from the inner wall surface of the filter body, a low-temperature medium being able to enter the first hollow structure along the first end of the filter body, be filtered by the sintered filter screen, and then flow out from the second end of the filter body, or the low-temperature medium being able to enter the sintered filter screen along the second end of the filter body, be filtered by the sintered filter screen, and then flow out from the first end of the filter body, effectively improving the service life and safety performance of the high-pressure, low-temperature bidirectional filter.

Description

Technical Field

[0001] The present invention relates to the technical field of filtering equipment, in particular to a high-pressure and low-temperature bidirectional filter. Background Art

[0002] In the cryogenic rocket test system, filters are used to prevent excess matter from entering the test product. However, the filters used in the system are all one-way filtration devices, which only allow the cryogenic medium to flow in one direction. When the medium flows in the reverse direction, the filter screen will be broken. In order to ensure that the cryogenic medium does not accumulate in the conveying pipeline and the test product during the product disassembly and assembly process, high-pressure reverse blowing is necessary. The original filter screen structure cannot withstand the reverse impact. The original filter uses a flat gasket structure, which is prone to leakage under the high pressure in the liquid nitrogen temperature zone. The original woven filter screen is directly welded to the filter element frame and is easily damaged under the reverse high-pressure impact.

[0003] Existing filter elements utilize a wire mesh welded to a frame, sealed with F4 seals or soft aluminum gaskets. The main drawback of this technology is that it cannot withstand bidirectional fluid impact and can only flow in the direction of the fluid flow, otherwise the metal mesh will break. Furthermore, the fluid is prone to leakage under low temperatures and high pressures, resulting in low reliability. Summary of the Invention

[0004] The main purpose of the present invention is to provide a high-pressure, low-temperature, two-way filter to solve the problem that the filter screen is easily damaged in the prior art;

[0005] To achieve the above-mentioned object, according to one aspect of the present invention, there is provided a high-pressure, low-temperature bidirectional filter, comprising: a filter body, the filter body being a first hollow structure with openings at both ends; a filter screen mounting frame, the filter screen mounting frame being a second hollow structure with openings at both ends, at least a portion of the outer peripheral surface of the filter screen mounting frame being connected to the inner wall surface of the filter body; a sintered filter screen, the sintered filter screen being a barrel-shaped structure with an open end, the open end of the sintered filter screen being connected to one end of the filter screen mounting frame and being arranged in communication with the second hollow structure, the outer surface of the sintered filter screen being arranged at a distance from the inner wall surface of the filter body; wherein a low-temperature medium can enter the first hollow structure along the first end of the filter body, be filtered by the sintered filter screen, and then flow out from the second end of the filter body, and the low-temperature medium can also enter the sintered filter screen along the second end of the filter body through the second hollow structure, be filtered by the sintered filter screen, and then flow out through the first end of the filter body;

[0006] Furthermore, the filter body includes: a first component segment, wherein the first end of the first component segment forms the first end of the filter body, and an inlet flange is provided on the outer circumferential surface of the first component segment; a second component segment, wherein the first end of the second component segment is connected to the second end of the first component segment; a third component segment, wherein the first end of the third component segment is connected to the second end of the second component segment, and the second end of the third component segment forms the second end of the filter body, and an outlet flange is provided on the outer circumferential surface of the third component segment, the first component segment, the second component segment and the third component segment are coaxially arranged, and the axis of the sintered filter screen extends along the axis direction of the first component segment;

[0007] Furthermore, a first limiting step is provided on the inner circumference of the second end of the filter body, an annular sealing cavity is formed between the filter screen mounting frame and the table surface of the first limiting step, and a pan seal sealing portion is provided in the annular sealing cavity;

[0008] Furthermore, a second limiting step is provided on the inner circumferential surface of the second end of the filter body, and the second limiting step is located outside the first limiting step. The filter screen mounting frame is provided with a sealing step, and the step surface of the sealing step abuts against the step surface of the second limiting step.

[0009] Furthermore, the pan-seal sealing portion includes: a stainless steel spring, which is arranged in the annular sealing cavity; a polytetrafluoroethylene sealing ring, which is arranged in the annular sealing cavity and located on the outside of the stainless steel spring, and the stainless steel spring and the polytetrafluoroethylene sealing ring are both sleeved on the filter mounting frame;

[0010] Furthermore, the filter screen mounting frame is threadedly connected to the filter body;

[0011] By applying the technical solution of the present invention, by installing a sintered filter screen within the filter body, the high-pressure, low-temperature bidirectional filter not only allows the normal passage of low-temperature media in the forward direction, but also ensures that the sintered filter screen will not be broken during the high-pressure reverse flow to remove the low-temperature media. This effectively improves the service life and safety performance of the high-pressure, low-temperature bidirectional filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0013] Figure 1 A schematic cross-sectional view of an embodiment of a high-pressure, low-temperature, bidirectional filter according to the present invention is shown. DETAILED DESCRIPTION

[0014] It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments;

[0015] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprising" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations;

[0016] It should be noted that the terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable under appropriate circumstances, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products or apparatuses;

[0017] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of this application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those skilled in the art. In the accompanying drawings, for the sake of clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0018] Combine Figure 1As shown, according to a specific embodiment of the present application, a high-pressure, low-temperature bidirectional filter is provided. The high-pressure, low-temperature bidirectional filter includes a filter body 7, a filter screen mounting skeleton 6 and a sintered filter screen 2. The filter body 7 is a first hollow structure 71 with openings at both ends. The filter screen mounting skeleton 6 is a second hollow structure 61 with openings at both ends, and at least part of the outer peripheral surface of the filter screen mounting skeleton 6 is connected to the inner wall surface of the filter body 7. The sintered filter screen 2 is a barrel-shaped structure with one end open, and the open end of the sintered filter screen 2 is connected to one end of the filter screen mounting skeleton 6 and is arranged in communication with the second hollow structure 61. The outer surface of the sintered filter screen 2 is arranged at a distance from the inner wall surface of the filter body 7. In particular, the low-temperature medium can enter the first hollow structure 71 along the first end of the filter body 7, be filtered by the sintered filter screen 2, and then flow out from the second end of the filter body 7, and the low-temperature medium can also enter the sintered filter screen 2 through the second hollow structure 61 along the second end of the filter body 7, be filtered by the sintered filter screen 2, and then flow out through the first end of the filter body 7;

[0019] In this embodiment, by installing a sintered filter screen 2 within the filter body 7, the high-pressure, low-temperature bidirectional filter not only allows the normal passage of low-temperature media in the forward direction, but also ensures that the sintered filter screen 2 will not be broken during the high-pressure reverse flow to remove the low-temperature media. This effectively improves the service life and safety of the high-pressure, low-temperature bidirectional filter.

[0020] Wherein, the filter body 7 includes a first component segment, a second component segment and a third component segment. The first end of the first component segment forms the first end of the filter body 7, and an inlet flange 1 is provided on the outer peripheral surface of the first component segment. The first end of the second component segment is connected to the second end of the first component segment. The first end of the third component segment is connected to the second end of the second component segment, and the second end of the third component segment forms the second end of the filter body 7. An outlet flange 4 is provided on the outer peripheral surface of the third component segment, and the first component segment, the second component segment and the third component segment are coaxially arranged, and the axis of the sintered filter screen 2 extends along the axial direction of the first component segment. Such an arrangement can reduce the processing difficulty of the filter body 7, and welding can be used between the first component segment, the second component segment and the third component segment. Such an arrangement can improve the connection strength of the filter body 7;

[0021] In order to improve the sealing performance of the filter body, a first limiting step 72 is provided on the inner circumference of the second end of the filter body 7, and an annular sealing cavity is formed between the filter screen mounting skeleton 6 and the table surface of the first limiting step 72, and a pan-seal sealing portion 5 is provided in the annular sealing cavity. A second limiting step 73 is provided on the inner circumference of the second end of the filter body 7, and the second limiting step 73 is located on the outside of the first limiting step 72. The filter screen mounting skeleton 6 is provided with a sealing step 61, and the step surface of the sealing step 61 abuts against the step surface of the second limiting step 73. Specifically, the pan-seal sealing portion 5 includes a stainless steel spring and a polytetrafluoroethylene sealing ring. The stainless steel spring is arranged in the annular sealing cavity. The polytetrafluoroethylene sealing ring is arranged in the annular sealing cavity and is located on the outside of the stainless steel spring. The stainless steel spring and the polytetrafluoroethylene sealing ring are both sleeved on the filter screen mounting skeleton 6. The filter screen mounting skeleton 6 is threadedly connected to the filter body 7;

[0022] In this application, the high-pressure and low-temperature bidirectional filter provided adopts a metal sintered filter screen with high strength, strong pressure resistance, uniform structure, high porosity, low filtration resistance, good permeability, strong low-temperature resistance, high hardness, and strong anti-impact tolerance; at the same time, a pan-seal combined sealing method is adopted to ensure sealing reliability;

[0023] This high-pressure, low-temperature, bidirectional filter is a low-temperature, bidirectional, impact-resistant filter that achieves bidirectional flow in low-temperature, high-pressure test systems, provides excellent external sealing, and is impact-resistant under high pressure. The filter consists of an inlet flange, a sintered filter screen, a filter body assembly, an outlet flange, a shim seal, and a filter mounting frame. First, the sintered filter screen and mounting frame are electron beam welded together to form the filter element. Next, the inlet flange, filter body assembly, and outlet flange are electron beam welded together in sequence. The shim seal assembly is then installed into the sealing groove (or sealing cavity) of the outlet flange, and the welded filter element is threadedly secured to the outlet flange.

[0024] Since the filter housing adopts a welded structure, the seal between the filter element and the housing adopts a pan-seal combination seal. The outer sleeve of the seal is made of polytetrafluoroethylene, and the internal stainless steel spring provides pressure for the external seal, so that the sealing sleeve is always tightly pressed against the sealing contact surface to prevent leakage. It can also seal well when the internal pressure is low. When the internal pressure is high, the opening is widened to ensure better sealing.

[0025] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the figures is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be subsequently positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein shall be interpreted accordingly;

[0026] In addition to the above, it should be noted that the references to "one embodiment," "another embodiment," "an embodiment," etc. in this specification refer to specific features, structures, or characteristics described in conjunction with that embodiment as included in at least one embodiment generally described in this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in conjunction with any embodiment, it is claimed that the realization of such feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of the present invention.

[0027] In the above embodiments, the description of each embodiment has its own focus. For parts not described in detail in one embodiment, please refer to the relevant description of other embodiments.

[0028] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A high-pressure, low-temperature, two-way filter, characterized in that: include: A filter body (7), wherein the filter body (7) is a first hollow structure (71) having openings at both ends; A filter screen mounting frame (6), the filter screen mounting frame (6) being a second hollow structure (61) with openings at both ends, and at least a portion of the outer peripheral surface of the filter screen mounting frame (6) being connected to the inner wall surface of the filter body (7); a sintered filter screen (2), the sintered filter screen (2) being a barrel-shaped structure with one end open, the open end of the sintered filter screen (2) being connected to one end of the filter screen mounting frame (6) and being arranged in communication with the second hollow structure (61), and the outer surface of the sintered filter screen (2) being arranged at a distance from the inner wall surface of the filter body (7); wherein the low-temperature medium can enter the first hollow structure (71) along the first end of the filter body (7), be filtered by the sintered filter screen (2), and then flow out from the second end of the filter body (7); and the low-temperature medium can also enter the sintered filter screen (2) along the second end of the filter body (7) through the second hollow structure (61), be filtered by the sintered filter screen (2), and then flow out through the first end of the filter body (7); The inner circumference of the second end of the filter body (7) is provided with a first limiting step (72), an annular sealing cavity is formed between the filter screen mounting frame (6) and the table surface of the first limiting step (72), and a pan-seal sealing portion (5) is provided in the annular sealing cavity; The pan-seal sealing portion (5) comprises: a stainless steel spring disposed in the annular sealing cavity; A polytetrafluoroethylene sealing ring is arranged in the annular sealing cavity and located outside the stainless steel spring. The stainless steel spring and the polytetrafluoroethylene sealing ring are both sleeved on the filter screen mounting frame (6).

2. The high-pressure and low-temperature bidirectional filter according to claim 1, characterized in that: The filter body (7) comprises: a first component segment, wherein a first end of the first component segment forms a first end of the filter body (7), and an inlet flange (1) is provided on an outer peripheral surface of the first component segment; a second component segment, wherein a first end of the second component segment is connected to a second end of the first component segment; A third component segment, wherein the first end of the third component segment is connected to the second end of the second component segment, the second end of the third component segment forms the second end of the filter body (7), the outer peripheral surface of the third component segment is provided with an outlet flange (4), the first component segment, the second component segment and the third component segment are coaxially arranged, and the axis of the sintered filter screen (2) extends along the axial direction of the first component segment.

3. The high-pressure and low-temperature bidirectional filter according to claim 1, characterized in that: The inner circumferential surface of the second end of the filter body (7) is provided with a second limiting step (73), and the second limiting step (73) is located outside the first limiting step (72). The filter screen mounting frame (6) is provided with a sealing step, and the step surface of the sealing step abuts against the step surface of the second limiting step (73).

4. The high-pressure and low-temperature bidirectional filter according to claim 1, characterized in that: The filter screen mounting frame (6) is threadedly connected to the filter body (7).

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