A contamination indicator for a filter

Abstract

The application provides a pollution indicator for a filter, comprising a shell, a piston, an elastic piece, a push rod and an indicating assembly, wherein the shell comprises a first chamber and a second chamber, the first chamber and the second chamber are communicated through a communication hole, the first chamber comprises a low-pressure chamber and a high-pressure chamber; the piston is slidingly arranged in the first chamber, the peripheral surface of the piston is in contact with the peripheral wall surface of the first chamber, so as to divide the first chamber into the high-pressure chamber and the low-pressure chamber; the elastic piece is arranged in the low-pressure chamber, one end of the push rod is connected with the piston, and the other end of the push rod enters the second chamber through the communication hole; the indicating assembly is arranged in the second chamber, wherein at least a part of the indicating assembly can move in the direction away from the first chamber under the pushing of the push rod. The pollution indicator provided by the application has the advantages of simpler structure, more convenient observation, stronger applicability, lower manufacturing cost, and the like, and the movement state of the indicating assembly after the filter is polluted can be used to judge whether the filter element is blocked.

Description

Technical Field

[0001] This invention relates to the field of differential pressure signal technology, and more specifically, to a contamination indicator for a filter. Background Technology

[0002] Filters help remove impurities from hydraulic systems and are key components ensuring the normal operation of these systems. During use, it's crucial to monitor filter clogging levels promptly for timely cleaning or filter element replacement. Furthermore, filter clogging can cause downstream actuators to slow down or even stop operating, leading to decreased system efficiency or even shutdown. Therefore, monitoring the filter's operating status is essential to ensure timely replacement of the filter element when clogging occurs.

[0003] In existing technologies, people generally understand the clogging status of a filter by observing the reading of a pressure gauge installed in front of the filter. However, since the pressure in the pipeline in front of the filter is also affected by other factors such as the operation of pumps, the pressure in front of the filter alone does not fully reflect the working status of the filter itself. Only the change in the pressure difference ΔP before and after the filter truly reflects the degree of clogging.

[0004] However, the current contamination indicators measure the pressure at the inlet and outlet of the filter and reflect the pressure difference between the inlet and outlet to the displacement of the piston. The pressure difference reflects the clogging status of the filter. However, in confined and harsh environments such as coal mines, it is difficult to install pressure sensors or pressure gauges. The sensors have a short service life, and it is costly to equip one filter with two pressure detection devices. At the same time, the structure is relatively complex, and it is difficult to reset the indicator. Removing the indicator to reset it may cause secondary contamination to the hydraulic system, affecting the service life of the hydraulic system.

[0005] Therefore, existing technologies suffer from technical problems such as complex indicator structures, difficulty in resetting, and inability to adapt to harsh environments. Summary of the Invention

[0006] The main objective of this invention is to provide a contamination indicator for filters, thereby solving the technical problems of existing indicators having complex structures, difficult reset, and poor adaptability to harsh environments.

[0007] To achieve the above objectives, the present invention provides a contamination indicator for a filter, comprising:

[0008] A housing, the housing including a first chamber and a second chamber, wherein the first chamber and the second chamber are connected through a connecting hole, the first chamber including a low-pressure chamber and a high-pressure chamber, the housing including a first opening and a second opening, wherein the high-pressure chamber is connected to the outside through the first opening, and the low-pressure chamber is connected to the outside through the second opening;

[0009] A piston is slidably disposed within the first chamber, with its circumferential surface in contact with the circumferential wall of the first chamber, thereby dividing the first chamber into the high-pressure chamber and the low-pressure chamber.

[0010] An elastic element is disposed in the low-pressure chamber, one end of the elastic element is connected to the piston, and the other end of the elastic element is connected to the wall of the housing;

[0011] A push rod, one end of which is connected to the piston, and the other end of which passes through the connecting hole into the second chamber;

[0012] An indicator assembly disposed within the second chamber, wherein at least a portion of the indicator assembly is movable away from the first chamber upon being pushed by the push rod.

[0013] Furthermore, the indicating component includes a nut disposed in the second cavity and fixedly connected to the housing, the nut having a receiving cavity in the middle for the push rod to slide through, the receiving cavity extending through the nut; and a push rod slidably disposed in the receiving cavity, one end of the push rod abutting against the push rod and being able to move away from the first cavity within the receiving cavity under the push of the push rod.

[0014] Furthermore, the inner circumferential surface of the receiving cavity is provided with a first annular groove, and a first sealing ring is provided in the first annular groove, the first sealing ring abutting against the outer circumferential surface of the push rod; the end face of the nut near the first chamber is provided with a second annular groove, and a second sealing ring is provided in the second annular groove, the second sealing ring abutting against the inner wall surface of the housing.

[0015] Furthermore, the receiving cavity includes a first section and a second section, wherein the inner diameter of the first section is smaller than the inner diameter of the second section, thereby forming a stepped hole structure, and one end of the push rod has a locking platform, the outer periphery of which contacts the inner wall of the second section.

[0016] Furthermore, the inner circumferential surface of the first segment is provided with a third annular groove, and a third sealing ring is provided in the third annular groove, the third sealing ring being in contact with the outer circumferential surface of the top rod.

[0017] Furthermore, the piston has a mounting hole, one end of the push rod is fixedly connected to the mounting hole, the push rod is provided with a damping hole, and the low-pressure chamber communicates with the second opening through the damping hole and the mounting hole.

[0018] Furthermore, the piston also has a through hole arranged perpendicular to the axis of the housing, and the low-pressure chamber communicates with the second opening through the damping hole, the mounting hole and the through hole.

[0019] Furthermore, the outer peripheral surface of the housing is provided with external threads, and the housing is screwed to the valve body of the filter through the external threads.

[0020] Furthermore, the pollution indicator includes a valve seat that communicates with the side of the housing away from the second chamber, and the inner cavity of the valve seat and one side of the piston together form the high-pressure chamber.

[0021] Furthermore, the outer circumferential surface of the piston is provided with a fourth annular groove, and a fourth sealing ring is provided in the fourth annular groove, the fourth sealing ring being in contact with the inner circumferential surface of the first chamber.

[0022] The filter contamination indicator provided in this disclosure adopts a plug-in structure, with the indicating component housed in the second chamber. This results in a more compact structure. When the filter becomes clogged, the increased pressure difference between the inlet and outlet pushes a piston, which in turn moves the indicating component via a push rod, indicating filter element blockage. Compared to existing solutions, this solution provides a more obvious effect and is convenient for use in working environments with poor lighting conditions, such as underground coal mines. Furthermore, the contamination indicator provided in this disclosure has a simpler structure, is easier to observe, and has wider applicability. The movement of the indicating component after filter contamination can determine whether the filter element is clogged, and the manufacturing cost is lower. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0024] Figure 1 A schematic diagram of a contamination indicator for a filter according to the present invention is shown.

[0025] The above figures include the following reference numerals:

[0026] 10. Housing; 11. First chamber; 12. Second chamber; 13. External thread; 14. Sealing gasket; 20. Piston; 21. Fourth sealing ring; 30. Elastic element; 40. Push rod; 41. Damping hole; 50. Indicating assembly; 51. Nut; 52. Push rod; 53. First sealing ring; 54. Second sealing ring; 55. Third sealing ring; 60. Valve seat; 61. Fifth sealing ring. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0029] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0030] To address the technical problems of complex indicator structures, difficult resetting, and poor adaptability to harsh environments in existing technologies, this invention provides a contamination indicator for filters.

[0031] like Figure 1As shown, this disclosure provides a contamination indicator for a filter, the contamination indicator including a housing 10, a piston 20, an elastic element 30, a push rod 40, and an indicator assembly 50, wherein the housing 10 includes a first chamber 11 and a second chamber 12, the first chamber 11 and the second chamber 12 being connected through a connecting hole, thereby providing different receiving spaces through the first chamber 11 and the second chamber 12, the first chamber 11 including a low-pressure chamber and a high-pressure chamber, the housing 10 including a first opening and a second opening, wherein the high-pressure chamber is connected to the outside through the first opening, and the low-pressure chamber is connected to the outside through the second opening. The piston 20 is slidably disposed within the first chamber 11, with its outer peripheral surface in contact with the inner peripheral wall of the first chamber 11, thereby dividing the first chamber 11 into the high-pressure chamber and the low-pressure chamber. An elastic element 30 is disposed within the low-pressure chamber, with one end abutting against the piston 20 and the other end abutting against the wall of the housing 10, thus providing a restoring force to the piston 20. One end of the push rod 40 is connected to the piston 20, and the other end passes through the connecting hole into the second chamber 12. An indicating component 50 is disposed within the second chamber 12, wherein at least a portion of the indicating component 50 can move away from the first chamber 11 under the push of the push rod 40, thereby indicating the degree of contamination of the filter by the distance the indicating component 50 moves away from the first chamber 11.

[0032] Specifically, the elastic element 30 can be a spring, with one end of the spring abutting against the piston 20 and the other end of the spring abutting against the wall of the housing 10, so as to facilitate the reset of the piston 20.

[0033] The filter contamination indicator provided in this disclosure adopts a plug-in structure, with the indicating component 50 housed within the second chamber 12. This results in a more compact structure. When the filter becomes clogged, the increased pressure difference between the inlet and outlet pushes the piston 20, which in turn moves the indicating component 50 via the push rod 40, indicating filter element clogging. Compared to existing solutions, this solution provides a more obvious effect and is convenient for use in working environments with poor lighting conditions, such as underground coal mines. Furthermore, the contamination indicator provided in this disclosure has a simpler structure, is easier to observe, and has wider applicability. The movement of the indicating component 50 after filter contamination indicates whether the filter element is clogged, and the manufacturing cost is lower.

[0034] Furthermore, the indicating component 50 includes a nut 51 and a push rod 52. The nut 51 is disposed in the second chamber 12 and can be fixedly connected to the housing 10. The nut 51 has a receiving cavity in the middle for the push rod 40 to slide. The receiving cavity is disposed through the nut 51, so that the push rod 40 can extend into the receiving cavity from the first chamber 11 through the communicating hole. The push rod 52 is slidably disposed in the receiving cavity. One end of the push rod 52 can abut against the push rod 40 and can move in the receiving cavity away from the first chamber 11 under the push of the push rod 40. Since the top rod 52 and the push rod 40 are separate structures, the top rod 52 can only move away from the first chamber 11 under the push of the push rod 40, and cannot move closer to the first chamber 11. This means that the position of the top rod 52 can only move further and further away from the first chamber 11. In other words, the distance by which the top rod 52 protrudes from the nut 51 can only increase, thus making it easier to indicate the contamination status of the filter.

[0035] Preferably, the cross-section of the end face of the top rod 52 that abuts against the push rod 40 can be different from the cross-section of the push rod 40, thereby reducing the difficulty of processing and installation; in this embodiment, the cross-section of the end face of the top rod 52 that abuts against the push rod 40 is greater than or equal to the cross-section of the push rod 40, thereby facilitating assembly and installation while also facilitating the sealing and fixing of the top rod 52.

[0036] To improve the accuracy of the indicating device, a first annular groove is provided on the inner circumferential surface of the receiving cavity, and a first sealing ring 53 is provided in the first annular groove. The first sealing ring 53 abuts against the outer circumferential surface of the push rod 40, thereby improving the sealing between the push rod 40 and the receiving cavity of the nut 51. At the same time, the friction between the push rod 52 and the sealing ring also prevents the push rod 52 from malfunctioning. A second annular groove is provided on the end face of the nut 51 near the first chamber 11, and a second sealing ring 54 is provided in the second annular groove. The second sealing ring 54 abuts against the inner wall surface of the housing 10, further improving the sealing between the end face of the nut 51 and the push rod 40.

[0037] In another embodiment of this disclosure, the receiving cavity includes a first section and a second section, wherein the inner diameter of the first section is smaller than the inner diameter of the second section, thereby forming a stepped hole structure on the inner surface of the receiving cavity. The end of the push rod 52 that abuts against the push rod 40 is provided with a locking platform. The outer periphery of the locking platform contacts the inner wall of the second section, thereby sealing the second section through the locking platform. At the same time, the side of the locking platform away from the second chamber 12 can be locked with the stepped hole, thereby preventing the push rod 52 from coming out of the receiving cavity.

[0038] Furthermore, the inner circumferential surface of the first segment is provided with a third annular groove, and a third sealing ring 55 is provided in the third annular groove. The third sealing ring 55 contacts the outer circumferential surface of the push rod 52, thereby improving the sealing between the push rod 52 and the nut 51. At the same time, it can also fix the position of the push rod 52 and prevent accidental contact with the push rod 52 from affecting it.

[0039] In another embodiment disclosed herein, the piston 20 has a mounting hole, one end of the push rod 40 is fixedly connected to the mounting hole, and the push rod 40 is provided with a damping hole 41. The low-pressure chamber communicates with the second opening through the damping hole 41 and the mounting hole, thereby preventing filter blockage and vibration generated when the piston 20 moves through the damping hole 41.

[0040] Specifically, the damping hole 41 is arranged radially along the push rod 40, and multiple damping holes 41 can be provided. The push rod 40 is provided with a connecting hole that communicates with the mounting hole of the piston 20. The damping hole 41 communicates with the mounting hole through the connecting hole. The piston 20 is also provided with a through hole arranged perpendicular to the axis of the housing 10. The low-pressure chamber communicates with the second opening through the damping hole 41, the mounting hole, and the through hole.

[0041] Furthermore, the outer peripheral surface of the housing 10 is provided with an external thread 13, and the housing 10 is screwed to the valve body of the filter through the external thread 13. The housing 10 and the filter are fixed by the threaded connection, which is convenient to process and easy to install. At the same time, by controlling the depth of the thread screwing in, the compression of the elastic element 30 located in the low pressure chamber can be adjusted, thereby adjusting the trigger pressure differential force of the pollution indicator.

[0042] Specifically, a sealing gasket 14 is also provided on the housing 10. The sealing gasket 14 is located on the contact surface where the housing 10 abuts against the valve body of the filter, thereby improving the sealing performance between the housing 10 and the filter.

[0043] In another embodiment of this disclosure, the pollution indicator further includes a valve seat 60, which communicates with the side of the housing 10 away from the second chamber 12. Specifically, one end of the valve seat 60 abuts against the side of the housing 10 away from the second chamber 12, and one end of the piston 20 away from the second chamber 12 can abut against the valve seat 60. The valve seat 60 is provided with an abutting surface for abutting against the piston 20. The inner cavity of the valve seat 60 and one end face of the piston 20 together form the high-pressure chamber.

[0044] Furthermore, a fourth annular groove is provided on the outer peripheral surface of the piston 20, and a fourth sealing ring 21 is provided in the fourth annular groove. The fourth sealing ring 21 contacts the inner peripheral surface of the first chamber 11. This improves the sealing performance between the piston 20 and the housing 10. The fourth sealing ring 21 prevents high-pressure liquid from leaking into the first chamber 11.

[0045] Preferably, the outer peripheral surface of the valve seat 60 is provided with a fifth annular groove, and a fifth sealing ring 61 is provided in the fifth annular groove. The fifth sealing ring 61 contacts the inner peripheral surface of the filter valve body, thereby improving the sealing performance between the pollution indicator and the filter valve body.

[0046] The contamination indicator provided in this disclosure is installed in the valve body of the filter via threads on the housing 10 during use. The piston 20 divides the first chamber 11 inside the housing 10 into a low-pressure chamber and a high-pressure chamber. An elastic element 30 is located in the low-pressure chamber and communicates with the filter outlet. The right end of the valve seat 60 communicates with the high-pressure chamber and the filter inlet. When the filter element is not clogged, the piston 20 presses against the valve seat 60 under the elastic force of the elastic element 30, separating the high-pressure and low-pressure chambers. When the filter element is clogged, the pressure difference between the high-pressure and low-pressure chambers increases, causing the piston 20 to move to the left against the elastic force. The push rod 40 pushes the top rod 52 out, thus the degree of filter element clogging can be determined by the extent to which the top rod 52 extends. After replacing the filter element, the top rod 52 can be manually reset.

[0047] The contamination indicator for filters provided in this disclosure adopts a cartridge-type installation method, installing the contamination indicator in the filter valve body, resulting in a more compact overall structure. Contamination indication is achieved by the movement of piston 20 pushing push rod 52 to extend, which is convenient for observation. After replacing the filter element, push rod 52 can be manually reset directly. Furthermore, the push rod 52 and push rod 40 adopt a split structure, which reduces the requirements for machining and installation accuracy and can effectively reduce costs. The compression of the spring can be adjusted by controlling the depth of thread insertion, thereby adjusting the trigger pressure difference of the contamination indicator.

[0048] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0049] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0050] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A contamination indicator for a filter, characterized in that, include: The housing (10) includes a first chamber (11) and a second chamber (12), wherein the first chamber (11) and the second chamber (12) are connected through a connecting hole, the first chamber (11) includes a low-pressure chamber and a high-pressure chamber, the housing (10) includes a first opening and a second opening, wherein the high-pressure chamber is connected to the outside through the first opening, and the low-pressure chamber is connected to the outside through the second opening; A piston (20) is slidably disposed in the first chamber (11), and the circumferential surface of the piston (20) is in contact with the circumferential wall surface of the first chamber (11) so as to divide the first chamber (11) into the high-pressure chamber and the low-pressure chamber. An elastic element (30) is disposed in the low-pressure chamber. One end of the elastic element (30) abuts against the piston (20), and the other end of the elastic element (30) abuts against the wall of the housing (10). Push rod (40), one end of which is connected to the piston (20), and the other end of which passes through the connecting hole into the second chamber (12). An indicator assembly (50) is disposed within the second chamber (12), wherein at least a portion of the indicator assembly (50) is movable away from the first chamber (11) by the push rod (40); The indicating component (50) includes: Nut (51), the nut (51) is disposed in the second chamber (12) and can be fixedly connected to the housing (10). The nut (51) has a receiving cavity in the middle for the push rod (40) to slide through the nut (51). A push rod (52) is slidably disposed in the receiving cavity. One end of the push rod (52) can abut against the push rod (40) and can move away from the first chamber (11) in the receiving cavity under the push of the push rod (40). The cavity includes a first section and a second section, wherein the inner diameter of the first section is smaller than the inner diameter of the second section, thereby forming a stepped hole structure. One end of the top rod (52) has a locking platform, and the outer periphery of the locking platform contacts the inner wall of the second section. The piston (20) has a mounting hole, one end of the push rod (40) is fixedly connected to the mounting hole, and the push rod (40) is provided with a damping hole (41). The low-pressure chamber communicates with the second opening through the damping hole (41) and the mounting hole. The piston (20) also has a through hole arranged perpendicular to the axis of the housing (10), and the low-pressure chamber is connected to the second opening through the damping hole (41), the mounting hole and the through hole; The outer circumferential surface of the housing (10) is provided with an external thread (13), and the housing (10) is screwed to the valve body of the filter through the external thread (13).

2. The contamination indicator for a filter according to claim 1, characterized in that, The inner circumferential surface of the receiving cavity is provided with a first annular groove, and a first sealing ring (53) is provided in the first annular groove. The first sealing ring (53) abuts against the outer circumferential surface of the push rod (40). The end face of the nut (51) near the first chamber (11) is provided with a second annular groove, and a second sealing ring (54) is provided in the second annular groove. The second sealing ring (54) abuts against the inner wall surface of the housing (10).

3. The contamination indicator for a filter according to claim 1, characterized in that, The inner circumferential surface of the first segment is provided with a third annular groove, and a third sealing ring (55) is provided in the third annular groove. The third sealing ring (55) is in contact with the outer circumferential surface of the top rod (52).

4. The contamination indicator for a filter according to claim 1, characterized in that, The pollution indicator includes a valve seat (60) that communicates with the side of the housing (10) away from the second chamber (12). The inner cavity of the valve seat (60) and one side of the piston (20) together form the high-pressure chamber.

5. The contamination indicator for a filter according to claim 1, characterized in that, The piston (20) has a fourth annular groove on its outer circumferential surface, and a fourth sealing ring (21) is provided in the fourth annular groove. The fourth sealing ring (21) is in contact with the inner circumferential surface of the first chamber (11).

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