A filter for a reduction gearbox

Abstract

A filter for a reduction gearbox belongs to the field of filtering technology. The reduction gearbox includes a housing, the housing is filled with lubricating oil for lubricating and cooling gear pairs, a filter is installed on the housing, and the characteristics are: the filter includes a core located inside and a shell located outside the core, a one-way valve 1 is installed in the inner cavity of the core, a cavity is formed between the core and the shell, the two ends of the cavity are closed, the cavity is connected to the inner cavity of the core, a one-way valve 2 is installed on the end of the cavity close to the housing, and the one-way valve 1 and the one-way valve 2 pass the high-pressure gas in the housing to the outside of the housing. Advantages: When the temperature inside the reduction gearbox is high, the filter can realize ventilation inside and outside the reduction gearbox, and absorb moisture in the air entering the housing, thereby ensuring the service life of the lubricating oil and desiccant.

Description

Technical Field

[0001] The invention belongs to the technical field of filtering, and in particular relates to a filter for a reduction box. Background Art

[0002] The reduction box is a reduction transmission device between the prime mover and the working machine. It is one of the important transmission components. It stores lubricating oil for lubricating and cooling the gear pair. When the gear pair is running, heat will be generated, which will increase the temperature of the lubricating oil and air in the reduction box. Especially in the summer outdoors or in continuous operation, the temperature will become very high, and the gas inside the reduction box will expand. In order not to damage the static oil seal of the reduction box, the ventilation of the reduction box is particularly important. Therefore, a dust-proof pressure ventilation device is installed on the existing reduction box, which is mainly used to balance the atmospheric pressure inside and outside the reduction box. For example: the "ventilation device with one-way function for automobile crane winch planetary gear reducer" involved in the Chinese utility model patent authorization announcement number CN203146776U is composed of a standard hexagon socket screw plug and a one-way valve. The screw plug is made with a step-shaped vent hole that penetrates the inner cavity of the reducer housing. The one-way valve is a standard ball-type one-way valve, and the ball valve is installed in the large hole of the vent hole. Under normal conditions, the one-way valve isolates the reducer cavity from the outside world, blocks foreign matter from entering the reducer cavity, and ensures the cleanliness of the reducer cavity. When the reducer is working, the temperature and air pressure in the cavity rise, reaching the opening pressure of the one-way valve, the one-way valve automatically opens, and the vent exhausts to the outside world, reducing the pressure in the reducer cavity. At the same time, the opening and closing of the one-way valve is instantaneous, avoiding leakage and splashing of gear oil, and completely avoiding oil leakage. However, its shortcomings are: at present, this ventilation device only has the function of ventilation. According to the actual working conditions of the reducer, during high-speed operation, there will be water vapor in the hot air in the box, and condensation will occur during the gas cooling process. Water enters the lubricating oil, which will affect the life and quality of the oil over time.

[0003] In view of the above-mentioned prior art, it is necessary to reasonably improve the existing filter structure for the reduction box. For this reason, the applicant has made a useful design, and the technical solution to be introduced below is produced under this background. Summary of the invention

[0004] The task of the present invention is to provide a filter for a reduction box, which can not only realize effective ventilation inside and outside the reduction box when the temperature inside the reduction box is high, but also absorb water vapor in the hot air in the box and moisture in the air entering the box, thereby ensuring the service life of the lubricating oil and desiccant.

[0005] The task of the present invention is accomplished in this way. A filter for a reduction gear box, the reduction gear box includes a box body, the box body is filled with lubricating oil for lubricating and cooling gear pairs, a filter is installed on the box body, the filter includes a core located inside and a shell located outside the core, a one-way valve 1 is installed in the inner cavity of the core, a cavity is formed between the core and the shell, the two ends of the cavity are closed, the cavity is connected to the inner cavity of the core, and a one-way valve 2 is installed on the end of the cavity close to the box body, and the one-way valve 1 and the one-way valve 2 pass the high-pressure gas in the box body to the outside of the box body.

[0006] In a specific embodiment of the present invention, one end of the cavity close to the box body is closed by a bottom cover, and the other end away from the box body is closed by an upper cover, and the one-way valve 2 is installed on the bottom cover and located in the cavity.

[0007] In another specific embodiment of the present invention, a desiccant is installed in the cavity and on the side of the one-way valve 2 away from the box body, a baffle with a through hole is installed on the side of the desiccant away from the box body, and a spring is provided between the baffle and the upper cover.

[0008] In yet another specific embodiment of the present invention, the core is a through-going cylindrical component.

[0009] In another specific embodiment of the present invention, a splash shield is installed near the box body side of the one-way valve 1, and a through hole is opened on the splash shield. The through hole passes the high-pressure gas in the reduction box to the one-way valve 1 and opens the one-way valve 1.

[0010] In yet another specific embodiment of the present invention, a threaded section is processed on the outside of the core and on the end close to the housing, and the filter is mounted on the housing through the threaded section of the core.

[0011] In a further specific embodiment of the present invention, a boss is provided on the threaded section of the core near the outer side of the box body, the bottom cover abuts against the surface of the boss away from the box body, and the outer edge of the bottom cover is fixedly connected to the shell; the end surface of the boss close to the box body abuts against the box body, and the bottom cover is spaced apart from the box body.

[0012] In a further specific embodiment of the present invention, four one-way valves 2 are evenly installed in the circumferential direction of the bottom cover.

[0013] In yet another specific embodiment of the present invention, the end of the core away from the box body is processed with a step, and the baffle is pressed against the step.

[0014] In yet another specific embodiment of the present invention, the end surface of the core away from the box body is spaced apart from the upper cover.

[0015] The present invention has the following beneficial effects after adopting the above structure: first, the balance of air pressure inside and outside the reduction box is achieved through the one-way valve one and the one-way valve two, and the internal and external air pressures are effectively balanced; second, a desiccant is installed between the one-way valve one and the one-way valve two to effectively absorb water vapor in the hot air, and prevent the water vapor from condensing and dripping into the lubricating oil to cause rapid oxidation of the lubricating oil, thereby ensuring the service life of the lubricating oil; third, the structure can effectively prevent external moisture and impurities from entering the reduction box. Since the desiccant is sealed inside, it is less affected by adverse external environmental factors, so the service life of the desiccant can be guaranteed and the frequency of its replacement can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of a reduction gearbox equipped with a filter according to the present invention.

[0017] Figure 2 It is a schematic diagram of the structure of the filter described in the present invention.

[0018] In the figure: 1. box body; 2. filter, 20. core, 201. threaded section, 202. boss, 203. step, 21. shell, 22. one-way valve 1, 23. splash shield, 24. bottom cover, 25. upper cover, 26. one-way valve 2, 27. desiccant, 28. baffle, 29. spring, 30. cavity, 40. gap. DETAILED DESCRIPTION

[0019] The following is a detailed description in the form of embodiments in combination with the accompanying drawings, but the description of the embodiments is not a limitation on the technical solution of the present invention. Any equivalent changes made based on the concept of the present invention that are merely formal but not substantial should be regarded as within the scope of the technical solution of the present invention.

[0020] In the following description, all concepts related to up, down, left, right, front and back directions or orientations are based on Figure 2 The positions shown are for reference only and thus cannot be understood as a special limitation on the technical solution provided by the present invention.

[0021] See also Figure 1 , Figure 2The present invention relates to a filter for a reduction gearbox, wherein the reduction gearbox comprises a housing 1, wherein the housing 1 is filled with lubricating oil for lubricating and cooling a gear pair, and a filter 2 is installed on the housing 1. The filter 2 comprises a core 20 located inside and a shell 21 located outside the core 20, wherein the core 20 is a through cylindrical component, wherein a one-way valve 22 is installed in its inner cavity, and a splash shield 23 is installed on the side of the one-way valve 22 facing the inside of the housing 1, wherein the splash shield 23 can prevent the lubricating oil from directly spraying into the one-way valve 22 when the housing 1 is turned over, thereby playing a certain protective role. Holes are provided on both sides of the splash shield 23, wherein the holes can pass the high-pressure gas in the reduction gearbox to the one-way valve 22, thereby opening the one-way valve 22.

[0022] like Figure 2 As shown, the end of the outer part of the core 20 near the box body 1 is processed with a threaded section 201, and the position of the threaded section 201 near the outer side of the box body 1 is convexly provided with a boss 202, and the surface of the boss 202 away from the box body 1 is abutted and installed with a bottom cover 24, and the outer edge of the bottom cover 24 is fixedly connected to the shell 21. At this time, a cavity 30 is formed between the core 20 and the shell 21, and the two ends of the cavity 30 are closed. Specifically, one end of the cavity 30 close to the box body 1 is closed by the bottom cover 24, and the other end away from the box body 1 is closed by the upper cover 25. A through hole is processed on the circumference of the bottom cover 24, and a check valve 2 26 is installed on the through hole of the bottom cover 24. The check valve 1 22 and the check valve 2 26 pass the high-pressure gas in the box body 1 to the outside of the box body 1. In this embodiment, the cavity 30 is an annular cavity, the check valve 2 26 is located inside the cavity 30, and four check valves 2 26 are evenly installed on the bottom cover 24. The cavity 30 between the core 20 and the housing 21 and located on the side of the one-way valve 26 away from the housing 1, that is, Figure 2 A desiccant 27 is installed above the housing 1. The side of the desiccant 27 away from the housing 1 is Figure 2 A baffle 28 with a through hole is installed above the housing 21, and a spring 29 is provided between the baffle 28 and the upper cover 25. The function of the spring 29 is to press against the baffle 28 through a certain spring force in the housing 21, so that there is space for expansion and contraction when the desiccant 27 absorbs moisture and expands. A step 203 is processed on the end of the core 20 away from the box body 1, and the baffle 28 is pressed against the step 203. The cavity 30 is connected to the inner cavity of the core 20. Specifically, the end surface of the core 20 away from the box body 1 is separated from the upper cover 25, that is, there is a gap 40, that is, the gas in the inner cavity of the core 20 can flow into the cavity 30 through the gap 40.

[0023] like Figure 2As shown, the filter 2 is installed on the housing 1 through the threaded section 201 of the core 20. At the same time, the end face of the boss 202 on the core 20 close to the housing 1 abuts against the housing 1, and the bottom cover 24 is spaced apart from the housing 1, so that when the one-way valve 26 is opened, the inside and outside of the filter 2 can be ventilated smoothly.

[0024] Please continue reading Figure 1 and Figure 2 The working process of the filter for the reduction box of the present invention is as follows: when the reduction box is working, when its internal temperature rises, the air pressure rises, and the high-pressure gas flows to the one-way valve 22 through the through hole of the splash shield 23. When the gas pressure rises to the opening pressure of the one-way valve 22, the one-way valve 22 is opened, and the high-pressure gas flows into the core 20 through the one-way valve 22, and then flows into the cavity 30 between the core 20 and the shell 21 through the gap 40. After flowing through the spring 29 and the desiccant 27, the one-way valve 26 is opened to connect the inside and outside of the reduction box and balance the air pressure. During the gas circulation process, the desiccant 27 filters the gas flowing through to prevent the water vapor in the gas from condensing into the lubricating oil, causing the oxidation and deterioration of the lubricating oil. When the temperature of the reduction box decreases, the gas pressure decreases, and the one-way valve 22 and the one-way valve 26 are both closed, cutting off the connection between the gas inside and outside the reduction box.

Claims

1. A filter for a reduction gearbox, the reduction gearbox comprising a housing (1), the housing (1) being filled with lubricating oil for lubricating and cooling a gear pair, a filter (2) being mounted on the housing (1), characterized in that: The filter (2) comprises a core (20) located inside and a shell (21) located outside the core (20); a one-way valve (22) is installed in the inner cavity of the core (20); a cavity (30) is formed between the core (20) and the shell (21); both ends of the cavity (30) are closed; the cavity (30) is connected to the inner cavity of the core (20); a one-way valve (26) is installed at the end of the cavity (30) close to the box body (1); the one-way valve (22) and the one-way valve (26) pass the high-pressure gas in the box body (1) to the box body (1); The chamber (30) is provided with a bottom cover (24) and a bottom cover (25) which is located outside the chamber (1); one end of the chamber (30) close to the chamber (1) is closed by a bottom cover (24), and the other end away from the chamber (1) is closed by an upper cover (25); the second one-way valve (26) is mounted on the bottom cover (24) and is located in the chamber (30); a desiccant (27) is mounted in the chamber (30) and on the side of the second one-way valve (26) away from the chamber (1); a baffle (28) with a through hole is mounted on the side of the desiccant (27) away from the chamber (1); a spring (29) is provided between the baffle (28) and the upper cover (25).

2. A filter for a reduction gearbox according to claim 1, characterized in that The core (20) is a through-going cylindrical component.

3. A filter for a reduction gearbox according to claim 1, characterized in that A splash shield (23) is installed on the side of the one-way valve (22) close to the box body (1), and a through hole is opened on the splash shield (23). The through hole allows the high-pressure gas in the reduction box to pass to the one-way valve (22) and open the one-way valve (22).

4. A filter for a reduction gearbox according to claim 1, characterized in that A threaded section (201) is processed on the outside of the core (20) and at the end close to the housing (1), and the filter (2) is installed on the housing (1) through the threaded section (201) of the core (20).

5. A filter for a reduction gearbox according to claim 4, characterized in that A boss (202) is provided at a position of the threaded section (201) of the core (20) close to the outer side of the box body (1); the bottom cover (24) abuts against a surface of the boss (202) away from the box body (1); the outer edge of the bottom cover (24) is fixedly connected to the shell (21); the end surface of the boss (202) close to the box body (1) abuts against the box body (1), and the bottom cover (24) is spaced apart from the box body (1).

6. A filter for a reduction gearbox according to claim 1, characterized in that Four one-way valves (26) are evenly installed in the circumferential direction of the bottom cover (24).

7. The filter for a reduction gearbox according to claim 1, characterized in that The end of the core (20) away from the box body (1) is processed with a step (203), and the baffle (28) is pressed against the step (203).

8. The filter for a reduction gearbox according to claim 1, characterized in that The end surface of the core (20) away from the box body (1) is spaced apart from the upper cover (25).

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