Oil return filter capable of entering from inside and going out

Abstract

The utility model provides an inside-in and outside-out oil return filter which comprises a vertical oil return filter element, an oil return inlet communicated with an inner cavity of the oil return filter element is arranged on a lower end cover of the oil return filter element, a check valve is fixedly installed at the oil return inlet, and the check valve comprises a diaphragm type valve covering the oil return inlet. A frame body used for supporting the valve is arranged below the valve, the frame body is fixedly connected to the lower end cover, and the middle of the valve is fixedly connected to the frame body; the diaphragm type valve covers the oil return inlet under the supporting action of the frame body, so that a check valve is formed, the check valve is closed through the gravity of oil liquid, pollutants are effectively prevented from entering the oil tank, and the oil return device is simple in structure and stable in function.

Description

Technical Field

[0001] The utility model relates to an oil return filter, in particular to an inner-inlet and outer-outlet oil return filter. Background Art

[0002] The return oil filter of the hydraulic system can filter out impurities, particulate matter and metal particles in the return oil, and protect the cleanliness and stability of the hydraulic system. As impurities clog, the resistance of the return oil filter increases. When the set pressure difference is reached, the filter element needs to be maintained. The existing return oil filter generally adopts an outside-in and inside-out structure, such as the bypass valve structure of a return oil filter in the publication number CN220435176U. The return oil filter is vertically arranged in the return oil chamber, and the oil in the return oil chamber enters the return oil filter after passing through the filter element at the side wall of the return oil filter. When the return oil filter needs to be replaced, the return oil chamber is in an empty state, and the return oil filter can be directly pulled upward from the return oil chamber. Since there is no oil flowing in the return oil chamber, the impurity particles on the outer wall of the return oil filter will not fall off actively and enter the oil tank through the oil outlet at the bottom of the return oil chamber. At present, it is necessary to design an inner-inlet and outer-outlet return oil filter, the outer wall of which is directly connected to the inside of the oil tank. When the return oil filter is pulled upward from the oil tank, if the impurity particles on the inner wall of the return oil filter fall off, they will fall directly into the oil tank, which will affect the hydraulic system, such as an inner-inlet and outer-outlet filtering device disclosed in publication number CN113565807B; before replacing the return oil filter, since the oil containing impurities in the return oil filter cannot be discharged, and the oil inlet of the return oil filter is set at its lower part, when the return oil filter is pulled upward, the oil in the return oil filter will flow into the oil tank through the oil inlet, affecting the cleanliness of the oil in the oil tank. Utility Model Content

[0003] In view of the problems in the prior art, the utility model provides an inside-in and outside-out oil return filter, the purpose of which is to seal the oil containing impurities in the oil return filter and the pollutants on the inner wall thereof in the oil return filter, thereby preventing the pollutants from entering the oil tank.

[0004] An in-out return oil filter comprises a vertical return oil filter element, a return oil inlet communicating with an inner cavity of the return oil filter element is arranged on the lower end cover of the return oil filter element, a check valve is fixedly installed at the return oil inlet, the check valve comprises a diaphragm valve covered on the return oil inlet, a frame for supporting the valve is arranged below the valve, the frame is fixedly connected to the lower end cover, and the middle part of the valve is fixedly connected to the frame.

[0005] Furthermore, the valve is made of rubber, the shape of the valve matches the shape of the oil return inlet, and the valve covers the oil return inlet from top to bottom under the support of the frame.

[0006] Further, the vertical cross section of the valve is V-shaped.

[0007] Further: a fixing platform is integrally provided in the middle of the frame between the frame and the valve, the table top of the fixing platform is fitted with the bottom surface of the valve, a fixing column is integrally provided in the middle of the fixing platform, the fixing column passes through the valve, a clamping cap is fixedly sleeved on the fixing column, and the lower end surface of the clamping cap abuts against the valve.

[0008] Furthermore, the clamping cap and the fixing column are fixed by ultrasonic welding, wherein the top of the fixing column is melted by the ultrasonic wave to form a clamping portion, and the clamping portion of the fixing column is clamped and fixed in the clamping cap.

[0009] Further, the middle part of the lower end cover is folded and extended into the inner cavity of the return oil filter element to form an isolation cylinder, an oil return channel is formed in the isolation cylinder, the upper end port of the isolation cylinder is the return oil inlet, the outer edge of the valve covers the upper end face of the isolation cylinder, and the frame is integrally connected to the inner wall of the upper part of the isolation cylinder; a gap is left between the outer wall of the isolation cylinder and the inner wall of the return oil filter element, and a dirt accumulation groove is formed in the gap.

[0010] Further, the inner wall of the middle part of the isolation tube is bent inwards to form a limit platform.

[0011] Furthermore, an annular groove body for accommodating a sealing ring is integrally provided on the bottom surface of the lower end cover at a position corresponding to the lower end port of the isolation cylinder.

[0012] Further, a cylinder is fixedly arranged between the lower end cover and the upper end cover of the oil return filter element, a gap is left between the cylinder and the outer wall of the oil return filter element, and a defoaming cavity is formed at the gap, and through holes for oil liquid to pass through are distributed on the cylinder.

[0013] Furthermore, the cylinder is a perforated plate or a metal filter.

[0014] The beneficial effects of the utility model are as follows: the diaphragm valve is covered on the oil return inlet under the support of the frame, thereby forming a check valve, and the check valve is closed by the gravity of the oil itself, effectively preventing pollutants from entering the oil tank. The utility model has a simple structure and stable functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 for Figure 1 Schematic diagram of the structure of the middle A area;

[0017] Figure 3 It is a structural schematic diagram of the lower end cover and the check valve in the utility model. DETAILED DESCRIPTION

[0018] The utility model is described in detail below in conjunction with the accompanying drawings. The embodiments of the utility model 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 with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the utility model, and cannot be interpreted as limiting the utility model. The directional terms such as left, middle, right, top, and bottom in the embodiments of the utility model are only relative concepts or are based on the normal use state of the product, and should not be considered as restrictive.

[0019] An inlet-outlet return oil filter, such as Figure 1 and Figure 2 As shown, it includes a vertical and cylindrical return oil filter element 3, a return oil inlet 43 connected to its inner cavity is arranged on the lower end cover of the return oil filter element 3, and a check valve is fixedly installed at the return oil inlet 43, the check valve includes a diaphragm valve 62 covered on the return oil inlet, a frame 63 for supporting the valve 62 is arranged below the valve 62, the frame 63 is fixedly connected to the lower end cover 4, and the middle part of the valve 62 is fixedly connected to the frame 63; when the return oil flows through the return oil inlet 43, the return oil pushes the valve 62 upward away from the return oil inlet 43 under the action of its hydraulic pressure, thereby opening the return oil inlet 43; when the return oil stops, the valve 62 is reset and covers the return oil inlet 43, thereby sealing the return oil inlet 43; when the utility model is replaced, the valve 62 plays a sealing role through the gravity of the oil itself, and the check valve is closed.

[0020] The valve 62 is made of rubber, and its shape matches the shape of the oil return inlet 43. The valve 62 covers the oil return inlet 43 from top to bottom under the support of the frame 63. In order to improve the stability of the valve function, the valve 62 is combined with the Figure 2As shown, the vertical cross section of the valve 62 is V-shaped, that is, the valve 62 is preferably a funnel-shaped structure with a large top and a small bottom. In order to facilitate the stable fixing and connection of the valve to the frame, a fixing platform 631 is integrally provided in the middle of the frame 63 between the frame 63 and the valve 62, and the table surface of the fixing platform 631 is in contact with the bottom surface of the valve 62. A fixing column 632 is integrally provided in the middle of the fixing platform 631, and the fixing column 632 passes through the valve 62. A clamping cap 61 is fixedly sleeved on the fixing column 632, and the lower end surface of the clamping cap 61 abuts against the valve 62, so that the valve 62 is clamped between the clamping cap 61 and the fixing platform 631, so as to avoid leakage of oil at the fixing point of the valve 62 and the frame 63, and improve the fixing effect of the frame 63 on the valve 62. To facilitate the connection between the clamping cap 61 and the fixing column 632, the clamping cap 61 and the fixing column 632 are fixed by ultrasonic welding. The ultrasonic welding process is used to melt the top of the fixing column 632 and form a snap-fitting portion, so that the snap-fitting portion of the fixing column 632 is snap-fitted and fixed in the clamping cap 61, effectively preventing it from falling off. It is safer and more reliable than traditional threaded fixing.

[0021] In order to prevent the impurity particles deposited in the inner cavity of the return oil filter from accumulating at the return oil inlet, the middle part of the lower end cover 4 is folded and extended into the inner cavity of the return oil filter 3 to form an isolation cylinder 41, and an oil return channel is formed in the isolation cylinder 41. The upper end port of the isolation cylinder 41 is the return oil inlet 43. The outer edge of the valve 62 covers the upper end face of the isolation cylinder 41, and the frame 63 is integrally connected to the inner wall of the upper part of the isolation cylinder 41; there is a gap between the outer wall of the isolation cylinder 41 and the inner wall of the return oil filter 3, and a dirt accumulation groove is formed at the gap. In order to facilitate the assembly and positioning of the utility model in the oil tank, the inner wall of the middle part of the isolation cylinder 41 is bent inward to form a limiting platform 44, so as to limit the joint inserted into the isolation cylinder 41. In order to facilitate the sealing of the joint between the lower end cover 4 and the oil tank, an annular groove body 42 for accommodating the sealing ring 5 is integrally provided on the bottom surface of the lower end cover 4 at a position corresponding to the lower end port of the isolation cylinder 41, and the sealing ring 5 is accommodated in the annular groove body 42.

[0022] In addition, a cylinder 2 is fixedly arranged between the lower end cover 4 and the upper end cover 1 of the return oil filter element 3. The cylinder 2 is a punching plate or a metal filter mesh, and the lower end cover 4 is made of reinforced nylon. A gap is left between the cylinder 2 and the outer wall of the return oil filter element 3, and a defoaming cavity is formed at the gap. Through holes for oil to pass through are distributed on the cylinder 2. When the oil enters the defoaming cavity through the return oil filter element 3, the flow rate of the oil is reduced, thereby reducing the impact force of the oil, reducing the generation of bubbles, and causing the bubbles to gradually dissipate.

[0023] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. An inlet-outlet return oil filter, comprising a vertical return oil filter element, a lower end cover of the return oil filter element is provided with an oil return inlet connected to the inner cavity thereof, characterized in that: A check valve is fixedly installed at the return oil inlet. The check valve includes a diaphragm valve covered on the return oil inlet. A frame for supporting the valve is arranged below the valve. The frame is fixedly connected to the lower end cover, and the middle part of the valve is fixedly connected to the frame.

2. The inner-in and outer-out oil return filter according to claim 1, characterized in that: The valve is made of rubber, and its shape matches the shape of the oil return inlet and covers the oil return inlet from top to bottom under the support of the frame.

3. The inner-in and outer-out oil return filter according to claim 1, characterized in that: The vertical cross-section of the valve is V-shaped.

4. The inner-inlet and outer-outlet return oil filter according to claim 1 or 3, characterized in that: A fixing platform is integrally provided in the middle of the frame, between the frame and the valve, and the surface of the fixing platform fits with the bottom surface of the valve. A fixing column is integrally provided in the middle of the fixing platform, and the fixing column passes through the valve. A clamping cap is fixedly sleeved on the fixing column, and the lower end surface of the clamping cap abuts against the valve.

5. The inner-in and outer-out oil return filter according to claim 4, characterized in that: The clamping cap and the fixing column are fixed by ultrasonic welding, wherein the top of the fixing column is melted by ultrasonic wave to form a clamping part, and the clamping part of the fixing column is clamped and fixed in the clamping cap.

6. The inner-in and outer-out oil return filter according to claim 1, characterized in that: The middle part of the lower end cover is folded and extended into the inner cavity of the return oil filter element to form an isolation cylinder, an oil return channel is formed in the isolation cylinder, the upper end port of the isolation cylinder is the return oil inlet, the outer edge of the valve covers the upper end face of the isolation cylinder, and the frame is integrally connected to the inner wall of the upper part of the isolation cylinder; a gap is left between the outer wall of the isolation cylinder and the inner wall of the return oil filter element, and a dirt accumulation groove is formed at the gap.

7. The inner-in and outer-out oil return filter according to claim 6, characterized in that: The inner wall of the middle part of the isolation cylinder is bent inwards to form a limit platform.

8. The inner-in and outer-out oil return filter according to claim 6, characterized in that: An annular groove body for accommodating a sealing ring is integrally arranged on the bottom surface of the lower end cover at a position corresponding to the lower end port of the isolation cylinder.

9. The inner-in and outer-out oil return filter according to claim 1, characterized in that: A cylinder is fixedly arranged between the lower end cover and the upper end cover of the oil return filter element. A gap is left between the cylinder and the outer wall of the oil return filter element, and a defoaming cavity is formed at the gap. Through holes for oil to pass through are distributed on the cylinder.

10. The inner-in and outer-out oil return filter according to claim 9, characterized in that: The cylinder is a perforated plate or a metal filter.

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