An oil suction filter

Abstract

The application discloses an oil suction filter, in particular an oil suction filter for an air compressor. The oil suction filter comprises a conversion joint, a filter screen and a guide cylinder. The conversion joint has a through hole penetrating from top to bottom. The guide cylinder and one end of the filter screen are respectively in sealed connection with the conversion joint. The filter screen is sleeved in the guide cylinder, and an annular space is formed between the filter screen and the guide cylinder. The guide cylinder with the top being wide and the bottom being narrow can provide stable oil pressure, ensure effective oil suction under the minimum liquid surface of an oil tank, reduce air suction and improve the stability of oil pressure in a lubricating system.

Description

TECHNICAL FIELD

[0001] The present application relates to a filter, in particular to an oil suction filter applied to an air compressor. BACKGROUND

[0002] The existing oil suction filters applied in oil tanks in the market are divided into built-in type and external type, wherein the built-in type oil suction filter usually adopts a stainless steel wire woven mesh as a filter material, and the filter mesh is integrally wrapped around the oil inlet pipe of the filter, so that the hydraulic oil can effectively capture impurities. However, this design has high requirements for the installation position and the liquid level in the oil tank. When the liquid level in the oil tank is low, air is easily sucked in, which leads to low oil pressure and poor oil pressure stability, thereby affecting the lubrication of the whole system.

[0003] The utility model patent document CN207048890U discloses a fuel filter center pipe structure with an oil suction pipe, which comprises a fuel filter center pipe body, an oil suction pipe is arranged axially in the center pipe body, the lower part of the oil suction pipe is a straight cylinder, and the upper part is a conical pipe. A filter paper is arranged outside the center pipe, and the center pipe can support the filter paper. After diesel fuel is filtered by the filter paper, it directly passes through the center pipe body and enters the oil suction pipe. However, this patent has high requirements for the installation position and the liquid level in the oil tank. When the liquid level in the oil tank is low, the filter paper cannot be fully utilized, and air is easily sucked in, which leads to low oil pressure and poor oil pressure stability. SUMMARY

[0004] In view of the problem that the oil suction filter easily sucks in gas and causes unstable oil pressure due to the inclination of the liquid level of lubricating oil caused by uphill or uneven road surface during the operation of the vehicle, the present application provides a new oil suction filter.

[0005] In order to solve the above technical problems, the present application adopts the following technical solutions:

[0006] An oil suction filter comprises a conversion joint, a filter mesh and a guide cylinder. The conversion joint has a through hole penetrating from top to bottom. The guide cylinder and one end of the filter mesh are respectively in sealed connection with the conversion joint. The filter mesh is sleeved in the guide cylinder, and an annular space is formed between the filter mesh and the guide cylinder.

[0007] Further, the conversion joint comprises a protruding connecting part, and the through hole penetrates the connecting part.

[0008] Further, the outer periphery of the connecting part has a thread.

[0009] Furthermore, the guide cylinder is a straight cylinder with a different diameter. Furthermore, the conversion connector includes a base, and the bottom surface of the base is provided with a fixing groove surrounding the through hole. One end of the guide cylinder and the filter screen are sealed and connected to the conversion connector through the fixing groove.

[0010] Furthermore, the upper part of the guide tube is fitted with the outer inner wall of the fixing groove to form a sealed connection, and the filter screen is sleeved on the outer inner wall of the fixing groove through the upper skeleton and forms a sealed connection with the top wall of the fixing groove.

[0011] Furthermore, the top surface of the base is provided with a sealing groove surrounding the through hole, and a sealing ring adapted to it is provided in the sealing groove.

[0012] Furthermore, the filter screen includes a mesh fabric and a frame. The frame includes an upper frame and a lower frame. The upper frame has a ring structure and is located at the top of the filter screen, while the lower frame is located at the bottom of the filter screen. The mesh fabric and the frame are fixedly connected to form an integral filter screen.

[0013] Furthermore, one or more support rods are fixedly connected between the upper frame and the lower frame.

[0014] Furthermore, the guide tube is a variable diameter tube that is wider at the top and narrower at the bottom.

[0015] Furthermore, the adapter also includes a base with a hexagonal outer periphery.

[0016] The beneficial effects of this invention are: This invention enables the oil filter to effectively absorb oil while reducing air intake during vehicle operation, thereby providing stable oil pressure. Furthermore, adapters inevitably become slippery and difficult to disassemble when in operation due to lubricating oil. The hexagonal base of the adapter in this invention not only facilitates clamping and installation but also allows for easy disassembly and replacement later. Attached Figure Description

[0017] Figure 1 The diagram shown is a schematic representation of the structural principle of one embodiment of the present invention.

[0018] Figure 2 for Figure 1 Cross-sectional view.

[0019] Figure 3 The diagram shown is a schematic of the adapter.

[0020] Figure 4 The diagram shown is a schematic of the guide tube.

[0021] Figure 5 The diagram shown is a schematic of the filter screen.

[0022] Figure 6 The working principle of the present application is shown. DETAILED DESCRIPTION

[0023] The present application provides an oil filter, which is described in detail below in combination with the drawings.

[0024] In combination Figure 1 and Figure 2 As shown in the drawings, the oil filter of the present application comprises a conversion joint 1, a filter screen 3 and a guide cylinder 2. The conversion joint 1 comprises a protruding connecting portion 101 and a base 105. In a preferred embodiment, the base 105 of the conversion joint 1 is hexagonal, but it is understood that other shapes can be adopted to achieve the same function. In a preferred embodiment, the connecting portion 101 is cylindrical. The connecting portion 101 has a through hole passing through the top and bottom thereof at the middle position, and optionally, the outer side of the connecting portion 101 is threaded to facilitate installation and removal.

[0025] As Figure 3 shown in the drawings, in a preferred embodiment, the top surface of the base 105 of the conversion joint 1 has a concave sealing groove 102 surrounding the outer periphery of the connecting portion 101, and a sealing ring 104, such as an O-ring, is arranged in the sealing groove 102 to enable the conversion joint 1 to be sealingly connected to a counterpart. The bottom surface of the base 105 of the conversion joint 1 has a fixing groove 103 surrounding the through hole to guide the installation of the guide cylinder 2, and the inner wall of the fixing groove 103 comprises, from the outside to the inside, an outer side inner wall, a top wall and an inner side inner wall. The sealing groove 102 and the fixing groove 103 are optionally coaxial with the through hole.

[0026] As Figure 4 shown in the drawings, the guide cylinder 2 is a straight cylinder, and the upper part of the outer side wall of the guide cylinder 2 is sealingly connected to the outer side inner wall of the fixing groove 103. The top end of the guide cylinder 2 is sealingly connected to the top wall of the fixing groove 103, for example, by being fixed to the fixing groove 103 by adhesive bonding. In a preferred embodiment, the guide cylinder 2 is a step straight cylinder with a wide upper part and a narrow lower part.

[0027] As Figure 5 shown in the drawings, the filter screen 3 comprises a mesh cloth and a framework, and the framework comprises an upper framework 301 and a lower framework 302 in a ring structure. The mesh cloth is fixedly connected to the framework to form an integrated filter screen 3, and the bottom and side surfaces of the filter screen 3 are covered by the mesh cloth. Optionally, a plurality of support rods 303 are fixedly connected between the upper framework 301 and the lower framework 302, which can enhance the overall strength of the filter screen 3. In a preferred embodiment, four support rods 303 are fixedly connected between the upper framework 301 and the lower framework 302, and the support rods 303 are evenly distributed. The inner diameter of the opening of the upper framework 301 is greater than or equal to the inner diameter of the fixing groove 103, so that the upper part of the filter screen 3 is sleeved on the outer periphery of the inner side inner wall of the fixing groove 103 and connected to the top wall of the fixing groove 103 through the upper framework 301.Figure 2 As shown, the filter screen 3 is fitted inside the guide cylinder 2, forming an annular space between the filter screen 3 and the guide cylinder 2. Optionally, when the guide cylinder 2 is a cylinder with a different diameter, the lower frame 302 of the filter screen 3 can be located above the diameter change point of the guide cylinder 2.

[0028] like Figure 6 As shown, during use, the connecting part 101 of the adapter 1 is threadedly connected to the matching part. In the preferred embodiment, the hexagonal base 105 of the adapter 1 facilitates clamping, installation, and disassembly / replacement, while the sealing ring 104 in the sealing groove 102 forms an end-face seal with the matching part. As the oil pump operates, a negative pressure is generated above the oil suction filter of the present invention, thereby filling the guide cylinder 2 with lubricating oil. The lubricating oil is drawn in from the bottom and sides through the mesh of the filter screen 3, allowing the lubricating oil to be fully filtered. According to the oil suction filter of the present invention, since the annular space between the guide cylinder 2 and the filter screen 3 is filled with lubricating oil, the situation of air being drawn in from the connecting part 101 is greatly reduced. Even when the vehicle is going up or down a slope or the road surface is uneven, causing the oil surface to tilt, the filter screen will not be exposed to air. In the preferred embodiment of the guide cylinder with different diameters, since the lower diameter of the guide cylinder is smaller, it is easier to keep the guide cylinder 2 filled with lubricating oil compared to a guide cylinder with the same diameter at both the top and bottom. This can further reduce the situation of air being drawn in and enhance the oil pressure stability of the lubrication system. Finally, the lubricating oil flows out through the through hole of the connecting part 101.

[0029] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. An oil suction filter characterized by comprising: The utility model provides a filter device, including conversion joint (1), filter screen (3) and guide cylinder (2), conversion joint (1) has the through -hole of up and down, and guide cylinder (2) and one end of filter screen (3) are sealedly connected with conversion joint (1) respectively, filter screen (3) is set in guide cylinder (2), and annular space is formed between filter screen (3) and guide cylinder (2). The conversion joint (1) includes a base (105), and a fixed groove (103) is arranged on the bottom surface of the base (105) and surrounds the through hole; one end of the guide cylinder (2) and the filter screen (3) are sealedly connected with the conversion joint (1) through the fixed groove (103). The conversion joint (1) includes a base (105), and a sealing groove (102) is arranged on the top surface of the base (105) and surrounds the through hole; a sealing ring (104) is arranged in the sealing groove (102) and is matched with the sealing groove (102). The guide cylinder (2) is a straight cylinder with different diameters, which is wide at the top and narrow at the bottom. The filter screen (3) includes a mesh cloth and a framework, the framework includes an upper framework (301) and a lower framework (302), the upper framework (301) is in an annular structure, the upper framework (301) is arranged on the top of the filter screen (3), the lower framework (302) is arranged on the bottom of the filter screen (3), and the mesh cloth is fixedly connected with the framework to form an integrated filter screen (3). The lower framework (302) of the filter screen (3) is located above the position where the diameter of the guide cylinder (2) changes.

2. The oil strainer according to claim 1, characterized by The conversion joint (1) includes a protruding connecting part (101), and the through hole penetrates the connecting part (101).

3. The oil filter according to claim 2, wherein The connecting part (101) is externally threaded.

4. The oil filter according to claim 1, wherein The upper part of the guide cylinder (2) is in sealing connection with the outer side inner wall of the fixed groove (103), the filter screen (3) is arranged on the outer side inner wall of the fixed groove (103) through the upper framework (301) and is in sealing connection with the top wall of the fixed groove (103).

5. The oil filter according to claim 1, wherein One or more supporting rods (303) are fixedly connected between the upper framework (301) and the lower framework (302).

6. The oil filter according to claim 1, wherein The conversion joint (1) further includes a base (105) with a hexagonal outer periphery.

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