Suction filter

Abstract

The utility model discloses a suction filter which comprises an oil suction pipe used for conveying engine oil from an oil pan to an engine oil pump, a partition extending in the flowing direction of the engine oil in the oil suction pipe is arranged in the oil suction pipe, and a pipe cavity of the oil suction pipe comprises a first sub-cavity and a second sub-cavity which are separated by the partition. A hydraulic control valve is arranged in one of the first sub-cavity and the second sub-cavity, and the opening degree of the hydraulic control valve can be changed along with the oil suction negative pressure of the oil pump side of the oil suction pipe. The suction filter can solve the problem of noise at the oil pan when the oil pump works at a low rotating speed.

Description

Technical Field

[0001] The utility model relates to the technical field of automobiles, in particular to a filter. Background Art

[0002] The filter is a device that is installed in front of the oil pump, collects the oil from the oil pan, performs preliminary filtration of large impurities, and then delivers it to the oil pump. The power of the filter to deliver the oil comes from the negative suction pressure generated by the oil pump. The disadvantage of the current filter is that when the oil pump works at a low speed, such as the idle condition of the car, due to the low flow rate of the oil pump and the small negative suction pressure, a large pressure pulsation will be generated in the oil suction pipe of the filter, and the pressure pulsation will excite the oil pan to cause noise. Therefore, how to improve the filter to avoid excessive pressure pulsation when the oil pump works at a low speed has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a filter with relatively low pressure pulsation to solve the noise problem at the oil pan when the oil pump works at a low speed.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A strainer comprises an oil suction pipe for conveying oil from an oil pan to an oil pump, wherein a baffle extending along the oil flow direction in the oil suction pipe is arranged inside the oil suction pipe, and a tube cavity of the oil suction pipe comprises a first sub-cavity and a second sub-cavity separated by the baffle, and a hydraulic control valve is arranged inside one of the first sub-cavity and the second sub-cavity, and the opening degree of the hydraulic control valve can change with the magnitude of the oil suction negative pressure on the oil pump side of the oil suction pipe.

[0006] Optionally, in the above-mentioned filter, the hydraulic control valve is arranged at a position of the oil suction pipe close to the oil pump.

[0007] Optionally, in the above-mentioned strainer, the hydraulic control valve includes a conical sealing surface, a sealing ball matched with the sealing surface, and a compression spring abutting against the sealing ball.

[0008] Optionally, in the above-mentioned strainer, the hydraulic control valve includes a circular sealing surface, a circular movable plate, and a torsion spring connected to the edge of the movable plate.

[0009] Optionally, the above-mentioned filter includes a trumpet-shaped oil suction cover connected to the end of the oil suction pipe away from the oil pump.

[0010] Optionally, in the above filter, the baffle extends over the entire length of the oil suction pipe, or the baffle extends over a partial length of the oil suction pipe.

[0011] Optionally, in the above-mentioned oil strainer, the oil suction pipe and the partition are of an integral structure.

[0012] Optionally, in the above-mentioned oil strainer, both the first sub-chamber and the second sub-chamber are circular cross-section chambers.

[0013] Optionally, in the above-mentioned oil strainer, the diameter of one of the first sub-chamber and the second sub-chamber where the hydraulic control valve is arranged is smaller than that of the other.

[0014] Optionally, in the above-mentioned oil strainer, the ratio of the diameter of one of the first sub-chamber and the second sub-chamber where the hydraulic control valve is arranged to the diameter of the other is between one-half and two-thirds.

[0015] The oil strainer provided by the present utility model has the following beneficial effects:

[0016] Since a partition extending along the flow direction of the engine oil in the oil suction pipe is arranged inside the oil suction pipe, the pipe cavity of the oil suction pipe includes a first sub-chamber and a second sub-chamber separated by the partition, and a hydraulic control valve with an opening degree that can change randomly according to the magnitude of the oil suction negative pressure on the oil pump side is arranged inside one of the first sub-chamber and the second sub-chamber. Therefore, when the oil pump operates at a low speed and the oil suction negative pressure is not sufficient to open the hydraulic control valve, only one of the first sub-chamber and the second sub-chamber conveys the engine oil, so that the oil suction pipe conveys the engine oil with a relatively small flow cross-section. In this way, the oil suction flow rate under low-speed conditions is increased, the pressure pulsation at the oil suction port of the low-speed oil pump is effectively improved, and the noise problem at the oil sump when the oil pump operates at a low speed is avoided. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0018] Figure 1 is a layout schematic diagram of the oil strainer provided by the embodiment of the present utility model;

[0019] Figure 2 is a structural schematic diagram of the hydraulic control valve of the oil strainer provided by the embodiment of the present utility model;

[0020] Figure 3 is a schematic diagram of another structural form of the oil strainer provided by the embodiment of the present utility model.

[0021] The labels in the figure are:

[0022] 100, oil pump; 210, oil suction pipe; 211, first sub-chamber; 212, second sub-chamber; 213, baffle; 220, hydraulic control valve; 221, sealing ball; 222, sealing surface; 223, compression spring; 230, oil suction hood. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figures 1 to 3 The embodiment of the utility model provides a filter, including an oil suction pipe 210 for conveying oil from an oil pan (not shown in the figure) to an oil pump 100, the interior of the oil suction pipe 210 is provided with a baffle 213 extending along the flow direction of the oil in the oil suction pipe 210, the lumen of the oil suction pipe 210 includes a first sub-chamber 211 and a second sub-chamber 212 separated by the baffle 213, and a hydraulic control valve 220 is provided inside one of the first sub-chamber 211 and the second sub-chamber 212, and the opening of the hydraulic control valve 220 can change with the magnitude of the negative pressure of the oil suction on the oil pump side of the oil suction pipe 210. It is easy to understand that the baffle 213 extends along the flow direction of the oil and will not affect the normal flow of the oil, and is only used to separate the first sub-chamber 211 and the second sub-chamber 212. Figure 1 In the exemplary embodiment, the hydraulic control valve 220 is arranged in the second sub-chamber 212. When the oil pump 100 is not working, that is, when there is no negative suction pressure, the hydraulic control valve 220 is in a closed state, and the second sub-chamber 212 is closed by the hydraulic control valve 220. When the oil pump 100 is working at a low speed, the negative suction pressure is small and insufficient to open the hydraulic control valve 220. At this time, only the first sub-chamber 211 conveys the oil. As the speed of the oil pump 100 increases, the negative suction pressure increases. When the negative suction pressure is greater than the preset value, the hydraulic control valve 220 opens, and the second sub-chamber 212 and the first sub-chamber 211 convey the oil together. It can be seen that when the oil pump 100 is working at a low speed, the oil suction pipe 210 conveys the oil with a relatively small flow cross section. In this way, the suction flow rate of the oil in the low-speed working condition is improved, the pressure pulsation of the oil suction port of the low-speed oil pump 100 is effectively improved, and the noise problem at the oil pan when the oil pump 100 is working at a low speed is avoided. When the oil pump 100 operates at a high speed, the oil suction pipe 210 conveys the oil with a relatively large flow cross section, thereby avoiding the cavitation problem caused by the large negative pressure of the oil suction.

[0025] exist Figure 1In the exemplary embodiment shown, the hydraulic control valve 220 is disposed at a position on the oil suction pipe 210 close to the oil pump 100, so that the function of the hydraulic control valve 220 in improving the pressure pulsation can be better exerted. Of course, in other embodiments, the hydraulic control valve 220 can also be disposed at other positions on the oil suction pipe 210, for example, at the middle position of the oil suction pipe 210, or at a position on the oil suction pipe 210 close to the oil sump.

[0026] There are various structural forms of the hydraulic control valve 220 to choose from, such as Figure 2 As shown, in some embodiments, the hydraulic control valve 220 may include a conical sealing surface 222, a sealing ball 221 cooperating with the sealing surface 222, and a compression spring 223 abutted against the sealing ball 221. It is easy to understand that when the oil suction negative pressure is greater than a preset value, the sealing ball 221 disengages from the sealing surface 222 and the compression amount of the compression spring 223 increases. As the oil suction negative pressure increases, the compression amount of the compression spring 223 increases, and the gap between the sealing ball 221 and the sealing surface 222 becomes larger, that is, the opening degree of the hydraulic control valve 220 becomes larger.

[0027] In other embodiments, the hydraulic control valve 220 may include an annular sealing surface, a circular movable plate, and a torsion spring connected to the edge of the movable plate. When the oil suction negative pressure is greater than a preset value, the movable plate rotates in the downstream direction of the oil against the acting force of the torsion spring, so that the movable plate disengages from the sealing surface and the hydraulic control valve 220 opens. As the oil suction negative pressure increases, the rotation amount of the movable plate increases, and the included angle between the movable plate and the sealing surface becomes larger, that is, the opening degree of the hydraulic control valve 220 becomes larger.

[0028] Such as Figure 1 As shown, in order to better collect the engine oil, the oil strainer may include a trumpet-shaped oil suction cover 230 connected to one end of the oil suction pipe 210 away from the oil pump 100. The smaller end of the oil suction cover 230 is connected to the oil suction pipe 210, and a filter screen is usually provided at the larger end of the oil suction cover 230. The length occupied by the partition 213 in the oil suction pipe 210 can be flexibly set. For example, in Figure 1 the exemplary embodiment shown, the partition 213 extends over the entire length of the oil suction pipe 210. In Figure 3 the exemplary embodiment shown, the partition 213 extends over a partial length of the oil suction pipe 210. The oil suction pipe 210 is usually made of a hard material, for example, it can be a metal pipe. Although Figure 1 and Figure 3 the shown oil suction pipe 210 is L-shaped, in other embodiments, the oil suction pipe 210 can be set to other shapes, such as S-shaped, straight-shaped, etc.

[0029] In some embodiments, the oil suction pipe 210 and the partition 213 may be of an integral structure, that is, the partition 213 is integrally formed with the pipe body of the oil suction pipe 210. Of course, in other embodiments, the partition 213 may also be provided as a part fixed to the pipe body of the oil suction pipe 210. For example, the partition 213 is fixed to the inner wall of the pipe body of the oil suction pipe 210 by welding.

[0030] The cross-sectional shape of the oil suction pipe 210 can have various choices. In order to better transport the engine oil, the first sub-chamber 211 and the second sub-chamber 212 can be set as circular cross-sectional chambers. In order to better match different working conditions of the oil pump 100 and make the oil flow rates of the oil pump 100 in low-speed and high-speed working conditions tend to be the same, one of the first sub-chamber 211 and the second sub-chamber 212 where the hydraulic control valve 220 is provided can be set to have a smaller diameter than the other. For example, if the hydraulic control valve 220 is arranged in the second sub-chamber 212, then the diameter of the second sub-chamber 212 is set to be smaller than the diameter of the first sub-chamber 211. Specifically, the ratio of the diameter of one of the first sub-chamber 211 and the second sub-chamber 212 where the hydraulic control valve 220 is provided to the diameter of the other can be between one-half and two-thirds (including the end values of the numerical range). For example, if the hydraulic control valve 220 is arranged in the second sub-chamber 212, the diameter of the second sub-chamber 212 is set to be two-thirds of the diameter of the first sub-chamber 211.

[0031] The various embodiments in this specification are described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0032] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A filter, comprising an oil suction pipe for conveying oil from an oil pan to an oil pump, characterized in that: The interior of the oil suction pipe is provided with a baffle extending along the oil flow direction in the oil suction pipe, the tube cavity of the oil suction pipe includes a first sub-cavity and a second sub-cavity separated by the baffle, and a hydraulic control valve is provided inside one of the first sub-cavity and the second sub-cavity, and the opening degree of the hydraulic control valve can change with the magnitude of the oil suction negative pressure on the oil pump side of the oil suction pipe.

2. The filter according to claim 1, characterized in that: The hydraulic control valve is arranged at a position of the oil suction pipe close to the oil pump.

3. The filter according to claim 2, characterized in that: The hydraulic control valve comprises a conical sealing surface, a sealing ball matched with the sealing surface, and a compression spring abutting against the sealing ball.

4. The filter according to claim 2, characterized in that: The hydraulic control valve comprises a circular sealing surface, a circular movable plate, and a torsion spring connected to the edge of the movable plate.

5. The filter according to claim 1, characterized in that: It comprises a trumpet-shaped oil suction cover connected to one end of the oil suction pipe away from the oil pump.

6. The filter according to claim 1, characterized in that: The baffle extends over the entire length of the oil suction pipe, or the baffle extends over a partial length of the oil suction pipe.

7. The filter according to claim 1, characterized in that: The oil suction pipe and the baffle are an integrated structure.

8. The filter according to any one of claims 1 to 7, characterized in that: The first sub-cavity and the second sub-cavity are both circular cross-section cavities.

9. The filter according to claim 8, characterized in that: One of the first sub-chamber and the second sub-chamber in which the hydraulic control valve is disposed has a smaller diameter than the other.

10. The filter according to claim 9, characterized in that: A ratio of a diameter of one of the first sub-chamber and the second sub-chamber in which the hydraulic control valve is disposed to a diameter of the other is between one-half and two-thirds.

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