CN102235401B - Oil filter for inhibiting pressure pulsation - Google Patents

Abstract

An oil filter for suppressing pressure pulsation, comprising a base, a filter element mounting sleeve, a filter element and a filter cartridge, the filter element mounting sleeve and the filter cartridge are mounted on the base, the filter element is sleeved on the filter element mounting sleeve, The filter cartridge is set on the filter element and pressed against the filter element. It is characterized in that there is a certain gap between the filter element and the filter cartridge, and copper wire is filled in the gap to enter the oil filter. The oil flows out after passing through the copper wire and the filter element. The pressure pulsation suppressing oil filter of the present invention can not only remove pollutants in the oil, maintain the cleanliness of the oil, but also effectively suppress the pressure pulsation, thereby improving the reliability of the entire hydraulic system. In addition, the oil filter has a simple structure, convenient processing and easy realization.

Description

An oil filter for suppressing pressure pulsation

technical field

The invention relates to an oil filter device in an airborne hydraulic system, in particular to an oil filter capable of suppressing pressure pulsation.

Background technique

The onboard hydraulic system is a key subsystem of the aircraft. The system converts mechanical energy into fluid pressure energy through the hydraulic pump, and transmits it to each functional subsystem through the working fluid to complete the predetermined task. Onboard hydraulic systems have a major impact on aircraft safety. According to relevant information, about 50% of aircraft accidents are caused by hydraulic system failures, so how to improve the reliability of hydraulic systems is an urgent problem to be solved.

Oil filter is an important component in the hydraulic system, it can remove the pollutants in the hydraulic oil, maintain the cleanliness of the oil, and ensure the reliability of the system components. By installing the oil filter in the appropriate part of the hydraulic system, the impurities in the hydraulic oil can be filtered, the pollution of the oil in the system can be reduced, and the hydraulic oil can be kept clean to ensure the normal operation of the system.

Existing oil filter devices are classified according to the filter mechanism of the filter material, mainly including surface type oil filter, depth type oil filter and adsorption type oil filter. The entire filtering effect of the surface type oil filter is realized by a geometric surface, and the filter element material has uniformly calibrated small holes, which can filter out impurities larger than the small hole size. The filtered impurities are trapped on the upstream side of the filter element by the oil. The filter element material of the depth type oil filter is a porous and permeable material with tortuous and circuitous channels inside. The impurities larger than the surface pore size are directly trapped on the outer surface, and the smaller pollution impurities enter the interior of the filter material, hit the channel wall, and are filtered out due to adsorption. The filter material of the adsorption oil filter can directly absorb the relevant impurities in the oil on its surface, such as magnetic oil filter.

It can be seen that in the existing oil filter, the oil directly contacts the pipe wall. Since the aircraft hydraulic system mostly uses variable displacement plunger pumps, the pulsating flow output is an inherent characteristic of hydraulic pumps. The flow pulsation is transformed into pressure pulsation through the impedance of the fluid pipeline, and the pressure pulsation directly acts on the pipe wall of the solid pipe in the form of pulsating stress, which makes the pulsating stress not only directly cause the rupture of the pipe wall, but also directly cause the pipe support structure The destruction of the structure, especially the fretting wear on the surface of the supporting structure, causes the stiffness of the support to decrease, resulting in a decrease in the natural frequency of the pipeline, fluid-solid coupling vibration, and finally leads to the failure of the pipeline system.

Contents of the invention

The purpose of the present invention is to provide an oil filter, which can suppress pressure pulsation, reduce the pulsating stress acting on the pipe wall, avoid damage to the supporting structure of the pipe, and improve the reliability of the entire system.

In order to achieve the above object, the present invention provides an oil filter for suppressing pressure pulsation, which includes a base, a filter element installation sleeve, a filter element and a filter cartridge, the filter element installation sleeve and the filter cartridge are installed on the base, and the filter element set On the filter element mounting sleeve, the filter cartridge is set on the filter element and pressed against the filter element. It is characterized in that there is a certain gap between the filter element and the filter cartridge, and the gap is filled with copper wire.

Preferably, a copper wire supporting seat is also provided in the gap, the supporting seat is fixed on the base, and the copper wire is sleeved on the copper wire supporting seat.

Preferably, the lower part of the base is a support plate, and a boss is provided on the support plate. More preferably, the support plate is square, and the boss is circular. More preferably, an outlet of the oil filter is opened at the center of the support plate, and an inlet of the oil filter is opened around the outlet. In particular, the outlet of the oil filter is opened outside the central slope of the support plate. In addition, through holes are opened at the four corners of the support plate.

Preferably, both the filter element mounting sleeve and the base, and the filter cartridge and the base are screwed together.

Considering the airtightness of the entire oil filter, preferably, sealing treatment is performed at the joints of the filter element installation sleeve and the base and the joints of the filter element installation sleeve and the filter element respectively. More preferably, these connection parts can be sealed in the following manner, that is, a first sealing ring is provided at the connection part of the filter element installation sleeve and the base, and a first sealing ring is provided at the connection part of the filter element installation sleeve and the filter element. There is a second sealing ring.

Preferably, a sealing process can also be performed at the connecting portion of the filter cartridge and the base. More preferably, a third sealing pattern is provided at the connecting portion of the filter cartridge and the upper part of the base, and an annular groove is opened on the outer wall below the filter cartridge, and the combined sealing ring is set in the annular groove Inside.

When in use, the oil filter of the present invention is installed at the outlet of the pump, and the oil flows out of the pump and flows into the oil filter through the inlet of the filter element mounting seat, and flows through the copper wire and the filter element, and from The outlet of the oil filter flows out, thus completing the function of filtering the oil. Since the appropriate copper wire is filled between the filter element and the filter cartridge, this changes the pulsation frequency of the oil at the outlet of the pump, thereby achieving the purpose of suppressing its pressure pulsation.

Therefore, the pressure pulsation suppressing oil filter of the present invention can not only remove pollutants in the oil, maintain the cleanliness of the oil, but also effectively suppress the pressure pulsation, thereby improving the reliability of the entire hydraulic system. In addition, the oil filter has a simple structure, convenient processing and easy realization.

Instructions attached

Fig. 1 is the front view of the embodiment of oil filter of the present invention;

Fig. 2 is the top view of the embodiment of oil filter of the present invention;

Fig. 3 is the bottom view of the embodiment of oil filter of the present invention;

Fig. 4 is a sectional view of an embodiment of the oil filter of the present invention.

Detailed ways

As shown in FIG. 1 , the oil filter for suppressing pressure pulsation is formed by fitting the filter cartridge 8 on the base 2 .

As shown in Figures 2-4, the lower part of the base 2 is a square plate 21 with a circular boss on the plate and an internal thread on the upper side of the boss. As shown in Figure 3, a through hole 22 is respectively provided at the four corners of the square support plate 21, and there are threads on the top of the through hole 22, so that the oil filter of the present invention is installed on other parts to facilitate the use of the oil filter of the present invention .

As shown in FIG. 3 , an oil filter inlet 23 is opened outside the center slope of the square support plate 21 , and an oil filter outlet 24 is opened at the center of the square support plate 21 . As shown in FIG. 4 , a first sealing ring 3 is installed on the lower inner side of the outlet 24 , and the upper side of the outlet 24 is threaded. One end of the oil filter mounting sleeve 7 is also threaded, so that the oil filter mounting sleeve 7 is threadedly matched with the outlet 24 of the base 2 and thus fixed on the base 2 .

As shown in FIG. 4 , the filter element 1 is set on the filter element installation sleeve 7 and is in contact with the base 2 . A second sealing ring 4 is provided at the connecting portion between the filter element installation sleeve 7 and the filter element 1 .

As shown in FIG. 4 , the filter cartridge 8 is a cylindrical cartridge, and an annular groove 81 is opened on the outer wall of the opening side, and the combined sealing ring 5 is embedded in the annular groove 81 . Threads are provided on the upper side of the annular groove 81 , and the threads cooperate with the internal threads of the boss of the base 2 , so that the filter cartridge 8 is installed on the base 2 and compresses the filter element 1 . In addition, a third sealing figure 6 is provided at the contact position between the filter cartridge and the upper part of the boss.

As shown in FIG. 4 , there is a certain gap between the filter element 1 and the filter cartridge 8 , and the copper wire support seat 9 is installed in the gap, and its upper part is in contact with the inner bottom surface of the filter cartridge 8 , and its lower part is in contact with the base 2 . The thin copper wire 10 is sleeved on the copper wire supporting base 9 .

When in use, the oil filter of the present invention is installed at the outlet of the pump through the through hole 22 on the base 2, and the oil flows out from the pump and flows into the oil filter through the inlet 23 of the base, and After flowing through the copper wire 10 and the filter element 1, it flows out from the outlet 24 of the oil filter, thus completing the function of filtering the oil. Since the appropriate copper wire is filled between the filter element and the filter cartridge, this changes the pulsation frequency of the oil at the outlet of the pump, thereby achieving the purpose of suppressing its pressure pulsation.

The technical content and technical characteristics of the present invention have been disclosed above, but it can be understood that under the creative idea of the utility model, those skilled in the art can make various changes and improvements to the above structure, but all belong to the protection scope of the present invention. The description of the above embodiments is illustrative rather than restrictive, and the protection scope of the present invention is determined by the claims.

Claims (17)

1. An oil filter for suppressing pressure pulsation, comprising a base (2), a filter element mounting sleeve (7), a filter element (1) and a filter cartridge (8), the filter element mounting sleeve (7) and the filter cartridge (8) ) is installed on the base (2), the filter element (1) is set on the filter element installation sleeve (7), the filter cartridge (8) is set on the filter element (1) and presses the The filter element (1) is characterized in that there is a certain gap between the filter element (1) and the filter cartridge (8), and copper wire (10) is filled in the gap, and the oil entering the oil filter After flowing through the copper wire (10) and the filter element (1), it flows out. 2. The oil filter according to claim 1, characterized in that, a copper wire support seat (9) is also provided in the gap, and the copper wire support seat (9) is fixed on the base (2), The copper wire is sleeved on the copper wire supporting seat (9). 3. The oil filter according to claim 1 or 2, characterized in that, the lower part of the base (2) is a support plate (21), and a boss is arranged on the support plate. 4. The oil filter according to claim 3, wherein the support plate is square. 5. The oil filter according to claim 3, wherein the boss is in the shape of a ring. 6. The oil filter according to claim 3, characterized in that, the center of the support plate (21) is provided with an outlet (24) of the oil filter, and an inlet (23) of the oil filter is provided around the outlet . 7. The oil filter according to claim 6, characterized in that, the outlet (24) of the oil filter is set outside the central slope of the support plate (21). 8. The oil filter according to claim 3, characterized in that, through holes (22) are opened at the four corners of the support plate (21). 9. The oil filter according to claim 1 or 2, characterized in that, the filter element mounting sleeve (7) and the base (2) are screwed together. 10. The oil filter according to claim 1 or 2, characterized in that, the filter cartridge (8) and the base (2) are screwed together. 11. The oil filter according to claim 1 or 2, characterized in that, sealing treatment is performed at the connecting portion of the filter element installation sleeve (7) and the base (2). 12. The oil filter according to claim 11, characterized in that, a first sealing ring (3) is provided at the connecting portion of the filter element installation sleeve (7) and the base (2). 13. The oil filter according to claim 1 or 2, characterized in that, sealing treatment is performed at the connecting portion of the filter element installation sleeve (7) and the filter element (1). 14. The oil filter according to claim 13, characterized in that, a second sealing ring (4) is provided at the connecting portion of the filter element installation sleeve (7) and the filter element (1). 15. The oil filter according to claim 1 or 2, characterized in that a sealing process is performed at the connecting portion of the filter cartridge (8) and the base (2). 16. The oil filter according to claim 15, characterized in that, a third sealing ring (6) is provided at the connection position between the filter cartridge (8) and the upper part of the base (2). 17. The oil filter according to claim 15, characterized in that, an annular groove (81) is opened on the outer wall below the filter cartridge (8), and the combined sealing ring (5) is set in the annular groove (81) )Inside.