Pressure filter and closed pump hydraulic system

Abstract

The utility model discloses a pressure filter and a closed pump hydraulic system, and particularly relates to the technical field of closed pumps, the pressure filter comprises a closed pump, an oil recharging pump, an overflow valve and a pressure filter, the closed pump is connected with an actuating mechanism, the oil recharging pump is arranged on a pipeline between the closed pump and an oil tank, the pressure filter is arranged between the oil recharging pump and the closed pump, and the overflow valve is connected with the pressure filter. The pressure filter and the overflow valve are arranged in parallel, an oil inlet of the overflow valve is communicated with an oil inlet of the pressure filter, an oil outlet of the overflow valve is communicated with the oil tank, and when the overflow valve reaches preset pressure, oil conveyed by the oil supplementing pump is directly conveyed back to the oil tank through the overflow valve. The filter element comprises a filter element body and a protective layer, and the protective layer is fixedly arranged outside the filter element body in a sleeving mode. The utility model has the capability of resisting counter impact, can reduce the damage caused by system impact, and is light in weight.

Description

TECHNICAL FIELD

[0001] The utility model relates to closed pump technical field especially relates to a pressure filter and closed pump hydraulic system. BACKGROUND

[0002] The pressure filter is mainly used for filtering impurities in liquid medium and filters liquid under pressure. It intercepts impurities such as particles and dirt through filter elements such as filter screens to ensure that the filtered liquid meets certain cleanliness standards. The pressure filter can be installed in the circulating pipeline of the closed pump to protect the closed pump and other system components from impurities and improve the reliability and service life of the entire system.

[0003] The pressure filter has two installation methods: one is installed on the hydraulic pipeline, and the other is installed on the closed pump, using the closed pump as a mounting bracket. The disadvantage of installing the pressure filter on the hydraulic pipeline is that it requires a certain installation space, increases the pipeline and hydraulic joints, and is inconvenient to maintain. However, installing the pressure filter on the closed pump does not have the above problems and can reduce joint oil leakage pollution when replacing the filter element. However, the disadvantage is that the initial pressure drop is large. When the filter starts working, it needs to enter the working state, so there will be an initial pressure drop, which will cause the system pressure to drop and affect the working efficiency of the hydraulic machinery. UTILITY MODEL CONTENTS

[0004] The utility model aims to provide a pressure filter and closed pump hydraulic system to solve the problems of the prior art, have anti-impact ability, can reduce damage caused by system impact, and are light in weight.

[0005] To achieve the above-mentioned purpose, the utility model provides the following scheme:

[0006] The utility model provides a pressure filter, which comprises a shell and a filter element, the filter element is filled in the shell, the material of the shell is extruded aluminum, the filter element comprises a filter element body and a protective layer, and the protective layer is fixedly sleeved outside the filter element body.

[0007] Preferably, the shell comprises a mounting seat and a filter cartridge, the mounting seat is sealingly and fixedly connected with the filter cartridge, the filter element is installed in the filter cartridge, the mounting seat is provided with an oil inlet and an oil outlet, oil enters the filter cartridge from the oil inlet, and flows out from the oil outlet after being filtered by the filter element.

[0008] Preferably, one end of the filter element is attached to the bottom surface of the filter cartridge, the other end is attached to the mounting seat, the protective layer has an annular gap between the inner side wall of the filter cartridge, the oil inlet is communicated with the annular gap, the filter element body is in the shape of an annular cylinder, the filter element body has a central through hole, and the oil outlet is communicated with the central through hole.

[0009] Preferably, the protective layer is a metal filter screen.

[0010] Preferably, the material of the filter core body is glass fiber.

[0011] The utility model discloses still provide a closed type pump hydraulic system, including closed type pump, oil supplement pump, overflow valve and pressure filter of the, the closed type pump is connected with actuating mechanism, be provided with the oil supplement pump on the pipeline between the closed type pump and oil tank, be provided with the pressure filter between the oil supplement pump with the closed type pump, the pipeline of pressure filter with the oil supplement pump is connected with overflow pipeline, be provided with the overflow valve on the overflow pipeline, the other end of overflow pipeline is connected with oil tank, when the pressure difference of pressure filter import and export reaches the overflow valve preset pressure, the oil liquid of oil supplement pump is transported and is transported back to the oil tank through the overflow pipeline.

[0012] Preferably, the overflow valve is a cartridge type low pressure overflow valve.

[0013] Preferably, further comprising a high pressure overflow valve, the high pressure overflow valve is arranged on the pipeline between the oil supplement pump and the closed type pump.

[0014] Preferably, further comprising an oil supplement pump overflow valve, the oil supplement pump overflow valve is arranged on the passage between the oil supplement pump and the oil tank.

[0015] The utility model discloses relative to prior art has obtained following technical effect:

[0016] The utility model provides a pressure filter and closed type pump hydraulic system, filter core fills in the shell, the material of shell is extruded aluminium, the density of extruded aluminium is greater than the density of cast aluminium selected in prior art, under the same pressure, the thickness of filter cartridge is thin, and the weight is lighter, the protective layer is fixedly covered in filter core body outside, and the protective layer has the resistance to impact ability, can reduce the probability of the swelling of filter under the larger instantaneous impact, effectively protects the damage caused by system impact. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will be briefly introduced the drawing needed to be used in the embodiment, obviously, the drawing in the following description only is some embodiments of the utility model, for ordinary skilled person in the art, under the premise of not paying the creative labor, still can obtain other drawings according to these drawings.

[0018] Figure 1 It is the structural diagram of pressure filter;

[0019] Figure 2 It is Figure 1Sectional view along the middle AA;

[0020] Figure 3 for Figure 1 A sectional view along the middle edge BB;

[0021] Figure 4 This is a hydraulic schematic diagram of a closed-loop pump hydraulic system.

[0022] In the diagram: 1-Pressure filter; 11-Mounting base; 12-Filter cartridge; 13-Filter element; 131-Filter element body; 132-Protective layer; 14-Inlet pipe; 15-Outlet pipe; 2-Closed pump; 3-Maintenance pump; 4-Relief valve; 5-High pressure relief valve; 6-Maintenance pump relief valve. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] The purpose of this invention is to provide a pressure filter and a closed-loop pump hydraulic system to solve the problems existing in the prior art. It has the ability to withstand back impact, can reduce damage caused by system impact, and is lightweight.

[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Example 1

[0027] This embodiment provides a pressure filter, such as Figures 1-3 As shown, the filter cartridge 12 includes a housing and a filter element 13. The filter element 13 is filled inside the housing, which is made of extruded aluminum. The filter element 13 includes a filter element body 131 and a protective layer 132, which is fixedly fitted onto the filter element body 131. The housing is made of extruded aluminum 6063, which has a higher density than cast aluminum selected in the prior art. Under the same pressure, the filter cartridge 12 is thinner and lighter. The protective layer 132 is fixedly fitted onto the filter element body 131 and has the ability to withstand back impacts. Under large instantaneous impacts, it can reduce the probability of the filter swelling and effectively protect against damage caused by system impacts.

[0028] In a further preferred embodiment of this invention, the housing includes a mounting base 11 and a filter cartridge 12. The mounting base 11 is sealed and fixedly connected to the filter cartridge 12. The filter element 13 is installed inside the filter cartridge 12. The mounting base 11 is provided with an oil inlet pipe 14 and an oil outlet pipe 15. The oil enters the filter cartridge 12 from the oil inlet pipe 14, is filtered by the filter element 13, and then flows out from the oil outlet pipe 15.

[0029] In a further preferred embodiment of this invention, one end of the filter element 13 is attached to the bottom surface of the filter cartridge 12, and the other end is attached to the mounting base 11. An annular gap exists between the protective layer 132 and the inner wall of the filter cartridge 12, and the oil inlet communicates with this annular gap. The filter element body 131 has an annular cylindrical structure and a central through-hole, with the oil outlet communicating with this central through-hole. The pressure filter 1 filters from the outside in, has a large dirt-holding capacity, and ensures that its working oil reaches the required contamination level.

[0030] In a further preferred embodiment of this invention, the protective layer 132 is a metal filter screen. The pressure difference and resistance to back-impact pressure difference of the filter element 13 are greater than 25 bar.

[0031] In a further preferred embodiment of this example, the filter element 13 is made of glass fiber, has a filtration accuracy of 10 μm, and a filtration ratio β ≥ 200.

[0032] Example 2

[0033] This embodiment provides a closed-loop pump hydraulic system, such as Figure 4As shown, including closed pump 2, oil supplement pump 3, overflow valve 4 and the pressure filter 1 of embodiment 1, the closed pump 2 is connected with the actuator, the pipeline between the closed pump 2 and the oil tank is provided with the oil supplement pump 3, the pressure filter 1 is arranged between the oil supplement pump 3 and the closed pump 2, the pipeline of the pressure filter 1 and the oil supplement pump 3 is connected with the overflow pipeline, the overflow pipeline is provided with the overflow valve 4, and the other end of the overflow pipeline is communicated with the oil tank; when the pressure difference between the inlet and outlet of the pressure filter 1 reaches the preset pressure of the overflow valve 4, the oil transported by the oil supplement pump 3 is transported back to the oil tank through the overflow pipeline. The overflow valve is a plug-in low-pressure overflow valve. The hydraulic filter is composed of the pressure filter 1 and the plug-in low-pressure overflow valve, the plug-in low-pressure overflow valve is installed on the bypass parallel to the pressure filter 1, and the pressure difference before and after the pressure filter 1 acts on the plug-in low-pressure overflow valve; when the oil temperature is low and the viscosity is high, the pressure difference before and after the pressure filter 1 rises and reaches the set pressure of the plug-in low-pressure overflow valve, the hydraulic oil overcomes the force of the pressure spring, pushes the valve core to move upwards, and makes the oil inlet and the oil return port of the plug-in low-pressure overflow valve communicate; at this time, the oil supplement pump 3 and the plug-in low-pressure overflow valve 4 form a loop, and the oil transported from the oil supplement pump 3 to the filter is transported to the oil tank. The heat generated by overflow makes the oil temperature rise rapidly, and when the oil reaches the appropriate viscosity, the plug-in low-pressure overflow valve is closed, and the oil of the oil supplement pump 3 can be sent to the control valve side through the pressure filter 1, and the closed pump 2 starts to work, so that the damage of the oil supplement pump 3 and the closed pump 2 caused by excessive viscosity of the oil is prevented.

[0034] It is further preferred in the embodiment of the present embodiment that the closed pump hydraulic system further comprises a high-pressure overflow valve 5, and the high-pressure overflow valve 5 is arranged on the pipeline between the oil supplement pump 3 and the closed pump 2. The oil pressed by the oil supplement pump 3 supplements the closed circuit through the high-pressure overflow valve 5.

[0035] It is further preferred in the embodiment of the present embodiment that the closed pump hydraulic system further comprises an oil supplement pump overflow valve 6, and the oil supplement pump overflow valve 6 is arranged on the pipeline between the oil supplement pump 3 and the oil tank. Part of the hydraulic oil pressed from the oil supplement pump 3 flows back to the oil tank after overflowing through the oil supplement pump overflow valve 6.

[0036] The principle and implementation mode of the specific examples are described in the utility model, and the above embodiment is only used for helping to understand the method and core idea of the utility model; meanwhile, according to the idea of the utility model, the specific implementation mode and application range will be changed by the general technical personnel in the field. As described above, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A pressure filter characterized by: The filter cartridge is filled in the shell, the shell is made of extruded aluminum, and the filter cartridge comprises a filter cartridge body and a protective layer.

2. The pressure filter of claim 1, wherein: The shell comprises a mounting seat and a filter cylinder, the mounting seat is sealingly and fixedly connected with the filter cylinder, the filter cartridge is mounted in the filter cylinder, the mounting seat is provided with an oil inlet and an oil outlet, oil enters the filter cylinder from the oil inlet, is filtered by the filter cartridge, and then flows out from the oil outlet.

3. The pressure filter of claim 2, wherein: One end of the filter cartridge is attached to the bottom surface of the filter cylinder, the other end is attached to the mounting seat, the protective layer has an annular gap with the inner side wall of the filter cylinder, the oil inlet is in communication with the annular gap, the filter cartridge body is in the shape of an annular cylinder, the filter cartridge body has a central through hole, and the oil outlet is in communication with the central through hole.

4. The pressure filter of claim 1, wherein: The protective layer is a metal filter screen.

5. The pressure filter of claim 1, wherein: The filter cartridge body is made of glass fiber.

6. A closed pump hydraulic system characterized by: The pressure filter comprises a closed pump, an oil supplement pump, an overflow valve and the pressure filter according to any one of claims 1-5, the closed pump is connected with an actuator, the oil supplement pump is arranged on a pipeline between the closed pump and an oil tank, the pressure filter is arranged between the oil supplement pump and the closed pump, an overflow pipeline is connected to the pipeline of the oil supplement pump, the overflow valve is arranged on the overflow pipeline, the other end of the overflow pipeline is in communication with the oil tank, and when the pressure difference between the inlet and the outlet of the pressure filter reaches the preset pressure of the overflow valve, the oil delivered by the oil supplement pump is delivered back to the oil tank through the overflow pipeline.

7. The closed pump hydraulic system of claim 6, wherein: The overflow valve is a plug-in low-pressure overflow valve.

8. The closed pump hydraulic system of claim 6, wherein: The pressure filter further comprises a high-pressure overflow valve, which is arranged on the pipeline between the oil supplement pump and the closed pump.

9. The closed pump hydraulic system of claim 8, wherein: The pressure filter further comprises an oil supplement pump overflow valve, which is arranged on the pipeline between the oil supplement pump and the oil tank.

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