Pressure relief equipment for protecting hydraulic oil return filter element

Abstract

The utility model relates to the technical field of hydraulic pressure, and discloses a pressure relief device for protecting a hydraulic oil return filter element, which comprises an upper cover and a lower cover, a pair of pressure relief pipes is arranged on the side wall of the upper cover, each pair of pressure relief pipes is C-shaped, a collecting box is arranged at the tail end of each pressure relief pipe, and a sealing plug is movably inserted at the connecting port of each collecting box and the corresponding pressure relief pipe. An oil return filter element is arranged at the bottom of the lower cover, and a protection assembly is arranged in the collecting box. According to the utility model, when the oil return filter element is blocked, hydraulic oil exists in the upper cover, and the oil pressure is gradually increased along with accumulation, so that the sealed sealing plug is opened, the hydraulic oil flows into the collecting box at the moment, the purpose of preliminary storage is achieved, and in the storage process, the liquid level in the collecting box rises to push the floating ball to move upwards, so that the oil return filter element is prevented from being blocked. And finally, the baffle and the dredging rod are pushed to move upwards, the baffle supports the oil return filter element, the pressure of the oil return filter element is reduced, the oil return filter element is dredged through the dredging rod, and normal use of equipment is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic pressure, and in particular relates to a pressure relief device for protecting a hydraulic oil return filter element. Background Art

[0002] The hydraulic return oil filter is installed in the oil circuit of the hydraulic system to remove metal powder and other mechanical impurities caused by wear of various components in the hydraulic system to keep the oil circuit clean and extend the life of the hydraulic system. At present, the end caps and frames of traditional return oil filters are mostly made of metal. Metal accessories often need surface treatment, that is, surface coating. The surface coating is easy to fall off after a period of use. The fallen coating fragments will pollute the system oil. When the coating fragments are serious, the return oil filter will be blocked. When the filter is blocked, the hydraulic oil will not be able to return to the oil tank in time, thereby generating great pressure at the filter. When the pressure reaches a certain level, the filter may be damaged, resulting in damage to the filter that was originally only blocked, affecting the normal use of the device.

[0003] In view of this, the present utility model is proposed. Utility Model Content

[0004] To solve the problem that when the filter element is blocked, the hydraulic oil will not be able to return to the oil tank in time, thereby generating great pressure at the filter element. When the pressure reaches a certain level, the filter element may be damaged, resulting in damage to the originally blocked filter element, affecting the normal use of the device.

[0005] The basic concept of the technical solution adopted in this utility model is:

[0006] A pressure relief device for protecting a hydraulic oil return filter element, comprising an upper cover and a lower cover, a pair of pressure relief pipes are installed on the side wall of the upper cover, each pair of pressure relief pipes is C-shaped, a collection box is installed at the end of the pressure relief pipe, a sealing plug is movably connected at the connection port of the collection box and the pressure relief pipe, an oil return filter element is arranged at the bottom of the lower cover, and a protection component is arranged inside the collection box;

[0007] The protection component includes a hollow float, which is placed inside the collection box and is equipped with an insertion rod. The insertion rod movably penetrates the lower cover shell and is connected thereto. A baffle is installed on the top of the insertion rod, and the baffle is adapted to the size of the return oil filter element. A plurality of pairs of clearing rods are installed on the baffle, and the clearing rods are aligned with the filter holes inside the return oil filter element.

[0008] As a preferred embodiment of the utility model, the upper cover and the lower cover are both conical, and the relative surfaces of the upper cover and the lower cover are fitted together and fixedly connected by bolts. An oil inlet is installed on the top of the upper cover, and the oil inlet is communicated with the bottom chamber of the upper cover.

[0009] As a preferred embodiment of the utility model, a discharge pipe is vertically fixedly installed at the bottom of the lower cover, and the bottom of the discharge pipe is movably connected by a plug rod, a delivery pipe is installed on the side wall of the discharge pipe, and the lower cover, the discharge pipe and the internal chambers of the delivery pipe are interconnected.

[0010] As a preferred embodiment of the utility model, a partition is installed through the bottom of the collecting box, a limit rod is installed horizontally on the partition, and the end of the limit rod is placed inside the pressure relief pipe, a sealing plug is slidably installed on the outer wall of the limit rod, and a pressure control spring is sleeved on the outer wall of the limit rod, and the two ends of the pressure control spring are respectively clamped on the side wall of the sealing plug and the side wall of the partition.

[0011] As a preferred embodiment of the utility model, a limit plate is installed on the outer wall of the insertion rod located inside the collection box, the diameter of the limit plate is larger than the diameter of the insertion rod, and the distance from the limit plate to the top of the collection box is equal to the distance from the baffle to the bottom of the return oil filter element.

[0012] As a preferred embodiment of the utility model, a mounting plate is provided on the outer wall of the oil return filter element, the bottom of the mounting plate is overlapped on the boss of the lower cover, screws are screwed between the mounting plate and the boss, and a gasket is clamped at the connection.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] When the oil return filter element is clogged, the refluxed hydraulic oil exists inside the upper cover, and the oil pressure gradually increases with the accumulation, thereby opening the sealing plug and allowing the hydraulic oil to flow into the collection box at this time, thereby achieving the purpose of initial storage. During the storage process, the liquid level inside the collection box rises, pushing the float ball to move upward, and finally pushing the baffle plate and the dredging rod to move upward. The baffle plate lifts the oil return filter element, reducing the pressure on the oil return filter element, and the oil return filter element is dredged by the dredging rod to ensure the normal use of the equipment.

[0015] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In the attached picture:

[0017] Figure 1 It is a three-dimensional structural schematic diagram of a pressure relief device for protecting a hydraulic oil return filter element;

[0018] Figure 2 A schematic diagram of the internal structure of a lower cover of a pressure relief device for protecting a hydraulic oil return filter element;

[0019] Figure 3 It is a partial cross-sectional view of a pressure relief device for protecting a hydraulic oil return filter element;

[0020] Figure 4 A pressure relief device for protecting the hydraulic oil return filter element Figure 3 Enlarged view of point A in the middle.

[0021] In the figure: 1. Upper cover; 2. Oil inlet; 3. Pressure relief pipe; 4. Collecting box; 5. Lower cover; 6. Discharge pipe; 7. Delivery pipe; 8. Partition; 9. Hollow float; 10. Insert rod; 11. Limit plate; 12. Baffle; 13. Clearing rod; 14. Return oil filter element; 15. Mounting plate; 16. Limit rod; 17. Sealing plug; 18. Pressure control spring. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model.

[0023] like Figures 1 to 4 As shown, a pressure relief device for protecting a hydraulic return oil filter element comprises an upper cover 1 and a lower cover 5, a pair of pressure relief pipes 3 are installed on the side wall of the upper cover 1, each pair of pressure relief pipes 3 is C-shaped, a collecting box 4 is installed at the end of the pressure relief pipe 3, a sealing plug 17 is movably connected at the connection between the collecting box 4 and the pressure relief pipe 3, a return oil filter element 14 is arranged at the bottom of the lower cover 5, and a protective component is arranged inside the collecting box 4;

[0024] The protection assembly includes a hollow float 9, which is placed inside the collection box 4, and a plug rod 10 is installed on the hollow float 9. The plug rod 10 is rectangular, and the plug rod 10 is movably inserted into the shell of the lower cover 5, and a baffle 12 is installed on the top of the plug rod 10, and the baffle 12 is adapted to the size of the return oil filter element 14, and a plurality of pairs of dredging rods 13 are installed on the baffle 12, and the dredging rods 13 are aligned with the filter holes inside the return oil filter element 14. When the return oil filter element is blocked, the refluxed hydraulic oil exists inside the upper cover, and the oil pressure gradually increases with the accumulation, so that the sealing plug is opened, so that the hydraulic oil at this time flows into the collection box, achieving the purpose of initial storage. During the storage process, the liquid level inside the collection box rises, pushing the float to move upward, and finally pushing the baffle and the dredging rod to move upward. The baffle lifts the return oil filter element, reducing the pressure of the return oil filter element, and the return oil filter element is also dredged by the dredging rod to ensure the normal use of the equipment.

[0025] like Figures 1 to 4 As shown, in a specific embodiment, the upper cover 1 and the lower cover 5 are both conical, and the relative surfaces of the upper cover 1 and the lower cover 5 are fitted together and fixedly connected by bolts, and an oil inlet 2 is installed on the top of the upper cover 1, and the oil inlet 2 is connected to the bottom chamber of the upper cover 1. The upper cover 1 and the lower cover 5 can be completely closed together to ensure the sealing of the equipment, and the oil inlet 2 is convenient for subsequent oil inlet.

[0026] like Figures 1 to 4 As shown, further, a discharge pipe 6 is vertically fixedly installed at the bottom of the lower cover 5, and the bottom of the discharge pipe 6 is movably plugged by a plug rod 10, and a delivery pipe 7 is installed on the side wall of the discharge pipe 6, and the internal chambers of the lower cover 5, the discharge pipe 6 and the delivery pipe 7 are interconnected. The discharge pipe 6 and the delivery pipe 7 can discharge the internal hydraulic oil to the outside.

[0027] like Figures 1 to 4 As shown, a partition 8 is installed through the bottom of the collection box 4, and a limit rod 16 is installed horizontally on the partition 8, and the end of the limit rod 16 is placed inside the pressure relief pipe 3. A sealing plug 17 is slidably installed on the outer wall of the limit rod 16, and a pressure control spring 18 is sleeved on the outer wall of the limit rod 16, and the two ends of the pressure control spring 18 are respectively clamped on the side wall of the sealing plug 17 and the side wall of the partition 8. After the return oil filter 14 is blocked, the refluxed hydraulic oil exists inside the upper cover 1, and the oil pressure gradually increases with the accumulation. At this time, the inside of the pressure relief pipe 3 is subjected to a large pressure. When the pressure is greater than the elastic force of the pressure control spring 18, the sealing plug 17 will be pushed to move outward along the limit rod 16, and the sealing plug 17 will be separated from the pressure relief pipe 3 at this time, causing the high-pressure hydraulic pressure to move from the bottom pressure relief pipe 3 to the inside of the collection box 4, completing the initial pressure relief, thereby achieving the protection effect.

[0028] like Figures 1 to 4 As shown, a limit plate 11 is installed on the outer wall of the plunger 10 located inside the collection box 4. The diameter of the limit plate 11 is larger than the diameter of the plunger 10. The distance from the limit plate 11 to the top of the collection box 4 is equal to the distance from the baffle 12 to the bottom of the return oil filter 14. When there is a large amount of hydraulic oil inside the collection box 4, the hollow floating ball 9 inside is driven to move upward, and the plunger 10 is driven to move upward synchronously, so that the limit plate 11 on the surface of the plunger 10 is finally fitted with the inside of the collection box 4, which plays a role of limiting. At this time, the baffle 12 on the top of the plunger 10 moves upward synchronously, and the baffle 12 can finally press the bottom of the return oil filter 14, thereby reducing the pressure on the top of the return oil filter 14 and reducing the occurrence of breakage of the return oil filter 14. At this time, the dredging rod 13 moves upward synchronously and can be plugged into the inside of the return oil filter 14 to dredge the blocked position inside the return oil filter 14.

[0029] like Figures 1 to 4 As shown, the outer wall of the return oil filter 14 is provided with a mounting plate 15, the bottom of the mounting plate 15 is overlapped on the boss of the lower cover 5, and screws are screwed between the mounting plate 15 and the boss, and a gasket is clamped at the connection. It is convenient to install the return oil filter 14, and the gasket improves the sealing of the installation.

[0030] The implementation principle of a pressure relief device for protecting a hydraulic oil return filter element in this embodiment is as follows:

[0031] When the return oil filter 14 is clogged, the refluxed hydraulic oil exists inside the upper cover 1, and the oil pressure gradually increases with the accumulation. At this time, the inside of the pressure relief pipe 3 is subjected to a large pressure. When the pressure is greater than the elastic force of the pressure control spring 18, the sealing plug 17 will be pushed to move outward along the limit rod 16, and the sealing plug 17 will be separated from the pressure relief pipe 3 at this time, causing the high-pressure hydraulic pressure to move from the bottom pressure relief pipe 3 to the inside of the collection box 4, completing the initial pressure relief, thereby achieving a protective effect.

[0032] And when there is a large amount of hydraulic oil in the collecting box 4, the hollow float 9 inside is driven to move upward, and the plug rod 10 is driven upward simultaneously, and finally the limit plate 11 on the surface of the plug rod 10 is fitted with the inside of the collecting box 4, which plays a limiting role, and at this time the baffle 12 on the top of the plug rod 10 moves upward synchronously, and the baffle 12 can finally press the bottom of the return oil filter 14, thereby reducing the pressure on the top of the return oil filter 14 and reducing the occurrence of breakage of the return oil filter 14, and at this time the dredging rod 13 moves upward synchronously and can be inserted into the return oil filter 14, so as to dredge the blockage inside the return oil filter 14, thereby ensuring subsequent normal use.

Claims

1. A pressure relief device for protecting a hydraulic oil return filter element, comprising an upper cover (1) and a lower cover (5), characterized in that: A pair of pressure relief pipes (3) are installed on the side wall of the upper cover (1), each pair of the pressure relief pipes (3) is C-shaped, a collecting box (4) is installed at the end of the pressure relief pipe (3), a sealing plug (17) is movably connected at the connection between the collecting box (4) and the pressure relief pipe (3), an oil return filter (14) is arranged at the bottom of the lower cover (5), and a protective component is arranged inside the collecting box (4); The protection component comprises a hollow floating ball (9), the hollow floating ball (9) is placed inside the collecting box (4), and a plug rod (10) is installed on the hollow floating ball (9), the plug rod (10) is rectangular, the plug rod (10) movably penetrates the outer shell of the plug-in lower cover (5), and a baffle (12) is installed on the top of the plug rod (10), and the baffle (12) is adapted in size to the return oil filter element (14), and a plurality of pairs of dredging rods (13) are installed on the baffle (12), and the dredging rods (13) are aligned with the filter holes inside the return oil filter element (14).

2. A pressure relief device for protecting a hydraulic oil return filter according to claim 1, characterized in that: The upper cover (1) and the lower cover (5) are both conical, and the relative surfaces of the upper cover (1) and the lower cover (5) are fitted together and fixedly connected by bolts. An oil inlet (2) is installed on the top of the upper cover (1), and the oil inlet (2) is communicated with the bottom chamber of the upper cover (1).

3. A pressure relief device for protecting a hydraulic oil return filter according to claim 1, characterized in that: A discharge pipe (6) is vertically fixedly mounted on the bottom of the lower cover (5), and the bottom of the discharge pipe (6) is movably plugged by a plug rod (10). A delivery pipe (7) is mounted on the side wall of the discharge pipe (6), and the internal chambers of the lower cover (5), the discharge pipe (6) and the delivery pipe (7) are interconnected.

4. A pressure relief device for protecting a hydraulic oil return filter according to claim 1, characterized in that: A partition (8) is installed through the bottom of the collecting box (4), a limit rod (16) is installed transversely on the partition (8), and the end of the limit rod (16) is placed inside the pressure relief pipe (3), a sealing plug (17) is slidably installed on the outer wall of the limit rod (16), and a pressure control spring (18) is sleeved on the outer wall of the limit rod (16), and the two ends of the pressure control spring (18) are respectively clamped on the side wall of the sealing plug (17) and the side wall of the partition (8).

5. The pressure relief device for protecting a hydraulic oil return filter according to claim 1, characterized in that: A limit plate (11) is installed on the outer wall of the insertion rod (10) located inside the collection box (4); the diameter of the limit plate (11) is greater than the diameter of the insertion rod (10); and the distance from the limit plate (11) to the top of the collection box (4) is equal to the distance from the baffle plate (12) to the bottom of the return oil filter element (14).

6. A pressure relief device for protecting a hydraulic oil return filter according to claim 1, characterized in that: The outer wall of the oil return filter element (14) is provided with a mounting plate (15), the bottom of the mounting plate (15) is overlapped on the boss of the lower cover (5), screws are screwed between the mounting plate (15) and the boss, and a gasket is clamped at the connection.

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