Hydraulic oil tank respirator of electro-hydraulic actuating mechanism

Abstract

The invention discloses a hydraulic oil tank breather of an electro-hydraulic actuating mechanism, which comprises a breather body, a joint, a first 90-degree elbow, a second 90-degree elbow and a straight pipe, during assembly, the lower end of the joint is connected with an oil tank air outlet pipe, and the upper end of the joint is connected with the first 90-degree elbow; one end of the second 90-degree elbow is connected with the first 90-degree elbow, the other end of the second 90-degree elbow is opened upwards and connected with the lower end of the straight pipe, and the upper end of the straight pipe is connected with the respirator body. The device is simple in structure, easy to manufacture and install, low in cost and free of maintenance. During application, oil columns sprayed out of the exhaust hole of the oil return pipe can be effectively prevented from impacting the inner wall of an oil tank or a pipeline to generate oil, oil is prevented from flowing out of the respirator, the problem that an oil pump is damaged due to reduction of the oil level in the oil tank is avoided, and normal operation of an electro-hydraulic actuator is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of oil tanks, and in particular relates to a hydraulic oil tank breather of an electro-hydraulic actuator. Background Art

[0002] The hydraulic oil tank is an indispensable oil storage container for hydraulic equipment. When the piston rod of the hydraulic cylinder extends, the hydraulic pump sends the hydraulic oil to the hydraulic cylinder, and when the piston rod of the hydraulic cylinder retracts, the hydraulic oil returns to the hydraulic oil tank. Therefore, the hydraulic oil tank needs to be equipped with a breather to communicate with the outside so that the air in the tank can flow in and out with the hydraulic oil.

[0003] In the hydraulic oil tank breather structure of the existing electro-hydraulic actuator, the lower end of the oil tank air outlet pipe is connected to the oil tank, and the upper end is connected to the breather body. When the hydraulic cylinder is in motion, the air in the oil tank is exchanged with the outside air through the oil tank air outlet pipe and the breather body. Since the oil tank air outlet pipe is very short and is installed vertically upward, when the oil column sprayed from the exhaust hole on the oil return pipe in the oil tank hits the pipe or the inner wall of the oil tank, oil splashes instantly. The oil splashes into the breather and will be adsorbed on the filter cotton of the breather. When the oil adsorbed on the filter cotton reaches a saturated state, the oil on the filter cotton flows out under the action of gravity. In the long run, the outflowing oil not only pollutes the environment, but also causes the oil in the oil tank to be reduced or even completely emptied, resulting in oil shortage, damage to the oil pump, and inability of the electro-hydraulic actuator to operate normally, affecting production.

[0004] Chinese patent CN106762867A discloses a hydraulic oil tank respirator, including a lower exhalation device arranged at the inlet end of the upper exhalation device, and an oil filter net and a spiral separation part are arranged in the lower exhalation device, which can effectively adsorb the oil particles in the exhaust air on the oil filter net and the spiral separation part, reduce the concentration of oil particles reaching the upper exhalation device, and thus facilitate the cotton mesh filter element arranged in the upper exhalation device to completely absorb the oil particles, and avoid the oil particles from flowing out from the second air hole of the respirator to pollute the environment and affect the appearance of the hydraulic oil tank. Although the above patent schemes can prevent oil particles from flowing out from the second air hole of the respirator to pollute the environment and affect the appearance of the hydraulic oil tank. However, its structure is relatively complex, the manufacturing difficulty is relatively large, the manufacturing cost is high, and the cost expenditure of the enterprise is increased. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the oil column sprayed from the exhaust hole of the oil return pipe of the hydraulic oil tank of the existing electro-hydraulic actuator hits the inner wall of the oil tank or the pipeline, resulting in oil splashes flowing out of the breather, polluting the environment and reducing the oil, affecting the normal operation of the electro-hydraulic actuator; to provide a hydraulic oil tank breather for an electro-hydraulic actuator with a simple structure and low manufacturing cost.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: a hydraulic oil tank breather of an electro-hydraulic actuator, comprising a breather body, a joint, a first 90-degree elbow, a second 90-degree elbow and a straight pipe, wherein the lower end of the joint is connected to the oil tank outlet pipe, and the upper end is connected to the first 90-degree elbow; one end of the second 90-degree elbow is connected to the first 90-degree elbow, and the other end is open upward and connected to the lower end of the straight pipe, and the upper end of the straight pipe is connected to the breather body.

[0007] Furthermore, the central axis of the straight pipe is parallel to the central axis of the oil tank air outlet pipe.

[0008] Furthermore, the respirator body includes a shell, an inner partition, filter cotton and a bottom plate. The inner partition is connected to the shell and forms a breathing chamber with the shell. The inner partition is provided with a first air hole and a second air hole connected to the breathing chamber. Filter cotton is also provided on the inner partition and located on one side of the first air hole. The bottom plate and the inner partition are threadedly connected to the upper part of the straight pipe in sequence, and the inner partition and the bottom plate are sealed by a first gasket and a second gasket; a gas exchange hole is opened on the bottom plate.

[0009] The beneficial effects of the present invention are: simple structure, easy to manufacture and install, low cost, and maintenance-free. When used, it can effectively prevent the oil column sprayed from the exhaust hole of the oil return pipe from hitting the inner wall of the oil tank or the pipeline to splash onto the respirator, prevent the oil from flowing out of the respirator, avoid the problem of oil pump damage caused by the reduction of the oil level in the oil tank, and ensure the normal operation of the electro-hydraulic actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the present invention.

[0011] Figure 2 A schematic structural diagram of the respirator body of the present invention.

[0012] In the figure: 1. Respirator body; 2. Connector; 3. First 90-degree elbow; 4. Second 90-degree elbow; 5. Straight pipe; 6. Oil tank outlet pipe; 7. Oil tank; 101. Shell; 102. Inner partition; 103. Filter cotton; 104. Bottom plate; 105. Breathing chamber; 106. First air hole; 107. Second air hole; 108. First gasket; 109. Second gasket; 110. Gas exchange hole. DETAILED DESCRIPTION

[0013] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0014] like Figure 1 , 2As shown, a hydraulic oil tank breather of an electro-hydraulic actuator of the present invention comprises a breather body 1, a joint 2, a first 90-degree elbow 3, a second 90-degree elbow 4 and a straight pipe 5, wherein the lower end of the joint 2 is connected to the oil tank air outlet pipe 6, and the upper end is connected to the first 90-degree elbow 3; one end of the second 90-degree elbow 4 is connected to the first 90-degree elbow 3, and the other end is open upward and connected to the lower end of the straight pipe 5, and the upper end of the straight pipe 5 is connected to the breather body 1.

[0015] Preferably, the central axis of the straight pipe 5 is parallel to the central axis of the oil tank air outlet pipe 6. Ensure that the straight pipe is vertically upward after installation.

[0016] like Figure 2 As shown, the respirator body 1 includes a shell 101, an inner partition 102, a filter cotton 103 and a bottom plate 104. The inner partition 102 is connected to the shell 101 and forms a breathing chamber 105 with the shell 101. The inner partition 102 is provided with a first air hole 106 and a second air hole 107 connected to the breathing chamber. The filter cotton 103 is provided on the inner partition 102 and located on one side of the first air hole 106. The bottom plate 104 and the inner partition 102 are threadedly connected to the upper part of the straight tube 5 in sequence, and the inner partition 102 and the bottom plate 104 are sealed by a first gasket 108 and a second gasket 109. The bottom plate 104 has a dust and water blocking function while having a limiting function. A gas exchange hole 110 is also provided on the bottom plate 104. When the hydraulic cylinder is in operation, the air in the oil tank 7 flows out from the straight pipe, enters the breathing chamber 105 through the first air hole 106, and is then discharged through the second air hole 107 and the gas exchange hole 110; conversely, the air outside the shell enters the straight pipe 5 through the gas exchange hole 110, the second air hole 107, and the first air hole 106 in sequence, and finally enters the inner cavity of the oil tank 7.

[0017] When the hydraulic oil tank respirator using the electro-hydraulic actuator of the present invention is used, when the oil column sprayed from the exhaust hole of the oil return pipe hits the inner wall of the oil tank or the pipeline, the oil splashes generated by the oil splashes to the oil tank outlet pipe 6 and continues to move upward toward the respirator chamber 105, most of the oil splashes are blocked by the first 90-degree elbow 3 and cannot continue to move upward. The blocked oil splashes contact the inner wall of the first 90-degree elbow 3 and adhere to the inner wall surface of the elbow. Under the action of gravity, they slowly flow back into the oil tank along the inner wall of the elbow and the oil tank outlet pipe 6. A small part of the oil splashes that are not blocked by the first 90-degree elbow 3 or the oil splashes collide with the inner wall of the elbow when passing through the first 90-degree elbow, and when they splash out again, they are blocked again by the second 90-degree elbow 4 installed behind the first 90-degree elbow 3 and cannot continue to move upward. Similarly, under the action of gravity, they flow back into the oil tank 7 along the inner wall of the elbow and the oil tank outlet pipe 6.

[0018] The present invention has a simple structure and good anti-splashing effect, solves the problem of oil shortage in the oil tank caused by oil splashing out of the respirator, and ensures the normal operation of the electro-hydraulic actuator. Specifically, after the oil tank outlet pipe 6 is connected to the first 90-degree elbow 3, the second 90-degree elbow 4 and the straight pipe 5 in sequence, under the premise of double blocking of the two elbows, it is guaranteed to the maximum extent that the oil splashing will return to the oil tank along the outlet pipe under the action of gravity before reaching the upper port of the outlet pipe.

[0019] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic oil tank breather for an electro-hydraulic actuator, characterized in that: The invention comprises a respirator body (1), a joint (2), a first 90-degree elbow (3), a second 90-degree elbow (4) and a straight pipe (5), wherein the lower end of the joint (2) is connected to the oil tank air outlet pipe (6), and the upper end is connected to the first 90-degree elbow (3); one end of the second 90-degree elbow (4) is connected to the first 90-degree elbow (3), and the other end is open upward and connected to the lower end of the straight pipe (5); the upper end of the straight pipe (5) is connected to the respirator body (1).

2. The hydraulic oil tank breather of the electro-hydraulic actuator according to claim 1, characterized in that: The central axis of the straight pipe (5) is parallel to the central axis of the oil tank air outlet pipe (6).

3. The hydraulic oil tank breather of the electro-hydraulic actuator according to claim 1 or 2, characterized in that: The respirator body (1) comprises a shell (101), an inner partition (102), filter cotton (103) and a bottom plate (104); the inner partition (102) is connected to the shell (101) and forms a breathing chamber (105) with the shell (101); the inner partition (102) is provided with a first air hole (106) and a second air hole (107) communicating with the breathing chamber; the filter cotton (103) is further provided on the inner partition (102) and located on one side of the first air hole (106); the bottom plate (104) and the inner partition (102) are threadedly connected to the upper part of the straight tube (5) in sequence; the inner partition (102) and the bottom plate (104) are sealed by a first gasket (108) and a second gasket (109); and a gas exchange hole (110) is opened on the bottom plate.

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