Exhaust prevention structure of hydraulic pump

Abstract

An exhaust prevention structure of a hydraulic pump comprises a sealing cylinder, a through hole is formed in the middle of the bottom of the sealing cylinder, a rotating shaft is rotatably installed in the through hole, a double-layer oil seal is detachably installed at the bottom end of the through hole and comprises an outer metal framework, an inner metal framework and an oil seal body, and the inner metal framework is fixedly installed in the oil seal body; a containing groove is formed in the top of the oil seal body, the outer metal framework comprises a supporting part and an extending part, a first sealing lip adheres to the end, close to the rotating shaft, of the sealing part, a second sealing lip is arranged on the side, close to the rotating shaft, of the oil seal body, a spring groove is formed in the side, close to the rotating shaft, of the containing groove, and a tightening spring is fixedly installed in the spring groove. Through the double-layer oil seal, the first sealing lip and the second sealing lip form an outer negative pressure cavity after the rotating shaft is installed, oil leakage is further prevented, the safety of the double-layer oil seal is greatly improved, and the service life of the double-layer oil seal is greatly prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic pumps, in particular to an anti-exhaust structure for a hydraulic pump. Background Technique

[0002] An oil seal is a commonly used sealing element. Oil seals are usually used for the sealing of lubricating oil. Oil seals can be used to seal mechanical components of grease. At the same time, oil seals can isolate the components that need to be lubricated in the transmission components from the output components, so as to prevent the leakage of lubricating oil. However, when an oil seal is in use, the same oil seal is not convenient to adapt to different working conditions. In a hydraulic pump, it is necessary to seal the shaft head of the hydraulic pump. The existing method usually uses a single skeleton for the oil seal, resulting in a risk of hydraulic oil leakage. Content of the Utility Model

[0003] The purpose of the utility model is to provide an anti-exhaust structure for a hydraulic pump to solve the problems existing in the above-mentioned prior art.

[0004] The above technical purpose of the utility model is achieved through the following technical solutions:

[0005] An anti-exhaust structure for a hydraulic pump, including a sealing cylinder, the axis of the sealing cylinder is vertically arranged, a through hole is arranged at the middle position of the bottom of the sealing cylinder, a rotating shaft is rotatably installed in the through hole, a double-layer oil seal is detachably installed at the bottom end of the through hole, the double-layer oil seal includes an outer metal skeleton, an inner metal skeleton and an oil seal body, the inner metal skeleton is fixedly installed inside the oil seal body, a receiving groove is arranged at the top of the oil seal body, the outer metal skeleton includes a support part and an extension part, the support part is arranged on one side of the receiving groove away from the rotating shaft, the top end of the support part extends towards the side of the receiving groove close to the rotating shaft to form a sealing part, a first sealing lip is bonded to one end of the sealing part close to the rotating shaft, a second sealing lip is arranged on one side of the oil seal body close to the rotating shaft, and a spring groove is arranged on one side of the receiving groove close to the rotating shaft, and a tightening spring is fixedly installed in the spring groove.

[0006] By adopting the above technical solutions, the inner metal skeleton and the outer metal skeleton of the double-layer oil seal can cooperate with each other. The first sealing lip on the outer metal skeleton can seal on the side where the oil seal is in direct contact with the hydraulic oil. The second sealing lip on the inner metal skeleton and the oil seal body can seal outside the first sealing lip. This design of double sealing lips, combined with the soft characteristics of the sealing lips themselves, can form a negative pressure cavity in the space between the two sealing lips after the rotating shaft is set, thereby preventing the leakage of oil. Even if the first sealing lip and the shaft are worn due to long-term friction, resulting in oil leakage, the second sealing lip can prevent the further leakage of oil.

[0007] In a further embodiment, a positioning convex ring is integrally formed on the outer side wall of the supporting portion, a limiting groove is provided on the side of the accommodating groove of the oil seal body away from the rotating shaft, and the outer metal skeleton is detachably connected to the oil seal body through a positioning block.

[0008] By adopting the above technical solution, the outer metal skeleton is detachably fixed by the cooperation of the positioning convex ring and the limiting groove. Since the position of the oil seal body is fixed and it is in contact with the inner wall of the through hole and the rotating shaft on both sides respectively, it can play a supporting role for the outer metal skeleton, making the disassembly and assembly of the two convenient. They can be repaired simultaneously or separated, and only the more easily worn outer metal skeleton and the first sealing lip can be replaced, reducing the loss of spare parts.

[0009] In a further embodiment, a dust-proof lip is provided at the bottom end of the inner side wall of the oil seal body, and a sealing strip is adhered to the side of the dust-proof lip close to the second sealing lip.

[0010] By adopting the above technical solution, the dust-proof lip can prevent fine particles such as dust from entering the hydraulic pump from the outside, which may cause harm to the operation of the hydraulic pump and even the entire hydraulic system.

[0011] In a further embodiment, an upper chamfer is provided at the outer edge of the top of the oil seal body, and a lower chamfer is provided at the outer edge of the bottom of the oil seal body.

[0012] By adopting the above technical solution, although the oil seal body is an elastomer, since it needs to be installed flatly in the hydraulic pump, chamfers are provided to assist in installation, effectively improving the flatness of the oil seal.

[0013] In a further embodiment, the cross-sections of the outer metal skeleton and the inner metal skeleton are both L-shaped.

[0014] By adopting the above technical solution, the L-shaped metal skeleton is more stable. The supporting portion therein can ensure the balance of the skeleton, while the sealing portion on the other side can make the sealing lip perpendicular to the metal skeleton.

[0015] In a further embodiment, a filling port is provided at the upper end of the side wall of the sealing cylinder. The filling port extends horizontally inward to form a filling cavity. One end of the filling cavity is communicated with the filling port, and the other end of the filling cavity is communicated with the through hole.

[0016] By adopting the above technical solution, the filling port is mainly for facilitating the maintenance of the oil seal body. Appropriate oil injection can keep the sealing lip flexible and elastic and generate an oil film between it and the rotating shaft, making it more difficult to be damaged.

[0017] In summary, the present utility model has the following beneficial effects:

[0018] 1. By setting up a double-layer oil seal, the cooperation of the inner and outer metal skeletons and the oil seal body can be utilized to achieve the design of double sealing lips. The soft characteristic of the sealing lips themselves can form a negative pressure cavity in the space between the two sealing lips after the rotating shaft is set, thereby achieving the effect of preventing oil leakage.

[0019] 2. By setting up a dust-proof lip, it can prevent fine particles such as dust from entering the hydraulic pump from the outside, causing harm to the operation of the hydraulic pump and even the entire hydraulic system, and achieving the effect of extending the service life of the hydraulic pump.

[0020] 3. By setting up a filling port and a filling cavity, the sealing lips can be properly filled with oil through the filling port to maintain flexibility and elasticity, and a layer of oil film can be generated between them and the rotating shaft, making them more difficult to damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 FIG. is a schematic diagram of the overall structure in a hydraulic pump anti-exhaust structure of the present utility model;

[0022] Figure 2 FIG. is a schematic diagram of the internal structure for showing the sealing cylinder in a hydraulic pump anti-exhaust structure of the present utility model;

[0023] Figure 3 FIG. is a schematic diagram of the internal structure for showing the double-layer oil seal in a hydraulic pump anti-exhaust structure of the present utility model.

[0024] In the figure, 1, sealing cylinder; 2, double-layer oil seal; 21, outer metal skeleton; 211, support part; 212, sealing part; 22, inner metal skeleton; 23, oil seal body; 3, first sealing lip; 4, second sealing lip; 5, tightening spring; 6, dust-proof lip; 7, filling port; 8, filling cavity. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following further describes the present utility model in detail with reference to the accompanying drawings.

[0026] Among them, the same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the attached Figure 1 drawings, and the terms "bottom surface" and "top surface", "inner" and "outer" respectively refer to the directions facing or away from the geometric center of a specific component. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this specification, "a plurality" means two or more unless otherwise specifically defined.

[0027] Embodiment:

[0028] As Figures 1 - 3 shown, a hydraulic pump anti-exhaust structure includes a sealed cylinder 1. The axis of the sealed cylinder 1 is vertically arranged. A through hole is provided at the middle position of the bottom of the sealed cylinder 1. A rotating shaft is rotatably installed in the through hole. A filling port 7 is provided at the upper end of the side wall of the sealed cylinder 1. The filling port 7 horizontally extends inward to form a filling cavity 8. One end of the filling cavity 8 is communicated with the filling port 7, and the other end of the filling cavity 8 is communicated with the through hole. A double-layer oil seal 2 is detachably installed at the bottom end of the through hole. The double-layer oil seal 2 includes an outer metal skeleton 21, an inner metal skeleton 22 and an oil seal body 23. The outer metal skeleton 21 includes a support portion 211 and an extension portion. A limiting groove is provided on the side of the accommodation groove of the oil seal body 23 away from the rotating shaft. The outer metal skeleton 21 is detachably connected to the oil seal body 23 through a positioning block. A support portion 211 is provided on the side of the accommodation groove away from the rotating shaft. The top end of the support portion 211 extends toward the side of the accommodation groove close to the rotating shaft to form a sealing portion 212. A first sealing lip 3 is bonded to one end of the sealing portion 212 close to the rotating shaft. A second sealing lip 4 is provided on the side of the oil seal body 23 close to the rotating shaft. And a spring groove is provided on the side of the accommodation groove close to the rotating shaft. A tightening spring 5 is fixedly installed in the spring groove. Through the filling port 7 and the filling cavity 8, the lubricating oil can lubricate and maintain the second sealing lip 4 from top to bottom. The lubricating oil will form an oil film between the second sealing lip 4 and the rotating shaft, thereby protecting the sealing lip itself from causing the oil fluid to fail due to wear. The design of the double sealing lips can enable the sealing lips and the rotating shaft to be fully squeezed during the installation of the rotating shaft, thereby forming a negative pressure cavity area, further preventing the oil fluid from leaking, and effectively improving the service life of the double-layer oil seal.

[0029] As Figures 1 - 3 shown, an upper chamfer is provided at the outer edge of the top of the oil seal body 23, a lower chamfer is provided at the outer edge of the bottom of the oil seal body 23, a dust-proof lip 6 is provided at the bottom end of the inner side wall of the oil seal body 23, and a sealing strip is bonded to the side of the dust-proof lip 6 close to the second sealing lip 4. The cross-sections of the outer metal skeleton 21 and the inner metal skeleton 22 are both L-shaped. The inner metal skeleton 22 is fixedly installed inside the oil seal body 23. A accommodation groove is provided at the top of the oil seal body 23. A positioning convex ring is integrally formed on the outer side wall of the support portion 211. Through the L-shaped skeleton structure, the inner metal skeleton 22 and the outer metal skeleton 21 can cooperate with each other better. The dust-proof lip 6 can prevent external dust from entering the inside of the hydraulic pump and affecting the safe operation of the overall hydraulic system. The sealing strip bonded to the side of the dust-proof lip 6 close to the second sealing lip 4 can assist the second sealing lip 4 to prevent the oil fluid from skewing, ensuring that the oil seal can maintain stable operation within the rated cycle and there will be no oil fluid leakage.

[0030] Specific implementation process: The inner metal skeleton 22 and the oil seal body 23 are integrally formed. A limiting groove is provided in the accommodating groove on the oil seal body 23, and the limiting groove cooperates with the positioning convex ring on the supporting portion 211 of the outer metal skeleton 21, so that the inner metal skeleton 22 and the outer metal skeleton 21 are relatively fixed and will not displace during the installation of the rotating shaft. Moreover, the first sealing lip 3 installed on the outer metal skeleton 21 and the second sealing lip 4 installed on the oil seal body 23 can also cooperate with each other. After the installation of the rotating shaft is completed, an external negative pressure cavity is formed to prevent oil leakage. The filling port 7 and the filling cavity 8 on the sealing cylinder 1 can inject lubricating fluid to form an anti-wear oil film between the second sealing lip 4 and the rotating shaft, further improving the service life of the second sealing lip 4.

[0031] In the embodiments disclosed in the present utility model, terms such as "installation", "connection", "coupling", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "coupling" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments disclosed in the present utility model can be understood according to specific circumstances.

[0032] This specific embodiment is only an explanation of the present utility model and does not limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present utility model, it is protected by the patent law.

Claims

1. A hydraulic pump anti-exhaust structure, including a sealed cylinder (1), characterized in that: The axis of the sealed cylinder (1) is vertically arranged. A through hole is provided at the middle position of the bottom of the sealed cylinder (1). A rotating shaft is rotatably installed in the through hole. A double-layer oil seal (2) is detachably installed at the bottom end of the through hole. The double-layer oil seal (2) includes an outer metal skeleton (21), an inner metal skeleton (22) and an oil seal body (23). The inner metal skeleton (22) is fixedly installed inside the oil seal body (23). A receiving groove is provided at the top of the oil seal body (23). The outer metal skeleton (21) includes a support portion (211) and an extension portion. The support portion (211) is provided at the side of the receiving groove away from the rotating shaft. The top end of the support portion (211) extends towards the side of the receiving groove close to the rotating shaft to form a sealing portion (212). A first sealing lip (3) is bonded to the end of the sealing portion (212) close to the rotating shaft. A second sealing lip (4) is provided on the side of the oil seal body (23) close to the rotating shaft. And a spring groove is provided on the side of the receiving groove close to the rotating shaft. A tightening spring (5) is fixedly installed in the spring groove.

2. The anti-exhaust structure of a hydraulic pump according to claim 1, characterized in that: A positioning convex ring is integrally formed on the outer side wall of the support portion (211). A limiting groove is provided on the side of the receiving groove of the oil seal body (23) away from the rotating shaft. The outer metal skeleton (21) is detachably connected to the oil seal body (23) through a positioning block.

3. The anti-exhaust structure of a hydraulic pump according to claim 2, wherein: A dust-proof lip (6) is provided at the bottom end of the inner side wall of the oil seal body (23). And a sealing strip is bonded to the side of the dust-proof lip (6) close to the second sealing lip (4).

4. A hydraulic pump anti-exhaust structure according to claim 3, characterized in that: An upper chamfer is provided at the outer edge of the top of the oil seal body (23). A lower chamfer is provided at the outer edge of the bottom of the oil seal body (23).

5. The anti-exhaust structure of a hydraulic pump according to claim 1, characterized in that: The cross-sections of both the outer metal skeleton (21) and the inner metal skeleton (22) are L-shaped.

6. The anti-exhaust structure of a hydraulic pump according to claim 1, characterized in that: A filling port (7) is provided at the upper end of the side wall of the sealed cylinder (1). The filling port (7) horizontally extends inwards to form a filling cavity (8). One end of the filling cavity (8) is communicated with the filling port (7). The other end of the filling cavity (8) is communicated with the through hole.

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