Oil inlet and return flange sealing structure of oil tank

Abstract

An oil tank oil inlet and return flange sealing structure comprises an oil inlet and return flange, an O-shaped ring and a flange face bolt, the oil inlet and return flange comprises an oil inlet steel pipe, an oil return steel pipe and a flange plate, two through holes are formed in the flange plate, one end of the oil inlet steel pipe and one end of the oil return steel pipe are communicated with an oil pipe, and the communication position is sealed. The other end of the oil inlet steel pipe and the other end of the oil return steel pipe respectively penetrate through one through hole and then reach the bottom close to the oil tank, the penetrating positions are welded, the flange plate is installed on the top of the oil tank through flange face bolts, a circle of groove is further formed in the bottom face of the flange plate, and an O-shaped ring is placed in the groove in a matched mode. An original screw and an original spring washer are changed into the bolt with the flange face, large torque can be applied, it is guaranteed that the sealing performance is still reliable enough under the severe working environment, the O-shaped ring structure is adopted, the sealing performance is more reliable, the influence of factors such as rubber rebound is avoided, and sealing is more reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of tractors, and particularly relates to a sealing structure for the inlet and return oil flanges of a fuel tank. Background Art

[0002] The existing inlet and return oil structures of tractor fuel tanks generally realize the inlet and outlet of oil by opening inlet and return oil ports on the fuel tank and then connecting them to the oil pipes in the oil circuit. Since the connection points often have poor airtightness and are prone to disengagement, oil leakage occurs, affecting normal operation.

[0003] There is a flange design in the market to solve the sealing problem of the inlet and return oil of the fuel tank. However, it is found that the flange mainly provides fuel supply for the engine by welding an oil pipe on it. The flange for inlet and return oil is fixed to the top of the fuel tank by screws and spring washers. This structure presses the rubber gasket under the flange plate against the fuel tank through the screws and spring washers. Its deficiencies are as follows: Since the original gasket is made of nitrile rubber and has poor rigidity, under harsh operating conditions, the spring washers and screws are prone to looseness, resulting in oil leakage; due to the existence of the rubber gasket in the original structure, the requirement for the tightening torque of the screws is relatively high, which is not conducive to market maintenance, and the screw slot is prone to slipping teeth; due to the flanging requirement of the original flange plate, it needs to be manufactured by die-casting, which is not conducive to subsequent modification. Therefore, it is necessary to develop a reasonable sealing structure for the inlet and return oil flanges of the fuel tank. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. For this reason, the purpose of the utility model is to provide a sealing structure for the inlet and return oil flanges of a fuel tank to solve the problems of poor airtightness when the inlet and return oil ports on the fuel tank are connected to the oil pipes and oil leakage caused by insufficient sealing performance when the existing flange structure is connected to the fuel tank.

[0005] The utility model is realized through the following technical solutions:

[0006] A sealing structure for the inlet and return oil flanges of a fuel tank includes: an inlet and return oil flange, an O-ring, and flange surface bolts. The inlet and return oil flange includes an oil inlet steel pipe, an oil return steel pipe, and a flange plate. Two through holes are opened on the flange plate. One end of the oil inlet steel pipe and the oil return steel pipe is connected to the oil pipe and sealed at the connection point. The other ends of the oil inlet steel pipe and the oil return steel pipe each pass through a through hole until they are close to the bottom of the fuel tank and are welded at the passing point. The section located inside the fuel tank is fixed to the inner wall of the fuel tank by a fixing plate. Installation holes are opened on the outer edge of the flange plate, which are arranged in cooperation with the hole positions on the fuel tank and are screwed in with flange surface bolts. A groove is also opened on the bottom surface of the flange plate, which is located between the installation hole and the adjacent through hole, and an O-ring is placed in it for cooperation.

[0007] Preferably, the oil pipe is a rubber hose and is sleeved on one end of the oil inlet steel pipe and the oil return steel pipe. At the sleeved joint, it is fastened with a hose clamp.

[0008] Preferably, at the connection of the oil inlet steel pipe and the oil return steel pipe with the corresponding oil pipe, a 24° taper seal structure is adopted.

[0009] Preferably, after the other end of the oil inlet steel pipe enters the fuel tank, the end is flush with the bottom of the fuel tank.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0011] 1. By changing the original screw and spring washer to a bolt with a flange surface in the present utility model, it is beneficial to apply a large torque, ensuring that the sealing performance is still reliable enough under harsh working conditions. The O-ring structure is adopted to make the sealing more reliable, without the influence of factors such as rubber rebound, and the sealing is more reliable;

[0012] 2. In the present utility model, the oil inlet and return ports on the surface of the original fuel tank are improved to the two ends of the corresponding oil inlet and return steel pipes through the oil inlet and return flanges, thus avoiding the defect of oil leakage often caused by poor airtightness and easy disengagement at the connection on the surface of the fuel tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0014] Figure 1 It is a schematic structural diagram of the oil inlet and return flange sealing structure of the fuel tank of the present utility model (only shown for oil return);

[0015] Figure 2 It is a schematic side view structure diagram of the oil inlet and return flange of the present utility model;

[0016] Figure 3 It is a schematic top view structure diagram of the oil inlet and return flange of the present utility model.

[0017] Among them, the oil inlet and return flange 1, the oil inlet steel pipe 101, the oil return steel pipe 102, the flange plate 103, the O-ring 2, the flange surface bolt 3, the oil pipe 4, the fuel tank 5, the hose clamp 6, the fixing plate 7, the mounting hole 8. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] To enable those skilled in the art to better understand the solution of this application, the following will clearly and completely describe the technical solution in the embodiments of this application in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0019] The technical solution of the present utility model will be further described below in conjunction with the accompanying drawings:

[0020] Figures 1-3 A fuel tank inlet and return oil flange sealing structure is shown, including: an inlet and return oil flange 1, an O-ring 2, and a flange surface bolt 3. The inlet and return oil flange 1 includes an oil inlet steel pipe 101, an oil return steel pipe 102, and a flange plate 103. Two through holes are provided in the middle of the flange plate 103. One end of the oil inlet steel pipe 101 and the oil return steel pipe 102 are respectively connected to the corresponding oil pipes 4 in the oil circuit and sealed at the connection. The other ends of the oil inlet steel pipe 101 and the oil return steel pipe 102 respectively pass through a through hole until they are close to the bottom of the fuel tank 5, and are welded at the through position. The section located inside the fuel tank 5 is fixed to the inner wall of the fuel tank 5 with a fixing plate 7. Installation holes 8 are provided on the outer edge of the flange plate 103, which are arranged in cooperation with the hole positions on the fuel tank 5. Generally, the hole positions are located on the top cover of the fuel tank 5, and the flange surface bolts 3 are screwed in to fix the flange plate 103 flatly on the fuel tank 5. Changing the original screws and spring washers to bolts with flange surfaces is beneficial for applying large torques and ensuring reliability in harsh working environments. In order to cancel the rubber gasket, a circular groove is also provided on the bottom surface of the flange plate 103, which is located between the installation holes 8 and the adjacent through holes, and the O-ring 2 is placed in cooperation. The O-ring structure is adopted to make the sealing performance more reliable. In order to be suitable for assembling the O-ring structure, the flange plate 103 is a flat disc type, which can be processed by an ordinary lathe without a mold, reducing the processing cost.

[0021] How to seal the connection between the oil inlet steel pipe 101 and the oil return steel pipe 102 and the oil pipe 4. As an embodiment of the present utility model, the connection between the oil inlet steel pipe 101 and the oil return steel pipe 102 and the corresponding oil pipe 4 in the oil circuit all adopt a 24° taper seal structure. For example, a 24° taper seal joint is used for connection and tightened with a nut. This 24° taper seal structure has good sealing effect and low failure rate, which is the prior art and will not be elaborated here.

[0022] The oil pipe 4 is generally a rubber hose because the rubber material is more durable, flexible, and has better connection sealing performance. As another embodiment of the present utility model, after each rubber hose in the oil circuit is sleeved on one end of the corresponding oil inlet steel pipe 101 and oil return steel pipe 102, a hose clamp 6 is used to fasten it at the sleeved position, and its sealing performance is good.

[0023] After the other end of the oil inlet steel pipe 101 enters the fuel tank, it extends for a section at the end and is arranged flush with the bottom of the fuel tank 5. Since the oil inlet of the oil inlet steel pipe 101 has reached the bottom of the fuel tank 5, sufficient oil is ensured in the oil circuit as much as possible.

[0024] The working principle of the present utility model is as follows: The oil in the fuel tank 5 flows out from the oil inlet steel pipe 101 into the oil pipe 4, and then returns to the fuel tank 5 through the oil circuit from the oil return steel pipe 102 connected to the oil pipe 4. There is no blind spot for oil leakage throughout the process. Since the connections between the oil inlet steel pipe 101 and the oil return steel pipe 102 and the corresponding oil pipes 4 in the oil circuit are all well-connected, and at the connection between the flange 103 and the fuel tank 5, complete sealing is achieved through the flange surface bolts 3 and the O-ring 2, thus ensuring smooth oil inlet and return in the oil circuit without oil leakage, and overcoming the problem of oil leakage caused by the influence of the sealing performance of the machine in a harsh working environment.

[0025] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A sealing structure for an oil tank inlet and return flange, characterized in that: include: The oil inlet and return flange (1), an O-ring (2), and flange bolts (3); the oil inlet and return flange (1) comprises an oil inlet steel pipe (101), an oil return steel pipe (102), and a flange plate (103); two through holes are provided in the middle of the flange plate (103); one end of the oil inlet steel pipe (101) and the oil return steel pipe (102) are respectively connected to the corresponding oil pipe (4) and sealed at the connection point; the other end of the oil inlet steel pipe (101) and the oil return steel pipe (102) are respectively passed through a After a through hole is formed until it reaches the bottom of the oil tank (5), it is welded at the through point. A section located inside the oil tank (5) is fixed to the inner wall of the oil tank (5) by a fixing plate (7). The outer edge of the flange (103) is provided with a mounting hole (8), which is arranged in coordination with the hole position on the oil tank (5) and is screwed in with a flange face bolt (3). A circle of grooves is also provided on the bottom surface of the flange (103), which is located between the mounting hole (8) and the adjacent through hole, and is adapted to accommodate an O-ring (2).

2. The oil tank oil inlet and return flange sealing structure according to claim 1 is characterized in that: The oil pipe (4) is a rubber hose and is sleeved on one end of the corresponding oil inlet steel pipe (101) and the oil return steel pipe (102). The sleeved joint is fastened with a throat clamp (6).

3. The oil tank oil inlet and return flange sealing structure according to claim 1 is characterized in that: The oil inlet steel pipe (101) and the oil return steel pipe (102) are connected to the corresponding oil pipe (4) using a 24° cone sealing structure.

4. The oil tank oil inlet and return flange sealing structure according to claim 1, characterized in that: After entering the oil tank, the other end of the oil inlet steel pipe (101) is extended at the end and is flushly arranged close to the bottom of the oil tank (5).

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