Ventilation plug for oil tank of hydraulic power unit

Abstract

The utility model discloses a ventilation plug for an oil tank of a hydraulic power unit, which comprises a plug body, a plug plug arranged in the lower end of the plug body, a plug cover rotatably arranged at the upper end of the plug body, a rubber ring abutted between the lower end of the plug body and the plug plug, an accommodating space formed between the plug body and the plug cover, and a spring arranged in the accommodating space. The spring always tends to enable the plug body to abut against the rubber ring, an exhaust port and an oil guide pipe are arranged on the plug cover, the oil guide pipe is connected with the exhaust port, the lower end of the plug cover extends into the plug body to be connected with the plug, an exhaust channel communicated with the exhaust port is arranged in the plug cover, the interior of the plug is hollow to form a fluid channel, and the upper end of the plug is sleeved with a rubber valve. An opening gap is formed in the rubber valve, the fluid channel is communicated with the exhaust channel through the rubber valve, an oil-gas mixture can be guided by the oil guide pipe to a designated position to be exhausted when being exhausted, the illusion of oil leakage is avoided, the oil guide pipe cannot rotate along with the oil tank in the process that the ventilation plug and the oil tank are screwed tightly, and installation of the oil guide pipe is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of ventilation plugs, in particular to a ventilation plug for an oil tank of a hydraulic power unit. Background Art

[0002] Hydraulic power units play a vital role in mechanical operation. The stability and reliability of their performance have a decisive impact on the overall equipment efficiency and safety. Hydraulic power units are widely used in various machines and equipment. Their core function is to transmit energy through liquid to achieve various actions and operations. Among them, the oil tank is a container for storing hydraulic oil, and the vent plug in the oil tank is one of the key components to ensure the normal operation of the hydraulic system.

[0003] In the hydraulic power unit, the venting plug is a key component. Its main function is to adjust the pressure inside the oil tank to prevent damage to the system due to excessive or low pressure, and to ensure that the remaining oil in the oil tank will not leak out during transportation, so as to avoid contaminating the packaging box. When the hydraulic oil returns to the oil tank from the actuator, some air may be brought into the oil tank due to the movement of the actuator. If this part of the air cannot be discharged in time, the pressure inside the oil tank will increase, thus affecting the normal operation of the hydraulic system. The traditional venting plug design is relatively simple. When the hydraulic oil returns to the oil tank from the actuator, the air in it is discharged through the venting plug. However, in this process, after the air and oil droplets are mixed, it is easy to form fine oil mist, which may flow to the surface of the assembly, forming the so-called "false oil leakage". In fact, this "false oil leakage" is not a real oil leakage, but it will make users mistakenly think that there is an oil leakage failure in the hydraulic system, which will cause unnecessary concerns and maintenance work, so it is necessary to improve it. Utility Model Content

[0004] The purpose of the utility model is to provide a ventilation plug for the oil tank of a hydraulic power unit in view of the defects and shortcomings of the prior art, which has a simple and reasonable structure and is easy to operate. The oil-gas mixture can be guided to a designated position by an oil guide pipe for discharge during discharge, thereby avoiding the illusion of oil leakage. When the ventilation plug is tightened with the oil tank, the oil guide pipe will not rotate with it, thereby facilitating the installation of the oil guide pipe.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model describes a ventilation plug for an oil tank of a hydraulic power unit, comprising a plug body, a plug plug is provided in the lower end of the plug body, a plug cover is rotatably provided at the upper end of the plug body, a rubber ring is abutted between the lower end of the plug body and the plug, an accommodating space is formed between the plug body and the plug cover, a spring is provided in the accommodating space, the spring always has the tendency to make the plug body and the rubber ring abut against each other, an exhaust port and an oil guide pipe are provided on the plug cover, the oil guide pipe is connected to the exhaust port, the lower end of the plug cover extends into the plug body and is connected to the plug plug, an exhaust channel connected to the exhaust port is provided in the plug cover, a fluid channel is formed in the internal hollow of the plug plug, a rubber valve is provided on the upper end of the plug plug, an opening gap is provided on the rubber valve, and the fluid channel is connected to the exhaust channel through the rubber valve.

[0007] Furthermore, a limiting step is provided in the lower end of the plug body, the plug is limitedly matched with the limiting step, and a rubber ring is provided between the plug and the limiting step.

[0008] Furthermore, the upper end surface of the rubber ring is in sealing cooperation with the plug body, and the lower end surface of the rubber ring is in sealing cooperation with the plug.

[0009] Furthermore, an annular groove is provided on the outer wall of the upper end of the plug, and an annular protrusion matching the annular groove is provided on the inner wall of the rubber valve.

[0010] Furthermore, a rubber portion is provided at the center of the rubber valve, and an opening gap is provided on the rubber portion. When the pressure in the fluid channel or the exhaust channel increases, the rubber portion expands under force to open the opening gap.

[0011] Furthermore, a surface of the film portion close to the plugging is a concave surface.

[0012] Furthermore, a thread for connecting with the oil tank is provided on the outer wall of the lower end of the plug body.

[0013] Furthermore, a sealing groove is provided on the outer wall of the plug body, and an O-ring is provided in the sealing groove.

[0014] Furthermore, a mounting groove is formed in the upper end of the plug body, and the mounting groove cooperates with the plug cover to form the accommodating space.

[0015] Furthermore, the upper end of the spring abuts against the plug cover, and the lower end of the spring abuts against the bottom of the installation slot.

[0016] The beneficial effects of the utility model are as follows: the utility model describes a ventilation plug for an oil tank of a hydraulic power unit, the plug cover can rotate relative to the plug body, the plug cover is provided with an exhaust port and an oil guide pipe, the oil guide pipe is connected to the exhaust port, this design enables the oil-gas mixture to be guided to a designated position by the oil guide pipe for discharge during discharge, thereby avoiding the illusion of oil leakage, when the ventilation plug is tightened with the oil tank, the plug body rotates, the plug cover and the plug remain stationary, ensuring that the oil guide pipe does not rotate with it, thereby facilitating the installation of the oil guide pipe, the spring provides a pre-tightening force, so that the rubber ring is always in sealing cooperation with the plug body and the plug to prevent oil overflow.

[0017] The center of the rubber valve is provided with a film part, and an opening slit is provided on the film part. After the injection molding of the rubber valve is completed, the opening slit is cut out on the film part by simple blade cutting, which is convenient to manufacture and low in cost. When the pressure in the fluid channel or the exhaust channel increases, the film part is forced to expand, and the originally narrow opening slit is opened, so that the fluid channel and the exhaust channel are connected. When the pressure in the oil tank reaches a certain level, the film part bulges upward, opens the opening slit, and the oil-gas mixture is discharged from the oil guide pipe through the opening slit. Conversely, when the oil tank absorbs oil, the film part is subjected to downward pressure under the action of the oil pressure, and the film part is concave downward, and the opening slit is also opened, and the oil enters the oil tank through the opening slit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model;

[0019] Figure 2 yes Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0020] Figure 3 This is a schematic diagram of the overall structure of the utility model when it is not connected to the oil guide pipe;

[0021] Figure 4 It is a schematic diagram of the exploded structure of the utility model when it is not connected with the oil guide pipe;

[0022] Figure 5 It is a structural schematic diagram of the rubber valve in the utility model.

[0023] Figure 1-5 In: 1. Plug body; 2. Plug; 3. Plug cover; 4. Rubber ring; 5. Accommodation space; 6. Spring; 7. Exhaust port; 8. Oil guide pipe; 9. Exhaust channel; 10. Fluid channel; 11. Rubber valve; 12. Opening gap; 13. Limiting step; 14. Ring groove; 15. Annular protrusion; 16. Rubber part; 17. Thread; 18. Sealing groove; 19. O-ring; 20. Installation groove. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings.

[0025] like Figure 1-5 The oil tank ventilation plug of a hydraulic power unit shown in the figure comprises a plug body 1, a plug plug 2 is provided in the lower end of the plug body 1, a plug cover 3 is rotatably provided at the upper end of the plug body 1, a rubber ring 4 is abutted between the lower end of the plug body 1 and the plug plug 2, so as to improve the sealing performance and effectively prevent the oil from shaking out during transportation, and an accommodating space 5 is formed between the plug body 1 and the plug cover 3. Preferably, in this embodiment, a mounting groove 20 is formed in the upper end of the plug body 1, and the mounting groove 20 cooperates with the plug cover 3 to form the accommodating space 5, and a spring 6 is provided in the accommodating space 5, the upper end of the spring 6 abuts against the plug cover 3, and the lower end of the spring 6 abuts against the bottom of the mounting groove 20, and the spring 6 always has There is a tendency for the plug body 1 to abut against the rubber ring 4, thereby ensuring the sealing performance of the oil tank. An exhaust port 7 and an oil guide pipe 8 are provided on the plug cover 3, and the oil guide pipe 8 is connected to the exhaust port 7. This design allows the oil-gas mixture to be guided to a designated position by the oil guide pipe 8 for discharge during discharge, thereby avoiding the illusion of oil leakage. The lower end of the plug cover 3 extends into the plug body 1 and is connected to the plug 2, thereby enhancing the stability of the structure. An exhaust channel 9 connected to the exhaust port 7 is provided in the plug cover 3, and a fluid channel 10 is formed in the hollow interior of the plug 2. A rubber valve 11 is provided on the upper end of the plug 2, and an opening gap 12 is provided on the rubber valve 11. The fluid channel 10 is connected to the exhaust channel 9 through the rubber valve 11.

[0026] Preferably, in this embodiment, refer to Figure 5 , a rubber portion 16 is provided at the center of the rubber valve 11, and an opening slit 12 is provided on the rubber portion 16. Specifically, after the injection molding of the rubber valve 11 is completed, the opening slit 12 is cut out on the rubber portion 16 by simple blade cutting, which is convenient to manufacture and low in cost. When the pressure in the fluid channel 10 or the exhaust channel 9 increases, the rubber portion 16 is forced to expand, and the originally narrow opening slit 12 is opened, so that the fluid channel 10 is connected with the exhaust channel 9. Specifically, when the pressure in the oil tank reaches a certain level, the rubber portion 16 bulges upward, opens the opening slit 12, and the oil-gas mixture is discharged from the oil guide pipe 8 through the opening slit 12. On the contrary, when the oil tank absorbs oil, the rubber portion 16 is subjected to downward pressure under the action of the oil pressure, and the rubber portion 16 is concave downward, and the opening slit 12 is also opened, and the oil enters the oil tank through the opening slit 12.

[0027] Preferably, in this embodiment, refer to Figure 2 The side of the rubber portion 16 close to the plug 2 is a concave surface, so that the rubber portion 16 can be close to the plug 2, thereby improving the sealing performance of the rubber valve 11 and being able to bear the force more evenly when under pressure.

[0028] Preferably, in this embodiment, refer to Figure 3The outer wall of the lower end of the plug body 1 is provided with a thread 17 that is connected with the oil tank. Specifically, the plug cover 3 is fixed with the plug plug 2 by glue, and a gap is formed between the plug body 1 and the plug cover 3 and the plug plug 2. When the ventilation plug is tightened with the oil tank, the plug body 1 rotates, and the plug cover 3 and the plug plug 2 remain stationary, ensuring that the oil guide pipe 8 will not rotate with it, which is convenient for the installation of the oil guide pipe 8. The spring 6 provides a pre-tightening force, so that the rubber ring 4 is always sealed with the plug body 1 and the plug plug 2 to prevent oil from overflowing.

[0029] Specifically, one end of the oil guide pipe 8 is connected to the exhaust port 7, and the other end of the oil guide pipe 8 is fixed to the pump body of the oil pump. When it is suspended for refueling, it can play a role similar to an anti-lost rope.

[0030] Preferably, in this embodiment, a limiting step 13 is provided in the lower end of the plug body 1, and the plug 2 is limitedly matched with the limiting step 13, and a rubber ring 4 is arranged between the plug 2 and the limiting step 13 to ensure that the plug 2 can be firmly installed in the plug body 1 and is not easy to loosen or fall off. The rubber ring 4 can make the connection between the plug 2 and the plug body 1 tighter. Preferably, in this embodiment, the upper end face of the rubber ring 4 is sealed with the plug body 1, and the lower end face of the rubber ring 4 is sealed with the plug 2, which effectively prevents the leakage of liquid or gas.

[0031] Preferably, in this embodiment, an annular groove 14 is provided on the upper outer wall of the plug 2, and an annular protrusion 15 matching the annular groove 14 is provided on the inner wall of the rubber valve 11, so that the connection between the rubber valve 11 and the plug 2 is more stable and not easy to be separated.

[0032] Preferably, in this embodiment, a sealing groove 18 is provided on the outer wall of the plug body 1, and an O-ring 19 is provided in the sealing groove 18. When the plug body 1 is connected to the oil tank, the O-ring 19 can effectively perform a sealing function to prevent oil from overflowing.

[0033] The above description is only a preferred embodiment of the present utility model, so all equivalent changes or modifications made according to the structure, features and principles described in the scope of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A venting plug for an oil tank of a hydraulic power unit, comprising a plug body (1), wherein a plug (2) is provided at the lower end of the plug body (1), and characterized in that: A plug cover (3) is rotatably provided at the upper end of the plug body (1), a rubber ring (4) is provided between the lower end of the plug body (1) and the plug (2), an accommodating space (5) is formed between the plug body (1) and the plug cover (3), a spring (6) is provided in the accommodating space (5), the spring (6) always has a tendency to make the plug body (1) and the rubber ring (4) abut against each other, an exhaust port (7) and an oil guide pipe (8) are provided on the plug cover (3), the oil guide pipe (8) is connected to the exhaust port (7), the lower end of the plug cover (3) extends into the plug body (1) and is connected to the plug (2), an exhaust channel (9) communicating with the exhaust port (7) is provided in the plug cover (3), a fluid channel (10) is formed in the hollow interior of the plug (2), a rubber valve (11) is sleeved on the upper end of the plug (2), an opening slit (12) is provided on the rubber valve (11), and the fluid channel (10) is connected to the exhaust channel (9) through the rubber valve (11).

2. The venting plug for the oil tank of the hydraulic power unit according to claim 1, characterized in that: A limiting step (13) is provided in the lower end of the plug body (1), the plug (2) and the limiting step (13) are limitedly matched, and a rubber ring (4) is provided between the plug (2) and the limiting step (13).

3. The venting plug for the oil tank of the hydraulic power unit according to claim 2, characterized in that: The upper end surface of the rubber ring (4) is in sealing cooperation with the plug body (1), and the lower end surface of the rubber ring (4) is in sealing cooperation with the plug (2).

4. The venting plug for the oil tank of the hydraulic power unit according to claim 1, characterized in that: An annular groove (14) is provided on the outer wall of the upper end of the plug (2), and an annular protrusion (15) matching the annular groove (14) is provided on the inner wall of the rubber valve (11).

5. A venting plug for an oil tank of a hydraulic power unit according to claim 1 or 4, characterized in that: A rubber portion (16) is provided at the center of the rubber valve (11), and an opening slit (12) is provided on the rubber portion (16). When the pressure in the fluid channel (10) or the exhaust channel (9) increases, the rubber portion (16) is expanded by force, thereby opening the opening slit (12).

6. The venting plug for the oil tank of the hydraulic power unit according to claim 5, characterized in that: A surface of the film portion (16) close to the plug (2) is a concave surface.

7. The venting plug for the oil tank of the hydraulic power unit according to claim 1, characterized in that: A thread (17) for connecting with the oil tank is provided on the outer wall of the lower end of the plug body (1).

8. The venting plug for the oil tank of the hydraulic power unit according to claim 1, characterized in that: The outer wall of the plug body (1) is provided with a sealing groove (18), and an O-ring (19) is provided in the sealing groove (18).

9. The venting plug for the oil tank of the hydraulic power unit according to claim 1, characterized in that: An installation groove (20) is formed in the upper end of the plug body (1), and the installation groove (20) cooperates with the plug cover (3) to form the accommodating space (5).

10. The venting plug for the oil tank of the hydraulic power unit according to claim 9, characterized in that: The upper end of the spring (6) abuts against the plug cover (3), and the lower end of the spring (6) abuts against the bottom of the installation groove (20).

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