Novel oil pump with zero initial displacement

Abstract

The utility model belongs to the technical field of oil pumps, and particularly relates to a novel oil pump with zero initial displacement, which comprises an oil pump body with an oil inlet pipe and an oil outlet pipe, the oil outlet pipe is sequentially communicated with a buffer tank and a first electromagnetic valve, and a backflow pipe for backflow is communicated between the bottom of the buffer tank and the oil inlet pipe. A second electromagnetic valve is arranged on the backflow pipe, a buffering mechanism for buffering media is further arranged in the buffering tank and comprises a plug, a spring and a piston, the plug, the spring and the piston are sequentially installed in the top of the buffering tank from top to bottom, the plug is connected to the buffering tank in a threaded mode, and the spring is connected to the piston in a threaded mode. The oil pump body, the buffer tank and the return pipe which are additionally arranged are matched with the matched pipelines, so that the displacement range is adjusted to be 0-117ml / r, the speed of a product needing to be extruded at a low speed can be accurately controlled, and the problem of cracking of the product is effectively solved.

Description

Technical Field

[0001] This utility model belongs to the field of oil pump technology, specifically relating to a novel oil pump with zero initial displacement. Background Technology

[0002] When producing aluminum alloy profiles, the oil pump causes cracking in the products. The extrusion process of aluminum alloy products is highly sensitive to extrusion speed; excessive speed poses a risk of cracking. The press speed is controlled by current regulation, which sends a signal to the solenoid valve via an adjustable potentiometer. This signal then controls the oil pump flow rate through the variable pump deflection angle. A higher flow rate results in a larger displacement and faster speed. The current oil pump model is A7V160EL, with a maximum displacement of 160 ml / r. However, this pump has a drawback: even when the potentiometer is set to 0, the initial displacement is only 32 ml / r. This specification does not meet the speed control requirements of the aluminum alloy extrusion process. Utility Model Content

[0003] The purpose of this invention is to provide a novel oil pump with zero initial displacement to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a novel oil pump with zero initial displacement, comprising: an oil pump body with an inlet pipe and an outlet pipe, wherein a buffer tank and a first solenoid valve are sequentially connected to the outlet pipe, and a return pipe for backflow is connected between the bottom of the buffer tank and the inlet pipe, and a second solenoid valve is provided on the return pipe.

[0005] Preferably, the buffer tank is further provided with a buffering mechanism for buffering the medium. The buffering mechanism includes a plug, a spring and a piston. The plug, spring and piston are installed in sequence from top to bottom inside the top of the buffer tank. The plug is screwed onto the buffer tank. The return pipe and the oil outlet pipe are both located below the piston.

[0006] Preferably, the plug is further provided with a pressure sensor for detecting the pressure of the medium, and a pressing block is movably provided below the plug to abut against the pressure sensor, and the top end of the spring is mounted on the pressing block.

[0007] Preferably, the piston is further provided with a limiting post at the top to protect the spring, and the spring is sleeved on the limiting post. When the top end of the limiting post abuts against the pressing block, the compression of the spring is restricted.

[0008] Preferably, the buffer tank also has a partially transparent area on its exterior for viewing the state of the medium, and the transparent area is located in the longitudinal direction of the buffer tank.

[0009] Preferably, a first check valve for liquid guidance is provided between the first solenoid valve and the buffer tank, and a second check valve for liquid guidance is provided between the second solenoid valve and the buffer tank.

[0010] Preferably, a fixing mechanism is provided between the buffer tank and the oil pump body for fixing, the fixing mechanism being used to suspend the buffer tank on one side of the oil pump body.

[0011] Preferably, the fixing mechanism includes a first pipe clamp and a second pipe clamp respectively installed on the oil pump body and the buffer tank, and a connecting rod for connecting the first pipe clamp and the second pipe clamp is provided between them.

[0012] Compared with the prior art, this utility model has the following advantages:

[0013] (1) By adding an oil pump body, a buffer tank and a return pipe, and matching pipelines, this utility model can adjust the discharge range to 0-117ml / r, and can achieve accurate speed control for products that require low-speed extrusion, thereby effectively solving the problem of product cracking.

[0014] (2) The present invention has a buffer mechanism that can buffer the medium in the buffer tank, thereby avoiding excessive impact of the medium on the solenoid valve and improving the service life of the solenoid valve.

[0015] (3) This utility model uses an added pressure sensor to detect the oil pressure in the buffer tank and releases pressure through the return pipe and the second solenoid valve to avoid excessive oil pressure in the buffer tank. Attached Figure Description

[0016] Figure 1 This is a side view of the present invention;

[0017] Figure 2 This is a top view of the fixing mechanism of this utility model;

[0018] Figure 3 This is a cross-sectional view of the buffer tank, return oil pipe, and outlet oil pipe of this utility model;

[0019] In the diagram: 1. Oil pump body; 2. First pipe clamp; 3. Connecting rod; 4. Second pipe clamp; 5. Pressure sensor; 6. First check valve; 7. First solenoid valve; 8. Second check valve; 9. Second solenoid valve; 10. Transparent area; 11. Buffer tank; 12. Plug; 13. Oil outlet pipe; 14. Oil inlet pipe; 15. Return pipe; 16. Pressing block; 17. Spring; 18. Piston; 19. Limiting post. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] refer to Figure 2 As shown, the present invention provides a novel oil pump with zero initial displacement, comprising: an oil pump body 1 with an oil inlet pipe 14 and an oil outlet pipe 13, wherein a buffer tank 11 and a first solenoid valve 7 are sequentially connected to the oil outlet pipe 13, and a return pipe 15 for return flow is connected between the bottom of the buffer tank 11 and the oil inlet pipe 14, and a second solenoid valve 9 is provided on the return pipe 15.

[0022] As described above, when using the oil pump body 1, oil inlet pipe 14, oil outlet pipe 13, buffer tank 11, first solenoid valve 7 and second solenoid valve 9 provided by this utility model, when the oil pump body 1 is started, the external medium enters the equipment through the oil inlet pipe 14, and the medium is stored in the buffer tank 11 to keep the initial discharge rate at 0 ml / r. When there is too much oil in the buffer tank 11, it is circulated back to the oil inlet pipe 14 through the second solenoid valve 9 and the return pipe 15, and is pumped back into the oil pump body 1. The model and specification of the oil pump body is A7V117EL.

[0023] Furthermore, to facilitate monitoring the state of the medium in buffer tank 11, refer to... Figure 1 As shown, the buffer tank 11 also has a partially transparent area 10 on its exterior for viewing the medium's condition. The transparent area 10 is positioned along the longitudinal direction of the buffer tank 11. The height of the medium in the buffer tank 11 can be viewed through the transparent area 10.

[0024] Furthermore, to prevent the medium from flowing back into the return pipe 15 and the outlet pipe, as shown in the figure, a first check valve 6 for liquid guidance is provided between the first solenoid valve 7 and the buffer tank 11, and a second check valve 8 for liquid guidance is provided between the second solenoid valve 9 and the buffer tank 11. The first check valve 6 and the second check valve 8 prevent the medium in the oil outlet pipe 13 and the oil return pipe from flowing back into the buffer tank 11.

[0025] In this utility model, combined with Figure 3 As shown, the buffer tank 11 of this embodiment is also provided with a buffering mechanism for buffering the medium. The buffering mechanism includes a plug 12, a spring 17 and a piston 18. The plug 12, spring 17 and piston 18 are installed in the top of the buffer tank 11 from top to bottom. The plug 12 is screwed onto the buffer tank 11. The return pipe 15 and the oil outlet pipe 13 are both located below the piston 18.

[0026] Combination Figure 3 As shown, the plug 12 is also equipped with a pressure sensor 5 for detecting the pressure of the medium. A pressing block 16 is movably disposed below the plug 12 and abuts against the pressure sensor 5, and the top of the spring 17 is mounted on the pressing block 16.

[0027] As described above, in the buffer mechanism provided by this utility model, the spring 17 and piston 18 in the buffer mechanism are detachably installed in the buffer tank 11 through the plug 12. After removing the plug 12, the piston 18 and spring 17 can be inspected. When the medium enters the buffer tank 11 through the oil outlet pipe 13, it drives the piston 18 to rise. During the rising process, the spring 17 buffers the rising force, thereby pressing the pressure sensor 5 through the pressing block 16. At this time, the pressure sensor 5 detects the oil pressure. When the oil pressure is greater than the threshold, the first solenoid valve 7 and the second solenoid valve 9 cooperate with each other to discharge the medium in the buffer tank 11 to the outside, so as to avoid excessive oil pressure in the buffer tank 11.

[0028] Furthermore, in order to improve the service life of spring 17, refer to Figure 3 As shown, the piston 18 is also provided with a limiting post 19 at its top to protect the spring 17, and the spring 17 is sleeved on the limiting post 19. When the top of the limiting post 19 abuts against the pressing block 16, the compression of the spring 17 is restricted. When the piston 18 is pushed to a certain height, the limiting post 19 on the piston 18 abuts against the pressing block 16. At this time, the gap between the pressing block 16 and the piston 18 will no longer be compressed, thereby preventing the spring 17 from being over-pressed and thus improving the service life of the spring 17.

[0029] In this utility model, combined with Figure 1 and Figure 3 As shown, a fixing mechanism is also provided between the buffer tank 11 and the oil pump body 1 in this embodiment for fixing. The fixing mechanism is used to suspend the buffer tank 11 on one side of the oil pump body 1.

[0030] Combination Figure 3 As shown, the fixing mechanism includes a first pipe clamp 2 and a second pipe clamp 4 respectively installed on the oil pump body 1 and the buffer tank 11, and a connecting rod 3 for connecting is provided between the first pipe clamp 2 and the second pipe clamp 4.

[0031] As described above, using the fixing mechanism provided by this utility model, the two ends of the connecting rod 3 are detachably installed on the oil pump body 1 and the buffer tank 11 respectively through the first pipe clamp 2 and the second pipe clamp 4, thereby detachably installing the buffer tank 11 on one side of the oil pump body 1, so that the buffer tank 11 can be used in conjunction with the oil pump body 1.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel oil pump with zero initial displacement, characterized in that, include: The oil pump body (1) has an oil inlet pipe (14) and an oil outlet pipe (13). The oil outlet pipe (13) is connected in sequence to a buffer tank (11) and a first solenoid valve (7). The bottom of the buffer tank (11) is connected to the oil inlet pipe (14) by a return pipe (15) for return flow, and the return pipe (15) is provided with a second solenoid valve (9).

2. The novel oil pump with zero initial displacement according to claim 1, characterized in that: The buffer tank (11) is also provided with a buffering mechanism for buffering the medium. The buffering mechanism includes a plug (12), a spring (17) and a piston (18). The plug (12), spring (17) and piston (18) are installed in sequence from top to bottom inside the top of the buffer tank (11). The plug (12) is screwed onto the buffer tank (11). The return pipe (15) and the oil outlet pipe (13) are both located below the piston (18).

3. A novel oil pump with zero initial displacement according to claim 2, characterized in that: The plug (12) is also provided with a pressure sensor (5) for detecting the pressure of the medium. A pressing block (16) is movably provided below the plug (12) and abuts against the pressure sensor (5). The top of the spring (17) is installed on the pressing block (16).

4. A novel oil pump with zero initial displacement according to claim 3, characterized in that: The piston (18) is also provided with a limiting post (19) to protect the spring (17), and the spring (17) is sleeved on the limiting post (19). When the top of the limiting post (19) abuts against the pressing block (16), the compression of the spring (17) is restricted.

5. A novel oil pump with zero initial displacement according to claim 1, characterized in that: The buffer tank (11) is also provided with a partially transparent area (10) for viewing the state of the medium, and the transparent area (10) is located in the longitudinal direction of the buffer tank (11).

6. A novel oil pump with zero initial displacement according to claim 1, characterized in that: A first check valve (6) for liquid guidance is provided between the first solenoid valve (7) and the buffer tank (11), and a second check valve (8) for liquid guidance is provided between the second solenoid valve (9) and the buffer tank (11).

7. A novel oil pump with zero initial displacement according to claim 1, characterized in that: A fixing mechanism is also provided between the buffer tank (11) and the oil pump body (1) for fixing. The fixing mechanism is used to suspend the buffer tank (11) on one side of the oil pump body (1).

8. A novel oil pump with zero initial displacement according to claim 7, characterized in that: The fixing mechanism includes a first pipe clamp (2) and a second pipe clamp (4) respectively installed on the oil pump body (1) and the buffer tank (11), and a connecting rod (3) for connecting is provided between the first pipe clamp (2) and the second pipe clamp (4).

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