A super high-pressure electric pump

Abstract

The present invention discloses an ultra-high pressure electric pump, which comprises a protective frame. A fuel tank is arranged at the bottom of the protective frame. Above the fuel tank, there are an electric motor and an electric control system connected to the electric motor. Inside the fuel tank, there is a pump head connected to the electric motor. A plunger pair is arranged inside the pump head. Above the fuel tank, there is also an air cooler for cooling the hydraulic oil in the fuel tank. An integrated component is also arranged on the protective frame. The integrated component includes a valve block and a stop valve. One end of the valve block is connected to the plunger pair through a high-pressure oil pipe, and the other end is connected to the fuel tank through a return oil pipe. The stop valve is installed on the valve block. One end of the stop valve communicates with the fuel tank, and the other end communicates with the oil outlet interface of the electric pump. In the present invention, the pump head is closed and integrated at the output end of the electric motor, which is not only convenient for loading and unloading, has a stable structure, but also makes the pressure rise fluctuation smaller.

Description

Technical Field

[0001] The present invention relates to the technical field of special pumps for stretchers, and more specifically, to an ultra-high pressure electric pump. Background Art

[0002] During the construction process in some industrial fields that require the use of large equipment, hydraulic stretchers play a very convenient role in tightening and loosening large-sized bolts. The special pump for the stretcher is the power unit of the stretcher and the power source of the stretcher. The special pump for the stretcher belongs to a high-pressure pump, and the maximum working pressure can be as high as 150 Mpa. Each stretcher has higher and higher requirements for the flow output of the special pump for the stretcher, and at the same time, it requires the volume of the special pump for the stretcher to be smaller and smaller. Therefore, integration is the general trend of the special pump for the stretcher. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an ultra-high pressure electric pump, the pump head of which is enclosed and integrated at the output end of the motor, which is not only convenient for loading and unloading, has a stable structure, but also makes the pressure fluctuation smaller.

[0004] The technical solution adopted by the present invention is to provide an ultra-high pressure electric pump, which includes a protective frame. A fuel tank is provided at the bottom of the protective frame. An electric motor and an electric control system for controlling the operation of the electric motor are provided at the upper end of the fuel tank. A pump head connected to the electric motor is provided inside the fuel tank. A plunger pair is provided inside the pump head. An air cooler for cooling the hydraulic oil in the fuel tank is also provided above the fuel tank. An integrated component is also provided on the protective frame. The integrated component includes a valve block and a stop valve. One end of the valve block is connected to the plunger pair through a high-pressure oil pipe, and the other end is connected to the fuel tank through a return oil pipe. The stop valve is installed on the valve block. One end of the stop valve communicates with the fuel tank, and the other end communicates with the oil outlet interface of the electric pump.

[0005] After adopting the above structure, the present invention has the following advantages: The pump head is located below the output end of the electric motor and inside the fuel tank, so that the pump head is enclosed and installed, while improving the working stability of the electric motor and reducing noise. Different from the cantilever pump head in the prior art, the enclosed pump head not only has a fast pressure build-up, but also has a small fluctuation. The plunger pair is integrally installed inside the pump head, preventing the components connected to the pump head from loosening due to the vibration generated by the operation of the electric pump, and at the same time, it is convenient for loading, unloading and maintenance.

[0006] Preferably, the plunger pair includes a high-pressure plunger pair and a low-pressure plunger pair. The high-pressure plunger pair and the low-pressure plunger pair are arranged side by side. The overflow port of the low-pressure plunger pair is communicated with the oil tank through a cooler. The high-pressure plunger pair is supplied with oil by the low-pressure plunger pair. The oil outlets of the high-pressure plunger pair and the low-pressure plunger pair are communicated with the oil outlet interface of the electric pump. A low-pressure overflow valve is provided between the low-pressure plunger pump and the oil outlet interface of the electric pump. The low-pressure plunger pair and the high-pressure plunger pair realize the supply of low pressure to high pressure. In a conventional ultra-high pressure radial pump, the diameter of the high-pressure plunger is small, the stroke is short, and the rotational speed is high. It is not easy to discharge air when starting to suck oil, resulting in very difficult oil supply. Moreover, during the operation of the pump, the self-priming property is poor and the volumetric efficiency is also very low. Therefore, at the same rotational speed of the pump, in the present invention, the oil supply is easy and fast, greatly improving the oil supply efficiency, finally making the pressure more stable and consuming less energy.

[0007] Preferably, the pump head includes a base and a bearing seat fixed to the protection frame. The high-pressure plunger pair and the low-pressure plunger pair are located inside the base. The base is fixed to the bottom of the protection frame. The bearing seat is fixed to the bottom of the base and connected to the output shaft of the motor. The bearing seat fixes the output end of the motor, and the bearing seat is also fixed to the base. That is, the base and the bearing seat are sequentially fixed to the output end of the motor, making the shaft of the motor output end more stable.

[0008] Preferably, a high-pressure oil passage is opened in the valve block. One end of the high-pressure oil passage is communicated with the pump head through a high-pressure oil pipe, and the other end is communicated with the oil outlet interface of the electric pump. A first installation hole and a second installation hole communicated with the high-pressure oil passage are also opened in the valve block. The stop valve is communicated with the high-pressure oil passage through the first installation hole, and the low-pressure overflow valve is communicated with the high-pressure oil passage through the second installation hole, integrating the stop valve and the low-pressure overflow valve on the valve block, making it more convenient for loading and unloading.

[0009] Preferably, the stop valve includes a first valve body, a first valve seat, a first valve core, a first valve sleeve and a first pressure regulating rod. The first valve seat and the first valve body are sequentially inserted into the first installation hole. A first valve cavity is provided in the first valve body. The first valve sleeve is sleeved in the first valve cavity. The first valve core is located between the first valve body and the first valve seat. One end of the first valve core abuts against the first valve seat, and the other end abuts against the first valve sleeve. The first pressure regulating rod is sleeved in the first valve body and one end abuts against the first valve sleeve. The outer wall of the first pressure regulating rod is threadedly connected with the first valve body. Different from the straight push type pressure regulating rod in the prior art, the threaded connection makes the pushing more accurate and stable.

[0010] Preferably, the low-pressure overflow valve includes a second valve body, a second valve seat, a second valve core, a first spring seat and a second pressure regulating rod. The second valve seat and the second valve body are sequentially inserted into the base. A second valve cavity is provided in the second valve body. The second valve core and the first spring seat are sequentially sleeved in the second valve cavity. A spring is provided between the second valve core and the first spring seat. One end of the second valve core abuts against the second valve seat, and the other end abuts against the end of the spring. The second pressure regulating rod is sleeved in the second valve body and one end abuts against the first spring seat. Different from the reversing valve in the conventional technology, the overflow valve can limit the pressure constantly and will form a back oil resistance, which plays a certain cooling role on the oil fluid.

[0011] Preferably, a one-way oil outlet valve is provided between the high-pressure plunger pair and the base. The one-way oil outlet valve includes a third valve seat, a second spring seat, a one-way spring and a steel ball. The third valve seat is provided with a valve cavity. The second spring seat and the steel ball are located in the valve cavity. One end of the one-way spring abuts against the second spring seat, and the other end abuts against the steel ball. The second spring seat is provided with a circumferential through hole, and the circumferential through hole increases the oil fluid flow rate.

[0012] Preferably, the valve block is communicated with the pump head through a high-pressure oil pipe. The high-pressure oil pipe is connected to the pump head by a locking nut and a sleeve. The sleeve is sleeved on the high-pressure oil pipe. The locking nut is sleeved on the sleeve by an inverse thread connection method to prevent the nut from rotating and sliding back. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is the overall structural axonometric view of the present invention.

[0014] Figure 2 is the internal bottom view of the fuel tank of the present invention.

[0015] Figure 3 is the structural diagram of the plunger pair of the present invention.

[0016] Figure 4 is the structural diagram of the integrated component of the present invention.

[0017] Figure 5 is the cross-sectional view of the integrated component of the present invention.

[0018] Figure 6 is Figure 5 the cross-sectional view in the direction of A in

[0019] Figure 7 is the cross-sectional view of the low-pressure overflow valve of the present invention.

[0020] Figure 8 is Figure 7 the cross-sectional view in the direction of B in

[0021] Figure 9 is the cross-sectional view of the one-way oil outlet valve of the present invention.

[0022] Figure 10 It is the structural diagram of the second spring seat of the present invention.

[0023] Figure 11 It is the schematic diagram of the control system of the present invention.

[0024] Figure 12 It is the exploded view of the structure of the lock nut of the present invention.

[0025] Among them, 1. protective frame; 2. fuel tank; 3. motor; 4. electronic control system; 5. pump head; 6. high-pressure plunger pair; 7. low-pressure plunger pair; 8. air cooler; 9. valve block;

[0026] 10. stop valve; 10-1. first valve body; 10-2. first valve seat; 10-3. first valve core; 10-4. first valve sleeve; 10-5. first pressure regulating rod;

[0027] 11. high-pressure oil pipe; 12. return oil pipe; 13. oil outlet interface;

[0028] 14. low-pressure overflow valve; 14-1. second valve body; 14-2. second valve seat; 14-3. second valve core; 14-4. first spring seat; 14-5. second pressure regulating rod;

[0029] 15. high-pressure overflow valve; 16. base; 17. bearing seat; 18. high-pressure oil circuit; 19. first mounting hole; 20. second mounting hole;

[0030] 21. one-way oil outlet valve; 21-1. third valve seat; 21-2. second spring seat; 21-3. one-way spring; 21-4. steel ball; 21-5. circumferential through hole; 22. lock nut; 23. screw sleeve. Specific embodiments

[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0032] This embodiment provides an ultra-high pressure electric pump, as Figure 1 shown, it includes a protective frame 1, the protective frame 1 includes a bracket and a support plate, the bracket is fixed on the support plate, the bracket is used to protect each component on the support plate, the bottom of the support plate of the protective frame 1 is provided with a fuel tank 2, above the fuel tank 2, a motor 3 and an electronic control system 4 connected to the motor 3 are fixed, the output end of the motor 3 passes through the support plate and extends into the fuel tank 2, and a pump head 5 connected to the motor 3 is arranged inside the fuel tank 2, as Figure 2 shown, the pump head 5 includes a base 16 and a bearing seat 17 fixed to the protective frame 1, the output end of the motor 3 is fixed to the base 16 through the bearing seat 17, a bearing is also arranged between the output end of the motor 3 and the bearing seat 17, and the base 16 is fixed below the support plate, so that the pump head 5 is installed in a closed manner, and at the same time, the fuel tank 2 is similar to a protective cover to protect the pump head 5.

[0033] Above the fuel tank 2, there is also an air cooler 8 for cooling the hydraulic oil in the fuel tank 2. There is also an integrated component on the protective frame 1, such as Figure 4 shown. The integrated component includes a valve block 9 and a stop valve 10, as Figure 3 and 4 shown. The high-pressure plunger pair 6 and the low-pressure plunger pair 7 are both located in the base 16, and the high-pressure plunger pair 6 and the low-pressure plunger pair 7 are connected in series. The overflow port of the low-pressure plunger pair 7 is communicated with the fuel tank 2 through a cooler, and the oil outlet of the high-pressure plunger pair 6 is communicated with the oil outlet interface 13 of the electric pump. The base 16 is fixed to the bottom of the protective frame 1, and the bearing seat 17 is fixed to the bottom of the base 16 and connected to the shaft of the output end of the motor 3.

[0034] The inlet and outlet ports of the high-pressure plunger pair 6 and the low-pressure plunger pair 7 are both detachable. In this embodiment, as Figure 11 shown, the output pressure of the high-pressure plunger pair 6 is 150 Mpa, and the output pressure of the low-pressure plunger pair 7 is 10 Mpa.

[0035] One end of the valve block 9 is connected to the high-pressure plunger pair 6 through a high-pressure oil pipe 11, and the other end is connected to the fuel tank 2 through a return oil pipe 12. As Figure 5 and 6 shown, there is a plug-in stop valve 10 on the valve block 9. One end of the stop valve 10 is communicated with the fuel tank 2, and the other end is communicated with the oil outlet interface 13 of the electric pump. The stop valve 10 includes a first valve body 10-1, a first valve seat 10-2, a first valve core 10-3, a first valve sleeve 10-4 and a first pressure regulating rod 10-5. The first valve seat 10-2 and the first valve body 10-1 are sequentially and detachably inserted into the first mounting hole 19. There is a first valve cavity in the first valve body 10-1. The first valve sleeve 10-4 is sleeved in the first valve cavity. The first valve core 10-3 is located between the first valve body 10-1 and the first valve seat 10-2. One end of the first valve core 10-3 abuts against the first valve seat 10-2, and the other end abuts against the first valve sleeve 10-4. The first pressure regulating rod 10-5 is sleeved in the first valve body 10-1 and one end abuts against the first valve sleeve 10-4. The outer wall of the first pressure regulating rod 10-5 is threadedly connected to the first valve body 10-1.

[0036] The valve block 9, as the control component of the whole pump, mainly plays the role of fixing other components and distributing the flow direction of the hydraulic oil. The valve block 9 is made of alloy steel. There is a high-pressure oil circuit 18 in the valve block 9. One end of the high-pressure oil circuit 18 is communicated with the pump head 5 through a high-pressure oil pipe 11, and the other end is communicated with the oil outlet interface 13 of the electric pump. There are also a first mounting hole 19 and a second mounting hole 20 communicated with the high-pressure oil circuit 18 in the valve block 9. The stop valve 10 is communicated with the high-pressure oil circuit 18 through the first mounting hole 19, and the high-pressure overflow valve 15 is communicated with the high-pressure oil circuit 18 through the second mounting hole 20. The stop valve 10 and the high-pressure overflow valve 15 are detachably installed in the mounting holes for convenient plugging and unplugging.

[0037] As Figure 7 and 8 shown, the low-pressure overflow valve 14 includes a second valve body 14-1, a second valve seat 14-2, a second valve core 14-3, a first spring seat 14-4 and a second pressure regulating rod 14-5. The second valve seat 14-2 and the second valve body 14-1 are successively inserted onto the base. A second valve cavity is provided in the second valve body 14-1. The second valve core 14-3 and the first spring seat 14-4 are successively sleeved in the second valve cavity. A spring is provided between the second valve core 14-3 and the first spring seat 14-4. One end of the second valve core 14-3 abuts against the second valve seat 14-2, and the other end abuts against the end of the spring. The second pressure regulating rod 14-5 is sleeved in the second valve body 14-1 and one end thereof abuts against the first spring seat 14-4.

[0038] A one-way oil outlet valve 21 is provided between the high-pressure plunger pair 6 and the base 16. As Figure 9 shown, the one-way oil outlet valve 21 includes a third valve seat 21-1, a second spring seat 21-2, a one-way spring 21-3 and a steel ball 21-4. A valve cavity is provided in the third valve seat 21-1. The second spring seat 21-2 and the steel ball 21-4 are located in the valve cavity. One end of the one-way spring 21-3 abuts against the second spring seat 21-2, and the other end abuts against the steel ball 21-4. As Figure 10 shown, the second spring seat 21-2 is provided with a circumferential through hole 21-5.

[0039] A high-pressure overflow valve 15 is further provided between the high-pressure plunger pair 6 and the fuel tank 2. The output pressure is adjusted through the high-pressure overflow valve 15 according to the flow rate required by the electric pump. The structure of the high-pressure overflow valve 15 is the same as that of the low-pressure overflow valve 14 and will not be elaborated here.

[0040] The valve block 9 is communicated with the pump head 5 through a high-pressure oil pipe 11. As Figure 12 shown, the high-pressure oil pipe 11 is connected to the pump head 5 by means of a lock nut 22 and a bushing 23. Specifically, the bushing 23 is sleeved outside the high-pressure oil pipe 11, and the lock nut 22 is sleeved on the bushing 23. The bushing 23 and the lock nut 22 are connected by reverse-thread threads to prevent the lock nut 22 and the bushing 23 from loosening and detaching from the high-pressure oil pipe 11, and at the same time it is also convenient for the disassembly of the high-pressure oil pipe 11.

[0041] The above describes the preferred embodiments of the present invention, but it should not be construed as a limitation to the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to vary. All changes made within the protection scope of the independent claims of the present invention are within the protection scope of the present invention.

Claims

1. An ultra-high pressure electric pump, characterized in that, It includes a protective frame (1), at the bottom of the protective frame (1) there is an oil tank (2), at the upper end of the oil tank (2) there is a motor (3) and an electric control system (4) for controlling the operation of the motor (3), inside the oil tank (2) there is a pump head (5) connected to the motor (3), inside the pump head (5) there is a plunger pair, above the oil tank (2) there is also an air cooler (8) for cooling the hydraulic oil in the oil tank (2), on the protective frame (1) there is also an integrated component, the integrated component includes a valve block (9) and a stop valve (10), one end of the valve block (9) is connected to the plunger pair through a high-pressure oil pipe (11), and the other end is connected to the oil tank (2) through a return oil pipe (12), the stop valve (10) is installed on the valve block (9), one end of the stop valve (10) communicates with the oil tank (2), and the other end communicates with the oil outlet interface (13) of the electric pump; the plunger pair includes a high-pressure plunger pair (6) and a low-pressure plunger pair (7), the high-pressure plunger pair (6) and the low-pressure plunger pair (7) are arranged in parallel, the overflow port of the low-pressure plunger pair (7) communicates with the oil tank (2) through a cooler, the high-pressure plunger pair (6) is supplied with oil by the low-pressure plunger pair (7), the oil outlets of the high-pressure plunger pair (6) and the low-pressure plunger pair (7) communicate with the oil outlet interface (13) of the electric pump, and there is a low-pressure overflow valve (14) between the low-pressure plunger pair (7) and the oil outlet interface (13) of the electric pump; the pump head (5) includes a base (16) fixed to the protective frame (1) and a bearing block (17), the high-pressure plunger pair (6) and the low-pressure plunger pair (7) are located inside the base (16), the base (16) is fixed to the bottom of the protective frame (1), and the bearing block (17) is fixed to the bottom of the base (16) and connected to the output shaft of the motor (3); inside the valve block (9) there is a high-pressure oil circuit (18), one end of the high-pressure oil circuit (18) communicates with the pump head (5) through a high-pressure oil pipe (11), and the other end communicates with the oil outlet interface (13) of the electric pump, inside the valve block (9) there are also a first mounting hole (19) and a second mounting hole (20) communicating with the high-pressure oil circuit (18), the stop valve (10) communicates with the high-pressure oil circuit (18) through the first mounting hole (19), and the low-pressure overflow valve (14) communicates with the high-pressure oil circuit (18) through the second mounting hole (20);The globe valve (10) includes a first valve body (10-1), a first valve seat (10-2), a first valve core (10-3), a first valve sleeve (10-4) and a first pressure regulating rod (10-5). The first valve seat (10-2) and the first valve body (10-1) are sequentially inserted into a first mounting hole (19). A first valve chamber is provided in the first valve body (10-1). The first valve sleeve (10-4) is sleeved in the first valve chamber. The first valve core (10-3) is located between the first valve body (10-1) and the first valve seat (10-2). One end of the first valve core (10-3) abuts against the first valve seat (10-2), and the other end abuts against the first valve sleeve (10-4). The first pressure regulating rod (10-5) is sleeved in the first valve body (10-1) and one end thereof abuts against the first valve sleeve (10-4). The outer wall of the first pressure regulating rod (10-5) and the first valve body (10-1) are in threaded connection. A one-way oil outlet valve (21) is provided between the high-pressure plunger pair (6) and the base (16). The one-way oil outlet valve (21) includes a third valve seat (21-1), a second spring seat (21-2), a one-way spring (21-3) and a steel ball (21-4). A valve chamber is provided in the third valve seat (21-1). The second spring seat (21-2) and the steel ball (21-4) are located in the valve chamber. One end of the one-way spring (21-3) abuts against the second spring seat (21-2), and the other end abuts against the steel ball (21-4). A circumferential through hole (21-5) is formed in the second spring seat (21-2).; 2. The ultra-high pressure electric pump according to claim 1, characterized in that: The low-pressure overflow valve (14) includes a second valve body (14-1), a second valve seat (14-2), a second valve core (14-3), a first spring seat (14-4) and a second pressure regulating rod (14-5). The second valve seat (14-2) and the second valve body (14-1) are successively inserted into the base (16). A second valve cavity is provided in the second valve body (14-1). The second valve core (14-3) and the first spring seat (14-4) are successively sleeved in the second valve cavity. A spring is provided between the second valve core (14-3) and the first spring seat (14-4). One end of the second valve core (14-3) abuts against the second valve seat (14-2), and the other end abuts against the end of the spring. The second pressure regulating rod (14-5) is sleeved in the second valve body (14-1) and one end abuts against the first spring seat (14-4).

3. The ultra-high pressure electric pump according to claim 1, characterized in that: The valve block (9) is communicated with the pump head (5) through a high-pressure oil pipe (11). The high-pressure oil pipe (11) is connected to the pump head (5) by means of a lock nut (22) cooperating with a screw sleeve (23). The screw sleeve (23) is sleeved on the high-pressure oil pipe (11). The lock nut (22) is sleeved on the screw sleeve (23) by means of an anti-threaded connection.

Images