Electric oil pump

Abstract

An electric oil pump, comprising a base part (1), an oil pumping part (2), a power supply part (22), a power switch (23), a mechanical switch (5) and a pressure trigger part (3), wherein a flow channel (11) is formed inside the base part (1); the oil pumping part (2) is arranged on the base part (1) and can execute an oil pumping operation; the power switch (23) and the mechanical switch (5) are configured to determine whether the power supply part (22) supplies power to the oil pumping part (2); the pressure trigger part (3) is located between the mechanical switch (5) and the flow channel (11), and can press a press member (51) of the mechanical switch (5) when the pressure in the flow channel (11) is higher than an upper limit value, so as to cause the mechanical switch (5) to enter a non-conducting state from a conducting state; and the pressure trigger part (3) can also release the pressing on the press member (51) when the pressure in the flow channel (11) is lower than a lower limit value, so as to cause the mechanical switch (5) to return to the conducting state from the non-conducting state.

Description

Electric oil pump Technical Field

[0001] The present invention relates to a pump structure, and in particular to an electric oil well pump. Background Art

[0002] Oil used in agriculture or industry is usually packed in an oil barrel for transportation. When the oil is to be used, an electric oil pump is used to extract the oil from the oil barrel. The electric oil pump has an oil inlet and an oil outlet. The oil inlet is an opening fixed to the oil barrel and is connected to an oil extraction pipe that can be extended into the oil barrel. When the electric oil pump performs an oil extraction operation, the oil in the oil barrel flows to the oil outlet through the oil extraction pipe and flows out from an oil gun connected to the oil outlet. Existing electric pumps are required to start when a trigger of the oil gun is pressed, and conversely, when the trigger of the oil gun is released, the oil pump must stop operating immediately. However, existing electric pumps still need to be improved to meet the above requirements, save manufacturing costs and reduce failure rates.

[0003] Summary of the Invention

[0004] The present application discloses an electric oil pump, which includes a base that can be mounted on an oil barrel, an oil pumping unit arranged on the base, a power supply unit for supplying power to the oil pumping unit, a mechanical switch electrically connecting the oil pumping unit and the power supply unit, and a pressure trigger unit. The base has a flow channel, and the oil pumping unit can perform an oil pumping operation to allow the oil in the oil barrel to flow through the flow channel of the base. The mechanical switch has a pressing member, and when the pressing member is not pressed, the mechanical switch is in a non-conducting state, and when the pressing member is pressed, the mechanical switch is in a conducting state. The pressure trigger unit is located between the mechanical switch and the flow channel, and can press the pressing member when the pressure in the flow channel is greater than an upper limit value, and can release the pressing member when the pressure in the flow channel is lower than a lower limit value.

[0005] In one embodiment, the pressure triggering portion of the electric oil pump of the present application includes a receiving tube and a moving part. A channel and a chamber are formed in the interior of the receiving tube. A bottom end of the moving part is located in the chamber of the receiving tube, and a top end of the moving part extends out of the receiving tube through the channel and contacts the pressing part of the mechanical switch. The moving part is normally located in a non-triggering position where the pressing part is not pressed, and can be moved from the non-triggering position to a triggering position under the pressure of the flow channel, and press the pressing part at the triggering position.

[0006] In one embodiment, the pressure triggering portion of the electric oil pump of the present application includes a buffer mechanism disposed on the receiving tube, and the buffer mechanism is used to slow down the speed at which the moving member returns from the triggering position to the non-triggering position.

[0007] In one embodiment, the receiving tube of the electric oil pump of the present application also has a hole communicating with the channel, and the pressure triggering part also includes a spring and a steel ball located in the hole. The spring pushes the steel ball toward the movable part through its own elastic force and keeps the steel ball in a state of pressing against the movable part.

[0008] In one embodiment, an arcuate groove is further formed on the moving part of the pressure triggering portion of the electric oil pump of the present application, and the steel ball can slide into the arcuate groove.

[0009] In one embodiment, the electric oil pump of the present application includes a power switch and a safety switch. One end of the power supply unit is electrically connected to one end of a motor of the oil pumping unit, the other end of the motor is electrically connected to one end of the power switch, the other end of the power switch is electrically connected to one end of the mechanical switch, the other end of the mechanical switch is electrically connected to one end of the safety switch, and the other end of the safety switch is electrically connected to the other end of the power supply unit.

[0010] In one embodiment, the electric oil pump of the present application includes a power switch, one end of the power supply unit is electrically connected to one end of a motor of the oil pumping unit, the other end of the motor is electrically connected to one end of the power switch, the other end of the power switch is electrically connected to one end of the mechanical switch, and the other end of the mechanical switch is electrically connected to the other end of the power supply unit.

[0011] In one embodiment, the oil pumping part of the electric oil pump of the present application can be combined with the base and can also be removed from the base; wherein the mechanical switch is arranged on the base, the power switch and the safety switch are both arranged on the oil pumping part, and the base has two first electrical contacts exposed to the outside at a top opposite to the oil pumping part, and the two first electrical contacts are electrically connected to the two ends of the mechanical switch; the oil pumping part has two second electrical contacts exposed to the outside at a bottom opposite to the base, one of the second electrical contacts is electrically connected to the other end of the power switch, and the other second electrical contact is electrically connected to the end of the safety switch; when the oil pumping part is combined with the base, the two first electrical contacts of the base are electrically connected to the two second electrical contacts of the oil pumping part respectively; when the oil pumping part is detached from the base, the two first electrical contacts of the base are separated from the two second electrical contacts of the oil pumping part.

[0012] In one embodiment, the top of the base of the electric oil pump of the present application has a convex cover, the mechanical switch is located in the convex cover, and the two first electrical contacts are located on a top surface of the convex cover; the bottom of the oil pumping part has a receiving groove, and the two second electrical contacts are located in the receiving groove; when the oil pumping part is assembled on the base, the convex cover is wedged into the receiving groove.

[0013] In one embodiment, the oil pumping part of the electric oil pump of the present application includes an outer shell and an inner shell located inside the outer shell, the power switch is arranged on an outer wall surface of the inner shell, the motor is arranged inside the inner shell, and a top of the motor is exposed from the inner shell; wherein, the outer wall surface of the inner shell is formed with a plurality of wire fixing hooks, and the wires for electrically connecting the power supply part, the motor, the power switch, the mechanical switch and the safety switch are arranged along the outer wall surface of the inner shell, and the wire fixing hooks are used to hook the wires. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG1 shows a perspective view of an embodiment of an electric oil well pump of the present application;

[0015] FIG2 and FIG3 are schematic diagrams (partial cross-sections) showing the operation of the embodiment of the present application;

[0016] FIG4 shows a perspective exploded view of a pressure triggering portion 3 of the embodiment of the present application;

[0017] FIG5 shows a three-dimensional appearance diagram of the pressure triggering portion 3 of the embodiment of the present application;

[0018] FIG6 shows a schematic diagram of a control circuit for controlling a motor 21 in this embodiment of the present application;

[0019] FIG7 shows a perspective exploded view of the embodiment of the present application;

[0020] FIG8 shows a three-dimensional appearance diagram of a base 1 of the embodiment of the present application;

[0021] FIG9 shows a schematic bottom view of an oil pumping unit 2 according to the embodiment of the present invention;

[0022] FIG10 and FIG11 are schematic diagrams showing the operation of a locking mechanism 7 according to the embodiment of the present application;

[0023] FIG12 shows a three-dimensional appearance diagram of an inner shell 25 according to the embodiment of the present application;

[0024] FIG. 13 shows a three-dimensional appearance view of the inner shell 25 of the embodiment of the present application from another angle.

[0025] Explanation of Symbols: Base 1 Flow channel 11 Oil inlet 12 Oil extraction pipe 121 Oil outlet 13 Blade 14 Boss 17 First protrusion 18 Second protrusion 19 First slot 181 Second slot 191 First groove 201 Second groove 202 Oil extraction unit 2 Receiving groove 203 Motor 21 Transmission shaft 211 Rotating shaft 211b Engaging groove 211a Engaging block 212 Power supply unit 22 Power switch 23 External button 23a Internal button 23b Inner shell 25 Outer shell 26 Through hole 251 Wire fixing hook 252 Safety switch 27 Second electrical contact 28 Button 271 Pressure trigger unit 3 Receiving tube 31 Inner wall 31a Moving member 32 Channel 312 Channel 310 Opening 310a Receiving chamber 311 Lower opening 311a Upper stopper 321 Lower stopper 322, compression spring 33, elastic diaphragm 35, buffer mechanism 4, spring 41, steel ball 42, stopper 43, arc groove 323, mechanical switch 5, pressing member 51, first electrical contact 52, oil barrel 61, oil gun 62, trigger 621, oil outlet pipe 622, pipe joint 63Fastener 631 Internal channel 632 Connecting seat 64 Locking mechanism 7 Handle 71 Screw 72 Sliding seat 73 Front block 731 Rear block 732 Side protrusion 734 Ball plug 9 Hole 91 DETAILED DESCRIPTION

[0026] Figures 1 and 2 illustrate an embodiment of the electric oil pump of the present application. In this embodiment, the electric oil pump includes a base 1, an oil pumping unit 2, a power supply unit 22, a power switch 23, a pressure trigger unit 3, and a mechanical switch 5. The oil pumping unit 2 is disposed on the base 1 and is used to perform an oil pumping operation. In this embodiment, the base 1 and the oil pumping unit 2 are separable (described later), but the base 1 and the oil pumping unit 2 can also be integrated into one. The power supply unit 22 is used to supply the power required by the oil pumping unit 2. It can be a battery, such as a rechargeable battery, but is not limited to this. The power switch 23, the pressure trigger unit 3, and the mechanical switch 5 form an oil pumping control mechanism to determine whether the oil pumping unit 2 starts or stops the oil pumping operation. The oil pumping control mechanism preferably also includes a safety switch 27 (see Figure 10), which will be described later.

[0027] As shown in Figure 2, a flow channel 11 is formed inside the base 1. One end of the flow channel 11 is connected to an oil inlet 12 of a connecting seat 64, and the other end of the flow channel 11 is connected to an oil outlet 13 of the base 1. The oil outlet 13 is usually connected to one end of a pipe joint 63, and a fastener 631 is used to fasten the pipe joint 63 to prevent it from falling off. The other end of the pipe joint 63 is connected to an oil gun 62. The oil gun 62 is in communication with an internal channel 632 of the pipe joint 63. When the base 1 is mounted to an opening (not shown) of an oil barrel 61 through the connecting seat 64, the oil inlet 12 will be located inside the oil barrel 61, and the bottom end of an oil extraction pipe 121 screwed to the oil inlet 12 will be close to the bottom of the oil barrel 62.

[0028] The pumping unit 2 includes a motor 21, a transmission shaft 211, and a blade 14 (indicated by a dotted box in the figure). The motor 21 is connected to the top end of the transmission shaft 211, and the blade 14 is connected to the bottom end of the transmission shaft 211 and is located in the flow channel 11. The motor 21 can drive the transmission shaft 211 to rotate, and the rotation of the transmission shaft 211 can drive the blade 14 to rotate. In this embodiment, the top end of the transmission shaft 211 forms an engagement groove 211a (see Figure 7), and the bottom end of a rotating shaft 211b of the motor 21 is connected to an engagement block 212 (see Figure 9). The engagement block 212 can be inserted into the engagement groove 211a and engage therewith.

[0029] As shown in FIG2 , the mechanical switch 5 includes a pressing member 51. When the pressing member 51 is not pressed (see FIG2 ), the mechanical switch 5 is in a conducting state. When the pressing member 51 is pressed (see FIG3 ), the mechanical switch 5 immediately enters a non-conducting state.

[0030] The pressure triggering unit 3 is located between the mechanical switch 5 and the flow channel 11. When the pressure in the flow channel 11 exceeds an upper limit, the pressure member 51 is pressed, thereby causing the mechanical switch 5 to switch from the conductive state to the non-conductive state. The pressure triggering unit 3 can also release the pressure member 51 when the pressure in the flow channel 11 falls below a lower limit, thereby causing the mechanical switch 5 to switch from the non-conductive state to the conductive state.

[0031] In this embodiment, as shown in Figures 4 and 5, the pressure triggering portion 3 includes a receiving tube 31 and a moving member 32. A channel 310 and a chamber 311 that are in communication are formed inside the receiving tube 31. One end of the channel 310 forms an opening 310a that is directly opposite to the pressing member 51, and the other end of the channel 310 is in communication with the chamber 311. A bottom end of the moving member 32 is located in the chamber 311 of the receiving tube 31. A top end of the moving member 32 in Figure 2 extends out of the receiving tube 31 from the channel 312 and contacts the pressing member 51 of the mechanical switch 5 (see Figure 2). The moving member 32 is normally in a non-trigger position (i.e., the original position, see Figure 2) in which the pressing member 51 is not pressed, so the mechanical switch 5 is normally in the conducting state. When the moving member 32 moves upward from the non-trigger position to a trigger position (see FIG. 3 ) in response to the increase in pressure in the flow channel 11, the top end of the moving member 32 presses the pressing member 51, causing the mechanical switch 5 to enter the non-conducting state from the conducting state. When the moving member 32 moves downward from the trigger position back to the non-trigger position in response to the decrease in pressure in the flow channel 11, the top end of the moving member 32 no longer presses the pressing member 51, causing the mechanical switch 5 to return from the non-conducting state to the conducting state.

[0032] In this embodiment, the pressure triggering portion 3 also includes an elastic reset assembly for assisting the moving member 32 to move back to the non-triggering position, but this is not a necessary configuration. The elastic reset assembly includes an upper stopper 321 arranged on the moving member 32 and located outside the receiving tube 31, a lower stopper 322 arranged on the moving member 32 and located inside the receiving tube 31, and a compression spring 33 inserted into the moving member 32 and located inside the receiving tube 31. The stopper 321 can be blocked by a top of the receiving tube 31 to prevent the moving member 32 from moving further downward. The two ends of the compression spring 33 respectively abut against the lower stopper 322 and an inner wall 31a of the receiving tube 31.

[0033] As shown in Figure 3, the compression spring 33 can be compressed in the process that the moving member 32 moves up to the trigger position, and therefore accumulates an elastic force. When the moving member 32 begins to move down, the compression spring 33 promptly utilizes this elastic force to assist the moving member 32 to move down back to the non-trigger position.

[0034] In this embodiment, the pressure triggering unit 3 further includes an elastic diaphragm 35 disposed on the receiving tube 31, but this configuration is not essential. The elastic diaphragm 35 can be made of, but is not limited to, rubber or silicone. The elastic diaphragm 35 covers a lower opening 311a of the chamber 311 of the receiving tube 31, thereby separating the chamber 311 from the flow channel 11. The elastic diaphragm 35 can bulge upward (see Figure 3) or return to its original shape (see Figure 2) as the pressure in the flow channel 11 changes.

[0035] As shown in Figure 2, the bottom end 320a of the moving member 32 rests on the elastic diaphragm 35. When the elastic diaphragm 35 bulges upward, the moving member 32 is pushed upward by a middle portion of the elastic diaphragm 35, and when the moving member 32 moves downward, the middle portion of the elastic diaphragm 35 is pushed downward back to its original position by the moving member 32 and restored to its original state with the help of its own elasticity.

[0036] In this embodiment, as shown in FIG6 , one end of the power supply unit 22 is electrically connected to one end of the motor 21 of the pumping unit 2, the other end of the motor 21 is electrically connected to one end of the power switch 23, the other end of the power switch 23 is electrically connected to one end of the mechanical switch 5, the other end of the mechanical switch 5 is electrically connected to one end of the safety switch 27, and the other end of the safety switch 27 is electrically connected to the other end of the power supply unit 22. However, the safety switch 27 is not required, so the other end of the mechanical switch 5 can also be directly electrically connected to the other end of the power supply unit 22.

[0037] In this embodiment, as shown in FIG1 , an external button 23a of the power switch 23 is located on the oil pumping unit 2. When a user presses external button 23a, an internal button 23b (see FIG12 ) of the power switch 23 is also pressed, causing the power switch 23 to transition from a non-conductive state to a conductive state. Subsequently, when the user presses external button 23a again, internal button 23b is pressed again, causing the power switch 23 to return from the conductive state to the non-conductive state. In short, when external button 23a is pressed once, the power switch 23 is turned on, thereby transitioning to and maintaining the conductive state. When external button 23a is pressed again, the power switch 23 is turned off, thereby transitioning to and maintaining the non-conductive state, and so on. The operation of the safety switch 27 is substantially the same as that of the power switch 23 , except that the conduction of the safety switch 27 does not depend on the user pressing a button, but on the operation of a locking mechanism 7 (see FIG. 10 ), which will be described later.

[0038] After the electric oil pump of the present application is assembled with the oil barrel 61, as shown in Figures 2 and 6, as long as the power switch 23 and the safety switch 27 (if provided) are both turned on and in the conductive state, the motor 21 of the oil pumping unit 2 will begin to operate. This is because the mechanical switch 5 is normally in the conductive state, and the pressure in the flow channel 11 is low at this time. The running motor 21 drives the blades 14 to rotate, causing the oil (not shown) in the oil barrel 61 to be drawn into the oil extraction pipe 121, pushing open a ball plug 9 in the connecting seat 64, and flowing into the oil gun 62 through the flow channel 11. At this time, because a trigger 621 of the oil gun 62 is pressed, the oil in the oil gun 62 will continue to flow out through an oil outlet pipe 622 of the oil gun 62. However, once the trigger 621 of the oil gun 62 is released, as shown in FIG3 , the oil flowing into the oil gun 62 from the flow channel 11 cannot flow out of the oil outlet pipe 622 of the oil gun 62. This causes a sudden increase in the pressure in the flow channel 11, so that the movable member 32 of the pressure triggering unit 3 is pushed by the sudden increase in pressure and moves from the non-triggering position to the triggering position. At this triggering position, it presses the pressing member 51 of the mechanical switch 5, causing the mechanical switch 5 to enter a non-conducting state, at which point the motor 21 stops. In short, through the configuration of the pressure triggering unit 3 and the mechanical switch 5, the trigger 621 of the oil gun 62 can control the start or stop of the electric oil pump of the present application.

[0039] While the trigger 621 of the oil gun 62 is in the released state shown in FIG3 , the ball plunger 9 in the connector 64 returns to its original position shown in FIG2 (as indicated by the dotted circle line) because oil no longer flows outward, thereby blocking a hole 91 above the oil inlet 12. As shown in FIG3 , ideally, the oil in the flow channel 11 will remain in the flow channel 11, and the pressure in the flow channel 11 will be maintained above the predetermined upper limit, so that the pressing member 51 of the mechanical switch 5 is continuously pressed by the movable member 32, causing the motor 21 to remain in a stopped state. However, the ball plunger 9 may not completely block the hole 91, so the oil in the flow channel 11 may flow back toward the oil extraction pipe 121 through the small gap between the ball plunger 9 and the hole 91. If the backflow is too fast, the pressure in the flow channel 11 will quickly drop to below the predetermined lower limit, causing the movable member 32 to return to the non-trigger position too quickly, so that the motor 21 will quickly resume operation. However, at this time, the trigger 621 of the oil gun 62 is still in the release state, so the pressure in the flow channel 11 will quickly rise to above the upper limit, causing the motor 21 to stop running. In short, while the trigger 621 of the oil gun 62 is in the release state, if the aforementioned rapid backflow phenomenon occurs, the motor 21 will be caused to start and stop intermittently. To alleviate this problem, as shown in Figures 4 and 5, the pressure triggering part 3 also includes a buffer mechanism 4. However, this is not a necessary configuration. For example, if the ball plunger 9 performs well and there is no aforementioned rapid backflow phenomenon, or there is no need to alleviate the aforementioned problem, the buffer mechanism 4 can be omitted.

[0040] As shown in Figures 2, 4 and 5, buffer mechanism 4 is arranged on the receiving tube 31, in order to slow down the speed that moving part 32 returns to this non-triggering position.In this embodiment, receiving tube 31 inside also has a duct 312 that communicates with passage 310, and buffer mechanism 4 comprises a spring 41 and a steel ball 423 that are positioned in duct 312, and preferably also comprises a buttress 43. Steel ball 42 is positioned at one end of duct 312, and buttress 43 is fixed to the other end of duct 312. The two ends of spring 41 are respectively against buttress 43 and steel ball 42, and make steel ball 42 push toward moving part 32 by its elastic force, and keep the state of pressing moving part 32.Like this, spring 41 and steel ball 42 can be utilized to apply suitable compressive force to moving part 32, allow the movement of moving part 32 to encounter suitable resistance, to slow down the speed that moving part 32 descends.Like this, the problem that above-mentioned motor 21 starts and stops intermittently repeatedly can obtain suitable alleviation. In addition, an arc-shaped groove 323 is formed on the moving member 32 , and the steel ball 42 can slide into the arc-shaped groove 323 .

[0041] As shown in Figure 7 , the base 1 and the oil extraction unit 2 are separable, meaning that the oil extraction unit 2 can be attached to or removed from the base 1. In this embodiment, the mechanical switch 5 is mounted on the base 1, while the power switch 23 and safety switch 27 (if provided) are mounted on the oil extraction unit 2. The top portion of the base 1, facing the oil extraction unit 2, has two exposed first electrical contacts 52. These first electrical contacts 52 are electrically connected to the two ends of the mechanical switch 5. Each first electrical contact 52 may be, but is not limited to, a conductive metal pad. As shown in Figure 9 , the bottom portion of the oil extraction unit 2, facing the base 1, has two exposed second electrical contacts 28. One of these second electrical contacts 28 is electrically connected to the other end of the power switch 23, and the other is electrically connected to the other end of the safety switch 27. Each second electrical contact 28 is, but is not limited to, a pin of a predetermined length. When the oil pumping unit 2 is assembled with the base 1, the two first electrical contacts 52 of the base 1 are electrically connected to the two second electrical contacts 28 of the oil pumping unit 2. At this point, the mechanical switch 5, the power switch 23, the safety switch 27 (if provided), the power supply 22, and the motor 21 form a control circuit as shown in FIG6. Conversely, when the oil pumping unit 2 is detached from the base 1, the two first electrical contacts 52 of the base 1 are separated from the two second electrical contacts 28 of the oil pumping unit 2, and the control circuit is split into two parts.

[0042] In this embodiment, as shown in Figures 7 and 8 , the top of the base 1 has a convex cover 17. The mechanical switch 5 is located within the convex cover 17, and the two first electrical contacts 52 are located on a top surface of the convex cover 17. As shown in Figure 9 , the bottom of the oil extraction unit 2 has a receiving groove 203, and the two second electrical contacts 28 are located within the receiving groove 203. The receiving groove 203 is shaped to fit snugly within the convex cover 17. When the oil extraction unit 2 is assembled with the base 1, the convex cover 17 fits snugly into the receiving groove 203, and the two first electrical contacts 52 are electrically connected to the two second electrical contacts 28 of the oil extraction unit 2.

[0043] In this embodiment, the lock mechanism 7 shown in FIG1 includes at least one latching slot provided on the base 1. For example, as shown in FIG7 and FIG8 , a first protrusion 18 and two second protrusions 19 are formed on the top of the base 1. The first protrusion 18 has a first latching slot 181, and each of the second protrusions 19 has a second latching slot 191. Correspondingly, as shown in FIG9 , a first groove 201 and two second grooves 202 are formed on the bottom of the base 1. Furthermore, the rotating shaft 211b and the engaging block 212 of the motor 21 are located in the first groove 201.

[0044] As shown in Figures 7 and 8 , the locking mechanism 7 further includes at least one locking block and a handle 71 disposed on the oil pumping section 2. For example, two front locking blocks 731 and one rear locking block 732 are formed on a slide 73 on the oil pumping section 2. The handle 71 is used to move the at least one locking block, allowing the at least one locking block of the oil pumping section 2 to be inserted into or removed from the at least one retaining groove of the base 1. For example, the handle 71 is connected to a screw 72, which is threadedly engaged with the slide 73. Turning the handle 71 rotates the screw 72, which in turn causes the slide 73 to slide, causing the front and rear locking blocks 731 on the slide 73 to move accordingly.

[0045] When the oil extraction unit 2 is assembled with the base 1, not only will the convex cover 17 on the base 1 be wedged into the receiving groove 203 of the oil extraction unit 2, but the first protrusion 18 will also be inserted into the first groove 201, and each of the second protrusions 18 will also be inserted into the second grooves 202. At this point, the at least one latching block of the oil extraction unit 2 will be aligned with the at least one latching groove of the base 1 along the sliding path of the slide 73. For example, the rear latching block 731 will be aligned with the first latching groove 181, and the two front latching blocks 731 will be aligned with the two second latching grooves 191. Next, when the handle 71 is moved from an unlocked position shown in FIG7 to a locked position shown in FIG1 , driven by the forward rotation of the screw 72, the slide 73 slides linearly from an unlocked position shown in FIG10 to a locked position shown in FIG11 . At this time, the at least one latching block of the oil pumping unit 2 is engaged with the at least one latching groove of the base 1, for example, the rear latching block 731 is engaged with the first latching groove 181, and the two front latching blocks 731 are engaged with the two second latching grooves 191, thereby completing the operation of locking the oil pumping unit 2 to the base 1, ensuring that the oil pumping unit 2 will not fall off the base 1. Conversely, when the handle 71 is moved back from the locked position to the unlocked position, driven by the reverse rotation of the screw 72, the slide 73 slides linearly from the locked position back to the unblocked position, and the oil pumping unit 2 can be removed from the base 1.

[0046] It should be noted that, as shown in Figures 10 and 11, the safety switch 27 is located on one side of the slide 73. When the slide 73 reaches the locked position shown in Figure 11, a protrusion 734 on the side of the slide 73 presses a button 271 of the safety switch 27, thereby turning the safety switch 27 on, causing the safety switch 27 to transition from a non-conductive state to a conductive state. Conversely, when the slide 73 returns to the unlocked position shown in Figure 10, the protrusion 734 on the side of the slide 73 no longer presses the button 271 of the safety switch 27, thereby turning the safety switch 27 off, causing the safety switch 27 to transition from the conductive state to the non-conductive state.

[0047] In short, as long as the safety switch 27 is in the on state, it means that the handle 71 is in the locked position and the oil pumping unit 2 is securely locked to the base 1. At this time, as long as the power switch 23 is turned on, the motor 21 of the oil pumping unit 2 can operate as described above. Conversely, if the safety switch 27 is in the off state, it means that the oil pumping unit 2 is not securely locked to the base 1. In this case, even if the power switch 23 is turned on, the motor 21 of the oil pumping unit 2 will not operate.

[0048] In this embodiment, the oil pumping unit 2 further includes an outer shell 26 shown in FIG. 7 and an inner shell 25 shown in FIG. 12 . The inner shell 25 is located within the outer shell 26. The power switch 23 is disposed on an outer wall of the inner shell 25. The motor 21 is disposed within the inner shell 25, with a top portion of the motor 21 protruding from the inner shell 25. As shown in FIG. 12 and FIG. 13 , the inner shell 25 is provided with several through-holes 251 at designated locations through which the wires 24 required for the control circuit described above can pass. The wires 24 are routed along the outer wall of the inner shell 25. The outer wall of the inner shell 25 is formed with a plurality of wire securing hooks 252. These wire securing hooks 252 are used to secure the wires 24 to the outer wall of the inner shell 25, preventing them from falling off.

Claims

1. An electric oil pump, comprising: A base capable of being mounted on an oil drum and having a flow channel; an oil pumping unit, disposed on the base and capable of performing an oil pumping operation so that the oil in the oil barrel flows through the flow channel of the base; a power supply unit for supplying the power required by the oil pumping unit to perform the oil pumping operation; a mechanical switch electrically connecting the oil pumping unit and the power supply unit and having a pressing member, wherein when the pressing member is not pressed, the mechanical switch is in a non-conducting state, and when the pressing member is pressed, the mechanical switch is in a conducting state; and A pressure triggering portion is located between the mechanical switch and the flow channel, and can press the pressing member when the pressure of the flow channel is greater than an upper limit value, and can release the pressing of the pressing member when the pressure of the flow channel is lower than a lower limit value.

2. The electric oil pump according to claim 1, characterized in that: The pressure triggering part includes a receiving tube and a moving part, wherein a channel and a containing chamber are formed in the receiving tube, a bottom end of the moving part is located in the containing chamber of the receiving tube, and a top end of the moving part extends out of the receiving tube through the channel and contacts the pressing part of the mechanical switch, wherein the moving part is normally located in a non-triggering position where the pressing part is not pressed, and can move from the non-triggering position to a triggering position under the pressure of the flow channel, and press the pressing part at the triggering position.

3. The electric oil pump according to claim 2, characterized in that: The pressure triggering portion includes a buffer mechanism disposed on the receiving tube, and the buffer mechanism is used to slow down the speed at which the moving member returns from the triggering position to the non-triggering position.

4. The electric oil pump according to claim 2, characterized in that: The receiving tube also has a hole communicating with the channel, and the pressure triggering part also includes a spring and a steel ball located in the hole. The spring pushes the steel ball toward the moving part through its own elastic force and keeps the steel ball in a state of pressing against the moving part.

5. The electric oil pump according to claim 4, characterized in that: The moving part is also formed with an arc-shaped groove, and the steel ball can slide into the arc-shaped groove.

6. The electric oil pump according to any one of claims 1 to 5, characterized in that: It includes a power switch and a safety switch, one end of the power supply part is electrically connected to one end of a motor of the oil pumping part, the other end of the motor is electrically connected to one end of the power switch, the other end of the power switch is electrically connected to one end of the mechanical switch, the other end of the mechanical switch is electrically connected to one end of the safety switch, and the other end of the safety switch is electrically connected to the other end of the power supply part.

7. The electric oil pump according to any one of claims 1 to 5, characterized in that: It includes a power switch, one end of the power supply unit is electrically connected to one end of a motor of the oil pumping unit, the other end of the motor is electrically connected to one end of the power switch, the other end of the power switch is electrically connected to one end of the mechanical switch, and the other end of the mechanical switch is electrically connected to the other end of the power supply unit.

8. The electric oil pump according to claim 6, wherein the oil pumping part can be assembled on the base and can also be removed from the base; The mechanical switch is arranged on the base, and the power switch and the safety switch are both arranged on the oil pumping part. The base has two first electrical contacts exposed to the outside at a top opposite to the oil pumping part, and the two first electrical contacts are electrically connected to the two ends of the mechanical switch; the oil pumping part has two second electrical contacts exposed to the outside at a bottom opposite to the base, one of the second electrical contacts is electrically connected to the other end of the power switch, and the other second electrical contact is electrically connected to the end of the safety switch; when the oil pumping part is combined on the base, the two first electrical contacts of the base are electrically connected to the two second electrical contacts of the oil pumping part respectively; when the oil pumping part is detached from the base, the two first electrical contacts of the base are separated from the two second electrical contacts of the oil pumping part.

9. The electric oil pump according to claim 8, characterized in that: The top of the base has a convex cover, the mechanical switch is located in the convex cover, and the two first electrical contacts are located on a top surface of the convex cover; the bottom of the oil pumping part has a receiving groove, and the two second electrical contacts are located in the receiving groove; when the oil pumping part is assembled on the base, the convex cover is wedged into the receiving groove.

10. The electric oil pump according to claim 9, characterized in that: The oil pumping unit includes an outer shell and an inner shell located inside the outer shell, the power switch is arranged on an outer wall surface of the inner shell, the motor is arranged inside the inner shell, and a top of the motor is exposed from the inner shell; wherein, the outer wall surface of the inner shell is formed with a plurality of wire fixing hooks, and the wires for electrically connecting the power supply unit, the motor, the power switch, the mechanical switch and the safety switch are arranged along the outer wall surface of the inner shell, and the wire fixing hooks are used to hook the wires.

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