Cranked piston electric pump

Abstract

The utility model relates to hydraulic oil pump technical field especially is involved in a crank piston formula electric pump, including pump body, the pump body has working chamber, first hydraulic chamber and second hydraulic chamber, first hydraulic chamber with second hydraulic chamber all with working chamber communicate and set up oppositely, piston subassembly, two piston subassembly are located in first hydraulic chamber with second hydraulic chamber, be provided with one -way subassembly on piston subassembly, power subassembly, power subassembly output end passes through crank subassembly and is connected with two piston subassembly end portion, crank subassembly is located in working chamber, one -way valve subassembly, two one -way valve subassembly are installed in first hydraulic chamber with second hydraulic chamber end portion, with first hydraulic chamber with second hydraulic chamber still have liquid discharge pipe intercommunication, liquid inlet pipe, liquid inlet pipe install on pump body and with working chamber communicate, the utility model reduces the occupation space of electric hydraulic oil pump.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic pump technology, and in particular to a crank piston electric pump. Background Technology

[0002] Hydraulic systems play a vital role in many mechanical devices, and the hydraulic oil pump, as the core power source of the hydraulic system, has a profound impact on the operating efficiency and reliability of the entire system through its performance and design.

[0003] Currently, electric hydraulic pumps hold a significant position in the market. Driven by an electric motor, they convert mechanical energy into hydraulic energy, thus providing power to hydraulic systems. However, existing electric hydraulic pumps face several pressing issues in practical applications. First, their generally large size necessitates substantial space during installation. In space-constrained equipment or working environments, such as small construction machinery, compact industrial production lines, and hydraulic tipping lifting systems, this large size undoubtedly causes significant inconvenience during installation, limiting the application range of the hydraulic system. Second, their large size translates to greater weight, increasing not only the overall weight of the equipment but also adding extra difficulty to handling and installation. Furthermore, when disassembling and maintaining the hydraulic pump, its weight often requires operators to utilize more tools and equipment, consuming more time and effort, resulting in low maintenance efficiency and increased maintenance costs.

[0004] Therefore, those skilled in the art are dedicated to developing a crank-piston type electric pump that reduces the space occupied by electric hydraulic pumps and facilitates disassembly and maintenance. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a crank-piston type electric pump that reduces the space occupied by the electric hydraulic pump and facilitates disassembly and maintenance.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A crank-piston type electric pump, including The pump body has a working chamber, a first hydraulic chamber and a second hydraulic chamber, wherein the first hydraulic chamber and the second hydraulic chamber are both connected to the working chamber and are arranged opposite to each other; Piston assembly, wherein two piston assemblies are respectively located in the first hydraulic chamber and the second hydraulic chamber, and the piston assembly is provided with a one-way component; A power assembly, the output end of which is connected to the ends of the two piston assemblies via a crank assembly, the crank assembly being located within the working chamber; A one-way valve assembly, wherein two one-way valve assemblies are respectively installed at the ends of the first hydraulic chamber and the second hydraulic chamber, and the first hydraulic chamber and the second hydraulic chamber are also connected to a drain pipe; An inlet pipe is installed on the pump body and communicates with the working chamber; The rotation of the power component drives the two piston assemblies to move along the first hydraulic chamber and the second hydraulic chamber respectively, so that the hydraulic oil in the working chamber enters between the piston assembly and the one-way valve assembly after passing through the one-way component.

[0007] The beneficial effects of adopting the above scheme are: hydraulic oil enters the working chamber through the inlet pipe, the power component rotates and drives the two piston assemblies to move along the first hydraulic chamber and the second hydraulic chamber respectively, the hydraulic oil in the working chamber enters between the piston assembly and the one-way valve assembly after passing through the one-way assembly, and after being pressurized by the piston assembly, it is discharged from the one-way valve assembly and enters the drain pipe. Hydraulic oil enters the hydraulic chamber through the piston assembly. The oil inlet pipe is integrated into the piston head to reduce the installation space of the oil inlet components. At the same time, low-temperature hydraulic oil enters the hydraulic chamber from the working chamber through the piston head assembly. It is used not only to lubricate the crank assembly in the working chamber, but also to remove the heat generated by the crank assembly and piston assembly during operation, reducing the heat accumulation on the moving parts. The pump body is equipped with two opposing first and second hydraulic chambers, each with a piston assembly. This maintains the balance of the power components during pumping, extends the service life of the motor, and features a simple structure, small and lightweight pump body, which facilitates subsequent disassembly and maintenance.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, the piston assembly includes a piston head, a sealing ring is installed in the middle of the piston head, and the piston head is connected to the crank assembly via a rotating pin and a connecting rod.

[0010] The beneficial effect of adopting the above-mentioned further solution is that the sealing ring installed in the middle of the piston head can effectively prevent the leakage of hydraulic oil between the piston head and the hydraulic chamber wall, thereby improving the sealing performance of the pump.

[0011] Furthermore, the one-way assembly includes an oil inlet passage disposed on the piston head, and a piston sealing gasket is installed at the end of the piston head by a limiting pin. The piston sealing gasket is located at the end of the oil inlet passage. The hydraulic oil in the working chamber enters between the piston head and the one-way valve assembly after passing through the oil inlet passage and opening the piston sealing gasket.

[0012] The advantages of adopting the above-mentioned further solution are: the oil inlet pipe is integrated into the piston head, reducing the layout of the oil inlet pipe and facilitating the rapid removal of heat generated during the operation of the piston head; the piston seal can effectively prevent the leakage and backflow of hydraulic oil between the piston head and the hydraulic chamber wall, allowing the hydraulic oil to flow in one direction.

[0013] Furthermore, the crank assembly includes an eccentric shaft with a balance block, the output end of the power assembly is connected to the eccentric shaft, and a support bearing is provided between the power assembly and the eccentric shaft; The eccentric shaft is connected to the connecting rod via a rotary bearing, and the connecting rod has a mounting groove for fixing the rotary bearing.

[0014] The beneficial effects of adopting the above-mentioned further solutions are: the support bearing set between the eccentric shaft and the power assembly, and the connection between the eccentric shaft and the connecting rod through the rotary bearing, can effectively reduce sliding friction and reduce energy consumption; The balance weights installed on the eccentric shaft can balance the unbalanced load of the motor during operation, reduce the wear of the motor rotor, and extend the service life of the motor.

[0015] Furthermore, the one-way valve assembly includes a one-way valve body, which has a one-way valve chamber. The one-way valve chamber communicates with the first hydraulic chamber or the second hydraulic chamber through an inlet hole. The one-way valve chamber also communicates with the drain pipe. A one-way spring and a one-way steel ball are installed inside the one-way valve chamber. A one-way plug is also installed on the one-way valve body. The two ends of the one-way spring abut against the one-way plug and the one-way steel ball, respectively. The one-way steel ball is located at the end of the inlet hole.

[0016] The beneficial effect of adopting the above-mentioned further solution is that the one-way spring and one-way steel ball in the one-way valve chamber can effectively prevent the hydraulic oil from flowing back during operation and ensure the one-way flow of the hydraulic oil.

[0017] Furthermore, an overflow valve assembly is also installed on the pump body, and the overflow valve assembly communicates with the first hydraulic chamber or the second hydraulic chamber between the piston assembly and the check valve assembly.

[0018] The beneficial effect of adopting the above-mentioned further solution is that the relief valve assembly can automatically open when the system pressure is too high, draining excess hydraulic oil back into the inlet pipe and preventing damage to the electric pump and hydraulic system caused by excessive system pressure.

[0019] Furthermore, the overflow valve assembly includes an overflow pipe that communicates with the piston assembly and the one-way valve assembly. The overflow pipe communicates with the overflow groove through an overflow hole, and the overflow groove communicates with the overflow channel. The overflow channel is connected to the inlet pipe. An overflow adjusting bolt is installed at the end of the overflow channel. An overflow spring and an overflow steel ball are installed inside the overflow channel. The overflow steel ball is used to seal the end of the overflow channel. The two ends of the overflow spring abut against the overflow adjusting bolt and the overflow steel ball, respectively.

[0020] The beneficial effect of adopting the above-mentioned further solution is that the overflow spring, overflow steel ball and overflow adjusting screw can accurately control the opening and closing of the overflow valve, and improve the adjustment accuracy of the overflow valve. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a crank-piston type electric pump according to a specific embodiment of the present invention; Figure 2 This is a schematic diagram of the exploded structure of a crank-piston electric pump according to a specific embodiment of the present invention; Figure 3 This is a schematic diagram of the piston assembly and one-way assembly structure according to a specific embodiment of the present invention; Figure 4 This is a schematic diagram of the one-way valve assembly structure according to a specific embodiment of the present invention; Figure 5 This is a schematic diagram of the overflow valve assembly structure according to a specific embodiment of the present invention. Figure 1 ; Figure 6 This is a schematic diagram of the overflow valve assembly structure according to a specific embodiment of the present invention. Figure 2 ; Figure 7 The following is a specific embodiment of the piston assembly and crank assembly in motion. Figure 1 ; Figure 8 The following is a specific embodiment of the piston assembly and crank assembly in motion. Figure 2 ; Figure 9 The following is a specific embodiment of the piston assembly and crank assembly in motion. Figure 3 .

[0022] The attached diagram lists the components represented by each number as follows: 1. Pump body; 2. Working chamber; 3. First hydraulic chamber; 4. Second hydraulic chamber; 5. Piston assembly; 6. One-way assembly; 7. Power assembly; 8. Crank assembly; 9. One-way valve assembly; 10. Drain pipe; 11. Inlet pipe; 12. Piston head; 13. Sealing ring; 14. Rotating pin; 15. Connecting rod; 16. Oil inlet passage; 17. Limit pin; 18. Piston gasket; 19. Eccentric shaft; 20. 21. Balance block; 22. Support bearing; 23. Rotary bearing; 24. Mounting groove; 25. One-way valve body; 26. One-way valve chamber; 27. Liquid inlet; 28. One-way spring; 29. ​​One-way steel ball; 30. One-way plug; 31. Overflow valve assembly; 32. Overflow pipe; 33. Overflow hole; 34. Overflow groove; 35. Overflow spring; 36. Overflow steel ball; 37. Overflow adjusting bolt. Detailed Implementation

[0023] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0024] In the description of this utility model, it should be understood that the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "inner", "outer", "circumferential", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the system or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, a crank piston electric pump includes a pump body 1, which serves as the oil circuit carrier and mounting carrier for all parts. The pump body 1 has a working chamber 2, a first hydraulic chamber 3, and a second hydraulic chamber 4. The first hydraulic chamber 3 and the second hydraulic chamber 4 are both connected to the working chamber 2 and are arranged opposite to each other. Piston assembly 5, two piston assemblies 5 are located in the first hydraulic chamber 3 and the second hydraulic chamber 4 respectively, and are the power execution components of the system. Piston assembly 5 is provided with a one-way component 6, which is used to control the one-way flow of hydraulic oil and prevent backflow. The power component 7 is the power source of the system and can be an electric motor. The output end of the power component 7 is connected to the ends of the two piston assemblies 5 through the crank assembly 8. The crank assembly 8 is located in the working chamber 2 and is used to convert the rotational motion of the power component 7 into the reciprocating oscillation of the piston assembly 5. One-way valve assemblies 9 are installed at the ends of the first hydraulic chamber 3 and the second hydraulic chamber 4, respectively. The first hydraulic chamber 3 and the second hydraulic chamber 4 are also connected by a drain pipe 10, which serves as an output channel for high-pressure hydraulic oil and is used to connect with other hydraulic equipment. The inlet pipe 11 is installed on the pump body 1 and communicates with the working chamber 2, and is used to deliver hydraulic oil into the pump body 1. The rotation of the power component 7 drives the two piston components 5 to move along the first hydraulic chamber 3 and the second hydraulic chamber 4 respectively, so that the hydraulic oil in its working chamber 2 enters between the piston component 5 and the one-way valve component 9 after passing through the one-way component 6, thus completing the oil suction and delivery to the pressure side.

[0028] like Figure 1 , Figure 2 , Figure 3 , Figure 7 , Figure 8 and Figure 9 As shown, in some embodiments, the piston assembly 5 includes a piston head 12, and a sealing ring 13 is installed in the middle of the piston head 12. The sealing ring 13 may be an O-ring. The sealing ring 13 and the piston hole wall of the pump body 1 form a sliding sealing structure, which effectively prevents hydraulic oil from leaking between the piston head 12 and the hydraulic chamber wall. The piston head 12 is connected to the crank assembly 8 through a rotating pin 14 and a connecting rod 15.

[0029] The one-way assembly 6 includes an oil inlet passage 16 disposed on the piston head 12. The oil inlet passage 16 is the channel for hydraulic oil to enter the pressurization side. A piston seal 18 is installed at the end of the piston head 12 via a limiting pin 17. The piston seal 18 is located at the end of the oil inlet passage 16. The hydraulic oil in the working chamber 2 enters between the piston head 12 and the one-way valve assembly 9 after passing through the oil inlet passage 16 and opening the piston seal 18. During operation, when one of the piston assemblies 5 moves to the right, the pressure generated by the hydraulic oil in the working chamber 2 through the oil inlet passage 16 and the vacuum generated between the piston head 12 and the one-way valve assembly 9 pushes open the piston seal 18, allowing the hydraulic oil to smoothly enter between the piston head 12 and the one-way valve assembly 9, completing the oil suction process. When piston assembly 5 moves to the left, the hydraulic oil on the pressure side forms high pressure, which pushes piston sealing gasket 18 to fit tightly against the wall of piston head 12 to form a seal, blocking the working chamber 2 from the pressure side and ensuring that hydraulic oil can only be delivered to the one-way valve assembly 9. The movement direction of the other piston assembly 5 is opposite to that of the piston assembly 5 mentioned above.

[0030] like Figure 1 , Figure 2 As shown, in another embodiment, the crank assembly 8 includes an eccentric shaft 19, which forms an eccentric wheel structure. The eccentric shaft 19 has a balance block 20 (i.e., an eccentric counterweight rotating shaft). The balance block 20 can balance the off-center load generated by the motor pressure on the main shaft as much as possible during the operation of the power assembly 7, reducing rotor wear. The output end of the power assembly 7 is tightly connected to the eccentric shaft 19. A support bearing 21 is provided between the power assembly 7 and the eccentric shaft 19. The support bearing 21 can support the motor and the pump body 1, preventing the rotor of the power assembly 7 from swinging when it is working. A pin is mounted on the eccentric shaft 19, and a rotating bearing 22 is press-fitted onto the pin by an interference fit. The eccentric shaft 19 is connected to the connecting rod 15 through the rotating bearing 22. The connecting rod 15 has a mounting groove 23 for fixing the rotating bearing 22. The mounting groove 23 matches the outer ring of the rotating bearing 22, which can effectively reduce the sliding friction of the connecting rod 15 during movement and reduce the wear of the connecting rod 15.

[0031] like Figure 2 and Figure 4As shown, in this embodiment, the one-way valve assembly 9 includes a one-way valve body 24, which has a one-way valve chamber 25. The one-way valve chamber 25 communicates with the first hydraulic chamber 3 or the second hydraulic chamber 4 through the inlet hole 26. The one-way valve chamber 25 also communicates with the drain pipe 10 to form an output channel for high-pressure hydraulic oil. A one-way spring 27 and a one-way steel ball 28 are installed in the one-way valve chamber 25. A one-way plug 29 is also installed on the one-way valve body 24. The two ends of the one-way spring 27 abut against the one-way plug 29 and the one-way steel ball 28, respectively. The one-way steel ball 28 is located at the end of the inlet hole 26. An O-ring is also installed on the one-way valve body 24. The O-ring forms a seal with the wall of the pump body 1, blocking the flow of hydraulic oil in the pressurization oil circuit and the pressurization side. When the hydraulic oil on the pressurizing side reaches high pressure, it pushes the one-way steel ball 28 to compress the one-way spring 27, causing the one-way steel ball 28 to separate from the end of the inlet hole 26. The high-pressure hydraulic oil enters the one-way valve chamber 25 and is then output through the drain pipe 10. When oil is sucked in, the one-way spring 27 returns to its original position, pushing the one-way steel ball 28 to block the inlet hole 26, preventing the hydraulic oil in the drain pipe 10 from flowing back to the pressurizing side.

[0032] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown in the embodiment, the pump body 1 is also equipped with an overflow valve assembly 30. The overflow valve assembly 30 is connected to the first hydraulic chamber 3 or the second hydraulic chamber 4 between the piston assembly 5 and the check valve assembly 9, and is used to control the system pressure to avoid damage to the system due to excessive pressure.

[0033] Specifically, the overflow valve assembly 30 includes an overflow pipe 31, which is connected to the pressurization oil circuit between the piston assembly 5 and the one-way valve assembly 9. The overflow pipe 31 is connected to the overflow groove 33 through the overflow hole 32. The overflow groove 33 is connected to the overflow channel 34. The overflow channel 34 is connected to the inlet pipe 11. An overflow adjusting bolt 37 is installed at the end of the overflow channel 34. An overflow spring 35 and an overflow steel ball 36 are installed in the overflow channel 34. The overflow steel ball 36 is used to block the end of the overflow channel 33. The two ends of the overflow spring 35 abut against the overflow adjusting bolt 37 and the overflow steel ball 36, respectively. When the system pressure exceeds the set value, hydraulic oil acts on the overflow ball 36 through the overflow pipe 31 and overflow hole 32, pushing the overflow ball 36 to compress the overflow spring 35 and move it to the left, opening the overflow channel. The hydraulic oil then flows back to the inlet pipe 11 through the overflow groove 33 and overflow channel 34, and then flows into the oil storage area or oil tank. When the system pressure drops, the overflow spring 35 resets, pushing the overflow ball 36 to the right, re-sealing the end of the overflow groove 33, and isolating the oil storage area from the pressure area. By adjusting the position of the overflow adjusting bolt 37, the compression distance and preload of the overflow spring 35 can be changed, thereby precisely adjusting the opening pressure of the overflow valve assembly 30. It also prevents foreign objects from entering the overflow valve assembly 30 and affecting its operation.

[0034] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A crank-piston type electric pump, characterized in that: include The pump body (1) has a working chamber (2), a first hydraulic chamber (3) and a second hydraulic chamber (4), the first hydraulic chamber (3) and the second hydraulic chamber (4) are both connected to the working chamber (2) and are arranged opposite to each other; Piston assembly (5), the two piston assemblies (5) are respectively located in the first hydraulic chamber (3) and the second hydraulic chamber (4), and the piston assembly (5) is provided with a one-way component (6). The power assembly (7) has its output end connected to the ends of the two piston assemblies (5) via a crank assembly (8), which is located inside the working chamber (2). One-way valve assembly (9), two one-way valve assemblies (9) are respectively installed at the ends of the first hydraulic chamber (3) and the second hydraulic chamber (4), and the first hydraulic chamber (3) and the second hydraulic chamber (4) are also connected to a drain pipe (10). Liquid inlet pipe (11), the liquid inlet pipe (11) is installed on the pump body (1) and communicates with the working chamber (2); The power component (7) rotates and drives the two piston components (5) to move along the first hydraulic chamber (3) and the second hydraulic chamber (4) respectively, so that the hydraulic oil in the working chamber (2) enters between the piston component (5) and the one-way valve component (9) after passing through the one-way component (6).

2. The crank-piston electric pump according to claim 1, characterized in that: The piston assembly (5) includes a piston head (12), a sealing ring (13) is installed in the middle of the piston head (12), and the piston head (12) is connected to the crank assembly (8) through a rotating pin (14) and a connecting rod (15).

3. The crank-piston electric pump according to claim 2, characterized in that: The one-way assembly (6) includes an oil inlet passage (16) disposed on the piston head (12). A piston seal (18) is installed at the end of the piston head (12) by a limiting pin (17). The piston seal (18) is located at the end of the oil inlet passage (16). The hydraulic oil in the working chamber (2) enters between the piston head (12) and the one-way valve assembly (9) after passing through the oil inlet passage (16) and opening the piston seal (18).

4. The crank-piston electric pump according to claim 2, characterized in that: The crank assembly (8) includes an eccentric shaft (19) with a balance block (20), the output end of the power assembly (7) is connected to the eccentric shaft (19), and a support bearing (21) is provided between the power assembly (7) and the eccentric shaft (19). The eccentric shaft (19) is connected to the connecting rod (15) via a rotating bearing (22), and the connecting rod (15) has a mounting groove (23) for fixing the rotating bearing (22).

5. The crank-piston electric pump according to claim 1, characterized in that: The one-way valve assembly (9) includes a one-way valve body (24), which has a one-way valve chamber (25). The one-way valve chamber (25) is connected to the first hydraulic chamber (3) or the second hydraulic chamber (4) through an inlet hole (26). The one-way valve chamber (25) is also connected to the drain pipe (10). A one-way spring (27) and a one-way steel ball (28) are installed in the one-way valve chamber (25). A one-way plug (29) is also installed on the one-way valve body (24). The two ends of the one-way spring (27) abut against the one-way plug (29) and the one-way steel ball (28) respectively. The one-way steel ball (28) is located at the end of the inlet hole (26).

6. The crank-piston electric pump according to claim 1, characterized in that: The pump body (1) is also equipped with an overflow valve assembly (30), which is connected to the first hydraulic chamber (3) or the second hydraulic chamber (4) between the piston assembly (5) and the check valve assembly (9).

7. The crank-piston electric pump according to claim 6, characterized in that: The overflow valve assembly (30) includes an overflow pipe (31), which is connected to the piston assembly (5) and the one-way valve assembly (9). The overflow pipe (31) is connected to the overflow groove (33) through the overflow hole (32), and the overflow groove (33) is connected to the overflow channel (34). The overflow channel (34) is connected to the inlet pipe (11). An overflow adjusting bolt (37) is installed at the end of the overflow channel (34). An overflow spring (35) and an overflow steel ball (36) are installed inside the overflow channel (34). The overflow steel ball (36) is used to block the end of the overflow channel (33). The two ends of the overflow spring (35) abut against the overflow adjusting bolt (37) and the overflow steel ball (36) respectively.

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