Handheld double-tube single-connection electric hydraulic pump

Abstract

The present invention provides a handheld double-tube single-connection electric hydraulic pump, which includes a handheld seat, a driving assembly, an oil bag, an oil pumping assembly, an oil outlet assembly and a pressure relief assembly. The driving assembly, the oil pumping assembly and the oil outlet assembly are connected in sequence along the axial direction. The oil outlet assembly includes an oil outlet connection seat, an oil pipe interface, and an oil outlet pipe and an oil return pipe arranged in the oil pipe interface. The oil pipe interface is connected to the oil pumping assembly through the oil outlet seat, and the oil outlet pipe and the oil return pipe are respectively connected to the oil outlet hole and the oil bag of the oil pumping assembly through the oil outlet connection seat. The pressure relief and pressure regulating assembly includes a pressure relief block, a pressure relief switch and a regulating valve. The pressure relief block is arranged on the oil outlet connection seat. The pressure relief block has a pressure relief oil circuit and a pressure regulating oil circuit respectively connected to the oil outlet hole and the oil bag of the oil pumping assembly. The pressure relief switch opens or closes the pressure relief oil circuit; the regulating valve is arranged in the pressure regulating oil circuit, and when the pressure relief oil circuit is closed, it adjusts the oil pressure output from the oil outlet hole of the oil pumping assembly to the oil outlet pipe.

Description

Technical Field

[0001] The invention relates to the field of hydraulic technology, and in particular to a handheld double-tube single-connection electric hydraulic pump. Background Art

[0002] In various rescue sites, rescue teams and police will use special emergency rescue tools to break metal or non-metal structures and rescue victims trapped in dangerous environments. Among these rescue tools, the electric hydraulic pump that provides the power source is one of the indispensable and important tools. The electric hydraulic pumps currently on the market are very large and heavy, which is not only difficult to carry, but also greatly limits the area in which they can work. It is difficult for them to operate in some small spaces, such as some narrow gaps at the disaster relief site.

[0003] In addition, the existing oil circuit of the electric hydraulic pump is very complicated. The complexity of the oil circuit not only makes the electric hydraulic pump very large, but also the more complicated the oil circuit is, the higher the risk of leakage will be, and the worse the safety performance will be. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a handheld double-tube single-connection electric hydraulic pump.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a handheld double-tube single-connection electric hydraulic pump, which includes a handheld seat, a driving assembly, an oil bag, an oil pump assembly, an oil outlet assembly and a pressure relief assembly. The driving assembly, the oil pump assembly and the oil outlet assembly are connected in sequence along the axial direction. The oil outlet assembly includes an oil outlet connection seat, an oil pipe interface, and an oil outlet pipe and an oil return pipe arranged in the oil pipe interface. The oil pipe interface is connected to the oil pump assembly through the oil outlet seat, and the oil outlet pipe and the oil return pipe are respectively connected to the oil outlet hole and the oil bag of the oil pump assembly through the oil outlet connection seat. The pressure relief and pressure regulating assembly includes a pressure relief block, a pressure relief switch and a regulating valve. The pressure relief block is arranged on the oil outlet connection seat. The pressure relief block has a pressure relief oil circuit and a pressure regulating oil circuit respectively connected to the oil outlet hole and the oil bag of the oil pump assembly. The pressure relief switch opens or closes the pressure relief oil circuit; the regulating valve is arranged in the pressure regulating oil circuit, and when the pressure relief oil circuit is closed, it adjusts the oil pressure output from the oil outlet hole of the oil pump assembly to the oil outlet pipe.

[0006] According to one embodiment of the present invention, the pressure relief block is provided with an oil inlet hole, an oil return hole, a first pressure regulating oil hole, a first oil groove, a second pressure regulating oil hole and a second oil groove, the oil inlet hole is connected to the oil outlet hole of the oil pump assembly, the oil return hole is connected to the oil bag, the regulating valve is arranged between the oil inlet hole and the first pressure regulating oil hole, the first oil groove is connected to the first pressure regulating oil hole and the second pressure regulating oil hole, and the second oil groove is connected to the second pressure regulating oil hole and the oil return hole;

[0007] The pressure relief switch connects or blocks the pressure relief oil path between the oil inlet hole and the oil return hole;

[0008] The regulating valve regulates or blocks the pressure regulating oil circuit composed of the oil inlet hole, the first pressure regulating oil hole, the first oil groove, the second pressure regulating oil hole, the second oil groove and the oil return hole.

[0009] According to one embodiment of the present invention, the oil outlet connection seat includes a pump body connection seat and an oil pipe connection seat which are sealed and connected, the pump body connection seat is connected to the oil pump assembly, the oil pipe connection seat is connected to the oil pipe joint, and the oil pipe connection seat has an oil outlet channel and an oil return channel which are connected to the oil outlet pipe and the oil return pipe respectively.

[0010] According to one embodiment of the present invention, the oil pump assembly is provided with a plurality of oil outlet holes, and the pump body connecting seat is provided with a strip-shaped oil groove which penetrates the pump body connecting seat axially, the strip-shaped oil groove is connected to the plurality of oil outlet holes on the oil pump assembly, and the oil pumped out of the plurality of oil outlet holes is collected and input into the oil outlet channel of the oil pipe connecting seat, and the pressure regulating oil circuit is connected to the strip-shaped oil groove.

[0011] According to an embodiment of the present invention, the strip oil groove is composed of multiple oil groove sub-segments, the strip oil groove between two adjacent oil outlet holes is an oil groove sub-segment, and the cross-sectional midline of the oil groove sub-segment is a straight line or an arc.

[0012] According to one embodiment of the present invention, the oil pump assembly has three oil outlet holes evenly distributed along the circumferential direction, the second oil outlet hole and the third oil outlet hole are close to the pressure relief and pressure regulating assembly, the cross-sectional midline of the oil groove sub-segment connecting the first oil outlet hole and the second oil outlet hole is a straight line, and the cross-sectional midline of the oil groove sub-segment connecting the second oil outlet hole and the third oil outlet hole is an arc line, which protrudes toward the side where the pressure relief and pressure regulating assembly is located, and the two oil groove sub-segments form a sickle-shaped strip oil groove.

[0013] According to one embodiment of the present invention, a guide groove passing through the strip oil groove is provided on the surface where the pump body connecting seat contacts the oil pipe connecting seat. The guide groove is connected to the oil outlet channel on the oil pipe connecting seat and guides the oil output from the strip oil groove into the oil outlet channel.

[0014] According to one embodiment of the present invention, the oil pipe connecting seat has an extension section formed in the circumference of the oil return channel and protruding from the surface of the oil pipe connecting seat, and the pump body connecting seat has a groove matching the extension section, and the extension section of the oil return channel extends into the groove of the pump body connecting seat.

[0015] According to one embodiment of the present invention, the surface where the oil pipe connecting seat contacts the pump body connecting seat has an axial sealing groove located outside the oil outlet channel and the oil return channel, and the sealing ring in the axial sealing groove seals the contact surface between the oil pipe connecting seat and the pump body connecting seat.

[0016] According to an embodiment of the present invention, a radial sealing groove is provided on the extension section of the oil return passage, and a sealing ring disposed in the radial sealing groove seals the extension section and a groove matched therewith.

[0017] In summary, in the handheld double-tube single-connection electric hydraulic pump provided by the present invention, the drive assembly, the oil pump assembly and the oil outlet assembly are connected in sequence along the axial direction. This arrangement allows the handheld double-tube single-connection electric hydraulic pump to extend axially as a whole, greatly reducing the volume of the electric hydraulic pump. The oil outlet pipe and the oil return pipe on the oil outlet assembly are integrated in the same oil pipe interface to achieve the effect of double-tube single connection, which not only greatly facilitates the connection between the electric hydraulic pump and the working head, but also further realizes the miniaturization of the electric hydraulic pump. The pressure relief and pressure regulating assembly integrates manual pressure relief and automatic pressure relief. This arrangement can well ensure the miniaturization of the electric hydraulic pump while having good safety.

[0018] In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Shown is a schematic structural diagram of a handheld double-tube single-connection electric hydraulic pump provided in one embodiment of the present invention.

[0020] Figure 2 and Figure 3 Shown Figure 1 Schematic diagram of the structure from another perspective.

[0021] Figure 4 Shown Figure 2 Schematic cross-section diagram of .

[0022] Figure 5 Shown Figure 4 A magnified schematic diagram of center A.

[0023] Figure 6 The figure shows the automatic pressure relief Figure 3 Schematic cross-sectional view of the oil inlet hole and the first pressure regulating oil hole.

[0024] Figure 7 The figure shows the automatic pressure relief Figure 3 Schematic diagram of the cross section through the second pressure regulating oil hole and the oil return hole.

[0025] Figure 8 The figure shows the assembly diagram of the pressure relief switch and the pressure relief block during manual pressure relief.

[0026] Fig. 9 Manual pressure relief is shown. Figure 3 Schematic diagram of the cross section through the second pressure regulating oil hole and the oil return hole.

[0027] Fig.10 Shown is a schematic structural diagram of the pressure relief block.

[0028] Fig.11 The figure shows the structural diagram of the pump body connection seat.

[0029] Fig.12 Shown is a schematic structural diagram of the oil pipe connecting seat. DETAILED DESCRIPTION

[0030] like Figures 1 to 3 As shown, the handheld double-tube single-connection electric hydraulic pump provided in this embodiment includes a handheld seat 1, a drive assembly 2, an oil bag (not shown in the figure due to viewing angle), an oil pump assembly 3, an oil outlet assembly 4, and a pressure relief and pressure regulating assembly 5. The drive assembly 2, the oil pump assembly 3, and the oil outlet assembly 4 are connected in sequence along the axial direction. The oil outlet assembly 4 includes an oil outlet connection seat 41, an oil pipe interface 42, and an oil outlet pipe 43 and an oil return pipe 44 arranged in the oil pipe interface 42. The oil pipe interface 42 is connected to the oil pump assembly 3 through the oil outlet seat 41, and the oil outlet pipe 43 and the oil return pipe 44 are connected to the oil outlet hole and the oil bag of the oil pump assembly 3 through the oil outlet connection seat 41. The pressure relief and pressure regulating assembly 5 includes a pressure relief block 51, a pressure relief switch 52 and a regulating valve 53. The pressure relief block 51 is arranged on the oil outlet connecting seat 41. The pressure relief block 51 has a pressure relief oil circuit and a pressure regulating oil circuit respectively connected to the oil outlet hole of the oil pump assembly 3 and the oil bag. The pressure relief switch 52 opens or closes the pressure relief oil circuit; the regulating valve 53 is arranged in the pressure regulating oil circuit, and when the pressure relief switch 52 closes the pressure relief oil circuit, it adjusts the oil pressure output from the oil pump assembly 3 to the oil outlet pipe 43.

[0031] The drive assembly 2, the oil pump assembly 3 and the oil outlet assembly 4 connected in sequence along the axial direction in the handheld double-tube single-connection electric hydraulic pump provided in this embodiment greatly reduce the volume of the equipment and realize the miniaturization of the equipment. The ingenious design of the pressure relief and pressure regulating assembly 5 integrating automatic pressure regulation and manual pressure relief not only ensures the oil circuit safety of the handheld double-tube single-connection electric hydraulic pump after miniaturization, but also further simplifies the structure of the oil circuit, further simplifies the volume of the electric hydraulic pump, and at the same time, the simplification of the oil circuit further improves safety. The integration of the oil outlet pipe 43 and the oil return pipe 44 in the oil pipe interface 42 greatly facilitates the connection between the electric hydraulic pump and the external working head, and the operation is very simple and convenient.

[0032] In this embodiment, if Figures 6 to 10As shown, the pressure relief block 51 has an oil inlet hole 511, an oil return hole 512, a first pressure regulating oil hole 513, a first oil groove 514, a second pressure regulating oil hole 515 and a second oil groove 516. The oil inlet hole 511 is connected to the oil outlet hole of the pump oil assembly 3, and the oil return hole 512 is connected to the oil bag. The regulating valve 53 is arranged between the oil inlet hole 511 and the first pressure regulating oil hole 513. The first oil groove 514 is connected to the first pressure regulating oil hole 513 and the second pressure regulating oil hole 515. The second oil groove 516 is connected to the second pressure regulating oil hole 515 and the oil return hole 512. The pressure relief switch 53 connects or blocks the pressure relief oil circuit between the oil inlet hole 511 and the oil return hole 512. The regulating valve 53 regulates or blocks the pressure regulating oil circuit composed of the oil inlet hole 511, the first pressure regulating oil hole 513, the first oil groove 514, the second pressure regulating oil hole 515, the second oil groove 516 and the oil return hole 512.

[0033] In this embodiment, the oil outlet connection seat 41 includes a pump body connection seat 411 and an oil pipe connection seat 412 which are sealed and connected. The pump body connection seat 411 is connected to the oil pump assembly 3, and the oil pipe connection seat 412 is connected to the oil pipe joint 42. The oil pipe connection seat 412 has an oil outlet channel 4121 and an oil return channel 4122 which are connected to the oil outlet pipe 43 and the oil return pipe 44 respectively. The oil pump assembly 3 is a three-plunger pump having three oil outlet holes. The pump body connection seat 411 has a strip oil groove 4111 which axially penetrates the pump body connection seat 411. The strip oil groove 4111 is connected to the three oil outlet holes on the oil pump assembly 3, and the oil pumped out of the three oil outlet holes is collected and input into the oil outlet channel 4121 of the oil pipe connection seat. The oil inlet hole 511 on the pressure relief block 51 is connected to the strip oil groove 4111. However, the present invention does not make any limitation to this.

[0034] The following will be combined Figures 6 to 9 The pressure regulation and pressure relief principles of the handheld double-tube single-connection electric hydraulic pump provided in this embodiment are described in detail.

[0035] During normal operation, the pressure relief switch 52 blocks the oil inlet hole 511 and the oil return hole 512, and the pressure relief oil circuit is blocked. The oil output from the three oil outlet holes on the oil pump assembly 3 is collected into the strip oil groove 4111 on the pump body connection seat 411, and is output to the oil outlet channel 4121 of the pipe connection seat through the strip oil groove 4111, and then enters the oil outlet pipe 43 and is output to the rodless cavity of the external working head, pushing the external working head to move, and at the same time squeezing the oil in the rod cavity of the external working head into the oil return pipe 44. In this process, if the oil pressure in the strip oil groove 4111 exceeds the pressure of the regulating valve 53 in the pressure regulating oil circuit, the oil pushes open the regulating valve 53 through the oil inlet hole 511, and the regulating valve 53 opens the pressure regulating oil circuit, and the oil is discharged through the oil inlet hole 511→regulating valve 53→first pressure regulating oil hole 513→first oil groove 514→second pressure regulating oil hole 515→second oil groove 516→oil return hole 512 (e.g. Figure 6 and Figure 7The oil pressure in the strip oil groove 4111 is maintained within the oil pressure range set by the regulating valve 53, thereby ensuring the oil pressure safety during the working process and avoiding leakage caused by excessive oil pressure.

[0036] After the external working head is finished, the operator triggers the pressure relief switch 52 to connect the oil inlet hole 511 and the oil return hole 512 on the pressure relief block 51. At this time, the oil pump assembly 3 outputs the oil collected in the strip oil groove 4111 directly into the oil return hole 512 through the oil inlet hole 511 for oil return (such as Figure 8 and Fig. 9 As shown by the middle arrow, the oil no longer enters the oil outlet channel 4121 and the oil outlet pipe 43. At the same time, under the action of the reset spring in the external working head, the oil in the rodless chamber of the external working head is compressed back to the oil outlet pipe 43 → oil outlet channel 4121 → strip oil groove 4111 → oil inlet hole 511 → oil return hole 512, and the oil is quickly returned, and the push rod in the external working head is quickly reset. At this time, the space in the rod chamber increases, the pressure decreases, and the oil in the oil bag will be sucked back into the rod chamber through the oil return pipe 44.

[0037] In this embodiment, the arrangement of the strip oil groove 4111 in the pump body connection seat 411 makes the oil pressure section between the pump body connection seat 411 and the oil pipe connection seat 412 very small, and the oil is not easy to leak, which greatly improves the safety of oil transportation. Since the oil pump component 3 is a multi-plunger pump, such as a three-plunger pump or a plungerless pump, the oil pump component 3 has multiple oil outlet holes; as in this embodiment, the oil pump component 3 is a three-plunger pump, which has three oil outlet holes. In order to communicate with multiple oil outlet holes, the strip oil groove 4111 is composed of two oil groove sub-segments, and the strip oil groove between two adjacent oil outlet holes is an oil groove sub-segment, and the cross-sectional center line of the oil groove sub-segment is a straight line or an arc. Specifically, the oil pump assembly has three oil outlet holes evenly distributed along the circumferential direction, the second oil outlet hole and the third oil outlet hole are close to the pressure relief and pressure regulating assembly 5, the cross-sectional midline of the oil groove sub-segment 4111a connecting the first oil outlet hole and the second oil outlet hole is a straight line, and the cross-sectional midline of the oil groove sub-segment 4111b connecting the second oil outlet hole and the third oil outlet hole is an arc line, which is convex to the side where the pressure relief and pressure regulating assembly 5 is located, and the two oil groove sub-segments form a sickle-shaped strip oil groove. However, the present invention does not impose any limitation on the cross-sectional shape of the strip oil groove.

[0038] In the design of the strip oil groove 4111, in order to reduce the oil pressure cross section between the pump body connection seat 411 and the oil pipe connection seat 412 as much as possible, the length of the oil groove sub-segment will be as short as possible. Therefore, in this embodiment, the center line of the oil groove sub-segment 4111a is a straight line connecting the first oil outlet hole and the second oil outlet hole; the design of the oil groove sub-segment 4111b needs to take into account the interference of the space matching the pump body connection seat 411 and the oil pipe connection seat 412 (such as the interference with the groove 4113), so it is designed as an arc and the arc protrudes toward the pressure relief and pressure regulating assembly 5. This setting reduces the oil path entering the pressure relief and pressure regulating assembly 5.

[0039] like Fig.11 and Fig.12 As shown, the surface where the pump body connection seat 411 contacts the oil pipe connection seat 412 has a flow guide groove 4112 passing through the strip oil groove 4111, and the flow guide groove 4112 is connected to the oil outlet channel 4121 on the oil pipe connection seat. The oil output from the strip oil groove 4111 is guided by the flow guide groove 4112 and enters the oil outlet channel 4121. In addition, the oil pipe connection seat has an extension section 4123 formed in the circumference of the oil return channel 4122 and protruding from the surface of the oil pipe connection seat.

[0040] The pump body connection seat 411 has a groove 4113 matched with the extension section, and the extension section 4123 extends into the groove 4113 of the pump body connection seat. The extension section 4123 guides the return oil into the groove 4113 for oil return, and also prevents the return oil from leaking from the contact surface between the pump body connection seat 411 and the oil pipe connection seat 412.

[0041] During operation, since the oil pressure in the strip oil groove 4111 is relatively high, in order to further improve safety, in this embodiment, Figure 5 and Fig.12 As shown, the surface of the oil pipe connection seat 412 in contact with the pump body connection seat 411 is provided with an axial sealing groove 4124 located outside the oil outlet channel 4121 and the oil return channel 4122, and the first sealing ring 413 in the axial sealing groove 4124 seals the contact surface of the oil pipe connection seat 412 and the pump body connection seat 411. Further, a radial sealing groove 4125 is provided on the extension section 4123, and the second sealing ring 414 arranged in the radial sealing groove 4125 seals the extension section 4123 and the groove 4113 matched therewith. The first sealing ring 413 and the second sealing ring 414 are provided to seal and connect the two contact surfaces of the pump body connection seat 411 and the oil pipe connection seat 412 at the same time; even if the oil pressure in the strip oil groove 4111 is very high, the two contact surfaces of the pump body connection seat 411 and the oil pipe connection seat 412 will not be deformed, and the oil will not leak, thereby further improving safety.

[0042] In summary, in the handheld double-tube single-connection electric hydraulic pump provided by the present invention, the drive assembly, the oil pump assembly and the oil outlet assembly are connected in sequence along the axial direction. This arrangement allows the handheld double-tube single-connection electric hydraulic pump to extend axially as a whole, greatly reducing the volume of the electric hydraulic pump. The oil outlet pipe and the oil return pipe on the oil outlet assembly are integrated in the same oil pipe interface to achieve the effect of double-tube single connection, which not only greatly facilitates the connection between the electric hydraulic pump and the working head, but also further realizes the miniaturization of the electric hydraulic pump. The pressure relief and pressure regulating assembly integrates manual pressure relief and automatic pressure relief. This arrangement can well ensure the miniaturization of the electric hydraulic pump while having good safety.

[0043] Although the present invention has been disclosed as above by the preferred embodiment, it is not intended to limit the present invention. Anyone familiar with this technology can make slight changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope of protection required by the claims.

Claims

1. A handheld double-tube single-connection electric hydraulic pump, characterized in that: It includes a handheld seat, a driving assembly, an oil bag, an oil pump assembly, an oil outlet assembly and a pressure relief assembly. The driving assembly, the oil pump assembly and the oil outlet assembly are sequentially connected along the axial direction, wherein: The oil outlet assembly comprises an oil outlet connection seat, an oil pipe interface, and an oil outlet pipe and an oil return pipe arranged in the oil pipe interface, the oil pipe interface is connected to the oil pump assembly via the oil outlet seat, and the oil outlet pipe and the oil return pipe are respectively connected to the oil outlet hole and the oil bag of the oil pump assembly via the oil outlet connection seat; A pressure relief and pressure regulating assembly, comprising a pressure relief block, a pressure relief switch and a regulating valve, wherein the pressure relief block is arranged on an oil outlet connection seat, and is provided with a pressure relief oil circuit and a pressure regulating oil circuit respectively connected to the oil outlet hole of the oil pump assembly and the oil bag, and the pressure relief switch opens or closes the pressure relief oil circuit; the regulating valve is arranged in the pressure regulating oil circuit, and when the pressure relief oil circuit is closed, it regulates the oil pressure output from the oil outlet hole of the oil pump assembly to the oil outlet pipe; wherein the pressure relief block is provided with an oil inlet hole, an oil return hole, a first pressure regulating oil hole, a first oil groove, a second pressure regulating oil hole and a second oil groove, the oil inlet hole is connected to the oil outlet hole of the oil pump assembly, the oil return hole is connected to the oil bag, the regulating valve is arranged between the oil inlet hole and the first pressure regulating oil hole, the first oil groove is connected to the first pressure regulating oil hole and the second pressure regulating oil hole, and the second oil groove is connected to the second pressure regulating oil hole and the oil return hole; The pressure relief switch connects or blocks the pressure relief oil path between the oil inlet hole and the oil return hole; The regulating valve regulates or blocks the pressure regulating oil circuit composed of the oil inlet hole, the first pressure regulating oil hole, the first oil groove, the second pressure regulating oil hole, the second oil groove and the oil return hole.

2. The handheld double-tube single-connection electric hydraulic pump according to claim 1, characterized in that: The oil outlet connection seat comprises a pump body connection seat and an oil pipe connection seat which are sealed and connected. The pump body connection seat is connected to the oil pump assembly, and the oil pipe connection seat is connected to the oil pipe joint. The oil pipe connection seat has an oil outlet channel and an oil return channel which are connected to the oil outlet pipe and the oil return pipe respectively.

3. The handheld double-tube single-connection electric hydraulic pump according to claim 2, characterized in that: The oil pump assembly is provided with a plurality of oil outlet holes, and the pump body connecting seat is provided with a strip-shaped oil groove which penetrates the pump body connecting seat axially. The strip-shaped oil groove is connected to the plurality of oil outlet holes on the oil pump assembly, and the oil pumped out of the plurality of oil outlet holes is collected and input into the oil outlet channel of the oil pipe connecting seat, and the pressure regulating oil circuit is connected to the strip-shaped oil groove.

4. The handheld double-tube single-connection electric hydraulic pump according to claim 3, characterized in that: The strip oil groove is composed of a plurality of oil groove sub-segments, and the strip oil groove between two adjacent oil outlet holes is an oil groove sub-segment, and the center line of the cross section of the oil groove sub-segment is a straight line or an arc.

5. The handheld double-tube single-connection electric hydraulic pump according to claim 4, characterized in that: The oil pump assembly has three oil outlet holes evenly distributed along the circumferential direction, the second oil outlet hole and the third oil outlet hole are close to the pressure relief and pressure regulating assembly, the cross-sectional midline of the oil groove sub-segment connecting the first oil outlet hole and the second oil outlet hole is a straight line, and the cross-sectional midline of the oil groove sub-segment connecting the second oil outlet hole and the third oil outlet hole is an arc line, which protrudes toward the side where the pressure relief and pressure regulating assembly is located, and the two oil groove sub-segments form a sickle-shaped strip oil groove.

6. The handheld double-tube single-connection electric hydraulic pump according to claim 3, characterized in that: The surface where the pump body connection seat contacts the oil pipe connection seat is provided with a guide groove passing through the strip oil groove, the guide groove is connected to the oil outlet channel on the oil pipe connection seat and guides the oil output from the strip oil groove into the oil outlet channel.

7. The handheld double-tube single-connection electric hydraulic pump according to claim 2 or 6, characterized in that: The oil pipe connection seat has an extension section formed in the circumference of the oil return channel and protruding from the surface of the oil pipe connection seat, the pump body connection seat has a groove matching the extension section, and the extension section of the oil return channel extends into the groove of the pump body connection seat.

8. The handheld double-tube single-connection electric hydraulic pump according to claim 7, characterized in that: The contact surface between the oil pipe connection seat and the pump body connection seat is provided with an axial sealing groove located outside the oil outlet channel and the oil return channel, and the sealing ring in the axial sealing groove seals the contact surface between the oil pipe connection seat and the pump body connection seat.

9. The handheld double-tube single-connection electric hydraulic pump according to claim 8, characterized in that: A radial sealing groove is provided on the extension section of the oil return channel, and a sealing ring arranged in the radial sealing groove seals the extension section and a groove matched therewith.

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