CN111561435A - Handheld double-pipe single-connection electric hydraulic pump - Google Patents

Abstract

The invention provides a handheld double-pipe single-connection electric hydraulic pump which comprises a handheld base, 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 sequentially connected along the axial direction. The oil outlet assembly comprises an oil outlet connecting seat, an oil pipe interface, an oil outlet pipe and an oil return pipe, wherein the oil outlet pipe and the oil return pipe are 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 communicated with an oil outlet hole and an oil bag of the oil pumping assembly through the oil outlet connecting seat. The pressure relief and pressure regulation assembly comprises a pressure relief block, a pressure relief switch and a regulating valve, the pressure relief block is arranged on the oil outlet connecting seat, the pressure relief block is provided with a pressure relief oil path and a pressure regulation oil path which are respectively communicated with an oil outlet of the oil pumping assembly and the oil bag, and the pressure relief oil path is opened or closed by the pressure relief switch; the regulating valve is arranged in the pressure regulating oil way, and the oil pressure output from the oil outlet hole of the oil pumping assembly to the oil outlet pipe is regulated when the pressure releasing oil way is closed.

Description

Handheld double-pipe single-connection electric hydraulic pump

technical field

The invention relates to the field of hydraulic technology, in particular to a hand-held double-pipe single-connection electric hydraulic pump.

Background technique

In various rescue scenes, rescue teams and police will use special rescue tools to break down metal or non-metal structures to rescue victims trapped in dangerous environments. The electric hydraulic pump that provides the power source in these rescue tools is one of the indispensable and important tools. At present, the electric hydraulic pump on the market is very bulky and heavy, which is not only very difficult to carry, but also greatly limits its working area. in the gap.

In addition, the oil circuit of the existing electric hydraulic pump is very complicated. The complexity of the oil circuit not only makes the volume of the electric hydraulic pump large, but also the more complicated the oil circuit, the higher the risk of leakage and the worse the safety performance.

SUMMARY OF THE INVENTION

In order to overcome the deficiencies of the prior art, the present invention provides a hand-held double-pipe single-connection electric hydraulic pump.

In order to achieve the above purpose, the present invention provides a hand-held double-pipe single-connection electric hydraulic pump, which includes a hand-held base, a drive assembly, an oil bag, a pump oil assembly, an oil outlet assembly, and a pressure relief assembly. The drive assembly, the pump oil 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 pump oil assembly through the oil outlet seat, and the oil outlet pipe and the oil return pipe are respectively connected to the pump oil through the oil outlet connection seat. Oil outlet holes and oil pockets of components. 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, and the pressure relief block is provided with a relief oil circuit and a pressure relief oil circuit respectively connecting the oil outlet hole of the pump oil assembly and the oil bag. In the pressure regulating oil circuit, 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, the oil pressure output from the oil outlet of the pump oil assembly to the oil outlet pipe is adjusted.

According to an embodiment of the present invention, the pressure relief block has 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, and the oil inlet hole communicates with the pump oil assembly The oil outlet hole, the oil return hole is connected with 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 with the first pressure regulating oil hole and the second pressure regulating oil hole, and the second oil groove Connect the second pressure regulating oil hole and the oil return hole;

The pressure relief switch connects or blocks the pressure relief oil circuit 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.

According to an embodiment of the present invention, the oil outlet connection seat includes a pump body connection seat and an oil pipe connection seat which are sealedly connected, the pump body connection seat is connected to the pump oil assembly, the oil pipe connection seat is connected to the oil pipe joint, and the oil pipe connection seat has a The oil outlet and return passages of the oil outlet pipe and the oil return pipe.

According to an embodiment of the present invention, the pump oil assembly has a plurality of oil outlet holes, the pump body connecting seat has a strip-shaped oil groove extending through the pump body connecting seat in the axial direction, and the strip-shaped oil groove communicates with the plurality of oil outlet holes on the pump oil assembly. The oil hole collects the oil pumped from the multiple oil outlet holes and inputs it into the oil outlet channel of the oil pipe connection seat, and the pressure regulating oil circuit is connected to the strip-shaped oil groove.

According to an embodiment of the present invention, the strip-shaped oil groove is composed of multiple oil groove sub-sections, the strip-shaped oil groove between two adjacent oil outlet holes is an oil groove sub-section, and the cross-sectional center line of the oil groove sub-section is a straight line or an arc.

According to an embodiment of the present invention, the pump oil 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, and communicate with the first oil outlet hole and the The cross-sectional center line of the oil groove sub-section of the second oil outlet is a straight line, and the cross-sectional center line of the oil groove sub-section connecting the second oil outlet and the third oil outlet is an arc. One side of the oil groove is raised, and the two oil groove sub-sections form a sickle-shaped strip oil groove.

According to an embodiment of the present invention, the surface of the pump body connecting seat in contact with the oil pipe connecting seat has a guide groove passing through the strip-shaped oil groove, and the guide groove communicates with the oil outlet channel on the oil pipe connecting seat and connects the strip-shaped oil groove. The oil output from the oil tank is led into the oil outlet channel.

According to an embodiment of the present invention, the oil pipe connection seat has an extension section formed in the circumferential direction of the oil return passage and protruding from the surface of the oil pipe connection seat, and the pump body connection seat has a groove matched with the extension section, The extended section of the oil return passage extends into the groove of the pump body connecting seat.

According to an embodiment of the present invention, the surface of the oil pipe connection seat in contact with the pump body connection 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 oil pipe connection seat The contact surface with the pump body connection seat.

According to an embodiment of the present invention, a radial sealing groove is formed on the extending section of the oil return passage, and the sealing ring disposed in the radial sealing groove seals the extending section and the groove matched with it.

To sum up, in the hand-held double-pipe single-connection electric hydraulic pump provided by the present invention, the driving component, the pump oil component and the oil outlet component are connected in sequence along the axial direction. Axial extension greatly reduces the volume of the electric hydraulic pump. On the oil outlet assembly, the oil outlet pipe and the oil return pipe are integrated in the same oil pipe interface to realize the effect of double-pipe single connection, which not only greatly facilitates the connection between the electric hydraulic pump and the working head, but also further realizes the electric hydraulic pump. miniaturization. The pressure relief and pressure regulating component integrates manual pressure relief and automatic pressure relief. This setting can ensure the miniaturization of the electric hydraulic pump and good safety.

In order to make the above-mentioned and other objects, features and advantages of the present invention more obvious and easy to understand, the preferred embodiments are hereinafter described in detail together with the accompanying drawings.

Description of drawings

FIG. 1 is a schematic structural diagram of a hand-held double-pipe single-connection electric hydraulic pump according to an embodiment of the present invention.

FIG. 2 and FIG. 3 are schematic structural diagrams of FIG. 1 from another viewing angle.

FIG. 4 is a schematic cross-sectional view of FIG. 2 .

FIG. 5 is an enlarged schematic view of A in FIG. 4 .

FIG. 6 is a schematic cross-sectional view through the oil inlet hole and the first pressure regulating oil hole in FIG. 3 during automatic pressure relief.

FIG. 7 is a schematic cross-sectional view through the second pressure regulating oil hole and the oil return hole in FIG. 3 during automatic pressure relief.

Figure 8 shows the schematic diagram of the assembly of the pressure relief switch and the pressure relief block during manual pressure relief.

FIG. 9 is a schematic cross-sectional view through the second pressure regulating oil hole and the oil return hole in FIG. 3 when the pressure is released manually.

Figure 10 shows a schematic diagram of the structure of the pressure relief block.

Figure 11 is a schematic diagram of the structure of the pump body connection seat.

Figure 12 is a schematic diagram of the structure of the oil pipe connection seat.

Detailed ways

As shown in FIGS. 1 to 3 , the hand-held double-tube single-connection electric hydraulic pump provided in this embodiment includes a hand-held base 1 , a drive assembly 2 , an oil bag (not shown in the figure due to the viewing angle), and pump oil Component 3, oil outlet component 4 and pressure relief and pressure regulating component 5. The drive assembly 2 , the pump oil 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 41 to the pump oil assembly 3 through the oil outlet seat. The oil pipe 44 is respectively connected to the oil outlet hole and the oil bag of the pump oil 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 connection seat 41, and the pressure relief block 51 has an oil outlet hole and The pressure relief oil circuit and the pressure regulating oil circuit of 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, when the pressure relief switch 52 closes the pressure relief oil circuit, it adjusts the slave pump The oil assembly 3 outputs the oil pressure to the oil outlet pipe 43 .

The drive assembly 2 , the pump oil assembly 3 and the oil outlet assembly 4 in the hand-held double-pipe 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 components 5 integrating automatic pressure regulation and manual pressure relief not only ensures the safety of the oil circuit of the miniaturized hand-held double-pipe single-connection electric hydraulic pump, but also further simplifies the structure of the oil circuit. The volume of the electric hydraulic pump is further simplified, and the simplification of the oil circuit further improves the safety. The oil outlet pipe 43 and the oil return pipe 44 are integrated into the oil pipe interface 42, which greatly facilitates the connection between the electric hydraulic pump and the external working head, and the operation is very simple and convenient.

In this embodiment, as shown in FIGS. 6 to 10 , 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 , and a second pressure regulating oil hole. 515 and the second oil groove 516, the oil inlet hole 511 is connected to the oil outlet hole of the pump oil assembly 3, 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, An oil groove 514 communicates with the first pressure regulating oil hole 513 and the second pressure regulating oil hole 515 , and the second oil groove 516 communicates with the second pressure regulating oil hole 515 and the oil return hole 512 . The pressure relief switch 53 communicates or blocks the pressure relief oil passage between the oil inlet hole 511 and the oil return hole 512 . The regulating valve 53 regulates or blocks the pressure regulating oil circuit formed by 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 .

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 pump oil assembly 3, and the oil pipe connection seat 412 is connected to the oil pipe joint 42. The oil pipe connection The seat 412 has an oil outlet passage 4121 and an oil return passage 4122 that communicate with the oil outlet pipe 43 and the oil return pipe 44 respectively. The pump oil assembly 3 is a three-plunger pump with three oil outlet holes. The pump body connecting seat 411 has a strip-shaped oil groove 4111 extending through the pump body connecting seat 411 in the axial direction. The strip-shaped oil groove 4111 communicates with the pump oil assembly 3 The three oil outlet holes on the upper part of the pump collect the oil pumped out of the three oil outlet holes and input them into the oil outlet channel 4121 of the oil pipe connection seat. The oil inlet hole 511 on the pressure relief block 51 communicates with the strip-shaped oil groove 4111 . However, the present invention is not limited to this.

The principle of pressure regulation and pressure relief of the hand-held double-pipe single-connection electric hydraulic pump provided in this embodiment will be described in detail below with reference to FIGS. 6 to 9 .

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 pump oil assembly 3 is collected into the strip-shaped oil groove 4111 on the pump body connecting seat 411, and is output to the oil outlet channel 4121 of the pipe connecting seat through the strip-shaped oil groove 4111, and then enters the oil outlet pipe 43 The output is sent to the rodless cavity of the outer working head, and the outer working head is pushed to move, and the oil in the rod cavity of the outer working head is squeezed into the oil return pipe 44 at the same time. During this process, if the oil pressure in the strip-shaped oil groove 4111 exceeds the pressure of the regulating valve 53 in the pressure regulating oil circuit, the oil will push the regulating valve 53 through the oil inlet hole 511, and the regulating valve 53 will open the pressure regulating oil circuit , the oil is discharged through the oil inlet hole 511 → regulating valve 53 → the first pressure regulating oil hole 513 → the first oil groove 514 → the second pressure regulating oil hole 515 → the second oil groove 516 → the oil return hole 512 (as shown in Figure 6). and shown by the arrow in Figure 7), to ensure that the oil pressure in the strip oil groove 4111 is maintained within the oil pressure range set by the regulating valve 53, so as to ensure the safety of the oil pressure during the working process, and avoid the oil pressure caused by excessive oil pressure. leaks, etc.

After the operation of the external working head is completed, the operator triggers the pressure relief switch 52 to make the pressure relief switch 52 communicate with the oil inlet hole 511 and the oil return hole 512 on the pressure relief block 51 . At this time, the oil output from the pump oil assembly 3 and collected in the strip-shaped oil groove 4111 directly enters the oil return hole 512 through the oil inlet hole 511 for oil return (as shown by the arrows in Figures 8 and 9), and the oil no longer enters Inside the oil outlet channel 4121 and the oil outlet pipe 43 . At the same time, under the action of the return spring in the outer working head, the oil in the rodless cavity of the outer 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, perform quick oil return, and the push rod in the external working head is quickly reset. At this time, the space in the cavity with the rod increases, the pressure decreases, and the oil in the oil bag will be sucked back into the cavity with the rod through the oil return pipe 44 .

In this embodiment, in the pump body connecting seat 411, the strip-shaped oil groove 4111 is arranged so that the oil pressure section between the pump body connecting seat 411 and the oil pipe connecting seat 412 is very small, the oil is not easy to leak, and the oil transportation is greatly improved. time security. Since the pump oil assembly 3 is a multi-piston pump, such as a three-piston pump or a non-piston pump, the pump oil assembly 3 has a plurality of oil outlet holes; in this embodiment, the pump oil assembly 3 is a three-piston pump, which There are three oil outlet holes on it. In order to communicate with multiple oil outlet holes, the strip-shaped oil groove 4111 is composed of two oil groove sub-sections, the strip-shaped oil groove between two adjacent oil outlet holes is an oil groove sub-section, and the cross-sectional center line of the oil groove sub-section is a straight line or arc. Specifically, the pump oil assembly has three oil outlet holes evenly distributed in 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, and communicate with the first oil outlet hole and the second oil outlet hole. The cross-sectional center line of the oil groove sub-section 4111a of the oil hole is a straight line, and the cross-sectional center line of the oil groove sub-section 4111b connecting the second oil outlet hole and the third oil outlet hole is an arc line. One side of the oil groove is raised, and the two oil groove sub-sections form a sickle-shaped strip oil groove. However, the present invention does not impose any limitation on the cross-sectional shape of the strip-shaped oil groove.

In the design of the strip-shaped oil groove 4111, in order to reduce the hydraulic cross section between the pump body connecting seat 411 and the oil pipe connecting seat 412 as much as possible, the length of the oil groove sub-section is as short as possible. Therefore, in this embodiment, the center line of the oil groove sub-section 4111a is a straight line connecting the first oil outlet hole and the second oil outlet hole; the design of the oil groove sub-section 4111b needs to take into account the matching between the pump body connecting seat 411 and the oil pipe connecting seat 412. Therefore, it is designed as an arc and the arc protrudes toward the pressure relief and pressure regulating assembly 5 , which reduces the oil path entering the pressure relief and pressure regulating assembly 5 .

As shown in FIG. 11 and FIG. 12 , the surface of the pump body connecting seat 411 in contact with the oil pipe connecting seat 412 has a guide groove 4112 passing through the strip-shaped oil groove 4111, and the guide groove 4112 is connected to the outlet on the oil pipe connecting seat. Oil passage 4121. The oil output from the strip-shaped oil groove 4111 is guided by the guide groove 4112 and then enters the oil outlet channel 4121 . In addition, the oil pipe connection seat has an extension section 4123 formed in the circumferential direction of the oil return channel 4122 and protruding from the surface of the oil pipe connection seat.

The pump body connecting seat 411 has a groove 4113 matched with the extension section, and the extending section 4123 extends into the groove 4113 of the pump body connecting seat. The extended section 4123 guides the returned oil into the groove 4113 for oil return, which also prevents the return oil from leaking from the contact surface of the pump body connecting seat 411 and the oil pipe connecting seat 412 .

During operation, since the oil pressure in the strip-shaped oil groove 4111 is relatively large, in order to further improve the safety, in this embodiment, as shown in FIG. 5 and FIG. 12 , the oil pipe connection seat 412 is in contact with the pump body connection seat 411 There is an axial sealing groove 4124 on the outside of 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 between the oil pipe connection seat 412 and the pump body connection seat 411. Further, a radial sealing groove 4125 is formed on the extending section 4123, and the second sealing ring 414 disposed in the radial sealing groove 4125 seals the extending section 4123 and the groove 4113 matched with it. The arrangement of the first sealing ring 413 and the second sealing ring 414 seals and connects the two contact surfaces of the pump body connecting seat 411 and the oil pipe connecting seat 412 at the same time; even if the oil pressure in the strip-shaped oil groove 4111 is high, the pump body connecting seat 411 The two contact surfaces with the oil pipe connection seat 412 will not be deformed, and the oil will not leak, which further improves the safety.

To sum up, in the hand-held double-pipe single-connection electric hydraulic pump provided by the present invention, the driving component, the pump oil component and the oil outlet component are connected in sequence along the axial direction. Axial extension greatly reduces the volume of the electric hydraulic pump. On the oil outlet assembly, the oil outlet pipe and the oil return pipe are integrated in the same oil pipe interface to realize the effect of double-pipe single connection, which not only greatly facilitates the connection between the electric hydraulic pump and the working head, but also further realizes the electric hydraulic pump. miniaturization. The pressure relief and pressure regulating component integrates manual pressure relief and automatic pressure relief. This setting can ensure the miniaturization of the electric hydraulic pump and good safety.

Although the present invention has been disclosed above by preferred embodiments, it is not intended to limit the present invention. Anyone who is familiar with the art can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection shall be subject to the scope of protection required by the claims.

Claims (10)

1. a hand-held double-pipe single-connection electric hydraulic pump, is characterized in that, comprises hand-held seat, drive assembly, oil bag, pump oil assembly, oil outlet assembly and pressure relief assembly, drive assembly, pump oil assembly and oil outlet assembly Connected in sequence in the axial direction, where: 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 pump oil assembly through the oil outlet seat, and the oil outlet pipe and the oil return pipe are respectively connected to the pump through the oil outlet connection seat. Oil outlet holes and oil bags of oil components; 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, and the pressure relief block is provided with a pressure relief oil circuit respectively connecting the oil outlet hole of the pump oil assembly and the oil bag. And the pressure regulating oil circuit, the pressure relief switch opens or closes the pressure relief oil circuit; the regulating valve is set 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 pump oil assembly to the oil outlet pipe . 2. The hand-held double-pipe single-connection electric hydraulic pump according to claim 1, wherein the pressure relief block has an oil inlet hole, an oil return hole, a first pressure regulating oil hole, a first oil groove, a Two pressure regulating oil holes and a second oil groove, the oil inlet hole is connected with the oil outlet hole of the pump oil assembly, the oil return hole is connected with the oil bag, the regulating valve is arranged between the oil inlet hole and the first pressure regulating oil hole, and the first oil groove is connected with the first pressure regulating oil hole and the second pressure regulating oil hole, and the second oil groove is connected with the second pressure regulating oil hole and the oil return hole; The pressure relief switch connects or blocks the pressure relief oil circuit 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. 3. The hand-held double-pipe single-connection electric hydraulic pump according to claim 1, wherein the oil outlet connection seat comprises a pump body connection seat and an oil pipe connection seat that are sealed and connected, and the pump body connection seat is connected to the pump oil The oil pipe connection seat is connected to the oil pipe joint, and the oil pipe connection seat is provided with an oil outlet channel and an oil return channel respectively communicating with the oil outlet pipe and the oil return pipe. 4. The hand-held double-pipe single-connection electric hydraulic pump according to claim 3, wherein the pump oil assembly has a plurality of oil outlet holes, and the pump body connecting seat has a bar extending through the pump body connecting seat in the axial direction. The strip-shaped oil groove is connected to the multiple oil outlet holes on the pump oil assembly. The oil pumped from the multiple oil outlet holes is collected and input into the oil outlet channel of the oil pipe connection seat, and the pressure regulating oil circuit is connected to the strip-shaped oil groove. . 5. The hand-held double-pipe single-connection electric hydraulic pump according to claim 3, wherein the strip-shaped oil groove is composed of multi-section oil groove sub-sections, and the strip-shaped oil groove between two adjacent oil outlet holes is a Oil tank sub-section, the cross-sectional center line of the oil tank sub-section is a straight line or an arc. 6. The hand-held double-pipe single-connection electric hydraulic pump according to claim 5, wherein the pump oil assembly has three oil outlet holes evenly distributed along the circumferential direction, the second oil outlet hole and the third oil outlet The hole is close to the pressure relief and pressure regulating assembly, the center line of the cross section of the oil groove subsection connecting the first oil outlet hole and the second oil outlet hole is straight, and the cross section of the oil groove subsection connecting the second oil outlet hole and the third oil outlet hole is a straight line. The center line is an arc, and the arc protrudes to the side where the pressure relief and pressure regulating components are located, and the two oil groove sub-sections form a sickle-shaped strip oil groove. 7. The hand-held double-pipe single-connection electric hydraulic pump according to claim 4, characterized in that, the surface where the pump body connecting seat is in contact with the oil pipe connecting seat has a diversion groove passing through a strip-shaped oil groove, and the diversion groove is formed. The groove communicates with the oil outlet channel on the oil pipe connecting seat, and guides the oil output from the strip-shaped oil groove into the oil outlet channel. 8. The hand-held double-pipe single-connection electric hydraulic pump according to claim 3 or 7, wherein the oil pipe connection seat has an extension section formed in the circumferential direction of the oil return passage and protruding from the surface of the oil pipe connection seat, The pump body connecting seat is provided with a groove matched with the extending section, and the extending section of the oil return passage extends into the groove of the pump body connecting seat. 9 . The hand-held double-pipe single-connection electric hydraulic pump according to claim 8 , wherein the surface of the oil pipe connection seat in contact with the pump body connection seat has an axial direction located outside the oil outlet channel and the oil return channel. 10 . The sealing groove, the sealing ring in the axial sealing groove seals the contact surface between the oil pipe connection seat and the pump body connection seat. 10 . The hand-held double-pipe single-connection electric hydraulic pump according to claim 9 , wherein a radial sealing groove is provided on the extended section of the oil return channel, and the sealing ring disposed in the radial sealing groove seals the extended section. 11 . and its matching groove.

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