Liquid-cooled wire with enhanced heat exchange

Abstract

The utility model discloses a liquid-cooled wire for enhanced heat exchange, comprising an insulating sheath and a single-strand conductor, wherein the single-strand conductor is nested inside the insulating sheath, a gap between the outer wall of the single-strand conductor and the inner wall of the insulating sheath forms a first flow channel, the single-strand conductor is hollowly arranged to form a second flow channel, an external spiral groove is formed on the outer wall of the single-strand conductor, a sheath female connector is formed at one end of the insulating sheath, a sheath male connector is formed at the other end corresponding to the insulating sheath, a conductor female connector is formed at one end of the single-strand conductor, a conductor male connector is formed at the other end corresponding to the single-strand conductor, the sheath female connector can be adapted and connected with the sheath male connector of the adjacent insulating sheath, and the conductor female connector can be adapted and connected with the conductor male connector of the adjacent single-strand conductor. The liquid-cooled wire of the utility model is conducive to improving the heat dissipation effect of the conductor, is conducive to giving full play to the current carrying capacity of the conductor, and is conducive to allowing the total length of the liquid-cooled wire to be flexibly set according to actual application conditions.

Description

Technical Field

[0001] The utility model relates to the field of conductors used for high-power charging, and in particular to a liquid-cooled conductor with enhanced heat exchange. Background Art

[0002] The current liquid-cooled conductors simply introduce traditional cables into independent circulation pipes to cool the conductors through indirect heat exchange, or directly place the conductors in plastic pipes and circulate the cooling medium to cool them down. The multiple strands of conductors are in a divergent state inside the pipe, which increases the flow resistance and even makes it impossible to ensure flow. As a result, dead zones appear in the channel, causing poor heat dissipation of the conductors and local overheating, making it impossible to fully exert their current-carrying capacity. Therefore, it is necessary to improve the liquid-cooled conductors in the prior art. Summary of the invention

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a liquid-cooled conductor with enhanced heat exchange, which is beneficial to improving the heat dissipation effect of the conductor, thereby facilitating full utilization of the current-carrying capacity of the conductor.

[0004] The purpose of the utility model is achieved through the following technical solutions.

[0005] The utility model discloses a liquid-cooled wire with enhanced heat exchange, comprising an insulating sheath and a single-strand conductor, wherein the single-strand conductor is nested inside the insulating sheath, a gap between an outer wall of the single-strand conductor and an inner wall of the insulating sheath forms a first flow channel, the single-strand conductor is hollowly arranged to form a second flow channel, an external spiral groove is formed on the outer wall of the single-strand conductor, a sheath female connector is formed at one end of the insulating sheath, a sheath male connector is formed at the other corresponding end of the insulating sheath, a conductor female connector is formed at one end of the single-strand conductor, a conductor male connector is formed at the other corresponding end of the single-strand conductor, the sheath female connector can be adaptably connected to the sheath male connector of an adjacent insulating sheath, and the conductor female connector can be adaptably connected to the conductor male connector of an adjacent single-strand conductor.

[0006] Preferably, the conductor female connector is formed with an internal thread, and the conductor male connector is formed with an external thread.

[0007] Preferably, at least two external spiral grooves are formed on the outer wall of the single-strand conductor.

[0008] Preferably, the cross section of the external spiral groove is arc-shaped.

[0009] Preferably, an inner spiral groove is formed on the inner wall of the single-strand conductor.

[0010] Preferably, the cross-section of the internal spiral groove is triangular.

[0011] Preferably, the liquid-cooling wire of the present invention also includes a male conductive terminal, which is provided with a first pipe joint and a male liquid infusion connection part, and the male liquid infusion connection part includes a first terminal male joint and a second terminal male joint, the first terminal male joint is adapted to be connected with the corresponding internal thread, and the second terminal male joint is inserted into the corresponding sheath female joint, and a bypass and a first liquid passage are formed in the male conductive terminal, one end of the first liquid passage is connected to the second flow channel, and the other end corresponding to the first liquid passage is connected to the first pipe joint, one end of the bypass is connected to the first liquid passage, and the other end corresponding to the bypass is connected to the first flow channel.

[0012] Preferably, the liquid-cooling wire of the present invention also includes a female conductive terminal, which is provided with a second pipe joint and a female infusion connection portion, a second liquid passage is formed in the female infusion connection portion, one end of the second liquid passage is adapted to be connected with the corresponding external thread, the other corresponding end of the second liquid passage is connected to the second pipe joint, a liquid passage groove is formed on the inner wall of the second liquid passage, the first flow channel is connected to the second liquid passage through the liquid passage groove, and the female infusion connection portion is adapted to be inserted into the corresponding sheath male joint.

[0013] Compared with the prior art, the utility model has the following beneficial effects: a liquid-cooled wire is provided including an insulating sheath and a single-strand conductor, the single-strand conductor is nested inside the insulating sheath, a first flow channel is formed by a gap between an outer wall of the single-strand conductor and an inner wall of the insulating sheath, a second flow channel is formed by a hollow arrangement of the single-strand conductor, and an external spiral groove is formed on the outer wall of the single-strand conductor, which is beneficial to improving the heat dissipation effect of the conductor, thereby facilitating full utilization of the current-carrying capacity of the conductor; a sheath female connector is formed at one end of the insulating sheath, a sheath male connector is formed at the other end corresponding to the insulating sheath, a conductor female connector is formed at one end of the single-strand conductor, and a conductor male connector is formed at the other end corresponding to the single-strand conductor, the sheath female connector can be adapted and connected with the sheath male connector of an adjacent insulating sheath, and the conductor female connector can be adapted and connected with the conductor male connector of an adjacent single-strand conductor, so that the liquid-cooled wire is easy to manufacture, and the total length of the liquid-cooled wire can be flexibly set according to actual application conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic cross-sectional structural diagram of the liquid-cooled wire monomer of the present utility model.

[0015] Figure 2 for Figure 1 Schematic diagram of the local structure at point A.

[0016] Figure 3 for Figure 1 Schematic diagram of the local structure at location B.

[0017] Figure 4This is a schematic diagram of the first cooling medium flow of the liquid-cooled wire monomer of the utility model.

[0018] Figure 5 This is a schematic diagram of the circulation of the second cooling medium of the liquid-cooled wire monomer of the utility model.

[0019] Figure 6 This is a schematic diagram of the circulation of a third cooling medium of the liquid-cooled wire monomer of the present invention.

[0020] Figure 7 This is a schematic diagram of the fourth cooling medium flow of the liquid-cooled wire monomer of the present invention.

[0021] Figure 8 It is a schematic diagram of the three-dimensional structure of the liquid-cooled wire of the utility model.

[0022] Fig. 9 It is a schematic cross-sectional structure diagram of the liquid-cooled wire of the present utility model.

[0023] Fig.10 for Fig. 9 Schematic diagram of the local structure at location C.

[0024] Fig.11 for Fig. 9 Schematic diagram of the local structure at D.

[0025] Fig.12 It is a three-dimensional structural schematic diagram of the female conductive terminal of the utility model.

[0026] Explanation of reference numerals: insulating sheath 1; sheath female connector 11; sheath male connector 12; single-strand conductor 2; conductor female connector 21; internal thread 2101; conductor male connector 22; external thread 2201; external spiral groove 201; internal spiral groove 202; reducer 23; first flow channel 31; second flow channel 32; male conductive terminal 4; first pipe joint 401; first mounting hole 402; male infusion connection portion 403; first terminal male connector 4031; second terminal male connector 4032; axial shoulder 4033; bypass 4034; first liquid passage 404; female conductive terminal 5; second pipe joint 501; second mounting hole 502; female infusion connection portion 503; liquid passage groove 5031; second liquid passage 504; internal cooling medium flow 90; first external cooling medium flow 91; second external cooling medium flow 92. DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with the accompanying drawings.

[0028] The liquid-cooled wire with enhanced heat exchange of the utility model is as follows: Figure 1As shown, it includes an insulating sheath 1 and a single-strand conductor 2, and the single-strand conductor 2 is nested inside the insulating sheath 1. In other words, there is only one single-strand conductor 2 in the insulating sheath 1, and the single-strand conductor 2 can be made of materials such as silver, copper or aluminum. Figures 1 to 3 As shown, the gap between the outer wall of the single-strand conductor 2 and the inner wall of the insulating sheath 1 forms a first flow channel 31, and the single-strand conductor 2 is hollow to form a second flow channel 32, that is, the hollow structure inside the single-strand conductor 2 serves as the second flow channel 32, and the second flow channel 32 and the outer shape of the single-strand conductor 2 are preferably coaxially arranged. An external spiral groove 201 is formed on the outer wall of the single-strand conductor 2, and an annular support member can be arranged between the outer wall of the single-strand conductor 2 and the inner wall of the insulating sheath 1, so that the single-strand conductor 2 and the insulating sheath 1 are coaxially arranged. The above-mentioned annular support member is circumferentially distributed to form a plurality of liquid holes to avoid the annular support member from significantly affecting the flow of the cooling medium; and because the single-strand conductor 2 is formed with the external spiral groove 201, even if the above-mentioned annular support member is not provided and the outer wall of the single-strand conductor 2 is unilaterally attached to the inner wall of the insulating sheath 1, the cooling medium can still pass through the external spiral groove 201 at the contact portion between the single-strand conductor 2 and the insulating sheath 1. As shown Figures 1 to 3 As shown, a sheath female connector 11 is formed at one end of the insulating sheath 1, and a sheath male connector 12 is formed at the other end of the insulating sheath 1. A conductor female connector 21 is formed at one end of the single-strand conductor 2, and a conductor male connector 22 is formed at the other end of the single-strand conductor 2. Figure 8 and Fig. 9 As shown, the sheath female connector 11 can be adapted and connected with the sheath male connector 12 of the adjacent insulating sheath 1, and the conductor female connector 21 can be adapted and connected with the conductor male connector 22 of the adjacent single-strand conductor 2, so that an insulating sheath 1 and a single-strand conductor 2 are combined into a liquid-cooled wire monomer, and several liquid-cooled wire monomers can be connected end to end to extend the total length of the liquid-cooled wire. In other words, the length of the liquid-cooled wire monomer can be set shorter, which is convenient for the processing and manufacturing of the single-strand conductor 2.

[0029] like Figure 4 As shown, a portion of the cooling medium can be input into the first flow channel 31 from between the sheath female connector 11 and the conductor female connector 21, and at the same time, another portion of the cooling medium can be input into the second flow channel 32 from the conductor female connector 21, and the cooling medium then flows from left to right to the sheath male connector 12 and the conductor male connector 22, as shown in FIG. Fig. 9 As shown, if the liquid-cooled wire is formed by splicing a plurality of liquid-cooled wire monomers, the cooling medium can flow directly from the first flow channel 31 of one liquid-cooled wire monomer to the first flow channel 31 of an adjacent liquid-cooled wire monomer, and the cooling medium can also flow directly from the second flow channel 32 of one liquid-cooled wire monomer to the second flow channel 32 of an adjacent liquid-cooled wire monomer.

[0030] Since the cooling medium directly contacts the inner and outer wall surfaces of the single-strand conductor 2 at the same time, heat accumulation is avoided inside the single-strand conductor 2, which is conducive to the rapid transfer of heat generated by the single-strand conductor 2 when it is energized to the cooling medium; since the outer wall of the single-strand conductor 2 is formed with an external spiral groove 201, it is conducive to increasing the contact area between the outer wall of the single-strand conductor 2 and the cooling medium, which is conducive to improving the heat exchange efficiency, and the cooling medium flows along the external spiral groove 201 around the outer side of the single-strand conductor 2 in a spiral, which is conducive to the orderly flow of the cooling medium in the first flow channel 31, avoiding the occurrence of a flow dead zone, so that the single-strand conductor 2 (circumferentially) is effectively contacted with the cooling medium at all locations, which can avoid the cooling medium in the horizontally arranged single-strand conductor 2 due to gravity. The upper part of the single-strand conductor 2 cannot be effectively cooled, further improving the heat exchange efficiency, and further improving the heat dissipation effect of the conductor, so as to give full play to the current carrying capacity of the conductor. Since there is only one single-strand conductor 2 in the insulating sheath 1, the flow channel structure is relatively simplified, which is conducive to the orderly flow of the cooling medium and avoids the cooling medium flowing between multiple conductors and being significantly hindered.

[0031] Furthermore, if Figure 2 As shown, the conductor female connector 21 is formed with an internal thread 2101. Figure 3 As shown, the conductor male connector 22 is formed with an external thread 2201. Fig. 9 As shown, when the liquid-cooled wire monomers are spliced, the internal thread 2101 is threadedly connected with the adjacent external thread 2201, so that the single-strand conductor 2 can be spliced ​​with a simple structure, and the threaded connection structure has a certain sealing effect, which prevents the cooling medium in the second flow channel 32 from leaking into the first flow channel 31, thereby avoiding obvious turbulence at the splicing position between the liquid-cooled wire monomers. Fig. 9 As shown, the sheath female connector 11 can be adapted to fit outside the adjacent sheath male connector 12, and the sheath female connector 11 and the sheath male connector 12 can be sealed by glue. More specifically, the outer diameter of the sheath male connector 12 is set to be the same as the outer diameter of the insulating sheath 1 body, and the inner diameter of the sheath male connector 12 is larger than the outer diameter of the conductor female connector 21, so that the adjacent first flow channels 31 can be connected, as shown in FIG. Figure 3 As shown, a reducing tube portion 23 is formed between the single-strand conductor 2 body and the conductor male connector 22 .

[0032] Furthermore, if Figure 2As shown, at least two external spiral grooves 201 are formed on the outer wall of the single-strand conductor 2, that is, the number of the external spiral grooves 201 is two or more, and the external spiral grooves 201 and the external spiral grooves 201 are parallel to each other, so that the first flow channel 31 is divided into a plurality of branches. The purpose of increasing the number of the external spiral grooves 201 is to increase the lead of the external spiral grooves 201 to avoid the flow path of the cooling medium being too long and affecting the circulation period of the cooling medium, but the external spiral grooves 201 can fully cover the outer wall of the single-strand conductor 2, which is beneficial to increase the contact area between the cooling medium and the outer wall of the single-strand conductor 2.

[0033] like Figure 5 As shown, for example, two external spiral grooves 201 are formed on the outer wall of the single-strand conductor 2, so that the first external cooling medium flow 91 and the second external cooling medium flow 92 are respectively formed in the corresponding external spiral grooves 201, and the first external cooling medium flow 91 and the second external cooling medium flow 92 can flow from the sheath female connector 11 to the sheath male connector 12, and the internal cooling medium flow 90 formed in the second flow channel 32 can flow from the conductor male connector 22 to the conductor female connector 21 (or as Figure 4 , the inner cooling medium flow 90 may flow from the conductor female connector 21 to the conductor male connector 22). Figure 6 As shown, the first outer cooling medium flow 91 and the second outer cooling medium flow 92 may flow from the sheath female connector 11 to the sheath male connector 12, and the first outer cooling medium flow 91 and the second outer cooling medium flow 92 converge and return to flow into the conductor male connector 22 after flowing out to the sheath male connector 12, thereby forming the inner cooling medium flow 90. Figure 7 As shown, the internal cooling medium flow 90 may flow from the conductor female connector 21 to the conductor male connector 22. After flowing out to the conductor male connector 22, the internal cooling medium flow 90 is separated into two branches and becomes the first external cooling medium flow 91 and the second external cooling medium flow 92 from the sheath male connector 12 to the sheath female connector 11 respectively.

[0034] Furthermore, if Figure 2 As shown, the cross-section of the external spiral groove 201 is in an arc shape, thereby preventing the cooling medium from flowing at sharp corners and generating obvious turbulence, so that the flow of the cooling medium is subject to less resistance, so that the gap between the inner wall of the insulating sheath 1 and the outer wall of the single-strand conductor 2 can be set smaller, and will not cause too much impact on the flow of the cooling medium, which makes the outer diameter of the liquid-cooled wire of the utility model can be set relatively small.

[0035] Furthermore, if Figure 2As shown, an internal spiral groove 202 is formed on the inner wall of the single-strand conductor 2, which is beneficial to increase the contact area between the inner wall of the single-strand conductor 2 and the cooling medium, and is beneficial to improving the heat exchange efficiency. Moreover, the cooling medium located at the inner wall of the single-strand conductor 2 can flow along the internal spiral groove 202, thereby avoiding the cooling medium from forming a flow boundary layer at the inner wall of the single-strand conductor 2, thereby helping to improve the heat exchange effect.

[0036] Furthermore, if Figure 2 As shown, the cross-section of the internal spiral groove 202 is triangular. Since the single-strand conductor 2 is hollow, and in order to make the single-strand conductor 2 have sufficient cross-sectional area for current to pass through, the outer diameter of the single-strand conductor 2 is significantly larger than the outer diameter of the solid conductor in the prior art. Therefore, the second flow channel 32 is easy to be set with a larger diameter. Therefore, setting the cross-section of the internal spiral groove 202 in a triangular shape will not cause a significant negative impact on the flow of the cooling medium, but it can help to make the structure of the internal spiral groove 202 simple and easy to manufacture.

[0037] Furthermore, if Figures 8 to 10 As shown, the liquid-cooled wire of the utility model also includes a male conductive terminal 4, the main body of the male conductive terminal 4 is a plate-shaped structure, a first mounting hole 402 is formed on the male conductive terminal 4, the male conductive terminal 4 is provided with a first pipe joint 401 and a male infusion connection part 403, a hose for conveying a cooling medium can be sleeved outside the first pipe joint 401, the male infusion connection part 403 includes a first terminal male joint 4031 and a second terminal male joint 4032, the first terminal male joint 4031 is coaxially connected with the corresponding internal thread 2101, and the second terminal male joint 4032 is plugged into the corresponding sheath female joint 11, as shown in FIG. Fig.10 As shown, that is, the outer diameter of the second terminal male connector 4032 is greater than the outer diameter of the first terminal male connector 4031, so an axial shoulder 4033 is formed between the second terminal male connector 4032 and the first terminal male connector 4031, and a bypass 4034 and a first liquid channel 404 are formed in the male conductive terminal 4, one end of the first liquid channel 404 is connected to the second flow channel 32, so the first liquid channel 404 can be arranged coaxially with the first terminal male connector 4031, one end of the first liquid channel 404 passes through the end face of the first terminal male connector 4031, and the other corresponding end of the first liquid channel 404 is connected to the first pipe connector 401, one end of the bypass 4034 is connected to the first liquid channel 404, and the other corresponding end of the bypass 4034 is connected to the first flow channel 31. For example, the above-mentioned corresponding other end of the bypass 4034 can pass through the axial shoulder 4033, and the four bypasses 4034 are evenly distributed circumferentially around the axis of the first terminal male connector 4031. For example, Fig.10As shown by the dotted arrow in the figure, the cooling medium can be input into the first pipe joint 401, and the cooling medium then reaches the first liquid channel 404. A part of the cooling medium is input into the second flow channel 32 along the axial direction of the first terminal male joint 4031, and another part of the cooling medium flows into between the inner wall of the sheath female joint 11 and the outer wall of the conductor female joint 21 through the bypass 4034, and then the cooling medium flows into the first flow channel 31; the above-mentioned male conductive terminal 4 can make one end of the liquid-cooled cable electrically connected to the corresponding electrical equipment, and also has the function of connecting the cooling medium.

[0038] Furthermore, if Figure 8 and Fig. 9 As shown, the liquid-cooled wire of the present invention further includes a female conductive terminal 5, and a second mounting hole 502 is formed on the female conductive terminal 5. Fig.11 As shown, the female conductive terminal 5 is provided with a second pipe joint 501 and a female infusion connection part 503, a second liquid passage 504 is formed in the female infusion connection part 503, the second liquid passage 504 is coaxially arranged with the outer wall of the female infusion connection part 503, one end of the second liquid passage 504 is coaxially connected with the corresponding external thread 2201, that is, one end of the second liquid passage 504 is threadedly sleeved on the outside of the corresponding conductor male connector 22, and the other end of the second liquid passage 504 is connected to the second pipe joint 501, as shown in FIG. Fig.12 As shown, the inner wall of the second liquid passage 504 is formed with liquid grooves 5031, which are evenly distributed in the circumference, that is, the liquid grooves 5031 cut the thread structure in the second liquid passage 504, and the first flow channel 31 is connected to the second liquid passage 504 through the liquid grooves 5031. The female infusion connection part 503 is adapted to be inserted into the corresponding sheath male connector 12, so that the female infusion connection part 503 can support the sheath male connector 12. Fig.11 As shown, the cooling medium is input into the liquid-cooled wire through the first pipe joint 401 of the male conductive terminal 4, and then the cooling medium of the first flow channel 31 reaches between the sheath male joint 12 and the conductor male joint 22, and the cooling medium of the first flow channel 31 can flow to the second liquid channel 504 through the liquid groove 5031, and the cooling medium of the second flow channel 32 can be directly output to the second liquid channel 504. After the cooling medium is gathered, it is discharged through the second pipe joint 501. The above-mentioned female conductive terminal 5 can make the corresponding end of the liquid-cooled cable electrically connected to the corresponding electrical equipment, and also has the function of connecting the cooling medium.

[0039] In summary, the liquid-cooled cable of the utility model has the following advantages:

[0040] (1) Strengthen the heat transfer of conductors and give full play to the current carrying capacity of conductors.

[0041] (2) Since the current carrying capacity of the liquid-cooled wire is improved, the outer diameter of the liquid-cooled wire can be relatively reduced compared with the existing technology, thereby achieving small wires to transmit large currents and reducing investment costs.

[0042] (3) The internal flow conditions of the liquid-cooled wire are improved to avoid the occurrence of flow dead zones that affect safety.

Claims

1. A liquid-cooled conductor with enhanced heat exchange, characterized in that: The invention comprises an insulating sheath (1) and a single-strand conductor (2), wherein the single-strand conductor (2) is embedded in the insulating sheath (1), a gap between the outer wall of the single-strand conductor (2) and the inner wall of the insulating sheath (1) forms a first flow channel (31), the single-strand conductor (2) is hollowly arranged to form a second flow channel (32), an outer spiral groove (201) is formed on the outer wall of the single-strand conductor (2), a sheath female connector (11) is formed at one end of the insulating sheath (1), and a sheath male connector (12) is formed at the other corresponding end of the insulating sheath (1), a conductor female connector (21) is formed at one end of the single-strand conductor (2), and a conductor male connector (22) is formed at the other corresponding end of the single-strand conductor (2), the sheath female connector (11) can be adapted to be connected to the sheath male connector (12) of the adjacent insulating sheath (1), and the conductor female connector (21) can be adapted to be connected to the conductor male connector (22) of the adjacent single-strand conductor (2).

2. The liquid-cooled wire with enhanced heat exchange according to claim 1, characterized in that: The conductor female connector (21) is formed with an internal thread (2101), and the conductor male connector (22) is formed with an external thread (2201).

3. The liquid-cooled wire with enhanced heat exchange according to claim 1, characterized in that: At least two external spiral grooves (201) are formed on the outer wall of the single-strand conductor (2).

4. The liquid-cooled wire with enhanced heat exchange according to claim 1, characterized in that: The cross section of the external spiral groove (201) is in an arc shape.

5. The liquid-cooled conductor with enhanced heat exchange according to claim 1, characterized in that: An internal spiral groove (202) is formed on the inner wall of the single-strand conductor (2).

6. The liquid-cooled wire with enhanced heat exchange according to claim 5, characterized in that: The cross section of the internal spiral groove (202) is triangular in shape.

7. The liquid-cooled wire with enhanced heat exchange according to claim 2, characterized in that: The invention also comprises a male conductive terminal (4), wherein the male conductive terminal (4) is provided with a first pipe joint (401) and a male liquid infusion connection part (403), wherein the male liquid infusion connection part (403) comprises a first terminal male joint (4031) and a second terminal male joint (4032), wherein the first terminal male joint (4031) is adapted to be connected to the corresponding internal thread (2101), and the second terminal male joint (4032) is inserted into the corresponding sheath female joint (11), and a bypass channel (4034) and a first liquid passage (404) are formed in the male conductive terminal (4), wherein one end of the first liquid passage (404) is connected to the second flow passage (32), and the other end of the first liquid passage (404) is connected to the first pipe joint (401), and one end of the bypass channel (4034) is connected to the first liquid passage (404), and the other end of the bypass channel (4034) is connected to the first flow passage (31).

8. The liquid-cooled conductor with enhanced heat exchange according to claim 7, characterized in that: It also comprises a female conductive terminal (5), the female conductive terminal (5) being provided with a second pipe joint (501) and a female infusion connection part (503), a second liquid passage (504) being formed in the female infusion connection part (503), one end of the second liquid passage (504) being adaptably connected to the corresponding external thread (2201), the other corresponding end of the second liquid passage (504) being connected to the second pipe joint (501), a liquid passage groove (5031) being formed on the inner wall of the second liquid passage (504), the first flow channel (31) being connected to the second liquid passage (504) via the liquid passage groove (5031), and the female infusion connection part (503) being adaptably inserted into the corresponding sheath male joint (12).

Images