A photovoltaic cable connector

Abstract

The utility model relates to photovoltaic cable technical field especially a kind of photovoltaic cable connector, including first cable connector, second cable connector, quick connector and conductive core, the first cable connector includes connector body, conductive fixing seat and sealing screw sleeve, the connector body is equipped with through hole, the sealing screw sleeve is threadedly connected with the connector body, the conductive fixing seat is located in the sealing screw sleeve, and with the inside of the through hole Fixed connection, the both ends of the quick connector are respectively connected with the first cable connector and the second cable connector, the conductive core is worn on the quick connector;A kind of photovoltaic cable connector disclosed in the present application is provided with the conductive fixing seat, without extra carrying wire clamp, simplifying wiring step;And through the abutment cooperation of the conductive fixing seat and the conductive core, the difficulty of disassembly of conductive core and cable caused by traditional wire pressing connection is avoided, while convenient maintenance replacement, reduce the loss of disassembly.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic cable technology, and in particular to a photovoltaic cable connector. Background Technology

[0002] Currently, photovoltaic (PV) power generation, as an important green energy source, has experienced rapid development in recent years. PV modules are the core module of a PV power generation system, and to maximize power output per unit area, module power ratings are constantly being updated and expanded. PV connectors are essential components in PV systems; PV modules are connected via mating connections to form a PV array and output high voltage. However, existing PV connectors require wire strippers to remove the cable sheath before crimping the cable to the conductive core, necessitating separate use of wire strippers and crimpers during field wiring, resulting in a relatively slow wiring process.

[0003] It is evident that existing technologies still need improvement and enhancement. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a photovoltaic cable connector to solve the problem that the existing photovoltaic cable connectors require wire stripping and crimping, which leads to slow wiring speed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A photovoltaic cable connector includes a first cable connector, a second cable connector, a quick-connect plug, and a conductive core. The first cable connector and the second cable connector have identical structures and are symmetrically arranged. The first cable connector includes a connector body, a conductive fixing seat, and a sealing screw sleeve. The connector body has a through hole. The sealing screw sleeve is threadedly connected to the connector body. The conductive fixing seat is disposed inside the sealing screw sleeve and is fixedly connected to the inner side of the through hole. The two ends of the quick-connect plug are respectively connected to the first cable connector and the second cable connector. The conductive core passes through the quick-connect plug, and the two ends of the conductive core pass through the through holes of the first cable connector and the second cable connector, respectively. The two ends of the conductive core abut against the conductive fixing seats inside the first cable connector and the second cable connector, respectively.

[0006] As described above, in a photovoltaic cable connector, the conductive fixing seat includes a conductive seat, a limiting ring, a threaded seat, a conductor tube, and a pressure seat. The conductive seat is fixed inside the communicating hole. The threaded seat is coaxially disposed on the side of the limiting ring facing the connector body. The conductor tube is disposed on the side of the threaded seat facing away from the limiting ring. One end of the conductor tube passes through the threaded seat and the limiting ring in sequence. The pressure seat is sleeved on the other end of the conductor tube. The threaded seat is threadedly connected to the end of the communicating hole away from the quick-connect plug. The conductive seat and the pressure seat clamp and fix the cable.

[0007] As described above, in a photovoltaic cable connector, the conductive base includes a retaining ring and a conical cover. The retaining ring is fixed inside the communicating hole, and the conical cover is located on the side of the retaining ring facing away from the quick-connect plug. The tip of the conical cover faces the conductor tube. The pressing base includes a frustum cover, which bends outward along the edge of the conductor tube. The conical cover and the frustum cover are used to clamp and fix the cable.

[0008] As described above, in a photovoltaic cable connector, the conical cover and the frustum cover are respectively provided with a plurality of first protruding rings on opposite sides.

[0009] As described above, in a photovoltaic cable connector, the limiting ring has two recesses on the side facing away from the threaded seat, and the two recesses are disposed opposite each other on the edge of the limiting ring.

[0010] As described above, in a photovoltaic cable connector, the sealing sleeve includes a screw sleeve, a rubber sealing sleeve, and an elastic sleeve. The screw sleeve is threadedly connected to the connector body. The inner bottom of the screw sleeve has a frustum groove, and the edge of the frustum groove facing the quick-connect plug has a snap-fit ​​groove. The rubber sealing sleeve and the elastic sleeve are both frustum shaped. The elastic sleeve snaps into the frustum groove. The front edge of the elastic sleeve has a first snap-fit ​​edge, which snaps into the snap-fit ​​groove. The rear circumference of the elastic sleeve has multiple slots, and the rubber sealing sleeve is inserted into the elastic sleeve. The edge of the rubber sealing sleeve near the quick-connect plug has a second snap-fit ​​edge that abuts against the first snap-fit ​​edge. The rubber sealing sleeve abuts against the limiting ring.

[0011] As described above, in a photovoltaic cable connector, the limiting ring has a first annular groove on the side facing the rubber sealing sleeve, and the rubber sealing sleeve has a second convex ring. The second convex ring and the first annular groove are engaged, and the second convex ring and the rubber sealing sleeve are integrally formed.

[0012] As described above, a photovoltaic cable connector includes a male socket body, a female socket body, two slots, two clearance grooves, two hooks, a second annular groove, a convex ring seat, two third annular grooves, and two sealing rings. The male socket body connects to the second cable connector, and the female socket body connects to the first cable connector. The male socket body has a first through hole communicating with the connecting hole of the second cable connector, and the female socket body has a second through hole communicating with the connecting hole of the first cable connector. The conductive core passes through the first through hole and the second through hole. The two slots are respectively located at both ends of the male socket body facing the female socket body, and the two clearance grooves are respectively located on the periphery of the male socket body. At both ends of the side, the two clearance grooves and the two slots correspond one-to-one and are connected. The two hooks are respectively provided at both ends of the female socket body on the side away from the first cable connector. The two hooks and the two slots correspond one-to-one and are engaged. The second annular groove is provided on the side of the male socket body facing the female socket body. The second annular groove is coaxially provided on the outside of the first through hole. The convex ring seat is provided on the side of the female socket body facing the male socket body. The convex ring seat is coaxially provided on the outside of the second through hole. The convex ring seat is inserted into the second annular groove. The two third annular grooves are adjacent to each other on the outer periphery of the convex ring seat. The two sealing rings correspond one-to-one with the two third annular grooves and are engaged.

[0013] Beneficial effects: This utility model discloses a photovoltaic cable connector, including a first cable connector, a second cable connector, a quick-connect plug, and a conductive core. The first cable connector and the second cable connector have identical structures and are symmetrically arranged. The first cable connector includes a connector body, a conductive fixing seat, and a sealing screw sleeve. The connector body has a through hole. During the assembly of the cable with the photovoltaic cable connector, the outer sheath of the cable is first stripped with wire strippers. After the cable passes through the sealing screw sleeve, it is connected and fixed to the conductive fixing seat. Rotating the sealing screw sleeve tightens the sealing screw sleeve and the connector body, thus achieving the sealing... The sealing connection between the sealing sleeve and the cable is achieved by connecting and fixing the first cable connector and the second cable connector via the quick-connect plug after the cable connection is completed. Both ends of the conductive core pass through the connecting hole and abut against the conductive fixing seat, thus completing the mechanical and electrical connection of the photovoltaic cable. The photovoltaic cable connector disclosed in this application, with the conductive fixing seat, eliminates the need for additional crimping pliers, simplifying the wiring steps. Furthermore, the abutting cooperation between the conductive fixing seat and the conductive core avoids the difficulty of disassembling and assembling the conductive core and cable caused by traditional crimping connections, facilitating maintenance and replacement while reducing disassembly and assembly losses. Attached Figure Description

[0014] Figure 1This utility model provides a structural schematic diagram of a photovoltaic cable connector and cable assembly. Figure 2 A cross-sectional view of the photovoltaic cable connector and cable assembly provided by this utility model; Figure 3 Exploded view of the photovoltaic cable connector provided by this utility model; Figure 4 Another exploded view of the photovoltaic cable connector provided by this utility model; Reference numerals: 1-First cable connector, 11-Connector body, 12-Conductive fixing seat, 121-Conductive seat, 122-Limiting ring, 123-Threaded seat, 124-Wire cylinder, 125-Pressure seat, 126-Fixing ring, 127-Conical cover, 128-First convex ring, 129-Recess, 120-First annular groove, 13-Sealing threaded sleeve, 131-Threaded sleeve, 132-Rubber sealing sleeve, 133-Elastic sleeve. 134-Frustum groove, 135-Snap-fit ​​groove, 136-First snap-fit ​​edge, 137-Slot, 138-Second snap-fit ​​edge, 139-Second convex ring, 14-Connecting hole, 2-Second cable connector, 3-Quick connector, 31-Male socket body, 32-Female socket body, 33-Slot, 34-Allowing groove, 35-Hook, 36-Second annular groove, 37-Convex ring seat, 38-Third annular groove, 39-Sealing ring, 4-Conductive core. Detailed Implementation

[0015] This utility model provides a photovoltaic cable connector. To make the purpose, technical solution and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and embodiments.

[0016] In the description of this utility model, it should be understood that the terms "top" and other terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and should not be construed as limiting this utility model; in addition, the terms "installation" and "connection" should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0017] like Figure 1-4As shown in the figure, this application proposes a photovoltaic cable connector, including a first cable connector 1, a second cable connector 2, a quick-connect plug 3, and a conductive core 4. The first cable connector 1 and the second cable connector 2 have the same structure and are symmetrically arranged. The first cable connector 1 includes a connector body 11, a conductive fixing seat 12, and a sealing screw sleeve 13. The connector body 11 has a through hole 14. The sealing screw sleeve 13 is threadedly connected to the connector body 11. The conductive fixing seat 12 is disposed in the sealing screw sleeve 13 and is fixedly connected to the inner side of the through hole 14. The two ends of the quick-connect plug 3 are respectively connected to the first cable connector 1 and the second cable connector 2. The conductive core 4 is disposed on the quick-connect plug 3. The two ends of the conductive core 4 pass through the through hole 14 of the first cable connector 1 and the second cable connector 2, respectively. The two ends of the conductive core 4 abut against the conductive fixing seat 12 in the first cable connector 1 and the second cable connector 2, respectively.

[0018] This utility model discloses a photovoltaic cable connector, including a first cable connector 1, a second cable connector 2, a quick-connect plug 3, and a conductive core 4. The first cable connector 1 and the second cable connector 2 have identical structures and are symmetrically arranged. The first cable connector 1 includes a connector body 11, a conductive fixing seat 12, and a sealing screw sleeve 13. The connector body 11 has a through hole 14. During the assembly of the cable with the photovoltaic cable connector, the outer sheath of the cable is first stripped with wire strippers. After the cable passes through the sealing screw sleeve 13, it is connected and fixed to the conductive fixing seat 12. Rotating the sealing screw sleeve 13 tightens the sealing screw sleeve 13 and the connector body 11. The sealing screw sleeve 13 achieves a sealed connection with the cable. After the first cable connector 1 and the second cable connector 2 are both connected and fixed by the quick-connect plug 3, both ends of the conductive core 4 pass through the connecting hole 14 and abut against the conductive fixing seat 12, thus completing the mechanical and electrical connection of the photovoltaic cable. The photovoltaic cable connector disclosed in this application, with the conductive fixing seat 12, eliminates the need to carry additional crimping pliers, simplifying the wiring steps. Furthermore, the abutting cooperation between the conductive fixing seat 12 and the conductive core 4 avoids the difficulty of disassembling and assembling the conductive core and cable caused by traditional crimping connections, facilitating maintenance and replacement while reducing disassembly and assembly losses.

[0019] The conductive fixing base 12 includes a conductive base 121, a limiting ring 122, a threaded base 123, a wire tube 124, and a pressing base 125. The conductive base 121 is fixed inside the communicating hole 14. The threaded base 123 is coaxially disposed on the side of the limiting ring 122 facing the connector body 11. The wire tube 124 is disposed on the side of the threaded base 123 facing away from the limiting ring 122. One end of the wire tube 124 passes through the threaded base 123 and the limiting ring 122 in sequence. The pressing base 125 is sleeved on the other end of the wire tube 124. The threaded base 123 is threadedly connected to the end of the communicating hole 14 away from the quick-connect plug 3. The conductive seat 121 and the pressing seat 125 clamp and fix the cable. After the cable passes through the conductor tube 124, it presses against the conductive seat 121. Due to the loss of the cable sheath, the cable spreads outward. Rotating the threaded seat 123 causes it to extend into the connecting hole 14, while simultaneously moving the conductor tube 124 and the pressing seat 125. The conductor tube 124 provides support for the pressing seat 125. The pressing seat 125 and the conductive seat 121 clamp the cable, realizing the fixation of the cable and the connection of the circuit. The limiting ring 122 is provided for hand gripping and rotation, while limiting the movement of the threaded seat 123 to prevent the threaded seat 123 from being over-screwed.

[0020] The conductive base 121 includes a fixing ring 126 and a conical cover 127. The fixing ring 126 is fixed inside the communicating hole 14. The conical cover 127 is located on the side of the fixing ring 126 facing away from the quick connector 3, with the tip of the conical cover 127 facing the wire tube 124. The pressing base 125 includes a frustum cover, which bends outward along the edge of the wire tube 124. The conical cover 127 and the frustum cover are used to clamp and fix the cable. The conical cover 127 is inserted into the middle of the cable, guiding the cable to spread outward. The cable is clamped by the cooperation of the conical cover 127 and the frustum cover. Since the inclination angle of the conical cover 127 and the frustum cover is small, it ensures a stable clamping while preventing the cable from breaking due to excessive bending.

[0021] The conical cover 127 and the frustum cover are respectively provided with a plurality of first protruding rings 128 on opposite sides. The squeezing action of each first protruding ring 128 makes the contact between the cable and the conical cover 127 or the frustum cover more compact, preventing the cable from detaching from the conductive fixing seat 12.

[0022] The limiting ring 122 has two recesses 129 on the side opposite to the threaded seat 123. The two recesses 129 are arranged opposite each other on the edge of the limiting ring 122, which can be used to place tools or hands, making it convenient for operators to rotate the limiting ring 122.

[0023] The sealing sleeve 13 includes a screw sleeve 131, a rubber sealing sleeve 132, and an elastic sleeve 133. The screw sleeve 131 is threadedly connected to the connector body 11. The inner bottom of the screw sleeve 131 is provided with a frustum groove 134. The edge of the frustum groove 134 facing the quick connector 3 is provided with a snap-fit ​​groove 135. The rubber sealing sleeve 132 and the elastic sleeve 133 are both frustum shaped. The elastic sleeve 133 snaps into the frustum groove 134. The front edge of the elastic sleeve 133 is provided with a first snap-fit ​​edge 136, which snaps into the snap-fit ​​groove 135. The rear circumference of the elastic sleeve 133 is provided with multiple slots 137. The rubber sealing sleeve 132 is inserted into the elastic sleeve 133. The edge of the rubber sealing sleeve 132 near the quick connector 3 is provided with a second snap-fit ​​edge 138 that abuts against the first snap-fit ​​edge 136. The sleeve 132 abuts against the limiting ring 122. When the threaded sleeve 131 and the connector body 11 are tightened, both the rubber sealing sleeve 132 and the elastic sleeve 133 are compressed, the gap between each of the slots 137 becomes smaller, the rear end of the elastic sleeve 133 narrows and presses against the rubber sealing sleeve 132, the rear end of the rubber sealing sleeve 132 wraps around the outer periphery of the cable, and the front end of the rubber sealing sleeve 132 presses against the limiting ring 122, thereby achieving a seal between the first cable connector 1 or the second cable connector 2 and the cable connection end. In addition, the sequential locking of the second snap-fit ​​edge 138, the first snap-fit ​​edge 136, and the snap-fit ​​groove 135 restricts the movement of the rubber sealing sleeve 132 and the elastic sleeve 133, preventing the rubber sealing sleeve 132 and the elastic sleeve 133 from being squeezed and sliding out of the threaded sleeve 131, and forming a bending gap, further improving the sealing effect.

[0024] The limiting ring 122 has a first annular groove 120 on the side facing the rubber sealing sleeve 132, and the rubber sealing sleeve 132 has a second convex ring 139. The second convex ring 139 and the first annular groove 120 are engaged. The second convex ring 139 and the rubber sealing sleeve 132 are integrally formed. Through the engagement of the second convex ring 139 and the first annular groove 120, a bending gap is formed, which further provides a sealing effect.

[0025] The quick-connect plug 3 includes a male socket body 31, a female socket body 32, two slots 33, two clearance slots 34, two hooks 35, a second annular groove 36, a convex ring seat 37, two third annular grooves 38, and two sealing rings 39. The male socket body 31 is connected to the second cable connector 2, and the female socket body 32 is connected to the first cable connector 1. The male socket body 31 has a first through hole communicating with the communicating hole 14 of the second cable connector 2, and the female socket body 32 has a connecting hole communicating with the first cable connector 1. The conductive core 4 passes through the first and second through holes, and the second through hole is connected to the first through hole 14. Two slots 33 are respectively located at both ends of the male socket body 31 facing the female socket body 32. Two clearance grooves 34 are respectively located at both ends of the outer periphery of the male socket body 31. The two clearance grooves 34 and the two slots 33 correspond one-to-one and are connected. Two hooks 35 are respectively located at both ends of the female socket body 32 facing away from the first cable connector 1. The two hooks 35 and the two slots 33... Each part corresponds to and engages with the other part of the male socket body 31. The second annular groove 36 is located on the side of the male socket body 31 facing the female socket body 32, and is coaxially located on the outside of the first through hole. The convex ring seat 37 is located on the side of the female socket body 32 facing the male socket body 31, and is coaxially located on the outside of the second through hole. The convex ring seat 37 is inserted into the second annular groove 36. Two third annular grooves 38 are adjacent to each other on the outer periphery of the convex ring seat 37. Two sealing rings 39 are connected to two... The third annular grooves 38 correspond one-to-one and engage with each other. The hooks 35 pass through the slots 33 and engage with the edge of the slots 33, realizing the quick connection of the male socket body 31 and the female socket body 32. When it is necessary to separate the male socket body 31 and the female socket body 32, the hooks 35 can be pressed by the relief grooves 34 to disengage them from the engagement with the edge of the slots 33. In addition, the double sealing structure formed by the insertion and engagement of the convex ring seat 37 and the second annular groove 36, as well as the sealing ring, provides a better sealing effect.

[0026] In this embodiment of the application, the conductive base 121 can be pre-placed on the mold before the connector body 11 is injection molded to ensure the stability of the connection between the conductive base 121 and the connector body 11; the male socket body 31 and the second cable connector 2 are integrally formed structures, and the female socket body 32 and the first cable connector 1 are integrally formed structures.

[0027] The above description provides one or more embodiments in conjunction with specific content, and does not imply that the specific implementation of this application is limited to these descriptions. Any methods or structures that are similar to or identical to those of this application, or any technical deductions or substitutions made based on the concept of this application, should be considered within the scope of protection of this application.

Claims

1. A photovoltaic cable connector, characterized in that, The cable includes a first cable connector (1), a second cable connector (2), a quick-connect plug (3), and a conductive core (4). The first cable connector (1) and the second cable connector (2) have the same structure and are symmetrically arranged. The first cable connector (1) includes a connector body (11), a conductive fixing seat (12), and a sealing screw sleeve (13). The connector body (11) has a through hole (14). The sealing screw sleeve (13) is threadedly connected to the connector body (11). The conductive fixing seat (12) is located on the sealing screw sleeve (14). 3) Inside, and fixedly connected to the inner side of the connecting hole (14), the two ends of the quick connector (3) are respectively connected to the first cable connector (1) and the second cable connector (2), the conductive core (4) is inserted on the quick connector (3), the two ends of the conductive core (4) pass through the connecting hole (14) of the first cable connector (1) and the second cable connector (2), and the two ends of the conductive core (4) abut against the conductive fixing seat (12) inside the first cable connector (1) and the second cable connector (2).

2. A photovoltaic cable connector according to claim 1, characterized in that, The conductive fixing seat (12) includes a conductive seat (121), a limiting ring (122), a threaded seat (123), a wire tube (124), and a pressing seat (125). The conductive seat (121) is fixed in the communicating hole (14). The threaded seat (123) is coaxially disposed on the side of the limiting ring (122) facing the connector body (11). The wire tube (124) is disposed on the side of the threaded seat (123) facing away from the limiting ring (122). One end of the wire tube (124) is sequentially inserted into the threaded seat (123) and the limiting ring (122). The pressing seat (125) is sleeved on the other end of the wire tube (124). The threaded seat (123) is threadedly connected to the end of the communicating hole (14) away from the quick connector (3). The conductive seat (121) and the pressing seat (125) clamp and fix the cable.

3. A photovoltaic cable connector according to claim 2, characterized in that, The conductive base (121) includes a fixing ring (126) and a conical cover (127). The fixing ring (126) is fixed in the communicating hole (14). The conical cover (127) is located on the side of the fixing ring (126) facing away from the quick connector (3). The tip of the conical cover (127) is positioned towards the wire tube (124). The pressure base (125) includes a frustum cover. The frustum cover bends and extends outward along the edge of the wire tube (124). The conical cover (127) and the frustum cover are used to clamp and fix the cable.

4. A photovoltaic cable connector according to claim 3, characterized in that, The conical cover (127) and the frustum cover are respectively provided with a plurality of first protruding rings (128) on opposite sides.

5. A photovoltaic cable connector according to claim 2, characterized in that, The limiting ring (122) has two recesses (129) on the side opposite to the threaded seat (123), and the two recesses (129) are disposed opposite each other on the edge of the limiting ring (122).

6. A photovoltaic cable connector according to claim 2, characterized in that, The sealing sleeve (13) includes a screw sleeve (131), a rubber sealing sleeve (132), and an elastic sleeve (133). The screw sleeve (131) is threadedly connected to the connector body (11). The inner bottom of the screw sleeve (131) is provided with a frustum groove (134). The edge of the frustum groove (134) facing the quick connector (3) is provided with a snap-fit ​​groove (135). The rubber sealing sleeve (132) and the elastic sleeve (133) are both frustum shaped. The elastic sleeve (133) is snapped onto the frustum groove (134). (133) The front edge is provided with a first snap-fit ​​edge (136), the first snap-fit ​​edge (136) and the snap-fit ​​groove (135) snap-fit ​​together. The elastic sleeve (133) has multiple slots (137) on the rear circumference. The rubber sealing sleeve (132) is inserted into the elastic sleeve (133). The edge of the rubber sealing sleeve (132) near the quick connector (3) is provided with a second snap-fit ​​edge (138) that abuts against the first snap-fit ​​edge (136). The rubber sealing sleeve (132) abuts against the limiting ring (122).

7. A photovoltaic cable connector according to claim 6, characterized in that, The limiting ring (122) has a first annular groove (120) on the side facing the rubber sealing sleeve (132), and the rubber sealing sleeve (132) has a second convex ring (139). The second convex ring (139) and the first annular groove (120) are engaged. The second convex ring (139) and the rubber sealing sleeve (132) are integrally formed.

8. A photovoltaic cable connector according to claim 1, characterized in that, The quick-connect plug (3) includes a male socket body (31), a female socket body (32), two slots (33), two clearance grooves (34), two hooks (35), a second annular groove (36), a convex ring seat (37), two third annular grooves (38), and two sealing rings (39). The male socket body (31) is connected to the second cable connector (2), and the female socket body (32) is connected to the first cable connector (1). The male socket body (31) has a first through hole that communicates with the connecting hole (14) of the second cable connector (2), and the female socket body (32) has a second through hole that communicates with the connecting hole (14) of the first cable connector (1). The conductive core (4) passes through the first through hole and the second through hole. The two slots (33) are respectively located at both ends of the male socket body (31) facing the female socket body (32), and the two clearance grooves (34) are respectively located on the outer periphery of the male socket body (31). At both ends of the side, the two clearance grooves (34) and the two slots (33) correspond to each other and are connected. The two hooks (35) are respectively provided at both ends of the female socket body (32) facing away from the first cable connector (1). The two hooks (35) and the two slots (33) correspond to each other and are engaged. The second annular groove (36) is provided on the side of the male socket body (31) facing the female socket body (32). The second annular groove (36) is the same as The shaft is located on the outside of the first through hole. The convex ring seat (37) is located on the side of the female socket body (32) facing the male socket body (31). The convex ring seat (37) is coaxially located on the outside of the second through hole. The convex ring seat (37) is inserted into the second annular groove (36). The two third annular grooves (38) are adjacent to each other on the outer periphery of the convex ring seat (37). The two sealing rings (39) correspond one-to-one with the two third annular grooves (38) and are engaged.

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