Fuse

Abstract

The utility model belongs to the technical field of low-voltage electric appliances, and discloses a fuse which is used for connecting two confluence cables so as to play a protection role. The fuse comprises a fuse support, a fuse tube and a hoop ring. Wherein the fuse support is provided with a containing groove extending in the first direction, the fuse tube is arranged in the containing groove, and the two cables are arranged at the two ends, in the first direction, of the fuse tube respectively. The number of the hoop rings is two, the two hoop rings tightly hold the two end portions of the fuse tube in the first direction respectively, and a cable core of each cable is clamped between the corresponding hoop ring and the outer wall of the end portion of the fuse tube. The side wall of the hoop ring is provided with a welding avoidance hole, and the wire core exposes the welding position through the welding avoidance hole. According to the fuse, an operator can conveniently weld the wire core on the outer wall of the fuse tube through the welding avoiding hole; the hoop ring not only plays a role in fixing the wire core when the wire core is welded, but also plays a role in pressing the wire core so as to prevent the wire core from being pulled to damage a welding point.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a fuse. Background Art

[0002] A fuse is an electrical appliance used to connect each branch of a cable busbar and play a protective role.

[0003] In the prior art, the connection between the fuse tube and the cable generally includes the following methods: 1) Riveting posts are provided on the fuse tube, and the cable is riveted to the riveting posts. This method has a high production cost and a large product structure size; 2) A nut and fastener method is used to achieve sealed wire fixing. This method lacks protection for the connection point between the fuse tube and the cable. When the cable is pulled, the pulling force will be transmitted to the connection point, causing potential hazards; 3) An injection molding and encapsulation method is used to achieve sealed wire fixing. This method has a high process cost, and the compatibility between the injection molding material and the cable material is poor, and the injection molding and encapsulation peeling phenomenon is likely to occur. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a fuse, so that the connection between the cable and the fuse tube is more firm, and the influence brought by pulling the cable is reduced.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] A fuse, comprising:

[0007] A fuse holder, provided with a receiving groove extending along a first direction;

[0008] A fuse tube, disposed in the receiving groove;

[0009] Two clamping rings are provided. The two clamping rings respectively clamp the two end portions of the fuse tube along the first direction. A welding avoidance hole is provided on the side wall of the clamping ring. A wire core of a cable can be clamped between the outer wall of the end portion of the clamping ring and the fuse tube. The welding position of the wire core is exposed by the welding avoidance hole, and the wire core is welded to the outer wall of the fuse tube.

[0010] As an optional solution, two support arms spaced apart along the first direction are provided in the receiving groove, and two end faces of the fuse tube along the first direction respectively abut against the two support arms.

[0011] As an optional solution, a first gap is provided between the support arm and the bottom of the receiving groove, and the wire core passes through the corresponding first gap and is clamped between the corresponding support arm and the end face of the fuse tube.

[0012] As an alternative, the fuse further includes two wire pressing buckles disposed at two end portions of the fuse wire bracket along the first direction. The wire pressing buckles press against one end of the corresponding support arm away from the fuse tube, and a clamping space is formed between the wire pressing buckles and the fuse wire bracket. The cable is fixedly clamped in the corresponding clamping space.

[0013] As an alternative, the wire pressing buckle includes a main body portion and a support rib plate disposed at one end of the main body portion facing the support arm. A clamping space is formed between the main body portion and the fuse wire bracket, and the support rib plate presses against the support arm.

[0014] As an alternative, two support rib plates are provided. The two support rib plates are spaced apart along the second direction, and a wire pressing plate is disposed between the two support rib plates. The wire pressing plate presses the wire core against the fuse wire bracket. The first direction and the second direction are perpendicular to each other.

[0015] As an alternative, when the wire pressing plate presses the wire core, the wire core is bent into a U shape.

[0016] As an alternative, the hoop ring is provided with a protruding portion. The welding avoidance hole is disposed on the protruding portion. A second gap is formed between the protruding portion and the outer wall of the end portion of the fuse tube. The wire core is disposed in the second gap.

[0017] As an alternative, the fuse further includes a housing and two pressure caps. The housing is provided with a through hole extending along the first direction. The fuse wire bracket is snap-fitted in the through hole. The two pressure caps respectively fasten to two ends of the housing along the first direction, and the pressure caps are snap-fitted with the housing. The pressure cap is provided with a second through hole for passing through the insulating portion of the cable.

[0018] As an alternative, at least two first limiting blocks distributed in a circumferential manner are provided on the inner wall of one end portion of the through hole. The first limiting block is provided with a card slot;

[0019] At least one end face of the fuse wire bracket along the first direction is provided with a buckle corresponding to the first limiting block one by one. The buckle includes an extending portion and a hook connected to each other. The extending portion is connected to the end face of the fuse wire bracket. The hook is disposed at one end of the extending portion away from the fuse wire bracket. The extending portion is limited in the card slot, and the first limiting block is limited between the hook and the end face of the fuse wire bracket.

[0020] As an alternative, first protruding limiting portions and second protruding limiting portions distributed in a circumferential manner are provided on the outer walls of two end portions of the housing;

[0021] The side wall of the compression cap is provided with a limiting slot hole corresponding to the first convex limiting portion, and the end face of the side wall of the compression cap facing the housing is provided with a concave slot corresponding to the second convex limiting portion. The limiting slot hole is clamped with the first convex limiting portion, and the second convex limiting portion is limited in the concave slot and abuts against the bottom of the concave slot.

[0022] As an alternative, a seal is provided between the compression cap and the housing. The seal includes a sealing sleeve and an annular seal provided on the outer wall of the sealing sleeve. The outer wall of the annular seal abuts against the inner wall of the through hole. The insulating portion of the cable passes through the first through hole of the sealing sleeve and the second through hole of the compression cap, and the sealing sleeve is inserted into the second through hole of the compression cap.

[0023] Advantages of the present utility model:

[0024] A fuse provided by the present utility model clamps the wire core of the cable between the end outer walls of the hoop ring and the fuse tube. The welding position of the wire core of the cable can be exposed through the welding avoidance hole, so as to facilitate the operator to weld the wire core to the outer wall of the fuse tube through the welding avoidance hole, and the connection is more firm; and the hoop ring not only plays a role in fixing the wire core during wire core welding, but also plays a role in pressing the wire core to prevent it from being pulled and damaging the welding point, improving the firmness of the connection. Description of the drawings

[0025] Figure 1 is an exploded view of the structure of the fuse provided by the embodiment of the present utility model;

[0026] Figure 2 is a partial structure diagram of the fuse provided by the embodiment of the present utility model;

[0027] Figure 3 is Figure 2 an enlarged view of the structure at A in

[0028] Figure 4 is a structure diagram of the wire pressing buckle involved in the embodiment of the present utility model;

[0029] Figure 5 is a cross-sectional view of a partial structure of the fuse provided by the embodiment of the present utility model;

[0030] Figure 6 is a structure diagram of the housing involved in the embodiment of the present utility model;

[0031] Figure 7 is a cross-sectional view of the connection between the housing and the fuse support involved in the embodiment of the present utility model;

[0032] Figure 8Yes Figure 7 Cross-sectional view taken along line B-B;

[0033] Figure 9 Is a cross-sectional view of the fuse provided by the embodiment of the present utility model.

[0034] In the figure:

[0035] 100, cable; 101, core; 102, insulating part;

[0036] 1, fuse holder; 11, receiving groove; 12, support arm; 121, short arm; 1211, protruding contact part; 13, buckle; 131, extension part; 132, catch;

[0037] 2, fuse tube;

[0038] 3, hoop ring; 31, welding avoidance hole; 32, protruding part;

[0039] 4, wire pressing buckle; 41, main body part; 42, support rib plate; 43, wire pressing plate;

[0040] 5, outer shell; 51, through hole; 52, first limit stop; 521, card slot; 53, second limit stop; 54, first protruding limit part; 55, second protruding limit part;

[0041] 6, compression cap; 61, limit slot hole; 62, recessed groove; 63, annular inclined surface;

[0042] 7, seal; 71, sealing sleeve; 72, annular seal. Detailed implementation manners

[0043] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar components or components with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present utility model, and should not be construed as limiting the present utility model.

[0044] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0045] In the description of the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0046] The technical solution of the present utility model will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0047] As Figures 1-9 shown, an embodiment of the present utility model provides a fuse, which is used to connect two converging cables 100 to play a protective role.

[0048] The fuse includes a fuse holder 1, a fuse tube 2 and a clamping ring 3. Among them, the fuse holder 1 is provided with a receiving groove 11 extending in a first direction (i.e., the X-axis direction in the figure), the fuse tube 2 is disposed in the receiving groove 11, and the two cables 100 are respectively disposed at both ends of the fuse tube 2 along the first direction. There are two clamping rings 3, and the two clamping rings 3 are respectively clamped to both ends of the fuse tube 2 along the first direction. The core 101 of each cable 100 is clamped between the corresponding clamping ring 3 and the outer wall of the end of the fuse tube 2 to fix the core 101; a welding avoidance hole 31 is provided on the side wall of the clamping ring 3, and the core 101 partially coincides with the welding avoidance hole 31 so that the core 101 exposes the welding position, and the operator welds the core 101 to the outer wall of the fuse tube 2 through the welding avoidance hole 31.

[0049] By clamping the core 101 of the cable 100 between the clamping ring 3 and the outer wall of the end of the fuse tube 2, the welding position of the core 101 of the cable 100 can be exposed through the welding avoidance hole 31, so as to facilitate the operator to weld the core 101 to the outer wall of the fuse tube 2 through the welding avoidance hole 31, and the connection is more firm; and the clamping ring 3 not only plays a role in fixing the core 101 during the welding of the core 101, but also plays a role in pressing the core 101 to prevent it from being pulled and damaging the welding point, improving the firmness of the connection.

[0050] Further, as Figures 2-3As shown, two support arms 12 are arranged in the accommodating groove 11 and are spaced apart along the first direction. When the fuse tube 2 is arranged in the accommodating groove 11, the two end surfaces of the fuse tube 2 along the first direction are respectively abutted against the two support arms 12, and a first gap is provided between the support arms 12 and the bottom of the accommodating groove 11. The part of the wire core 101 of the cable 100 other than the part welded to the fuse tube 2 is passed through the corresponding first gap and clamped between the corresponding support arm 12 and the end surface of the fuse tube 2. This structure enables the wire core 101 to be clamped between the support arm 12 and the end surface of the fuse tube 2, thereby further improving the firmness of the connection.

[0051] Optionally, the support arm 12 includes two short arms 121, which are spaced apart along the second direction (i.e., the Y-axis direction in the figure) and are respectively connected to the side walls of the accommodating groove 11. A first gap is provided between the short arms 121 and the bottom of the accommodating groove 11. When the fuse tube 2 is arranged in the accommodating groove 11, the two end surfaces of the fuse tube 2 along the first direction are respectively abutted against the corresponding two short arms 121. The short arms 121 can be elastically expanded under the action of the fuse tube 2, so that the short arms 121 form an inward elastic extrusion force to fix the fuse tube 2 and elastically compress the wire core 101.

[0052] The first direction and the second direction are perpendicular to each other.

[0053] Furthermore, a protruding contact portion 1211 is provided at one end of the short arm 121 facing the fuse tube 2 , and the protruding contact portion 1211 can abut against the end surface of the fuse tube 2 , so that the short arm 121 can reliably abut against the end surface of the fuse tube 2 .

[0054] Optionally, in order to further improve the connection firmness of the cable 100, as Figures 3-4 As shown, the fuse also includes a wire pressing buckle 4 arranged at both ends of the fuse holder 1 along the first direction, and the wire pressing buckle 4 can abut against the ends of the corresponding two short arms 121 away from the fuse tube 2, so that the fuse tube 2 is fixed more firmly and the wire core 101 is clamped more stably; and a clamping space is formed between the wire pressing buckle 4 and the fuse holder 1, and the insulating part 102 of the cable 100 is fixedly clamped in the clamping space, so as to further realize the connection firmness of the cable 100.

[0055] Specifically, the wire buckle 4 includes a main body 41 and a support rib 42 arranged at one end of the main body 41 facing the support arm 12, and the ends of the main body 41 and the fuse holder 1 are both provided with semi-annular grooves, and the semi-annular grooves of the main body 41 and the semi-annular grooves of the fuse holder 1 are interlocked to form a clamping space; two support ribs 42 can be provided, and the two support ribs 42 are spaced apart along the second direction, and the two support ribs 42 can respectively press against the corresponding two short arms 121.

[0056] In other embodiments, the support arm 12 can also be set as an integral structure, and only one support rib plate 42 needs to be abutted against the support arm 12.

[0057] Optionally, the main body portion 41 is welded to the fuse holder 1.

[0058] In order to form a bend in the portion of the wire core 101 other than the welding position welded to the fuse tube 2, as Figure 5 shown, a wire pressing plate 43 is arranged between the two support rib plates 42. When the wire pressing buckle 4 is assembled to the fuse holder 1, the two support rib plates 42 respectively press against the corresponding two short arms 121, and the wire pressing plate 43 presses against the wire core 101 to form a bend, reducing the influence of the pulling force on the wire core 101.

[0059] By providing the wire pressing buckle 4, it can be ensured that the welding point of the wire core 101 is not affected by the pulling force. That is, when the cable 100 is pulled, the main body portion 41 absorbs most of the pulling force, and there is a certain margin for the wire core 101. When the wire core 101 is pulled, the wire pressing plate 43 presses against the wire core 101, and the wire core 101 is bent into a U shape, so that the wire pressing plate 43 causes resistance to the wire core 101, and the support arm 12 presses the wire core 101 against the end face of the fuse tube 2 to further form resistance, ensuring that the welding is not affected.

[0060] Optionally, referring again to Figure 3 , the hoop ring 3 is provided with a protruding portion 32, the welding avoidance hole 31 is arranged on the protruding portion 32, and there is a second gap between the protruding portion 32 and the outer wall of the end of the fuse tube 2. The welding position where the wire core 101 is welded is arranged in the second gap, and the second gap is used to accommodate the wire core 101, with a more reasonable structural design.

[0061] In order to make the installation of the hoop ring 3 more convenient, the hoop ring 3 can be made of an elastic sheet, so that the hoop ring 3 elastically hugs the outer wall of the end of the fuse tube 2.

[0062] Optionally, the fuse holder 1 is an injection molded part, which is integrally formed by an injection molding process.

[0063] As Figure 1 and combined with Figures 6-8 shown, the fuse further includes a housing 5 and two pressure caps 6. The housing 5 is provided with a through hole 51 extending in the first direction, the fuse holder 1 is snap-fitted in the through hole 51, and the two pressure caps 6 are respectively buckled and snap-fitted at both ends of the housing 5 along the first direction to close the through hole 51.

[0064] Specifically, two circumferentially distributed first limiting blocks 52 are provided on the inner wall of one end of the through hole 51 along the first direction. The first limiting blocks 52 are provided with clamping grooves 521. One end face of the fuse holder 1 along the first direction is provided with buckles 13 corresponding to the first limiting blocks 52 one by one. The buckle 13 includes an extension part 131 and a hook 132 connected to each other. The extension part 131 is connected to the end face of the fuse holder 1, and the hook 132 is arranged at one end of the extension part 131 far from the fuse holder 1. During installation, the fuse holder 1 penetrates into the through hole 51 from the side where the first limiting block 52 is not provided. After the hook 132 passes through the clamping groove 521, the extension part 131 is limited in the clamping groove 521 to prevent the fuse holder 1 from rotating. The first limiting block 52 is limited between the hook 132 and the end face of the fuse holder 1 to prevent the fuse holder 1 from displacing along the first direction. Of course, three or four first limiting blocks 52 can also be provided.

[0065] In this embodiment, buckles 13 are provided on both end faces of the fuse holder 1 along the first direction, so that the fuse holder 1 can be directly installed without confirming the installation direction during assembly, and the operation is more convenient.

[0066] Optionally, in order to improve the installation stability of the fuse holder 1, a plurality of circumferentially distributed second limiting blocks 53 can also be provided on the inner wall of the end of the through hole 51 where the first limiting block 52 is provided. The end faces between the fuses can abut against the first limiting block 52 and the second limiting block 53 to make the structure more stable.

[0067] Optionally, referring again to Figure 6 and combining with Figure 1 and Figure 9 As shown, circumferentially distributed first convex limiting parts 54 and second convex limiting parts 55 are provided on the outer walls of both ends of the housing 5. The side wall of the compression cap 6 is provided with a limiting slot hole 61, and the side wall end face of the compression cap 6 facing the housing 5 is provided with a concave groove 62. When the compression cap 6 is buckled on the end of the housing 5, the first convex limiting part 54 is clamped with the limiting slot hole 61, and the second convex limiting part 55 is limited in the concave groove 62 and abuts against the bottom of the concave groove 62. This structure makes the installation of the compression cap 6 convenient and stable.

[0068] In this embodiment, both the first convex limiting part 54 and the second convex limiting part 55 are provided with two, and the first convex limiting part 54 and the second convex limiting part 55 are cross-circumferentially distributed.

[0069] Optionally, in order to facilitate the first convex limiting part 54 to be inserted into the limiting slot hole 61, an inclined surface is provided on the outer end face of the first convex limiting part 54.

[0070] Optionally, a seal 7 is provided between the compression cap 6 and the housing 5. The seal 7 includes a sealing sleeve 71 and an annular seal 72 provided on the outer wall of the sealing sleeve 71. The outer wall of the annular seal 72 abuts against the inner wall of the through hole 51. The insulating portion 102 of the cable 100 is inserted into the first through hole of the sealing sleeve 71 and the second through hole of the compression cap 6, and the sealing sleeve 71 is inserted into the second through hole of the compression cap 6. Specifically, the second through hole includes a straight section and a tapered section. When the compression cap 6 is installed, the straight section is inserted into the insulating portion 102 of the cable 100, and the sealing sleeve 71 is inserted into the tapered section. The annular inclined surface 63 of the tapered section can press against the outer wall of the sealing sleeve 71 to seal between the sealing sleeve 71 and the insulating portion 102 of the cable 100. It can be understood that the outer wall of the annular seal 72 has an interference fit with the inner wall of the through hole 51, between the first through hole of the sealing sleeve 71 and the insulating portion 102 of the cable 100.

[0071] Further, two annular ridges are provided on the hole wall of the first through hole of the sealing sleeve 71 and are spaced apart along the first direction to further improve the sealing effect.

[0072] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A fuse, characterized in that, include: A fuse holder (1) provided with a receiving groove (11) extending along a first direction; A fuse tube (2) is arranged in the containing groove (11); Two clamping rings (3) are provided, and the two clamping rings (3) are respectively clamped to the two ends of the fuse tube (2) along the first direction, and the side walls of the clamping rings (3) are provided with welding avoidance holes (31), and the wire core (101) of the cable (100) can be clamped between the clamping ring (3) and the outer wall of the end of the fuse tube (2), and the welding avoidance holes (31) expose the welding position of the wire core (101), and the wire core (101) is welded to the outer wall of the fuse tube (2).

2. The fuse according to claim 1, wherein Two support arms (12) are arranged in the accommodating groove (11) and are spaced apart along the first direction. The two end surfaces of the fuse tube (2) along the first direction are respectively in contact with the two support arms (12).

3. The fuse according to claim 2, characterized in that, A first gap is provided between the support arm (12) and the bottom of the accommodating groove (11), and the wire core (101) is passed through the corresponding first gap and clamped between the corresponding support arm (12) and the end face of the fuse tube (2).

4. The fuse according to claim 3, characterized in that, The fuse further comprises two wire pressing buckles (4) arranged at both ends of the fuse holder (1) along the first direction, the wire pressing buckles (4) pressing against an end of the corresponding support arm (12) away from the fuse tube (2), and a clamping space is formed between the wire pressing buckle (4) and the fuse holder (1), and the cable (100) is fixedly clamped in the corresponding clamping space.

5. The fuse according to claim 4, characterized in that, The wire clamp (4) comprises a main body (41) and a supporting rib (42) arranged at one end of the main body (41) facing the supporting arm (12), wherein the clamping space is formed between the main body (41) and the fuse holder (1), and the supporting rib (42) presses against the supporting arm (12).

6. The fuse according to claim 5, characterized in that, Two supporting ribs (42) are provided, the two supporting ribs (42) are spaced apart along the second direction, and a wire pressing plate (43) is provided between the two supporting ribs (42), the wire pressing plate (43) presses the wire core (101) against the fuse holder (1), and the first direction and the second direction are perpendicular to each other.

7. The fuse according to claim 6, wherein When the wire pressing plate (43) presses against the wire core (101), the wire core (101) is bent into a U shape.

8. The fuse according to claim 1, characterized in that, The hoop ring (3) is provided with a raised portion (32), the welding avoidance hole (31) is provided on the raised portion (32), a second gap is provided between the raised portion (32) and the outer wall of the end of the fuse tube (2), and the wire core (101) is provided in the second gap.

9. The fuse according to claim 1, characterized in that, The fuse further includes a housing (5) and two pressure caps (6). The housing (5) is provided with a through hole (51) extending along the first direction. The fuse holder (1) is snap-fitted into the through hole (51). The two pressure caps (6) are respectively buckled at both ends of the housing (5) along the first direction, and the pressure caps (6) are snap-fitted with the housing (5). The pressure cap (6) is provided with a second through hole for passing through the insulating part (102) of the cable (100).

10. The fuse according to claim 9, characterized in that, At least two first limiting blocks (52) distributed circumferentially are provided on the inner wall of one end of the through hole (51). The first limiting block (52) is provided with a clamping groove (521). At least one end face of the fuse holder (1) along the first direction is provided with a buckle (13) corresponding to the first limiting block (52) one by one. The buckle (13) includes an extension part (131) and a hook (132) connected to each other. The extension part (131) is connected to the end face of the fuse holder (1). The hook (132) is arranged at one end of the extension part (131) far from the fuse holder (1). The extension part (131) is limited in the clamping groove (521), and the first limiting block (52) is limited between the hook (132) and the end face of the fuse holder (1).

11. The fuse according to claim 9, characterized in that, Circumferentially distributed first convex limiting parts (54) and second convex limiting parts (55) are provided on the outer walls of both ends of the housing (5). A limiting groove hole (61) corresponding to the first convex limiting part (54) is provided on the side wall of the pressure cap (6). A concave groove (62) corresponding to the second convex limiting part (55) is provided on the end face of the side wall of the pressure cap (6) facing the housing (5). The limiting groove hole (61) is snap-fitted with the first convex limiting part (54). The second convex limiting part (55) is limited in the concave groove (62) and abuts against the bottom of the concave groove (62).

12. The fuse according to claim 9, characterized in that, A sealing member (7) is provided between the pressure cap (6) and the housing (5). The sealing member (7) includes a sealing sleeve (71) and an annular seal (72) provided on the outer wall of the sealing sleeve (71). The outer wall of the annular seal (72) abuts against the inner wall of the through hole (51). The insulating part (102) of the cable (100) passes through the first through hole of the sealing sleeve (71) and the second through hole of the pressure cap (6). The sealing sleeve (71) is inserted into the second through hole of the pressure cap (6).

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