Pagoda joint structure

Abstract

The utility model relates to the technical field of hose connection, in particular to a pagoda joint structure. The pagoda joint structure comprises a connecting pipe and an external hose, a plurality of pagoda cones are arranged on the peripheral wall of the connecting pipe in a protruding mode, and the pagoda cones abut against the inner wall of the external hose after the connecting pipe stretches into the external hose; the first hose clamp is arranged on the peripheral wall of the outer hose in a sleeving mode and located at the corresponding position in the radial direction of the pagoda cone. The sealing part is arranged on an insertion path of the connecting pipe, the sealing part and the pagoda cones are arranged at intervals, and the sealing part can seal a gap between the connecting pipe and the external hose. The connecting pipe has the advantages that the sealing part is arranged on the insertion path of the connecting pipe, so that the problem of poor sealing property caused by cutting injury due to abutting sealing of the connecting pipe and a sharp pagoda cone structure is solved. And the first hose clamp and the second hose clamp are further arranged, so that the external hose and the connecting pipe are tightly connected, and the relative position is more fixed.

Description

Technical Field

[0001] The utility model relates to the technical field of hose connection, in particular to a pagoda joint structure. Background Art

[0002] Pagoda joints are widely used in hose connections in pipeline structures due to their low cost advantage. A plurality of pagoda cones are provided on the pagoda joint. The outer peripheral wall of the pagoda cone abuts against the inner wall of the hose to achieve a seal between the pagoda joint and the hose. In order to ensure that the relative position of the pagoda joint and the hose is fixed, a throat clamp is also provided on the outer peripheral wall of the hose. The throat clamp can make the hose and the pagoda cone tightly abut. However, since the outer peripheral wall of the pagoda cone is relatively sharp, it is easy to cut the hose structure with lower hardness, causing pipeline leakage problems. Utility Model Content

[0003] Based on this, the utility model provides a pagoda joint structure to solve the above technical problems.

[0004] A pagoda joint structure, the pagoda joint structure comprising: a connecting pipe and an external hose, a plurality of pagoda cones protruding on the outer peripheral wall of the connecting pipe, the external hose being located at the outer periphery of the plurality of pagoda cones, the plurality of pagoda cones abutting against the inner wall of the external hose; a first throat hoop, the first throat hoop being sleeved on the outer peripheral wall of the external hose, and the first throat hoop being located at corresponding positions in radial directions of the plurality of pagoda cones, the external hose being compressed between the first throat hoop and the plurality of pagoda cones; a sealing portion being arranged on the insertion path of the connecting pipe, the sealing portion being spaced apart from the plurality of pagoda cones, and the sealing portion sealing the gap between the connecting pipe and the external hose.

[0005] In this way, the tube is inserted into the external hose, and the outer peripheral wall of the pagoda cone abuts the inner wall of the external hose, so the medium cannot pass between the pagoda cone and the external hose, thereby realizing the first layer of sealing between the connecting pipe and the external hose, and the first throat clamp is sleeved on the outer peripheral wall of the external hose, and the sleeve position corresponds to the position of the pagoda cone, so the first throat clamp can tighten the external hose along the radial inward direction, so that the abutment between the external hose and the pagoda cone is tighter, thereby improving the sealing performance between the two and realizing the fixation of the relative position between the connecting pipe and the external hose. Since the pagoda cone is relatively sharp, the abutment of its outer peripheral wall with the inner wall of the external hose tends to be line contact, and the contact area is small, which causes the problem that the external hose is easily cut and damaged. Therefore, the sealing part is arranged on the insertion path of the connecting pipe, which can seal the gap between the connecting pipe and the external hose, forming a second layer of sealing between the connecting pipe and the external hose, even if the inner wall of the external hose is damaged and causes pipeline leakage, the sealing part can make up for this problem, so that the sealing between the connecting pipe and the external hose is stable and reliable.

[0006] In one embodiment, a first groove is formed on the outer peripheral wall of the connecting pipe, a sealing ring is disposed in the first groove, the outer peripheral wall of the sealing ring abuts against the inner wall of the external hose, and the sealing ring and the first groove form the sealing portion.

[0007] In one embodiment, the pagoda joint structure further includes a second throat clamp, which is sleeved on the outer peripheral wall of the external hose and is located at a corresponding position in the radial direction of the sealing ring.

[0008] In one embodiment, along the axial direction of the connecting pipe, the shortest distance between the middle position of the first groove and the pagoda cone closest to the first groove is L1, and the value range of L1 is: 15mm≤L1≤30mm.

[0009] In one embodiment, the pagoda joint structure also includes a joint, which is connected to the end of an external hose, and a through hole is formed on the joint. The connecting pipe extends into the external hose after passing through the through hole, and the outer peripheral wall of the connecting pipe abuts against the inner peripheral wall of the through hole formed by the joint.

[0010] In one embodiment, a second groove is provided on the inner circumferential wall of the joint forming the through hole, a sealing ring is provided in the second groove, the inner circumferential wall of the sealing ring abuts against the outer circumferential wall of the connecting pipe, and the sealing ring and the second groove form the sealing portion.

[0011] In one embodiment, the connector includes a connecting section and a sealing section, the connecting section is sleeved on the outer peripheral wall of the external hose, the sealing section is connected to the connecting section and extends in a direction away from the external hose, the inner diameter of the sealing section is smaller than the inner diameter of the connecting section, and the second groove is opened on the inner wall of the sealing section.

[0012] In one embodiment, the inner diameter of the sealing section is smaller than the inner diameter of the connecting section to form a step, and the step abuts against the end of the external hose.

[0013] In one embodiment, along the axial direction of the connecting pipe, the distance between the middle position of the second groove and the step is L2, and the value range of L2 is: 10mm≤L2≤15mm.

[0014] In one embodiment, the pipe includes a pipe head, a plurality of the pagoda cones are arranged at one end of the pipe, the pipe head is arranged at the other end of the pipe, and the pipe head is located outside the external hose.

[0015] Compared with the prior art, the utility model solves the problem of poor sealing caused by the cutting of the pipe due to the abutment and sealing with the sharp pagoda cone structure by providing a sealing part on the insertion path of the pipe. A first throat clamp and a second throat clamp are also provided, so that the connection between the external hose and the pipe is tight and the relative position is more fixed. Two layers of sealing are formed between the pipe and the external hose, so that the sealing between the pipe and the external hose is stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A structural cross-sectional view of the first embodiment of the pagoda joint structure provided by the utility model;

[0017] Figure 2 A three-dimensional diagram of the first embodiment of the pagoda joint structure provided by the utility model;

[0018] Figure 3 A structural cross-sectional view of a second embodiment of the pagoda joint structure provided by the utility model;

[0019] Figure 4 This is a stereoscopic diagram of the second embodiment of the pagoda joint structure provided by the utility model.

[0020] The symbols in the figure mean the following:

[0021] 100. Pagoda joint structure; 10. Connecting pipe; 11. Pagoda cone; 12. Connecting pipe head; 20. Sealing part; 21. First groove; 23. Second groove; 22. Sealing ring; 30. First throat hoop; 40. Second throat hoop; 50. Joint; 51. Perforation; 52. Connecting section; 53. Sealing section; 54. Step; 60. External hose. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0023] It should be noted that when a mechanism is referred to as being "fixed to" or "set on" another mechanism, it may be directly on the other mechanism or there may be a central mechanism. When a mechanism is considered to be "connected to" another mechanism, it may be directly connected to the other mechanism or there may be a central mechanism at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0025] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0027] Pagoda joints are used in pipeline structures and usually extend into and connect to hoses. However, since a pagoda cone is protruding from the outer wall of the pagoda joint, the outer wall of the pagoda cone is relatively sharp. When a throat clamp is installed to make the relative position between the hose and the pagoda joint more stable, the throat clamp makes the hose and the pagoda cone in close contact, causing the inner wall of the hose to be easily cut by the pagoda cone, which in turn causes problems such as insufficient sealing and pipeline leakage.

[0028] In view of this, the present application provides a pagoda joint structure 100 , which improves the sealing performance between the connecting pipe 10 and the external hose 60 by setting a sealing portion 20 on the insertion path of the connecting pipe 10 .

[0029] See also Figure 1-Figure 4The pagoda joint structure 100 includes a connecting pipe 10, an external hose 60, a first throat hoop 30 and a sealing portion 20. A plurality of pagoda cones 11 are convexly provided on the outer peripheral wall of the connecting pipe 10. The external hose 60 is located at the outer periphery of the plurality of pagoda cones 11, and the plurality of pagoda cones 11 abut against the inner wall of the external hose 60. The first throat hoop 30 is sleeved on the outer peripheral wall of the external hose 60, and the first throat hoop 30 is located at a corresponding position in the radial direction of the plurality of pagoda cones 11, and the external hose 60 is pressed between the first throat hoop 30 and the plurality of pagoda cones 11. The sealing portion 20 is arranged on the insertion path of the connecting pipe 10, and the sealing portion 20 is spaced apart from the plurality of pagoda cones 11, and the sealing portion 20 seals the gap between the connecting pipe 10 and the external hose 60.

[0030] In this way, the connecting pipe 10 is inserted into the external hose 60, and the outer peripheral wall of the pagoda cone 11 abuts against the inner wall of the external hose 60 to form a seal, so that the medium cannot pass between the pagoda cone 11 and the external hose 60, thereby realizing the first layer of sealing between the connecting pipe 10 and the external hose 60. The first throat clamp 30 is sleeved on the outer peripheral wall of the external hose 60, and the sleeve position corresponds to the position of the pagoda cone 11. Therefore, the first throat clamp 30 can tighten the external hose 60 in the radial inward direction, so that the abutment between the external hose 60 and the pagoda cone 11 is tighter, thereby improving the sealing performance between the two and realizing the fixation of the relative position between the connecting pipe 10 and the external hose 60. Since the pagoda cone 11 is relatively sharp, its outer peripheral wall and the external The abutment of the inner wall of the hose 60 tends to be in line contact, and the contact area is small. When the clamping force of the first throat clamp 30 is too large (to ensure the sealing performance between the pagoda cone 11 and the external hose 60), that is, when the pressing force between the external hose 60 and the pagoda cone 11 is too large, it is easy to cause the external hose 60 to be cut and damaged. Therefore, by adding a sealing portion 20 arranged on the insertion path of the connecting pipe 10, the gap between the connecting pipe 10 and the external hose 60 can be sealed to form a second layer of seal between the connecting pipe 10 and the external hose 60, that is, the sealing performance between the connecting pipe 10 and the external hose 60 is improved by double sealing. At this time, the clamping force of the first throat clamp 30 can be appropriately reduced, which is beneficial to reduce the risk of the external hose 60 being cut and damaged.

[0031] In the present application, there are multiple embodiments for optional arrangement of the sealing portion 20, which are described in detail one by one here:

[0032] Embodiment 1

[0033] See also Figure 1-Figure 2A first groove 21 is provided on the outer peripheral wall of the connecting pipe 10, and a sealing ring 22 is provided in the first groove 21. The outer peripheral wall of the sealing ring 22 abuts against the inner wall of the external hose 60, and the sealing ring 22 and the first groove 21 form a sealing portion 20. In this way, the first groove 21 can facilitate the installation of the sealing ring 22. The sealing ring 22 is installed in the first groove 21. Both side walls and the groove bottom of the first groove 21 can limit the sealing ring 22. The sealing ring 22 is used as a sealing structure between the connecting pipe 10 and the hose. The sealing ring 22 has a good sealing effect and is easy to assemble.

[0034] Furthermore, the pagoda joint 50 structure also includes a second throat hoop 40, which is sleeved on the outer peripheral wall of the external hose 60 and is located at a corresponding position in the radial direction of the sealing ring 22. In this way, the second throat hoop 40 can give the external hose 60 a radially inward extrusion force, so that the sealing ring 22 can be pressed between the inner wall of the external hose 60 and the first groove 21, so that the sealing ring 22 and the external hose 60 are more tightly combined and the sealing effect is better.

[0035] Along the axial direction of the connecting pipe 10, the shortest distance between the middle position of the first groove 21 and the pagoda cone 11 closest to the first groove 21 is L1, and the value range of L1 is: 15mm≤L1≤30mm. In this way, the setting position of the sealing part 20 is reasonably set, which can prevent the distance between the sealing part 20 and the pagoda cone 11 from being too short, causing the clamping force of the second throat clamp 40 on the external hose 60 to interfere with the clamping force between the external hose 60 and the pagoda cone 11, thereby increasing the risk of the external hose 60 being cut and damaged by the pagoda cone 11, and also prevent the position of the sealing part 20 from being too close to the pipe mouth of the external hose 60, causing inconvenience in processing and assembly.

[0036] It should be explained that the middle position of the first groove 21 refers to a position located in the first groove 21 and having the same distance as the two side walls of the first groove 21 along the axial direction of the connecting pipe 10 .

[0037] Exemplarily, L1 is set to 15mm, 17mm, 19mm, 21mm, 23mm, 25mm, 27mm or 29mm, etc. It only needs to be between 15mm and 30mm, and is not limited to the two end values.

[0038] Embodiment 2

[0039] See also Figure 3-Figure 4 The pagoda joint structure 100 also includes a joint 50, which is connected to the end of the external hose 60. The joint 50 is provided with a through hole 51, and the connecting pipe 10 passes through the through hole 51 and extends into the external hose 60. The outer peripheral wall of the connecting pipe 10 abuts against the inner peripheral wall of the through hole 51 formed by the joint 50.

[0040] In this embodiment, the external hose 60 is directly hot-melted into the connector 50 , thereby achieving connection between the pipe opening of the external hose 60 and the connector 50 .

[0041] It should be explained that, in this embodiment, the gap between the connecting pipe 10 and the external hose 60 sealed by the sealing portion 20 also refers to the gap between the connecting pipe 10 and the joint 50, thereby further sealing the gap between the connecting pipe 10 and the external hose 60. The joint 50 is provided to facilitate the sealing of the gap between the connecting pipe 10 and the external hose 60 by the sealing portion 20.

[0042] The second groove 23 is provided on the inner peripheral wall of the joint 50 forming the through hole 51, and a sealing ring 22 is provided in the second groove 23. The inner peripheral wall of the sealing ring 22 abuts against the outer peripheral wall of the connecting pipe 10, and the sealing ring 22 is pressed between the joint 50 and the connecting pipe 10, and the sealing ring 22 and the second groove 23 form a sealing portion 20. In other words, the sealing portion 20 is provided on the inner wall of the joint 50, and after the sealing ring 22 is installed, the connecting pipe 10 is inserted into the through hole 51 of the joint 50 to achieve a sealed fit, and the installation of the sealing ring 22 is more stable.

[0043] Of course, in other embodiments, the second groove 23 can also be opened on the outer wall of the connecting pipe 10, and the sealing ring 22 is correspondingly assembled in the second groove 23 on the outer wall of the connecting pipe 10, which can also achieve the sealing cooperation between the joint 50 and the connecting pipe 10.

[0044] Furthermore, the connector 50 includes a connecting section 52 and a sealing section 53. The connecting section 52 is used to be sleeved on the outer peripheral wall of the external hose 60. The sealing section 53 is connected to the connecting section 52 and extends in a direction away from the external hose 60. The second groove 23 is formed on the inner wall of the sealing section 53. In this way, the connecting section 52 is dedicated to the connection with the external hose 60, which facilitates the connection between the connector 50 and the external hose 60. The sealing section 53 extends in a direction away from the external hose 60. The inner diameter of the sealing section 53 is smaller than the inner diameter of the connecting section 52. The second groove 23 is formed on the sealing section 53. Therefore, the formation of the second groove 23 and the assembly of the sealing ring will not affect the connection between the connecting section 52 and the external hose 60.

[0045] Furthermore, the inner diameter of the sealing section 53 is smaller than the inner diameter of the connecting section 52 to form a step 54, and the step 54 abuts against the end of the external hose 60. In this way, the sealing section 53 abuts against the end of the external hose 60, which can play a positioning role and prevent the connector 50 from falling into the external hose 60. The smaller inner diameter of the sealing section 53 also facilitates its cooperation with the outer peripheral wall of the connecting pipe 10.

[0046] In this embodiment, the inner diameter of the sealing section 53 is set to be the same as the inner diameter of the external hose 60. Therefore, when the connecting pipe 10 is inserted, the outer peripheral wall of the connecting pipe 10 can not only abut with the inner peripheral wall of the sealing section 53 to achieve a sealing effect, but also form a sealing match with the inner peripheral wall of the external hose 60, further improving the sealing effect between the connecting pipe 10 and the external hose 60. After the outer peripheral wall of the connecting pipe 10 abuts against the inner peripheral wall of the connecting pipe head 12, the sealing ring will be compressed and deformed, so that the sealing ring further fills the gap between the joint 50 and the connecting pipe 10. It should be noted that the same inner diameter here includes the same within the allowable range of the processing tolerance.

[0047] As the sealing ring is squeezed and deformed, the elastic force of the sealing ring will react on the joint 50 and the connecting pipe 10, so that the relative position between the joint 50 and the connecting pipe 10 is fixed, and a tight connection between the joint 50 and the connecting pipe 10 is achieved.

[0048] Along the axial direction of the pipe 10, the distance between the middle position of the second groove 23 and the step 54 is L2, and the value range of L2 is 10mm≤L2≤15mm. Such a setting has similar technical effects to those in the first embodiment, which not only prevents the distance between the sealing part 20 and the pagoda cone 11 from being too short to increase the risk of damage to the external hose 60, but also prevents the position of the sealing part 20 from being too close to the position of the pipe mouth of the external hose 60 to cause inconvenience in processing and assembly.

[0049] It should be explained that the middle position of the second groove 23 refers to a position located in the second groove 23 and having the same distance from both side walls of the second groove 23 along the axial direction of the connecting pipe 10 .

[0050] Exemplarily, the value of L2 is 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, etc. It only needs to be between 10mm and 15mm, and is not limited to the two end values.

[0051] The pipe 10 further includes a pipe head 12, the pagoda cone 11 is arranged at one end of the pipe 10, and the pipe head 12 is arranged at the other end of the pipe 10. In this way, the pipe head 12 extends out of the external hose 60, which is convenient for manual connection with the outside through the pipe head 12.

[0052] The cross section of the outer peripheral wall of the pipe joint 12 is set to a polygonal shape to facilitate the use of a wrench or other tool to twist the pipe joint 12. The outer diameter of the pipe joint 12 is larger than the inner diameter of the joint 50, thereby preventing the entire pipe joint 10 from entering the interior of the joint 50.

[0053] In this embodiment, the sealing ring and the external hose 60 are both made of EPDM rubber. The expansion rate of the two is similar and the material hardness is also similar, so they will not damage each other, thereby improving the reliability of the seal.

[0054] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A pagoda joint structure, characterized in that: The pagoda joint structure comprises: A connecting pipe (10) and an external hose (60), wherein a plurality of pagoda cones (11) are convexly provided on the outer peripheral wall of the connecting pipe (10), the external hose (60) is located on the outer periphery of the plurality of pagoda cones (11), and the plurality of pagoda cones (11) abut against the inner wall of the external hose (60); A first throat hoop (30), wherein the first throat hoop (30) is sleeved on the outer peripheral wall of the external hose (60), and the first throat hoop (30) is located at a corresponding position in the radial direction of the plurality of pagoda cones (11), and the external hose (60) is compressed between the first throat hoop (30) and the plurality of pagoda cones (11); The sealing part (20) is arranged on the insertion path of the connecting pipe (10), the sealing part (20) and the plurality of the pagoda cones (11) are arranged at intervals, and the sealing part (20) seals the gap between the connecting pipe (10) and the external hose (60).

2. The pagoda joint structure according to claim 1, characterized in that: A first groove (21) is provided on the outer peripheral wall of the connecting pipe (10), a sealing ring (22) is provided in the first groove (21), the outer peripheral wall of the sealing ring (22) abuts against the inner wall of the external hose (60), and the sealing ring (22) and the first groove (21) form the sealing portion (20).

3. The pagoda joint structure according to claim 2, characterized in that: The pagoda joint structure also includes a second throat hoop (40), which is sleeved on the outer peripheral wall of the external hose (60) and is located at a corresponding position in the radial direction of the sealing ring (22).

4. The pagoda joint structure according to claim 2 or 3, characterized in that: Along the axial direction of the connecting pipe (10), the shortest distance between the middle position of the first groove (21) and the pagoda cone (11) closest to the first groove (21) is L1, and the value range of L1 is: 15mm≤L1≤30mm.

5. The pagoda joint structure according to claim 1, characterized in that: The pagoda joint structure also includes a joint (50), the joint (50) is connected to the end of the external hose (60), the joint (50) is provided with a through hole (51), the connecting pipe (10) passes through the through hole (51) and extends into the external hose (60), and the outer peripheral wall of the connecting pipe (10) abuts against the inner peripheral wall of the joint (50) forming the through hole (51).

6. The pagoda joint structure according to claim 5, characterized in that: A second groove (23) is provided on the inner peripheral wall of the joint (50) forming the through hole (51), a sealing ring (22) is provided in the second groove (23), the inner peripheral wall of the sealing ring (22) abuts against the outer peripheral wall of the connecting pipe (10), and the sealing ring (22) and the second groove (23) form the sealing portion (20).

7. The pagoda joint structure according to claim 6, characterized in that: The joint (50) comprises a connecting section (52) and a sealing section (53); the connecting section (52) is sleeved on the outer peripheral wall of the external hose (60); the sealing section (53) is connected to the connecting section (52) and extends in a direction away from the external hose (60); the inner diameter of the sealing section (53) is smaller than the inner diameter of the connecting section (52); and the second groove (23) is formed on the inner wall of the sealing section (53).

8. The pagoda joint structure according to claim 7, characterized in that: The inner diameter of the sealing section (53) is smaller than the inner diameter of the connecting section (52) to form a step (54), and the step (54) abuts against the end of the external hose (60).

9. The pagoda joint structure according to claim 8, characterized in that: Along the axial direction of the connecting pipe (10), the distance between the middle position of the second groove (23) and the step (54) is L2, and the value range of L2 is: 10mm≤L2≤15mm.

10. The pagoda joint structure according to claim 1, characterized in that: The connecting pipe (10) comprises a connecting pipe head (12), a plurality of the pagoda cones (11) are arranged at one end of the connecting pipe (10), the connecting pipe head (12) is arranged at the other end of the connecting pipe (10), and the connecting pipe head (12) is located outside the external hose (60).

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