Metal-coated hose convenient for perforation installation and used for gas appliance connection

Abstract

The utility model discloses a gas appliance connection metal cladding flexible pipe convenient for perforation installation, which comprises a flexible pipe body, a connecting nut and a connecting joint, the rear end of the connecting joint is fixedly connected to the flexible pipe body, the connecting nut is movably sleeved outside the connecting joint, the rear end of the connecting nut is provided with a convex ring, and the convex ring is connected with the flexible pipe body. A clamping groove used for installing the clamping ring is formed in the front end of the connecting joint, the connecting nut is axially limited between the hose body and the clamping ring, the clamping ring abuts against the protruding ring, and an axial gap enabling the connecting nut to axially move relative to the connecting joint is formed between the rear end of the connecting nut and the front end of the hose body. When the connecting nut gets close to the front end of the hose body along the axial gap, the clamping groove can stretch out of the front end of the connecting nut. And detachable connection of the connecting nut is achieved through the arrangement of the clamping ring, after the connecting nut is detached, the metal-coated hose can penetrate through the protective sleeve pre-buried in the wall, installation is convenient, and the practicability of the metal-coated hose is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hoses, in particular to a metal-clad hose for connecting gas appliances which is convenient for perforation installation. Background Art

[0002] At present, there are three main types of hoses for connecting gas stoves in China: stainless steel corrugated hoses, rubber hoses or composite hoses. Rubber hoses or composite hoses with metal protective layers are also called metal-coated hoses. Stainless steel corrugated hoses are suitable for fixed gas stoves and other gas appliances; rubber hoses, composite hoses and metal-coated hoses are mainly suitable for fixed and non-fixed gas stoves and other gas appliances.

[0003] The metal-clad hose consists of three main layers, including a plastic sheath, a metal sheath and a gas hose, which can effectively prevent corrosion and resist damage such as external impact, thereby ensuring the safe use of gas appliances. As a new type of gas pipe connecting gas appliances, the metal-clad hose is suitable for fixed and non-fixed gas cookers, and the cost can be effectively controlled. Since the product was promoted, it has been widely accepted by users. For example, a threaded armored metal sheathed hose for gas and an assembly method thereof are disclosed in a Chinese invention patent (publication number: CN117967894A), which includes an inner tube and an armored metal outer tube sleeved outside the inner tube, and a connector arranged at the end of the pipe, wherein the connector includes a joint and an inner pressure sleeve for connecting the inner tube to the joint, and also includes an outer pressure sleeve for connecting the armored metal outer tube to the joint, wherein the outer pressure sleeve includes a buckling area and a clamping area, wherein the inner wall of the clamping area is provided with a threaded protrusion, wherein the threaded protrusion is adapted to a threaded groove on the surface of the armored metal outer tube, wherein the joint includes a tube core and a flange, wherein the tube core and the flange are integrally formed, and further includes a connecting nut sleeved on the outside of the flange. By setting the outer pressure sleeve into a buckling area and a clamping area, wherein the inner wall of the clamping area is provided with a threaded protrusion, the threaded protrusion is matched with the groove on the surface of the armored metal outer tube. When subjected to a large tensile force, the tensile force exerted on the armored metal outer tube will be dispersed to the outer pressure sleeve through the interaction of forces between the threaded protrusion and the side wall of the groove on the surface of the armored metal outer tube. The outer pressure sleeve bears part of the tensile force, thereby improving the tensile resistance of the armored metal outer tube.

[0004] However, the above-mentioned prior art discloses a threaded armored metal sheathed hose for gas and its assembly method, in which the tube core and the flange are integrally formed, and a connecting nut is sleeved on the outer side of the flange. This connection method makes it impossible to remove the connecting nut from the metal sheathed hose, so that the outer diameter of the joint will be larger than the inner diameter of the sheath pipe 100 embedded in the wall, resulting in the inability to achieve concealed sealing and perforation, which seriously affects the installation and aesthetics, and causes great trouble to the promotion and use of the product.

[0005] Therefore, it is necessary to improve the existing technology. Utility Model Content

[0006] The purpose of the utility model is to address the defects and shortcomings of the prior art and to provide a metal-clad hose for connecting gas appliances that is easy to perforate and install. The joint is easy to disassemble. After removing the connecting nut, the metal-clad hose can pass through the pre-buried sheath pipe in the wall, which is easy to install.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A metal-clad hose for connecting gas appliances that is easy to install through holes, comprises a hose body, a connecting nut and a connecting joint, the rear end of the connecting joint is fixedly connected to the hose body, the connecting nut is movably sleeved on the outside of the connecting joint, the rear end of the connecting nut is provided with a convex ring, the front end of the connecting joint is provided with a groove for installing a clamping ring, the connecting nut is axially limited between the hose body and the clamping ring, the clamping ring abuts against the convex ring, an axial gap is formed between the rear end of the connecting nut and the front end of the hose body to enable the connecting nut to move axially relative to the connecting joint, and when the connecting nut approaches the front end of the hose body along the axial gap, the groove can extend from the front end of the connecting nut.

[0009] Furthermore, the connecting joint includes a clamping portion and a buckle portion, the front end of the clamping portion extends into the interior of the connecting nut, the clamping groove is arranged on the clamping portion, the buckle portion extends into the front end of the hose body, and a channel for the fluid medium to pass through is opened inside the connecting joint.

[0010] Furthermore, it also includes a clamping steel sleeve, which is arranged on the outer peripheral wall of the front end of the hose body, and the clamping steel sleeve includes a buckling part and an umbrella-shaped part.

[0011] Furthermore, the outer peripheral wall of the buckling portion is integrally provided with a plurality of inverted cone rings along the axial direction.

[0012] Furthermore, a retaining ring extending toward the axis of the compression steel sleeve is provided at the front end of the compression steel sleeve, and the retaining ring cooperates with the front end stopper of the hose body.

[0013] Furthermore, a sealing ring is installed on a side of the clamping ring away from the convex ring, and an annular groove is provided on a side of the sealing ring close to the connecting joint.

[0014] Furthermore, the clamping ring is composed of two half clamping rings whose ends are integrally connected, and a V-shaped notch is provided on the inner side of the connection between the two half clamping rings.

[0015] Furthermore, the clamping ring is made of metal.

[0016] Furthermore, the hose body includes a gas hose, a metal mesh sleeve covering the outer surface of the hose, and a plastic sheath covering the outer surface of the metal mesh sleeve.

[0017] Furthermore, when the compression steel sleeve is buckled, the rubber hose is squeezed so that an inverted cone groove matching the inverted cone ring is formed on its inner circumferential wall.

[0018] After adopting the above structure, the utility model has the following beneficial effects:

[0019] (1) The utility model discloses a metal-clad hose for connecting gas appliances that is easy to install by perforation, comprising a hose body, a connecting nut and a connecting joint. The rear end of the connecting joint is fixedly connected to the hose body, the connecting nut is movably sleeved on the outside of the connecting joint, the rear end of the connecting nut is provided with a convex ring, the front end of the connecting joint is provided with a groove for installing a clamping ring, and the connecting nut is axially limited between the hose body and the clamping ring. The setting of the clamping ring can realize the detachable connection of the connecting nut. After the connecting nut is removed, the metal-clad hose can pass through the pre-buried sheath pipe in the wall, which is easy to install and greatly improves its practicality.

[0020] (2) The utility model discloses a metal-clad hose for connecting a gas appliance that is easy to install by punching. The clamp ring is composed of two half-clamp rings with their ends integrally connected, and a V-shaped notch is provided on the inner side of the connection between the two half-clamp rings. The clamp ring is composed of two half-clamp rings with their ends integrally connected. The integral setting can effectively prevent the loss of the half-clamp rings and also makes the installation operation more convenient. During installation, the two half-clamp rings are pressed together and closed to form a full circle through the V-shaped notch at the connection. After forming a full circle, the clamp ring is tightly clamped to the clamping groove of the clamping part, which increases the pulling force at the connection between the hose body and the connecting nut. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the utility model, the following is a brief introduction to the drawings required for use in the description of the specific implementation methods. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 The utility model Figure 1 A schematic diagram of the structure at A;

[0024] Figure 3 It is a schematic diagram of the matching connection of the hose body, the connecting joint and the compression steel sleeve of the utility model;

[0025] Figure 4 is a cross-sectional view of the connecting joint of the present utility model;

[0026] Figure 5 is a schematic structural diagram of the snap ring of the present utility model;

[0027] Figure 6 is a cross-sectional view of the connecting nut of the present utility model;

[0028] Figure 7 is a cross-sectional view of the sealing ring of the present utility model;

[0029] Figure 8 is a schematic diagram of the installation process of the present utility model (installing the connecting nut and the snap ring).

[0030] Figures 1 to 8 The reference numerals in the figure are:

[0031] 1. Hose body; 11. Rubber hose; 111. Inverted cone groove; 12. Metal mesh sleeve; 13. Plastic sheath; 2. Connecting nut; 21. Convex ring; 3. Connecting joint; 31. Clamping part; 311. Card slot; 32. Buckling part; 321. Inverted cone ring; 33. Channel; 4. Snap ring; 41. Half snap ring; 42. V-shaped notch; 5. Compression steel sleeve; 51. Crimping part; 52. Umbrella-shaped part; 53. Retaining ring; 6. Sealing ring; 61. Annular groove; 100. Protective sleeve. Detailed implementation manners

[0032] In order to make the above objects, features, and advantages of the present utility model more comprehensible, the following will describe in detail the specific implementation manners of the present utility model with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0033] In the description of the present utility model, it should be understood that if there appear such terms as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

[0034] In addition, if the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, if the term "a plurality of" appears, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0035] In the present utility model, unless otherwise clearly specified and defined, if terms such as "installed", "connected", "joined", "fixed", etc. appear, these terms shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. 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.

[0036] In the present utility model, unless otherwise clearly specified and defined, if there is a description such as a first feature being "on" or "under" a second feature, the meaning may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0037] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present utility model are only for the purpose of illustration and do not represent the only implementation manner.

[0038] It should be noted that, without conflict, the embodiments and features in the embodiments of the present utility model may be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0039] As Figures 1 to 8As shown in the figure, a metal-clad hose for connecting gas appliances that is convenient for perforation installation includes a hose body 1, a connecting nut 2, and a connecting joint 3. The rear end of the connecting joint 3 is fixedly connected to the hose body 1. The connecting nut 2 is movably sleeved outside the connecting joint 3. A convex ring 21 is provided at the rear end of the connecting nut 2. A clamping groove 311 for installing a clamping ring 4 is provided at the front end of the connecting joint 3. The connecting nut 2 is axially limited between the hose body 1 and the clamping ring 4. The clamping ring 4 abuts against the convex ring 21. An axial gap is formed between the rear end of the connecting nut 2 and the front end of the hose body 1, enabling the connecting nut 2 to axially move relative to the connecting joint 3. When the connecting nut 2 approaches the front end of the hose body 1 along the axial gap, the clamping groove 311 can extend out from the front end of the connecting nut 2. The connecting joint 3 includes a clamping portion 31 and a buckling portion 32. The front end of the clamping portion 31 extends into the inside of the connecting nut 2. The clamping groove 311 is provided in the clamping portion 31. The buckling portion 32 extends into the front end of the hose body 1. A channel 33 for fluid medium to pass through is provided inside the connecting joint 3.

[0040] Based on the above embodiments, the present invention aims to provide a metal-clad hose for connecting gas appliances that is convenient for perforation installation, including a hose body 1, a connecting nut 2, and a connecting joint 3. The rear end of the connecting joint 3 is fixedly connected to the hose body 1. The connecting nut 2 is movably sleeved outside the connecting joint 3. A convex ring 21 is provided at the rear end of the connecting nut 2. A clamping groove 311 for installing a clamping ring 4 is provided at the front end of the connecting joint 3. The connecting nut 2 is axially limited between the hose body 1 and the clamping ring 4. By providing the clamping ring 4, the detachable connection of the connecting nut 2 can be achieved. After removing the connecting nut 2, the metal-clad hose can pass through the protective sleeve 100 embedded in the wall, which is convenient for installation and greatly improves its practicality. In this embodiment, for better description, the distance from the end of the clamping portion 31 to the front end of the pressing steel sleeve 5 is named H1, and the width of the connecting nut 2 is named H2. As Figure 8 shown, H1 is greater than H2, so that when the connecting nut 2 approaches the front end of the hose body 1 along the axial gap, the clamping groove 311 can extend out from the front end of the connecting nut 2.

[0041] During specific installation, move the connecting nut 2 along the axial gap towards the front end of the hose body 1 so that the clamping groove 311 can extend out from the front end of the connecting nut 2. Remove the clamping ring 4 from the clamping groove 311, and then remove the connecting nut 2 from the connecting joint 3. At this time, the state of the product is as Figure 3As shown in the figure; then pass the metal-clad hose after removing the connecting nut 2 and the snap ring 4 through the protective sleeve 100, then sleeved the connecting nut 2 on the front end of the hose body 1, and move the connecting nut 2 backward until the card slot 311 extends out of the front end of the connecting nut 2, and snap the snap ring 4 into the card slot 311. At this time, the state of the product is as shown in Figure 8 As shown in the figure; then move the connecting nut 2 forward until the snap ring 4 abuts against the convex ring 21, then install the sealing ring 6 into the connecting nut 2 and fit it with the snap ring 4. At this time, the state of the product is as shown in Figure 1 As shown in the figure; finally, connect with other gas appliances, valves or pipe fittings through the connecting nut 2, thus realizing the rapid perforation installation of the metal-clad hose.

[0042] As another preferred solution of the present invention, it further includes a compression steel sleeve 5, and the compression steel sleeve 5 is arranged on the outer peripheral wall of the front end of the hose body 1. The compression steel sleeve 5 includes a crimping portion 51 and an umbrella-shaped portion 52. In this embodiment, as shown in Figure 3 and Figure 4 As shown in the figure, insert the buckling portion 32 into the front end of the hose body 1, then sleeved the compression steel sleeve 5 on the overlapping part of the buckling portion 32 and the hose body 1, and crimp the compression steel sleeve 5 through a crimping machine. The compression steel sleeve 5 is deformed under force, and the inner diameter of the compressed part is reduced, thereby squeezing the hose body 1 to deform and closely adhere to the surface of the buckling portion 32, thereby forming an external crimping, so that the hose body 1, the connecting joint 3 and the compression steel sleeve 5 are fixedly connected together. The force-deformed part of the compression steel sleeve 5 forms a crimping portion 51, and an umbrella-shaped portion 52 is formed at the rear end of the compression steel sleeve 5 located at the crimping portion 51. The setting of the umbrella-shaped portion 52 can effectively prevent the compression steel sleeve 5 from cutting the hose body 1.

[0043] As another preferred solution of the present invention, a plurality of inverted cone rings 321 are integrally arranged along the axial direction on the outer peripheral wall of the buckling portion 32. When the compression steel sleeve 5 is crimped, the rubber hose 11 forms inverted cone grooves 111 adapted to the inverted cone rings 321 on its inner peripheral wall due to being squeezed. In this embodiment, as shown in Figure 3 and Figure 4 As shown in the figure, the rubber hose 11 is deformed by extrusion to better squeeze the surface of the buckling portion 32, so that the connection sealing performance between the hose body 1 and the buckling portion 32 and the crimping portion 51 is better. At the same time, a plurality of inverted cone rings 321 are integrally arranged on the buckling portion 32. When the rubber hose 11 is squeezed to the surface of the buckling portion 32 through the compression steel sleeve 5, the rubber hose 11 forms inverted cone grooves 111 adapted to the inverted cone rings 321 on its inner peripheral wall due to being squeezed. Through the engagement of the inverted cone rings 321 and the inverted cone grooves 111, the pulling force between the rubber hose 11 and the buckling portion 32 is effectively increased, and the situation of the hose body 1 disengaging from the buckling portion 32 is reduced.

[0044] As another preferred embodiment of the present utility model, a retaining ring 53 extending towards the axis of the compression steel sleeve 5 is provided at the front end of the compression steel sleeve 5, and the retaining ring 53 is in stop cooperation with the front end of the hose body 1. In this embodiment, as Figure 2 shown, when the hose body 1 gradually enters the inside of the compression steel sleeve 5, in order to prevent the hose body 1 from entering too much and exceeding the length of the compression steel sleeve 5, the retaining ring 53 is provided. When the hose body 1 moves to contact the retaining ring 53, it can no longer enter the compression steel sleeve 5, playing a positioning role. At the same time, it also protects the end of the hose body 1 and prevents the end of the hose body 1 from being delaminated.

[0045] As another preferred embodiment of the present utility model, a sealing ring 6 is installed on the side of the snap ring 4 away from the convex ring 21, and an annular groove 61 is provided on the side of the sealing ring 6 close to the connecting joint 3. In this embodiment, the sealing ring 6 is made of rubber material. The sealing ring 6 is made of a long-life rubber material, which can make the sealing ring 6 have a long service life, and rubber has the characteristic of deformation, which can better play a sealing role. As Figure 2 and Figure 7 shown, the setting of the annular groove 61 enables the sealing ring 6 to form end face sealing with the end face of the connecting joint 3 and annular surface sealing with the side wall of the connecting joint 3, and the double sealing greatly improves the sealing effectiveness at the joint.

[0046] As another preferred embodiment of the present utility model, the snap ring 4 is composed of two semi-snap rings 41 with integrally connected ends, and a V-shaped notch 42 is provided on the inner side of the connection part of the two semi-snap rings 41. The snap ring 4 is made of metal material. The conventional snap ring 4 in the prior art is generally composed of two split semi-snap rings 41 spliced together. During assembly, the two need to be aligned and spliced and clamped at the clamping position. However, since the snap ring 4 is usually designed to be relatively small, the operation is very inconvenient. Moreover, during the installation process, the semi-snap rings 41 are also likely to be lost, resulting in the metal-clad hose being unable to be installed and used normally. In this embodiment, as Figure 5 shown, the snap ring 4 is composed of two semi-snap rings 41 with integrally connected ends. The integral setting can effectively prevent the loss of the semi-snap rings 41 and also makes the installation operation more convenient. During installation, the two semi-snap rings 41 are compressed, and are closed through the V-shaped notch 42 at the connection part to form a complete circle. After forming a complete circle, the snap ring 4 is clamped at the card slot 311 of the clamping part 31, increasing the pulling force at the connection between the hose body 1 and the connecting nut 2. The snap ring 4 is made of metal material, preferably copper or stainless steel. Copper and stainless steel have strong corrosion resistance and higher hardness compared to plastic materials, which can further increase the pulling force at the connection between the hose body 1 and the connecting nut 2.

[0047] As another preferred solution of the present utility model, the hose body 1 includes a rubber hose 11 for gas, a metal mesh sleeve 12 wrapped around the outer surface of the hose 11, and a plastic sheath 13 wrapped around the outer surface of the metal mesh sleeve 12. In this embodiment, as Figure 1 , Figure 2 shown, compared with the general rubber hose 11 and composite hose 11, the metal-clad hose has increased the strength and anti-destruction performance of the hose body 1 due to the setting of the metal mesh sleeve 12. On the other hand, it can avoid the occurrence of gas leakage accidents caused by being bitten by mice. The setting of the plastic sheath 13 prevents the metal mesh sleeve 12 from being exposed to the air. If the metal mesh sleeve 12 is directly exposed to the air, the surface may be stained with water stains, soy sauce and other items, which is likely to cause oxidation or corrosion of the metal mesh sleeve 12. To protect the metal mesh sleeve 12, the surface of the metal mesh sleeve 12 is wrapped with a plastic sheath 13 to protect the metal mesh sleeve 12 and reduce the damage of the hose body 1. At the same time, the tensile strength of the hose body 1 is further improved.

[0048] Obviously, the above embodiments are only examples given for clear illustration and are not limitations on the implementation manners. 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 enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present utility model.

Claims

1. A metal-clad hose for connecting a gas appliance that is convenient for perforation installation, comprising a hose body (1), a connecting nut (2) and a connecting joint (3), wherein the rear end of the connecting joint (3) is fixedly connected to the hose body (1), the connecting nut (2) is movably sleeved on the outside of the connecting joint (3), and the rear end of the connecting nut (2) is provided with a convex ring (21), characterized in that: The front end of the connecting joint (3) is provided with a retaining groove (311) for mounting a retaining ring (4); the connecting nut (2) is axially limited between the hose body (1) and the retaining ring (4); the retaining ring (4) abuts against the convex ring (21); an axial gap is formed between the rear end of the connecting nut (2) and the front end of the hose body (1) to enable the connecting nut (2) to move axially relative to the connecting joint (3); when the connecting nut (2) approaches the front end of the hose body (1) along the axial gap, the retaining groove (311) can extend from the front end of the connecting nut (2).

2. A metal-clad hose for connecting a gas appliance that is easy to install through a hole according to claim 1, characterized in that: The connecting joint (3) comprises a clamping portion (31) and a buckling portion (32); the front end of the clamping portion (31) extends into the interior of the connecting nut (2); the clamping groove (311) is provided on the clamping portion (31); the buckling portion (32) extends into the front end of the hose body (1); and a channel (33) is provided inside the connecting joint (3) for a fluid medium to pass through.

3. A metal-clad hose for connecting a gas appliance that is easy to install through a hole according to claim 2, characterized in that: It also comprises a clamping steel sleeve (5), the clamping steel sleeve (5) being arranged on the outer peripheral wall of the front end of the hose body (1), the clamping steel sleeve (5) comprising a buckling portion (51) and an umbrella-shaped portion (52).

4. A metal-clad hose for connecting a gas appliance that is easy to install through a hole according to claim 3, characterized in that: The outer peripheral wall of the buckling portion (32) is integrally provided with a plurality of inverted cone rings (321) along the axial direction.

5. A metal-clad hose for connecting a gas appliance that is easy to install through a hole according to claim 3, characterized in that: The front end of the compression steel sleeve (5) is provided with a retaining ring (53) extending towards the axis of the compression steel sleeve (5), and the retaining ring (53) cooperates with the front end stopper of the hose body (1).

6. A metal-clad hose for connecting a gas appliance that is easy to install through a hole according to claim 1, characterized in that: A sealing ring (6) is installed on the side of the clamping ring (4) away from the convex ring (21), and an annular groove (61) is provided on the side of the sealing ring (6) close to the connecting joint (3).

7. A metal-clad hose for connecting a gas appliance that is easy to install through a hole according to claim 1, characterized in that: The clamping ring (4) is composed of two half clamping rings (41) whose ends are integrally connected, and a V-shaped notch (42) is provided on the inner side of the connection between the two half clamping rings (41).

8. A metal-clad hose for connecting a gas appliance that is easy to install through a hole according to claim 1 or 7, characterized in that: The clamping ring (4) is made of metal material.

9. A metal-clad hose for connecting a gas appliance that is easy to install through a hole according to claim 4, characterized in that: The hose body (1) comprises a rubber hose (11) for gas, a metal mesh sleeve (12) covering the outer surface of the rubber hose (11), and a plastic sheath (13) covering the outer surface of the metal mesh sleeve (12).

10. A metal-clad hose for connecting a gas appliance that is easy to install through a hole according to claim 9, characterized in that: When the compression steel sleeve (5) is buckled, the rubber hose (11) is squeezed so that an inverted cone groove (111) matching the inverted cone ring (321) is formed on its inner peripheral wall.

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