Water heater

Abstract

This application provides a water heater, comprising: a first inner tank, the first inner tank including a first tank body and a first connecting pipe, the first connecting pipe protruding from the outside of the first tank body and communicating with the inner cavity of the first tank body; and a first connector, the first connector being sleeved on the outer periphery of the first connecting pipe, and the first connector's rotational freedom being restricted by the first tank body and / or the first connecting pipe. Because the first connector's rotational freedom is restricted by the first tank body and / or the first connecting pipe, the first connector will not undergo rotational displacement during the screwing of other components, thus facilitating screwing.

Description

Technical Field

[0001] This application belongs to the field of electric water heater technology, and specifically relates to a water heater. Background Technology

[0002] Storage-type electric water heaters are an indispensable appliance in modern homes. In related technologies, the inner tank is equipped with a connector for screwing other connections. However, during the screwing process, the connector is prone to rotational displacement under strong twisting, leading to difficulties in screwing. Utility Model Content

[0003] This application provides a water heater that can avoid rotational displacement during the process of screwing the first connector into other components.

[0004] The water heater includes: A first inner liner, the first inner liner comprising a first liner body and a first connecting tube, the first connecting tube protruding from the outer side of the first liner body and communicating with the inner cavity of the first liner body; and The first connector is sleeved on the outer periphery of the first connecting pipe, and the first connector's rotational freedom is restricted by the first bladder and / or the first connecting pipe.

[0005] In one embodiment, the first connector includes a first base and a first tube body that are fixedly connected. Both the first base and the first tube body are hollow structures and are fitted around the outer periphery of the first connecting tube. The cross-sectional shape of the first base is non-circular. The first inner liner is provided with a first groove, the first connecting pipe protrudes into the first groove, the shape of the first groove matches the shape of the first base, and the first base is disposed in the first groove.

[0006] In one embodiment, the first connector includes a first base and a first tube body that are fixedly connected, both of which are hollow structures; The first inner liner is provided with a first protrusion, the first connecting pipe protrudes from the first protrusion, the cross-sectional shape of the first protrusion is non-circular, the shape of the inner cavity of the first base matches the shape of the first protrusion, and the first base is sleeved on the outer periphery of the first protrusion, and the first tube body is sleeved on the outer periphery of the first connecting pipe.

[0007] In one embodiment, the water heater further includes a wrapping layer that is wrapped around the outside of the first inner tank and covers the first base.

[0008] In one embodiment, the first connector and the first connecting pipe are connected as an inseparable unit.

[0009] In one embodiment, the water heater further includes: The second inner liner includes a second liner body and a second connecting pipe. The second connecting pipe protrudes from the outside of the second liner body and connects to the inner cavity of the second liner body. The second connector includes a second base and a second tube body. The second tube body is rotatably connected to the second base. Both the second base and the second tube body are hollow structures. The second base is disposed on the second inner liner and its rotational freedom is restricted by the second liner body. The second tube body is sleeved on the outer periphery of the second connecting pipe and screwed to the first connector.

[0010] In one embodiment, the water heater further includes a sealing ring, which is at least partially disposed between the first connecting pipe and the second connecting pipe for sealing.

[0011] In one embodiment, the second tube body and the first connector are welded together to form a seal.

[0012] In one embodiment, the second inner liner is provided with a second groove, the second connecting pipe protrudes into the second groove, the shape of the second groove matches the shape of the second base, and the second base is disposed in the second groove.

[0013] In one embodiment, the second inner liner is provided with a second protrusion, the second connecting pipe protrudes from the second protrusion, the outer periphery of the second protrusion is non-circular, the shape of the inner cavity of the second base matches the shape of the second protrusion, and the second base is sleeved on the outer periphery of the second protrusion, and the second tube body is sleeved on the outer periphery of the second connecting pipe.

[0014] Compared with the prior art, the beneficial effects of this application are as follows: In the water heater provided in the application, since the first connector's rotational freedom is restricted by the first tank and / or the first connecting pipe, the first connector will not generate rotational displacement during the process of screwing other components into the first connector, thus facilitating the screwing connection. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a (single-tank) water heater provided in one embodiment of this application.

[0017] Figure 2 for Figure 1 The diagram shows the first inner tank of the water heater.

[0018] Figure 3 for Figure 1 The diagram shows the first connector in the water heater.

[0019] Figure 4 for Figure 1 The water heater shown is a cross-sectional view with the hidden wrapping layer.

[0020] Figure 5 for Figure 4 An enlarged view of area A in the water heater shown.

[0021] Figure 6 This is a schematic diagram showing that the first inner liner has a first protrusion.

[0022] Figure 7 for Figure 5 The diagram shows a structure with an encapsulating layer.

[0023] Figure 8 This is a schematic diagram of a (dual-tank) water heater provided in another embodiment of this application.

[0024] Figure 9 for Figure 8 The water heater shown is a cross-sectional view with the hidden wrapping layer.

[0025] Figure 10 for Figure 9 An enlarged view of area B in the water heater shown.

[0026] Figure 11 for Figure 10 Diagram showing the fit between the second inner liner and the second connector.

[0027] Figure 12 This is a schematic diagram showing a second protrusion on the second inner liner.

[0028] Explanation of key figure labels: Water heater 100; first inner tank 11; first tank body 111; first connecting pipe 112; first boss 113; first groove X1; first connector 12; first base 121; first pipe body 122; wrapping layer 13; second inner tank 14; second tank body 141; second connecting pipe 142; second boss 143; second groove X2; second connector 15; second base 151; second pipe body 152; sealing ring 16; inlet pipe 17; outlet pipe 18. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0031] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0032] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0033] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0034] The technical solution of this application will be further described below with reference to the embodiments and accompanying drawings.

[0035] Please refer to Figures 1 to 3 This application provides a water heater 100 for heating cold water to a set temperature to provide users with a continuous and stable supply of hot water. This water heater 100 can also be referred to as an electric water heater 100.

[0036] The water heater 100 includes a first inner tank 11 and a first connector 12. The first inner tank 11 includes a first tank body 111 and a first connecting pipe 112. The first connecting pipe 112 protrudes from the outside of the first tank body 111 and communicates with the inner cavity of the first tank body 111. The first connector 12 is sleeved on the outer periphery of the first connecting pipe 112, and the rotational freedom of the first connector 12 is restricted by the first tank body 111 and / or the first connecting pipe 112.

[0037] Specifically, the first inner liner 11 is a container for storing water, the first tank body 111 is the main body of the first inner liner 11, and the first connecting pipe 112 is a hollow tubular structure disposed on the first inner liner 11, connecting the internal space of the first tank body 111. In some embodiments, a pipe body can be inserted into the first connecting pipe 112, which can be a water inlet pipe 17 or a water outlet pipe 18, such as... Figure 4 As shown.

[0038] The first connector 12 is fitted onto the first connecting pipe 112. The first connector 12 is used to screw other components (such as water pipes or connectors). Taking the water pipe as an example, when the first connector 12 is screwed onto the water pipe, the water pipe is connected to the first inner tank 111 through the first connecting pipe 112, so that the first inner tank 11 can have water entering or exiting through the water pipe.

[0039] The first inner tube 111 and / or the first connecting tube 112 will restrict the rotational freedom of the first connector 12 around the first connecting tube 112. That is, under the action of the first inner tube 111 and / or the first connecting tube 112, the first connector 12 cannot rotate around the first connecting tube 112.

[0040] In one embodiment, the first connector 12 restricts the rotational degree of freedom by the first inner tube 111.

[0041] In another embodiment, the first connector 12 restricts the rotational degree of freedom through the first connecting pipe 112.

[0042] In another embodiment, the first connector 12 restricts the degree of rotational freedom through the first inner tube 111 and the first connecting pipe 112.

[0043] In the water heater 100 provided in the application, since the first connector 12 is restricted in its rotational freedom by the first tank body 111 and / or the first connecting pipe 112, the first connector 12 will not generate rotational displacement during the process of screwing other components, which is conducive to achieving screwing.

[0044] The first method of restricting the rotational degree of freedom of the first joint: restricting the rotational degree of freedom through the first chamber. In one embodiment, please refer to Figure 4 and Figure 5 The first connector 12 includes a first base 121 and a first tube 122 fixedly connected together. Both the first base 121 and the first tube 122 are hollow structures and are fitted around the outer periphery of the first connecting tube 112. The cross-sectional shape of the first base 121 is non-circular. "Non-circular" means not circular.

[0045] The first inner liner 11 is provided with a first groove X1, and the first connecting pipe 112 protrudes into the first groove X1. The shape of the first groove X1 matches the shape of the first base 121, that is, the first groove X1 and the first base 121 have the same shape. The first base 121 is disposed in the first groove X1.

[0046] The cross-sectional shape of the first base 121 may be, but is not limited to, an ellipse, a triangle, a quadrilateral, a pentagon, a D-shape, etc. Correspondingly, the shape of the first groove X1 may be, but is not limited to, an ellipse, a triangle, a quadrilateral, a pentagon, a hexagon, a D-shape, etc.

[0047] For example, if the cross-sectional shape of the first base 121 is elliptical, then the first groove X1 is an elliptical groove, so that the first base 121 can be placed in the first groove X1.

[0048] For example, if the cross-sectional shape of the first base 121 is hexagonal, then the first groove X1 is a hexagonal groove so that the first base 121 can be placed in the first groove X1.

[0049] It is understandable that since the cross-sectional shape of the first base 121 is not circular, and the shape of the first groove X1 matches the shape of the first base 121, when the first base 121 is placed in the first groove X1, the first groove X1 will hinder the rotation of the first base 121, thereby restricting the rotational freedom of the first base 121.

[0050] In one embodiment, please refer to Figure 6 The first connector 12 includes a first base 121 and a first tube 122 that are fixedly connected, and both the first base 121 and the first tube 122 are hollow structures.

[0051] The first inner liner 11 has a first protrusion 113, which protrudes from the first liner body 111. The first connecting pipe 112 protrudes from the first protrusion 113. The cross-sectional shape of the first protrusion 113 is non-circular. "Non-circular" means not perfectly circular. The shape of the inner cavity of the first base 121 matches the shape of the first protrusion 113; that is, the shape of the inner cavity of the first base 121 is the same as the shape of the first protrusion 113. The first base 121 is fitted around the outer periphery of the first protrusion 113. The first pipe body 122 is fitted around the outer periphery of the first connecting pipe 112.

[0052] The cross-sectional shape of the first protrusion 113 may be, but is not limited to, elliptical, triangular, quadrilateral, pentagonal, D-shaped, etc. Correspondingly, the shape of the inner cavity of the first base 121 may be, but is not limited to, elliptical, triangular, quadrilateral, pentagonal, hexagonal, D-shaped, etc.

[0053] For example, if the cross-sectional shape of the first boss 113 is elliptical, then the inner cavity of the first base 121 is also elliptical, so that the first boss 113 can be placed in the elliptical inner cavity of the first base 121.

[0054] For example, if the cross-sectional shape of the first boss 113 is hexagonal, then the inner cavity of the first base 121 is also hexagonal, so that the first boss 113 can be placed in the hexagonal inner cavity of the first base 121.

[0055] It is understandable that since the cross-sectional shape of the first boss 113 is not circular, and the shape of the inner cavity of the first base 121 matches the shape of the first boss 113, when the first base 121 and the first boss 113 are engaged, the first boss 113 will hinder the rotation of the first base 121, thereby restricting the rotational freedom of the first base 121.

[0056] In one embodiment, please refer to Figure 1 and Figure 7 The water heater 100 also includes a wrapping layer 13, which is wound around the outside of the first inner tank 11. Wrapping the wrapping layer 13 around the outside of the first inner tank 11 effectively increases the structural strength of the first inner tank 11, giving it greater resistance to deformation. The wrapping layer 13 can be, but is not limited to, glass fiber, which can be impregnated with epoxy resin. For a water heater 100 with a wrapping layer 13, its first inner tank 11 can be made of plastic (e.g., PB material). Plastic first inner tanks have advantages such as light weight and low cost. The wrapping layer 13 can prevent the mechanical properties of the plastic first inner tank 11 from significantly decreasing after being exposed to high temperatures, thus ensuring its strength meets usage requirements.

[0057] The wrapping layer 13 also covers the first base 121 (see...). Figure 7 This design effectively secures the first base 121 to the first inner liner 11, preventing it from easily falling off.

[0058] The first tube 122 is exposed outside the wrapping layer 13, that is, the first tube 122 is not wrapped or covered. This arrangement facilitates the screwing of other components through the first tube 122.

[0059] It should be noted that, Figure 7 The wrapping layer 13 shown is only Figure 1 The simplified representation of the encapsulation layer 13 shown is intended for ease of understanding.

[0060] The second method of restricting the rotational degree of freedom of the first joint: restricting the rotational degree of freedom through the first connecting pipe. In one embodiment, the first connector 12 and the first connecting pipe 112 are connected as an inseparable unit. The first connecting pipe 112 can be inserted into the first connector 12 by blow molding, or connected to the first connector 12 by hot melting, ultrasonic welding, or other methods to form an inseparable unit. It is understood that after the first connector 12 and the first connecting pipe 112 are integrated, the first connector 12 cannot rotate relative to the first connecting pipe 112, thereby restricting the rotational freedom of the first connector 12.

[0061] The above are two forms of restricting the rotational degrees of freedom of the first joint 12. It can be understood that, provided there is no contradiction, the above two forms can also be combined.

[0062] In one embodiment, the first inner liner 11 and the first connecting pipe 112 are integrally formed. That is, the first inner liner 11 and the first connecting pipe 112 are integrally formed. Integral forming avoids assembly gaps between the two, thereby ensuring a better sealing effect and reducing the use of sealing components.

[0063] It should be noted that the water heater 100 provided in this application may have only one inner tank, the first inner tank 11. In other embodiments, in addition to the first inner tank 11, it may include more inner tanks. The following description takes the inclusion of a second inner tank 14 as an example.

[0064] In one embodiment, please refer to Figures 8 to 11The water heater 100 further includes: a second inner tank 14 and a second connector 15. The second inner tank 14 includes a second tank body 141 and a second connecting pipe 142, the second connecting pipe 142 protruding from the outside of the second tank body 141 and communicating with the inner cavity of the second tank body 141. The second connector 15 includes a second base 151 and a second pipe body 152, the second pipe body 152 being rotatably connected to the second base 151. Both the second base 151 and the second pipe body 152 are hollow structures. The second base 151 is disposed on the second inner tank 14 and its rotational freedom is restricted by the second tank body 141. The second pipe body 152 is sleeved on the outer periphery of the second connecting pipe 142 and screwed to the first pipe body 122 of the first connector 12.

[0065] Specifically, the second inner liner 14 is a container for storing water, the second liner body 141 is the main body of the second inner liner 14, and the second connecting pipe 142 is a hollow tubular structure disposed on the second inner liner 14, which connects to the internal space of the second liner body 141.

[0066] The second tube body 152 is threaded, and the first tube body 122 of the first connector 12 is also threaded. The second tube body 152 and the first tube body 122 are connected by the threads. Since the second base 151 is restricted in its rotational freedom by the second inner tube 141, and the second tube body 152 is rotatably connected to the second base 151, the second tube body 152 can rotate relative to the second base 151 and thus screw together with the first tube body 122 of the first connector 12.

[0067] It should be noted that, in one embodiment, the thread on the first tube 122 is an external thread, and correspondingly, the thread on the second tube 152 is an internal thread, with the first tube 122 screwed into the second tube 152 via the thread. In another embodiment, the thread on the first tube 122 is an internal thread, and correspondingly, the thread on the second tube 152 is an external thread, with the second tube 152 screwed into the first tube 122 via the thread.

[0068] In one embodiment, please refer to Figure 10 The water heater 100 also includes a sealing ring 16, which is at least partially disposed between the first connecting pipe 112 and the second connecting pipe 142 for sealing. That is, by providing the sealing ring 16, the gap between the first connecting pipe 112 and the second connecting pipe 142 can be sealed, preventing water leakage when it flows through. The sealing ring 16 can be elastic, better filling gaps and improving the sealing effect. The material of the sealing ring 16 can be, but is not limited to, rubber. In one embodiment, the sealing ring 16 is fitted around the outer periphery of the inlet pipe 17 or the outlet pipe 18.

[0069] In one embodiment, the second tube 152 and the first tube 122 are welded together circumferentially to achieve a seal. It is understood that by welding circumferentially, the gap between the first tube 122 and the second tube 152 can be eliminated, thereby isolating the internal spaces of the first tube 122 and the second tube 152 from the outside. Therefore, a sealing effect can also be achieved by circumferentially welding the second tube 152 and the first tube 122.

[0070] In one embodiment, please refer to Figure 10 and Figure 11 The second inner liner 14 has a second groove X2, and the second connecting pipe 142 protrudes into the second groove X2. The cross-sectional shape of the second base 151 is non-circular. "Non-circular" means not circular. The shape of the second groove X2 matches the shape of the second base 151; that is, the second groove X2 and the second base 151 have the same shape. The second base 151 is disposed within the second groove X2.

[0071] The cross-sectional shape of the second base 151 may be, but is not limited to, an ellipse, a triangle, a quadrilateral, a pentagon, a D-shape, etc. Correspondingly, the shape of the second groove X2 may be, but is not limited to, an ellipse, a triangle, a quadrilateral, a pentagon, a hexagon, a D-shape, etc.

[0072] For example, if the cross-sectional shape of the second base 151 is elliptical, then the second groove X2 is an elliptical groove, so that the second base 151 can be placed exactly in the second groove X2.

[0073] For example, if the cross-sectional shape of the second base 151 is hexagonal, then the second groove X2 is a hexagonal groove so that the second base 151 can be placed in the second groove X2.

[0074] It is understandable that since the cross-sectional shape of the second base 151 is not circular, and the shape of the second groove X2 matches the shape of the second base 151, when the second base 151 is placed in the second groove X2, the second groove X2 will hinder the rotation of the second base 151, thereby restricting the rotational freedom of the second base 151.

[0075] In one embodiment, please refer to Figure 12The second inner liner 14 is provided with a second protrusion 143, which protrudes from the second liner body 141. The second connecting pipe 142 protrudes from the second protrusion 143. The cross-sectional shape of the second protrusion 143 is non-circular. The shape of the inner cavity of the second base 151 matches the shape of the second protrusion 143, that is, the shape of the inner cavity of the first base 121 is the same as the shape of the first protrusion 113. The second base 151 is fitted around the outer periphery of the second protrusion 143, and the second pipe body 152 is fitted around the outer periphery of the second connecting pipe 142.

[0076] The cross-sectional shape of the second protrusion 143 may be, but is not limited to, elliptical, triangular, quadrilateral, pentagonal, D-shaped, etc. Correspondingly, the shape of the inner cavity of the second base 151 may be, but is not limited to, elliptical, triangular, quadrilateral, pentagonal, hexagonal, D-shaped, etc.

[0077] For example, if the cross-sectional shape of the second boss 143 is elliptical, then the inner cavity of the second base 151 is also elliptical, so that the second boss 143 can be placed in the elliptical inner cavity of the second base 151.

[0078] For example, if the cross-sectional shape of the second boss 143 is hexagonal, then the inner cavity of the second base 151 is also hexagonal, so that the second boss 143 can be placed in the hexagonal inner cavity of the second base 151.

[0079] It is understandable that since the cross-sectional shape of the second boss 143 is not circular, and the shape of the inner cavity of the second base 151 matches the shape of the second boss 143, when the second base 151 and the second boss 143 are engaged, the second boss 143 will hinder the rotation of the second base 151, thereby restricting the rotational freedom of the second base 151.

[0080] The technical means disclosed in this application are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principles of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

Claims

1. A water heater, characterized in that, The water heater (100) includes: A first inner liner (11) includes a first liner body (111) and a first connecting pipe (112), the first connecting pipe (112) protruding from the outside of the first liner body (111) and communicating with the inner cavity of the first liner body (111); and The first connector (12) is sleeved on the outer periphery of the first connecting pipe (112), and the first connector (12) is restricted in its rotational freedom by the first bladder (111) and / or the first connecting pipe (112).

2. The water heater as described in claim 1, characterized in that, The first connector (12) includes a first base (121) and a first tube (122) fixedly connected. The first base (121) and the first tube (122) are both hollow structures and are both sleeved on the outer periphery of the first connecting tube (112). The cross-sectional shape of the first base (121) is non-circular. The first inner liner (11) is provided with a first groove (X1), and the first connecting pipe (112) protrudes into the first groove (X1). The shape of the first groove (X1) matches the shape of the first base (121), and the first base (121) is provided in the first groove (X1).

3. The water heater as described in claim 1, characterized in that, The first connector (12) includes a first base (121) and a first tube (122) that are fixedly connected. Both the first base (121) and the first tube (122) are hollow structures. The first inner liner (11) is provided with a first protrusion (113), the first connecting pipe (112) protrudes from the first protrusion (113), the cross-sectional shape of the first protrusion (113) is non-circular, the shape of the inner cavity of the first base (121) matches the shape of the first protrusion (113), and the first base (121) is sleeved on the outer periphery of the first protrusion (113), and the first pipe body (122) is sleeved on the outer periphery of the first connecting pipe (112).

4. The water heater as described in claim 2 or 3, characterized in that, The water heater (100) also includes a wrapping layer (13) which is wrapped around the outside of the first inner tank (11) and covers the first base (121).

5. The water heater as described in claim 1, characterized in that, The first connector (12) and the first connecting pipe (112) are connected as an inseparable whole.

6. The water heater as described in claim 1, characterized in that, The water heater (100) also includes: The second inner liner (14) includes a second liner body (141) and a second connecting pipe (142). The second connecting pipe (142) protrudes from the outside of the second liner body (141) and connects to the inner cavity of the second liner body (141). The second connector (15) includes a second base (151) and a second tube (152). The second tube (152) is rotatably connected to the second base (151). Both the second base (151) and the second tube (152) are hollow structures. The second base (151) is set on the second inner liner (14) and its rotational freedom is restricted by the second liner (141). The second tube (152) is sleeved on the outer periphery of the second connecting pipe (142) and screwed to the first connector (12).

7. The water heater as described in claim 6, characterized in that, The water heater (100) also includes a sealing ring (16), which is at least partially disposed between the first connecting pipe (112) and the second connecting pipe (142) for sealing.

8. The water heater as described in claim 6, characterized in that, The second tube (152) and the first connector (12) are welded together to form a seal.

9. The water heater as described in claim 6, characterized in that, The second inner liner (14) is provided with a second groove (X2), and the second connecting pipe (142) protrudes into the second groove (X2). The shape of the second groove (X2) matches the shape of the second base (151), and the second base (151) is provided in the second groove (X2).

10. The water heater as described in claim 6, characterized in that, The second inner liner (14) is provided with a second protrusion (143), the second connecting pipe (142) protrudes from the second protrusion (143), the outer periphery of the second protrusion (143) is non-circular, the shape of the inner cavity of the second base (151) matches the shape of the second protrusion (143), and the second base (151) is sleeved on the outer periphery of the second protrusion (143), and the second pipe body (152) is sleeved on the outer periphery of the second connecting pipe (142).

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