Multilayer metal exhaust hose capable of controlling surface temperature

Abstract

The utility model relates to the technical field of exhaust pipelines, and provides a multi-layer metal exhaust hose capable of controlling the surface temperature. The multi-layer metal exhaust hose capable of controlling the surface temperature comprises an inner flexible pipe and an outer flexible pipe, wherein the inner flexible pipe is composed of an inner pipe body and connecting pieces symmetrically and fixedly connected to the two ends of the inner pipe body; the heat insulation rings are clamped on the connecting pieces and are symmetrically arranged about the geometric center of the inner pipe body; the outer side of the inner flexible pipe is coaxially sleeved with the outer flexible pipe, and the two ends of the outer flexible pipe are clamped to the heat insulation rings; the extension pipes are connected with the connecting piece and are symmetrically distributed; the heat insulation ring forms an air gap with a heat insulation function between the inner flexible pipe and the outer flexible pipe. The multi-layer metal exhaust hose capable of controlling the surface temperature can effectively prevent heat in waste gas and flue gas from being transmitted to the surface, and the purpose of controlling the surface temperature is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of exhaust pipes, and in particular to a multi-layer metal exhaust hose for controlling surface temperature. BACKGROUND

[0002] The metal exhaust hose is a metal shock-absorbing flexible pipe applied to exhaust pipes of non-road machinery and vehicles, which mainly comprises an airtight shell, an inner liner and a joint. The airtight shell is a thin-walled stainless steel metal hose with a spiral or annular wave shape, the inner liner is wound by a stainless steel band, and the joint is formed by stamping a stainless steel ring. When the exhaust gas discharged by an engine passes through the hose, a high temperature is generated on the surface of the hose.

[0003] To solve the problem of high surface temperature of the hose, a simple solution in the prior art is to add a heat insulation sleeve to the metal exhaust hose, so as to wrap the hose by the heat insulation sleeve to reduce heat dissipation and lower the surface temperature.

[0004] In actual use, the wrapping structure of the heat insulation sleeve in the prior art cannot move synchronously with the metal exhaust hose, and is prone to wear and tear during long-term use. In addition, the material of the heat insulation sleeve has a short service life, and may be damaged and aged after a period of use, so that the heat insulation effect cannot be guaranteed for a long time, and the safety hazards caused by the high surface temperature of the hose cannot be avoided stably. CONTENT OF THE INVENTION

[0005] Therefore, the present application aims to provide a multi-layer metal exhaust hose for controlling surface temperature to solve the above technical problems and meet the surface temperature control requirements of exhaust pipes.

[0006] To achieve the above purpose, the technical scheme of the present application is as follows:

[0007] A multi-layer metal exhaust hose for controlling surface temperature comprises an inner flexible pipe, which comprises an inner pipe body and connecting pieces symmetrically connected to both ends of the inner pipe body.

[0008] A heat insulation ring is clamped on the connecting pieces and symmetrically arranged about the geometric center of the inner pipe body.

[0009] An outer flexible pipe is coaxially sleeved outside the inner flexible pipe and clamped on the heat insulation ring at both ends.

[0010] Extension pipes are connected to the connecting pieces and symmetrically distributed.

[0011] The heat insulation ring forms an air gap with heat insulation effect between the inner flexible pipe and the outer flexible pipe.

[0012] Further, the outer surface of the extension pipe is fixedly provided with a retreat stop ring in the circumferential direction, which abuts on the outer side end face of the heat insulation ring to form auxiliary limiting of the heat insulation ring.

[0013] Further, the outer surface of the extension pipe is fixedly provided with a retreat stop ring in the circumferential direction, which abuts on the outer side end face of the heat insulation ring to form auxiliary limiting of the heat insulation ring.

[0014] Further, the outer flexible pipe comprises:

[0015] An outer pipe body coaxially sleeved outside the inner flexible pipe;

[0016] A buckle fixed on the inner wall of the outer pipe body and clamped on the heat insulation ring and the connecting piece.

[0017] Further, the buckle is provided as a plurality of buckles uniformly distributed along the circumferential direction of the inner wall of the outer pipe body.

[0018] Compared with the prior art, the multi-layer metal exhaust hose for controlling surface temperature has the following advantages:

[0019] (1) The inner flexible pipe and the outer flexible pipe are coaxially arranged in the present application, and the air gap is formed between the two by means of the heat insulation ring. The low thermal conductivity of air and the heat insulation effect of the heat insulation ring are combined to effectively block the transfer of exhaust heat in the inner flexible pipe to the outside, achieving more efficient heat insulation effect and surface temperature control effect from the structure. At the same time, the heat insulation ring is symmetrically arranged about the geometric center of the inner pipe body, ensuring uniform distribution of the air gap and avoiding local heat concentration. The heat insulation ring maintains stable position through clamping and subsequent auxiliary limiting structure, and will not damage the heat insulation space due to vibration or displacement in use, so that the heat insulation performance remains reliable for a long time.

[0020] (2) The inner flexible pipe and the outer flexible pipe of the present application both have the ability to stretch and bend. The outer flexible pipe is stably connected with the heat insulation ring and the connecting piece through the buckle, and can adapt to the installation displacement and working vibration of the exhaust pipeline synchronously with the inner flexible pipe, avoiding the relative wear between components. The use of appropriate metal materials and reasonable connection methods for each core component ensures the structural integrity, and the problem of easy breakage and short service life of the heat preservation sleeve is avoided, significantly prolonging the overall service life of the hose.

[0021] (3) The present application forms auxiliary limiting of the heat insulation ring by the retreat stop ring, and cooperates with the position limiting effect of the limiting protrusion to make the connection of each component more compact and the overall structure balanced in stress, effectively avoiding the displacement and falling off of the components during use. In addition, the extension pipe and the connecting piece are symmetrically connected, which not only facilitates the connection with other components of the exhaust pipeline, but also adapts to the size requirements of different installation environments, making the installation operation simple and more adaptable, and ensuring the use stability without additional complex fixing structure. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments of the application illustrated in the drawings are intended to explain the aspects of the present application and are not limiting of the present application. In the drawings:

[0023] Figure 1 Structure diagram of the multi-layer metal exhaust hose for controlling surface temperature according to the embodiment of the present application;

[0024] Figure 2 Structure diagram of the inner flexible tube according to the embodiment of the present application;

[0025] Figure 3 Structure diagram of the outer flexible tube according to the embodiment of the present application;

[0026] Figure 4 Structure diagram of the extension tube according to the embodiment of the present application.

[0027] Explanation of reference signs:

[0028] 1, inner flexible tube; 101, inner tube body; 102, connecting piece; 2, heat insulation ring; 3, outer flexible tube; 301, outer tube body; 302, buckle; 4, extension tube; 401, retreat stop ring. DETAILED DESCRIPTION

[0029] In order to make the technical solutions of the present application and their advantages clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0030] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0031] In addition, in the description of the present application, it should be noted that if the terms indicating the orientation or position relationship such as "upper", "lower", "inner", "outer" and the like appear, they are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, if the terms "first", "second" and the like appear, they are also only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0032] In addition, in the description of the present application, unless specifically defined otherwise, the terms "mount", "connected", "connection", "connecting member" should be interpreted broadly. For example, it can be fixed connection, or detachable connection, or integrally connected; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood in conjunction with the specific circumstances.

[0033] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0034] In the following, the present application will be specifically described by exemplary embodiments. However, it should be understood that the elements, structures and features in one embodiment can also be beneficially combined into other embodiments without further description.

[0035] The embodiment of the present application provides a multi-layer metal exhaust hose for controlling surface temperature, which is applied to the technical field of exhaust pipe. In the prior art, the hose is wrapped by a heat insulation sleeve to reduce heat dissipation and lower the surface temperature. In actual use, the wrapping structure cannot move synchronously with the metal exhaust hose, and is prone to wear and tear during long-term use. In addition, the service life of the heat insulation sleeve is short, and it will be damaged after a period of use, which makes it difficult to ensure the heat insulation effect for a long time, and further cannot stably avoid the safety hazards caused by the high surface temperature of the hose.

[0036] In view of this, in order to solve the problems in the prior art, the present application provides a multi-layer metal exhaust hose for controlling surface temperature, with reference to Figure 1 which comprises an inner flexible pipe 1, a heat insulation ring 2, an outer flexible pipe 3 and an extension pipe 4, and each component cooperates to realize the dual effects of temperature control and structural flexibility.

[0037] With reference to Figure 1 and Figure 2, the inner flexible pipe 1 as the core channel of waste gas conveying includes an inner pipe body 101 and a connecting piece 102. The inner pipe body 101 can adopt a stainless steel corrugated structure, which can not only ensure smooth flow of waste gas, but also endow the inner flexible pipe 1 with certain stretching and bending capacity to adapt to the installation and working displacement requirements of the exhaust pipe.

[0038] With reference to Figure 1 , the heat insulation ring 2 is made of ceramic fiber material, which has good heat insulation performance and can effectively block heat transfer. The heat insulation ring 2 is clamped on the connecting piece 102 and symmetrically distributed about the geometric center of the inner pipe body 101. This symmetrical arrangement structure can make the subsequent formed air gap for heat insulation uniformly distributed, avoiding local heat concentration.

[0039] With reference to Figure 1 and Figure 3 , the outer flexible pipe 3 can also adopt a stainless steel corrugated structure, which is coaxially sleeved outside the inner flexible pipe 1 and clamped at both ends on the heat insulation ring 2. The outer flexible pipe 3 and the inner flexible pipe 1 form an air gap through the support of the heat insulation ring 2. The thermal conductivity of air is low, which can form a natural heat insulation barrier. When the waste gas flows in the inner flexible pipe 1, the heat absorbed by the inner flexible pipe 1 is difficult to quickly transfer to the outer flexible pipe 3 through the air gap, thereby effectively controlling the temperature of the surface of the outer flexible pipe 3 and avoiding safety hazards caused by excessive surface temperature. By adopting this structure, the outer flexible pipe 3 can stretch and contract synchronously with the inner flexible pipe 1, avoiding the friction and damage problems caused by the heat insulation sleeve that cannot move synchronously in the prior art.

[0040] With reference to Figure 1 and Figure 4 , the extension pipe 4 is connected with the connecting piece 102 and symmetrically distributed. The extension pipe 4 can be selected from a stainless steel pipe with the same material as the inner flexible pipe 1. Its function is to lengthen the connecting length of the inner flexible pipe 1, facilitate butt joint with other components of the exhaust pipe, and symmetrically arranged can ensure that the stress of the entire hose is balanced, avoiding structural deformation caused by uneven stress after installation, affecting the use effect.

[0041] With reference to Figure 1 and Figure 4 , in order to further ensure the installation stability of the heat insulation ring 2, a stop ring 401 is fixedly arranged on the outer surface of the extension pipe 4 in the circumferential direction. The stop ring 401 can be made of stainless steel and is fixed on the extension pipe 4 by multi-point welding, and its position corresponds to the outer side surface of the heat insulation ring 2.

[0042] When the heat insulation ring 2 is clamped on the connecting piece 102, the retreat stop ring 401 abuts on the outer side end face of the heat insulation ring 2, forming auxiliary limiting of the heat insulation ring 2. During the working process of the hose, there will be certain vibration and displacement. If there is no limiting of the retreat stop ring 401, the heat insulation ring 2 may be axially displaced along the connecting piece 102 under the action of vibration, resulting in that the air gap between the inner flexible pipe 1 and the outer flexible pipe 3 becomes small or uneven, affecting the heat insulation effect. The setting of the retreat stop ring 401 can effectively block the axial movement of the heat insulation ring 2, ensuring that the heat insulation ring 2 always remains at the preset position, maintaining the stability of the air gap, thereby ensuring the continuous and reliable heat insulation performance of the hose.

[0043] With reference to Figure 4 , the limiting protrusions are arranged on the outer surface of the extension pipe 4 in the circumferential direction, so as to further reinforce the relative positions of the inner flexible pipe 1 and the heat insulation ring 2. The limiting protrusions can be integrally formed with the extension pipe 4 and are made of the same stainless steel material as the extension pipe 4. The limiting protrusions are annular protrusions, and the left and right sides of the limiting protrusions abut against the inner flexible pipe 1 and the heat insulation ring 2, respectively.

[0044] After the left and right sides of the limiting protrusions abut against the inner flexible pipe 1 and the heat insulation ring 2, the limiting protrusions can form a block to limit the movement space of the inner flexible pipe 1 and the heat insulation ring 2 along the extension pipe 4 in the axial direction. Even if slight loosening occurs, the inner flexible pipe 1 and the heat insulation ring 2 will remain stable in position under the block of the limiting protrusions, thereby ensuring the installation reliability of the heat insulation ring 2 and ensuring that the air gap is not damaged, so as to maintain good heat insulation effect.

[0045] With reference to Figure 1 and Figure 3 , the outer flexible pipe 3 is composed of an outer pipe body 301 and a buckle 302, and the two cooperatively realize reliable connection of the outer flexible pipe 3 with the heat insulation ring 2 and the connecting piece 102. The outer pipe body 301 adopts a stainless steel corrugated structure, which is compatible with the structure of the inner flexible pipe 1. The outer pipe body 301 can not only ensure the stretching and bending ability of the outer flexible pipe 3 and adapt to the displacement of the pipeline synchronously with the inner flexible pipe 1, but also ensure the structural strength and high-temperature resistance through the stainless steel material, so as to adapt to the working environment of the exhaust system.

[0046] With reference to Figure 1 , the buckle 302 is fixed on the inner wall of the outer pipe body 301 and can be made of elastic stainless steel material. The structure design of the buckle 302 is compatible with the shapes of the heat insulation ring 2 and the connecting piece 102. During installation of the outer flexible pipe 3, the two ends of the outer flexible pipe 3 are fixed through the clamping cooperation of the buckle 302 with the heat insulation ring 2 and the connecting piece 102. This clamping mode is simple to operate and can ensure the tightness of the connection between the outer flexible pipe 3 and the heat insulation ring 2 and the connecting piece 102, avoiding the falling of the outer flexible pipe 3 during the working process. Meanwhile, the fixing action of the buckle 302 can ensure that the outer pipe body 301 and the inner pipe body 101 always remain in the coaxial state, so that the air gap between the two is uniformly distributed, avoiding that the local air gap becomes too small due to the coaxiality deviation, thereby affecting the overall heat insulation effect.

[0047] Referring to Figure 3 In order to make the fixing of the outer flexible pipe 3 more firm and the force more balanced, the buckles 302 are arranged to be multiple and uniformly distributed along the inner wall of the outer pipe body 301.

[0048] If only a single buckle is arranged, the connection points of the outer flexible pipe 3, the heat insulation ring 2 and the connecting piece 102 will be relatively concentrated in force, resulting in excessive local force. During the vibration or stretching of the hose, the concentrated force can cause the buckle 302 to deform or fall off, thereby affecting the fixing stability of the outer flexible pipe 3. After the multiple buckles 302 are uniformly distributed, the force borne by each buckle 302 will be dispersed, avoiding excessive local force. At the same time, the uniformly distributed buckles 302 can form clamping force on the heat insulation ring 2 and the connecting piece 102 from multiple positions in the circumference of the outer pipe body 301, so that the connection of the outer flexible pipe 3, the heat insulation ring 2 and the connecting piece 102 is more closely, ensuring that the coaxiality of the outer pipe body 301 and the inner pipe body 101 is always stable, the air gap is uniform and consistent, thereby ensuring that the heat insulation performance and structural stability of the hose can be effectively guaranteed during long-term use.

[0049] The heat insulation effect of the present application will be further described below in combination with test data.

[0050]

[0051] The surface temperature test data of the present application is in the fourth row WSS Solid in the above table.

[0052] Among them, the hot gas flow is 800 kg / hour at 550 degrees, the surface temperature of the inlet end TsurIn is 96 degrees, the middle section TsurMid is 76 degrees, and the outlet end TsurOut is 74 degrees.

[0053] The hot gas flow is 1800 kg / hour at 550 degrees, the surface temperature of the inlet end TsurIn is 99 degrees, the middle section TsurMid is 79 degrees, and the outlet end TsurOut is 79 degrees.

[0054] The hot gas flow is 800 kg / hour at 600 degrees, the surface temperature of the inlet end TsurIn is 106 degrees, the middle section TsurMid is 85 degrees, and the outlet end TsurOut is 83 degrees.

[0055] The hot gas flow is 1800 kg / hour at 600 degrees, the surface temperature of the inlet end TsurIn is 110 degrees, the middle section TsurMid is 88 degrees, and the outlet end TsurOut is 88 degrees.

[0056] As can be seen from the surface test temperature records of the exhaust pipes with other structures in the above table, the surface temperature of the multi-layer metal exhaust hose with the structure of the present application is effectively controlled.

[0057] The above merely provides some embodiments of the present application, but not for limiting the present application. The technical features or structures in the different embodiments above can be combined to form other specific technical solutions. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A multi-layer metal exhaust hose for controlling surface temperature, characterized by, The utility model relates to a flexible pipe, which comprises: an inner flexible pipe (1) composed of an inner pipe body (101) and connectors (102) symmetrically fixed at both ends of the inner pipe body (101); a heat insulation ring (2) clamped on the connectors (102) and symmetrically arranged about the geometric center of the inner pipe body (101); an outer flexible pipe (3) coaxially sleeved outside the inner flexible pipe (1) and clamped at both ends on the heat insulation ring (2); extension pipes (4) connected to the connectors (102) and symmetrically distributed. The heat insulation ring (2) forms an air gap with heat insulation effect between the inner flexible pipe (1) and the outer flexible pipe (3).

2. A multi-layer metal exhaust hose for controlling surface temperature according to claim 1, wherein The outer surface of the extension pipe (4) is fixedly provided with a retreat stop ring (401) along the circumference, which abuts against the outer side end face of the heat insulation ring (2) to form auxiliary limiting of the heat insulation ring (2).

3. A multi-layer metal exhaust hose for controlling surface temperature according to claim 2, wherein The outer surface of the extension pipe (4) is provided with a limiting protrusion along the circumference, and the limiting protrusion is respectively abutted against the inner flexible pipe (1) and the heat insulation ring (2) on both sides.

4. The multi-layer metal exhaust hose for controlling surface temperature according to claim 1, wherein The outer flexible pipe (3) comprises: an outer pipe body (301) coaxially sleeved outside the inner flexible pipe (1); a buckle (302) fixed on the inner wall of the outer pipe body (301) and clamped on the heat insulation ring (2) and the connectors (102).

5. A multi-layer metal exhaust hose for controlling surface temperature according to claim 4, wherein The buckle (302) is arranged as a plurality of uniform distribution along the circumference of the inner wall of the outer pipe body (301).

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