Air heater

Abstract

An air heater comprises an outer shell and a heating body, the heating body is installed in the outer shell, the outer shell is in an axial penetrating cylinder shape, a turning installation part is integrally formed at the lower end of the cylinder shape, and the inner wall of the outer shell is fixedly connected with a hollow cylinder sleeve used for insulation and heat insulation. The lower end of the hollow cylindrical sleeve is provided with a flange radially extending towards the circle center of the inner hole, a plurality of limiting columns are integrally formed at the upper end of the flange in the axial direction of the shell, the heating bodies are in a strip shape and are wound on the limiting columns in an S shape, and all layers of wound heating bodies are parallel; wiring terminals are arranged on the front portion and the rear portion of the circumferential face of the shell and the front portion and the rear portion of the circumferential face of the hollow cylindrical sleeve respectively, hollow cylindrical pipes used for insulation and heat insulation are arranged on the outer walls of the two wiring terminals, the head end and the tail end of the heating body are connected with the wiring terminals respectively, and the hollow cylindrical sleeve, the limiting column and the hollow cylindrical pipes are all made of corundum.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle engines, in particular to an air heater. Background Art

[0002] In low temperature environments, the starting and operation of the engine may be greatly affected due to reasons such as increased oil viscosity and decreased lubrication effect. The air heater can increase the engine's intake temperature by heating the intake air and generating heat, thereby reducing starting resistance and improving the engine's starting performance, thereby improving fuel combustion efficiency, ensuring that the engine can work normally in low temperature environments, and improving vehicle driving stability.

[0003] The Chinese utility model patent with the authorization announcement number CN 104131921 B discloses an engine preheater, which has a metal shell on the outside, an inner cavity of the shell as an air duct, and a heating plate arranged in the air duct. When current passes through, the heat generated by the heating plate can heat the air passing through the air duct. The structure of the heating plate is a continuous parallel folded wave structure. Since the heating plate is a heating material with high resistivity and high temperature, an insulator made of ceramic material is arranged between the two wave peaks of the heating plate and the metal shell at the upper and lower wave peaks of the heating plate. The function of the insulator is to insulate and prevent damage to the metal shell. However, in such an air heater, the insulator is only arranged at the two wave peaks of the heating plate, but due to the high temperature of the heating plate, the heating plate will also affect other positions of the metal shell, resulting in a reduction in the life and working stability of the metal shell. Therefore, how to solve the above problems has become a research focus. Summary of the invention

[0004] The purpose of the utility model is to solve the problems existing in the prior art and to propose an air heater, wherein the inner wall of the shell of the air heater is fixedly connected with a hollow cylindrical sleeve for insulation and heat insulation, the hollow cylindrical sleeve is made of corundum, which isolates the heating element from the shell and prolongs the service life of the shell.

[0005] The purpose of the utility model is achieved in this way.

[0006] An air heater comprises a shell and a heating element, wherein the heating element is installed in the shell, the shell is an axially penetrating cylindrical tube, the lower end of the cylindrical tube is integrally formed with a folding mounting portion, the inner wall of the shell is fixedly connected with a hollow cylindrical sleeve for insulation and heat insulation, the lower end of the hollow cylindrical sleeve is provided with a flange extending radially toward the center of the inner hole, the upper end of the flange is integrally formed with a plurality of limiting columns along the axial direction of the shell, the heating element is a strip, the heating element is wound on the limiting columns in an "S" shape, and the layers of the heating element after winding are parallel;

[0007] The front and rear parts of the circumferential surfaces of the outer shell and the hollow cylindrical sleeve are provided with connection terminals, and the outer walls of the two connection terminals are provided with hollow cylindrical tubes for insulation and heat insulation. The head and tail ends of the heating element are respectively connected to the connection terminals. The hollow cylindrical sleeve, the limit column and the hollow cylindrical tube are all made of corundum.

[0008] Furthermore, a through hole is provided on the folding mounting portion, and the through hole is used for fixed connection with the engine.

[0009] Furthermore, the hollow cylindrical sleeve is fixedly connected to the outer shell by bolts.

[0010] Furthermore, the inner diameter of the outer shell is the same as the outer diameter of the hollow cylindrical sleeve.

[0011] Furthermore, the wiring terminal includes a nut, two washers, and a bolt, wherein the bolt passes through the inner wall of the hollow cylindrical tube, and two washers are arranged between the nut and the hollow cylindrical tube to clamp the driving power line between the two washers.

[0012] Furthermore, the material of the shell and the bolts is 3J53.

[0013] The air heater of the utility model has the advantages of simple structure, high temperature resistance and long service life.

[0014] The present invention will be further described below based on the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 for Figure 1 AA section view.

[0017] Figure 3 This is a schematic diagram of the structure of the wiring terminal.

[0018] Explanation of the reference numerals: housing 1, heating element 2, folding mounting portion 3, hollow cylindrical sleeve 4, flange 5, limiting column 6, connecting terminal 7, hollow cylindrical tube 8, through hole 9, nut 10, gasket 11, bolt 12, driving power line 13. DETAILED DESCRIPTION

[0019] See also Figure 1-2 An air heater comprises a shell 1 and a heating element 2. The heating element 2 is installed in the shell 1. The shell 1 is an axially penetrating cylindrical tube. A folding mounting portion 3 is integrally formed at the lower end of the cylindrical tube. A through hole 9 is provided on the folding mounting portion 3. The through hole 9 is used for fixed connection with the engine.

[0020] The inner wall of the shell 1 is fixedly connected with a hollow cylindrical sleeve 4 for insulation and heat insulation. The inner circle of the shell 1 has the same diameter as the outer circle of the hollow cylindrical sleeve 4, and the two shapes match. The hollow cylindrical sleeve 4 is fixedly connected to the shell 1 by bolts. The lower end of the hollow cylindrical sleeve 4 is provided with a flange 5 extending radially toward the center of the inner hole. The upper end of the flange 5 is integrally formed with a plurality of limiting columns 6 along the axial direction of the shell 1. The heating element 2 is in the form of a strip. The heating element 2 is wound around the limiting columns 6 in an "S" shape. The layers of heating elements 2 after winding are parallel, and there are air ducts between the parallel layers of heating elements 2. The hollow cylindrical sleeve 4 is arranged between the shell 1 and the heating element 2 to completely isolate the shell 1, thereby extending the service life of the air heater.

[0021] See also Figure 3 , the front and rear parts of the circumferential surfaces of the shell 1 and the hollow cylindrical sleeve 4 are provided with wiring terminals 7, and the outer walls of the two wiring terminals 7 are provided with hollow cylindrical tubes 8 for insulation and heat insulation, and the head and tail ends of the heating element 2 are respectively connected to the wiring terminals 7, and the hollow cylindrical sleeve 4, the limit column 6, and the hollow cylindrical tube 8 are all made of corundum, which can withstand a high temperature of 1300°C and has high strength. In this embodiment, the wiring terminal 7 includes a nut 10, two gaskets 11, and a bolt 12. The bolt 12 passes through the inner wall of the hollow cylindrical tube 8. Two gaskets 11 are provided between the nut 10 and the hollow cylindrical tube 8, and the driving power line 13 is clamped between the two gaskets 11. The material of the shell 1 and the bolt 12 is 3J53, and the 3J53 material can withstand a high temperature of 1300°C, thereby increasing the service life of the air heater.

[0022] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. An air heater, comprising a housing (1) and a heating element (2), wherein the heating element (2) is installed in the housing (1), and characterized in that: The shell (1) is in the shape of an axially penetrating cylindrical tube, the lower end of which is integrally formed with a folding mounting portion (3), the inner wall of the shell (1) is fixedly connected with a hollow cylindrical sleeve (4) for insulation and heat insulation, the lower end of the hollow cylindrical sleeve (4) is provided with a flange (5) extending radially toward the center of the inner hole, the upper end of the flange (5) is integrally formed with a plurality of limiting columns (6) along the axial direction of the shell (1), the heating element (2) is in the shape of a strip, the heating element (2) is wound around the limiting columns (6) in an "S" shape, and the layers of the heating element (2) after winding are parallel; The front and rear parts of the circumferential surfaces of the housing (1) and the hollow cylindrical sleeve (4) are provided with connection terminals (7); the outer walls of the two connection terminals (7) are provided with hollow cylindrical tubes (8) for insulation and heat insulation; the head and tail ends of the heating element (2) are respectively connected to the connection terminals (7); and the hollow cylindrical sleeve (4), the limiting column (6), and the hollow cylindrical tube (8) are all made of corundum.

2. The air heater according to claim 1, characterized in that: The folding mounting portion (3) is provided with a through hole (9), and the through hole (9) is used for fixed connection with the engine.

3. The air heater according to claim 1, characterized in that: The hollow cylindrical sleeve (4) is fixedly connected to the outer shell (1) by means of bolts.

4. The air heater according to any one of claims 1 to 3, characterized in that: The inner diameter of the outer shell (1) is the same as the outer diameter of the hollow cylindrical sleeve (4).

5. The air heater according to claim 1, characterized in that: The wiring terminal (7) comprises a nut (10), two washers (11), and a bolt (12); the bolt (12) passes through the inner wall of the hollow cylindrical tube (8); two washers (11) are arranged between the nut (10) and the hollow cylindrical tube (8); and a driving power line (13) is clamped between the two washers (11).

6. The air heater according to claim 5, characterized in that: The material of the housing (1) and the bolt (12) is 3J53.

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