Silicon nitride ceramic heating plug

Abstract

A silicon nitride ceramic heating plug belongs to the technical field of heating plugs. Comprising a binding post, a nut, a shell, a sheath, a first electric heating wire, a second electric heating wire and a third electric heating wire, the binding post is arranged at the upper end of the shell, and a nut is fixed at the upper end of the binding post; a heating rod is arranged in the shell, and a sealing ring is arranged between the outer ring of the heating rod and the upper end of the shell; the sheath is inserted from the lower end of the shell; and the first electric heating wire, the second electric heating wire and the third electric heating wire are arranged in the sheath. According to the utility model, the binding post, the sheath, the first electric heating wire, the second electric heating wire and the third electric heating wire are arranged; the second electric heating wire serves as a current limiter or a current adjusting element, the first electric heating wire and the third electric heating wire serve as heating elements, and the heating effect of the heating plug can be guaranteed through the arrangement of the multiple combinations of electric heating wires; the arrangement of sealing skirts, grooves and limiting blocks on the sealing sleeve and the limiting ring enables the binding post, the shell and the sealing sleeve to be fixed more tightly.

Description

Technical Field

[0001] The utility model belongs to the technical field of heating plugs, in particular to a silicon nitride ceramic heating plug. Background Art

[0002] In winter, it is difficult to start the engine at low temperature, especially carburetor engines and diesel engines. In order to ensure that the engine can start quickly and reliably under low temperature conditions, most diesel engines and gasoline engines are equipped with heating plugs to preheat the air entering the cylinder. The existing heating plugs have a single heating wire, poor heating effect, and insufficient connection.

[0003] Therefore, a silicon nitride ceramic heating plug is urgently needed to solve the above technical problems. Utility Model Content

[0004] The utility model aims to provide a silicon nitride ceramic heating plug to solve the above technical problems.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a silicon nitride ceramic heating plug, comprising a terminal, a nut, a shell, a sheath, a first heating wire, a second heating wire and a third heating wire; the terminal is arranged at the upper end of the shell, and a nut is fixed to the upper end of the terminal; a heating rod is arranged in the shell, and a sealing ring is arranged between the outer ring of the heating rod and the upper end of the shell; the sheath is inserted from the lower end of the shell; the first heating wire, the second heating wire and the third heating wire are arranged in the sheath.

[0006] The first heating wire is installed at the upper end of the sheath and fixed at the lower end of the heating rod; the upper end of the second heating wire is welded to the lower end of the first heating wire, and the lower end of the second heating wire is welded with a third heating wire.

[0007] A filling material is installed in the sheath, the upper end of the sheath is arranged in the shell and a ceramic tube is arranged outside the upper end of the sheath; an electrode sleeve is arranged outside the ceramic tube, an opening is opened on the electrode sleeve, and the inner diameter of the electrode sleeve is smaller than the outer diameter of the ceramic tube; the upper end of the sheath, the ceramic tube and the electrode sleeve are all located in the shell.

[0008] The upper end of the shell is provided with a sealing sleeve, the upper end of the sealing sleeve is provided with a limiting ring, and the terminal is arranged on the shell through the sealing sleeve.

[0009] The lower end of the sealing sleeve is provided with a sealing skirt, and the upper end of the sealing sleeve is provided with an annular edge; the upper end of the shell is provided with a groove matched with the sealing skirt, and the sealing skirt is fixed in the groove.

[0010] The outer ring of the limiting ring is provided with a downward limiting block, and the limiting block is fixed on the annular edge.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The utility model arranges a terminal, a sheath, a first heating wire, a second heating wire and a third heating wire; the second heating wire acts as a current limiter or a current regulating element, the first heating wire and the third heating wire act as heating elements, and the arrangement of multiple combinations of heating wires can ensure the heating effect of the heating plug; the arrangement of the sealing skirt, the groove and the limit block on the sealing sleeve and the limit ring makes the fixation between the terminal, the shell and the sealing sleeve tighter. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of a silicon nitride ceramic heating plug;

[0014] Figure 2 is a top view cross-sectional schematic diagram of a silicon nitride ceramic heating plug;

[0015] Figure 3 is a schematic diagram of a sealing sleeve;

[0016] In the figure: 1. terminal; 2. nut; 3. housing; 4. sheath; 5. sealing ring; 6. first heating wire; 7. second heating wire; 8. third heating wire; 9. heating rod; 10. ceramic tube; 11. electrode sleeve; 12. opening; 13. sealing sleeve; 14. limiting ring; 15. sealing skirt; 16. annular edge; 17. groove. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-3 The utility model provides a technical solution: a silicon nitride ceramic heating plug, comprising a terminal 1, a nut 2, a shell 3, a sheath 4, a first heating wire 6, a second heating wire 7 and a third heating wire 8; the terminal 1 is arranged at the upper end of the shell 3, and the nut 2 is fixed to the upper end of the terminal 1; a heating rod 9 is arranged in the shell 3, and a sealing ring 5 is arranged between the outer ring of the heating rod 9 and the upper end of the shell 3; the sheath 4 is inserted from the lower end of the shell 3; the first heating wire 6, the second heating wire 7 and the third heating wire 8 are arranged in the sheath 4.

[0019] The lower end of the terminal 1 is fixed to the upper end of the housing 3 , and the bottom end of the terminal 1 is fixed to the heating rod 9 .

[0020] The housing 3 is provided with a threaded sleeve. When in use, as the threaded sleeve is continuously tightened, the threaded sleeve rotates into the connection.

[0021] The first heating wire 6 is installed at the upper end of the sheath 4 and fixed to the lower end of the heating rod 9; the upper end of the second heating wire 7 is welded to the lower end of the first heating wire 6, and the lower end of the second heating wire 7 is welded with the third heating wire 8.

[0022] The second heating wire 7 serves as a current limiter or current regulating element, while the first heating wire 6 and the third heating wire 8 serve as heating elements. The arrangement of multiple combinations of heating wires can ensure the heating effect of the heating plug.

[0023] Furthermore, a support ring is provided in the middle of the heating rod 9 to increase the stability of the heating rod 9 .

[0024] A filling material is installed in the sheath 4, the upper end of the sheath 4 is arranged in the outer shell 3 and a ceramic tube 10 is arranged outside the upper end of the sheath 4; an electrode sleeve 11 is arranged outside the ceramic tube 10, an opening 12 is opened on the electrode sleeve 11, and the inner diameter of the electrode sleeve 11 is smaller than the outer diameter of the ceramic tube 10; the upper end of the sheath 4, the ceramic tube 10 and the electrode sleeve 11 are all located in the outer shell 3.

[0025] The opening 12 passes through the electrode sleeve 11 . The inner diameter of the electrode sleeve 11 is smaller than the outer diameter of the ceramic tube 10 , so that the electrode sleeve 11 can be tightened and fixed on the outer wall of the ceramic tube 10 , and at the same time, the tightness between the sheath 4 and the ceramic tube 10 is increased.

[0026] A sealing sleeve 13 is disposed at the upper end of the housing 3 , a limiting ring 14 is disposed at the upper end of the sealing sleeve 13 , and the terminal 1 is disposed on the housing 3 via the sealing sleeve 13 .

[0027] The lower end of the sealing sleeve 13 is provided with a sealing skirt 15, and the upper end of the sealing sleeve 13 is provided with an annular edge 16; the upper end of the shell 3 is provided with a groove 17 adapted to the sealing skirt 15, and the sealing skirt 15 is fixed in the groove 17 to increase the fixation of the sealing sleeve 13 in the shell 3.

[0028] The outer ring of the limiting ring 14 is provided with a downward limiting block 18 , and the limiting block 18 is fixed on the annular edge 16 to increase the stability of the fixing of the terminal 1 .

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A silicon nitride ceramic heating plug, It is characterized in that The invention comprises a terminal (1), a nut (2), a shell (3), a sheath (4), a first heating wire (6), a second heating wire (7) and a third heating wire (8); the terminal (1) is arranged at the upper end of the shell (3), and a nut (2) is fixed to the upper end of the terminal (1); a heating rod (9) is arranged in the shell (3), and a sealing ring (5) is arranged between the outer ring of the heating rod (9) and the upper end of the shell (3); the sheath (4) is inserted from the lower end of the shell (3); and the first heating wire (6), the second heating wire (7) and the third heating wire (8) are arranged in the sheath (4).

2. A silicon nitride ceramic heating plug according to claim 1, Features: The first heating wire (6) is mounted on the upper end of the sheath (4) and fixed to the lower end of the heating rod (9); the upper end of the second heating wire (7) is welded to the lower end of the first heating wire (6), and the lower end of the second heating wire (7) is welded to the third heating wire (8).

3. The silicon nitride ceramic heating plug according to claim 1, Features: A filling material is installed in the sheath (4); the upper end of the sheath (4) is arranged in the outer shell (3) and a ceramic tube (10) is arranged outside the upper end of the sheath (4); an electrode sheath (11) is arranged outside the ceramic tube (10); an opening (12) is provided on the electrode sheath (11); the inner diameter of the electrode sheath (11) is smaller than the outer diameter of the ceramic tube (10); the upper end of the sheath (4), the ceramic tube (10) and the electrode sheath (11) are all located in the outer shell (3).

4. The silicon nitride ceramic heating plug according to claim 1, Features: A sealing sleeve (13) is provided at the upper end of the housing (3), a limiting ring (14) is provided at the upper end of the sealing sleeve (13), and the terminal (1) is arranged on the housing (3) via the sealing sleeve (13).

5. A silicon nitride ceramic heating plug according to claim 4, Features: The lower end of the sealing sleeve (13) is provided with a sealing skirt (15), and the upper end of the sealing sleeve (13) is provided with an annular edge (16); the upper end of the housing (3) is provided with a groove (17) matched with the sealing skirt (15), and the sealing skirt (15) is fixed in the groove (17).

6. A silicon nitride ceramic heating plug according to claim 5, Features: The outer ring of the limiting ring (14) is provided with a downward limiting block (18), and the limiting block (18) is fixed on the annular edge (16).

Images