A heating plug with an anti-twist-off mechanism

Abstract

The utility model provides a preheating plug with an anti-twist-off mechanism, which relates to the technical field of automobile preheating plug design, including a connecting pipe, a limiting block fixedly connected to the surface of the connecting pipe, a terminal post arranged inside the connecting pipe, a blocking rod fixedly connected to the surface of the fixed block, a rubber block fixedly connected to the inner side of the blocking rod, a connecting block arranged on the top of the fixed block, a protective shell fixedly connected to the top of the connecting block, and a heating unit arranged above the protective shell. The utility model, by designing structures such as rubber blocks and limiting blocks, when the threaded connection of the connecting pipe and the terminal post is completed, the rubber block and the limiting block are at the same horizontal position, and at the same time, one end of the rubber block is just stuck on one side of the limiting block, preventing the connecting pipe from continuing to rotate clockwise, reminding the operator that the threaded connection between the connecting pipe and the terminal post has reached the end, and at the same time avoiding excessive torque that causes damage to the threads on the surface of the connecting pipe and the terminal post or breakage of the preheating plug.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile preheating plug design, in particular to a preheating plug with an anti-twist-off mechanism. Background Art

[0002] A glow plug is a device used for ignition in a diesel engine, especially to help the engine quickly reach operating temperature during cold start. The glow plug is usually located in the combustion chamber of a diesel engine, and increases the temperature of the air in the combustion chamber by heating, thereby facilitating ignition and combustion. This helps solve the problem of diesel engines having difficulty starting in low temperature environments. However, in the prior art, when the existing common glow plugs are connected to other structures, it is often unclear whether the glow plugs are fully tightened and the torque is increased. However, excessive torque can easily damage the connecting threads or directly break the glow plugs. Utility Model Content

[0003] The utility model aims to solve the defect in the prior art that excessive torque during the connection of the glow plug easily leads to the breakage of the glow plug, and proposes a glow plug with an anti-twist-off mechanism.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a preheating plug with an anti-twisting-off mechanism, comprising a connecting tube, a limiting block is fixedly connected to the surface of the connecting tube, a terminal is arranged inside the connecting tube, a heating sleeve is fixedly connected to the inside of the terminal, a fixed block is fixedly connected to the top of the terminal, a blocking rod is fixedly connected to the surface of the fixed block, a rubber block is fixedly connected to the inner side of the blocking rod, a connecting block is arranged on the top of the fixed block, a protective shell is fixedly connected to the top of the connecting block, and a heating unit is arranged above the protective shell.

[0005] As a preferred embodiment, a thread groove is provided on the inner wall of the connecting tube, and a thread matching the thread groove on the inner wall of the connecting tube is provided on the surface of the terminal post.

[0006] The technical effect of adopting the above further solution is that the inner wall of the connecting tube is adapted to the surface thread of the terminal, so that the connecting tube and the terminal can be threadedly connected to connect one end of the preheat plug to the terminal.

[0007] As a preferred implementation, there are six resistance rods, which are evenly distributed and fixedly connected to the outer surface of the fixed block, and a rubber block is fixedly connected to the inner side of each resistance rod.

[0008] The technical effect of adopting the above further solution is to prevent excessive twisting between the connecting tube and the terminal, which may cause the preheating plug to break during the connection process.

[0009] As a preferred embodiment, there are six limiting blocks, and the spacing distance between the limiting blocks evenly distributed and fixedly connected on the outer surface of the connecting pipe is the same as the spacing distance between the blocking rods evenly distributed and fixedly connected on the outer surface of the fixing block.

[0010] The technical effect of adopting the above further solution is that the connecting pipe and the terminal are threadedly connected so that a limiting block is arranged on the left side of each rubber block.

[0011] As a preferred implementation, the distance between the limiting block and the top of the connecting pipe is the same as the distance between the rubber block and the bottom of the fixing block.

[0012] The technical effect of adopting the above further scheme is: when the connecting tube and the terminal are threadedly connected to the end, the rubber block and the limiting block are at the same height, so that one end of the rubber block is just stuck on one side of the limiting block, preventing the connecting tube and the terminal from excessive rotation and causing breakage.

[0013] As a preferred embodiment, the inner side of the bottom of the resistance rod is provided with a rounded corner.

[0014] The technical effect of adopting the above further solution is that a rounded corner is arranged on the inner side of the bottom of the blocking rod to prevent the bottom of the blocking rod from scratching the surface of the connecting pipe, thus providing a certain protective effect on the outer surface of the connecting pipe.

[0015] Compared with the prior art, the advantages and positive effects of the utility model are:

[0016] In the utility model, by designing structures such as rubber blocks and limiting blocks, when the threads of the connecting tube and the terminal are connected to the end, the rubber block and the limiting block are in the same horizontal position, and one end of the rubber block is just stuck on one side of the limiting block, preventing the connecting tube from continuing to rotate clockwise, reminding the operator that the threaded connection between the connecting tube and the terminal has reached the end, and avoiding excessive torque that may cause damage to the threads on the surface of the connecting tube and the terminal or breakage of the preheating plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A three-dimensional diagram of a glow plug with an anti-twist-off mechanism provided by the utility model;

[0018] Figure 2 A disassembled stereoscopic diagram of a glow plug with an anti-twist-off mechanism provided by the utility model;

[0019] Figure 3 A partial stereoscopic view of a glow plug with an anti-twist-off mechanism provided by the utility model.

[0020] Legend:

[0021] 1. Connecting pipe; 11. Limiting block; 2. Terminal; 3. Heating sleeve; 4. Fixing block; 5. Block rod; 51. Rubber block; 6. Connecting block; 7. Protective shell; 8. Heating unit. DETAILED DESCRIPTION

[0022] 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.

[0023] Example 1

[0024] like Figure 1-Figure 3 As shown, the utility model provides a technical solution: a preheating plug with an anti-twisting mechanism, comprising a connecting tube 1, the inner wall of the connecting tube 1 is provided with a threaded groove, a limiting block 11 is fixedly connected to the surface of the connecting tube 1, the distance between the limiting block 11 and the top of the connecting tube 1 is the same as the distance from the rubber block 51 to the bottom of the fixed block 4, there are six limiting blocks 11, and the spacing distance between the limiting blocks 11 evenly distributed and fixedly connected on the outer surface of the connecting tube 1 is the same as the distance between the resistance rod 5 evenly distributed and fixedly connected on the outer surface of the fixed block 4, a terminal 2 is arranged inside the connecting tube 1, and the surface of the terminal 2 is provided with a thread matched with the threaded groove on the inner wall of the connecting tube 1, so that the connecting tube 1 and the terminal 2 can be threadedly connected, a heating sleeve 3 is fixedly connected inside the terminal 2, and a fixed block 4 is fixedly connected to the top of the terminal 2.

[0025] In this embodiment, the length of the thread groove opened on the inner wall of the connecting tube 1 is the same as the length of the thread set on the surface of the terminal 2. When the top end of the connecting tube 1 is screwed to coincide with the top end of the terminal 2, the thread groove on the inner wall of the connecting tube 1 is fully engaged with the thread on the surface of the terminal 2.

[0026] Example 2

[0027] like Figure 1-Figure 3As shown, a blocking rod 5 is fixedly connected to the surface of the fixed block 4, and a rounded corner is provided on the inner side of the bottom of the blocking rod 5 to prevent the bottom of the blocking rod 5 from scratching the surface of the connecting pipe 1, which has a certain protective effect on the outer surface of the connecting pipe 1. There are six blocking rods 5, and the blocking rods 5 are evenly distributed and fixedly connected to the outer surface of the fixed block 4. A rubber block 51 is fixedly connected to the inner side of the blocking rod 5, and a rubber block 51 is fixedly connected to the inner side of each blocking rod 5. The rubber block 51 is made of rubber material, so that the rubber block 51 rubs on the surface of the connecting pipe 1 to avoid scratching and damaging the surface of the connecting pipe 1. A connecting block 6 is arranged on the top of the fixed block 4, and a protective shell 7 is fixedly connected to the top of the connecting block 6. A heating unit 8 is arranged above the protective shell 7, and resistance wires are arranged inside the protective shell 7 and the heating unit 8.

[0028] In this embodiment, the width of the rubber block 51 is smaller than the length of the limiting block 11, so that one end of the limiting block 11 contacts the surface of the blocking rod 5, thereby preventing the rubber block 51 from being brushed over the limiting block 11 due to the soft rubber material and causing the limiting block 11 to lose the effect of preventing the rubber block 51 from continuing to rotate and preventing it from twisting off.

[0029] Working principle:

[0030] like Figure 1-Figure 3 As shown, by designing the limiting block 11 and the rubber block 51, the connecting tube 1 is rotated clockwise so that the thread groove on the inner wall of the connecting tube 1 is engaged with the thread on the surface of the terminal 2 until the top of the connecting tube 1 contacts the top of the terminal 2, and the connecting tube 1 and the terminal 2 are completely connected. One end of the limiting block 11 is rotated to the left side of the rubber block 51, and the limiting block 11 is fitted with the left surface of the rubber block 51, and the rubber block 51 and the limiting block 11 are in the same horizontal position. When the connecting tube 1 continues to rotate clockwise, the rubber block 51 will prevent the limiting block 11 from moving to the right, thereby preventing the connecting tube 1 and the terminal 2 from being over-twisted.

[0031] The above description is only a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any technician familiar with the profession may use the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes and apply them to other fields. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A glow plug with an anti-twist-off mechanism, comprising a connecting pipe (1), characterized in that: A limiting block (11) is fixedly connected to the surface of the connecting tube (1), a terminal (2) is arranged inside the connecting tube (1), a heating sleeve (3) is fixedly connected inside the terminal (2), a fixing block (4) is fixedly connected to the top of the terminal (2), a blocking rod (5) is fixedly connected to the surface of the fixing block (4), a rubber block (51) is fixedly connected to the inner side of the blocking rod (5), a connecting block (6) is arranged on the top of the fixing block (4), a protective shell (7) is fixedly connected to the top of the connecting block (6), and a heating unit (8) is arranged above the protective shell (7).

2. A glow plug with an anti-twist-off mechanism according to claim 1, characterized in that: The inner wall of the connecting tube (1) is provided with a thread groove, and the surface of the terminal post (2) is provided with a thread matching the thread groove on the inner wall of the connecting tube (1).

3. A glow plug with an anti-twist-off mechanism according to claim 1, characterized in that: There are six blocking rods (5), which are evenly distributed and fixedly connected to the outer surface of the fixed block (4), and a rubber block (51) is fixedly connected to the inner side of each blocking rod (5).

4. A glow plug with an anti-twist-off mechanism according to claim 3, characterized in that: There are six limiting blocks (11), and the spacing distances at which the limiting blocks (11) are evenly distributed and fixedly connected to the outer surface of the connecting pipe (1) are the same as the spacing distances at which the blocking rods (5) are evenly distributed and fixedly connected to the outer surface of the fixing block (4).

5. A glow plug with an anti-twist-off mechanism according to claim 1, characterized in that: The distance between the limiting block (11) and the top of the connecting pipe (1) is the same as the distance between the rubber block (51) and the bottom of the fixing block (4).

6. A glow plug with an anti-twist-off mechanism according to claim 1, characterized in that: The inner side of the bottom of the blocking rod (5) is provided with a rounded corner.

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