KR100811648B1 - Teflon washer for glow plug and glow flug with teflon washer - Google Patents

Abstract

A teflon insulating washer for a glow plug and a glow plug having the teflon insulating washer are provided to reduce manufacturing cost and to improve durability by sintering the insulating washer after molding process. A glow plug comprises a hollow housing, an axle, an insulating washer(30), a fixing nut, and a heating unit having a coil unit. The shaft is connected with one side of the housing, and receives power from external. The fixing nut fixes the shaft to the housing. One end of the heating unit is connected with the shaft and the other end of the heating unit is grounded to the housing and generates heat by using applied differences. The insulating washer has an insert unit(32), an expansion piece(34), and a through hole(31). The insert unit is inserted to the housing. The expansion piece has a larger external diameter than the insert unit. The expansion piece is integrally formed with the through hole where the shaft to be inserted.

Description

Teflon Washer for Glow plug and Glow Flug with Teflon Washer}

1 is a glow plug having a Teflon insulating washer according to an embodiment of the present invention,

2 is a teflon material washer for a glow plug according to an embodiment of the present invention,

3 is a flowchart illustrating a method of manufacturing a teflon insulating washer for a glow plug according to one embodiment of the present invention;

<Description of the symbols for the main parts of the drawings>

10: axis

12: fixing nut

20: housing

30: Insulation Washer

31: through hole

32: insertion unit

34 extension

40: heating unit

The present invention relates to a glow plug having a Teflon insulating washer and a Teflon insulating washer for a glow plug. More specifically, in a glow plug mounted on a diesel engine to preheat cold air, the glow plug's insulation washer is made of a material that does not cause thermal deformation even when the diesel engine is heated. The present invention relates to a glow plug having a teflon insulating washer and a teflon insulating washer for a glow plug capable of preventing an engine fire.

Internal combustion engines are generally divided into diesel engines and gasoline engines. Among these, the diesel engine has the advantage of better combustion efficiency than the gasoline engine, but typically has the disadvantage that the engine is more difficult to start than the gasoline engine. In more detail, the gasoline engine sparks using an ignition device in a mixer filled in a combustion chamber, thereby inducing an explosion in the engine. On the other hand, the diesel engine compresses the air in the engine cylinder until it reaches the ignition point of the fuel, and injects the fuel to ignite the fuel, thereby inducing an explosion in the engine.

Therefore, in the diesel engine, even if the air is compressed, if the external conditions (for example, the temperature) is not appropriate, the fuel is not ignited, which makes starting difficult. The difficulty in starting the diesel engine as described above is further exacerbated when the outside air temperature is low, such as in winter, because the fuel does not easily reach the ignition point under low outside temperature. That is, at low temperatures, the temperature of the compressed air does not easily rise, and even if fuel is injected, the fuel does not ignite.

In order to compensate for the difficulty of starting the diesel engine as described above, the development of a preheating device for a diesel engine has been actively carried out mainly in the automotive parts industry. The preheater is a device that preheats the air in the engine to help the ignition of fuel injected into the air, and is divided into a glow plug method and an intake heater method.

Hereinafter, the glow plug which is currently actively researched and developed among the said preheating apparatuses, and is used abundantly is demonstrated. The glow plug is a device that heats air from 800 ° C. to 900 ° C. in advance to help ignite the fuel, as described above. In this case, the glow plug uses a battery as a power source, and heats air by converting electrical energy of the battery into thermal energy.

The basic configuration of the glow plug may be summarized as a housing, a power supply unit (including a shaft), and a heating unit (including a heating coil). The power applying unit and the heating unit are structurally coupled to one side and the other side of the housing, respectively. The heat generating unit is coupled to the other side of the housing, and is formed by embedding a tungsten material heating wire or nichrome wire in a metal heating tube or ceramic sintered body.

The power supply unit includes a middle shaft, which functions to receive power from the outside and transmit the power to the heating coil.

The heating coil is generally connected to the power supply part (the other end of the middle shaft) and the other end of the heating coil is grounded on the inner surface of the housing so that a current flows in the heating coil due to the potential difference between the heating coils and Heat is generated by the resistance characteristic of the heating coil.

Therefore, the potential of the middle axis is equal to the potential of the power supply unit, and the potential of the housing must be maintained at the ground potential. This results in a potential difference between the high potential medium shaft and the low potential housing. In spite of this potential difference, the medium shaft must be fixed to the housing, so that an insulating washer is used to insulate the housing from the medium shaft while the medium shaft is fixed to the housing. do.

Since the insulating washer must maintain the potential difference between the middle shaft and the housing while supporting the middle shaft in the housing, when the insulation washer melts due to the high temperature of the engine room, the glow plug becomes inoperable and the middle shaft does not hold its position. The electrical contact causes electrical shorts and the risk of loss of life from vehicle fire.

Since the vibration level of the engine generated by the explosive force reaches a considerable level, and if the insulation washer is softened by the high temperature of the engine even before the insulation washer is melted, it is not long before the washer is caused by the strong vibration of the engine. It cannot support the inertia force of the generated axial axis and cannot maintain its shape. In this case, too, the glow plugs become inoperable as well as the central shaft does not stay in place and comes into contact with the housing, which causes electrical shorts and risks loss of life due to vehicle fire.

Recently, however, the engine cover of diesel engines has been tended to cover the upper and side parts of diesel engines for the purpose of protecting engines or aesthetics of engine rooms, or to reduce engine noise radiated directly into the air from the engines. Generalized.

This causes the temperature of the space between the engine surface and the engine cover to rise further as the heat of the engine cannot escape to the outside, and the end of the insulated washer of the glow plug is exposed to the space between the engine surface and the engine cover, making it more severe. It was put in the environment.

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을 이용하여 생성되는 폴리아마이드

인 PA66 재질의 절연 및 고정 수단을 사용하는 외국 타사(BOSCH 등)의 글로우 플러그 제품의 경우, 국내 디젤 엔진 차량에 장착하였을 때 전술한 이유로 전기적인 쇼트, 스파크 발생, 및 차량 화재를 일으켜 큰 품질 문제를 야기시키는 치명적인 문제점을 안고 있었다.By the harshness in terms of thermal aspects of the surrounding environment, hexamethylenediamine

Adipic acid

Polyamides Created Using

Glow plug products of foreign companies (BOSCH, etc.) that use insulation and fixing means made of PA66 material may cause electrical shorts, sparks, and vehicle fire for the above reasons when mounted on domestic diesel engine vehicles. Had a fatal problem causing.

In addition, although Teflon has been known to have excellent heat resistance, general extrusion and injection molding have a problem that is difficult, and the insulation plug for the glow plug has a problem in the manufacturing process so that Teflon has a glow plug insulation worldwide. There was no example of a washer.

In addition, although there is a method of turning to use the desired type of insulating washer, the manufacturing cost is soaring, there is a difficulty in applying.

The present invention solves the problems of the conventional competitors products, Teflon manufacturing process, and reveals that the invention was completed after several decades of development to provide an insulating washer for the glow plug that is feasible in terms of production cost.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art and to provide a glow plug and an insulating washer for a glow plug that is durable even in a high temperature environment.

Another object of the present invention is to provide a glow plug insulated washer that is feasible in terms of production cost by solving problems in the Teflon manufacturing process.

It is another object of the present invention to provide a mounting method and a mounting structure having excellent mounting property, durability, and rigidity between an insulating washer and a longitudinal axis, and a housing, thereby providing a glow plug having a Teflon material insulating washer and a Teflon insulating washer for a high quality glow plug. To do this.

The Teflon material insulating washer for a glow plug which concerns on this invention for achieving the objective of this invention relates to the insulation washer used for a glow plug. Here, the glow plug is coupled to the hollow housing 20, one side of the housing 20 and the main shaft 10 for receiving power from the outside, and the middle shaft 10 is insulated from the housing 20 Insulation washer 30 and fixing nut 12 for fixing in a state, and one end is connected to the middle shaft 10, the other end is grounded to the housing 20, the coil portion for generating heat by the applied potential difference It is comprised including the part 40.

The insulating washer 30 is a step of forming an insulating washer 110 by filling one teflon powder selected from PTFE, PFA, and FEP into a lower mold and then applying pressure from the top to the filled teflon powder using a pressing means. It is prepared through a manufacturing step including a step (120) of putting the molded insulating washer in a sintering furnace and heating and sintering, and a cooling step (130) of cooling the sintered insulating washer to room temperature.

The insulating washer 30 manufactured as described above is integrally formed with an insertion portion 32 inserted into the housing 20 and an extension piece 34 having a larger outer diameter than the insertion portion 32 and the middle shaft 10. The through hole 31 is provided so that it can be inserted.

Hereinafter, the configuration and operation of the Teflon material washer for the glow plug according to the present invention will be described in detail according to the embodiment shown in the accompanying drawings.

1 is a glow plug having a Teflon insulating washer according to an embodiment of the present invention, Figure 2 is a teflon insulating washer for a glow plug according to an embodiment of the present invention, Figure 3 is an embodiment of the present invention According to the manufacturing method of the Teflon insulating washer for the glow plug.

As shown, a glow plug has a hollow housing 20, a middle shaft 10 coupled to one side of the housing 20 and receiving power from the outside, and the middle shaft 10 having the housing 20. Insulation washer 30 and fixing nut 12 for fixing in an insulated state, and one end is connected to the middle shaft 10 and the other end is grounded to the housing 20 to the coil portion that generates heat by the applied potential difference It is configured to include a heating unit 40 provided.

The manufacturing method of the insulating washer 30 is demonstrated.

First, one teflon powder selected from PTFE, PFA, and FEP is filled into the lower mold. Preferably filled with PTFE.

Here, PTFE (polytetrafluoroethylene) is a crystalline resin, a material of heat resistance, chemical resistance, and electrical insulation.

At this time, it can be used by replacing with PFA or FEP instead of PTFE. The PFA is a polymer of polytetrafluoroethylene and fluoroalkyl vinyl ether, and has a melting point of 302 ° C to 301 ° C and a physical property similar to that of PTFE.

In addition, FEP is fluoroethylene propylene which is 250 degreeC-295 degreeC of melting | fusing point, and is excellent in light transmittance and weather resistance.

The next step is to apply pressure from the top to the filled Teflon powder using a pressing means to form an insulating washer. The pressing means may mean a plunger, an upper plate, an upper mold attached to a press for generating a reciprocating force, or alternatively, a concept including all of a press, a plunger, an upper plate, an upper mold. According to the shape of the insulating washer, the upper plate, the lower surface of the upper mold may be a simple plane.

The next step is to insert a molded insulating washer in the sintering furnace and to sinter by heating (120). The step 120 of inserting a molded insulating washer into a sintering furnace and heating the sintering step is characterized in that the molded insulating washer is heated and sintered so as to stay within a temperature range of 100 ° C. to 200 ° C. for 5 to 30 minutes. If the molded insulating washer stays within the temperature range of 100 ℃ to 200 ℃ within 5 minutes, the molded insulating washer may not be sintered enough to make the structure difficult and the hardness or strength may not reach the required level or be brittle. There is this big problem.

If the molded insulating washer stays in the temperature range of 100 ° C. to 200 ° C. for more than 30 minutes, more heating is required, which increases production cycle and wastes heat.

If the molded insulating washer is not heated above 100 ° C., the sintering action may not occur and the sintering may not be completed even after the heat treatment, and the insulating washer may be broken or broken. When the molded insulating washer is heated to 200 ° C. or more, the molded insulating washer is heated to a temperature higher than that required for sintering action, and thus the molded insulating washer is soft (large in ductility) and thus does not maintain its shape.

As a result of the experimental production, when the internal temperature of the sintering furnace was in the range of 380 ° C to 470 ° C, it was possible to keep the molded insulating washer within the temperature range of 100 ° C to 200 ° C for 5 to 30 minutes, and at this condition Because of this, the electrical, thermal and mechanical properties of the cooled washer after sintering were excellent. In this case, it also had an advantageous effect in terms of production cycle time.

When the internal temperature of the sintering furnace to 380 ℃ or less there is a problem that insufficient heat treatment does not occur or the production cycle time is long.

In the case of more than 470 ℃ range of the surface of the insulating washer molded article that the cross-sectional thickness is not more than 2mm has a problem of melting locally, and if heated for more than 30 minutes there is a problem that the production cycle is large, productivity is lowered and thermal efficiency is reduced .

The internal temperature of the most preferred sintering furnace was in the range of 400 ℃ to 450 ℃, which was excellent in sinterability, cycle time, electrical, mechanical and thermal characteristics of the insulation washer produced.

The next step is a cooling step 130 for cooling the sintered insulating washer to room temperature.

In the cooling step 130 of cooling the sintered insulation washer to room temperature, the insulation washer from the sintering furnace is gradually cooled for 5 to 30 minutes from high temperature to room temperature.

When the insulating washer from the sintering furnace is cooled to room temperature within 5 minutes, there is a problem that the molecular structure is broken by quenching, and when the cooling time is 30 minutes or more, there is a problem that the hardness strength drops.

As shown in FIG. 2, the insulation washer 30 manufactured as described above includes an insertion part 32 inserted into the housing 20 and an extension piece 34 having a larger outer diameter than the insertion part 32. It is characterized in that the through-hole 31 is formed so that the intermediate shaft 10 can be inserted.

In the insulating washer according to the embodiment of the present invention, the outer diameter of the extension piece 34 is 7 ~ 12mm, the thickness is 1 ~ 2.5mm, the depth of the insertion portion 32 is 1.5 ~ 3mm and 0.7 ~ 1.5 mm Is in range.

The insulating washer 30 has two insulation washer jaws formed so that the other surface 32a of the inserting portion 32 assembled toward the heat generating portion 40 is continuously formed on one inner surface of the hollow housing 20. The second surface 34a of the extension piece 34 facing the heat generating part 40 and smaller in the first catching jaw 21 having a smaller inner diameter among the 21 and 22, is directed to the two sides. It is configured to be caught by the second locking step 22, the inner diameter of the locking step (21, 22) for insulating washers.

Glow plug having a Teflon insulating washer according to an embodiment of the present invention is a hollow housing 20, a middle shaft 10 for coupling to one side of the housing 20 and receiving power from the outside, and the middle shaft Insulating washer 30 and fixing nut 12 for fixing 10 in an insulated state from the housing 20, one end of which is connected to the middle shaft 10, and the other end is grounded to the housing 20. And a heat generating section 40 provided with a coil section that generates heat by an applied potential difference.

The insulating washer 30 is a step of forming an insulating washer 110 by filling one teflon powder selected from PTFE, PFA, and FEP into a lower mold and then applying pressure from the top to the filled teflon powder using a pressing means. It is prepared through a manufacturing step including a step (120) of putting the molded insulating washer in a sintering furnace and heating and sintering, and a cooling step (130) of cooling the sintered insulating washer to room temperature.

The insulating washer 30 manufactured as described above is integrally formed with an insertion portion 32 inserted into the housing 20 and an extension piece 34 having a larger outer diameter than the insertion portion 32 and the middle shaft 10. ) Is provided with a through hole 31 to be inserted.

The insulating washer 30 has two insulation washer jaws formed so that the other surface 32a of the inserting portion 32 assembled toward the heat generating portion 40 is continuously formed on one inner surface of the hollow housing 20. The second surface 34a of the extension piece 34 facing the heat generating part 40 and smaller in the first catching jaw 21 having a smaller inner diameter among the 21 and 22, is directed to the two sides. It is configured to be caught by the second locking step 22, the inner diameter of the locking step (21, 22) for insulating washers.

The coil unit provided in the heat generating unit 40 of the glow plug may be a self-regulating glow plug including a heating coil and a control coil in which resistance increases rapidly due to an increase in temperature.

The heat resistance of the Teflon material washer of the present invention according to an embodiment of the present invention will be described through the following examples.

<First Embodiment>

Teflon insulating washer 30 and polyamide (PA66) and polyester insulating washers 310 and 320 of the present invention using the characteristics of Teflon were placed in a high temperature chamber at 150 ° C. and held for about 10 minutes.

As such, among the insulation washers exposed to the temperature of 150 ° C., the polyamide (PA66) and polyester insulation washers except for the Teflon insulation washers of the present invention lose their function due to thermal deformation as shown in FIG. 4. It was.

Second Embodiment

The Teflon insulating washer 30 and polyamide (PA66) and polyester insulating washers 310 and 320 of the present invention were placed in a high temperature chamber at 200 ° C. and held for approximately 10 minutes.

As described above, each of the insulation washers exposed to the temperature of 200 ° C., except that the polyamide (PA66) and polyester insulation washers 310 and 320 except for the Teflon insulation washer 30 of the present invention is 150 ° C. It caused thermal deformation and lost its function as shown in FIG.

Third Embodiment

The Teflon insulating washer 30, polyamide (PA66) and polyester insulating washer of the present invention were placed in a high-temperature chamber at 250 ° C and held for approximately 10 minutes.

As described above, each of the insulating washers exposed to the temperature of 250 ° C., the shape of the Teflon insulating washer 30 of the present invention was maintained, but deformation occurred when a pressure was applied. On the other hand, the polyamide (PA66) and the insulating washers (310, 320) made of polyester has a thermal deformation starting at 150 ℃ and lost its function as shown in FIG.

The above embodiment is summarized through a table as follows.

<Table 1>

   Apply to    Exposure time (minutes)  Temperature (℃)    result  150  200  250  Teflon Insulated Washers (3)  10  No heat deformation  No heat deformation  Heat Deformed by Pressure Heat deformation at temperatures above 250 ℃ Polyamide Insulated Washers (30)  10  Heat deformation  Heat deformation  Loss of Insulation Washer Shape Heat deformation at temperatures above 150 ℃ Polyester Insulated Washers (300)  10  Heat deformation Loss of Insulation Washer Shape  Loss of Insulation Washer Shape Heat deformation at temperatures above 150 ℃

As shown in Table 1, it can be seen that the Teflon insulating washer 30 of the present invention is more excellent in heat resistance than the insulating washer made of polyamide (PA66) and polyester.

Therefore, it can be seen that the glow plug formed by applying the Teflon insulating washer 30 maintains its function because heat deformation does not occur even if heat of the diesel engine is not smoothly discharged to the outside.

Although the present invention has been described in connection with the above-mentioned preferred embodiment, the scope of the present invention is not limited to the embodiment, various modifications and variations will be possible.

According to the present invention, the problems of the prior art are solved, and a glow plug and an insulating washer for a glow plug which are excellent in a high temperature environment are provided.

In addition, there is provided an insulating washer for a glow plug that is feasible in terms of production cost by solving problems in the Teflon manufacturing process.

In addition, by providing a mounting method and a mounting structure excellent in mounting, durability, and firmness between the insulating washer and longitudinal axis, the housing, a glow plug having a Teflon material insulating washer and a Teflon insulating washer for a high quality glow plug is provided.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, the scope of the present invention is not limited to these embodiments, and the scope of the present invention is defined by the following claims, and equivalent scope of the present invention. It will include various modifications and variations belonging to.

Claims (9)

Insulated washers used for glow plugs, The glow plug is coupled to the hollow housing 20, one side of the housing 20, and a central shaft 10 for receiving power from the outside, and the middle shaft 10 insulated from the housing 20. Insulating washer 30 and fixing nut 12 for fixing and one end is connected to the middle shaft 10, the other end is grounded to the housing 20 is provided with a coil unit for generating heat by the applied potential difference ( 40), including; The insulation washer 30, Filling one teflon powder selected from PTFE, PFA, and FEP into the lower mold and then applying pressure from the upper portion to the filled teflon powder using a pressing means, forming an insulating washer (110); Inserting the molded insulating washer into the sintering furnace and heating to sinter it (120); It is manufactured through a manufacturing step including a cooling step 130 for cooling the sintered insulating washer to room temperature; The insulating washer 30 manufactured as described above is integrally formed with an insertion portion 32 inserted into the housing 20 and an extension piece 34 having a larger outer diameter than the insertion portion 32 and the middle shaft 10. Teflon material washer for a glow plug, characterized in that the through-hole 31 is provided so that it can be inserted. The method of claim 1, The insulation washer 30, The other surface 32a of the insertion portion 32, which is assembled toward the heat generating portion 40, generates heat in two insulation washer jaws 21 and 22 formed on the inner surface of the hollow housing 20 continuously. The first locking jaw 21 close to the side 40 and having a smaller inner diameter is caught, and the other side 34a of the extension piece 34 facing the heat generating unit 40 is the two locking hooks 21 for insulating washers. , 22) Teflon material washer for the glow plug, characterized in that the inner diameter is configured to be caught on the larger second engaging jaw (22). The method according to claim 1 or 2, The step 120 of sintering the molded insulating washer in the sintering furnace is characterized in that the molded insulating washer is heated and sintered so as to stay within a temperature range of 100 ° C. to 200 ° C. for 5 to 30 minutes. Teflon insulated washers for glow plugs. The method according to claim 1 or 2, The internal temperature of the sintering furnace is a plug plug Teflon material washer characterized in that the range of 380 ℃ ~ 470 ℃. The method according to claim 1 or 2, In the cooling step 130 for cooling the sintered insulating washer to room temperature Teflon insulation washer for glow plugs, characterized in that the insulating washer from the sintering furnace is continuously cooled slowly from 5 to 30 minutes from high temperature to room temperature. A hollow housing 20, a middle shaft 10 for coupling to one side of the housing 20 and receiving power from the outside, and for fixing the middle shaft 10 in an insulated state from the housing 20 An insulating washer 30 and a fixing nut 12, one end of which is connected to the middle shaft 10, and the other end of the heating unit 40 is provided with a coil unit which is grounded to the housing 20 and generates heat by an applied potential difference. Configured to include; The insulation washer 30, Filling one teflon powder selected from PTFE, PFA, and FEP into the lower mold, and then applying pressure from the top to the filled teflon powder by using a pressurizing means (110) for forming an insulating washer and sintering the formed insulating washer. It is manufactured through a manufacturing step including a step (120) of putting in a furnace and heating and sintering, and a cooling step (130) for cooling the sintered insulating washer to room temperature; The insulation washer 30 manufactured in this way, An insertion part 32 inserted into the housing 20 and an extension piece 34 having an outer diameter larger than that of the insertion part 32 are integrally formed and the through hole 31 can be inserted into the middle shaft 10. ) Is provided; The insulation washer 30, The other surface 32a of the insertion portion 32, which is assembled toward the heat generating portion 40, generates heat in two insulation washer jaws 21 and 22 formed on the inner surface of the hollow housing 20 continuously. The first locking jaw 21 close to the side 40 and having a smaller inner diameter is caught, and the other side 34a of the extension piece 34 facing the heat generating unit 40 is the two locking hooks 21 for insulating washers. , Glow plug having a Teflon material washer characterized in that the inner diameter is configured to be caught in the second locking step (22). The method of claim 6, The step 120 of sintering the molded insulating washer in the sintering furnace is characterized in that the molded insulating washer is heated and sintered so as to stay within a temperature range of 100 ° C. to 200 ° C. for 5 to 30 minutes. Glow plugs with Teflon insulated washers. The method of claim 6, Glow plug having a Teflon insulation washer, characterized in that the internal temperature of the sintering furnace is in the range of 380 ℃ ~ 470 ℃. The method of claim 6, In the cooling step 130 for cooling the sintered insulating washer to room temperature The insulation washer from the sintering furnace is slowly cooled continuously for 5 to 30 minutes from high temperature to room temperature, Coil provided in the heat generating portion 40 of the glow plug Glow plug having a Teflon material washer, characterized in that the self-regulating glow plug is configured to include a heating coil and a control coil in which the resistance rises rapidly by increasing the temperature.

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