JPS6137807Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an electric heating autochoke-equipped vaporizer.

[Conventional technology]

As is well known, the electric heating type automatic yoke of a vaporizer is made of bimetal 1' as shown in Fig. 4.
is heated by the heater 2', the bimetal 1' is thermally deformed, and the valve 5' is opened via a link etc., and the heat transfer from the heater 2' to the bimetal 1' is This is accomplished by two methods: conductive heat transfer through the shaft 4' and heat transfer by radiation, in which heat radiated from the heating element 2' is transferred directly to the bimetal 1'.

[Problem that the invention attempts to solve]

In this case, regarding heat transfer by radiation, the distance between the side surface of the bimetal 1' and the surface of the heater 2' (indicated by l in FIG. 5) varies due to the dents and bulges on the side surface of the bimetal 1'. This causes variations in the amount of thermal radiation received by the bimetal 1', which causes asymmetry in the thermal deformation of the bimetal 1', which causes variations in the opening speed and opening angle of the autochoke valve 3'. .

The present invention was developed in view of the above-mentioned points, and its purpose is to create a structure that easily eliminates heat transfer due to radiation as much as possible. To provide a carburetor with a heat transfer type autochoke that can further prevent variations in valve opening speed and opening angle, and to provide a support structure for a bimetal shaft using a heat insulating plate itself to prevent radiant heat transfer. Accordingly, it is an object of the present invention to provide an electrothermal arch yoke mechanism having a heat insulating plate for radiant heat transfer that is easy to assemble.

[Means for solving problems]

In order to achieve the above object, the present invention has the following technical means.

That is, to explain this using the reference numerals in the attached drawings that correspond to the embodiments, the present invention has the following features in the carburetor main body 1:
A bimetal chamber 12 partitioned by a bimetal case 10 and a cover 11 is provided, one end 9 of the chiyoke valve shaft 5 disposed in the gas container main body 1 faces into the bimetal chamber 12, and the other bimetal chamber 1
A bimetal shaft 16 is placed inside the bimetal shaft 16, and a bimetal 18 is placed at one end 17 of the bimetal shaft 16.
In the electric heating type auto-choke carburetor, the base end of the bimetal shaft 16 is fixed, the free end 19 is connected to one end 9 of the chyo-yoke valve shaft 5, and a heater 22 is attached to the other end of the bimetal shaft 16; The bimetal shaft 16 is divided by a stepped portion 16a into a small diameter portion 16b at one end 17 to which the bimetal 18 is attached, and a large diameter portion 16c at the other end to which the heater 22 is attached, and the radiant heat of the other heater 22 is insulated. The through hole 14 for passing the small diameter portion 16b through the synthetic resin heat insulating plate 15 for
A step receiving surface 15a is formed in contact with the wall surface, the small diameter portion 16b is passed through the through hole 14, and the step 16a is brought into contact with the step receiving surface 15a, so that the heat insulating plate 15 is placed between the bimetal 18 and the heater 22. This is an electric heating type autochoke-equipped vaporizer characterized in that the heat insulating plate 15 is supported and fixed to the inner wall surface 13 of the cover 11.

[Effect]

With the above configuration, since the synthetic resin heat insulating plate 15 is interposed between the heater 22 and the bimetal 18, radiant heat from the heater 22 is not transmitted to the bimetal 18. In this case, the insulation board 15
passes the through hole 14 through the small diameter portion 16b of the bimetal shaft 16, and connects the receiving surface 15a to the stepped portion 16a.
Since it is disposed around the outside of the bimetal shaft 16 in opposition to the radiant heat, the radiant heat is more completely insulated. And the bimetal shaft 16 is
Supported by this heat insulating board 15, this insulating board 1
5 is supported and fixed to the cover 11, a separate support structure for the bimetal shaft 16 is not required, and these can be easily assembled.

〔Example〕

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings FIGS. 1 to 3.

Reference numeral 1 denotes a carburetor main body, and the carburetor main body 1 has a ventilate passage 2 formed therein, and a small ventilate 4 having a main nozzle 3 installed therein is provided approximately in the center thereof. A chiyoke valve 6 pivotally supported on a chiyoke valve shaft 5 is rotatably disposed in the ventilator passage 2 on the upstream side (upper side in the figure) of the small ventilee 4, and on the other hand on the downstream side (in the figure) A throttle valve 7 is rotatably supported on a throttle valve shaft 8 in the ventilate passage 2 (lower side).

One end 9 of the chiyoke valve shaft 5 extends into a bimetal chamber 12 that is defined by a bimetal case 10 that is integrally provided with the carburetor main body 1 and a cover 11 of the case 10. ing. Then, a heat insulating plate 15 made of synthetic resin and in which a through hole 14 for a bimetal shaft is formed is attached to the wall surface 13 of the cover 11 with screws, etc., and a bimetal shaft 16 is installed in the through hole 14.
Pass through.

This bimetal shaft 16 has a stepped portion 16a.
is formed, and a small diameter portion 16b having a diameter that can be passed through the through hole 14 with this stepped portion 16a as a boundary.
and a large diameter portion 16c on the opposite side. Then, the small diameter portion 16b is passed through the through hole 14, and the stepped portion 16a is inserted into the stepped portion receiving surface 15 of the heat insulating plate 15.
The bimetal shaft 16 is passed through the heat insulating plate 15 so as to be supported by the bimetal shaft 16 in opposition to the heat insulating plate 15.

Then, the base end of the bimetal 18 is fixed to one end 17 of the small diameter portion 16b of the bimetal shaft 16 that protrudes from the heat insulating plate 15 (located on the left side of the heat insulating plate 15 in the figure), and is connected to the above-mentioned chiyoke valve shaft 5, and is located behind the heat insulating plate 15 (in the figure, the insulating plate 1
A heater 22 is installed at the other end 21 of the large diameter portion 16c of the bimetal shaft 16 (located on the right side of 5). That is, a heat insulating plate 15 for insulating the radiant heat of the heater 22 is interposed in the space between the heat generating surface of the heater 22 and the side surface of the bimetal 18, and the heat of the heater 22 is transmitted to the bimetal 18 via the bimetal shaft 16. This means that only conductive heat is transferred. The heater 22 is embedded in a spiral shape in the surface of a ceramic plate member, for example, and is connected to a power source 24 via an ignition switch 29, and its heating surface is connected to the other end of the bimetal shaft 16. The bimetal shaft 16 is attached to the other end 21 of the bimetal shaft 16 so as to be in contact with the other end 21. However, it may be attached to the inner peripheral surface 26 of the other end 21 as shown in the second figure, or it may be attached to the outer peripheral surface 27 of the other end 21 as shown in the third figure. Furthermore, a cylindrical body 28 surrounding the large diameter portion 16c of the bimetal shaft 16 and the heater 22 is integrally formed on the back surface of the heat insulating plate 15.

The operation will be explained based on the above configuration.

When the engine is started, the heater 22 is energized,
The heater 22 generates heat. The heat from the heater 22 is then transmitted to the bimetal shaft 16 and then to the bimetal 18. That is, the heat of the heater 22 is conductively transferred to the bimetal 18. Then, the bimetal 18 is deformed, the spring force of the bimetal gradually weakens, and the valve 6 opens.

Now, in the heat transfer process above, the heater 2
Even if radiant heat is emitted from the heating surface of the heater 22 and the bimetal 18, the heat insulating plate 15 made of synthetic resin is interposed in the space between the heater 22 and the bimetal 18.
It doesn't get through to 8. Therefore, variations in thermal deformation of the bimetal 18 due to heat transfer of radiant heat are prevented, and variations in the opening speed and opening angle of the choke valve 6 are also prevented.

In particular, the bimetal shaft 16 is divided into a small diameter part 16b and a large diameter part 16c by the stepped part 16a, and the small diameter part 16b is passed through the through hole 14 of the heat insulating plate 15.
The stepped portion receiving surface 15a of the heat insulating plate 15 is brought into contact with the stepped portion 16a, and the insulating plate 15 is placed in contact with the inner wall surface 13 of the cover 11.
Since it is supported by the heater 22, the radiant heat from the heater 22 is less likely to be transmitted to the bimetal 18 side, and variations in the opening speed and opening angle of the chiyoke valve 6 caused by the transfer of radiant heat are further prevented.

Moreover, since the heat insulating plate 15 itself constitutes a support body for the bimetal shaft 16, there is no need to separately provide a support body for the bimetal shaft 16, making it easy to assemble these electrothermal automatic yoke mechanisms.

[Effect of idea]

As detailed above, according to the present invention, the electrothermal type has a structure that completely eliminates heat transfer due to radiation from the heater and deforms the bimetal using only conductive heat transferred to the bimetal via the bimetal shaft. It is possible to provide a carburetor with an auto-ch yoke, and therefore it is possible to provide an electrothermal auto-ch yoke-equipped carburetor that is free from variations in the opening speed of the chyo yoke caused by heat transfer by radiation and variations in the opening angle. Therefore, it is possible to provide an electric heating automatic yoke mechanism that is easy to assemble and has a heat insulating plate for insulating radiant heat transfer.

[Brief explanation of the drawing]

The attached drawings, FIGS. 1 to 3, show an embodiment of the present invention, with FIG. 1 being a longitudinal side view, FIG. 2 being a cross-sectional view of main parts showing another example, and FIG. 3 being another example. FIG. 4 is a longitudinal sectional side view showing a conventional example, and FIG. 5 is a diagram showing the relationship between the bimetal and the heater. 6...Chiyoke valve, 11...Cover, 13...
Inner wall, 14... Through hole, 15... Heat insulation plate, 15a
...Stepped bearing surface, 16...Bimetal shaft, 1
6a...Step part, 16b...Small diameter part, 16c...Large diameter part, 18...Bimetal, 22...Heater.

Claims (1)

[Claims for Utility Model Registration] A bimetal chamber 12 partitioned by a bimetal case 10 and a cover 11 in the gas container body 1.
, one end 9 of the chiyoke valve shaft 5 disposed in the gas container main body 1 faces the inside of the bimetal chamber 12, a bimetal shaft 16 is arranged inside the other bimetal chamber 12, and one end 17 of the bimetal shaft 16 is provided. The base end of bimetal 18 is fixed to
In a vaporizer with an electric heating type automatic yoke, in which the bimetal shaft 16 is connected to the other end of the bimetal shaft 16 and a heater 22 is attached to the other end; The heater 22 is divided into a small diameter part 16b and a large diameter part 16c at the other end where the heater 22 is attached.
Synthetic resin insulation board 15 for insulating the radiant heat of
A through hole 14 for passing the small diameter portion 16b and a step receiving surface 15a in contact with the wall surface of the step portion 16a are formed, and the small diameter portion 16b is passed through the through hole 14 and the step portion 16a is inserted into the step receiving surface 15a. A vaporizer with an electric heating type automatic yoke, characterized in that a heat insulating plate 15 is interposed between a bimetal 18 and a heater 22 so as to face each other, and this heat insulating plate 15 is supported and fixed to an inner wall surface 13 of a cover 11. Claim 1 of the utility model registration claim characterized in that a cylindrical body 28 surrounding the large diameter portion 16c of the bimetal shaft 16 and the heater 22 is integrally formed on the back surface of the heat insulating plate 15. Vaporizer with electric heating autochoke.