JPH0736121Y2 - Icing prevention device for multiple vaporizers - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a vaporizer for adjusting and controlling the amount and concentration of an air-fuel mixture supplied to an engine, and particularly to preventing icing that occurs during operation of a multiple vaporizer. Regarding the device.

[Conventional technology]

The throttle valve is kept at a low opening during idling or off-idling of the engine, and during such operation, mixing is performed from so-called low-speed mixture passages such as pilot outlet holes and bypass holes that open corresponding to the throttle valve. The air is sucked into the intake passage of the carburetor body.

At this time, gasoline as a fuel forming the air-fuel mixture has less latent heat of vaporization than the periphery of the low-speed air-fuel mixture passage of the carburetor body, and the intake passage around the low-speed air-fuel mixture passage is cooled.

In particular, the inner wall of the intake passage around the low-speed mixture passage may be cooled to 0 ° C. or less.

In such a state, when a large amount of water is contained in the air and high-humidity air is sucked into the intake passage of the carburetor, the humid air becomes supersaturated at the temperature of the inner wall of the cooled intake passage. In some cases, the water content inside of the intake passage may cause ice formation on the inner wall of the intake passage to block the opening of the low-speed air-fuel mixture passage to the intake passage, resulting in a malfunction of the engine.

As a means for solving such a problem, there is JP-B-36-5205. That is, the cooling water in the radiator is circulated with a passage around the orifice.

[Problems to be solved by the invention]

According to such a conventional device, the circumference of the orifice is heated by the cooling water, and the temperature around the orifice can be raised. However, the carburetor main body in the vicinity of the orifice is particularly provided by the passage formed in the carburetor main body. It is difficult to heat efficiently.

That is, since the cooling water flows out through the mere linear passage from the upper position to the lower position, it is difficult to secure a large heat radiation area for the cooling water to apply heat to the carburetor body.

In order to obtain a sufficient heat radiation area with such a linear cooling passage, it is necessary to make the linear distance of the passage sufficiently long, which leads to an increase in the size of the entire carburetor and a degree of freedom in design of the entire engine. Limited and not preferred.

Further, it is extremely difficult to keep it within a limited range particularly when it is adopted in a multiple vaporizer.

Further, when the icing prevention device is optionally used in the conventional vaporizer, for example, as a specification for Europe where much fog is generated, it is not preferable to enlarge the vaporizer as described above.

[Means for solving problems]

The icing prevention device for a multiple vaporizer according to the present invention has been made in view of the above problems, and provides a compact device having excellent heating characteristics for a vaporizer body of cooling water flowing through a cooling water passage. In order to achieve the above object, a throttle valve is arranged in the intake passage that penetrates the carburetor body,
In a multiple vaporizer in which a plurality of carburetor main bodies provided with a low speed mixture passage corresponding to the throttle valve are arranged on the side of the carburetor main body, a cooling water reservoir having one end opened corresponding to the low speed mixture passage is provided. A cooling storage chamber is formed by closing the opening end of the cooling water storage recess with a closing member, and the closing member is located below the opening end A where the closing member opens in the cooling water storage chamber. A bottomed recess is formed, and a pipe is projected from the bottom surface D of the recess above the opening end A of the closing member to form a flow chamber, and the recess and the outer periphery of the pipe form a flow chamber. Either one of the cooling water inlet passage or the cooling water outlet passage is opened in the flow chamber, and either one of the cooling water outlet passage or the cooling water inlet passage is connected to the lower end of the pipe, and further the cooling of each vaporizer body facing each other. The water outflow passage and the cooling water introduction passage are connected by a connecting pipe and blocked. The wood is obtained by pressing and holding at mounting stay for fixing the carburetor body.

[Action]

The cooling water supplied into the cooling water storage chamber from the cooling water introduction passage opening at the lower part of the cooling water storage chamber of the carburetor at one end fills the cooling water storage chamber with the cooling water while rising in the flow chamber, and thereafter, It flows down from the tip opening of the pipe into the pipe and flows out from the cooling water outflow passage.

Then, the cooling water from the cooling water outflow passage fills the cooling water storage chamber with the cooling water while rising in the flow chamber from the cooling water introduction passage of the second vaporizer, and again flows down in the pipe from the tip opening portion of the pipe. Flow out from the cooling water outflow passage.

After that, it successively passes through the multiple vaporizers and flows out from the cooling water outflow passage at the other end.

〔Example〕

An embodiment of an icing prevention device for a multiple vaporizer according to the present invention will be described below with reference to the drawings.

First, the single vaporizer H which comprises a multiple vaporizer is demonstrated.

Reference numeral 1 denotes a carburetor main body having an intake passage 2 penetrating the inside thereof, and a float chamber main body 4 forming a float chamber 3 is arranged at a lower portion thereof. A throttle valve shaft 5 that is rotatably supported by the carburetor main body 1 passes through the intake passage 2, and a throttle valve 6 that opens and closes the intake passage 2 is attached to the throttle valve shaft.

The intake passage 2 corresponding to the throttle valve 6 is provided with a low speed mixture passage 7 such as a pilot outlet hole and a bypass hole. In this example, a bypass hole as the low speed mixture passage 7 is shown.

The lower portion of the low-speed mixture passage 7 is closed by a plug 8, and a cooling water storage recess 9 having one end open below the plug 8 is continuously provided. Then, this cooling water storage recess 9
The cooling water storage chamber 11 is formed in the cooling water storage recess 9 by closing the opening of the above with the closing member 10.

Reference numeral 12 denotes a bottomed concave portion that is formed below the opening end A of the closing member 10 to the cooling water storage chamber 11, and the pipe 13 projects from the bottom surface D of the concave portion 12. The opening end E of the pipe 13 to the cooling water storage chamber 11 projects toward the cooling water storage chamber 11 side from the opening end A of the closing member 10 and opens at an upper position.

A flow chamber 14 is formed by the recess 12 and the outer circumference of the pipe 13, and a cooling water introduction passage 15 is opened in the flow chamber 14, while a cooling water outflow passage 16 is connected to the lower end of the pipe 13. To be done.

Then, the single vaporizer H having the above-mentioned configuration is provided to the side H ₁ , H
_A plurality of carburetors are arranged in ₂ , H ₃ , and H ₄ to form a multiple vaporizer, and the throttle valve shaft 5 of each carburetor is connected by a connecting member (not shown). Is integrally fixed to each carburetor body 1 by a mounting stay 20 screwed with a screw P.

Then, the closing member 10 is pressed and held by the carburetor main body 1 by the mounting stay 20.

That is, 10A is a mounting step provided on the closing member 10, and a pressing hole 20A is formed in the stay 20 on the mounting step 10A, and the mounting stay 20 is screwed to each carburetor main body 1. By attaching the mounting step portion 10A of the closing member 10 to the pressing hole 20A, the mounting step portion 10A is pressed and held.

And vaporizers facing each other, H ₁ and H ₂ , H ₂ and H ₃ , H ₃
The cooling water outflow passage 16 of H ₄ and the cooling water introduction passage 15 are connected by a connecting pipe 21 such as a rubber article, and the cooling water introduction passage 15 of the vaporizer H _{1 at} one end is connected from a radiator (not shown). The cooling water is supplied and the cooling water is discharged from the cooling water outflow passage 16 of the vaporizer H _{4 at} the other end.

Next, the operation will be described.

When the engine is operated, the warmed cooling water in the radiator is supplied from the cooling water introduction passage 15 into the cooling water storage chamber 11 of the carburetor H _{1 at} one end by a water pump (not shown). According to this, the cooling water from the cooling water introducing passage 15 is first supplied into the flow chamber 14, and after filling the inside of the flow chamber 14, the cooling water storage chamber 11
Be introduced inside. Then, the cooling water level in the cooling water storage chamber 11 is gradually raised, and finally the cooling water overflows from the opening end E at the tip of the pipe 13, and this overflowing cooling water passes through the inside of the pipe 13 and flows into the cooling water flow. It is discharged from the exit 16.

Then, the discharged cooling water is supplied to the second pipe through the connecting pipe 21.
The cooling water is supplied to the cooling water introducing passage 15 of the vaporizer H ₂ and is circulated in the second vaporizer in the same manner as described above, and is discharged from the cooling water outlet passage.

After that, the same operation is repeated and the water is discharged from the cooling water outflow passage 16 of the vaporizer H _{4 at} the other end.

In this embodiment, the cooling water introduction passage 15 is connected to the flow chamber 14, but the cooling water outflow passage 16 may be connected, and the pipe 13
Although the cooling water outflow path 16 is connected to the cooling water outflow path 16, it may be connected to the cooling water introduction path 15 and is determined from the layout of the entire engine.

[Effect of device]

As described above, the icing prevention device for the multiple vaporizer according to the present invention has the following effects.

The cooling water applied to the carburetor body is, for example, sequentially circulated in the cooling water introduction passage-flow chamber-cooling water storage chamber-pipe-cooling water outflow passage, and when the cooling water flows in the flow chamber, the closing member. The temperature of the cooling water can be applied to the carburetor body earlier, and the cooling water overflowing into the pipe can also warm the blocking member to warm the carburetor body.

That is, since the passage length (area) of the cooling water is in the closing member having a single length and the passage passage length can be doubled, the heating characteristic to the carburetor main body is particularly excellent. It is possible to provide an improved icing prevention device.

In particular, in the multiple vaporizer, the heating characteristics of the cooling water with respect to the vaporizer main body deteriorate as going from the vaporizer at one end to the vaporizer at the other end. It has become possible to heat efficiently.

Since the blocking member of each carburetor can be attached at the same time when the stay plate that connects the carburetors is attached, it is not necessary to prepare a special attachment member, for example, a mounting nut, etc. It is possible to provide an inexpensive icing prevention device.

According to such a closing member, the flow chamber and the pipe can be arranged substantially concentrically, so that the closing member can be made compact, and the conventional vaporizer can be easily adopted.

The flow of cooling water in the cooling water storage chamber is about 18
Since it is inverted by 0 degree, the air remaining in the upper part of the cooling water storage chamber is entrained and discharged at that time, so that the heat transfer property due to the residual air is deteriorated and the vapor lock between the passages due to the thermal expansion of air bubbles can be eliminated. .

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an icing prevention device of a multiple vaporizer according to the present invention. 1 ... Vaporizer main body, 7 ... Low-speed mixture passage 10 ... Blocking member, 11 ... Cooling water storage chamber 13 ... Pipe, 14 ... Flow chamber 15 ... Cooling water introduction passage, 16 ... Cooling water flow Departure 20 …… Installation stay

Claims (1)

[Scope of utility model registration request] 1. A multiple vaporizer in which a throttle valve is arranged in an intake passage penetrating the carburetor main body, and a plurality of carburetor main bodies having a low-speed mixture passage corresponding to the throttle valve are arranged laterally. In the above, a cooling water storage concave portion having one end opened is provided corresponding to the low speed mixture passage, and a cooling water storage chamber is formed by closing an opening end of the cooling water storage concave portion with a closing member. The closing member is provided with a bottomed recess below the opening end A where the closing member opens to the cooling water storage chamber.
A pipe projects from the bottom surface D of the recess to a position above the opening end A of the closing member to form a flow chamber by the recess and the outer circumference of the pipe, and a cooling water introduction passage or a cooling water outflow passage is formed in the flow chamber. One of the cooling water outflow passage and the cooling water introduction passage is connected to the lower end of the pipe, and the cooling water outflow passage and the cooling water introduction passage of each vaporizer body are connected to each other. And an icing prevention device for a multiple vaporizer, in which the blocking member is pressed and held by a mounting stay that fixes each vaporizer main body.