JP2515370Y2 - Icing prevention device for multiple vaporizers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a carburetor for adjusting and controlling the amount and concentration of an air-fuel mixture supplied to an engine, and particularly to Regarding prevention device.

[Prior Art] A throttle valve is maintained at a low opening during idling operation or off-idle operation of an engine. During such operation, a so-called low speed such as a pilot outlet hole or a bypass hole opened corresponding to the throttle valve. The air-fuel mixture is sucked into the intake passage of the carburetor body from the air-fuel mixture injection hole.

At this time, gasoline as a fuel forming the air-fuel mixture evacuates latent heat of vaporization from the periphery of the vaporizer main body, especially around the low-speed air-fuel mixture injection hole, and the intake passage around the low-speed air-fuel mixture injection hole is cooled.

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

In such a state, when high moist air containing a large amount of moisture in the 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 inside may freeze on the inner wall of the intake passage to block the opening of the low-velocity mixture injection hole to the intake passage, leading to a malfunction of the engine.

As a means for solving such a problem, there is Japanese Utility Model Publication No. 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 periphery of the orifice may be heated by the cooling water to raise the temperature around the orifice. It is difficult to efficiently heat the carburetor main body near the orifice with such a passage.

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 dissipation 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 limits the design freedom of the entire engine. Is 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-mentioned problems, and has a heating characteristic for each vaporizer main body of the cooling water flowing through the cooling water passage. In order to achieve the above object, in order to achieve the above object, a throttle valve is arranged in an intake passage that horizontally penetrates the carburetor main body, and a low speed is provided on the lower surface of the intake passage corresponding to the throttle valve. In a multiple carburetor in which a plurality of carburetors with open air-fuel mixture injection holes are arranged on the side of the carburetor, the bottom of the carburetor main body reaches the vicinity of the low-velocity air-fuel mixture injection hole and the lower end opens. A cooling water storage recess is provided, and the closing member has a bottomed tubular outer tubular portion having an open top end and a bottom portion below, and a bottom portion that projects further upward from the upper end of the outer tubular portion and opens. A ring formed by the outer circumference and the inner circumference of the outer cylinder Inner flow path that forms an inner flow path inside and a first flow path that opens toward the flow chamber, and a second flow path that opens toward the inner flow path of the inner flow path And the blocking member is fixedly placed in the cooling water storage recess by an attachment stay that inserts the blocking member into the cooling water storage recess of each vaporizer and fixes and connects each vaporizer laterally. The upper end of the inner pipe portion of the closing member is opened near the upper bottom portion of the cooling water storage recess, and a single cooling water introduction passage is provided in the first passage of each carburetor facing the middle portion. Are connected and arranged, and the second flow path and the first flow path of the vaporizers adjacent to each other are connected by a connection pipe.

[Operation] Among the vaporizers constituting the multiple vaporizer, the cooling water circulating through the engine has a single cooling water introduction passage in each of the first passages of the vaporizers facing the intermediate portion. Supplied through. In the carburetor in the middle part, the cooling water flows into the flow chamber from the first flow path, and when the flow chamber and the upper bottom of the cooling water storage recess are filled with the cooling water, the inside of the inner pipe portion is emptied from the upper end. Cooling water flows into the one flow passage, and this cooling water is discharged from the second flow passage.
The inside of the cooling water storage recess is warmed by the supply of cooling water,
In addition, since the upper bottom of the cooling water storage recess reaches the vicinity of the low speed mixture injection hole, the periphery of the low speed mixture injection hole is effectively warmed and icing is suppressed.

On the other hand, in the vaporizers adjacent to each other, the cooling water reaching the second flow passage of the vaporizer located in the middle portion is supplied to the first flow passage through the connecting pipe, and the cooling water is supplied to the flow chamber. , Through the inner bottom channel of the cooling water storage recess to the second channel,
Cooling water is discharged from the second flow path of the vaporizer located on the outermost side.

[Embodiment] An embodiment of the quadruple vaporizer of the icing prevention device of the multiple vaporizer according to the present invention will be described below with reference to the drawings.

The multiple vaporizers are the first vaporizer H ₁ and the second vaporizer from the left.
A single vaporizer, which is composed of H ₂ , a third vaporizer H ₃ , and a fourth vaporizer H _4, and constitutes a multiple vaporizer will be described first.

Reference numeral 1 denotes a carburetor main body having an intake passage 2 penetrating horizontally in the interior thereof, and a float chamber main body 4 forming a float chamber 3 is disposed below the carburetor main body 1. A throttle valve shaft 5 rotatably supported by the carburetor body 1 passes through the intake passage 2, and a throttle valve 6 for opening and closing the intake passage 2 is attached to the throttle valve shaft. The lower surface 2A of the intake passage 2 corresponding to the throttle valve 6 is provided with a low speed mixture injection hole 7 such as a pilot outlet hole and a bypass hole. In this example, a low speed mixture injection hole 7 is shown as a bypass hole. Be done.

The low speed air-fuel mixture injection hole 7 has its downward opening closed by a plug 8. Reference numeral 9 denotes a cylindrical cooling water reservoir recessed in the carburetor main body 1, an upper bottom portion 9A formed above reaches the vicinity of the low speed mixture injection hole 7, and a lower end surface of the carburetor main body 1 below. Open to 1A. Reference numeral 10 denotes a closing member arranged in the cooling water storage recess 9 and is composed of the following. 10A
Is an outer cylindrical portion having a cylindrical shape with an upper end 10B opened and a bottom portion 10C below, and a mounting step portion 10D is formed below the outer cylindrical portion 10A. Reference numeral 10E is an inner pipe portion whose upper end 10F projects further upward than the upper end 10B of the outer tubular portion 10A from the bottom portion 10C, and an inner flow passage 10G opens inside the inner pipe portion 10E. That is, the inner flow passage 10G opens to the upper end 10F of the inner pipe portion 10E.

A flow chamber 10K is formed by the inner peripheral portion 10H of the outer tubular portion 10A and the outer peripheral portion 10J of the inner tubular portion 10E. In addition, the first flow passage 10L opens in the flow chamber 10K, and the second flow passage 10N opens in the inner flow passage 10G.

And a single carburetor with the above configuration is placed to the side
A plurality of H ₁ , H ₂ , H ₃ , and H ₄ are arranged to form a multiple vaporizer, and the throttle valve shaft 5 of each vaporizer is connected by a connecting member (not shown). Each carburetor is integrally fixed to each carburetor main body 1 by a mounting stay 11 screwed with a screw P.

Then, the mounting stays 11 press and hold the respective closing members 10 in the cooling water storage recesses 9 of the respective carburetor main bodies 1. That is, the pressing hole 11A formed in the mounting stay 11
Is disposed on the mounting step portion 10D of the closing member 10, and the mounting stay 11 is attached to the carburetor main body 1, whereby the closing member 10 is fixedly held on the carburetor main body 1.

And, in the vaporizer constituting the multiple vaporizer, the vaporizer located opposite the intermediate portion thereof, specifically, the vaporizers of the second vaporizer H ₂ and the third vaporizer H ₃ A single cooling water introducing passage 12 is connected to the first passages 10L, 10L. Further, in the vaporizers H ₂ and H ₃ located in the middle part and the vaporizers H ₁ and H ₄ adjacent thereto, specifically, in the vaporizers H ₁ and H ₂ , the first vaporizer H ₁ The first flow path 10L and the second flow path 10N of the second vaporizer H ₂ are connected by a pipe line 13. In the vaporizers H ₃ and H ₄ , the second flow path of the third vaporizer H ₃ is connected. 10N and the first flow path 10L of the fourth vaporizer H ₄ are connected by a pipe line 13. A radiator (not shown) is provided in the cooling water introduction passage 12.
This is to introduce more cooling water.

 Next, the operation will be described.

When the engine is operated, the warmed cooling water in the radiator is supplied to the cooling water introduction passage 12 by a water pump (not shown).

The cooling water flowing into the cooling water introducing passage 12 is divided into right and left in the figure, one is supplied to the first flow passage 10L of the second vaporizer H ₂ , and the other is the first flow of the third vaporizer H ₃ . Supplied to road 10L. The cooling water supplied to the second vaporizer H ₂ will be described. The cooling water from the first flow path 10L is first supplied into the flow chamber 10K, and after filling the flow chamber 10K, the cooling water storage recess 9
Be introduced inside. Then, the cooling water surface in the cooling water reservoir recess 9 is gradually raised, and finally the cooling water overflows from the opening of the upper end 10F of the inner pipe portion 10E.
It is discharged from the second channel 10N through the inner channel 10G of E.

Then, the cooling water discharged from the second flow passage 10N of the second vaporizer H ₂ is introduced into the flow chamber 10K of the first vaporizer from the first flow passage 10L of the first vaporizer H ₁ through the pipe line 13. After being supplied and filling the inside of the flow chamber 10K, it is introduced into the cooling water storage recess 9.

Then, the cooling water surface in the cooling water storage recess 9 is gradually raised, and finally the cooling water overflows from the opening of the upper end 10F of the inner pipe portion 10E, and the overflowed cooling water flows inward of the inner pipe portion 10E. Road 1
It is discharged from the second flow path 10N through 0G. And the first
The cooling water discharged from the second flow path 10N of the vaporizer H ₁ is returned to the radiator again.

On the other hand, the cooling water supplied to the third vaporizer H ₃ will be described. The cooling water from the first flow path 10L is first supplied into the flow chamber 10K, and after filling the flow chamber 10K, the cooling water storage recess 9 Be introduced inside. Then, the cooling water surface in the cooling water storage recess 9 is gradually raised, and finally the cooling water overflows from the opening of the upper end 10F of the inner pipe portion 10E, and the overflowed cooling water is the inner pipe portion.
It is discharged from the second flow passage 10N through the inner flow passage 10G of 10E.

Then, the cooling water discharged from the second flow passage 10N of the third vaporizer H ₃ is introduced into the flow chamber 10K of the fourth vaporizer from the first flow passage 10L of the fourth vaporizer H ₄ through the pipe 13. After being supplied and filling the inside of the flow chamber 10K, it is introduced into the cooling water storage recess 9.

Then, the cooling water surface in the cooling water storage recess 9 is gradually raised, and finally the cooling water overflows from the opening of the upper end 10F of the inner pipe portion 10E, and the overflowed cooling water flows inward of the inner pipe portion 10E. Road 1
It is discharged from the second flow path 10N through 0G. And the fourth
The cooling water discharged from the second flow path 10N of the vaporizer H ₄ is returned to the radiator again.

Further, although the present embodiment has been described with respect to the quadruple vaporizer, the same can be applied to the double vaporizer and the hexagonal vaporizer.

[Effects of the Invention] As described above, the icing prevention device for a multiple vaporizer according to the present invention has the following effects.

Since the cooling water is supplied to the side vaporizers from the vaporizers in the middle part of the multiple vaporizers, it is sufficient to heat the vaporizers corresponding to half of the multiple vaporizers. The rate of temperature rise due to the cooling water of the vessel can be increased. Further, the temperature of each carburetor can be equalized to the same temperature, which is particularly useful for preventing icing immediately after the engine is started.

The cooling water applied to the vaporizer main body is, for example, sequentially circulated in the first flow path-flow chamber-cooling water storage recess-inward flow path-second flow path, and the cooling water flows in the flow chamber. Sometimes the temperature of the cooling water can be applied to the carburetor main body earlier than the closing member, and the cooling water overflowing into the inner flow path can also warm the closing member to warm the carburetor main body. Is.

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

Especially, in the multiple vaporizer, the heating characteristic of the cooling water to the vaporizer main body decreases as it goes from the vaporizer at one end to the vaporizer at the other end, but a sufficient heat dissipation passage can be secured, so each vaporizer main body can be secured. It is possible to efficiently heat the.

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.

In addition, the flow of cooling water in the cooling water storage recess is
At the upper end, it reverses approximately 180 degrees, so at that time the air remaining in the upper part of the cooling water storage recess is entrained and discharged, so the heat transfer due to the residual air deteriorates and the passage due to the thermal expansion of air bubbles. The vapor lock between can be eliminated.

BRIEF DESCRIPTION OF THE 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 2 ... Intake passage 7 ... Low-speed mixture injection hole 9 ... Cooling water reservoir recess 10 ... Closing member 10A ... Outer cylinder 10B ... Upper end 10C ... Bottom 10E ... Inner pipe 10G ...... Inward flow path 10K ...... Flow chamber 10L ...... First flow path 10N ...... Second flow path 11 ...... Installation stay 12 ...... Cooling water introduction path 13 ...... Connection pipe H ₁ ...... First vaporization Unit H ₂ …… Second carburetor H ₃ …… Third carburetor H ₄ …… Fourth carburetor

Continuation of the front page (56) References Japanese Patent Application Laid-Open No. 59-196961 (JP, A) Japanese Patent Application No. 57-93478 (Japanese Utility Model Application No. 58-195049) The specifications and drawings attached to the application were photographed. Microfilm (JP, U) Microfilm (JP, U) Photograph of the contents and drawings attached to the application of Japanese Patent Application No. 57-171029 (Japanese Utility Model Application No. 59-75548)

Claims (1)

(57) [Scope of utility model registration request] 1. A throttle valve 6 is arranged in an intake passage 2 penetrating the carburetor main body 1 in a horizontal direction, and the intake passage 2 corresponding to the throttle valve 6 is arranged.
In a multiple vaporizer in which a plurality of vaporizers having low-velocity mixture injection holes 7 opened on the lower surface 2A of the vaporizer main body 1 are provided, the upper bottom portion 9A of the vaporizer body 1 reaches near the low-velocity mixture injection holes 7, A bottomed tubular cooling water storage recess 9 having an open lower end is provided, and a closing member 10 has an open upper end 10B and a bottomed tubular outer cylinder 10A having a bottom 10C, and a cylinder outer than the bottom 10C. 10A top end 1
0B projecting further upward and opening, the outer peripheral portion
The annular flow chamber 1 is formed by 10J and the inner peripheral portion 10H of the outer cylindrical portion 10A.
An inner pipe portion 10E having an inner flow passage 10G and forming a 0K, a first flow passage 10L opening toward the flow chamber 10K, and a first flow passage opening 10G toward the inner flow passage 10G of the inner pipe portion 10E. 2 channels
10N, the blocking member is inserted into the cooling water storage recessed portion 9 of each vaporizer, and the blocking member 10 is attached to the cooling water storage recessed portion 9 by a mounting stay 11 that fixes and connects each vaporizer laterally. Fixedly placed on the closure member 10
The upper end 10F of the inner pipe portion 10E of the upper end 9A of the cooling water storage recess 9 is
The first cooling passages 12L and 10L of each carburetor located opposite to the middle part are connected to a single cooling water introduction passage 12, and the second carburetors adjacent to each other are connected to each other. An icing prevention device for a multiple vaporizer, characterized in that a flow passage 10N and a first flow passage 10L are connected by a connecting pipe 13.