JPH085328Y2 - Vaporizer heating device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a carburetor heating device for improving startability of an engine.

[Conventional technology]

In the case of a carburetor installed in an engine of an automobile, a motorcycle, an automobile, a three-wheeled vehicle, or the like, when the fuel vaporizes, latent heat of vaporization is taken from the surroundings, and the outside air temperature is low. (For example, 2 ° C. to 5 ° C. or less), the inside of the intake passage may be too cold, and it may take time to start the engine.

Therefore, in order to improve engine startability in cold weather,
A method of heating the entire carburetor by guiding the heated air flow to the carburetor surface when passing through the surface of the radiator or engine (JP-A-62-26354), water from the radiator (hot water)
There has been proposed a method of introducing the above into the vaporizer to heat it, or a method of mounting a heating wire heater in the vicinity of the float chamber of the vaporizer (JP-A-62-26352).

However, the method of introducing hot air or hot water from a radiator or the like is not very effective at the time of engine start when the radiator itself is cooling to near the outside temperature, and moreover, it takes a considerable time to effectively heat the carburetor after the engine starts. I need it.

Also, in the method of directly heating with a heating wire heater, etc.,
・ Temperature sensor is required for OFF control, which makes control structure complicated and costly.

By the way, in a cooling system of a water-cooled engine, an in-line type thermostat valve is provided on the outlet side of a water jacket formed in a cylinder or a cylinder head, and when the temperature of the cooling water exceeds a certain value, the thermostat valve is opened to cool the cooling water. Is used to circulate the heat to the radiator.

Therefore, as a measure to improve the conventional heating device for the carburetor, a bypass water passage for returning the carburetor from the upstream side of the thermostat valve (outlet side of the water jacket) is provided, and engine cooling water (hot water) flowing through the bypass water passage is provided. A method of loosening the vaporizer can be considered.

In this method, it is conceivable to adopt a structure in which hot water (engine cooling water) is circulated by providing a water passage having a diameter of, for example, about 2 mm through a desired portion of the carburetor main body (for example, a bypass port or the like where temperature tends to be low) .

[Technical issues to be solved by the invention]

By the way, fine particles of foundry sand or metal may exist in the cooling water circulation passage such as the water jacket formed in the cylinder or cylinder head of the engine.

However, in the heating device that bypasses the carburetor from the upstream side of the thermostat valve, foreign matter such as the molding sand and metal particles and dust flow into the small-diameter bypass water passage in the carburetor together with the cooling water. However, it is conceivable that the flow path will become clogged and the flow rate will decrease over a long period of time.

In addition, dust or foreign matter may flow into the small-diameter bypass water channel in the vaporizer to cause clogging. Furthermore, it is difficult to perceive that clogging has occurred. Further, in order to eliminate the clogging, it is necessary to once remove the water from the cooling water channel, and the work for eliminating the clogging is complicated.

[Means for solving problems]

The present invention has been made in view of the above technical problems, and an object of the present invention is to reduce or prevent clogging of a bypass water passage for heating a vaporizer,
When clogging occurs, it can be easily visually recognized, and the work for removing the clogging can be easily performed without removing water from the cooling water passage. It is to provide a device.

The carburetor heating device of the present invention is attached to the outlet part of the upper part of the water jacket of the engine, and moves when the temperature of the cooling water from the water jacket is above a set value to open the radiator side outlet, and a valve member. A thermostat valve having an auxiliary valve member that is provided on the upstream side of the valve member and that closes the carburetor-side outlet in conjunction with the movement of the valve member, and for circulating engine cooling water that heats the carburetor body. A carburetor for injecting a passage formed in the vicinity of the fuel supply port of the carburetor main body, a forward bypass water passage connecting between a carburetor side outlet of the thermostat valve and an inlet of the carburetor passage, and In the return bypass channel connecting the outlet of the carburetor passage and the middle of the cooling water channel from the thermostat valve to the radiator, and in the middle of the forward bypass channel. Comprising a filter having a substantially same outer diameter as detachably mounted 該往-out bypass passage, and when the temperature of the cooling water from the water jacket is less than a set value,
By opening the auxiliary valve member of the thermostat valve, the cooling water from the water jacket is circulated through the passage of the vaporizer to achieve the above object.

〔Example〕

 Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the overall construction of an embodiment of a vaporizer heating device to which the present invention is applied.

In FIG. 1, the water jacket 2 of the engine 1
The thermostat valve 3 is attached to the outlet side of the water jacket, and the temperature of the cooling water from the water jacket 2 is set to a set value (for example, 70
(° C) or higher, the thermostat valve 3 is opened in response to this, cooling water flows from the hose 10A to the radiator 4, and after cooling by the radiator 4 flows to the pump 5 via the hose 10B. The water pump 5 again feeds the water jacket 2 of the engine 1. The cooling water is cooled by heat exchange with the air flow while circulating through the radiator 4.

On the other hand, when the temperature of the cooling water from the engine 1 is below the set value (for example, 70 ° C.), the thermostat 3 responds to this and the valve is closed.

In this closed state, the cooling water from the engine 1 is shut off by the thermostat valve 3, does not flow to the radiator 4, and is returned directly to the water pump 5 through the bypass water passage, if any, and is again returned to the engine 1 by the water pump 5. Sent to.

The water jacket 2 is formed in a cylinder (not shown) and a cylinder head (not shown) of the engine 1 so as to surround a combustion chamber, and as shown in the figure, cooling water is introduced from the lower part and discharged from the upper part. Has been done.

A carburetor 7 is connected between the intake passages 6A and 6B of the engine 1, and atomizes and mixes the fuel with the air taken in from the air cleaner 8 by the intake negative pressure due to the stroke motion of the engine 1,
It is configured to supply the prepared air-fuel mixture to the engine 1.

However, as a warming device for the carburetor 7, a bypass water passage 9 for returning to the carburetor 7 from the upstream side of the thermostat valve 3 (between the water jacket 2 and the thermostat valve 3) is provided, and the bypass water passage 9 is provided. A structure is provided in which the carburetor 7 is warmed by flowing engine cooling water (hot water coming out of the water jacket 2).

The illustrated bypass channel 9 is a channel (outgoing bypass channel) 9A from the upstream side of the thermostat valve 3 to the carburetor 7,
It is composed of a water passage (passage) 9B formed inside the vaporizer 7 and a water passage (return bypass water passage) 9C extending from the vaporizer 7 to the downstream side of the thermostat valve 3.

A position of the bypass channel 9 on the upstream side of the carburetor 7,
That is, in the illustrated example, the thermostat valve 3 to the vaporizer 7
A detachable filter 20 is installed in the middle of the bypass waterway 9A going to.

It should be noted that the bypass water passage 9 has a structure in which it is automatically closed when the cooling water temperature exceeds a set value (for example, 70 ° C.). In the illustrated example, a thermostat valve 3 of a bottom bypass type is used. The opening operation of the thermostat valve 3 closes the inlet of the outward bypass channel 9A.

FIG. 2 is a sectional view showing the structure of the main part of the vaporizer 7.

In FIG. 2, a vacuum piston 12 is provided slidably across an intake passage 11 for supplying air from an air cleaner 8 (FIG. 1) to the engine 1 (FIG. 1), and is attached to the vacuum piston 12. Main nozzle that communicates with the float chamber (combustion reservoir) 14 by the jet needle 13
It is configured to adjust the opening of 15.

That is, when the engine speed is high and the intake negative pressure is strong, the vacuum piston 12 is pulled upward in FIG. 2, the opening of the main nozzle 15 is increased, and the fuel supply amount is increased.

A butterfly valve type throttle valve 16 is provided on the downstream side (engine side) of the vacuum piston 12 in the intake passage 11. The throttle valve 16 is normally opened and closed by a driver's throttle (accelerator) operation via a wire (not shown).

A bypass port 17 for supplying fuel during idling and low speed operation is formed slightly downstream of the closed position of the throttle valve 16, and the bypass port 17 floats via a fuel passage 19 in which a bypass jet 18 is inserted. It leads to room 14.

However, near the bypass port 17 of the carburetor 7, there is provided a passage 9B which constitutes a part of the bypass water channel 9 (FIG. 1) (a through hole portion penetrating the carburetor 7). The passage 9B is formed with a diameter of about 2 mm, for example.

The water channel 9B is formed, for example, by penetrating a vaporizer body (aluminum die-casting) or the like near the portion where the temperature is likely to be lowered by depriving the latent heat of vaporization such as the bypass port 17 or the like, and an inlet end thereof. A bypass waterway 9A (Fig. 1) from the upstream side of the valve 3 is connected, and a bypass waterway 9C (Fig. 1) returning to the downstream side of the thermostat valve 3 or other suitable position is connected to the outlet end thereof. .

FIG. 3 is a vertical sectional view showing details of the thermostat valve 3 in FIG.

In FIG. 3, the thermostat valve 3 has a structure in which a valve mechanism 22 in a case 21 forming a water channel is housed and a lid 23 is attached to the outlet side of the case 21.

The illustrated example shows a case where the thermostat valve 3 is integrally assembled to the outlet portion of the water jacket 2 of the engine 1, that is, the cylinder head 24. Cooling water from the engine 1 is directed upward from the lower opening 25 of the case 21. be introduced.

On the other hand, the lid 23 has a radiator-side outlet 26 that leads to an inlet of the radiator 4 (FIG. 1) via a pipe 10A (FIG. 1).
Is provided.

Further, the carburetor 7 (Fig. 1) is connected to the case 21 side of the thermostat valve 3 via the bypass water channel 9A (Fig. 1).
A carburetor-side outlet 97 connected to an inner passage (water channel) 9B (Figs. 1 and 2) is formed.

The thermostat valve 3 shown in FIG. 3 is of a wax type, and a container 28 in which the wax is enclosed, a piston 29 whose protrusion length from the container 28 changes due to a change in the volume of the wax, and a valve fixed to the container 28. A movable part having a member 31 and an auxiliary valve member 33 attached to the container 28 by being urged downward by a spring 32, and the valve member 31.
Has a valve seat 34 with which it strikes and a return spring 35
It is composed of a frame portion that presses and holds the valve member 31 against the valve seat 34 by means of an elastic force.

That is, the thermostat valve 3 is one in which the valve mechanism 22 including the movable portion and the frame portion is fixed and assembled in the chamber (a part of the water channel) formed by the case 21 and the lid 23. Using the lower end (upstream end) of the movable member, the inlet of the outward bypass channel 9A (evaporator side outlet 27)
Is configured to open and close.

However, according to the present invention, the filter 20 (Fig. 1) is removably mounted at a position on the upstream side of the carburetor 7 of the bypass water channel 9, that is, at a position in the middle of the forward bypass water channel 9A. .

The filter 20 vaporizes foreign matter such as foundry sand or metal powder or dust that has fallen off the casting surface of the engine 1 from the vaporizer 7.
It is for preventing the invasion into the inner through hole (water channel) 9B.

FIG. 4 is a vertical sectional view showing a detailed structure of the filter 20.

In FIG. 4, the filter 20 has a structure in which the inside of the case 41 is partitioned by a mesh (filtering material) 42, and projecting portions 43 and 44 that form inlets and outlets are provided at both ends of the case 41. , 44 are fitted with rubber hoses constituting the bypass water channel 9A and tightened with bands 45, 46.

When the filter 20 is to be replaced due to clogging or the like, it can be easily replaced by loosening the handles 45 and 46.

According to the embodiment described with reference to FIGS. 1 to 4 above, when the cooling water temperature is lower than the set temperature (for example, 70 ° C.), the thermostat valve 3 is at the valve opening position shown by the solid line in FIG. Since the auxiliary valve member 33 is located at the position where the carburetor side outlet 27 is opened, the cooling water from the engine 1 is circulated to the carburetor 7 through the bypass water passages 9A, 9B and 9C.

In that case, the condition of the carburetor 7 immediately after starting at low temperature depends on the temperature of the bypass port 17 for supplying fuel during idling and constant speed operation.
Since the bypass water channel (passage) 9B consisting of a sufficiently thin through hole having a diameter of about 2 mm is formed at a position sufficiently close to the bypass port 17 which is the fuel supply port, the flow velocity in the bypass water channel 9B is increased and the bypass port is also formed. 17 can be directly heated, and the malfunction of the carburetor after start-up in cold weather can be reliably eliminated in a shorter time, and normalization can be achieved early.

When the temperature of the cooling water rises (for example, 70 ° C. or higher), the thermostat valve 3 moves to the valve opening position indicated by the chain double-dashed line in FIG. 3 in response to this, and the auxiliary valve member 33 causes the carburetor side outlet.
Since the position for closing 27 is reached, the reflux of high-temperature water to the vaporizer 7 is blocked.

At this time, the cooling water (hot water) from the engine 1 freely recirculates to the radiator 4, so that the engine 1
There is no problem in cooling.

A mesh 42 is provided upstream of the carburetor 7 (including the inlet portion) in the bypass water channels 9A, 9B, and 9C that return to the carburetor 7 from the upstream side of the thermostat valve 3 (position that comes out of the water jacket 2 of the engine 1). Since a filter 20 is attached to catch dust (foreign matter), the water jacket 2
Even if dust such as foundry sand, metal powder or other foreign matter is contained in the cooling water coming out of the device, it can be captured and the dust enters the water channel (through hole) 9B in the vaporizer 7. It is possible to prevent clogging.

Moreover, since the filter 20 is removably mounted at a position on the upstream side of the carburetor 7, when clogging due to dust or the like occurs, it is easy to visually recognize the clogging, and the filter 20 cannot be washed. The cooling water can be easily performed without removing the cooling water from the cooling water passage, and the maintenance and inspection of the clogging can be easily performed on a regular basis.

If dust or the like is clogged in the narrow passage 9B in the main body of the carburetor 7, it is difficult to clean and remove it. However, according to the above-described embodiment, such a problem can be solved.

Further, the fuel system pipes are arranged in a very complicated manner around the carburetor 7, and the filter is attached to the carburetor 7 and the cylinder head 24.
However, in the above-described embodiment, the filter 20 is detachably mounted in the middle of the bypass water passage 9A on the upstream side of the carburetor 7, and the outer diameter of the filter 20 is large. The bypass waterway 9A
Since it is approximately the same as the outer diameter of the filter 20, it becomes possible to arbitrarily select the mounting position of the filter 20 within the range of the bypass water channel 9A, and a layout that allows easy inspection and replacement of the filter 20 in a short time is provided. It will be possible.

Further, since the filter 20 itself or the mesh 42 is detachably attached, when the filter 20 is clogged, it is sufficient to replace only the filter 20 or the mesh 42, and the carburetor 7 continues to operate as it is. Can be used.

Therefore, it is possible to obtain a carburetor heating device that can easily and inexpensively perform repairs when dust is clogged in the bypass water passage 9.

[Effect of device]

As is apparent from the above description, according to the carburetor heating device of the present invention, the carburetor heating device is mounted at the outlet of the upper portion of the water jacket of the engine and moves when the temperature of the cooling water from the water jacket is equal to or higher than the set value. A thermostat valve having a valve member for opening the radiator side outlet and an auxiliary bubble member for closing the carburetor side outlet provided on the upstream side of the valve member in association with the movement of the valve member; A carburetor having a passage formed in the vicinity of the fuel supply port of the carburetor body for circulating the engine cooling water to be heated, and a carburetor side outlet of the thermostat valve and an inlet of the carburetor passage A return bypass connecting the forward bypass water passage connecting between the above and the outlet of the passage of the carburetor and the middle of the cooling water flow passage from the thermostat valve to the radiator. The thermostat valve is provided with a water channel and a filter that is detachably mounted in the middle of the forward bypass channel and has an outer diameter substantially the same as that of the forward bypass channel when the temperature of the cooling water from the water jacket is below a set value. The auxiliary valve member is opened to allow the cooling water from the water jacket to flow through the passage of the vaporizer.

Therefore, it is possible to reduce or prevent the occurrence of clogging of the bypass water passage for heating the vaporizer, and when clogging occurs, it can be easily visually recognized, and moreover, the water from the cooling water passage can be easily detected. Provided is a carburetor heating device capable of easily performing a work for eliminating clogging without removing the above.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an overall configuration of an embodiment of a vaporizer heating device to which the present invention is applied, FIG. 2 is a longitudinal sectional view of the vaporizer in FIG. 1, and FIG. 3 is FIG. FIG. 4 is a vertical sectional view of the thermostat valve therein, and FIG. 4 is a vertical sectional view of the filter in FIG. 1 ... Engine, 2 ... Water jacket, 3 ... Thermostat valve, 4 ... Radiator, 5 ... Water pump,
7 ... Vaporizer, 9 (9A, 9B, 9C) ... Bypass channel, 10
A, 10B …… Cooling water piping (hose), 11 …… Intake passage, 12
…… Vacuum piston, 16 …… Throttle valve, 17 ……
Bypass port, 20 ...... filter, 22 ... valve mechanism, 24 ...
… Cylinder head, 26 …… Radiator side outlet, 27 …… Vaporizer side outlet, 31 …… Valve member, 33 …… Auxiliary valve member, 34 …… Valve seat, 35 …… Return spring, 41…
… Case, 42 …… Mesh, 43,44 …… Projection, 45,46
……band.

Claims (1)

[Scope of utility model registration request] 1. An engine (1) is attached to an upper outlet portion of a water jacket (2), and moves when the temperature of cooling water from the water jacket (2) is a set value or more to open the radiator side outlet. The valve member (31) and the valve member (3) interlocked with the movement of the valve member (31).
A thermostat valve (3) having an auxiliary valve member (33) for closing the carburetor side outlet (27) provided on the upstream side of 1), and a thermostat valve (3) for circulating engine cooling water for heating the carburetor body. A carburetor (7) having a passage (9B) formed in the vicinity of the fuel supply port of the carburetor body, a carburetor side outlet (27) of the thermostat valve (3) and a passage of the carburetor (7) ( 9B) an outflow bypass channel (9A) connecting to the inlet, a carburetor channel (9B) outlet and a cooling water channel (10A) from the thermostat valve (3) to the radiator (4).
A return bypass channel (9C) connecting between the middle of the forward bypass channel (9C) and a filter (20) detachably attached in the middle of the forward bypass channel (9A) and having an outer diameter substantially the same as that of the forward bypass channel (9A). When the temperature of the cooling water from the water jacket (2) is below the set value, the auxiliary valve member (33) of the thermostat valve (3) is opened to allow the cooling water from the water jacket (2) to flow. The passage (9) of the vaporizer (7)
A warming device for a vaporizer characterized by being passed through B).