JP3974981B2 - Vaporizer icing prevention device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an anti-icing device for a carburetor that prevents moisture in the intake air from icing on the intake passage inner wall, throttle valve, fuel nozzle, etc. of the carburetor when it is cold and humid. The present invention also relates to an improvement in the manner in which a heat conducting member having a hose joint connected to a hot water chamber is fixed to a vaporizer and hot water is circulated through the hose joint to the hot water chamber.
[0002]
[Prior art]
Conventionally, as a device for preventing icing of such a vaporizer, a heat conductive member having a hot water chamber is formed in a flat plate shape, and this heat conductive member is joined to a planar heat conductive surface formed on the vaporizer body. It is known (see Japanese Utility Model Publication No. 60-147748).
[0003]
[Problems to be solved by the invention]
The conventional structure described above can easily heat a desired portion of the vaporizer simply by attaching the heat conduction member to the vaporizer, and the seal between the vaporizer and the heat conduction member prevents leakage of hot water. On the other hand, there is an advantage that there is no need to apply means, but since the heat conduction surface between the heat conduction member and the vaporizer is a flat surface, it is difficult to ensure that both heat conduction surfaces are always in close contact with each other, There is a drawback that the heating performance for the vaporizer tends to vary.
[0004]
The present invention has been made in view of such circumstances, and it is possible to easily and surely adhere the heat conduction member and the heat conduction surface of the vaporizer, and exhibits stable heating performance for the vaporizer. An object of the present invention is to provide an icing prevention device for a vaporizer.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is configured so that a heat conduction member having a hot water chamber inside and a hose joint connected to the hot water chamber is fixed to the vaporizer, and the hot water is circulated to the hot water chamber through the hose joint. In the icing prevention device for the vaporizer, the heat conducting member is formed in a hollow shaft shape with the hollow portion as a hot water chamber, hose joints are formed at both ends thereof, and the intermediate portion of the heat conducting member is disposed in the vaporizer thermally conductive holes formed in the, a first feature in that fixed by screwing over more than half the length of the heat conduction hole.
[0006]
According to the first feature, by connecting the hot water introduction hose and the hot water lead-out hose connected to the cooling water passage of the engine to the hose joints at both ends of the heat conducting member, one of the cooling water (hot water) flowing through the cooling water passage of the engine. The part circulates through the hot water chamber of the heat conducting member. Then, effective heat conduction is performed from the heat conduction member to the vaporizer body via a screwed portion having an extremely wide contact surface between the heat conduction member and the vaporizer, and the heat conduction of the vaporizer, in particular, even in cold weather. It is possible to quickly raise the temperature of the part close to the member and prevent icing. Moreover, since it is extremely easy to thread the heat conduction member and the heat conduction hole that are screwed together and to control the machining accuracy, it is necessary to ensure a wide heat conduction surface between the heat conduction member and the vaporizer with high accuracy during mass production. Can contribute to stabilization of the heating performance of the vaporizer. Further, since the hot water chamber is formed in the heat conducting member, no sealing member is required between the heat conducting member and the vaporizer to prevent water leakage, and the heat conducting member is screwed on itself. Therefore, a special fixing member is not necessary.
[0007]
In addition to the above feature, the present invention has a second feature that an orifice is provided in a flow path from one hose joint to the other hose joint.
[0008]
According to the second feature, it is possible to adjust the flow rate of the hot water in the heat conducting member by selecting the orifice, and thus obtain various heating performances for the vaporizer without changing the flow path diameter of the heat conducting member. be able to.
[0009]
Furthermore, in addition to the first or second feature, the present invention has a bolt head portion having a huge head for engaging a wrench at one end, screwed into the heat conduction hole, and tightened at both ends of the bolt portion. A third feature is that a heat conducting member is constituted by a pair of hose joints provided continuously, and at least a hose joint on the opposite side to the enormous head is formed so as to be able to be inserted into the heat conducting hole.
[0010]
According to this third feature, after inserting the hose joint on the opposite side of the huge head of the bolt part into the heat conduction hole of the vaporizer, the heat conduction is performed by operating the wrench engaged with the huge head. The member can be easily attached to the vaporizer.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.
[0012]
First, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a longitudinal sectional side view of a main part of a carburetor for a motorcycle equipped with an icing prevention device of the present invention, and FIG.
[0013]
In FIG. 1, a carburetor C for a motorcycle has a carburetor body 1 having a horizontal intake passage 2, and intake air of the engine flows in the direction of an arrow through the intake passage 2. A cylinder-shaped valve cylinder 3 formed integrally with the upper portion of the carburetor main body 1 slidably accommodates a piston-type throttle valve 4 that moves up and down to open and close the venturi 2a at the center in the axial direction of the intake passage 2. The A float chamber body 6 that defines a float chamber 5 is attached to the lower surface of the vaporizer body 1.
[0014]
The upper ends of the main nozzle 7 and the slow nozzle 8 are opened on the lower inner surface of the venturi 2a, and the lower ends thereof communicate with the fuel oil level in the float chamber 5 via the main jet 9 and the slow jet 10, respectively. The main nozzle 7 is inserted with a needle valve 11 attached to the center of the throttle valve 4, and the slow nozzle 8 is close to the downstream lower edge when the throttle valve 4 is lowered to the idle position. Are arranged respectively.
[0015]
Thus, when the intake air of the engine flows through the intake passage 2 as shown by the arrow, the flow rate can be controlled by adjusting the opening of the throttle valve 4. At that time, if the throttle valve 4 is in the idle position or the low opening position, the fuel stored in the float chamber 5 is ejected from the slow nozzle 8, and if the throttle valve 4 reaches the high opening position, it is ejected from the main nozzle 7. The ejected fuel is supplied to the engine together with the intake air flowing through the intake passage 2.
[0016]
As shown in FIGS. 1 and 2, the carburetor body 1 has a heat conduction hole 20 extending in the vertical direction as close as possible to the intake passage 2, the slow nozzle 8, and the throttle valve 4 when lowered, as a screw hole. A material having high heat conductivity, for example, a heat conducting member 21 made of brass, is screwed to this.
[0017]
The heat conducting member 21 has a hollow shaft shape, and is composed of a hollow bolt portion 22 having a hexagonal enormous head portion 22a at one end and a pair of hose joints 23 and 24 respectively connected to both ends of the bolt portion 22. The hollow portion of the bolt portion 22 is a hot water chamber 25, and the hollow portions of the hot water chamber 25 and both hose joints 23 and 24 are a series of flow paths. The hose joints 23 and 24 have a smaller diameter than the bolt part 22. The heat conducting member 21 configured in this manner is inserted into the heat conducting hole 20 through the hose joint 24 on the opposite side to the enormous head portion 22a, and then operated with a wrench engaged with the hexagonal head portion 22a. The heat conduction hole 20 is detachably fixed to the vaporizer body 1 by being screwed and tightened over a length of more than half of the heat conduction hole 20 . A hot water introduction hose 27 and a hot water outlet hose 28 connected to a cooling water passage of an engine (not shown) are connected to one and the other of the hose joints 23 and 24, respectively.
[0018]
Next, the operation of this embodiment will be described.
[0019]
During operation of an engine (not shown) equipped with the carburetor C, a part of the cooling water (warm water) flowing through the cooling water channel flows into the warm water chamber 25 from the warm water introduction hose 27 and passes through the warm water outlet hose 28 and passes through the engine coolant channel. The heat conducting member 21 is heated by recirculating to. The heated bolt portion 22 of the heat conduction member 21 is screwed into the heat conduction hole 20 of the vaporizer body 1 over a length that is more than half of the heat conduction hole 20. Since an extremely wide contact surface is formed, effective heat conduction is performed from the heat conducting member 21 to the vaporizer body 1. Therefore, even when cold, the carburetor body 1, particularly the intake passage 2, the slow nozzle 8 and the throttle valve 4 close to the heat conducting member 21, can be quickly heated, so that moisture freezes on them. That is, it is possible to prevent icing, avoid large changes in the effective low speed opening of the throttle valve 4 and the effective opening area of the slow nozzle 8 due to icing, and ensure normal low speed operation of the engine.
[0020]
In addition, since the screw machining of the bolt portion 22 and the heat conduction hole 20 of the heat conduction member 21 and the machining accuracy management thereof are extremely easy, a large heat conduction surface between the heat conduction member 21 and the vaporizer body 1 can be accurately obtained during mass production. It becomes possible to ensure well, and the heating performance for the vaporizer C can be stabilized.
[0021]
Further, since the hot water chamber 25 is formed in the heat conducting member 21, there is no need to interpose a seal member between the heat conducting member 21 and the vaporizer body 1 for preventing water leakage, and the heat conducting member. 21 is attached to the carburetor main body 1 by screwing the bolt portion 22, so that a special fixing member such as a screw is not required, and simplification of the structure and simplification of the mounting work are brought about. Can do.
[0022]
FIG. 3 shows a second embodiment of the present invention, in which an orifice 26 is provided in a hollow portion of the heat conducting member 21, that is, a hot water flow path. Other configurations are the same as those of the previous embodiment, and in the figure, the same reference numerals are assigned to the corresponding parts to those of the previous embodiment, and the description thereof is omitted.
[0023]
According to this embodiment, by selecting the inner diameter of the orifice 26, the hot water flow rate in the heat conducting member 21 can be adjusted. Therefore, the temperature rise characteristic can be easily adjusted according to the capacity and characteristics of the vaporizer C without changing the inner diameter of the entire hot water flow path of the heat conducting member 21.
[0024]
The present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the invention. For example, the hot water introduction hose 27 can be connected to the hose joint 24 and the hot water lead-out hose 28 can be connected to the hose joint 23 so that the flow direction of the hot water can be reversed to that in the embodiment. In the second embodiment, the orifice 26 can be formed separately from the heat conducting member 21 and can be fitted into one hollow portion of the hose joints 23 and 24.
[0025]
【The invention's effect】
As described above, according to the first feature of the present invention, the heat conducting member is formed in the shape of a hollow shaft having the hollow portion as a hot water chamber, and hose joints are formed at both ends thereof. Since the part was fixed to the heat conduction hole formed in the vaporizer by screwing over the length of more than half of the heat conduction hole, the engine cooling water (warm water) was circulated to the warm water chamber through the hose joint. Sometimes, effective heat conduction from the heat conduction member to the vaporizer body can be generated through a screwed portion having a very wide contact surface between the heat conduction member and the vaporizer, and thus even in a cold state, the vaporizer In particular, the temperature of the part close to the heat conducting member can be quickly raised to prevent icing. Moreover, since it is extremely easy to thread the heat conduction member and the heat conduction hole that are screwed together and to control the machining accuracy, it is necessary to ensure a wide heat conduction surface between the heat conduction member and the vaporizer with high accuracy during mass production. Can contribute to stabilizing the performance of the vaporizer. Further, since the hot water chamber is formed in the heat conducting member, no sealing member is required between the heat conducting member and the vaporizer to prevent water leakage, and the heat conducting member is screwed on itself. Therefore, a special fixing member such as a screw is not necessary, and the structure can be simplified and the mounting operation can be simplified.
[0026]
According to the second feature of the present invention, since the orifice is provided in the flow path from one hose joint to the other hose joint, the flow rate of hot water in the heat conducting member can be adjusted by selecting the orifice, Therefore, various heating performances for the vaporizer can be obtained without changing the flow path diameter of the heat conducting member.
[0027]
Furthermore, according to the third feature of the present invention, a bolt portion that has a huge head for engaging a wrench at one end and is screwed into the heat conduction hole and tightened, and the bolt portion that is connected to both ends of the bolt portion. Since a heat conducting member is formed from a pair of hose joints, and at least the hose joint on the side opposite to the enormous head is formed so as to be able to be inserted into the heat conducting hole, the hose joint on the opposite side to the enormous head of the bolt part is provided. After the heat conduction hole is inserted, the heat conduction member can be easily and reliably attached to the vaporizer by operating a wrench engaged with the enormous head.
[Brief description of the drawings]
FIG. 1 is a partially longitudinal side view of a vaporizer equipped with an icing prevention device according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line 2-2 of FIG.
FIG. 3 is a sectional view similar to FIG. 2, showing a second embodiment of the present invention.
[Explanation of symbols]
C ... Vaporizer 1 ... Vaporizer body 20 ... Heat conduction hole 21 ... Heat conduction member 22 ... Bolt portion 22a ... Huge head 23 ... .... Hose joint 24 ... Hose joint 25 ... Hot water chamber 26 ... Orifice 27 ... Hot water introduction hose 28 ... Hot water outlet hose

Claims (3)

A heat conducting member (21) having a hot water chamber (25) inside and a hose joint (23, 24) connected to the hot water chamber (25) outside is fixed to the vaporizer (C), and the hose joint (23, 24). In the icing prevention device for the vaporizer, in which the hot water is circulated through the hot water chamber (25),
The heat conducting member (21) is formed in a hollow shaft shape having a hollow portion as a warm water chamber (25), and hose joints (23, 24) are formed at both ends thereof, and an intermediate portion of the heat conducting member (21). Is fixed to the heat conduction hole (20) formed in the vaporizer (C) by screwing the heat conduction hole (20) over more than half the length of the heat conduction hole (20). apparatus. In claim 1,
An icing prevention device for a vaporizer, characterized in that an orifice (26) is provided in a flow path in a heat conducting member (21) extending from one hose joint (23) to the other hose joint (24). In claim 1 or 2,
A bolt head (22) having a huge head (22a) for engaging a wrench at one end, screwed into the heat conduction hole (20), and tightened, and connected to both ends of the bolt section (22). A heat conducting member (21) is composed of the pair of hose joints (23, 24), and at least the hose joint (24) on the opposite side of the enormous head (22a) can be inserted into the heat conducting hole (20). An anti-icing device for a vaporizer, characterized by being formed.

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