JPH064056Y2 - LPG vaporizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an LPG vaporizer, and more particularly to a fuel mixture supply passage for idle-up in an idle-up mechanism.

[Prior art]

Conventionally, the throttle body in the LPG vaporizer is equipped with an idle-up mechanism, and the fuel mixture supply path for idle-up has its discharge port 1 with a throttle valve 2 as shown in FIGS. 5 and 6. The maximum opening / closing edge 2 of the throttle valve 2 which is provided so as to open to the intake passage 3 in the downstream portion of the throttle valve 1 and whose opening position of the discharge port 1 is generally farthest from the throttle shaft 4.
It is set to part a.

[Problems to be solved by the present invention]

By the way, the L when the LPG fuel mixture depressurized and vaporized by the regulator passes through the throttle valve 2 in the intake passage.
The flow rate of the PG fuel mixture becomes maximum at the maximum opening / closing edge 2a of the throttle valve 2 and decreases from that portion to the throttle shaft 4 portion. Therefore, the state of adhesion of carbon and sludge contained in the LPG fuel to the inner wall surface of the intake passage is distributed as a range A shown by dots in FIGS. 5 and 6.

Therefore, the discharge port 1 of the fuel mixture for idle-up
In the case where the above-mentioned conventional position is set, the carbon or sludge adheres to a part of the discharge port,
There is a problem that the reverse flow from 1a causes the set flow rate of the fuel mixture for idle-up to be changed by adhering to the inside of the fuel mixture for idle-up supply or adhering to the control valve and causing a malfunction of the control valve. is there.

Therefore, the present invention aims to solve the above problems by setting the discharge port at a position where carbon or sludge does not adhere.

[Means for Solving the Problems]

In order to solve the above problems, the first aspect of the present invention is to provide an idle-up fuel mixture supply passage for supplying the idle-up fuel mixture to the intake passage downstream of the throttle valve. In this case, the discharge port of the supply passage is opened on the inner wall surface of the intake passage located on the side of the throttle valve 8 that opens upward with respect to the throttle shaft and near the lower portion of the throttle shaft. According to a second aspect of the invention, the directivity angle of the discharge port into the intake passage is set so that the center extension line of the discharge port intersects with the inner wall surface of the intake passage near the center of the outer edge of the throttle valve that opens downward. It is characterized by.

[Function and effect of device]

The flow rate of the LPG fuel mixture flowing in the intake passage 7 is controlled by the opening degree of the throttle valve 8, and the flow rate of the downward opening side 8b of the throttle valve 8 is the upward opening side 8a.
More than the flow rate of. Therefore, the distribution of adhesion of carbon and sludge contained in the LPG fuel to the inner wall surface of the intake passage is in the range A shown by dots in FIGS. 3 and 4,
The amount of carbon or sludge adhered is extremely small in the lower part of the mounting portion of the throttle shaft 14 on the inner wall surface of the intake passage and in a part B from that portion to the upward opening side of the throttle valve 8.

In the present invention, the discharge port 11a of the fuel mixture passage 11 for idle-up is set on the inner wall surface of the intake passage in the range B where the amount of carbon or sludge attached is extremely small.
Carbon or sludge adheres to the discharge port 11a, reversely flows from the discharge port 11a and is deposited in the fuel mixture supply passage 11 for idle-up, and further deposited on the control valve. It is possible to prevent a change in the set flow rate of the fuel mixture for idle-up and a malfunction of the control valve.

Further, the directivity angle of the discharge port into the intake passage is set so that the center extension line of the discharge port intersects with the inner wall surface of the intake passage near the center of the outer edge of the throttle valve on the downward opening side. The jet of the fuel mixture for idle-up that is discharged from the discharge port 11a hits the inner wall surface of the intake passage where a large amount of carbon and sludge adheres, and the jet removes the carbon and sludge, resulting in the adhesion of carbon. It is possible to prevent the malfunction of the opening operation of the throttle valve 8 caused by.

〔Example〕

Next, an embodiment of the present invention shown in FIGS. 1 to 4 will be described.

Reference numeral 5 denotes a throttle body, in which the LPG fuel decompressed and vaporized by the LPG regulator flows from the main nozzle 6 into the intake passage 7 and is mixed with air so that the air-fuel mixture is flow controlled by the throttle valve 8. .
Reference numerals 9 and 10 denote bypass passages for supplying a fuel mixture for idle-up. One ends 9a and 10a of the bypass passages open to the intake passage 7 upstream of the throttle valve 8, and the other ends 9b and 10b of the bypass passages are used for idle-up. It communicates with the fuel mixture supply passage 11. One of the bypass passages 9 is provided with a solenoid valve 12 that operates in association with an air conditioner switch, and the valve body 12a opens the bypass passage 9 when an electric load is generated by operating the air conditioner. The other bypass passage 10 is provided with an electromagnetic valve 13 that operates in association with a light switch, and the valve body 13a opens the bypass passage 10 when an electric load is caused by lighting the light. The discharge port 11a of the fuel-air mixture supply passage 11 for idle-up is open to the intake passage 7 downstream of the throttle valve 8. The discharge port
As shown in FIG. 3 and FIG. 4, the opening position of 11a is an opening 8a that opens upward of the throttle valve 8 around the throttle shaft 14 and an inner wall surface of the intake passage located near the lower portion of the throttle shaft 14. Is set to.

Further, as shown in FIG. 4, the directivity angle of the discharge port 11a toward the intake passage 7 is such that the center extension line 11b of the discharge port 11a is slightly discharged from the center of the outer edge of the downward opening side 8b of the throttle valve 8. It is set so as to intersect with the inner wall surface of the intake passage located on the 11a side.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a throttle body portion showing an embodiment of the present invention, and FIG. 2 is a bottom view of the same partially broken throttle body. 3 and 4 show the opening position of the discharge port of the present invention. FIG. 3 is a side sectional view and FIG. 4 is a sectional view taken along line IV-IV in FIG. 5 and 6 show the opening position of the conventional discharge port.
The drawing is a side sectional view, and FIG. 6 is a sectional view taken along line VI-VI in FIG. 7 ... Intake passage, 8 ... Throttle valve, 8a ... upward opening side, 8b ... downward opening side, 11 ... Fuel mixture supply path for idle up, 11a ... Discharge port, 14 ... Throttle shaft

Claims (2)

[Scope of utility model registration request] 1. A fuel mixture supply passage for idle up for supplying a fuel mixture for idle up to an intake passage downstream of a throttle valve, wherein the outlet of the supply passage is provided with a throttle valve. An LPG vaporizer characterized by being opened on an inner wall surface of an intake passage located on the side of the throttle valve 8 which opens upward with respect to the shaft and near the lower portion of the throttle shaft. 2. A directivity angle of the discharge port into the intake passage,
2. The LPG according to claim 1, wherein the center extension line of the discharge port is set so as to intersect with the inner wall surface of the intake passage near the center of the outer edge of the throttle valve that opens downward.
Vaporizer.