JP2000192856A - Lpg regulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent impurity such as tar caught at a filter from falling inside a regulator when exchanging the filter, thereby preventing deterioration of pressure regulating function of the regulator and measuring function of a fuel measuring device for idling. SOLUTION: A cylindrical filter 19 with a bottom is provided to an upstream fuel passage 17 for idling of a fuel measuring device 21 for idling, LPG fuel is filtered from an inside of cylinder of the filter 19 to an outside, and an opening end 19a is designed to be taken first. By this construction, filtered impurity such as tar does not spill when exchanging the filter 19. Accordingly, the impurity such as tar is prevented from adhering to a regulator component, whereby a regulator 1 can be realized which prevents deterioration of pressure regulating function and measuring function.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LPG regulator for an internal combustion engine (hereinafter simply referred to as "regulator").
More specifically, the present invention relates to a technology for removing impurities such as tar in fuel generated in a regulator.

[0002]

2. Description of the Related Art Conventionally, LPG fuel supplied to an internal combustion engine driven by LPG fuel is stored in a liquid state in an LPG cylinder, and after most impurities have been removed by a filter, a regulator 100 shown in FIG. Is decompressed and vaporized in the primary decompression chamber 7 and the secondary decompression chamber 8, and supplied to a combustion chamber of an internal combustion engine (not shown) via an LPG vaporizer (not shown). The arrows in the figure indicate the flow of the fuel. The internal combustion engine is driven by the LPG fuel vaporized in the secondary decompression chamber 8 during normal operation at medium to high speeds, and is provided with a slow fuel branched from the primary decompression chamber 7 during idling and slow operation. It is driven by the fuel passing through the passage 17. In the middle of the slow fuel passage 17, a slow fuel passage 17 is provided.
An opening / closing valve 18 for opening and closing is provided, and is configured to open and close the slow fuel passage 17 by an electric signal from an exhaust gas control device (not shown) at the time of deceleration or the like to save fuel.

[0003] Downstream of the on-off valve 18 is provided a slow fuel metering device 21 for adjusting the slow fuel amount. The taper portion 2 at the tip of an adjusting screw 21a of the slow fuel metering device 21 is provided.
The fuel amount is adjusted by increasing / decreasing the minute annular gap between 1b and the slow fuel passage measuring section 17b. However, since the small annular gap is as small as about 50 μm, when the LPG fuel is decompressed and vaporized, impurities such as tar contained in the LPG fuel remain in a liquid state without vaporizing,
It adheres to the minute annular gap and gradually reduces the opening area. As a result, the amount of slow fuel becomes insufficient and the engine speed decreases, and in the worst case, the engine stops. Therefore, the adjusting screw 21a of the slow fuel metering device 21 needs to be adjusted frequently, which takes much time and effort.

[0004] Accordingly, Japanese Patent Application No. Hei.
Japanese Patent No. 3849 discloses an application for improving the above-mentioned disadvantages. Same function as the above publication (partially different in structure)
This will be described below with reference to FIG. The slow fuel passage 17 branches from the primary pressure reducing chamber 7,
A filter 31 is provided in the slow fuel passage 17 between the primary pressure reducing chamber 7 and the on-off valve 18. The filter 31 is composed of a filter body 31a and a filter element 31b. The filter body 31a is formed in a cylindrical shape having a flange 31c, and a filter element 31b made of a sintered alloy or polyvinyl formal (PVF) sponge is provided inside the cylinder. Is L
It has a so-called cartridge type structure in which the PG fuel is press-fitted so as not to jump out of the filter body by the pressure. Flange 31c of filter body 31a and slow fuel passage 1
An O-ring (seal member) 32 is mounted between the stepped portion 17a provided on the base 7 and the airtightness between the outer periphery of the filter body 31a and the slow fuel passage 17 is maintained by being pressed by the on-off valve 18. It is configured as follows.

[0005]

However, when the filter 31 is replaced, when the filter 31 is detached, impurities such as tar collected on the upstream portion of the filter 31 become upstream of the filter 31, that is, the primary decompression chamber. 7 falls on the primary pressure reducing valve 10 and adheres to the regulator 11.
There is a possibility that the pressure regulation function of 0 may be impaired. Filter 3
1 falls down, the slow fuel metering device 21
And may adhere to the minute annular gap of the slow fuel metering device 21 to impair the slow fuel metering function. Therefore, when replacing the filter, the present invention does not allow the impurities such as tar collected by the filter to fall into the regulator, and therefore provide a regulator pressure regulating function and a slow fuel metering function of the slow fuel metering device. It is an object to provide an LPG regulator that does not impair.

[0006]

According to a first aspect of the present invention, a slow fuel passage branched from a primary pressure reducing chamber is provided with a slow fuel metering device provided in the passage. In the LPG regulator which is guided to the main fuel passage during normal operation and provided in a slow fuel passage between the primary pressure reducing chamber and the slow fuel metering device, the filter has a bottomed cylindrical shape. And arranged so as to filter the fuel from the inside to the outside of the filter, and configured to be able to be taken out first from the open end of the filter formed into the bottomed cylindrical shape. I do. The invention of claim 2 is characterized in that the filter assembly containing the filter formed in the shape of a bottomed cylinder is fixed separately to the regulator body.

[0007]

As described above, according to the first aspect of the present invention, 1
A cylindrical filter with a bottom was installed between the primary pressure reducing chamber and the slow fuel metering device in the slow fuel passage branched from the secondary pressure reducing chamber, and the fuel was filtered from the inside to the outside of the filter. Therefore, impurities such as tar contained in the fuel are filtered and collected inside the cylinder having the bottomed cylindrical filter. Further, since the filter is configured to be able to be taken out from the opening end of the filter earlier, it is possible to exchange the impurities such as the filtered tar without spilling outside the cylinder. According to the second aspect of the present invention, since the filter assembly containing the filter is fixed to the regulator body separately, there is no need to disassemble the regulator body when replacing the filter. Filter replacement can be performed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing the function of an LPG regulator according to an embodiment of the present invention, and shows a schematic view of a filter assembly. FIG. 2 is a front view in which the filter assembly of the LPG regulator according to one embodiment of the present invention is mounted. FIG. 3 is a cross-sectional view showing a mounted filter assembly according to an embodiment of the present invention. In FIG. 1, a regulator body 1a of a regulator 1 has an inlet 2 for introducing LPG fuel sent from a not-shown LPG cylinder through a not-shown filter,
An outlet 3 for sending the vaporized fuel to an LPG vaporizer (not shown) is provided. A partition 4 that divides the regulator main body 1a into two, and first and second diaphragms 5 and 6 provided inside the primary pressure reducing chamber 7 are provided. A secondary decompression chamber 8 is formed.

A partition 4 on the primary decompression chamber 7 side has inlets 2 and 1
A first lever 11 having a primary pressure reducing valve 10 for opening and closing the first passage 9 between the secondary pressure reducing chamber 7 and the secondary pressure reducing chamber 7 is rotatably supported. The primary pressure reducing valve 10 is fixed to the distal end of the short arm of the first lever 11, and the distal end of the long arm is engaged with the first diaphragm 5. The first diaphragm 5 is pressed by the first spring 12 in a direction in which the primary pressure reducing valve 10 opens, and the pressure in the primary pressure reducing chamber 7 increases with the inflow of the LPG fuel, and the first diaphragm 12 resists the first spring 12. As the first diaphragm 5 expands outward, the primary pressure reducing valve 10 closes the first passage 9, and opens the first passage 9 when the LPG fuel in the primary pressure reducing chamber 7 is consumed. The pressure in the primary decompression chamber 7 is configured to be kept constant.

The partition 4 on the side of the secondary pressure reducing chamber 8 has a secondary pressure reducing valve 14 for opening and closing the second passage 13 between the primary pressure reducing chamber 7 and the secondary pressure reducing chamber 8. The second lever 15 is pivotally supported so as to be rotatable. The secondary pressure reducing valve 14 is fixed to the distal end of the short arm of the second lever 15, and the distal end of the long arm is engaged with the second diaphragm 6. The second diaphragm 6 is pressed by the second spring 16 in a direction in which the secondary pressure reducing valve 14 is closed. As the LPG fuel is consumed from the outlet 3, the pressure in the secondary pressure reducing chamber 8 decreases and the second spring 16 The second pressure reducing valve 14 opens the second passage 13 as the second diaphragm 6 contracts inward against the second pressure reducing valve 16,
The LPG fuel in the primary decompression chamber 7 flows into the secondary decompression chamber 8 and is configured to keep the pressure in the secondary decompression chamber 8 constant.

A slow fuel passage 17 branches from the primary decompression chamber 7, and an open / close valve 18 is provided in the slow fuel passage 17. A filter 19 is provided in the slow fuel passage 17 upstream of the slow fuel metering device 21 provided downstream of the on-off valve 18. Hereinafter, description will be made with reference to the mounting diagram of the filter assembly shown in FIG. The filter 19 is formed in a cylindrical shape with a bottom, and an open end 19 a is provided on the bottom 19
b is located downstream. The downstream side of the bottom 19b of the filter 19 is supported by an elastic member 20, and the other end of the elastic member 20 is connected to a filter housing 22.
And urges the filter 19 upstream. The upstream open end 19 a of the filter 19 abuts on a filter cover 23 fixed to the filter housing 22 via a seal member 28, and the open end 19 a of the filter 19 is provided.
The filter cover 23 is held in close contact with the filter cover 23 so that impurities such as tar accumulated in the filter 19 do not leak to the outside. Also, by removing the filter cover 23,
The filter 19 is configured to be able to be taken out first from the open end 19a. The filter assembly 30 including the filter 19 and the slow fuel metering device 21 is fixed to the regulator body 1a via the bracket 24 separately from the regulator body 1a, and the slow fuel passage 17 is connected to the hose 2
5 and 26 communicate with the regulator main body 1a (see FIGS. 1 and 2). The filter assembly 3
0 may be built in the regulator body 1a.

Next, the operation of this embodiment will be described with reference to FIGS.
This will be described with reference to FIG. When the LPG fuel is decompressed and vaporized in the primary decompression chamber 7, impurities such as liquid tar generated by LPG fuel are L
While flowing into the slow fuel passage 17 together with the PG fuel, only impurities such as liquid tar are filtered out inside the cylinder of the filter 19, and the LPG fuel passes through the bottom 19b of the filter 19,
After being adjusted by the slow fuel metering device 21, the main fuel passage 27
Via an outlet 3 to an LPG vaporizer (not shown) (see FIGS. 1 and 3). Open end 19a of filter 19
Since the filter cover 23 and the filter cover 23 are in close contact, impurities such as tar accumulated in the filter 19 are surrounded by the filter cover 23 and the filter 19 and do not leak to the outside (see FIG. 3). The filter 19 is a filter cover 2
3 is removed, and the opening end 19a of the protruding filter 19 is picked up by hand and taken out.
The impurities such as tar accumulated inside the cylinder of No. 9 can be replaced without spilling to the outside of the cylinder.

[0013]

The present invention has the following effects because it is configured as described above. That is, a bottomed cylindrical filter for removing impurities such as tar is provided upstream of the slow fuel metering device in the slow fuel passage branched from the primary pressure reducing chamber, and the fuel is filtered from the inside to the outside of the filter. In addition, the filter can be replaced without spilling impurities such as tar, etc., into the regulator main body because the filter is configured such that the opening end of the filter can be taken out first when the filter is replaced. Therefore, the adhesion of impurities such as tar to the regulator parts can be prevented, so that the fuel pressure regulation function and fuel regulation function are not impaired. further,
Since the filter assembly is fixed to the regulator main body separately from the regulator main body, there is no need to disassemble the regulator main body when replacing the filter, so that the pressure adjusting function and the measuring function of the regulator are not impaired.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing functions of an LPG regulator according to one embodiment of the present invention.

FIG. 2A is an LPG according to an embodiment of the present invention.
FIG. 4 is a front view of a state where the filter assembly is mounted on the regulator. FIG. 2B is a right side view of FIG.

FIG. 3 is a cross section AA of FIG. 2 (a).

FIG. 4 is a longitudinal sectional view of an LPG regulator showing a conventional technique.

FIG. 5 is a longitudinal sectional view of an LPG regulator showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 LPG regulator 1a Regulator main body 7 Primary pressure reducing chamber 17 Slow fuel passage 19 Filter 19a Open end 19b Bottom 21 Slow fuel metering device 27 Main fuel passage 30 Filter assembly

Claims (2)

[Claims] A slow fuel passage branched from a primary pressure reducing chamber is guided to a main fuel passage during normal operation via a slow fuel metering device provided in the passage, and the primary pressure reducing chamber and the primary pressure reducing chamber are connected to each other. In an LPG regulator provided with a filter in a slow fuel passage between the slow fuel meter and the slow fuel metering device, the filter is formed in a cylindrical shape having a bottom and arranged so as to filter fuel from the inside to the outside of the filter. And an LPG regulator characterized in that the filter formed in a cylindrical shape with a bottom can be taken out first from an opening end. 2. The LPG regulator according to claim 1, wherein the filter assembly containing the filter formed in a bottomed cylindrical shape is fixed to a regulator body separately.