JP2001065792A - Lubricating device in gas fuel filling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent lubricating oil of a lubricating device for a reciprocating compressor from mixing into gas fuel filled in a fuel tank when the gas fuel is compressed by the compressor to be filled in the fuel tank in order to prevent waste consumption of lubricating oil, and to keep an aspect of combustion gas good in combustion of the gas fuel filled in the fuel tank. SOLUTION: This lubricating device is provided: a gas fuel feeding-out passage 47 capable of feeding out gas fuel 3 compressed in the compressor 8 toward the fuel tank 4; an oil reservoir portion 68 capable of retaining lubricating oil 67 fed out of the compressor 8 after lubrication of a lubricated portion of the compressor 8; an oil pump 70 sucking the lubricating oil 67 in the oil reservoir portion 68 to supply the lubricating oil 67 to the lubricated portion of the compressor 8; an oil separator 80 disposed at a halfway point in the gas fuel feeding-out passage 47; and an oil returning passage 81 returning the lubricating oil 67 separated by the oil separator 80 to a suction side of the oil pump 70.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas fuel filling apparatus in which gas fuel introduced from a gas fuel supply source is compressed by a compressor and the gas fuel is filled in a stationary or vehicle-mounted fuel tank. More specifically, the present invention relates to a lubricating device in a gas fuel filling device in which lubricating oil mixed in gas fuel in the compressor is separated from the gas fuel.

[0002]

2. Description of the Related Art There is a lubricating device in the above-mentioned gas fuel filling device which is conventionally constituted as follows.

That is, a lubricating device in the above gas fuel filling device comprises a reciprocating compressor capable of compressing a gas fuel introduced from a gas fuel supply source such as a stationary gas tank, and a gas compressed by the compressor. A gas fuel lead-out passage that allows the fuel to be drawn out toward a stationary or on-board fuel tank, and an oil reservoir that can store lubricating oil that is drawn out of the compressor after lubrication of the lubricated part of the compressor. An oil pump for sucking lubricating oil from the oil reservoir and supplying the lubricating oil to a lubricated portion of the compressor.

[0004] When the compressor is operated, the gas fuel compressed by the compressor is led out to the fuel tank through the gas fuel lead-out passage and filled in the fuel tank.

The gas fuel filled in the fuel tank is
It is used for combustion for various purposes such as driving a vehicle.

[0006]

According to the above-mentioned prior art, a part of the lubricating oil supplied to the lubricated portion of the compressor is applied to the inner peripheral surface of the cylinder of the compressor and the inner peripheral surface. It tends to pass through the gap between the sliding piston and the gas fuel compressed by the compressor.

Therefore, the lubricating oil is unnecessarily consumed in addition to the lubrication, which is not preferable. Further, when the gas fuel in the fuel tank is used for combustion, the lubricating oil mixed therein is Due to incomplete combustion, there is a possibility that the properties of the combustion gas may be deteriorated.

The present invention has been made in view of the above circumstances. When gas fuel is compressed by a reciprocating compressor and charged into a fuel tank, the charged gas fuel is supplied to the compressor. To prevent the lubricating oil from being mixed in the lubricating device, so that the lubricating oil is not wastefully consumed, and in the combustion of the gas fuel filled in the fuel tank, the properties of the combustion gas are kept good. The task is to

Further, the lubrication of the compressor by the lubricating device is prevented from being disturbed by the gaseous fuel compressed by the compressor so that good lubrication is maintained. The task is to make it compact.

[0010]

The lubricating device in the gas fuel filling apparatus according to the present invention for solving the above-mentioned problems is as follows.

A first aspect of the present invention is a reciprocating compressor 8 capable of compressing a gas fuel 3 introduced from a gas fuel supply source 2, and a stationary or on-board gas fuel 3 compressed by the compressor 8. A gas fuel lead-out passage 47 that can be drawn out toward the fuel tank 4 of the compressor, and an oil reservoir 68 that can store a lubricating oil 67 drawn out of the compressor 8 after lubrication of the lubricated part of the compressor 8. , The lubricating oil 67 in the oil reservoir 68
And a lubricating device in a gas fuel filling device including an oil pump 70 for supplying the lubricating oil 67 to the lubricated portion of the compressor 8.

An oil separator 80 provided in the middle of the gas fuel outlet passage 47; an oil return passage 81 for returning the lubricating oil 67 separated by the oil separator 80 to the suction side of the oil pump 70; It is provided with.

According to a second aspect of the present invention, in addition to the first aspect, an oil on-off valve 82 for opening and closing the oil return passage 81 is provided.
When the pressure of the gas fuel 3 on the discharge side of the compressor 8 is equal to or higher than a predetermined value, the oil on-off valve 82 is closed.

The invention according to claim 3 is the invention according to claim 1 or 2
In addition to the invention, an oil opening / closing valve 82 for opening and closing the oil return passage 81 is provided, and when the compressor 8 stops operating, the oil opening / closing valve 82 is closed.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a gas fuel filling device. The gas fuel filling device 1 compresses a gas fuel 3 introduced from a gas fuel supply source 2 such as a stationary gas tank. The gas fuel 3 is led out to a stationary or on-vehicle fuel tank 4 so that the fuel tank 4 can be filled.

The gas fuel filling device 1 includes an introduction pipe device 7 for introducing the gas fuel 3 from the gas fuel supply source 2 and a reciprocating compression type for compressing the gas fuel 3 introduced by the introduction pipe device 7. A compressor 8, an outlet pipe device 9 for allowing the gas fuel 3 compressed by the compressor 8 to be led out toward the fuel tank 4, and a driving unit for driving the compressor 8, An internal combustion engine 10 as fuel,
A lubricating device 11 for lubricating the compressor 8;
A cooling device 12 for water-cooling the engine and the internal combustion engine 10, a control device 13 for electronically controlling each component of the gas fuel filling device 1, and a housing 14 for housing these 7 to 13 as a whole. ing.

The introduction pipe device 7 has a gas fuel introduction passage 16 formed by an inner hole of a pipe material. One end (upstream end) of the gas fuel introduction passage 16 is connected to the gas fuel supply source 2 through the coupler 17, and the other end (downstream end) is connected to the suction side of the compressor 8. I have. The introduction pipe device 7 includes a flow control valve 18, a one-way valve 19, a dehumidifier 20, and a filter 21, which are sequentially provided in the gas fuel introduction passage 16 in the middle from the one end to the other end. The gas fuel 3 of the gas fuel supply source 2 is introduced into the compressor 8 through these 16 to 21.

In FIG. 2, the compressor 8 is
A crankcase 25 supported by the crankcase 25 and a crankshaft 28 housed in a crankcase 26 in the crankcase 25 and supported by the crankcase 25 so as to be rotatable around a substantially horizontal axis 27. Four (plural) first to fourth cylinders 29 to 32 projecting from the crankcase 25 are provided. Each of these cylinders 29
32 are disposed at substantially equal angles in the circumferential direction of the shaft center 27, and radially protrude from the crankcase 25 so as to extend radially outward with the shaft center 27 as a center. . The other end of the gas fuel introduction passage 16 of the introduction pipe device 7 is communicated with the crank chamber 26.

Each of the cylinders 29 to 32 has a cylinder body 34 projecting from the crankcase 25, a piston 35 slidably fitted in a cylinder hole in the cylinder body 34 in the axial direction, and a A connecting rod 36 for interlockingly connecting the piston 35 to the crankshaft 28
A compression chamber 37 surrounded by the protruding end of the cylinder body 34 and the piston 35; and a one-way intake valve 38 and a one-way discharge valve 39 for communicating the compression chamber 37 with the outside. ing. The first to fourth cylinders 29 to 3
2 is that the bore diameter is gradually reduced in this order, and
The strokes of the pistons 35 are substantially the same.

The compressor 8 is connected to the crank chamber 2.
A first fuel passage 41 which communicates with the compression chamber 37 of the first cylinder 29 in cooperation with the one-way valve 38 for suction;
A second fuel passage 42 for communicating the compression chamber 37 of the cylinder 29 with the one-way valve 39 for discharge and the one-way valve 38 for suction of the second cylinder 30 to communicate with the compression chamber 37 of the second cylinder 30; A third fuel passage 43 which communicates the compression chamber 37 of the second cylinder 30 with the one-way valve 39 for discharge and the one-way valve 38 for suction of the third cylinder 31 to communicate with the compression chamber 37 of the third cylinder 31; The compression chamber 37 of the third cylinder 31 is connected to the one-way discharge valve 39 and the fourth cylinder 3.
2 in cooperation with the one-way valve 38 for suction of the fourth cylinder 3.
And a fourth fuel passage 44 communicating with the second compression chamber 37. Each of the communication passages 41 to 44 is formed by an inner hole of a pipe material. Further, a safety valve 45 is provided so that the pressure in the crank chamber 26 does not exceed a predetermined pressure.

In FIGS. 1 and 2, the outlet pipe device 9 comprises:
A gas fuel outlet passage 47 formed by an inner hole of the pipe material is provided. One end (upstream end) of the gas fuel outlet passage 47 is communicated with the compression chamber 37 of the fourth cylinder 32 through a one-way discharge valve 39, and the other end (downstream end).
Is connected to the fuel tank 4 through a coupler 48. The outlet pipe device 9 includes a one-way valve 49 provided at an intermediate portion from one end to the other end of the gas fuel outlet passage 47, and a gas fuel outlet passage on the discharge side of the compressor 8. A temperature detection sensor 50 and a pressure detection sensor 51 for detecting the temperature and pressure of the gas fuel 3 passing through the middle part of the gas fuel 47 are provided.

When the compressor 8 is operated, the gas fuel 3 in the crank chamber 26 is supplied to the respective one-way intake valves 3.
8, the pressure is increased while being successively passed to the compression chambers 37 of the first to fourth cylinders 29 to 32 through the discharge one-way valve 39 and the fuel passages 41 to 44, and the gas fuel 3 is stored in the fourth cylinder 32. When it reaches the compression chamber 37, it is compressed to a sufficiently high pressure. The gas fuel 3 in the compression chamber 37 of the fourth cylinder 32 is supplied to the gas fuel outlet passage 47,
The fuel tank 4 is led out through the one-way valve 49 and the coupler 48 toward the fuel tank 4 and filled in the fuel tank 4.

In FIG. 1, the internal combustion engine 10 has an internal combustion engine main body 54 having another crankshaft 53 for linking the crankshaft 28 of the compressor 8 and an intake air communicating with the suction side of the internal combustion engine main body 54. A passage 55, an air cleaner 56 communicated with an upstream end of the intake passage 55,
Throttle valve 5 provided in the middle of intake passage 55
7 and an actuator 58 for setting the throttle valve 57 to a desired throttle opening. The actuator 58 may be of any type, such as pneumatic, hydraulic, electric, or electromagnetic. The same applies to the following actuators.

The internal combustion engine 10 has a fuel supply means 59 for supplying the gas fuel 3 from the gas fuel supply source 2 into the intake passage 55. The fuel supply means 59 is connected to the fuel supply passage 6 communicating with the intake passage 55.
0, and the upstream end of the fuel supply passage 60 is provided with a coupler 6.
1 and communicate with the gas fuel supply source 2.
In the middle of the fuel supply passage 60, a flow control valve 6 is provided.
2 is provided, and an actuator 63 for causing the flow regulating valve 62 to have a desired opening degree is provided.

When the internal combustion engine 10 is driven, air outside the housing 14 is sucked into the internal combustion engine main body 54 through the air cleaner 56, the intake passage 55, and the throttle valve 57, and the coupler 61, the fuel supply passage 60 The gaseous fuel 3 is sucked into the internal combustion engine main body 54 through the flow control valve 62 and is provided for combustion together with the air. The driving force is output from the crankshaft 53 by the energy generated by the combustion, and the compressor 8 is operated.

In FIG. 1, the lubricating device 11 includes a lubricating oil 67 derived from the crank chamber 26 side of the compressor 8.
Reservoir 68 for storing oil, an oil supply oil passage 69 for communicating the oil reservoir 68 with a lubricated portion such as a bearing portion of the compressor 8, and an oil supply oil passage 69 provided at an intermediate portion of the oil supply oil passage 69. The lubricating oil 67 in the oil reservoir 68 is passed through the oil supply oil passage 69.
While the oil pump 70 supplies the lubricating oil 67 to the lubricated portion of the compressor 8, a flow control valve 71 and a one-way valve 72 provided at an intermediate portion of the oil supply oil passage 69.
And an oil level sensor 73 for detecting the storage amount of the lubricating oil 67 in the oil reservoir 68.

The oil reservoir 68 is provided at an intermediate portion of the oil supply oil passage 69 separately from the oil reservoir recess 74 formed at the inner bottom of the crankcase 25 and the crankcase 25. An oil tank 75 is provided, and the oil level sensor 73 is provided in the oil tank 75. Also,
The oil pump 70 includes a first pump 76 that supplies the lubricating oil 67 in the oil reservoir recess 74 to the oil tank 75 through the oil supply oil passage 69, and a first pump 76 that supplies the oil tank 75 through the oil supply oil passage 69. A second pump 77 that supplies lubricating oil 67 to the lubricated portion of the compressor 8 is provided.

The lubricating device 11 includes an oil separator 80 provided in the middle of the gas fuel outlet passage 47 of the outlet pipe device 9 and an inner bottom of the oil separator 80 connected to the oil pump 70. An oil return passage 81 formed by an inner hole of a pipe material communicating with the crank chamber 26 on the suction side, an oil on-off valve 82 for opening and closing the oil return passage 81, and opening and closing the oil on-off valve 82 Actuator 8 to enable valve operation
3 is provided. The temperature detection sensor 50 is disposed upstream of the oil separator 80 in the gas fuel discharge passage 47, and the pressure detection sensor 51 is disposed downstream of the oil separator 80 in the gas fuel discharge passage 47. Has been established.

The first and second pumps 7 of the oil pump 70
When the motors 6 and 77 are driven, the oil sump recess 74 of the oil sump 68 and the lubricating oil 67 of the oil tank 75 are supplied to the lubricated part of the compressor 8 to perform predetermined lubrication. The lubricating oil 67 after the lubrication passes through the crank chamber 26 and is stored in the oil reservoir concave portion 74, and thereafter, the above-described lubricating action is repeated.

Here, a part of the lubricating oil 67 supplied to the lubricated portion of the compressor 8 comes into sliding contact with the inner peripheral surface of the cylinder hole in the cylinder body 34 of the compressor 8. The gas passes through the gap between the piston 35 and the gas fuel 3 compressed in the compression chamber 37 of the compressor 8.

Thereafter, when the gas fuel 3 compressed by the compressor 8 is led out to the fuel tank 4 through the gas fuel outlet passage 47 of the outlet pipe device 9, the gas fuel 3 is mixed with the gas fuel 3. The lubricating oil 67 is captured by the oil separator 80 and separated from the gaseous fuel 3, and returns from the inner bottom of the oil separator 80 to the crank chamber 26 through the oil return passage 81 and the oil on-off valve 82. And is provided for lubrication again.

According to the above configuration, the lubricating device 11 includes the oil separator 80 provided at an intermediate portion of the gas fuel outlet passage 47.
And an oil return passage 81 for guiding the lubricating oil 67 separated by the oil separator 80 back to the suction side of the oil pump 70.
When the gas fuel 3 is compressed by the compressor 8, even if a part of the lubricating oil 67 for lubricating the compressor 8 is mixed into the gas fuel 3, the lubricating oil 67 The lubricating oil 6 that is captured by the oil separator 80 and separated from the gaseous fuel 3 and is filled in the fuel tank 4
7 is suppressed.

The lubricating oil 67 separated as described above
Is returned to the suction side of the oil pump 70 through the oil return passage 81, and is again provided for lubrication.

Accordingly, the lubricating oil 67 is prevented from being wasted, and when the gas fuel 3 in the fuel tank 4 is used for combustion, the lubricating oil Since the mixing of the lubricating oil 67 is suppressed, the occurrence of incomplete combustion of the lubricating oil 67 is avoided, and the properties of the combustion gas are favorably maintained.

Further, as described above, the oil pump 70
The first pump 76 for supplying the lubricating oil 67 in the oil reservoir concave portion 74 formed in the crankcase 25 to the oil tank 75 is provided. Therefore, the degree of freedom in the arrangement of the oil tank 75 is improved.

The downstream end of the oil return passage 81 is
It may be connected to any one of the oil reservoir concave portion 74, the oil tank 75, and the suction portions of the first and second pumps 76 and 77.
Further, the first pump 76 may not be provided.

In FIGS. 1 and 2, the cooling device 12 comprises:
Each cylinder body 3 of the first to fourth cylinders 29 to 32
Fourth to fourth cooling water jackets 86 to 89 formed in
A cooling water jacket 90 formed in the internal combustion engine main body 54 of the internal combustion engine 10, and first and second heat exchangers 92, which are separated from each other and supported by the crankcase 25.
93, an radiator 95 for air cooling the cooling water, and an air cooling fan 96 driven by the internal combustion engine 10 to send cooling air to the radiator 95.
And

Further, the cooling device 12 includes a first water passage 98 that connects the downstream side of the radiator 95 to the first heat exchanger 92, and a first water passage 9 of the first heat exchanger 92.
8 side, the fourth cooling water jacket 89 and the first heat exchanger 9
2, a second cooling water jacket 88, a second heat exchanger 93, a second cooling water jacket 87, a second heat exchanger 93, and a second water passage 9 that is sequentially communicated with the first cooling water jacket 86.
9 and the first cooling water jacket 86 are connected to the internal combustion engine 1.
Third water passage 10 communicating with cooling water jacket 90
0 and a fourth water passage 101 for connecting the cooling water jacket 90 of the internal combustion engine 10 to the upstream side of the radiator 95.
The cooling water jackets 86 to 89, the first and second heat exchangers 92 and 93 of the intercooler 94, the radiator 95, and the first to fourth water passages 98 to 101 provide a closed cooling water circuit. 104 are formed.

The cooling device 12 cools the cooling water cooled by the radiator 95 along the cooling water circuit 104 from the downstream side of the radiator 95 to the cooling water jackets 86 to 89 of the compressor 8 and the internal combustion engine. A water pump 105 is provided for flowing toward the cooling water jacket 90 and the intercooler 94 of the engine 10 and circulating the cooling water so as to return to the upstream side of the radiator 95. The water pump 105 is provided in the middle of the third water passage 100 and is provided with a speed changing means 106 by the internal combustion engine 10.
, And can be driven. Further, the actuator 1 for setting the transmission means 106 to a desired transmission ratio
07 is provided.

In the first heat exchanger 92, each gas fuel passing through the fourth fuel passage 44 and the gas fuel outlet passage 47 of the outlet pipe device 9 is cooled by the cooling water immediately after being sufficiently cooled by the radiator 95. 3 are each cooled. Further, in the second heat exchanger 93, each gas fuel 3 passing through the second fuel passage 42 and the third fuel passage 43 is cooled by the cooling water, and the filling density of the fuel tank 4 is increased. Further, each of the cooling water jackets 86 to 90
The cooling water passing through each of the cylinders 29 to
The internal combustion engine 32 and the internal combustion engine 10 are each cooled, and the smooth operation of each of the compressor 8 and the internal combustion engine 10 is ensured.

In FIG. 1, the cooling device 12 has a water bypass passage 109 having both ends connected to the cooling water circuit 104 and bypassing the radiator 95, and a cooling water passage 104 which flows through the radiator 95 and the water bypass passage 109, respectively. A water amount adjusting valve 110, which is a linear three-way valve capable of adjusting the amount of cooling water to be adjusted, and an actuator 111 that drives the water amount adjusting valve 110 to make each of the above water amounts a desired amount.

The cooling device 12 has both ends connected to the cooling water circuit 104, respectively.
0, another water bypass passage 113 that bypasses the cooling water jacket 90 of the internal combustion engine main body 54, a water open / close valve 114 that opens and closes the water bypass passage 113, and an actuator 115 that causes the water open / close valve 114 to have a desired opening degree. It has.

In FIG. 3, electric power is supplied to the control device 13 from a generator 117 driven by the internal combustion engine 10. Further, the detection signals of the temperature detection sensor 50, the pressure detection sensor 51, and the oil level sensor 73 are input to the control device 13,
In addition, these detection signals enable the actuators 5 to be used.
8, 63, 83, 107, 111, and 115 are controlled to perform desired operations.

FIG. 4 shows a flow chart of the control device 13, wherein (P-1) to (P-8) show each step of the program.

In FIGS. 1 and 4, when the internal combustion engine 10 is started (P-2) and the compressor 8 is operated in conjunction therewith, the compressor 8 is operated from the gas fuel supply source 2 through the introduction pipe device 7. The gaseous fuel 3 introduced into the crank chamber 26 of the compressor 8 is sequentially compressed by the cylinders 29 to 32 of the compressor 8, and the compressed gaseous fuel 3 passes through the gaseous fuel outlet passage 47 of the outlet pipe device 9. The fuel is drawn out toward the tank 4 and filled in the fuel tank 4.

In the above case, the pressure of the gas fuel 3 in the gas fuel outlet passage 47 on the discharge side of the compressor 8 is detected by the pressure detection sensor 51, and this detection signal is input to the control device 13. .

If the controller 13 determines that the pressure of the gas fuel 3 on the discharge side of the compressor 8 is lower than a predetermined value (P-3), the oil on-off valve 82 is kept open. The lubricating oil 67 which is held (P-4) and tends to accumulate in the inner bottom of the oil separator 80 is supplied to the oil return passage 81 and the oil on-off valve 8.
2 and is returned to the crank chamber 26, from which the oil pump 70 again provides lubrication.

On the other hand, if it is determined in (P-3) that the pressure of the gas fuel 3 on the discharge side of the compressor 8 is higher than a predetermined value, the actuator 83 is driven to drive the oil on-off valve 82 Is closed (fully closed) (P-5).

Therefore, the gaseous fuel 3 having a high pressure equal to or higher than the predetermined value passes through the oil return passage 81 and passes through the oil pump 7.
0 to prevent the oil pump 7
A good lubrication of the compressor 8 by 0 is maintained.

Also, when the operation of the compressor 8 is stopped (P-6) due to the stop of the drive of the internal combustion engine 10 or the like (P-6), the actuator 83 is driven to close the oil on-off valve 82. The valve is fully closed (P-7).

Here, when the operation of the compressor 8 is stopped,
The lubricating oil 67 supplied to the lubricated portion of the compressor 8 is drawn out of the compressor 8 and tries to accumulate in the oil reservoir 68 in a large amount, but as described above, when the compressor 8 is stopped, Since the oil on-off valve 82 is closed, the lubricating oil 67 separated by the oil separator 80 is supplied to the oil pump 7.
Flowing toward the suction side of 0 and the oil reservoir 68 is prevented.

Therefore, the lubricating oil 6 from the oil separator 80
7 does not flow into the oil sump 68, the oil sump 6
8 can be made smaller, and the lubricating device 11 can be made smaller.

FIG. 5 shows the lubricating device 1 of the gas fuel filling device 1.
1 shows another embodiment of the present invention.

According to this, the oil pump 70 is provided with the second pump 77, and the second pump 77 is driven by the internal combustion engine 10, so that the structure of the lubrication device 11 is simplified accordingly. ing.

The lubricating oil 67 is supplied to the compressor 8 by the oil pump 70 in accordance with the operation (rotation speed) of the compressor 8 linked to the internal combustion engine 10.
Lubrication is performed more appropriately.

Since other structures and operations are the same as those of the above-described embodiment, the same reference numerals are given and the description is omitted.

[0058]

The effects of the present invention are as follows.

According to the first aspect of the present invention, there is provided a reciprocating compressor capable of compressing a gas fuel introduced from a gas fuel supply source, and the gas fuel compressed by the compressor is supplied to a stationary or vehicle-mounted fuel tank. A gas fuel outlet passage, a lubricating portion capable of storing lubricating oil derived from the compressor after lubrication of the lubricated portion of the compressor, and a lubricating oil in the oil reservoir. On the other hand, in a lubricating device in a gas fuel filling device including an oil pump that supplies this lubricating oil to a lubricated portion of the compressor,

An oil separator is provided at an intermediate portion of the gas fuel outlet passage, and an oil return passage for returning the lubricating oil separated by the oil separator to the suction side of the oil pump.

Therefore, when the gas fuel is compressed by the compressor, even if a part of the lubricating oil for lubricating the compressor is mixed in the gas fuel, the lubricating oil is captured by the oil separator. Thus, lubricating oil is prevented from being mixed into the gas fuel that is separated from the gas fuel and filled in the fuel tank.

The lubricating oil separated as described above is returned to the suction side of the oil pump through the oil return passage,
Again, it is lubricated.

Accordingly, the lubricating oil is prevented from being wasted, and when the gas fuel in the fuel tank is used for combustion, the lubricating oil is prevented from being mixed into the gas fuel in the fuel tank. Accordingly, the occurrence of incomplete combustion of the lubricating oil is avoided, and the properties of the combustion gas are kept good.

According to a second aspect of the present invention, there is provided an oil on-off valve for opening and closing the oil return passage, and when the gas fuel pressure on the discharge side of the compressor is higher than a predetermined value, the oil on-off valve is closed. It is like that.

Therefore, gas fuel having a high pressure equal to or higher than the above-mentioned predetermined value is prevented from passing through the oil return passage and acting on the oil pump, and good lubrication of the compressor by the oil pump is maintained. You.

According to a third aspect of the present invention, an oil on-off valve for opening and closing the oil return passage is provided, and when the operation of the compressor is stopped, the oil on-off valve is closed.

Here, when the operation of the compressor is stopped, the lubricating oil supplied to the lubricated portion of the compressor is led out of the compressor and tends to accumulate in the oil reservoir. As described above, when the compressor is stopped, the oil on-off valve is closed, so that the lubricating oil separated by the oil separator is prevented from flowing toward the suction side or the oil reservoir of the oil pump. Is done.

Therefore, since the lubricating oil from the oil separator does not flow into the oil reservoir, the capacity of the oil reservoir can be reduced, and the lubricating device can be downsized.

[Brief description of the drawings]

FIG. 1 is an overall diagram of a gas fuel filling device.

FIG. 2 is a detailed sectional view of the compressor.

FIG. 3 is an electric wiring diagram of the gas fuel filling device.

FIG. 4 is a flowchart of the control device.

FIG. 5 is a view showing another embodiment and corresponding to FIG. 1;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 gas fuel filling device 2 gas fuel supply source 3 gas fuel 4 fuel tank 7 introduction pipe device 8 compressor 9 lead pipe device 10 internal combustion engine 11 lubrication device 13 control device 25 crankcase 26 crankcase 47 gas fuel discharge passage 51 pressure detection Sensor 67 Lubricating oil 68 Oil reservoir 69 Oil supply oil passage 70 Oil pump 73 Oil level sensor 80 Oil separator 81 Oil return passage 82 Oil open / close valve

Continuation of front page (72) Inventor Shinichi Kawamura 2500 Shinkai, Iwata-shi, Shizuoka Yamaha Motor Co., Ltd. F-term (reference) 3E072 AA03 DA05 GA30 3H003 AA02 AB07 AC04 BD12 BH05

Claims (3)

[Claims] 1. A reciprocating compressor capable of compressing a gas fuel introduced from a gas fuel supply source, and a gas fuel compressed by the compressor can be led out to a stationary or on-vehicle fuel tank. A gas fuel outlet passage, an oil reservoir for storing lubricating oil derived from the compressor after lubrication of the lubricated portion of the compressor, and a lubricating oil for sucking the lubricating oil of the oil reservoir. In a lubricating device in a gas fuel filling device having an oil pump for supplying oil to a lubricated portion of the compressor, an oil separator interposed in the middle of the gas fuel outlet passage is separated by the oil separator. A lubricating device in a gas fuel filling device, comprising: an oil return passage for returning the lubricating oil to the suction side of the oil pump. 2. An oil on-off valve for opening and closing the oil return passage, wherein the oil on-off valve is closed when a gas fuel pressure on a discharge side of the compressor is equal to or higher than a predetermined value. 2. A lubricating device in the gas fuel filling device according to 1. 3. The gas fuel according to claim 1, further comprising an oil on-off valve for opening and closing the oil return passage, wherein the oil on-off valve is closed when the compressor stops operating. Lubrication device in the filling device.