JP2022054560A - Electromagnetic valve, and gas fuel filling supply system provided with the electromagnetic valve - Google Patents

Abstract

To effectively suppress generation of vibrations when an electromagnetic valve flows fluid in an OFF state.SOLUTION: An electromagnetic valve includes: a valve body; a housing which includes a first flowing passage, a chamber, a second flowing passage, and a valve seat and shields the first flowing passage and the chamber by the valve body being seated on the valve seat; an energizing member normally energizing the valve body to the valve seat; a solenoid part which includes an electromagnetic coil 47, a fixed iron core, and a movable iron core and, when the electromagnetic coil 47 is conducted, the movable iron core is attracted to the fixed iron core side and pull the valve body away from the valve seat; and a control circuit part 100 including a switch 110 that can selectively switch an ON state connecting the electromagnetic coil 47 and the power source V and an OFF state that a closed circuit is formed by the electromagnetic coil 47 and a resistor 120.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to a solenoid valve and a gas fuel filling and supplying system provided with the solenoid valve, and particularly to a technique suitable for filling and supplying fuel for a gas engine.

Conventionally, vehicles equipped with a gas engine that uses compressed natural gas (hereinafter referred to as CNG) as fuel have been put into practical use. A fuel filling and supplying system for this type of gas engine is disclosed in, for example, Patent Document 1.

Japanese Patent No. 3407445

The fuel filling and supplying system includes a fuel tank for storing CNG. The fuel tank is connected to a filling pipe for circulating CNG from a filling port into which a nozzle is inserted at the time of fuel filling, and a supply pipe for circulating CNG when supplying CNG to the engine. The downstream side of the filling pipe and the upstream side of the supply pipe merge with each other and are connected to the fuel tank as a single pipe (hereinafter referred to as a branch pipe).

By the way, the branch pipe may be provided with a solenoid valve as a main stop valve which is turned on when the engine is driven and turned off when the engine is stopped or when fuel is filled. During fuel filling, the CNG pushes open the valve body of the solenoid valve and passes through it, so that vibration is generated in the solenoid valve, and there is a problem that the vibration affects noise, durability of the pipe, and the like.

The technique of the present disclosure has been made in view of the above circumstances, and an object thereof is to effectively suppress the generation of vibration when the fluid is circulated in the OFF state of the solenoid valve.

The solenoid valve of the present disclosure is provided between the valve body, the first flow passage, the chamber communicating with the first flow passage, the second flow passage communicating with the chamber, and between the first flow passage and the chamber. A housing in which the first flow passage and the chamber are blocked by the valve seat seated on the valve seat, and the valve body is constantly urged toward the valve seat. The urging member includes an electromagnetic coil, a fixed iron core provided in the electromagnetic coil, and a movable iron core provided integrally with the valve body so as to be integrally movable. When the electromagnetic coil is energized, the movable iron core is fixed. A solenoid portion that is attracted to the iron core side to separate the valve body from the valve seat, a first state in which the electromagnetic coil and the power supply are connected, and a second state in which the electromagnetic coil and a resistor form a closed circuit. It is characterized by including a control circuit unit including a switch that can be selectively switched.

The system of the present disclosure is a gas fuel filling and supply system provided with the solenoid valve, and has a tank for storing gas fuel, a filling pipe provided with a filling port for the gas fuel at the upstream end, and an upstream end thereof. The supply pipe connected to the downstream end of the filling pipe and connected to the injector facing the intake passage of the gas engine on the downstream side thereof, and branched from the connection portion between the filling pipe and the supply pipe. The solenoid valve is provided with a branch pipe connected to the tank, and the solenoid valve has the housing so that the first flow passage is on the connection portion side and the second flow passage is on the tank side. The control circuit unit is interposed in the branch pipe, and is in the first state while the gas engine is being driven. When the gas engine is stopped, the gas fuel is filled into the tank from the filling port. At the time of filling, the second state is set.

According to the technique of the present disclosure, it is possible to effectively suppress the generation of vibration when the fluid is circulated in the OFF state of the solenoid valve.

It is a schematic overall block diagram which shows the engine which concerns on this embodiment, and a gas fuel filling supply system. It is a schematic sectional drawing which shows the solenoid valve which concerns on this embodiment. It is a schematic diagram which shows the control apparatus which concerns on this embodiment, and the related peripheral configurations.

Hereinafter, the solenoid valve according to the present embodiment and the gas fuel filling / supply system provided with the solenoid valve will be described with reference to the accompanying drawings. The same parts are designated by the same reference numerals, and their names and functions are also the same. Therefore, detailed explanations about them will not be repeated.

[overall structure]
FIG. 1 is a schematic overall configuration diagram showing an engine 10 and a gas fuel filling / supply system 30 according to the present embodiment.

As shown in FIG. 1, the vehicle 1 is equipped with an engine 10 as a driving force source. The engine 10 is a gas engine that uses gas as fuel, and in the present embodiment, it is configured as a CNG engine that uses CNG as fuel.

The engine 10 mainly has a cylinder head 11 and an engine main body including a cylinder block 12. The cylinder block 12 is provided with a cylinder C for accommodating the piston P so as to be reciprocally movable. A crankshaft 15 is connected to the piston P via a connecting rod 13, a crank arm 14, and the like, and the reciprocating motion of the piston P is converted into a rotary motion and transmitted to the crankshaft 15. For the sake of illustration, FIG. 1 shows only one of the plurality of cylinders of the engine 10, and the other cylinders are not shown. The engine 10 may be either a plurality of cylinders or a single cylinder.

The cylinder head 11 is provided with an intake port 11A for introducing intake air into the cylinder C and an exhaust port 11B for leading out exhaust gas from the inside of the cylinder C. Further, the cylinder head 11 is provided with an intake valve 16 and an exhaust valve 17 that are opened and closed by a valve operating mechanism (not shown). Further, the cylinder head 11 is provided with a spark plug 18 for igniting the CNG supplied to the combustion chamber of the cylinder C.

An intake manifold 20 communicating with the intake port 11A is provided on the side portion of the cylinder head 11 on the intake side. An intake passage 21 for introducing intake air is connected to the intake manifold 20. The intake passage 21 is provided with an air cleaner 22 for removing foreign matter, an injector 37 for injecting CNG, and the like in order from the upstream side of the intake air. In the figure, reference numeral 25 indicates an exhaust manifold that collects exhaust gas, and reference numeral 26 indicates an exhaust passage that leads out exhaust gas from the exhaust manifold 25.

The gas fuel filling / supply system 30 includes a fuel tank 31 for storing CNG, a filling pipe 32 for filling CNG, a supply pipe 33 for supplying CNG, a branch pipe 34, and the like.

At the upstream end of the filling pipe 32, a substantially cylindrical filling port 35 into which the fuel nozzle 70 is inserted when filling the CNG is provided. The downstream end of the filling pipe 32 joins the upstream end of the supply pipe 33. The downstream end of the supply pipe 33 is connected to the fuel gallery 36, and CNG is distributed and supplied to the injectors 37 of each cylinder via the fuel gallery 36.

The branch pipe 34 branches from the connection portion between the filling pipe 32 and the supply pipe 33 and is connected to the fuel tank 31. The branch pipe 34 is provided with a manual valve 50 and a solenoid valve 40 as a main stop valve. The solenoid valve 40 is a normally closed solenoid valve, and opens when a current is passed through an electromagnetic coil (not shown) in response to a command from the control device 100. The solenoid valve 40 is opened (ON) while the engine 10 is being driven, and the CNG is circulated from the fuel tank 31 to the supply pipe 33. Further, the solenoid valve 40 is closed (OFF) while the engine 10 is stopped to prevent the CNG from leaking from the fuel tank 31. The detailed configuration of the solenoid valve 40 will be described later.

The filling pipe 32 is provided with a check valve 51 for preventing CNG from flowing back from the fuel tank 31 to the filling port 35. The supply pipe 33 is provided with a regulator 52 for reducing the pressure or adjusting the pressure of the high-pressure CNG supplied from the fuel tank 31.

[solenoid valve]
FIG. 2 is a schematic cross-sectional view showing the solenoid valve 40 according to the present embodiment.

As shown in FIG. 2, the solenoid valve 40 has a valve portion 40A and a solenoid portion 40B. The valve portion 40A includes a housing 41 interposed in the branch pipe 34 (see FIG. 1). The housing 41 is provided with a first flow passage 42A communicating with the filling port 35 side, a second flow passage 42B communicating with the fuel tank 31 side, and a chamber 42C communicating with the respective flow passages 42A and 42B. .. The valve body 43 is housed in the chamber 42C so as to be movable in the axial direction.

The second flow passage 42B is connected to the chamber 42C from a direction substantially orthogonal to the axial direction of the valve body 43. The first flow passage 42A is connected to the chamber 42C from the axial direction of the valve body 43. A valve seat 44 for seating the valve body 43 is provided between the first flow passage 42A and the chamber 42C. The chamber 42C is provided with a spring 45 (a urging member) that constantly urges the valve body 43 toward the valve seat 44 and seats the valve body 43 on the valve seat 44.

The solenoid portion 40B has a bottomed cylindrical case 46 attached to the housing 41. An electromagnetic coil 47 is housed in the case 46, and a fixed iron core (plug nut) 48 and a movable iron core (plunger) 49 are provided in the electromagnetic coil 47. The fixed iron core 48 is fixed in the electromagnetic coil 47 so as not to be movable in the axial direction. The movable iron core 49 is provided so as to be coaxial with the fixed iron core 48 and movable in the axial direction. The rod 43A of the valve body 43 is fixed to the movable iron core 49 so as to be integrally movable. The material of the fixed iron core 48 and the movable iron core 49 is not limited to iron, and magnetic materials other than iron can be widely used.

The solenoid valve 40 is supplied with a current to the solenoid coil 47 while the engine 10 is being driven. When the electromagnetic coil 47 is energized, the fixed core 48 is magnetized by a magnetic force, and the movable core 49 is attracted to the fixed core 48 side by the magnetic force, so that the valve body 43 resists the urging force of the spring 45 and the valve seat 44. Separate from. When the valve body 43 is separated from the valve seat 44, the solenoid valve 40 is in an open state in which CNG is circulated in the direction of arrow A from the second flow passage 42B toward the first flow passage 42A.

On the other hand, the solenoid valve 40 cuts off the supply of current to the solenoid coil 47 while the engine 10 is stopped. When the electromagnetic coil 47 is de-energized, the valve body 43 is pressed against the valve seat 44 by the urging force of the spring 45, so that the solenoid valve 40 is directed by the arrow A from the second flow passage 42B to the first flow passage 42A. The valve is closed to block the distribution of CNG.

Further, the solenoid valve 40 is also closed when the CNG fuel tank 31 is filled. At this time, the CNG in the direction of the arrow B filled from the first flow passage 42A side pushes the valve body 43 open and flows to the second flow passage 42B. At this time, since the CNG pushes the valve body 43 against the urging force of the spring 45, the valve body 43 may vibrate in the axial direction (vertical direction in the figure) depending on the flow velocity, pressure, specific gravity, etc. of the fluid. be. The solenoid valve 40 of the present embodiment has a function of suppressing the occurrence of such vibration. The details of the function will be described below.

[Control device]
FIG. 3 is a schematic diagram showing a control device 100 (control circuit unit) according to the present embodiment and related peripheral configurations.

As shown in FIG. 3, the control device 100 has a terminal 105 to which one end (for example, a positive terminal) of the electromagnetic coil 47 of the solenoid valve 40 to be driven is connected, and the other end (for example, a negative terminal) of the electromagnetic coil 47. ) Is connected to the terminal 107, a changeover switch 110, a resistor 120, a drive control circuit 140, and a microcomputer (hereinafter referred to as a microcomputer) 150.

The changeover switch 110 has a first terminal 111 connected to the terminal 105 by a line L1, a second terminal 112, and a third terminal 113. The first terminal 111 is configured to selectively switch conduction with the second terminal 112 or the third terminal 113. The second terminal 112 is connected to the vehicle-mounted battery V (power source of the present disclosure) via the power supply line LV, and the third terminal 113 is connected to one end of the resistor 120 via the line L2.

The other end of the resistor 120 is connected to the terminal 107 via the line L3. Further, a ground line LG is connected to the line L3. The ground line LG is a line having a reference potential (= 0V).

The drive control circuit 140 is, for example, an IC and controls the changeover switch 110. The microcomputer 150 includes a CPU, a ROM, a RAM, and the like. An ON / OFF signal indicating drive / stop of the engine 10 is input to the microcomputer 150 from the engine switch 91.
When the engine switch 91 is turned on, the drive control circuit 140 controls the changeover switch 110 to an ON state (first state of the present disclosure) in which the first terminal 111 and the second terminal 112 are connected. When the changeover switch 110 is turned on, the solenoid coil 47 is energized by the electric power supplied from the vehicle-mounted battery V, and the valve body 43 (see FIG. 2) moves to the valve opening position, so that the solenoid valve 40 becomes. The valve is opened to distribute CNG.

On the other hand, when the engine switch 91 is turned off, the drive control circuit 140 controls the changeover switch 110 to an OFF state (second state of the present disclosure) in which the first terminal 111 and the third terminal 113 are connected. .. When the changeover switch 110 is turned off, the solenoid coil 47 is de-energized and the valve body 43 (see FIG. 2) moves to the valve closed position, so that the solenoid valve 40 is closed.

At this time, the solenoid coil 47 of the solenoid valve 40 forms a closed circuit by the line L1, the line L2, the resistance 120, and the line L3. When CNG is filled in this state, a counter electromotive force due to an electric action is generated in the electromagnetic coil 47 as the valve body 43 (see FIG. 2) is pushed open. By generating such a counter electromotive force, the vibration of the valve body 43 at the time of CNG filling can be suppressed, and the generation of noise due to the vibration of the valve body 43 and the decrease in durability are effectively performed. It is possible to prevent it.

[others]
It should be noted that the present disclosure is not limited to the above-described embodiment, and can be appropriately modified and implemented without departing from the spirit of the present disclosure.

For example, in the above embodiment, the solenoid valve 40 has been described as being applied to the filling and feeding system of CNG, but it can also be applied to the filling and feeding system of other fluids (including liquid and gas). Further, the application of the present disclosure is not limited to the gas engine mounted on the vehicle 1, and can be widely applied to the gas engine of an industrial machine such as a generator.

10 Engine 21 Intake passage 30 Gas fuel filling and supply system 31 Fuel tank (tank)
32 Filling pipe 33 Supply pipe 34 Branch pipe 35 Filling port 37 Injector 40 Solenoid valve 40A Valve part 40B Solenoid part 41 Housing 42A 1st flow passage 42B 2nd flow passage 42C Chamber 43 Valve body 44 Valve seat 45 Spring Element)
46 Case 47 Electromagnetic coil 48 Fixed core 49 Movable core 100 Control device (control circuit section)
110 changeover switch (switch)
120 Resistance 140 Drive control circuit 150 Microcomputer V In-vehicle battery (power supply)

Claims (2)

With the valve body,
The valve body includes a first flow passage, a chamber communicating with the first flow passage, a second flow passage communicating with the chamber, and a valve seat provided between the first flow passage and the chamber. A housing in which the first flow passage and the chamber are blocked by sitting on the valve seat.
An urging member that constantly urges the valve body toward the valve seat, and
It includes an electromagnetic coil, a fixed iron core provided in the electromagnetic coil, and a movable iron core provided integrally with the valve body so as to be integrally movable. When the electromagnetic coil is energized, the movable iron core is attracted to the fixed core side. And a solenoid part that separates the valve body from the valve seat,
It is characterized by including a control circuit unit including a switch that can selectively switch between a first state for connecting the electromagnetic coil and a power supply and a second state for forming a closed circuit with the electromagnetic coil and a resistor. Solenoid valve. The gas fuel filling and supplying system provided with the solenoid valve according to claim 1.
A tank for storing gas fuel and
A filling pipe provided with a gas fuel filling port at the upstream end,
The upstream end is connected to the downstream end of the filling pipe, and the downstream side thereof is connected to the injector facing the intake passage of the gas engine.
It is provided with a branch pipe that branches from the connection portion between the filling pipe and the supply pipe and is connected to the tank.
The solenoid valve has a housing interposed in the branch pipe so that the first flow passage is on the connection portion side and the second flow passage is on the tank side.
The control circuit unit is in the first state while the gas engine is being driven, and is in the second state when the gas engine is stopped and when the gas fuel is filled into the tank from the filling port. A gas fuel filling and supply system characterized by being.

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