JP2007247418A - Liquid injector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid injector capable of changing an injection shape and an injection quantity with a simple structure. <P>SOLUTION: Quantity of gas flowing in a plunger chamber 22 is increased by a flow control valve 7. Liquid much in a gas dissolved quantity is forcibly sent to a nozzle 3 by operating a plunger pump 2, and thereby, friction between a wall surface and the liquid is reduced by microbubbles generated on a wall surface of a first flow passage 41. Thus, a rate of crushing a vortex of a swirl flow is reduced, to become injection large in an injection angle like an injection angle 9B and weak in penetrating force. While, when forcibly sending the liquid little in the gas dissolved quantity to the nozzle 3 by reducing the quantity of gas flowing in the plunger chamber 22 by closing the flow control valve 7, the friction between the wall surface and the liquid of the first flow passage 41 is not reduced and the rate of crushing the vortex of the swirl flow is not reduced, to become injection narrow in the injection angle like an injection angle 9A and strong in the penetrating force. Thus, the injection shape and the injection quantity of the liquid can be easily changed by changing the gas dissolved quantity in the liquid. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a liquid ejecting apparatus capable of changing a liquid ejecting shape and an ejecting amount.

Conventionally, for example, Patent Document 1 discloses a liquid injection device (hereinafter also referred to as an injector) that injects fuel oil as a liquid into a combustion chamber of a direct injection engine.
This is a fuel injection hole that has an injection hole facing in the direction of the spark plug and an injection hole that faces in the other direction as an injection hole for fuel injected from the injector, and is injected according to the operating state of the engine. By changing the oil pressure, the shape of the injection is changed to obtain an optimal combustion state.
JP 2005-98118 A

  However, in such a conventional apparatus, in general, the structure for changing the pressure of the fuel oil to change the injection shape of the fuel oil becomes complicated, leading to a problem of increasing costs and lowering reliability. was there.

  In view of the above problems, an object of the present invention is to provide a liquid ejecting apparatus capable of changing the ejection shape and the ejection amount with a simple structure.

It has been said that the velocity of the liquid flowing in the flow channel becomes zero near the channel wall surface pole.
However, Dreck. C. According to Tretheway's experiment, when the material of the flow path is not wetted by the liquid, and the liquid that has not been degassed is passed through the flow path, the speed of the liquid near the flow path wall is not zero, and the speed is Confirmed to have.
This phenomenon does not occur when the channel wall surface is wetted by the liquid, and does not occur even if the liquid is degassed.
He says that this phenomenon is due to nanoscale micro-bubbles generated near the channel wall. (Reference, “Simulation of fluid slip at 3D hydrophobic microchannels by the lattice Boltzmnn method” Journal of Computational Physics 2021 (2005) 2021).
His experiment was conducted on a liquid flowing in a minute flow path, but the present invention applies this phenomenon to the injection of liquid, and the injection shape and injection amount of the liquid injected from the liquid injection device Is controlled by the amount of dissolved gas in the liquid.
That is, according to the present invention, the amount of dissolved gas in the liquid is set between the nozzle that ejects the liquid that is made of a material in which the wall of the flow path through which the liquid flows is not wetted with the liquid, and the pump that pumps the liquid to the nozzle. Either a gas dissolved amount control means that can increase or decrease, or a low vapor pressure liquid control means that can increase or decrease a liquid having a low vapor pressure in the liquid is provided.

  According to the present invention, the amount of dissolved gas in the liquid is increased, and the wall surface of the flow path in the nozzle is made of a material that does not get wet with the liquid. A velocity boundary layer is formed in the vicinity of the wall surface of the nozzle flow path. In the velocity boundary layer, a large shear force is generated due to the difference in the flow velocity of the liquid, and a kind of vacuum boiling (cavitation) occurs due to the shear force, and nanoscale micro bubbles are generated. For this reason, the velocity of the liquid is not zero but has a certain size in the vicinity of the wall surface of the flow path (a state called “Slip Flow”), and the flow velocity, flow rate, and pressure loss in the nozzle change, so the injection shape And the injection amount changes. That is, by changing the amount of dissolved gas in the liquid, it is possible to change the injection shape and the injection amount of the liquid. Moreover, even if a part of the liquid is changed to a liquid having a low vapor pressure, the same effect as when the dissolved gas amount is increased can be expected.

Next, embodiments of the present invention will be described by way of examples.
First, the first embodiment will be described.
FIG. 1 shows the overall configuration of the liquid ejecting apparatus according to the first embodiment.
The liquid ejecting apparatus 1 includes a plunger pump 2 for pumping liquid, a liquid tank 6 for storing liquid, a nozzle 3 serving as a liquid ejection hole, pipes 5a, 5b, and 5c, and a flow rate control valve 7. .
The plunger pump 2 includes a pump housing 21 including check valves 4a, 4b, and 4c, and a plunger 20 that is disposed in the pump housing 21 and forms a plunger chamber 22 between the pump housing 21. The
The plunger 20 reciprocates in the pump housing 21 in the vertical direction in FIG. 1, and the volume of the plunger chamber 22 changes as the plunger 20 reciprocates.

One end sides of the pipes 5a to 5c are connected to the plunger chamber 22 of the pump housing 21 via check valves 4a to 4c, respectively.
The other end side of the pipe 5 a is opened to the air, the other end side of the pipe 5 b is connected to the liquid tank 6, and the other end side of the pipe 5 c is connected to the nozzle 3.
The check valve 4a only allows gas to be sucked into the plunger chamber 22 from the pipe 5a, and prevents liquid or gas from flowing out to the outside.
The check valve 4b only allows the liquid to be sucked from the liquid tank 6 into the plunger chamber 22, and prevents the liquid from flowing backward.
The check valve 4c only allows discharge from the plunger chamber 22 to the nozzle 3 side, and prevents the liquid from flowing backward.

The flow rate control valve 7 controls the amount of gas flowing into the plunger chamber 22 through the pipe 5a.
The nozzle 3 includes a nozzle member 32 having a flow path 40 through which a liquid passes and a nozzle housing 31 surrounding the nozzle member 32.
The nozzle member 32 is made of a material that does not wet the liquid flowing in the flow path 40 (for example, Teflon (registered trademark) when the liquid is water or gasoline).
In FIG. 1, the flow path 40 of the nozzle member 32 is illustrated as one hole penetrating the nozzle member 32, but the detailed structure of the actual flow path 40 will be described later.

When the plunger 20 moves downward in FIG. 1, gas and liquid flow into the plunger chamber 22 through the pipes 5a and 5b by the action of the check valves 4a to 4c, respectively.
When the plunger 20 moves upward in FIG. 1, the liquid in the plunger chamber 22 is pumped to the nozzle 3 through the pipe 5 c by the action of the check valves 4 a to 4 c, and the liquid is ejected from the nozzle 3.
In FIG. 1, when the plunger 20 moves upward, the liquid is pressurized and simultaneously pressurized in a state where the liquid and the gas coexist in the plunger chamber 22, and the gas is dissolved in the liquid, and the dissolved amount of gas in the liquid Will increase.

When the liquid whose gas dissolved amount is increased by the operation of the plunger pump 2 is pumped to the nozzle 3, the wall surface of the flow path 40 of the nozzle 3 is made of a material that does not wet the liquid. Nano-scale microbubbles are generated, and pressure loss caused by friction between the wall surface of the flow path 40 and the liquid is reduced.
As a result, the speed and flow rate of the liquid ejected through the flow path 40 provided in the nozzle member 32 are increased.
By controlling the amount of gas flowing into the plunger chamber 22 by the flow rate control valve 7 attached to the pipe 5a, the speed and flow rate of the liquid ejected from the nozzle 3 can be changed.

Next, the detailed structure of the nozzle 3 will be described.
2A is a view of the nozzle member 32 as viewed from the liquid ejection side end portion, and FIG. 2B is a view showing a cross section taken along the line AA in FIG. 2A. .
In FIG. 2B, the liquid is ejected downward.
The flow path 40 formed in the nozzle member 32 has four third flow paths 43 whose one end side is connected to the pipe 5c and whose other end extends to the vicinity of the end of the liquid ejection side, and the liquid ejection side of the nozzle member 32 The first flow path 41 that opens at the end of the first flow path, and the four second flow paths 42 that connect the third flow path 43 and the first flow path 41.
Further, the first flow path 41 and the second flow path 42 are arranged so that the second flow path 42 is point-symmetric about the first flow path 41.
The second flow path 42 is connected eccentrically with respect to the axis of the first flow path 41 as shown in FIG.
In the present embodiment, four second flow paths 42 are formed. However, it is not always necessary to form a plurality of the second flow paths 42, and one or more may be used.
Moreover, although the example which has arrange | positioned the 2nd flow path 42 and the 3rd flow path 43 point-symmetrically with respect to the axial center of the 1st flow path 41 was shown, it does not necessarily need to be point-symmetric.

As shown in FIG. 2, since the second flow path 42 is connected eccentrically with respect to the first flow path 41 of the nozzle member 32, the first flow from the third flow path 43 through the second flow path 42. The liquid that has flowed into the channel 41 generates a flow generally called a swirl flow, and flows in the first flow path 41 while winding a spiral vortex (see FIG. 3).
This spiral vortex is weakened by friction between the wall surface of the first flow path 41 and the liquid.
When the vortex is strong, the jet angle of the jetted liquid becomes large, and the jet angle of the liquid becomes small as the vortex is weakened.

Therefore, when the amount of gas sucked into the plunger chamber 22 by the flow rate control valve 7 is increased and a liquid with a large amount of dissolved gas is pumped to the nozzle 3, the wall surface is caused by microbubbles generated on the wall surface of the first flow path 41. Since the friction between the liquid and the liquid is reduced, the rate at which the swirl vortex is crushed is reduced, and an injection having a large injection angle and a low penetrating force can be realized as in the injection angle 9B shown in FIG.
On the other hand, when the amount of gas flowing into the plunger chamber 22 is reduced by closing the flow control valve 7 and a liquid with a small amount of dissolved gas is pumped to the nozzle 3, the friction between the wall of the first flow path 41 and the liquid is reduced. Since it is not reduced and the rate at which the swirl vortex is crushed is not reduced, the injection angle is narrow and the injection with a strong penetration force can be realized as shown by the injection angle 9A.
In this embodiment, the plunger pump 2 and the flow rate control valve 7 constitute gas dissolved amount control means in the present invention.

In this embodiment, the nozzle member 32 is made of a material that is not wetted by the liquid, and the amount of dissolved gas of the liquid supplied to the nozzle 3 is increased. Compared with the case where minute bubbles are generated and no bubbles are generated in the vicinity of the wall surface of the flow path 40, the injection shape and the injection amount are changed.
That is, by opening the flow control valve 7 and increasing the amount of gas sucked into the plunger chamber 22 to increase the amount of dissolved gas in the liquid, the speed and flow rate of the liquid injected through the flow path 40 are increased. In addition to increasing, it is possible to realize injection with a large injection angle and weak penetrating force.
On the other hand, by closing the flow control valve 7 and reducing the amount of gas sucked into the plunger chamber 22 to reduce the amount of dissolved gas in the liquid, the speed and flow rate of the liquid injected through the flow path 40 can be reduced. While decreasing, it is possible to realize injection with a small injection angle and a strong penetrating force.
Further, since it is only necessary to provide the flow rate control valve 7 for controlling the amount of gas flowing into the plunger chamber 22 in order to change the liquid injection shape and the injection amount, the structure of the liquid injection device 1 is simplified and manufactured. Cost and the like can be reduced.

  Simultaneously with the pumping of the liquid by the plunger pump 2, it is not necessary to provide two devices, ie, a device for pumping the liquid and a device for dissolving the gas in the liquid, by dissolving the gas in the liquid. The manufacturing cost and man-hour of the apparatus 1 can be reduced.

In this embodiment, the plunger pump 2 is used as a pump for pumping liquid, but the present invention is not limited to this, and other types of pumps may be used.
Further, in the liquid ejecting apparatus 1 shown in FIG. 1, the pump for pumping the liquid and the apparatus for increasing the dissolved amount of gas in the liquid are the same (the plunger pump 2 allows the pumping of liquid and the dissolved amount of gas in the liquid. However, they are not necessarily the same, and may be separate devices.

Next, a second embodiment will be described.
In the first embodiment, the control of the speed and flow rate of the liquid ejected from the nozzle is controlled by the dissolved amount of gas in the liquid. In the second embodiment, a sub-liquid that reacts with the main liquid is mixed. As a result of the reaction, by generating a liquid having a low vapor pressure, the speed and flow rate of the liquid ejected from the nozzle are controlled.
FIG. 4 shows the overall configuration of the liquid ejecting apparatus according to the second embodiment.
In addition, the same number is attached | subjected about the same structure as a 1st Example, and description is abbreviate | omitted.
A main liquid tank 11 in which the main liquid is stored and a sub liquid tank 12 in which the sub liquid is stored are connected to the plunger pump 2A via pipes 5e and 5d, respectively.

The pipe 5d on the side to which the sub liquid tank 12 is connected is provided with a flow control valve 7A, and the amount of sub liquid flowing from the sub liquid tank 12 into the plunger chamber 22 can be controlled by opening and closing the flow control valve 7A. it can.
The pipes 5d and 5e are connected to the plunger chamber 22 via check valves 4d and 4e, respectively, and prevent the liquid from flowing back from the plunger chamber 22 to the sub liquid tank 12 and the main liquid tank 11.
The liquid ejecting apparatus 1A is configured by the plunger pump 2A, the nozzle 3, the pipes 5c to 5e, the flow control valve 7A, the main liquid tank 11, and the sub liquid tank 12.
When the main liquid and the sub liquid are mixed, the liquid mixture is changed to a liquid mixture having a low vapor pressure.

When the plunger 20 moves downward in FIG. 4, the main liquid and the sub liquid are sucked into the plunger chamber 22 from the main liquid tank 11 and the sub liquid tank 12.
The main liquid and the sub liquid are mixed in the plunger chamber 22, and the mixed liquid including the liquid having a low vapor pressure generated by the mixing is pumped to the liquid jet nozzle by pressurization by the plunger.
Since a liquid having a low vapor pressure is included, nanoscale microbubbles are likely to be generated on the wall surface of the flow path 40 of the nozzle member 32 as in the first embodiment. As a result, the same effect as when the amount of dissolved gas in the liquid is increased (in the case of the first embodiment) is obtained, and the speed and flow rate of the liquid ejected from the nozzle 3 are increased.
Therefore, by opening and closing the flow control valve 7A and changing the mixing amount of the sub liquid, the injection shape and the injection amount of the liquid injected from the nozzle 3 can be changed as in the first embodiment.
In this embodiment, the plunger pump 2A and the flow rate control valve 7A constitute the low vapor pressure liquid control means in the present invention.

The present embodiment is configured as described above, and by increasing the amount of the sub-liquid mixed, the liquid ejected from the nozzle 3 increases in speed and flow rate, and at the injection angle 9B as in the first embodiment. As shown, the injection angle is wide and the penetration force is weak.
On the other hand, by closing the flow rate control valve 7A, the amount of the sub-liquid mixed is reduced, so that the speed and flow rate of the liquid ejected from the nozzle 3 decreases, and the injection angle narrows and penetrates as shown by the injection angle 9A. It will be strong.
In the present embodiment, the main liquid and the sub liquid are mixed in the plunger chamber 22. However, the present invention is not limited to the plunger chamber 22, and the upstream side of the plunger pump 2 </ b> A or the plunger pump 2 </ b> A and the nozzle 3. Can also be mixed.
The pump to be used is not limited to the plunger pump, and the liquid may be pumped by other pumps.

Next, a third embodiment will be described.
In the second embodiment, a sub-liquid that reacts with the main liquid is used to generate a liquid having a low vapor pressure, thereby increasing the speed and flow rate of the liquid ejected from the nozzle. In the third embodiment, the sub-liquid is increased. The effect similar to Example 2 is acquired by using the catalyst which accelerates | stimulates the decomposition reaction of a main liquid, without using a liquid.
FIG. 5 shows the overall configuration of the liquid ejecting apparatus according to the third embodiment.
In the liquid ejecting apparatus 1B in the present embodiment, the nozzle 3 in the liquid ejecting apparatus 1 in the first embodiment is changed to the nozzle 3A, and only the liquid from the liquid tank 6 flows into the plunger chamber 22 of the plunger pump 2B. It is what I did.
The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.
The liquid tank 6 is connected to the plunger pump 2B via the pipe 5b, and the liquid in the liquid tank 6 can flow into the plunger chamber 22 of the plunger pump 2B.
The liquid pumped by the plunger pump 2B is supplied to the nozzle 3A through the pipe 5c.

The nozzle 3A includes a nozzle member 32A in which a flow path 40A through which liquid passes is formed, a catalyst 33 supported on the upstream side (the pipe 5c side) of the liquid flow on the wall surface of the flow path 40A of the nozzle member 32A, and a nozzle member The heater 34 encloses 32A and the nozzle housing 31A that covers the outer periphery of the heater 34.
The flow path 40A formed in the nozzle member 32A has the same configuration as the flow path 40 formed in the nozzle member 32 in the first embodiment.
The liquid supplied from the pipe 5c is injected through the flow path 40A provided in the catalyst 33 and the nozzle member 32A.
The catalyst 33 promotes the decomposition reaction of the liquid passing through the flow path 40A.
Further, the catalyst 33 may be provided by being carried on the front surface of the inner wall of the flow path 40A formed in the nozzle member 32A.

The catalyst 33 has an activation temperature, and the liquid is not decomposed when the catalyst 33 does not reach the activation temperature.
Accordingly, by heating the catalyst 33 to the activation temperature by the heater 34 installed in the immediate vicinity of the catalyst 33, the decomposition of the liquid passing through the flow path 40A is promoted.
The liquid promoted to decompose by the catalyst 33 changes to a liquid or gas having a low vapor pressure, and nanoscale microbubbles are likely to be generated on the channel wall surface of the nozzle member 32A as in the second embodiment. This has the effect of increasing the speed and flow rate of the liquid ejected from 3A.
In this embodiment, the catalyst 33 and the heater 34 constitute a low vapor pressure liquid control means in the present invention.

This embodiment is configured as described above, and the flow of the nozzle 3A is changed according to the same principle as in the second embodiment by heating the catalyst 33 by the heater 34 and changing the liquid to a liquid or gas having a low vapor pressure. The speed and flow rate of the liquid passing through the path 40A can be changed, and the injection shape and the injection amount of the liquid injected from the nozzle 3A can be changed.
Since the amount of change of the liquid by the catalyst 33 can be controlled by the temperature of the catalyst, the gas dissolved amount of the liquid can be controlled by changing the energization amount to the heater 34.

  In this embodiment, the catalyst 33 is installed on the inner wall of the flow path of the nozzle member 32A. However, it is not always necessary to install the catalyst 33 on the inner wall of the nozzle member 32A. For example, you may install in the wall surface of the piping 5c which connects the plunger pump 2B and the nozzle 3A.

The liquid injection devices 1, 1A, 1B described in the first to third embodiments can be used as injectors for injecting fuel oil into the combustion chamber of a spark ignition direct injection engine.
FIG. 6 shows the overall configuration of the spark ignition direct injection engine.
The spark ignition direct injection engine 50 includes an injector 10 composed of a liquid injection device 1, 1 </ b> A or 1 </ b> B that injects fuel oil into the combustion chamber 13, an intake valve 14 that sends air into the combustion chamber 13, and a gas in the combustion chamber 13. An exhaust valve 15 that discharges gas, a spark plug 16 that performs spark ignition on the gas in the combustion chamber 13, and a piston 17 that moves by the explosive force in the combustion chamber 13 are provided.
A cavity 18 is provided on the surface of the piston 17 on the combustion chamber 13 side.

The spark ignition direct injection engine 50 further includes an air flow meter, a throttle opening sensor, a crank angle sensor, a cooling water temperature sensor, and the like (not shown). The signals of the spark ignition direct injection engine 50 are input from these sensors. A control unit (C / U) 19 for determining the operating state is provided.
The control unit 19 receives signals output from various sensors, determines the operating state of the spark ignition direct injection engine 50, and outputs a fuel oil injection amount and an injection angle suitable for the operation state to the injector 10. .

In the spark ignition direct injection engine 50, when the output of the engine may be small, fuel oil is injected from the injector 10 and the injected fuel is applied to the cavity 18 during the compression process by the piston 17.
The fuel oil that hits the cavity 18 moves along the depression, and as a result, the fuel oil concentrates around the spark plug 16.
Thereafter, a voltage is applied to the spark plug 16, a spark is blown, fuel oil is ignited, and the piston 17 is pushed down. Such combustion is called stratified combustion.
On the other hand, when it is desired to increase the engine output, fuel is injected during the intake process.
The injected fuel oil is homogeneously mixed with the intake air and is ignited by the spark plug 16 after the compression process. Such combustion is called homogeneous combustion.

The fuel oil injection suitable for the stratified combustion is an injection having a narrow injection angle and penetrating power.
When the control unit 19 determines that the operating state of the spark ignition direct injection engine 50 is stratified combustion, the gas dissolved in the liquid (fuel oil) is dissolved by the method described in the first to third embodiments. Do not increase the volume or produce a liquid with low vapor pressure.
As a result, the injection angle of the fuel oil injected from the injector 10 is narrow and the penetration force is strong, and injection suitable for stratified combustion is realized.

On the other hand, fuel oil injection suitable for homogeneous combustion is an injection with a wide injection angle and a low penetration force.
When the control unit 19 determines that the operating state of the spark ignition direct injection engine 50 is homogeneous combustion, the gas in the liquid (fuel oil) is obtained by the method described in the first to third embodiments. Increases dissolved amount or produces liquid with low vapor pressure.
As a result, the injection angle of the fuel oil injected from the injector 10 is wide, the penetration force is weak, and injection suitable for homogeneous combustion that is easy to mix with the intake air is realized.

Further, when the spark ignition direct injection engine 50 is in an operation state in which the spark ignition type direct injection engine 50 is not sufficiently warm, for example, at the time of cold start, injection of fuel oil having a low penetration force and easy to mix with the sucked air is required.
Therefore, for example, when the control unit 19 determines from the signal from the coolant temperature sensor that the operation state of the spark ignition direct injection engine 50 is a cold start, the method described in the first to third embodiments. Thus, it is possible to realize the injection of the fuel oil having a wide injection angle by increasing the dissolved gas amount in the fuel oil or generating a liquid having a low vapor pressure.
In addition, although the example which used the liquid-injection apparatus 1, 1A, 1B in the 1st-3rd Example as the injector 10 of the spark ignition direct injection engine 50 was shown here, the problem of a cold start etc. is a port, for example. Since the same problem occurs in other internal combustion engines, the injector 10 may be applied to other internal combustion engines.

  The liquid ejected from the liquid ejecting apparatuses 1, 1 </ b> A, 1 </ b> B is not limited to this.

It is a figure which shows the liquid ejecting apparatus in a 1st Example. It is a figure which shows the detailed structure of a nozzle. It is a figure which shows the flow of a liquid. It is a figure which shows the liquid ejecting apparatus in 2nd Example. It is a figure which shows the liquid ejecting apparatus in a 3rd Example. It is a figure which shows the example which applied the liquid-injection apparatus to the spark ignition direct injection engine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A, 1B Liquid injection apparatus 2, 2A, 2B Plunger pump 3, 3A Nozzle 4a-4e Check valve 5a-5e Piping 6 Liquid tank 7, 7A Flow control valve 10 Injector 11 Main liquid tank 12 Sub liquid tank 13 Combustion Chamber 16 Spark plug 17 Piston 18 Cavity 19 Control unit 20 Plunger 21 Pump housing 22 Plunger chamber 31, 31A Nozzle housing 32, 32A Nozzle member 33 Catalyst 34 Heater 40, 40A Channel 41 First channel 42 Second channel 43 3rd flow path 50 Spark ignition direct injection engine

Claims (10)

In a liquid ejecting apparatus including a nozzle that ejects liquid and a pump that pumps the liquid to the nozzle,
Either a gas dissolved amount control means for increasing or decreasing a gas dissolved amount in the liquid, or a low vapor pressure liquid control means for increasing or decreasing a liquid having a low vapor pressure in the liquid,
The liquid ejecting apparatus according to claim 1, wherein a wall surface of a flow path in which the liquid flows in the nozzle is made of a material that does not wet the liquid. 2. The liquid ejecting apparatus according to claim 1, wherein the dissolved gas amount control means pressurizes the gas and the liquid in a mixed state. A flow control valve for controlling the flow rate of the gas sucked by the pump;
3. The liquid ejecting apparatus according to claim 2, wherein the dissolved gas amount control unit pressurizes the gas whose flow rate is controlled by the flow rate control valve together with the liquid in the pump. The liquid ejecting apparatus according to claim 1, wherein the low vapor pressure liquid control unit changes a part of the liquid into a liquid having a low vapor pressure. The liquid ejecting apparatus according to claim 4, wherein the low vapor pressure liquid control unit generates a liquid having a low vapor pressure by mixing a sub-liquid that reacts with the liquid. The liquid ejecting apparatus according to claim 4, wherein the low vapor pressure liquid control unit includes a catalyst that changes the liquid to a liquid having a low vapor pressure. The liquid ejecting apparatus according to claim 6, wherein the catalyst is provided on a wall surface of a flow path through which the liquid flows in the nozzle. The liquid ejecting apparatus according to claim 6, further comprising a heater that heats the catalyst in the vicinity of the catalyst. The flow path through which the liquid flows in the nozzle includes at least a first flow path that is closest to the liquid ejection side, and a second flow path that supplies the liquid to the first flow path.
The liquid ejecting apparatus according to claim 1, wherein the second flow path is connected eccentrically with respect to an axis of the first flow path. In an internal combustion engine that generates kinetic energy by combustion of liquid fuel supplied into a combustion chamber,
The liquid ejecting apparatus according to any one of claims 1 to 9, wherein the liquid fuel is supplied to the combustion chamber.
Control the dissolved gas amount control means or the low vapor pressure liquid control means of the liquid ejecting apparatus, increase or decrease the dissolved gas amount in the liquid according to the combustion state in the combustion chamber, or vapor pressure in the liquid An internal combustion engine comprising: a control unit that increases or decreases a low liquid.

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