JP4160975B2 - High temperature fluid injection valve and high temperature water injection internal combustion engine equipped with the same - Google Patents

Description

  The present invention is applied to a water injection type internal combustion engine or the like, which introduces a high temperature fluid containing high temperature water pressurized to a predetermined pressure to a needle valve chamber of a high temperature fluid injection valve and is driven by a needle valve opening / closing means. A high-temperature fluid injection valve configured to control injection of high-temperature fluid from the nozzle hole by opening and closing a flow path between the needle valve chamber and the nozzle hole by attaching and detaching the seat portion and the valve seat; The present invention relates to a high temperature water injection internal combustion engine provided with this high temperature fluid injection valve.

Various water-injection internal combustion engines have been proposed in which fuel and water are injected into a cylinder of an engine to lower the combustion temperature and reduce the amount of NOx generated. In the water-injection internal combustion engine, water is injected into the cylinder. The water injection valve for injecting fuel is the most important factor for maintaining high engine performance as well as reducing NOx generation.
As one of water injection type internal combustion engines that meet such requirements, the present inventors have proposed a high temperature water injection internal combustion engine that generates high temperature water as shown in FIG. 4 and injects it into a cylinder from an injection valve. It was done.

That is, FIG. 4 is a configuration diagram showing a schematic overall configuration of a power generation apparatus provided with a high-temperature water injection internal combustion engine. In FIG. Generator. 102 is a supercharger, 103 is an air cooler, 106 is an exhaust branch pipe of each cylinder, 104 is an exhaust collecting pipe, and 114 is an exhaust pipe at the outlet of the supercharger 102.
Reference numeral 110 denotes a high temperature side heat exchanger, 111 denotes a low temperature side heat exchanger, and 113 denotes a water supply system including a water pump, a water tank, and the like.

In such a power generator equipped with a high-temperature water injection internal combustion engine, the exhaust gas from the engine 100 enters the exhaust collecting pipe 104 from the exhaust branch pipe 106 of each cylinder, and the high temperature side heat exchanger 110 provided in the exhaust collecting pipe 104. After exchanging heat with water, which will be described later, the turbine of the supercharger 102 is driven, and heat exchange with water, which will be described later, is performed in the low temperature side heat exchanger 111 provided in the exhaust pipe 114. It is discharged outside.
On the other hand, the water introduced into the low temperature side heat exchanger 111 from the water supply system 113 undergoes heat exchange with the exhaust gas at the outlet of the supercharger 102 in the low temperature side heat exchanger 111, and is subjected to primary heating. Heat exchange is performed with the high-temperature exhaust gas introduced into the high-temperature side heat exchanger 110 and flowing through the exhaust collecting pipe 104 to be subjected to secondary heating to become high-temperature water at 450 ° C. or higher.
This high-temperature water passes through the high-temperature water pipe 112 and flows from the water injection valve (not shown) to the engine 100.
Is injected at a predetermined timing with respect to fuel injection from a fuel injection valve (not shown).
The high-temperature water injection internal combustion engine is also applied to a marine propulsion device that drives a propeller 302 via a propeller shaft 301 instead of the generator 101, as shown in FIG. .

  Further, in the invention of Patent Document 1 (Japanese Patent Application Laid-Open No. 2003-3924) relating to the application of the present applicant, the fuel pressurized to a predetermined pressure is guided to the needle valve chamber and driven by the needle valve opening / closing means, and the nozzle The fuel injection from the injection hole is controlled by opening and closing the flow path between the needle valve chamber and the injection hole by attaching and detaching the seat part of the needle valve that reciprocally slides on the inner periphery of the tip and the valve seat. In the fuel injection valve configured as described above, the needle valve opening and closing means is configured such that the opening degree of the pilot valve that opens and closes the hydraulic oil passage between the hydraulic oil chamber and the hydraulic oil tank is magnetized by a magnetostrictive material arranged in a magnetic field. The needle valve is closed by opening the hydraulic oil passage by the pilot valve by closing the hydraulic oil passage by the open / close valve and closing the needle valve by seating the seat portion of the needle valve on the valve seat. Separate the needle seat and the valve seat Constitute a super magnetostrictive actuator to the valve, to allow a minute displacement control of the needle valve lift, it is configured to exhibit a high-precision fuel injection performance.

Japanese Patent Laid-Open No. 2003-3924

  In the high-temperature water injection internal combustion engine as shown in FIG. 4, the low-temperature side heat exchanger 111 and the high-temperature side heat exchanger 110 are heated in two stages by exhaust gas, and have a high temperature and high pressure of about 450 ° C. and 35 MPa. By injecting high-temperature water into the cylinder of the engine 100 from the high-temperature fluid injection valve at a predetermined timing with respect to the fuel injection from the fuel injection valve, the NOx generation amount of the engine 100 is reduced and the exhaust gas is exhausted. By recovering the gas with high-temperature water, it is possible to increase engine output and improve thermal efficiency.

  The fuel injection valve in the above-mentioned patent document 1 relating to the application of the present applicant makes it possible to control a minute displacement of the needle valve lift by using a giant magnetostrictive actuator and a pilot valve as needle valve opening and closing means, and highly accurate fuel injection. Although configured so as to exhibit performance, when a fuel injection valve for a high-temperature water injection internal combustion engine as shown in FIG. 4 is applied, the injection fluid is at a high temperature of about 450 ° C. and is highly corrosive. Since it is water, such an injection valve that operates with fuel close to room temperature has the following problems to be solved.

  That is, the fuel injection valve as shown in Patent Document 1 is provided with a giant magnetostrictive actuator and a pilot valve as needle valve opening / closing means, and is compact as a structure in which the giant magnetostrictive actuator and the pilot valve are incorporated in the injection valve body. When the fuel injection valve is applied to a high-temperature fluid injection valve for a high-temperature water-injection internal combustion engine as shown in FIG. 4, the high-temperature water is a needle valve in a needle valve case. Since the flow around the needle valve including the inside of the hole and the internal passage of the nozzle tip, the temperature around the needle valve case and the temperature of the needle valve and the nozzle tip is significantly higher than that of a normal fuel injection valve.

  For this reason, in such a high-temperature fluid injection valve, the temperature of the giant magnetostrictive actuator and the pilot valve incorporated in the upper part of the injection valve body becomes high due to heat transfer from the periphery of the needle valve case and from the nozzle tip. Due to the overheating accompanying such a high temperature, the operation of the giant magnetostrictive actuator and the pilot valve is likely to cause an error, thereby causing a malfunction, resulting in a decrease in injection performance. Further, the durability of the giant magnetostrictive actuator is lowered by such high temperature.

  In view of the problems of the prior art, the present invention provides a needle valve opening / closing means for controlling the opening / closing of a needle valve, particularly a giant magnetostrictive actuator and an opening / closing valve (pilot valve), even if the jet fluid is a high-temperature fluid such as high-temperature water. There is provided a high-temperature fluid injection valve with improved durability and such a high-temperature fluid injection valve as well as preventing the occurrence of deterioration of the injection performance of the injection valve due to such overheating by avoiding overheating of the needle valve opening / closing means that constitutes Another object of the present invention is to provide a high temperature water injection internal combustion engine.

  The present invention achieves such an object, and guides a high-temperature fluid pressurized to a predetermined pressure to a needle valve chamber, and is driven by a needle valve opening / closing means attached to the injection valve body so as to be reciprocally slidable in the needle valve hole. By opening and closing the flow path between the needle valve chamber and the nozzle hole formed at the tip of the nozzle chip by attaching and detaching the seat part of the needle valve fitted to the valve seat and the valve seat, A high-temperature fluid injection valve configured to control injection of a high-temperature fluid between a mounting portion of the needle valve opening / closing means of the injection valve body and a case member in which the needle valve chamber is formed Further, a spacer made of a low thermal conductive material including a ceramic material is interposed (claim 1).

  In this invention, specifically, the needle valve opening / closing means includes a magnetostrictive material arranged in a magnetic field with an opening degree of an opening / closing valve for opening / closing a hydraulic oil passage between the hydraulic oil chamber and the hydraulic oil tank. The opening and closing valve closes the hydraulic oil passage, the seat portion of the needle valve is seated on the valve seat, the needle valve is closed, and the hydraulic oil passage is opened by the opening and closing valve. A magnetostrictive actuator that opens a needle valve by separating a seat portion and a valve seat, the magnetostrictive actuator and the on-off valve are installed in the injection valve main body, and the spacer is formed on a lower surface of the injection valve main body. It is preferable to configure so as to be interposed between the upper surface of the case member.

According to such an invention, the gap made of the low thermal conductivity material including the ceramic material is provided between the mounting portion of the needle valve opening / closing means of the injection valve body in the high-temperature fluid injection valve and the case member in which the needle valve chamber is formed. Since the spacer is interposed, the heat conduction from the periphery of the needle valve case and the nozzle tip where the high-temperature jet fluid including high-temperature water flows and is in a high-temperature state is blocked by the spacer.
Due to the heat insulating action of the spacer, the temperature in the vicinity of the mounting portion of the needle valve opening / closing means decreases, and the needle valve opening / closing means, particularly the magnetostrictive actuator whose operating performance is likely to deteriorate at high temperatures, and the opening / closing valve Overheating can be avoided, the occurrence of a drop in the injection performance of the high-temperature fluid injection valve associated with such overheating can be prevented, and the durability of the high-temperature fluid injection valve can be improved.

Further, in this invention, preferably, a cooling fluid passage is provided which communicates from the lower part in the injection valve body to the interior of the spacer and through which the cooling liquid for cooling the lower part of the injection valve body and the spacer flows. At the same time, a coolant passage inside the spacer is formed on the side close to the nozzle tip.
With this configuration, by forcibly cooling the lower part and the spacer in the injection valve main body, the heat shut-off function in the vicinity of the spacer mounting portion is further improved, and the needle valve opening / closing means, particularly at high temperatures. It is possible to reduce the temperature of the magnetostrictive actuator, whose operating performance tends to decrease, and to improve the injection performance and durability of the high-temperature fluid injection valve associated with the temperature decrease.
Further, since the coolant passage inside the spacer is formed on the side close to the nozzle tip, the temperature on the side close to the nozzle tip on the heat input side of the spacer can be lowered, The heat shielding function of the liquid passage is increased, and heat from the nozzle tip side can be suppressed from being transmitted to the magnetostrictive actuator side, so that the temperature of the magnetostrictive actuator can be further lowered.

Further, the present invention provides a high-temperature fluid injection valve having the above-described features, a needle valve driven by needle valve opening / closing means for guiding high-temperature water pressurized to a predetermined pressure to the needle valve chamber of the high-temperature fluid injection valve. A high-temperature water injection internal combustion engine configured to control the injection of high-temperature water from the nozzle hole by opening and closing a flow path between the needle valve chamber and the nozzle hole by attaching and detaching the seat portion and the valve seat (Claims 4, 5, and 6) are used to provide a high-temperature fluid injection valve having injection performance and durability adapted to the use of high-temperature water.
The present invention can be applied to a high-temperature fluid injection valve that injects a high-temperature fluid in a wide range of pressure from a low pressure to a high pressure of 35 MPa or more, and a high-temperature water injection internal combustion engine equipped with the high-temperature fluid injection valve.

  According to the present invention, a spacer made of a low thermal conductivity material is interposed between the mounting portion of the needle valve opening / closing means of the injection valve body in the high-temperature fluid injection valve and the case member in which the needle valve chamber is formed. Because of this, the spacers block the heat conduction from the periphery of the needle valve case and the nozzle tip where the high-temperature jet fluid including high-temperature water flows and is in a high-temperature state. The temperature in the vicinity of the mounting portion of the needle valve opening / closing means decreases due to the heat insulating action of the needle valve, and overheating of the needle valve opening / closing means, particularly the magnetostrictive actuator and the opening / closing valve can be avoided, and the injection performance of the high temperature fluid injection valve accompanying such overheating Can be prevented, and the durability of the high-temperature fluid injection valve can be improved.

  Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this example are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Only.

FIG. 1 is a longitudinal sectional view of a water injection valve including a magnetostrictive actuator of a high temperature water injection internal combustion engine according to an embodiment of the present invention. 2A is a configuration diagram showing a magnetostrictive actuator and a hydraulic fluid system in the water injection valve shown in FIG. 1, and FIG. 2B is a cross-sectional view taken along line AA in FIG. 3A is an enlarged cross-sectional view of a Y portion in FIG. 1, and FIG. 3B is a view taken along the line BB in FIG.
1 to 3, reference numeral 200 denotes a water injection valve, 1 denotes an injection valve body of the injection valve 200, 3 denotes a nozzle tip made of a heat resistant steel material having heat resistance and corrosion resistance, and 4 denotes a plurality of nozzle tips at the tip of the nozzle tip 3. A perforated nozzle hole 6 is a sack portion communicating with the nozzle hole 4.
Reference numeral 031 is a needle valve case, and 5 is a needle valve. As shown in FIG. 1, the needle valve 5 has a fitting diameter portion 5y fitted in a needle valve hole 1z drilled in the needle valve case 031 so as to be slidable back and forth. Are combined. In the needle valve case 031, the needle valve 5 reciprocally slides in the needle valve hole 1 z and, as will be described later, high-temperature and high-pressure water of about 450 ° C. and 35 MPa flows in the needle valve chamber 5 b. Therefore, it is made of heat-resistant steel material with heat resistance and corrosion resistance. 5z is the center of the needle valve.
A conical seat portion 5 a is formed at the tip of the needle valve 5, and the seat portion 5 a is attached to and detached from a valve seat 3 a formed on the upper end surface side of the nozzle chip 3. The sack portion 6 and the nozzle hole 4 are communicated and blocked.

Reference numeral 40 denotes a nozzle nut. By screwing the nozzle nut 40 into the lower portion of the needle valve case 031 (a screw portion is not shown), the lower surface of the needle valve case 031 and the upper surface of the nozzle tip 3 are fluid-tightly contacted. It touches.
5b is a needle valve chamber formed with the outer peripheral surface of the needle valve 5 facing, 7 is an inlet for the injection fluid (high temperature water in this embodiment) to the needle valve chamber 5b, and 7a is an inlet connector. High-temperature jet fluid from the inlet pipe 112 (see FIG. 2) is introduced into the needle valve chamber 5b through the jet fluid inlet 7.
27 is a hydraulic oil inlet, and 12 is a hydraulic oil chamber in which hydraulic oil introduced from the hydraulic oil inlet 27 is accommodated. Reference numeral 9 denotes a connecting member that transmits hydraulic oil pressure in the hydraulic oil chamber 12 to the needle valve 5.
30 is a giant magnetostrictive actuator, 31 is a pilot valve that is actuated by the giant magnetostrictive actuator 30, and details will be described later.

In FIGS. 1 and 3, reference numeral 8 denotes a spacer interposed between the lower surface of the injection valve body 1 and the upper surface of the needle valve case 031. Reference numeral 10 denotes a main body side tightening nut, and the main body side tightening nut 10 is screwed into a lower threaded portion 10 a of the injection valve main body 1, whereby the spacer 8 is attached to the upper surface of the needle valve case 031 and the injection valve main body 1. It is fluid-tightly sandwiched between the lower surface.
The spacer 8 is made of a low heat conductive material such as a ceramic material or a heat-resistant steel material having a low thermal conductivity, and the spacer 8 can block heat from the needle valve case 031 side.

Inside the spacer 8, there are a coolant inlet passage 21 a and a coolant outlet passage 21 b in the axial direction communicating with a coolant inlet passage 21 a 1 and a coolant outlet passage 21 b 1 drilled in the lower part of the injection valve body 1, respectively. Perforated. The coolant inlet passage 21a and the coolant outlet passage 21b in the spacer 8 are communicated with each other by an annular groove 320 formed in an annular shape on the lower surface of the spacer 8, that is, on the side close to the nozzle tip 3, as shown in FIG. ing.
In FIG. 3B, reference numeral 33 denotes a knock pin for positioning between the spacer 8 and the injection valve body 1.

The coolant inlet passage 21a1 and the coolant outlet passage 21b1 in the injection valve body 1 are connected to the coolant inlet 20 and the coolant outlet (not shown) as shown in FIG.
As a result, the cooling oil introduced from the coolant inlet 20 is changed into the coolant inlet passage 21a1 in the injection valve body 1 → the coolant inlet passage 21a of the spacer 8 → the annular groove 320 of the spacer 8 → the coolant outlet of the spacer 8. It flows like passage 21b → coolant outlet passage 21b1 in injection valve body 1 → coolant outlet, and cools the lower portion of spacer 8 and injection valve body 1.
With this configuration, by forcibly cooling the lower part of the injection valve main body 1 and the spacer 8, the heat shut-off function in the vicinity of the spacer 8 mounting portion is improved, and the operating performance is reduced at high temperatures. The temperature drop of the giant magnetostrictive actuator 30 that is easy to perform and the improvement in the injection performance and durability of the water injection valve 200 associated with the temperature drop can be realized.
Further, since the coolant passage such as the annular groove 320 in the spacer 8 is formed on the side close to the nozzle tip 3, the temperature on the side close to the nozzle tip 3 which is the heat input side of the spacer 8 is set. The heat shield function of the annular groove 320 is increased, and heat from the nozzle tip 3 side can be suppressed from being transmitted to the giant magnetostrictive actuator 30 side, thereby further reducing the temperature of the giant magnetostrictive actuator. it can.

In FIG. 2A, 123 is a hydraulic oil pump, 125 is a hydraulic oil tank, 124 is a hydraulic oil pipe, and the hydraulic oil in the hydraulic oil tank 125 is operated through the hydraulic oil pipe 124 and the hydraulic oil inlet 27 by the hydraulic oil pump 123. The oil is introduced into the oil inlet chamber 27a.
The hydraulic oil chamber 12 is formed with the hydraulic oil inlet chamber 27a and the partition wall 111 therebetween, and the end surface 9a of the connecting member 9 faces the hydraulic oil chamber 12a.
2A and 2B, a control notch 5c is formed on the outer peripheral surface of the connecting member 9 over a certain length, and the shaft of the needle valve 5 and the connecting member 9 is formed. By moving in the direction, the hydraulic oil inlet chamber 27a and the hydraulic oil chamber 12 can communicate with each other via the control cutout 5c.

  31 is a pilot valve which opens and closes a hydraulic oil passage 121 which is formed on the upper side of the injection valve main body 1 and connects the hydraulic oil chamber 12 and the oil discharge passage 125a to the hydraulic oil tank 125. That is, the pilot valve 31 opens and closes the hydraulic oil passage 121 by attaching and detaching a flat contact surface to the valve seat surface 5f on the injection valve main body 1 side.

Reference numeral 30 denotes a giant magnetostrictive actuator, which is configured as follows.
33 is a magnet (electromagnet), 32 is a giant magnetostrictive material that is displaced by magnetostriction, and is temporarily fixed to the support portion at the base of the pilot valve 31. The giant magnetostrictive material 32 is axially moved by energization of the magnet 33. The pilot valve 31 is reciprocated by displacing the valve. Reference numeral 34 denotes a spring interposed between the support portion 31a of the pilot valve 31 and the main body portion 35 of the actuator, and is biased in the direction in which the pilot valve 31 is closed.
The basic configuration itself of the giant magnetostrictive actuator 30 is known, and in this embodiment, the pilot valve 31 is connected to the giant magnetostrictive actuator 30 and is driven to open and close.

During operation of the high-temperature water injection internal combustion engine having such a configuration, when the needle valve 5 is closed, the pilot valve 31 is closed by the giant magnetostrictive actuator 30, and the hydraulic oil pressure in the hydraulic oil chamber 12 is changed to the connection. It acts on the upper surface 9 a of the member 9.
Then, when a current is applied to the magnet 33 of the giant magnetostrictive actuator 30 to displace the giant magnetostrictive material 32 and the pilot valve 31 connected thereto is lifted to open the hydraulic fluid passage 121, The hydraulic oil is discharged to the hydraulic oil tank 125 side through the oil discharge passage 125a, and the force by the hydraulic oil in the hydraulic oil chamber 12 acting on the needle valve 5 and the force by the jet fluid in the needle valve chamber 5b are balanced. The needle valve 5 is settled at the position where the needle valve 5 is opened, and the needle valve 5 is opened, and high-temperature water in the needle valve chamber 5b is injected from the nozzle hole 4 into the cylinder through the sack portion 6.

According to this embodiment, the low thermal conductivity containing the ceramic material is provided between the mounting portion of the giant magnetostrictive actuator 30 and the pilot valve 31 of the injection valve body 1 and the needle valve case 031 in which the needle valve chamber 5b is formed. Since the spacer 8 made of the material is interposed, the heat conduction from the periphery of the needle valve case 031 where the high-temperature jet fluid made of high-temperature water flows and is in a high-temperature state and from the nozzle tip 3 is the spacer. 8 is blocked.
The temperature of the vicinity of the mounting portion of the giant magnetostrictive actuator 30 and the pilot valve 31 is lowered by the heat insulating action of the spacer 8 as described above, and overheating of the giant magnetostrictive actuator 30 and the pilot valve 31 is likely to deteriorate the operation performance at a high temperature. Thus, the deterioration of the injection performance of the water injection valve 200 accompanying such overheating can be prevented, and the durability of the water injection valve 200 can be improved.

  In the above embodiment, the high-temperature fluid injection valve according to the present invention is applied to a high-temperature water-injection type internal combustion engine for a power generator, but the present invention is applied to a propeller shaft as shown in FIG. The present invention can also be applied to a high-temperature water injection type internal combustion engine for a marine propulsion device that drives a propeller 302 via 301.

  According to the present invention, even if the jet fluid is a high-temperature fluid such as high-temperature water, the needle valve opening / closing means for controlling the opening / closing of the needle valve, in particular, the needle valve opening / closing constituted by the giant magnetostrictive actuator and the opening / closing valve (pilot valve). A high temperature fluid injection valve with improved durability and a high temperature water injection internal combustion engine equipped with such a high temperature fluid injection valve while preventing the occurrence of deterioration in the injection performance of the injection valve accompanying such overheating by avoiding overheating of the means Can provide institutions.

It is a longitudinal cross-sectional view of the water injection valve containing the magnetostriction actuator of the high temperature water injection internal combustion engine which concerns on the Example of this invention. (A) is a block diagram which shows the magnetostriction actuator and hydraulic fluid system in the water injection valve shown in FIG. 1, (B) is the sectional view on the AA line in (A). (A) is the Y section expanded sectional view in FIG. 1, (B) is the BB arrow line view in (A). 1 is a configuration diagram illustrating a schematic overall configuration of a power generation device including a high-temperature water injection internal combustion engine to which the present invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Injection valve main body 1z Needle valve hole 3 Nozzle tip 3a Valve seat 4 Injection hole 5 Needle valve 5a Needle valve seat part 5b Needle valve chamber 5y Fitting diameter part 6 Suck part 7 Injection fluid inlet 8 Spacer 9 Connecting member 10 Main body side Clamping nut 12 Hydraulic oil chamber 20 Coolant inlet 21a Coolant inlet passage 21b Coolant outlet passage 30 Super magnetostrictive actuator 31 Pilot valve 031 Needle valve case 320 Annular groove 40 Nozzle nut 200 Water injection valve

Claims (6)

  A high-temperature fluid pressurized to a predetermined pressure is guided to a needle valve chamber, driven by a needle valve opening / closing means mounted on the injection valve body, and fitted in a needle valve hole so as to be slidable back and forth, By opening and closing the flow path between the needle valve chamber and the nozzle hole formed at the tip of the nozzle tip by attaching and detaching to the valve seat, the injection of the high-temperature fluid from the nozzle hole is controlled. The high-temperature fluid injection valve is made of a low heat conductive material including a ceramic material between a mounting portion of the needle valve opening / closing means of the injection valve main body and a case member in which the needle valve chamber is formed. A high-temperature fluid injection valve characterized by interposing a spacer.   The needle valve opening / closing means changes the opening degree of the opening / closing valve for opening / closing the hydraulic oil passage between the hydraulic oil chamber and the hydraulic oil tank by the magnetic distortion of the magnetostrictive material arranged in the magnetic field, and By closing the hydraulic oil passage, the seat portion of the needle valve is seated on the valve seat, the needle valve is closed, and by opening the hydraulic oil passage by the on-off valve, the seat portion of the needle valve and the valve seat are connected. It comprises a magnetostrictive actuator that opens the needle valve at a distance, the magnetostrictive actuator and the on-off valve are installed in the injection valve body, and the spacer is disposed between the lower surface of the injection valve body and the upper surface of the case member. The high-temperature fluid injection valve according to claim 1, wherein the high-temperature fluid injection valve is interposed therebetween.   The lower part of the injection valve main body communicates with the interior of the spacer, and the lower part of the injection valve main body and the coolant passage for cooling the spacer flow are provided. 3. The high-temperature fluid injection valve according to claim 1, wherein a coolant passage is formed on a side close to the nozzle tip.   High-temperature water pressurized to a predetermined pressure is guided to the needle valve chamber of the high-temperature fluid injection valve, and the needle valve chamber and the injection hole are separated by attaching / detaching the seat portion of the needle valve driven by the needle valve opening / closing means and the valve seat. A high-temperature water injection internal combustion engine configured to control injection of high-temperature water from the nozzle holes by opening and closing a flow passage between the high-temperature fluid injection valve and the needle valve of the injection valve body A high-temperature water injection internal combustion engine characterized in that a spacer made of a low heat conductive material including a ceramic material is interposed between a mounting portion of the opening / closing means and a case member in which the needle valve chamber is formed.   The needle valve opening / closing means of the high-temperature fluid injection valve changes the opening degree of the opening / closing valve for opening / closing the hydraulic oil passage between the hydraulic oil chamber and the hydraulic oil tank by the magnetostriction of the magnetostrictive material arranged in the magnetic field. Closing the hydraulic oil passage by the on-off valve, causing the seat portion of the needle valve to be seated on the valve seat, closing the needle valve, and opening the hydraulic oil passage by the on-off valve, A magnetostrictive actuator that opens the needle valve by separating the valve seat and the valve seat, the magnetostrictive actuator and the on-off valve are installed in the injection valve body, and the spacer is disposed on the lower surface of the injection valve body and the case The high-temperature water injection internal combustion engine according to claim 4, wherein the high-temperature water injection internal combustion engine is interposed between the upper surface of the member. The high-temperature fluid injection valve communicates with the interior of the spacer from a lower portion in the injection valve body, and has a coolant passage through which a coolant for cooling the lower portion of the injection valve body and the spacer flows. 6. The high-temperature water injection internal combustion engine according to claim 4, wherein a coolant passage inside the spacer is formed on a side close to the nozzle tip .

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