CN212429059U - Supercharged fluid injection device and internal combustion engine - Google Patents

Abstract

The utility model belongs to the technical field of fluid jet, a booster-type fluid jet device and internal-combustion engine are disclosed. The booster-type fluid injection device comprises a shell, a valve element, a plunger and a reset structure, wherein an installation cavity is formed in the shell, the valve element, the plunger and the reset structure are arranged in the installation cavity, and the shell is provided with a servo oil channel and a fuel oil channel; the plunger internal oil passage is respectively communicated with the fuel oil passage and the valve element internal oil passage, and high-pressure servo oil entering from the servo oil passage can push the plunger to extrude the fuel oil entering from the fuel oil passage into an oil containing groove of the valve element; the valve element is used for realizing injection in the fuel pressurization process; the reset structure is used for ensuring that the fluid injection device can realize continuous operation. The utility model discloses compact structure, the pressure boost is efficient, can realize the nimble control to injection pressure and oil spout speed under the different work condition, reduces the equipment loss, increase of service life.

Description

Supercharged fluid injection device and internal combustion engine

Technical Field

The utility model relates to an internal-combustion engine technical field especially relates to a booster-type fluid injection apparatus and internal-combustion engine.

Background

The fluid injection technology is mainly applied to occasions where various liquid fuels are injected at high pressure, such as internal combustion engines, the conventional fluid injection system mostly adopts a piezoelectric brake or an electric control signal to control and connect mechanical parts to carry out extremely quick axial reciprocating motion, so as to achieve the purpose of pressurizing and injecting the fluid, however, the fluid injection device under the matching of an electric control element and the mechanical parts has a complex structure due to necessary oil-electricity isolation, and under the electric control system, because of the restriction of a pressurizing piston, the fuel oil pressurization ratio is relatively fixed, so that the flexible control of the oil injection pressure and the oil injection rate under different working conditions is difficult to ensure.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a structure is comparatively compact, can adjust the booster-type fluid injection device and the internal-combustion engine of fluid jet rate and frequency in a flexible way.

In order to achieve the above object, the utility model provides a following technical scheme:

a pressurized fluid ejection device, comprising:

the fuel injection device comprises a shell, a fuel injection valve and a fuel injection valve, wherein the shell is provided with an installation cavity, one end of the shell is provided with a servo oil channel and a fuel oil channel, and the other end of the shell is provided with a nozzle;

the valve element is arranged in the mounting cavity and comprises a needle valve with a first oil channel and a needle valve seat with a second oil channel, the second oil channel is communicated with the nozzle, an oil containing groove is formed between the needle valve and the needle valve seat, the needle valve can move between a first position and a second position relative to the needle valve seat, when the needle valve is located at the first position, the oil containing groove is only communicated with the first oil channel, and when the needle valve is not located at the first position, the oil containing groove is simultaneously communicated with the first oil channel and the second oil channel;

the plunger is arranged in the mounting cavity in a sliding manner, a third oil duct is arranged in the plunger, one end of the plunger is communicated with the servo oil channel, the other end of the plunger is inserted in the first oil duct in a sliding manner, one end of the third oil duct is communicated with the fuel oil channel, and the other end of the third oil duct is communicated with the first oil duct;

the resetting structure is arranged in the mounting cavity and is configured to always provide elastic force for the needle valve to move to the first position.

Preferably, the needle valve further comprises a limiting sleeve which is fixedly arranged in the shell, the needle valve is arranged in the limiting sleeve in a penetrating mode, a stop protrusion is arranged on the inner side of the limiting sleeve, a protrusion is arranged on the needle valve, the protrusion is opposite to the stop protrusion and close to the needle valve seat, and when the needle valve is located at the second position, the protrusion abuts against the stop protrusion.

Preferably, the reset structure includes an elastic member, an upper seat body and a lower seat body, the upper seat body is disposed in the mounting cavity, the lower seat body abuts against the needle valve, the lower seat body can slide relative to the upper seat body, the elastic member is sleeved on the plunger and abuts against between the upper seat body and the lower seat body, and the plunger penetrates through the upper seat body and the lower seat body and is inserted into the first oil duct.

Preferably, a first limiting step is arranged in the shell, and the upper base body abuts between the first limiting step and the limiting sleeve.

Preferably, a second limiting step is arranged on the plunger, and when the needle valve is located at the second position, the second limiting step abuts against the lower seat body.

Preferably, the housing includes an upper housing and a tightening cap, the upper housing and the tightening cap are connected to form the mounting cavity, a third limiting step is disposed on an inner side of the tightening cap, and the upper housing is configured to press the limiting sleeve against the third limiting step.

Preferably, one end of the needle valve extends into the second oil duct, a boss is arranged at the end of the needle valve, an oil through hole communicated with the first oil duct and the oil containing groove is formed in the boss, and when the needle valve is located at the first position, the boss can block the second oil duct.

Preferably, the plunger is provided with an annular oil passage communicated with the third oil passage, and the annular oil passage is communicated with the fuel oil passage all the time so that fuel oil can enter the oil containing groove.

Preferably, the fuel passage is provided with a check valve that is communicated in a direction toward the third oil passage.

Preferably, there is also provided an internal combustion engine comprising a pressurised fluid injection device as claimed in any one of the preceding claims.

The utility model has the advantages that:

the utility model provides a fluid injection apparatus, including casing, valve element, plunger and reset structure etc. have the installation cavity in the casing, valve element, plunger and reset structure all set up in the installation cavity. The casing is provided with a servo oil channel and a fuel oil channel, the introduced high-pressure servo oil can directly push the plunger to move in the casing along the axial direction, the fuel oil entering the needle valve through the fuel oil channel is forced to be pressurized to the oil containing groove, meanwhile, the high-pressure fuel oil can drive the needle valve to leave the oil channel inside the needle valve seat, the fuel oil is further forced to enter the oil channel inside the needle valve seat, and the fuel oil pressurization injection is completed. The utility model discloses inside with the injection apparatus of pressure boost plunger integration, the high-pressure servo oil that the servo oil inlet on through the injection apparatus top was introduced carries out the pressure boost to the fuel of coming from the side direction check valve to high-pressure servo oil is as the main drive power of fuel pressure boost, can realize the nimble control to injection pressure and oil spout speed through the pressure and the frequency that change high-pressure servo oil under the different work condition, promotes the pressure boost efficiency. Meanwhile, the pressurizing plunger piston adopts a middle oil passing mode, the number of parts of the pressurizing fluid injection device and the size of the device are reduced, the pressurizing device and the injection device are integrated into a whole, the transmission distance of high-pressure fuel oil is shortened, the compactness of the equipment structure is ensured, the loss in the process is reduced, the load of the whole system is greatly reduced because the ultrahigh pressure bearing part is only positioned at the terminal of the fuel injection system, the service life of the system is prolonged, and the whole cost is also reduced.

Drawings

Fig. 1 is a first schematic structural diagram (a needle valve is located at a first position) of a pressurized fluid injection apparatus according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a pressurized fluid injection apparatus according to an embodiment of the present invention (a needle valve is located between a first position and a second position);

fig. 3 is a schematic partial structural view of a pressurized fluid injection apparatus according to an embodiment of the present invention (the needle valve is located at the first position).

The reference numbers are as follows:

1-a shell; 101-a servo oil channel; 102-a fuel channel; 103-a first limit step; 104-a first receiving cavity; 105-a second receiving chamber; 11-an upper shell; 12-tightening the cap; 121-a third limiting step;

2-a nozzle;

3-a valve element; 301-oil containing groove; 31-needle valve; 311-a first oil passage; 312-oil through hole; 313-a boss; 314-a bump; 3111-a first containment section; 3112-a second housing section; 32-needle valve seat; 321-a second oil passage;

4-a plunger; 41-a third oil passage; 42-an annular oil gallery; 43-a second limit step;

5-a reset structure; 51-an elastic member; 52-an upper seat body; 53-lower base;

6-a limiting sleeve; 601-upper section limit sleeve; 602-lower section stop collar; 61-stop projection.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts throughout, or parts having the same or similar functions. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly and can include, for example, fixed or removable connections, mechanical or electrical connections, direct connections, indirect connections through an intermediary, communication between two elements, or an interaction between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, unless otherwise expressly specified or limited, the first feature "on" or "under" the second feature may include both the first and second features being in direct contact, and may also include the first and second features being in contact, not in direct contact, but with another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

As shown in fig. 1 to 3, the present invention provides a pressurized-type fluid injection device including a housing 1, a valve element 3, a plunger 4, and a reset structure 5. The shell 1 is provided with an installation cavity, one end of the shell 1 is provided with a servo oil channel 101 and a fuel oil channel 102, the other end of the shell is provided with a nozzle 2, and the valve element 3, the plunger 4 and the reset structure 5 are all arranged in the installation cavity; the valve element 3 comprises a needle valve 31 provided with a first oil channel 311 and a needle valve seat 32 provided with a second oil channel 321, the second oil channel 321 is communicated with the nozzle 2, an oil containing groove 301 is formed between the needle valve 31 and the needle valve seat 32, the needle valve 31 can move between a first position and a second position relative to the needle valve seat 32, when the needle valve 31 is located at the first position, the oil containing groove 301 is only communicated with the first oil channel 311, and when the needle valve 31 is not located at the first position, the oil containing groove 301 can be simultaneously communicated with the first oil channel 311 and the second oil channel 321; the plunger 4 is arranged in the mounting cavity in a sliding mode, a third oil duct 41 is arranged in the plunger 4, one end of the plunger 4 is communicated with the servo oil channel 101, the other end of the plunger 4 is inserted into the first oil duct 311 in a sliding mode, one end of the third oil duct 41 is communicated with the fuel oil channel 102, and the other end of the third oil duct is communicated with the first oil duct 311; the return structure 5 is configured to always provide the needle valve 31 with an elastic force moving to the first position, thereby ensuring that the injection device can operate continuously. The supercharged fluid jet device is compact in overall structure and high in supercharging efficiency, and can ensure flexible control of oil injection pressure and oil injection speed under different working conditions.

Specifically, as shown in fig. 1, the first oil passage 311 disposed inside the needle valve 31 along the axial direction thereof includes a first accommodating section 3111 and a second accommodating section 3112 that are coaxially and sequentially disposed, and an inner diameter of the first accommodating section 3111 is greater than that of the second accommodating section 3112, the first accommodating section 3111 is located at one end close to the plunger 4, the plunger 4 is inserted into the first accommodating section 3111 in the first oil passage 311, and it is ensured that the plunger 4 slides relatively only in the first accommodating section 3111, when the high-pressure servo oil pushes the plunger 4 to slide in a direction close to the second accommodating section 3112, a lower end of the plunger 4 can compress fuel in the first accommodating section 3111 and move to the oil containing groove 301 through the second accommodating section 3112, oil pressure in the oil containing groove 301 rises, and then the fuel in the oil containing groove 301 pushes the needle valve 31 to move in a direction close to the plunger 4, and the needle valve 31 is pushed to move from the first position to the second position.

It can be understood that when the needle valve 31 is in the first position, the fuel enters the oil containing groove 301 through the fuel passage 102, the third oil passage 41 and the first oil passage 311, and the fuel is fed. When the plunger 4 presses the fuel in the oil containing groove 301 under the action of the high-pressure servo oil to enable the needle valve 31 to leave the first position, at this time, the oil containing groove 301 is always communicated with the second oil passage 321, the fuel in the oil containing groove 301 can realize oil injection through the second oil passage 321, further, when the needle valve 31 is located at the first position, the oil containing groove 301 is only communicated with the first oil passage 311, the needle valve 32 is located at any position between the first position and the second position, and when the needle valve 32 is located at the second position, the oil containing groove 301 is simultaneously communicated with the first oil passage 311 and the second oil passage 321.

Further, the plunger 4 is provided with an annular oil passage 42 communicated with the third oil passage 41, a fuel oil passage 102 is arranged on the side wall of the housing 1 corresponding to the annular oil passage 42, and the annular oil passage 42 is always communicated with the fuel oil passage 102, so that the fuel oil can enter the oil containing groove 301. Preferably, the inner diameter of the fuel passage 102 is smaller than the height of the annular oil passage 42 to ensure that the fuel passage 102 and the annular oil passage 42 can always be in communication during the movement of the plunger 4.

As shown in fig. 1, the pressurized fluid injection device further includes a limiting sleeve 6 fixedly disposed in the housing 1, the needle valve 31 is disposed in the limiting sleeve 6 in a penetrating manner, a stop protrusion 61 is disposed on an inner side of the limiting sleeve 6, a protrusion 314 is disposed on the needle valve 31, the protrusion 314 is close to the needle valve seat 32 relative to the stop protrusion 61, and when the needle valve 31 is located at the second position, the protrusion 314 abuts against the stop protrusion 61. Preferably, the protrusion 314 and the stop protrusion 61 are both configured as an annular structure, a plurality of coaxial holes with different apertures are provided inside the needle valve seat 32, the protrusion 314 of the needle valve 31 is located between the stop protrusion 61 inside the stop collar 6 and the needle valve seat 32, wherein the outer diameter of the protrusion 314 is larger than the inner diameter of the stop protrusion 61 and the inner diameter of one hole of the needle valve seat 32 close to the stop collar 6, when the needle valve 31 is located at the first position, the protrusion 314 abuts against the needle valve seat 32, when the needle valve 31 is located at the second position, the protrusion 314 abuts against the stop protrusion 61, and the stop collar 6 and the needle valve seat 32 jointly limit the movable range of the needle valve 31 in the axial direction.

As shown in fig. 1, the reset structure 5 includes an elastic element 51, an upper seat 52 and a lower seat 53, the upper seat 52 is disposed in the installation cavity, the lower seat 53 abuts against the needle valve 31, and the lower seat 53 can slide relative to the upper seat 52, the elastic element 51 is sleeved on the plunger 4 and abuts between the upper seat 52 and the lower seat 53, and the plunger 4 passes through the upper seat 52 and the lower seat 53 and is inserted into the first oil passage 311. In the present embodiment, the elastic member 51 is preferably a spring. The upper seat body 52 and the lower seat body 53 are both annular structures having a cavity therein, wherein the inner aperture of the upper seat body 52 is slightly larger than the outer diameter of the lower seat body 53, so that the lower seat body 53 can slide along the inner hole of the upper seat body 52, and when the needle valve 31 moves from the first position to the second position, the lower seat body 53 can be pushed to compress the elastic element 51, and the fixing effect of the upper seat body 52 and the lower seat body 53 on the elastic element 51 is ensured.

Further, a first limit step 103 is arranged in the housing 1, and the upper seat 52 abuts between the first limit step 103 of the housing 1 and the limit sleeve 6. Specifically, the inner cavity of the housing 1 is stepped, and includes a first accommodating cavity 104 and a second accommodating cavity 105, wherein the inner diameter of the first accommodating cavity 104 is smaller than that of the second accommodating cavity 105, the inner diameter change part is a first limiting step 103, and the first limiting step 103 is also annular in the inner cavity of the housing 1. Furthermore, the upper seat 52 is installed in the second accommodating cavity 105 of the housing 1, and the upper end of the upper seat 52 abuts against the first limiting step 103, and the lower end of the lower seat 53 abuts against the limiting sleeve 6, so as to limit the movement of the upper seat 52 in the axial direction.

Meanwhile, due to the fact that the high-pressure servo oil is high in pressure, the plunger 4 is in sliding fit with the valve element 3, and the like, in order to guarantee the effective range of the movement of the plunger 4 and improve the safety of the use of equipment, the lower seat body 53 also has a limiting effect on the plunger 4, the plunger 4 is provided with a second limiting step 43, and when the needle valve 31 is located at the second position, the second limiting step 43 abuts against the lower seat body 53 to limit the sliding of the plunger 4 in the axial direction.

As shown in fig. 3, one end of the needle valve 31 extends into the second oil passage 321, and the end is provided with a boss 313, the boss 313 is provided with an oil through hole 312 communicating the first oil passage 311 and the oil containing groove 301, and when the needle valve 31 is located at the first position, the boss 313 can block the second oil passage 321. Specifically, in the present embodiment, the boss 313 is a tapered boss, the inner wall surface of the second oil passage 321 has a tapered surface matching with the tapered boss, when the needle valve 31 is located at the first position, the tapered boss abuts against the tapered surface to block the second oil passage 321, and at this time, the oil containing groove 301 is only communicated with the first oil passage 311. When the needle valve 31 moves from the first position to the second position, the conical boss is separated from the conical surface, so that the boss 313 loses the blocking effect on the second oil passage 321, the second oil passage 321 is communicated with the oil containing groove 301 and the first oil passage 311, and the fuel in the oil containing groove is sprayed out through the second oil passage 321.

Further, in the present embodiment, a check valve 105 is provided in the fuel passage 102, and the check valve 105 is opened in a direction toward the third oil passage 41 while supplying fuel to the fuel passage 102 in accordance with the operating time of the supercharged fluid injection device. Specifically, when the needle valve 31 is in the first position, the check valve 105 is opened, and the fuel enters the oil reservoir 301 through the fuel passage 102, the third oil passage 41, and the first oil passage 311. When the needle valve 31 moves from the first position to the second position, the check valve 105 closes, and the fuel is stopped from entering.

Optionally, the housing 1 includes an upper housing 11 and a tightening cap 12, the upper housing 11 and the tightening cap 12 are connected to form an installation cavity, a third limiting step 121 is disposed on the inner side of the tightening cap 12, and the upper housing 11 is configured to press the limiting sleeve 6 against the third limiting step 121, so as to fix the limiting sleeve 6. Further, in the present embodiment, the locking cap 12 is screwed to the upper housing 11, so that the installation and maintenance of the device can be greatly facilitated.

In order to further realize the pressurized injection of the fluid, one end of the nozzle 2 is located in the tightening cap 12 and connected with the needle valve seat 32, the other end of the nozzle 2 extends out of the tightening cap 12, the fuel flows into the nozzle 2 through the second oil channel 321 in the needle valve seat 32, preferably, the nozzle 2 is connected with the needle valve seat 32 through threads, and the side surface of the nozzle 2 is provided with a plurality of small holes for further pressurized injection of the fuel.

It should be particularly noted that the utility model provides a supercharged fluid jet apparatus concrete theory of operation as follows:

the fluid pressurization injection device is operated in two steps in total:

firstly, introducing fuel oil. When the needle valve 31 is in the first position, the check valve 105 in the fuel passage 102 is opened, and the fuel enters the oil containing groove 301 after passing through the fuel passage 102, the annular oil passage 42, the third oil passage 41 and the first oil passage 311.

And secondly, introducing high-pressure servo oil. The check valve 105 of the fuel oil passage 102 is closed, the servo oil passage 101 is filled with the servo oil, the servo oil drives the plunger 4 to start moving towards the needle valve 31, the fuel oil in the first oil passage 311 is pressurized, the fuel oil pressure in the oil containing groove 301 is increased, the needle valve 31 is driven by the fuel oil to move towards the direction far away from the nozzle 2, namely, the needle valve moves from the first position to the second position, the oil containing groove 301 is communicated with the second oil passage 321, and the pressurized fuel oil sequentially enters the second oil passage 321 and the nozzle 2 to start injection. In the process, the needle valve 31 pushes the lower seat body 53 to slide relative to the upper seat body 52 to compress the elastic member 51. After the fuel injection is finished or the high-pressure servo oil stops being introduced, the fuel pressure in the oil containing groove 301 is reduced, and the needle valve 31 is driven to return to the first position by the resetting structure 5.

Then, the check valve 105 communicated with the fuel passage 102 is opened, the fuel enters the oil containing groove 301, the plunger 4 is slowly lifted under the action of the fuel to return to the initial position, and then high-pressure servo oil is introduced to reciprocate in sequence.

The embodiment also provides an internal combustion engine, and the internal combustion engine comprises the supercharged fluid injection device, so that the flexible control of fuel supercharged injection can be realized, the supercharging efficiency is improved, the equipment loss is reduced, and the service life is prolonged.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A pressurized fluid ejection device, comprising:

the fuel injection device comprises a shell (1) and a fuel injection nozzle, wherein the shell (1) is provided with an installation cavity, one end of the shell (1) is provided with a servo oil channel (101) and a fuel oil channel (102), and the other end of the shell is provided with the nozzle (2);

the valve element (3) is arranged in the installation cavity, the valve element (3) comprises a needle valve (31) and a needle valve seat (32), the needle valve (31) is provided with a first oil channel (311), the needle valve seat (32) is provided with a second oil channel (321), the second oil channel (321) is communicated with the nozzle (2), a containing oil groove (301) is formed between the needle valve (31) and the needle valve seat (32), the needle valve (31) can move between a first position and a second position relative to the needle valve seat (32), when the needle valve (31) is located at the first position, the containing oil groove (301) is only communicated with the first oil channel (311), and when the needle valve (31) is not located at the first position, the containing oil groove (301) is simultaneously communicated with the first oil channel (311) and the second oil channel (321);

the plunger (4) is arranged in the mounting cavity in a sliding mode, a third oil duct (41) is arranged in the plunger (4), one end of the plunger (4) is communicated with the servo oil channel (101), the other end of the plunger (4) is inserted into the first oil duct (311) in a sliding mode, one end of the third oil duct (41) is communicated with the fuel oil channel (102), and the other end of the third oil duct is communicated with the first oil duct (311);

the resetting structure (5) is arranged in the mounting cavity, and the resetting structure (5) is configured to always provide elastic force for the needle valve (31) to move to the first position.

2. The pressurized fluid injection device according to claim 1, further comprising a limiting sleeve (6) fixedly disposed in the housing (1), wherein the needle valve (31) is disposed in the limiting sleeve (6) in a penetrating manner, a stop protrusion (61) is disposed on the inner side of the limiting sleeve (6), a protrusion (314) is disposed on the needle valve (31), the protrusion (314) is close to the needle valve seat (32) relative to the stop protrusion (61), and when the needle valve (31) is located at the second position, the protrusion (314) abuts against the stop protrusion (61).

3. The pressurized fluid injection apparatus according to claim 2, wherein the returning structure (5) includes an elastic member (51), an upper seat (52), and a lower seat (53), the upper seat (52) is disposed in the mounting cavity, the lower seat (53) abuts against the needle valve (31), the lower seat (53) is capable of sliding relative to the upper seat (52), the elastic member (51) is sleeved on the plunger (4) and abuts between the upper seat (52) and the lower seat (53), and the plunger (4) passes through the upper seat (52) and the lower seat (53) and is inserted into the first oil passage (311).

4. The pressurized fluid injection device according to claim 3, wherein a first limit step (103) is provided in the housing (1), and the upper seat (52) abuts between the first limit step (103) and the limit sleeve (6).

5. The pressurized fluid injection apparatus according to claim 3, wherein the plunger (4) is provided with a second limit step (43), and when the needle valve (31) is located at the second position, the second limit step (43) abuts against the lower seat (53).

6. The pressurized fluid ejection device according to claim 2, wherein the housing (1) includes an upper housing (11) and a close cap (12), the upper housing (11) and the close cap (12) are connected to form the mounting cavity, a third limit step (121) is provided inside the close cap (12), and the upper housing (11) is configured to press the limit sleeve (6) against the third limit step (121).

7. The supercharged fluid injection apparatus according to claim 1, wherein one end of the needle valve (31) protrudes into the second oil passage (321), and a boss (313) is provided at the end, and an oil passage hole (312) communicating the first oil passage (311) and the oil receiving groove (301) is formed in the boss (313), and when the needle valve (31) is located at the first position, the second oil passage (321) is blocked by the boss (313).

8. The supercharged fluid injection apparatus according to claim 1, wherein the plunger (4) is provided with an annular oil passage (42) communicating with the third oil passage (41), and the annular oil passage (42) is always communicated with the fuel passage (102) so that fuel can enter the oil receiving groove (301).

9. The supercharged fluid injection apparatus according to claim 1, characterized in that a check valve (105) is provided in the fuel passage (102), the check valve (105) opening in a direction directed toward the third oil passage (41).

10. An internal combustion engine comprising a pressurized fluid injection apparatus according to any one of claims 1-9.

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