Lubricating and sealing structure and hydrogen fuel injector

Abstract

The utility model discloses a lubrication sealing structure and a hydrogen fuel injector, and relates to the technical field of fuel injectors of internal combustion engines, the lubrication sealing structure comprises a valve body and a needle valve, the valve body is internally provided with a first hydrogen channel and a first pressure accumulation cavity communicated with the first hydrogen channel, and the first pressure accumulation cavity is arranged at the lower part of the needle valve; a first annular groove is formed in the circumferential outer side wall of the needle valve, and a counter bore cavity used for oil liquid to be fed and an oil hole communicating the counter bore cavity with the first annular groove are formed in the needle valve. The hydrogen fuel injector comprises the lubricating and sealing structure, an oil nozzle nut, a hydrogen inlet piece, an electromagnetic control piece, an oil inlet piece and a wire harness connector. Through the arrangement of the first annular groove, an oil film can be formed between the needle valve and the valve body, the needle valve is continuously self-lubricated in the movement process of the needle valve, and therefore abrasion between the needle valve and the valve body can be reduced, meanwhile, the oil film between the needle valve and the valve body can seal hydrogen in the first pressure storage cavity, and diffusion of the hydrogen in the first pressure storage cavity is effectively avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fuel injector of internal combustion engine, especially relates to a lubricating sealing structure and hydrogen fuel injector. BACKGROUND

[0002] In response to global climate anomalies, environmental quality decline and energy shortage, "low carbon" or "decarbonization" is the main direction of current international energy utilization. As a new energy that attracts high attention, hydrogen has the advantages of fast burning speed, high thermal efficiency, clean and no pollution, and is widely used in the automobile industry, heavy machinery, shipping and other fields, and the use of hydrogen fuel injection technology has broad prospects. The product of complete combustion of hydrogen is H2O, and no harmful substances such as carbon smoke, hydrocarbons and CO are generated. Compared with traditional internal combustion engines, hydrogen internal combustion engines have the advantages of zero carbon emission, high efficiency and high reliability.

[0003] At present, according to the hydrogen supply mode, hydrogen internal combustion engines can be divided into port fuel injection (PFI) and direct injection (DI) hydrogen internal combustion engines. Hydrogen internal combustion engines using port fuel injection hydrogen supply scheme are prone to abnormal combustion phenomena such as early combustion and backfire during combustion, which directly affects the power, economy and nitrogen oxide emission characteristics of hydrogen fuel internal combustion engines. Direct injection hydrogen internal combustion engines can effectively solve the problems of early combustion and backfire, and significantly improve the power density, which is the best solution to realize the development demand of high power density hydrogen fuel internal combustion engines.

[0004] However, as a key component of direct injection hydrogen internal combustion engines, hydrogen fuel injectors still face some application difficulties. On the one hand, the kinematic viscosity of hydrogen is lower than that of fuel, and it cannot form a lubricating oil film like liquid fuel, so the lubrication effect of hydrogen fuel injectors is poor, and long-term high-speed operation will cause the needle valve and valve body to collide and wear, thereby causing the injector to be damaged and affecting the durability of the whole machine; on the other hand, hydrogen molecules are small and diffuse quickly, so hydrogen fuel injectors need very high sealing. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a kind of lubricating sealing structure, it can realize the lubrication and sealing between needle valve and valve body, reduce the wear between needle valve and valve body.

[0006] To achieve the above object, the utility model adopts the following technical scheme: a kind of lubricating sealing structure, including valve body and needle valve slidably arranged in valve body, first hydrogen channel for passing into hydrogen is opened in valve body, and first pressure accumulation cavity for accumulating hydrogen is communicated with first hydrogen channel, first pressure accumulation cavity is arranged in the lower part of needle valve, first annular groove is opened on the circumferential outer side wall of needle valve, blind hole cavity for passing into oil is opened in needle valve, and oil hole is communicated with first annular groove.

[0007] The technical principle of the utility model is as follows: the oil liquid in the counterbore cavity can enter the first annular groove on the circumferential outer wall of the needle valve through the oil hole, thereby forming an oil film between the needle valve and the valve body, the needle valve continuously self-lubricates in the process of movement, and the wear between the needle valve and the valve body can be reduced. Meanwhile, the oil film between the needle valve and the valve body can also seal the hydrogen in the first pressure accumulation cavity, avoiding the diffusion of hydrogen in the first pressure accumulation cavity.

[0008] Further, the circumferential side wall of the needle valve is also provided with a second annular groove, a third annular groove and a communication groove for communicating the second annular groove and the first annular groove, and the third annular groove is arranged between the first pressure accumulation cavity and the second annular groove.

[0009] Further, the circumferential side wall of the needle valve is also provided with a second annular groove, a third annular groove and a communication groove for communicating the second annular groove and the first annular groove, and the third annular groove is arranged between the first pressure accumulation cavity and the second annular groove.

[0010] Further, the circumferential side wall of the needle valve is also provided with a second annular groove, a third annular groove and a communication groove for communicating the second annular groove and the first annular groove, and the third annular groove is arranged between the first pressure accumulation cavity and the second annular groove.

[0011] Further, the circumferential side wall of the needle valve is also provided with a second annular groove, a third annular groove and a communication groove for communicating the second annular groove and the first annular groove, and the third annular groove is arranged between the first pressure accumulation cavity and the second annular groove.

[0012] Further, the circumferential side wall of the needle valve is also provided with a second annular groove, a third annular groove and a communication groove for communicating the second annular groove and the first annular groove, and the third annular groove is arranged between the first pressure accumulation cavity and the second annular groove.

[0013] Further, the utility model also comprises an oil injector body arranged on the upper side of the valve body, the oil injector body is internally provided with a second pressure accumulation cavity communicated with the first oil channel and a second oil channel for feeding oil liquid into the second pressure accumulation cavity, the pressure tight screw cap is arranged in the second pressure accumulation cavity, and a needle valve spring is arranged in the second pressure accumulation cavity and sleeved on the pressure tight screw cap.

[0014] Another purpose of the utility model is to provide a hydrogen fuel injector which can control the injection of hydrogen.

[0015] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a hydrogen fuel injector, comprising the lubricating sealing structure as described above, further comprising the following sequentially arranged from bottom to top:

[0016] The oil nozzle screw cap is used for fixing the valve body and the oil injector body.

[0017] The hydrogen inlet member is used for feeding hydrogen and is communicated with the first hydrogen channel.

[0018] The electromagnetic control member is used for changing the size of the hydraulic pressure in the second pressure accumulation cavity.

[0019] The oil inlet member is used for feeding oil liquid and is communicated with the second oil channel.

[0020] A wiring harness connector for energizing and electrically connecting to an electromagnetic control for controlling the electromagnetic control.

[0021] Further, the surface of the valve body and the fuel injector body is provided with a convex with a hydraulic ring groove, the fuel injector body is provided with a third oil channel for passing oil and communicating with the hydraulic ring groove and a second hydrogen channel for passing hydrogen and communicating with the first hydrogen channel.

[0022] The utility model discloses the beneficial effects are:

[0023] 1. Through the setting of the first annular groove, the oil film can be formed between the needle valve and the valve body, the needle valve continuously self-lubricates in the process of movement, thereby the wear between the needle valve and the valve body can be reduced, and the oil film between the needle valve and the valve body can also seal the hydrogen in the first pressure accumulation cavity, thereby effectively avoiding the diffusion of hydrogen in the first pressure accumulation cavity.

[0024] 2. Through the setting of the second annular groove, the lubricating effect of the needle valve can be further improved, thereby the wear between the needle valve and the valve body can be further reduced.

[0025] 3. Through the setting of the third annular groove, the hydrogen diffused between the needle valve and the valve body can be depressurized, thereby the sealing capacity of the hydrogen in the first pressure accumulation cavity can be further enhanced, and the third annular groove can also reduce the leakage of oil.

[0026] 4. Compared with the traditional external lubrication, the lubricating structure of the utility model reduces the arrangement of the oil channel on the valve body and reduces the process difficulty.

[0027] 5. Through the setting of the one-way valve spring and the sealing element, the counterbore cavity can be sealed to make the first annular groove and the second annular groove always filled with oil, thereby the lubricating effect between the needle valve and the valve body and the sealing effect of hydrogen can be ensured, and the wear between the needle valve and the valve body can be further reduced. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is the structure schematic view of the needle valve in the utility model;

[0029] Figure 2 It is the sectional view of the valve body and the fuel injector body in the utility model;

[0030] Figure 3 It is Figure 2 The enlarged view of A in the utility model;

[0031] Figure 4 It is the axial side view of the valve body in the utility model;

[0032] Figure 5 It is the perspective view of the fuel injector body in the utility model;

[0033] Figure 6The utility model discloses a front view of hydrogen fuel injector.

[0034] In the above drawings:

[0035] 1, needle valve;101, first annular groove;102, second annular groove;103, third annular groove;104, communication groove;105, oil hole;106, counterbore cavity;107, flat square groove;108, sealing length;

[0036] 2, valve body;201, first pressure accumulation cavity;202, first hydrogen channel;203, protrusion;204, hydraulic annular groove;

[0037] 3, check valve spring;4, sealing element;5, first pressure regulating gasket;

[0038] 6, compression nut;601, first oil channel;

[0039] 7, oil sprayer body;701, second pressure accumulation cavity;702, second oil channel;703, third oil channel;704, second hydrogen channel;

[0040] 8, needle valve spring;9, second pressure regulating gasket;10, sealing gasket;11, oil nozzle nut;12, hydrogen inlet;13, electromagnetic control element;14, oil inlet;15, wire harness connector;16, guide bushing. DETAILED DESCRIPTION

[0041] The technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model, and apparently, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments;The structures described in various embodiments can be freely combined without structural or principle conflicts.

[0042] In the utility model, unless another explicit provision and limitation, the terms "mount", "connect", "link", "fix" and other terms should be understood broadly, for example, can be fixed connection, also can be detachable connection, or integral;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through intermediate medium, can be the communication of two elements or the interaction of two elements. For ordinary skilled in the art, the above terms can be understood according to the specific meaning in the utility model.

[0043] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0044] The following description, in conjunction with the accompanying drawings, describes some embodiments of the present invention:

[0045] like Figures 1-6 As shown, this utility model proposes a lubrication and sealing structure, including a valve body 2 and a needle valve 1 slidably disposed in the valve body 2. The valve body 2 has a first hydrogen passage 202 for introducing hydrogen gas and a first accumulator chamber 201 connected to the first hydrogen passage 202 for accumulating hydrogen gas. The first accumulator chamber 201 is disposed in the lower part of the needle valve 1. A first annular groove 101 is formed on the circumferential outer wall of the needle valve 1. The needle valve 1 has a countersunk cavity 106 for introducing oil and an oil hole 105 connecting the countersunk cavity 106 and the first annular groove 101.

[0046] Sufficient oil is introduced into the countersunk cavity 106. The oil in the countersunk cavity 106 fills the first annular groove 101 through the oil hole 105, thereby forming an oil film between the needle valve 1 and the valve body 2. During the movement of the needle valve 1, the needle valve 1 comes into contact with the oil in the first annular groove 101, continuously self-lubricating, thus reducing wear between the needle valve 1 and the valve body 2. At the same time, the oil film between the needle valve 1 and the valve body 2 can also seal the hydrogen in the first accumulator chamber 201, effectively preventing the diffusion of hydrogen in the first accumulator chamber 201.

[0047] Furthermore, such as Figure 1 As shown, the needle valve 1 also has a second annular groove 102, a third annular groove 103, and a connecting groove 104 for connecting the second annular groove 102 and the first annular groove 101 on its circumferential sidewall. The third annular groove 103 is located between the first accumulator chamber 201 and the second annular groove 102. The needle valve 1 also has a flat rectangular groove 107 on its circumferential sidewall, which facilitates the installation of the clamping nut 6.

[0048] The second ring groove 102 is respectively arranged on the upper and lower sides of the first ring groove 101, and the oil liquid can fill the first ring groove 101 and the second ring groove 102 on the upper and lower sides of the first ring groove 101 at the same time through the communication groove 104. The second ring groove 102 can increase the contact area between the outer surface of the needle valve 1 and the oil liquid, thereby further improving the lubrication effect on the needle valve 1, further reducing the wear between the needle valve 1 and the valve body 2, and further improving the sealing capacity of hydrogen. The communication groove 104 can be multiple, and in order to ensure the hydraulic pressure in the second ring groove 102, the communication groove 104 is preferably two, and the two communication grooves 104 are symmetrically arranged along the vertical center of the needle valve 1. The oil hole 105 is a through hole passing through the center of the needle valve 1, and the included angle between the connecting line of the oil hole 105 to the center of the needle valve 1 and the connecting line of the communication groove 104 to the center of the needle valve 1 is 90°. Through the above arrangement, it can be ensured that the second ring groove 102 can be filled with oil liquid, thereby further ensuring the sealing of hydrogen and the lubrication between the needle valve 1 and the valve body 2.

[0049] The third ring groove 103 is not filled with oil liquid. When the hydrogen in the first pressure accumulation chamber 201 diffuses into the third ring groove 103, the space volume increases, thereby reducing the pressure of the hydrogen, and further enhancing the sealing capacity of the hydrogen in the first pressure accumulation chamber 201.

[0050] There is a gap between the needle valve 1 and the valve body 2. In the working process of the needle valve 1, a small amount of oil liquid in the first ring groove 101 and the second ring groove 102 also leaks. The third ring groove 103 can accommodate the leaked oil liquid, thereby reducing the oil liquid leaked into the first pressure accumulation chamber 201.

[0051] The oil liquid can be selected from diesel oil, engine oil, hydraulic oil and the like. The main function of the oil liquid is sealing and lubrication. When the oil liquid is diesel oil, the oil liquid leaked into the first pressure accumulation chamber 201 will be directly burned to generate a small amount of nitrogen oxides, carbon monoxide, carbon dioxide and aldehydes, which has no effect on the engine. When the oil liquid is engine oil, the combustion products of the oil liquid leaked into the first pressure accumulation chamber 201 will cause engine coking and carbon deposition. However, the viscosity of engine oil is greater than that of diesel oil, so the leakage amount of engine oil is less than that of diesel oil. When the oil liquid is hydraulic oil, the combustion products of the oil liquid leaked into the first pressure accumulation chamber 201 will also cause engine coking and carbon deposition. However, the hydraulic oil has good wear resistance, high-pressure compression resistance, good foam resistance, good lubricity and good stability. In addition, the viscosity of the hydraulic oil is also greater than that of the diesel oil. In summary, the oil liquid is preferably hydraulic oil.

[0052] The length of the needle valve 1 between the third ring groove 103 and the first pressure accumulation chamber 201 is the sealing length 108. The greater the sealing length 108, the lower the risk of oil liquid leakage. Compared with the traditional external lubrication, the lubrication structure of the present scheme reduces the arrangement of the oil channel on the valve body 2, thereby reducing the process difficulty.

[0053] Further, asFigure 2 and Figure 3 Further, as shown in Further, as shown in

[0054] The first pressure adjusting washer 5 is arranged at the bottom of the counterbore cavity 106 and abuts against the one-way valve spring 3. The oil is injected into the counterbore cavity 106 through the first oil passage 601, and then fills the first annular groove 101 and the second annular groove 102 through the oil hole 105 and the communication groove 104. When the counterbore cavity 106, the first annular groove 101 and the second annular groove 102 are all filled with oil, the oil can be effectively prevented from flowing out of the first oil passage 601 under the action of the one-way valve spring 3 and the sealing member 4, so as to ensure the pressure in the counterbore cavity 106, thereby ensuring the continuous lubricating effect and the sealing effect on hydrogen between the needle valve 1 and the valve body 2. The shape and material of the sealing member 4 are not limited, as long as the sealing member 4 can be completely sealed when it is in contact with the compression nut 6 under the action of the one-way valve spring 3. Preferably, the sealing member 4 is a steel ball.

[0055] Further, as shown in Figure 3 The guide bushing 16 is arranged in the counterbore cavity 106 and guides the one-way valve spring 3.

[0056] The guide bushing 16 is press-fitted in the counterbore cavity 106, and the side wall of the counterbore cavity 106 is provided with a stepped surface, which can ensure the consistency of the depth of the guide bushing 16 press-fitted in the counterbore cavity 106. The outer diameter of the one-way valve spring 3 is smaller than the counterbore cavity 106, and the guide bushing 16 can ensure the straightness of the one-way valve spring 3.

[0057] Further, as shown in Figure 2 、 Figure 3 and Figure 5 Further, as shown in Further, as shown in

[0058] The second pressure adjusting washer 9 is arranged on the compression nut 6 and is in contact with the needle valve spring 8. When not working, the oil is injected into the second pressure accumulation cavity 701 through the second oil channel 702 in the injector body 7, and at this time the hydraulic pressure and the elastic force of the needle valve spring 8 jointly act on the compression nut 6. Meanwhile, the hydrogen enters the first pressure accumulation cavity 201 through the first hydrogen channel 202 and exerts an upward force on the needle valve 1, and at this time the force of the hydrogen on the needle valve 1 is less than the combined force of the hydraulic pressure and the needle valve spring 8, and the needle valve 1 remains closed.

[0059] Meanwhile, the oil in the second pressure accumulation cavity 701 enters the first oil channel 601 and exerts a hydraulic pressure on the sealing member 4, and when the force acting on the sealing member 4 is greater than the combined force of the elastic force of the one-way valve spring 3 and the medium in the counterbore cavity 106, the one-way valve spring 3 is compressed, the sealing member 4 is separated from the compression nut 6, the oil enters the counterbore cavity 106 through the second oil channel 702, then enters the first annular groove 101 through the oil hole 105, and then enters the second annular groove 102 through the communication groove 104, thereby being able to lubricate the needle valve 1, and also being able to seal the hydrogen in the first pressure accumulation cavity 201, and under the action of the third annular groove 103, the diffused hydrogen is depressurized, further enhancing the sealing of the hydrogen in the first pressure accumulation cavity 201.

[0060] With the increase of the oil in the counterbore cavity 106, the hydraulic pressure in the counterbore cavity 106 and the pressure in the first oil channel 601 gradually decrease until they are equal, and at this time the hydraulic pressure in the first oil channel 601 is less than the combined force of the counterbore cavity 106 and the one-way valve spring 3, and the one-way valve spring 3 pushes the sealing member 4 to abut against the compression nut 6, thereby sealing the first oil channel 601.

[0061] The hydraulic pressure of the second pressure accumulation cavity 701 is P1, the area acting on the sealing member 4 is S1, and the pressure acting on the sealing member 4 in the second pressure accumulation cavity 701 is F1=P1S1; the elastic force of the one-way valve spring 3 is F 弹； The hydraulic pressure in the counterbore cavity 106 is P2, the area acting on the sealing member 4 is S2, and the pressure acting on the sealing member 4 in the counterbore cavity 106 is F2=P2S2. When F1>F 弹 +F2, the sealing member 4 is separated from the compression nut 6, and the first oil channel 601 is opened; when F1<F 弹 +F2, the sealing member 4 abuts against the compression nut 6, and the first oil channel 601 is sealed.

[0062] Preferably, the design pressure of the injection of the injector is 90-290 bar, the design pressure P1 of the above-mentioned second pressure accumulation cavity 701 is 100-300 bar, the design pressure P2 of the counterbore cavity 106 is 70-190 bar, the design value of the area S1 is 8±0.05 mm 2 , and the design value of the area S2 is 9.5±0.05 mm 2The elastic force of the one-way valve spring 3 is F 弹 The elastic force is greater than 13.5 N (according to the target pressure of the second pressure storage cavity 701 and the counterbore cavity 106).

[0063] For example

[0064] P1=100bar, S1=8mm 2 At this time, F1=80N;

[0065] P2=70bar, S2=9.5mm 2 At this time, F2=66.5;

[0066] According to the size relationship, the sealing member 4 is in abutment with the compression nut 6, and the elastic force F of the one-way valve spring is 弹 The elastic force is greater than 13.5 N, preferably 15 N.

[0067] When working, the oil in the second pressure storage cavity 701 is discharged from the oil return port, and the hydraulic pressure in the second pressure storage cavity 701 is rapidly reduced. At this time, the force of the hydrogen gas in the first pressure storage cavity 201 on the needle valve 1 is greater than the combined force of the hydraulic pressure in the second pressure storage cavity 701 and the needle valve spring 8, the needle valve 1 is lifted by the hydrogen gas, and the hydrogen gas in the first pressure storage cavity 201 is injected. At this time, although the hydraulic pressure in the second pressure storage cavity 701 is reduced, the pressure in the counterbore cavity 106, the first annular groove 101 and the second annular groove 102 remains unchanged under the joint action of the one-way valve spring 3, the compression nut 6 and the sealing member 4, and the lubrication and sealing of the hydrogen gas on the needle valve 1 can be maintained.

[0068] When a small part of the oil in the first annular groove 101 or the second annular groove 102 leaks due to the movement of the needle valve 1, the pressure in the counterbore cavity 106 is reduced. When the second pressure storage cavity 701 is filled with oil next time, the pressure in the counterbore cavity 106 can be supplemented by the above-mentioned mode, so that the lubrication and sealing of the hydrogen gas on the needle valve 1 can be maintained.

[0069] As shown in Figure 6 The utility model also provides a hydrogen fuel injector, including lubrication sealing structure as above-mentioned, still include from below to above sequentially set up:

[0070] The oil nozzle nut 11 is used for fixing the valve body 2 and the oil injector body 7;

[0071] The hydrogen inlet member 12 is used for passing in hydrogen and communicates with the first hydrogen channel 202;

[0072] The electromagnetic control member 13 is used for changing the size of the hydraulic pressure in the second pressure storage cavity 701;

[0073] The oil inlet member 14 is used for passing in oil and communicates with the second oil channel 702 and the third oil channel 703.

[0074] A wire harness connector 15 is used to supply power and electrically connect with the electromagnetic control member 13 for controlling the electromagnetic control member 13.

[0075] The oil nozzle nut 11 is used to connect the oil injector body 7 and the valve body 2. The hydrogen inlet member 12 and the first hydrogen passage 202 are used to supply hydrogen into the second hydrogen passage 704 and the first pressure accumulation cavity 201. In order to ensure the pressure of hydrogen in the first pressure accumulation cavity 201, the first hydrogen passage 202 and the second hydrogen passage 704 are both multiple, and the number of the first hydrogen passage 202 and the second hydrogen passage 704 are equal. Here, the first hydrogen passage 202 and the second hydrogen passage 704 are preferably four.

[0076] The oil nozzle nut 11, the hydrogen inlet member 12, the electromagnetic control member 13, the oil inlet member 14 and the wire harness connector 15 are all prior art, and their structures are not described here.

[0077] Further, the surface of the valve body 2 and the oil injector body 7 is provided with a convex 203 with a hydraulic ring groove 204. The oil injector body 7 is provided with a third oil passage 703 for supplying oil and communicating with the hydraulic ring groove 204.

[0078] Through the action of the third oil passage 703 and the hydraulic ring groove 204, the joint surface of the valve body 2 and the oil injector body 7 can be sealed to prevent hydrogen leakage at the joint surface of the first hydrogen passage 202 and the second hydrogen passage 704.

Claims

1. A lubricated seal construction characterized by: The valve body (2) and the needle valve (1) slidingly arranged in the valve body (2) are included, the first hydrogen channel (202) for hydrogen inlet and the first pressure accumulation cavity (201) for pressure accumulation hydrogen in communication with the first hydrogen channel (202) are opened in the valve body (2), the first pressure accumulation cavity (201) is located at the lower part of the needle valve (1), the first ring groove (101) is opened on the circumferential side wall of the needle valve (1), the counterbore cavity (106) for oil inlet and the oil hole (105) in communication with the counterbore cavity (106) and the first ring groove (101) are opened in the needle valve (1).

2. A lubricated seal construction according to claim 1 wherein, The second ring groove (102) and the third ring groove (103) are also opened on the circumferential side wall of the needle valve (1), and the communication groove (104) for communication between the second ring groove (102) and the first ring groove (101) is arranged between the first pressure accumulation cavity (201) and the second ring groove (102).

3. A lubricated seal arrangement according to claim 1 or 2, wherein The flat square groove (107) is opened on the circumferential side wall of the needle valve (1).

4. A lubricated seal according to claim 1 or 2, wherein The one-way valve spring (3) arranged in the counterbore cavity (106) and the compression nut (6) fixed in the counterbore cavity (106) and opened with the first oil channel (601) for oil inlet into the counterbore cavity (106) are also included, and the sealing element (4) for sealing the first oil channel (601) is arranged between the one-way valve spring (3) and the compression nut (6).

5. A lubricated seal construction according to claim 4, wherein The sealing gasket (10) is arranged between the compression nut (6) and the needle valve (1).

6. A lubricated seal construction according to claim 4 wherein, The guide bushing (16) for guiding the one-way valve spring (3) is arranged in the counterbore cavity (106).

7. A lubricated seal construction according to claim 4 wherein, The oil injector body (7) arranged on the upper side of the valve body (2) is also included, the second pressure accumulation cavity (701) in communication with the first oil channel (601) and the second oil channel (702) for oil inlet into the second pressure accumulation cavity (701) are opened in the oil injector body (7), the compression nut (6) is arranged in the second pressure accumulation cavity (701), and the needle valve spring (8) sleeved on the compression nut (6) is arranged in the second pressure accumulation cavity (701).

8. A lubricated seal according to claim 5 or 6, wherein The oil injector body (7) arranged on the upper side of the valve body (2) is also included, the second pressure accumulation cavity (701) in communication with the first oil channel (601) and the second oil channel (702) for oil inlet into the second pressure accumulation cavity (701) are opened in the oil injector body (7), the compression nut (6) is arranged in the second pressure accumulation cavity (701), and the needle valve spring (8) sleeved on the compression nut (6) is arranged in the second pressure accumulation cavity (701).

9. A hydrogen fuel injector characterized by, The lubricating sealing structure of claim 7 or 8 is also included, and the oil nozzle nut (11) for fixing the valve body (2) and the oil injector body (7) is arranged from bottom to top. The hydrogen inlet element (12) for hydrogen inlet and in communication with the first hydrogen channel (202) is arranged. The electromagnetic control element (13) for changing the size of the hydraulic pressure in the second pressure accumulation cavity (701) is arranged. The oil inlet element (14) for oil inlet and in communication with the second oil channel (702) is arranged. The wire harness connector (15) for power supply and in electrical connection with the electromagnetic control element (13) for controlling the electromagnetic control element (13) is arranged. ​ 10. A hydrogen fuel injector according to claim 9, wherein The surface of the valve body (2) connected with the injector body (7) is provided with a convex (203) with a hydraulic ring groove (204), the injector body (7) is provided with a third oil channel (703) for passing oil and communicating with the hydraulic ring groove (204) and a second hydrogen channel (704) for passing hydrogen and communicating with the first hydrogen channel (202).

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