Sealing oil hydraulic system and engine

Abstract

The utility model relates to the technical field of engines, in particular to a sealing oil hydraulic system and an engine. The hydraulic pump is communicated with the hydraulic oil tank; the reversing control valve group is provided with an oil inlet, a first control port, a second control port and an oil return port which are communicated with the hydraulic pump; the high-pressure output valve group is communicated with the first control port and is used for outputting high-pressure hydraulic oil so as to seal an oil nozzle of an engine unit; and the low-pressure output valve group is communicated with the first control port and is used for outputting low-pressure hydraulic oil. The hydraulic pump can be prevented from being frequently started, the stability of output oil pressure is guaranteed, and meanwhile the requirement for high and low pressure output can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to a sealing oil hydraulic system and an engine. Background Art

[0002] Since the cost of methanol is relatively low, about 25-30% of the cost of diesel, methanol has begun to be used as a ship fuel, and the supporting equipment that meets the working requirements of methanol engines must also be improved. The sealing oil hydraulic unit is mainly used to provide high-pressure sealing oil for the injectors of the methanol engine group and low-pressure sealing oil for the adapter module. The hydraulic sealing oil unit is integrated in the middle position of the main engine flywheel end. It has a compact structure, is easy and quick to operate, and has extremely high safety. However, in the prior art, the sealing oil hydraulic unit can only achieve one pressure output and cannot effectively meet the needs of different pressure outputs. In addition, the hydraulic pump needs to be started frequently to ensure the stability of the output oil pressure, resulting in a short service life of the hydraulic pump, and the response speed of the hydraulic pump will affect the stability of the output oil pressure.

[0003] Therefore, a sealed oil hydraulic system and an engine are needed to solve the above problems. Utility Model Content

[0004] The utility model aims to provide a sealing oil hydraulic system and an engine, which can avoid frequent starting of a hydraulic pump, ensure the stability of the output oil pressure, and realize the needs of high and low pressure output.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] Sealed oil hydraulic system, including:

[0007] Hydraulic oil tank;

[0008] a hydraulic pump, the hydraulic pump being in communication with the hydraulic oil tank;

[0009] a reversing control valve group, comprising an oil inlet connected to the hydraulic pump, a first control port, a second control port and an oil return port, wherein the second control port and the oil return port are both connected to the hydraulic oil tank, and when the reversing control valve group is in a first control position, the oil inlet is connected to the first control port, and when the reversing control valve group is in a second control position, the oil inlet is connected to the second control port;

[0010] a high-pressure output valve group, the high-pressure output valve group being in communication with the first control port and being used for outputting high-pressure hydraulic oil to seal the fuel injection nozzle of the engine unit;

[0011] A low-pressure output valve group is connected to the first control port and is used for outputting low-pressure hydraulic oil.

[0012] Furthermore, it also includes an accumulator, which is communicated with the first control port, and a stop valve is arranged in series between the accumulator and the first control port.

[0013] Furthermore, it also includes a pressure sensor, which is arranged on the pipeline between the accumulator and the first control port and is used to detect the pressure of the accumulator.

[0014] Furthermore, it also includes a first pressure relief valve, which is communicated with the oil inlet and the oil return port respectively.

[0015] Furthermore, it also includes a second pressure relief valve, which is connected to the accumulator and the oil return port, and the pressure relief pressure of the second pressure relief valve is greater than the pressure relief pressure of the first pressure relief valve.

[0016] Furthermore, it also includes an electromagnetic relief valve, which is connected to the accumulator and the hydraulic oil tank.

[0017] Furthermore, it also includes an oil replenishing valve group, which is connected to the oil inlet of the hydraulic pump, and the oil replenishing valve group can be opened or closed to realize oil replenishment or stop oil replenishment.

[0018] Furthermore, a first liquid level gauge and a second liquid level gauge are provided in the hydraulic oil tank.

[0019] Furthermore, a first liquid level switch and a second liquid level switch are provided in the hydraulic oil tank, the first liquid level switch is used to detect the maximum liquid level in the hydraulic oil tank and the minimum liquid level in the hydraulic oil tank, and the second liquid level switch is used to detect the maximum limit liquid level in the hydraulic oil tank and the minimum limit liquid level in the hydraulic oil tank.

[0020] The engine comprises an engine body and the sealing oil hydraulic system as described above, wherein the high-pressure output valve group of the sealing oil hydraulic system is used to seal the oil injection nozzle of the engine body.

[0021] Beneficial effects of the utility model:

[0022] The utility model provides a sealing oil hydraulic system, wherein the hydraulic pump is connected with the hydraulic oil tank and the oil inlet of the reversing control valve group, and the second control port and the oil return port are both connected with the hydraulic oil tank. The high-pressure output valve group and the low-pressure output valve group are both connected with the first control port of the reversing control valve group. When it is necessary to output high pressure and low pressure, the reversing control valve group is in the first control position, the oil inlet is connected with the first control port, and the hydraulic oil enters the high-pressure output valve group and the low-pressure output valve group through the oil inlet and the first control port, so as to realize the output of high pressure and low pressure, and meet the needs of different pressure outputs. When it is not necessary to output high-pressure hydraulic oil and low-pressure hydraulic oil, the reversing control valve is in the second control position, the oil inlet is connected with the second control port, and the second control port directly returns oil, so as to realize the circulation of hydraulic oil from the hydraulic pump, the reversing control valve group and the hydraulic oil tank without stopping the hydraulic pump, so as to avoid frequent starting of the hydraulic pump. At the same time, when it is necessary to output high-pressure hydraulic oil and low-pressure hydraulic oil, the reversing control valve group can be quickly switched, so as to ensure the response speed and the stability of the output oil pressure.

[0023] The utility model provides an engine, comprising an engine body and the sealing oil hydraulic system as described above, which can avoid frequent starting of the hydraulic pump, ensure the stability of the output oil pressure, and meet the needs of high and low pressure output. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0025] Figure 1 The utility model is a schematic diagram of a sealing oil hydraulic system.

[0026] In the figure:

[0027] 1. Hydraulic oil tank; 11. First liquid level gauge; 12. Second liquid level gauge; 13. First liquid level switch; 14. Second liquid level switch; 15. Temperature sensor; 2. Hydraulic pump; 21. Filter; 3. Reversing control valve group; 31. First pressure relief valve; 4. High-pressure output valve group; 5. Low-pressure output valve group; 6. Accumulator; 61. Stop valve; 62. Second pressure relief valve; 63. Solenoid relief valve; 64. Pressure sensor; 7. Oil replenishing valve group. DETAILED DESCRIPTION

[0028] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

[0029] In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0030] In the present application, the terms "connect", "combine", "couple", and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0031] In the present application, it will be understood by those of ordinary skill in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerances caused by manufacturing, assembly, and use associated with a specific value, and the like. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0032] In this application, it will be understood by those skilled in the art that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0033] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

[0034] In the process of working of the sealing oil hydraulic system, in order to avoid frequent starting of the hydraulic pump, ensure the stability of the output oil pressure, and realize the needs of high and low pressure output, such as Figure 1 As shown, the utility model provides a sealing oil hydraulic system. The sealing oil hydraulic system comprises a hydraulic oil tank 1, a hydraulic pump 2, a reversing control valve group 3, a low-pressure output valve group 5 and a high-pressure output valve group 4.

[0035] Among them, the hydraulic pump 2 is connected to the hydraulic oil tank 1. The reversing control valve group 3 has an oil inlet, a first control port, a second control port and an oil return port connected to the hydraulic pump 2. The second control port and the oil return port are both connected to the hydraulic oil tank 1. When the reversing control valve group 3 is in the first control position, the oil inlet is connected to the first control port. When the reversing control valve group 3 is in the second control position, the oil inlet is connected to the second control port. The high-pressure output valve group 4 is connected to the first control port and is used to output high-pressure hydraulic oil to seal the fuel injection nozzle of the engine unit. The low-pressure output valve group 5 is connected to the first control port and is used to output low-pressure hydraulic oil.

[0036] When high pressure and low pressure need to be output, the reversing control valve group 3 is in the first control position, the oil inlet is connected to the first control port, and the hydraulic oil enters the high pressure output valve group 4 and the low pressure output valve group 5 through the oil inlet and the first control port, so as to realize the output of high pressure and low pressure and meet the needs of different pressure output. When high pressure hydraulic oil and low pressure hydraulic oil do not need to be output, the reversing control valve is in the second control position, the oil inlet is connected to the second control port, and the second control port directly returns the oil, so as to realize the circulation of hydraulic oil from the hydraulic pump 2, the reversing control valve group 3 and the hydraulic oil tank 1 without stopping the hydraulic pump 2, so as to avoid frequent starting of the hydraulic pump 2. At the same time, when high pressure hydraulic oil and low pressure hydraulic oil need to be output, the reversing control valve group 3 can be quickly switched, which can ensure the response speed and the stability of the output oil pressure.

[0037] Furthermore, the sealing oil hydraulic system also includes an accumulator 6, which is connected to the first control port, and a stop valve 61 is arranged in series between the accumulator 6 and the first control port. By arranging the accumulator 6, during the operation of the low-pressure output valve group 5 and the high-pressure output valve group 4, the hydraulic oil pumped by the hydraulic pump 2 can be stored, or the hydraulic oil stored by itself can be discharged to supplement the use needs of the low-pressure output valve group 5 and the high-pressure output valve group 4, thereby eliminating the pressure fluctuation during the operation of the sealing oil hydraulic system, and further ensuring the stability of the output oil pressure. In this embodiment, one accumulator 6 is arranged, and in other embodiments, multiple accumulators 6 can be arranged as needed, or hydraulic pumps 2 with different displacements can be selected according to the needs of the oil filling time of the accumulator 6, and no excessive restrictions are made here.

[0038] Furthermore, the sealing oil hydraulic system further includes a pressure sensor 64, which is arranged on the pipeline between the accumulator 6 and the first control port, and is used to detect the pressure of the accumulator 6. Under normal working conditions, the hydraulic oil passes through the hydraulic pump 2 from the hydraulic oil tank 1, and then reaches the reversing control valve group 3 through the filter 21, and then returns to the oil tank again through the reversing valve group. When the control system detects that the pressure consumption of the accumulator 6 is reduced to a set value through the pressure sensor 64, the control system will control the reversing control valve group 3 to be in the first control position to charge the accumulator 6. When the pressure of the accumulator 6 reaches the set upper limit value, the control system will control the reversing control valve group 3 to switch back to the second control position again, so that the oil is filtered and circulated from the hydraulic oil tank 1 to the hydraulic oil tank 1. During the operation of the sealing oil hydraulic system, if the pressure of the accumulator 6 is consumed and reduced to the set value again, the control system will sense and control the reversing control valve group 3 to switch to the first control position through the pressure sensor 64, so as to charge the accumulator 6 again. When the pressure of the accumulator 6 reaches the set upper limit again, the control system will control the reversing valve to switch back to the second control position again, so that the oil will be filtered and circulated from the hydraulic oil tank 1 to the hydraulic oil tank 1 again. This repeated cycle achieves the goal of stable oil supply. This design not only improves the stability and reliability of the sealing oil hydraulic system, but also extends the service life of the hydraulic oil. Through the cooperation of the control system and the pressure sensor 64, a continuous and stable supply of hydraulic oil is ensured, providing a strong guarantee for the normal operation of the entire sealing oil hydraulic system. In this embodiment, the control system can be a single-chip microcomputer or a PLC, and no excessive restrictions are made here.

[0039] Furthermore, the sealing oil hydraulic system also includes a first pressure relief valve 31, which is connected to the oil inlet and the oil return port respectively. During the operation of the sealing oil hydraulic system, if the reversing control valve group 3 cannot be switched from the first control position to the second control position due to a fault, the accumulator 6 will continue to be in a liquid-filled state. By setting the first pressure relief valve 31, when the pressure relief pressure of the first pressure relief valve 31 is reached, the oil can directly enter the oil return port through the first pressure relief valve 31 and then return to the hydraulic oil tank 1, thereby playing a role of pressure relief, ensuring that the sealing oil hydraulic system can operate safely and stably.

[0040] Furthermore, the sealing oil hydraulic system also includes a second pressure relief valve 62, which is connected to the accumulator 6 and the oil return port, and the pressure relief pressure of the second pressure relief valve 62 is greater than the pressure relief pressure of the first pressure relief valve 31. If the pressure of the first pressure relief valve 31 fails and continues to soar, when it rises to the opening pressure of the second pressure relief valve 62, the second pressure relief valve 62 opens to relieve the pressure of the accumulator 6, thereby ensuring the safety of the entire sealing oil hydraulic system. In this embodiment, the first pressure relief valve 31 is a 120Bar safety valve, and the second pressure relief valve 62 is a 140Bar safety valve. In other embodiments, the pressures of the first pressure relief valve 31 and the second pressure relief valve 62 can also be set as needed, without making too many restrictions here.

[0041] Furthermore, the sealing oil hydraulic system further includes an electromagnetic relief valve 63, which is connected to the accumulator 6 and the hydraulic oil tank 1. When the sealing oil hydraulic system is working to charge the accumulator 6, and when the accumulator 6 is stabilizing the pressure, the electromagnetic relief valve 63 is in a closed state. When the sealing oil hydraulic system stops working, the electromagnetic relief valve 63 is energized and in an open state, and the hydraulic oil in the accumulator 6 is discharged into the hydraulic oil tank 1.

[0042] Furthermore, the sealing oil hydraulic system also includes an oil replenishing valve group 7, which is connected to the oil inlet of the hydraulic pump 2. The oil replenishing valve group 7 can be opened or closed to realize oil replenishment or stop the oil replenishment action. When the hydraulic oil in the hydraulic oil tank 1 is at a low level and needs to be replenished, the oil replenishing valve group 7 is opened, and the hydraulic pump 2 works to pass the hydraulic oil through the oil replenishing valve group 7 and the reversing control valve group 3 and then enter the hydraulic oil tank 1 for oil replenishment. The hydraulic oil can be sucked by the hydraulic pump 2 to speed up the entry of the hydraulic oil into the hydraulic oil tank 1. In addition, the filter 21 at the outlet of the hydraulic pump 2 can be used to filter the replenished hydraulic oil, thereby ensuring the cleanliness of the hydraulic oil entering the hydraulic oil tank 1.

[0043] Furthermore, a first liquid level gauge 11 and a second liquid level gauge 12 are provided in the hydraulic oil tank 1. By providing two liquid level gauges, a mutual verification function can be achieved, thereby facilitating determination of the amount of hydraulic oil in the hydraulic oil tank 1. In this embodiment, both the first liquid level gauge 11 and the second liquid level gauge 12 are visual liquid level gauges.

[0044] Furthermore, a first liquid level switch 13 and a second liquid level switch 14 are provided in the hydraulic oil tank 1. The first liquid level switch 13 is used to detect the highest liquid level in the hydraulic oil tank 1 and the lowest liquid level in the hydraulic oil tank 1, and the second liquid level switch 14 is used to detect the highest limit liquid level in the hydraulic oil tank 1 and the lowest limit liquid level in the hydraulic oil tank 1. Among them, the height of the highest liquid level is less than the height of the highest limit liquid level, and the height of the lowest liquid level is higher than the height of the lowest limit liquid level. The first liquid level switch 13 and the second liquid level switch 14 are both electrically connected to the control system. The liquid level of the hydraulic oil tank 1 can be accurately detected by the first liquid level switch 13 and the second liquid level switch 14. Moreover, when the first liquid level switch 13 fails, the second liquid level switch 14 can still measure the lowest limit liquid level and the highest limit liquid level to ensure the safety of the sealing oil hydraulic system.

[0045] Furthermore, a temperature sensor 15 is provided in the cover of the hydraulic oil tank 1, and the temperature sensor 15 is electrically connected to the control system. The temperature of the hydraulic oil can be detected in real time through the temperature sensor 15. Two ventilation ports are provided on the hydraulic oil tank 1, which can connect the hydraulic oil tank 1 with the outside world, thereby protecting the hydraulic oil tank 1.

[0046] The working process of this sealing oil hydraulic system is as follows:

[0047] Start pressure accumulation process: The hydraulic oil is sucked out from the hydraulic oil tank 1 by the hydraulic pump 2 and passes through the filter 21. The filter 21 is equipped with a pressure differential switch. Once the filter 21 is dirty and blocked and a certain pressure differential value is generated, the pressure differential switch on the filter 21 will be triggered, and a pressure differential signal will be output to the control system to prompt the replacement of the filter 21 or shutdown for maintenance. After the hydraulic oil passes through the filter 21, it reaches the reversing control valve group 3. The control system monitors the pressure of the accumulator 6 in real time through the pressure sensor 64 to control the reversing control valve group 3. The control system is set with a pressure accumulation value and a stop pressure accumulation value. When the pressure is lower than the pressure accumulation setting value, the control system will issue a control command to the reversing control valve group 3. After receiving the command, the reversing control valve group 3 is adjusted to the first control position, changing the flow direction of the hydraulic oil to charge through the accumulator 6. When the pressure of the sealing oil hydraulic system reaches the stop pressure accumulation value. After the control system issues a stop command, the reversing control valve group 3 switches the flow direction of the hydraulic oil back to the hydraulic oil tank 1.

[0048] External pressure output process: The control system outputs pressure to the outside by controlling the high-pressure output valve group 4 and the low-pressure output valve group 5 according to actual needs. Both the high-pressure output valve group 4 and the low-pressure output valve group 5 are equipped with pressure regulating valves to provide different pressure ranges according to actual needs.

[0049] Stop process: When the sealing oil unit stops, the hydraulic pump 2 stops running, the reversing control valve group 3 is in the second control position, and the electromagnetic relief valve 63 is in the open state, so that the hydraulic oil in the accumulator 6 flows into the hydraulic oil tank 1.

[0050] Filling process: During filling, the external supply pressure must be greater than the static pressure provided by the hydraulic oil tank 1. When the control system receives the low liquid level alarm from the second liquid level switch 14, the control system will issue an oil replenishment command to the oil replenishment valve group 7. The hydraulic oil will be sucked in through the hydraulic pump 2, reach the oil replenishment valve group 7 through the external port, and then reach the accumulator 6 through the reversing control valve group 3. After that, it will participate in pressure storage and directly flow back to the hydraulic oil tank 1. When the liquid level triggers the first liquid level switch 13, the control system will issue a stop oil replenishment command to finally achieve oil replenishment.

[0051] This embodiment also provides an engine, including an engine body and the above sealing oil hydraulic system, wherein the high-pressure output valve group 4 of the sealing oil hydraulic system is used to seal the fuel injection nozzle of the engine body, thereby avoiding frequent starting of the hydraulic pump 2, ensuring the stability of the output oil pressure, and realizing the needs of high and low pressure output.

[0052] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Sealed oil hydraulic system, characterized in that: include: Hydraulic oil tank (1); A hydraulic pump (2), the hydraulic pump (2) being in communication with the hydraulic oil tank (1); a reversing control valve group (3), comprising an oil inlet connected to the hydraulic pump (2), a first control port, a second control port and an oil return port, wherein the second control port and the oil return port are both connected to the hydraulic oil tank (1); when the reversing control valve group (3) is in a first control position, the oil inlet is connected to the first control port, and when the reversing control valve group (3) is in a second control position, the oil inlet is connected to the second control port; a high-pressure output valve group (4), the high-pressure output valve group (4) being in communication with the first control port and being used for outputting high-pressure hydraulic oil to seal the fuel injection nozzle of the engine unit; A low-pressure output valve group (5), the low-pressure output valve group (5) is connected to the first control port and is used for outputting low-pressure hydraulic oil.

2. The sealing oil hydraulic system according to claim 1, characterized in that: It also includes an accumulator (6), the accumulator (6) is in communication with the first control port, and a stop valve (61) is arranged in series between the accumulator (6) and the first control port.

3. The sealing oil hydraulic system according to claim 2, characterized in that: It also includes a pressure sensor (64), which is arranged on a pipeline between the accumulator (6) and the first control port and is used to detect the pressure of the accumulator (6).

4. The sealing oil hydraulic system according to claim 2, characterized in that: It also includes a first pressure relief valve (31), which is communicated with the oil inlet and the oil return port respectively.

5. The sealing oil hydraulic system according to claim 4, characterized in that: It also includes a second pressure relief valve (62), which is connected to the accumulator (6) and the oil return port, and the pressure relief pressure of the second pressure relief valve (62) is greater than the pressure relief pressure of the first pressure relief valve (31).

6. The sealing oil hydraulic system according to claim 2, characterized in that: It also includes an electromagnetic relief valve (63), which is in communication with the accumulator (6) and the hydraulic oil tank (1).

7. The sealing oil hydraulic system according to claim 1, characterized in that: It also comprises an oil replenishing valve group (7), the oil replenishing valve group (7) is connected to the oil inlet of the hydraulic pump (2), and the oil replenishing valve group (7) can be opened or closed to realize the oil replenishing action or stop the oil replenishing action.

8. The sealing oil hydraulic system according to claim 1, characterized in that: The hydraulic oil tank (1) is provided with a first liquid level gauge (11) and a second liquid level gauge (12).

9. The sealing oil hydraulic system according to claim 1, characterized in that: The hydraulic oil tank (1) is provided with a first liquid level switch (13) and a second liquid level switch (14); the first liquid level switch (13) is used to detect the maximum liquid level in the hydraulic oil tank (1) and the minimum liquid level in the hydraulic oil tank (1); the second liquid level switch (14) is used to detect the maximum limit liquid level in the hydraulic oil tank (1) and the minimum limit liquid level in the hydraulic oil tank (1).

10. An engine, characterized in that It comprises an engine body and a sealing oil hydraulic system as claimed in any one of claims 1 to 9, wherein a high-pressure output valve group (4) of the sealing oil hydraulic system is used to seal the fuel injection nozzle of the engine body.

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