Gas fuel supply device for diesel engine test

Abstract

The invention relates to the technical field of gas fuel gas supply, and discloses a gas fuel gas supply device for a diesel engine test, which comprises a buffer barrel, supporting legs are fixed on the lower surface of the buffer barrel, a fixing plate is fixed on the outer walls of the supporting legs, an exhaust pipe penetrates through one side of the buffer barrel, an electromagnetic valve is arranged in the exhaust pipe, and a gas inlet is formed in the other side of the buffer barrel. A diesel engine body is fixed to a port of the exhaust pipe. And the conveying assembly is arranged on the fixing plate, the conveying assembly comprises a conveying pump, an air inlet pipe is fixed to the output end of the conveying pump, and the lower surface of the conveying pump is fixed to the upper surface of the fixing plate. Through cooperation of the conveying assembly and the heating regeneration assembly, drying pretreatment is carried out when fuel gas is conveyed, meanwhile, drying treatment is carried out on a silica gel adsorption plate through the heating regeneration assembly, and the problems that due to excessive moisture in the fuel gas, mixed gas is unstable, combustion is incomplete, and an engine system is corroded are solved.

Description

Technical Field

[0001] The invention relates to the technical field of gas fuel supply, in particular to a gas fuel supply device for diesel engine testing. Background Art

[0002] The sources of gas fuels are mainly natural gas obtained from underground mining; coke oven gas, water gas or generator gas obtained from solid fuels through dry distillation or gasification; associated gas that overflows from oil wells along with oil and gas produced during oil processing; coal gas obtained from liquid fuel processing; blast furnace gas produced during blast furnace smelting, etc. Diesel engines are widely used as a power source and are often used in various mechanical equipment. However, with the improvement of environmental protection requirements, the combustion efficiency and emission control of diesel engines have become the focus of attention. In order to reduce pollution to the environment, more and more diesel engines are beginning to use gas fuels (such as natural gas and synthetic gas) instead of traditional diesel.

[0003] If the water in the gas fuel is not effectively removed, the mixed gas will be unstable and the combustion will be incomplete, which will cause problems such as reduced engine efficiency and substandard emissions. Traditional drying devices are often unable to handle trace amounts of water in the gas, or have poor drying effects due to their simple structures, making it difficult to adapt to the needs of various gas fuels. Many devices only rely on basic gas filtration or simple water separation, and fail to perform more sophisticated pretreatment. As a result, water accumulates for a long time, and in severe cases, it may even damage the engine system and shorten its service life.

[0004] Many systems fail to properly address the uniformity of gas and air mixing, resulting in an inaccurate gas and air ratio, which in turn affects combustion efficiency. Even if some systems use mixers and buffer devices, the design of these devices is relatively rough, and the flow path and airflow adjustment are not fine enough, resulting in insufficient or excessive mixing. The mixing ratio of gas and air directly affects the combustion process. Uneven mixing often leads to incomplete combustion, power loss, and may even cause emissions to exceed the standard. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a gas fuel supply device for diesel engine testing, which solves the problems of excessive water in the fuel gas leading to unstable mixed gas, incomplete combustion and corrosion of the engine system.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a gas fuel supply device for diesel engine testing, comprising: a buffer barrel, a support foot is fixed to the lower surface of the buffer barrel, a fixing plate is fixed to the outer wall of the support foot, an exhaust pipe is passed through one side of the buffer barrel, a solenoid valve is arranged inside the exhaust pipe, and a diesel engine body is fixed to the port of the exhaust pipe; a delivery component is arranged on the fixing plate, the delivery component comprises a delivery pump, an intake pipe is fixed to the output end of the delivery pump, the lower surface of the delivery pump is fixed to the upper surface of the fixing plate, the outer wall of the intake pipe passes through the bottom of the buffer barrel, and the A left-right symmetrical telescopic rod is fixed to the bottom end of the intake pipe, a piston is fixed to the driving end of the telescopic rod, the outer wall of the piston is arranged at the port of the intake pipe, a drying box is fixed to the upper end of the outer wall of the intake pipe, and a silica gel adsorption plate that is symmetrical up and down is fixed inside the drying box; a heating regeneration component is arranged on the outer wall of the buffer barrel, and is used to dry the silica gel adsorption plate; a mixing component is arranged on the outer wall of the buffer barrel, and is used to mix the gas and air; a voltage stabilizing component is arranged on the exhaust pipe, and is used to stabilize the pressure inside the exhaust pipe; a cooling component is arranged on the outer wall of the exhaust pipe, and is used to cool the gas inside the exhaust pipe.

[0007] Preferably, the heating regeneration component comprises a heating box, the outer wall of the heating box is fixed to the outer wall of the buffer barrel, a left-right symmetrical fan is passed through one side of the heating box, and a ceramic heater is passed through the top of the heating box.

[0008] Preferably, an air duct penetrates one side of the heating box, the outer wall of the air duct penetrates the outer wall of the drying box, a circular diverter pipe is fixed to the end of the air duct, the outer wall of the circular diverter pipe is arranged in the middle of two silica gel adsorption plates, a connecting plate is fixed to the outer wall of the circular diverter pipe, and the outer wall of the connecting plate is fixed to the inner wall of the drying box.

[0009] Preferably, the mixing assembly includes an air purifier, the outer wall of the air purifier is fixed to the outer wall of the buffer barrel, an air pump is fixed to the outer wall of the air purifier, a connecting pipe is fixed to the output end of the air purifier, the end of the connecting pipe is connected to the input end of the air pump, and a diverter pipe 1 is fixed to the output end of the air pump.

[0010] Preferably, a plurality of delivery pipes are passed through the outer wall of the diversion pipe, the outer walls of the delivery pipes all pass through the outer wall of the buffer barrel, nozzles are fixed at the ends of the delivery pipes, a spiral guide plate is fixed on the inner wall of the buffer barrel, a return pipe is passed through the top of the buffer barrel, the other end of the return pipe is fixed to the bottom end of the buffer barrel, and one-way valves are provided inside the return pipe and the air guide pipe.

[0011] Preferably, the voltage stabilizing assembly includes a shell, an inner wall of the shell is fixed to the outer wall of the exhaust pipe, a pressure sensor passes through one side of the shell, a flow guide tube passes through the top of the shell, a control valve is arranged inside the flow guide tube, the other end of the flow guide tube passes through the bottom end of the shell, and the pressure sensor and the control valve are electrically connected.

[0012] Preferably, a partition is fixed inside the shell, a porous plate is fixed on the lower surface of the partition, an outer wall of the porous plate is arranged on one side of the end of the exhaust pipe, and a pressure relief pipe penetrates the inner wall of the partition.

[0013] Preferably, a connecting block is fixed inside the pressure relief pipe, one end of a tension spring is fixed to the upper surface of the connecting block, a sealing block is fixed to the other end of the tension spring, the outer wall of the sealing block slides on the top of the pressure relief pipe, and an air outlet cover is fixed to the top of the sealing block.

[0014] Preferably, the cooling assembly comprises a cooling jacket, and the inner wall of the cooling jacket is fixed to the outer wall of the exhaust pipe.

[0015] Preferably, a water inlet pipe penetrates one side of the cooling jacket, a drain pipe penetrates one side of the cooling jacket, and switch valves are provided inside the water inlet pipe and the drain pipe.

[0016] The present invention provides a gas fuel supply device for diesel engine testing, which has the following beneficial effects:

[0017] 1. The present invention achieves drying pretreatment when conveying the fuel gas through the cooperation between the conveying component and the heating and regeneration component. At the same time, the silica gel adsorption plate is dried by the heating and regeneration component, which solves the problem of excessive moisture in the fuel gas leading to unstable mixed gas, incomplete combustion and corrosion of the engine system. It can effectively remove moisture from the gas and prevent moisture accumulation from affecting subsequent combustion and engine performance.

[0018] 2. The present invention achieves repeated mixing of gas and air through the coordination of the internal structures of the mixing components, improves the efficiency of subsequent combustion, and solves the technical problems of uneven mixing of gas and air, resulting in low combustion efficiency and excessive emissions. By optimizing the mixing method and the flow path in the buffer barrel, it can ensure that the gas and air are fully mixed in an appropriate proportion.

[0019] 3. The present invention achieves the goal of lowering the internal pressure of the exhaust pipe while cooling the fuel gas delivered to the diesel engine through the cooperation between the voltage stabilizing component and the cooling component, further improving the combustion efficiency and solving the problems of unstable engine operation, low combustion efficiency and excessive heat loss caused by unstable fuel gas pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A perspective view of the present invention;

[0021] Figure 2 It is a partial structural schematic diagram of a diesel engine of the present invention;

[0022] Figure 3 This is a schematic diagram of the internal structure of the buffer barrel of the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the drying box of the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of the air intake pipe part of the present invention;

[0025] Figure 6 It is a schematic diagram of the structure of the air pump part of the present invention;

[0026] Figure 7 It is a schematic diagram of the structure of the outer shell part of the present invention;

[0027] Figure 8 It is a schematic diagram of the internal structure of the housing of the present invention;

[0028] Fig. 9 It is a schematic diagram of the internal structure of the pressure relief pipe of the present invention.

[0029] Among them, 1. buffer barrel; 2. support foot; 3. fixing plate; 4. conveying assembly; 401. conveying pump; 402. air intake pipe; 403. drying box; 404. silica gel adsorption plate; 405. telescopic rod; 406. piston; 5. heating regeneration assembly; 501. heating box; 502. fan; 503. ceramic heater; 504. air guide pipe; 505. connecting plate; 506. circular shunt pipe; 6. mixing assembly; 601. air purifier; 602. air pump; 603. connecting pipe; 604. shunt pipe 1; 605. conveying pipe; 606 , nozzle; 607, spiral guide plate; 608, return pipe; 7, exhaust pipe; 8, voltage stabilizing assembly; 801, shell; 802, porous plate; 803, partition; 804, pressure sensor; 805, guide pipe; 806, control valve; 807, pressure relief pipe; 808, connecting block; 809, tension spring; 810, sealing block; 811, air outlet cover; 9, cooling assembly; 901, cooling jacket; 902, water inlet pipe; 903, drain pipe; 904, switch valve; 10, diesel engine body; 11, solenoid valve; 12, one-way valve. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Please refer to the attached Figure 1 - Attachment Figure 5 The embodiment of the present invention provides a gas fuel supply device for diesel engine testing, comprising: a buffer barrel 1, a support leg 2 is fixed to the lower surface of the buffer barrel 1, a fixing plate 3 is fixed to the outer wall of the support leg 2, an exhaust pipe 7 is penetrated on one side of the buffer barrel 1, an electromagnetic valve 11 is arranged inside the exhaust pipe 7, and a diesel engine body 10 is fixed to the port of the exhaust pipe 7; a conveying component 4, which is arranged on the fixing plate 3, the conveying component 4 comprises a conveying pump 401, an intake pipe 402 is fixed to the output end of the conveying pump 401, the lower surface of the conveying pump 401 is fixed to the upper surface of the fixing plate 3, the outer wall of the intake pipe 402 penetrates the bottom of the buffer barrel 1, a left-right symmetrical telescopic rod 405 is fixed to the bottom end of the intake pipe 402, a piston 406 is fixed to the driving end of the telescopic rod 405, the outer wall of the piston 406 is arranged at the port of the intake pipe 402, a drying box 403 is fixed to the upper end of the outer wall of the intake pipe 402, and a silica gel adsorption plate 404 symmetrical up and down is fixed inside the drying box 403; a heating regeneration component 5, which is arranged on the buffer The outer wall of the buffer barrel 1 is used to dry the silica gel adsorption plate 404; the mixing component 6 is arranged on the outer wall of the buffer barrel 1 and is used to mix the gas and air; the pressure stabilizing component 8 is arranged on the exhaust pipe 7 and is used to stabilize the pressure inside the exhaust pipe 7; the cooling component 9 is arranged on the outer wall of the exhaust pipe 7 and is used to cool the gas inside the exhaust pipe 7. The heating regeneration component 5 includes a heating box 501, the outer wall of the heating box 501 is fixed to the outer wall of the buffer barrel 1, and one side of the heating box 501 is penetrated A left-right symmetrical fan 502 is installed, a ceramic heater 503 is inserted through the top of the heating box 501, an air duct 504 is inserted through one side of the heating box 501, the outer wall of the air duct 504 passes through the outer wall of the drying box 403, a circular diverter pipe 506 is fixed to the end of the air duct 504, the outer wall of the circular diverter pipe 506 is arranged in the middle of the two silica gel adsorption plates 404, a connecting plate 505 is fixed to the outer wall of the circular diverter pipe 506, and the outer wall of the connecting plate 505 is fixed to the inner wall of the drying box 403.

[0032] Specifically, the delivery pump 401 is responsible for sucking in the gas and delivering it through the intake pipe 402, so that the gas can be preliminarily adjusted before entering the buffer barrel 1, ensuring the stability of the gas flow and reducing the problem of excessive flow rate or insufficient flow. The bottom end of the intake pipe 402 is provided with a telescopic rod 405, and its driving end is connected to the piston 406, which can further adjust the airflow to make the gas delivery more accurate. When the gas is not delivered, the telescopic rod 405 carries the piston 406 to seal the intake pipe 402 to prevent gas leakage. The upper end of the outer wall of the intake pipe 402 is connected to the drying box 403. A silica gel adsorption plate 404 is installed inside the drying box 403 to remove moisture from the fuel gas and prevent incomplete combustion, excessive emissions or corrosion of the engine system due to excessive moisture in the fuel gas during transportation. The heating box 501 of the heating and regeneration component 5 provides a heat source for the silica gel adsorption plate 404, generates high temperature through the ceramic heater 503, and drives the hot air circulation by the fan 502, so that the silica gel adsorption plate 404 can continuously and efficiently adsorb moisture and be regenerated in time after saturation, ensuring the long-term stable operation of the drying system and improving the quality of gas fuel.

[0033] Please refer to the attached Figure 6 - Attachment Fig. 9The mixing assembly 6 includes an air purifier 601, the outer wall of the air purifier 601 is fixed to the outer wall of the buffer barrel 1, an air pump 602 is fixed to the outer wall of the air purifier 601, a connecting pipe 603 is fixed to the output end of the air purifier 601, the end of the connecting pipe 603 is connected to the input end of the air pump 602, a shunt pipe 1 604 is fixed to the output end of the air pump 602, a plurality of delivery pipes 605 are penetrated through the outer wall of the shunt pipe 1 604, the outer walls of the delivery pipes 605 all penetrate the outer wall of the buffer barrel 1, and the delivery pipes 603 are connected to the input end of the air pump 602. 05 is fixed with a nozzle 606 at the end, a spiral guide plate 607 is fixed on the inner wall of the buffer barrel 1, a return pipe 608 is passed through the top of the buffer barrel 1, the other end of the return pipe 608 is fixed to the bottom of the buffer barrel 1, and a one-way valve 12 is provided inside the return pipe 608 and the air guide pipe 504. The pressure stabilizing component 8 includes a shell 801, the inner wall of the shell 801 is fixed to the outer wall of the exhaust pipe 7, a pressure sensor 804 is passed through one side of the shell 801, and a guide pipe 805 is passed through the top of the shell 801. A control valve 806 is arranged inside the pipe 805, the other end of the guide pipe 805 penetrates the bottom end of the shell 801, the pressure sensor 804 and the control valve 806 are electrically connected, a partition 803 is fixed inside the shell 801, a porous plate 802 is fixed on the lower surface of the partition 803, the outer wall of the porous plate 802 is arranged on one side of the end of the exhaust pipe 7, a pressure relief pipe 807 is penetrated by the inner wall of the partition 803, a connecting block 808 is fixed inside the pressure relief pipe 807, and a tension spring 808 is fixed on the upper surface of the connecting block 808. 09, and a sealing block 810 is fixed to one end of the tension spring 809. The outer wall of the sealing block 810 slides on the top of the pressure relief pipe 807. An air outlet cover 811 is fixed to the top of the sealing block 810. The cooling assembly 9 includes a cooling jacket 901. The inner wall of the cooling jacket 901 is fixed to the outer wall of the exhaust pipe 7. A water inlet pipe 902 runs through one side of the cooling jacket 901. A drain pipe 903 runs through one side of the cooling jacket 901. Switch valves 904 are provided inside the water inlet pipe 902 and the drain pipe 903.

[0034] Specifically, the air pump 602 drives the air flow and delivers the purified air to the diversion pipe 604, and the air is evenly distributed to the inside of the buffer barrel 1 through multiple delivery pipes 605. The design of the nozzle 606 ensures that the air is sprayed into the buffer barrel 1 with appropriate pressure and flow, thereby improving the mixing uniformity of the gas and air. The spiral guide plate 607 effectively guides the airflow to form an orderly airflow path in the buffer barrel 1 to avoid airflow instability or vortex phenomena, thereby improving the mixing efficiency of the gas and air. The return pipe 608 is connected to the air guide pipe 504 to play the role of gas reflux, ensuring that the gas in the system is always in a circulating state, further improving the mixing effect, and the one-way valve 12 set in the return pipe 608 and the air guide pipe 504 can prevent the gas from flowing back, thereby ensuring the safety and stability of the system.

[0035] The pressure sensor 804 in the housing 801 can accurately measure pressure changes and transmit data to the control valve 806 to adjust the gas flow and ensure the stability of gas supply. The porous plate 802 on the partition 803 plays a role in uniform pressure to prevent the gas pressure in the exhaust pipe 7 from being too high or too low. The sealing block 810 slides during pressure relief to open the gas outlet cover 811 to ensure that excess gas is discharged smoothly, prevent equipment overload, and improve the safety of the system.

[0036] The temperature of the gas in the exhaust pipe 7 is controlled by the cooling jacket 901 to keep the gas within a suitable temperature range to avoid damage to the system caused by high temperature. The setting of the water inlet pipe 902 and the drain pipe 903 enables the cooling jacket 901 to perform water circulation cooling to ensure cooling efficiency, avoid excessive temperature affecting combustion efficiency or causing system failure, and ensure stable operation of the engine during the test.

[0037] Working principle: First, the gas is transported through the delivery pump 401 in the delivery component 4, enters the intake pipe 402, and passes through the pipeline to the buffer barrel 1. The telescopic rod 405 and the piston 406 at the bottom of the intake pipe 402 adjust the gas flow to ensure the stability of the gas flow. The silica gel adsorption plate 404 in the drying box 403 dries the gas to remove moisture in the gas to prevent excessive moisture from affecting the stability and combustion effect of the mixed gas. After drying, the gas enters the heating regeneration component 5 through the air guide pipe 504, wherein the ceramic heater 503 in the heating box 501 provides heat, activates the fan 502 to accelerate the airflow, and helps the moisture adsorbed by the silica gel adsorption plate 404 to evaporate, thereby regenerating the drying function.

[0038] Next, the dried gas enters the mixing assembly 6, and enters the diverter pipe 604 through the connecting pipe 603 through the output of the air pump 602, and is fully mixed with the air through multiple delivery pipes 605 in the buffer barrel 1 to ensure the uniformity of the mixing of the gas and air. Under the action of the spiral guide plate 607, the airflow forms a flow path, so that the gas and air are well and evenly mixed, ensuring that the mixing ratio is suitable for subsequent combustion.

[0039] The mixed gas and air enter the exhaust pipe 7 and further pass through the pressure stabilizing component 8. When the pressure inside the shell 801 is too high, the gas will enter the inside of the pressure relief pipe 807 and exert a force to move the connecting block 808 upward, thereby compressing the tension spring 809 and pushing the sealing block 810 upward. As the sealing block 810 moves upward, the gas outlet cover 811 opens, and the gas is discharged through the pressure relief pipe 807, enters the top of the partition 803, and finally flows into the top connection of the guide pipe 805. The excess gas is released, avoiding the excessive pressure inside the exhaust pipe 7 to affect the operation of the engine. The pressure sensor 804 in the shell 801 monitors the gas pressure in real time and adjusts the gas flow through the control valve 806 to ensure the stability of the pressure in the exhaust pipe 7 and prevent pressure fluctuations from affecting the engine. The cooling jacket 901 further reduces the temperature of the gas in the exhaust pipe 7 through the cooling effect of the water flow, ensuring that the temperature of the gas entering the diesel engine is appropriate and improving the combustion efficiency.

[0040] Finally, the stable airflow and uniform mixed gas are delivered to the diesel engine body 10 through the exhaust pipe 7 and controlled by the solenoid valve 11 .

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gas fuel supply device for diesel engine testing, characterized in that: include: A buffer barrel (1), wherein a support foot (2) is fixed to the lower surface of the buffer barrel (1), a fixing plate (3) is fixed to the outer wall of the support foot (2), an exhaust pipe (7) passes through one side of the buffer barrel (1), a solenoid valve (11) is arranged inside the exhaust pipe (7), and a diesel engine body (10) is fixed to the port of the exhaust pipe (7); A conveying assembly (4) is arranged on the fixed plate (3), the conveying assembly (4) comprising a conveying pump (401), an air intake pipe (402) is fixed to the output end of the conveying pump (401), the lower surface of the conveying pump (401) is fixed to the upper surface of the fixed plate (3), the outer wall of the air intake pipe (402) passes through the bottom of the buffer barrel (1), a left-right symmetrical telescopic rod (405) is fixed to the bottom end of the air intake pipe (402), a piston (406) is fixed to the driving end of the telescopic rod (405), the outer wall of the piston (406) is arranged at the port of the air intake pipe (402), a drying box (403) is fixed to the upper end of the outer wall of the air intake pipe (402), and a silica gel adsorption plate (404) is fixed to the inside of the drying box (403) which is symmetrical up and down; A heating regeneration component (5) is arranged on the outer wall of the buffer barrel (1) and is used to dry the silica gel adsorption plate (404); A mixing assembly (6), which is arranged on the outer wall of the buffer barrel (1) and is used to mix the fuel gas and the air; A pressure stabilizing component (8), which is arranged on the exhaust pipe (7) and is used to stabilize the pressure inside the exhaust pipe (7); A cooling component (9) is arranged on the outer wall of the exhaust pipe (7) and is used to cool the combustion gas inside the exhaust pipe (7).

2. A gas fuel supply device for diesel engine testing according to claim 1, characterized in that: The heating regeneration component (5) comprises a heating box (501), the outer wall of the heating box (501) is fixed to the outer wall of the buffer barrel (1), a left-right symmetrical fan (502) is passed through one side of the heating box (501), and a ceramic heater (503) is passed through the top of the heating box (501).

3. A gas fuel supply device for diesel engine testing according to claim 2, characterized in that: An air duct (504) passes through one side of the heating box (501), and the outer wall of the air duct (504) passes through the outer wall of the drying box (403). A circular diverter tube (506) is fixed to the end of the air duct (504), and the outer wall of the circular diverter tube (506) is arranged in the middle of two silica gel adsorption plates (404). A connecting plate (505) is fixed to the outer wall of the circular diverter tube (506), and the outer wall of the connecting plate (505) is fixed to the inner wall of the drying box (403).

4. A gas fuel supply device for diesel engine testing according to claim 1, characterized in that: The mixing assembly (6) comprises an air purifier (601), the outer wall of the air purifier (601) is fixed to the outer wall of the buffer barrel (1), an air pump (602) is fixed to the outer wall of the air purifier (601), a connecting pipe (603) is fixed to the output end of the air purifier (601), the end of the connecting pipe (603) is connected to the input end of the air pump (602), and a shunt pipe 1 (604) is fixed to the output end of the air pump (602).

5. A gas fuel supply device for diesel engine testing according to claim 4, characterized in that: The outer wall of the diverter pipe 1 (604) is penetrated by a plurality of delivery pipes (605), the outer walls of the delivery pipes (605) all penetrate the outer wall of the buffer barrel (1), the ends of the delivery pipes (605) are fixed with nozzles (606), the inner wall of the buffer barrel (1) is fixed with a spiral guide plate (607), the top end of the buffer barrel (1) is penetrated by a return pipe (608), the other end of the return pipe (608) is fixed to the bottom end of the buffer barrel (1), and the return pipe (608) and the air guide pipe (504) are both provided with one-way valves (12) inside.

6. A gas fuel supply device for diesel engine testing according to claim 1, characterized in that: The voltage stabilizing component (8) comprises a shell (801), the inner wall of the shell (801) is fixed to the outer wall of the exhaust pipe (7), a pressure sensor (804) is passed through one side of the shell (801), a flow guide tube (805) is passed through the top of the shell (801), a control valve (806) is arranged inside the flow guide tube (805), and the other end of the flow guide tube (805) passes through the bottom end of the shell (801), and the pressure sensor (804) and the control valve (806) are electrically connected.

7. A gas fuel supply device for diesel engine testing according to claim 6, characterized in that: A partition (803) is fixed inside the shell (801), a porous plate (802) is fixed on the lower surface of the partition (803), an outer wall of the porous plate (802) is arranged on one side of the end of the exhaust pipe (7), and a pressure relief pipe (807) penetrates the inner wall of the partition (803).

8. A gas fuel supply device for diesel engine testing according to claim 7, characterized in that: A connecting block (808) is fixed inside the pressure relief pipe (807), one end of a tension spring (809) is fixed on the upper surface of the connecting block (808), a sealing block (810) is fixed on the other end of the tension spring (809), the outer wall of the sealing block (810) slides on the top end of the pressure relief pipe (807), and an air outlet cover (811) is fixed on the top end of the sealing block (810).

9. A gas fuel supply device for diesel engine testing according to claim 1, characterized in that: The cooling assembly (9) comprises a cooling jacket (901), the inner wall of the cooling jacket (901) being fixed to the outer wall of the exhaust pipe (7).

10. A gas fuel supply device for diesel engine testing according to claim 9, characterized in that: A water inlet pipe (902) passes through one side of the cooling jacket (901), and a drainage pipe (903) passes through one side of the cooling jacket (901). Switch valves (904) are provided inside the water inlet pipe (902) and the drainage pipe (903).

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