Gas engine air supply system

Abstract

The present invention belongs to the technical field of gas engines, and specifically provides a gas engine gas supply system, including a gas storage tank, which is connected to a mixer through a gas pump, a first-level pressure reducing valve and a second-level pressure reducing valve are sequentially arranged on the gas intake pipeline, the gas intake pipeline is connected to the mixer through a gas inlet connector, the gas inlet connector includes a first connector and a second connector, the first connector and the second connector are flexibly connected through a buffer spring, the first connector is provided with a gas reflux part connected to the internal gas intake part thereof, the gas reflux part is provided with a reflux solenoid valve, the diameter of the gas reflux part is gradually increased and connected to the gas storage tank through the reflux pipeline, a reflux check valve is arranged on the gas reflux pipeline and a reflux boosting valve is connected in parallel; the air inlet of the mixer is connected to the atmosphere through the air intake pipeline, the mixer is connected to the engine through the engine intake pipeline, the engine intake pipeline passes through the interior of a water cooling box, the above can realize the reflux of unmixed gas.

Description

Technical Field

[0001] The present invention relates to the technical field of gas engines, and in particular to a gas engine air supply system. Background Art

[0002] The engine air supply system, also commonly referred to as the engine intake system, is an important part of the engine. It is responsible for supplying gas (such as natural gas, liquefied petroleum gas, etc.) to the engine for combustion to generate power. However, the gas cannot enter the engine directly for combustion. It needs to be mixed with air in the mixer before entering the engine. When a serious engine failure occurs, in order not to affect the normal operation of the vehicle system and stop the vehicle in a dangerous position, the mixed gas in the mixer will continue to be supplied to the engine for combustion, but the gas in the gas pipeline will stop entering the mixer.

[0003] In current engines, the unmixed combustion fuel gas in the gas pipeline is usually processed through a three-way catalytic converter and an exhaust gas recirculation system to reduce the emission of harmful substances inside it. However, when an engine malfunctions, these emission control systems may be affected, resulting in reduced emission performance and more fuel gas loss. Summary of the invention

[0004] In view of the above-mentioned defects, the present invention provides a gas engine air supply system capable of realizing the reflow of unmixed fuel gas.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a gas engine gas supply system, comprising a gas storage tank, a gas pump is provided at the gas outlet of the gas storage tank, the output end of the gas pump is connected to the mixer through a gas intake pipeline, a primary pressure reducing valve and a secondary pressure reducing valve are sequentially provided on the gas intake pipeline, the gas intake pipeline is connected to the mixer through a gas inlet connector, the gas inlet connector comprises a first connector and a second connector, the first connector is connected to the gas intake pipeline, one end of the second connector is fixedly connected to the gas inlet of the mixer through a fixed thread, the first connector and the second connector are flexibly connected through a buffer spring, the first connector is provided with a gas reflux part connected to the internal gas intake part thereof, a reflux solenoid valve is provided at the connection between the gas reflux part and the gas intake part, the pipe diameter at the connection between the gas reflux part and the gas intake part is smaller than the pipe diameter of the gas intake part, the pipe diameter at the rear end of the gas reflux part gradually increases and is connected to the gas storage tank through the gas reflux pipeline, a reflux check valve is provided on the gas reflux pipeline, a branch is provided at the reflux check valve in parallel with a reflux booster valve;

[0006] The air inlet of the mixer is connected to the atmosphere through an air intake pipeline provided with a first electronic throttle body, and the mixer is connected to the engine through an engine intake pipeline provided with a second electronic throttle body, and the engine intake pipeline passes through the interior of the water cooling box.

[0007] As a further improvement of the present invention, a truncated cone-shaped locking portion is provided on one side of the first joint close to the second joint, a locking groove is provided inside the locking portion, a plurality of buffer springs in a circular array are fixedly installed inside the locking groove, a locking ball is fixedly connected to the end of the buffer spring, and the second joint is provided with a matching platform that matches inside the locking groove, and the matching platform is provided with slot holes that are the same number as the buffer springs.

[0008] As a further improvement of the present invention, a gap of 8-10 mm is left along the radial direction at the outer edge of the connection between the second joint and the first joint.

[0009] As a further improvement of the present invention, an air filter is provided at the end of the air intake pipeline, and an air pressure flow sensor is provided at the connection point between the air intake pipeline and the mixer.

[0010] As a further improvement of the present invention, a first safety valve is provided between the first pressure reducing valve and the second pressure reducing valve on the gas intake pipeline, and a gas shut-off valve is provided behind the second pressure reducing valve on the gas intake pipeline.

[0011] As a further improvement of the present invention, a gas pressure and temperature sensor is provided behind the gas shut-off valve on the gas inlet pipeline.

[0012] As a further improvement of the present invention, a second safety valve is provided between the reflux booster valve and the gas storage tank on the gas reflux pipeline.

[0013] As a further improvement of the present invention, the gas return part is composed of a vertical section, a bent section, and a horizontal section. The diameters of the vertical section and the bent section are smaller than the diameter of the gas intake section. The diameters of the bent section to the horizontal section are opened and gradually increase. The horizontal section is connected to the gas return pipeline.

[0014] As a further improvement of the present invention, the gas intake pipeline is an aluminum alloy hard pipe, and the air intake pipeline is a single-wall corrugated pipe.

[0015] As a further improvement of the present invention, a sealing ring is provided at the connection between the first joint and the second joint.

[0016] Beneficial effects of the present invention:

[0017] 1. By providing a gas inlet connector with a gas reflux portion, the unmixed gas in the gas inlet pipeline can be refluxed into the gas storage tank through the gas reflux pipeline. The gas reflux pipeline is provided with a reflux booster valve to boost the gas pressure, ensuring that the gas can fully reflux into the gas storage tank and remain stable.

[0018] 2. By reducing the diameter of the gas reflux part, a diameter difference is formed between the gas reflux part and the gas inlet part. When the reflux check valve is opened, the gas enters the gas reflux part. Since the diameter of the gas reflux part is small, the flow rate of the gas is further increased, so that the gas in the gas inlet pipeline can flow out quickly. The diameter of the rear end of the gas reflux part is gradually increased to the original diameter, ensuring that the gas flow rate can be guaranteed when the gas flow rate increases, and accelerating the discharge of gas from the gas inlet pipeline.

[0019] 3. Set the gas inlet connector as a first connector and a second connector, match the first connector and the second connector, then set a buffer spring between the two, and fix them together through a snap ball and a slot hole to ensure that the two will not rotate. At the same time, leave a certain gap between the two. When the engine starts and vibrates, the buffer spring can be used for buffering to prevent the first connector connected to the aluminum alloy hard pipe gas intake pipe from vibrating, prevent the gas intake pipe from being damaged due to long-term use, and ensure the stability of gas transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of a gas supply system for a gas engine of the present invention;

[0021] Figure 2 This is the axonometric view of the gas inlet connection head;

[0022] Figure 3 It is the axonometric view of the second joint;

[0023] Figure 4 This is a schematic diagram of the structure of the gas inlet connector;

[0024] Figure 5 yes Figure 4 Enlarged schematic diagram of part A in the middle.

[0025] In the figure: 1-gas storage tank, 2-gas intake solenoid valve, 3-gas filter, 4-gas pump, 5-second safety valve, 6-backflow boost valve, 7-backflow check valve, 8-first level pressure reducing valve, 9-first safety valve, 10-second level pressure reducing valve, 11-gas stop valve, 12-gas pressure and temperature sensor, 13-backflow solenoid valve;

[0026] 14-gas inlet connector, 1400-first connector, 1401-second connector, 1402-clamping portion, 1403-fixing thread, 1404-gas inlet portion, 1405-gas return portion, 1406-matching platform, 1407-slot hole, 1408-vertical section, 1409-bending section, 1410-horizontal section, 1411-buffer spring, 1412-clamping ball, 1413-clamping groove, 1414-sealing ring;

[0027] 15-mixer, 16-cold water tank, 17-second electronic throttle body, 18-engine, 19-air filter, 20-first electronic throttle body, 21-ECU, 22-air pressure flow sensor. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific examples described herein are only used to explain the present invention and are not intended to limit the present invention. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only referenced to the directions of the accompanying drawings. Therefore, the directional terms used are used to illustrate and are not used to limit the present invention. In addition, in all embodiments, the same figure numerals represent the same elements.

[0029] See also Figures 1 to 5 The present invention provides a gas engine air supply system, including a gas pipeline and an air pipeline, both of which are connected to a mixer 15, wherein the gas pipeline uses an aluminum alloy hard pipe, and the air pipeline uses a flexible single-wall corrugated pipe.

[0030] As a further explanation of this embodiment, the use of aluminum alloy hard pipes for the gas pipeline helps to ensure the stability of gas transportation and prevent abnormalities in the gas pipeline from causing danger.

[0031] The gas pipeline includes a gas storage tank 1, in which the gas required by the engine 18 is stored. A gas intake solenoid valve 2 is provided at the gas outlet of the gas storage tank 1, and the gas intake solenoid valve 2 is electrically connected to the ECU 21. The gas outlet of the gas storage tank 1 is connected to the intake end of the gas pump 4, and a gas filter 3 is provided between the gas storage tank 1 and the gas pump 4. The gas outlet of the gas pump 4 is connected to the gas intake of the mixer 15 through the gas intake pipeline.

[0032] A primary pressure reducing valve 8 is provided on the gas intake pipeline on the side close to the gas pump 4, a first safety valve 9 is provided on the gas intake pipeline on the side away from the gas pump 4, a secondary pressure reducing valve 10 is provided on the gas intake pipeline on the side away from the primary pressure reducing valve 8, a gas stop valve 11 is provided on the gas intake pipeline on the side away from the first safety valve 9, and a gas pressure and temperature sensor 12 is provided on the gas intake pipeline on the side close to the mixer 15. The primary pressure reducing valve 8, the secondary pressure reducing valve 10, and the gas pressure and temperature sensor 12 are all electrically connected to the ECU 21.

[0033] As a further explanation of this embodiment, high-pressure gas is stored in the gas storage tank 1, which is transported to the gas intake pipeline through the gas pump 4 and filtered through the gas filter 3, and then reduced in pressure in stages through the first-level pressure reducing valve 8 and the second-level pressure reducing valve 10. Since the initial pressure reduction pressure of the first-level pressure reducing valve 8 is relatively high, a first safety valve 9 is provided which automatically opens when the system pressure exceeds the set value to release excess pressure to protect the gas intake pipeline system.

[0034] The gas inlet pipeline is connected and fixed to the gas inlet of the mixer 15 through the gas inlet connector 14. The gas inlet connector 14 includes a first connector 1400 and a second connector 1401. One end of the second connector 1401 is provided with a fixing thread 1403. The second connector 1401 is installed and fixed to the gas inlet of the mixer 15 through the fixing thread 1403. The end of the second connector 1401 away from the fixing thread 1403 is a truncated cone-shaped matching platform 1406. A plurality of semicircular slots 1407 are provided along the ring circumference of the matching platform 1406. The slots 1407 are arranged in a circular array along the ring circumference of the matching platform 1406.

[0035] The first joint 1400 includes a gas inlet 1404, one end of which is provided with a truncated cone-shaped engaging portion 1402, an annular engaging groove 1413 is provided inside the engaging portion 1402, and the inner diameter of the annular engaging groove 1413 is larger than the outer diameter of the annular matching platform 1406. A plurality of buffer springs 1411 are fixedly connected inside the engaging groove 1413, the number of the buffer springs 1411 is the same as the number of the slots 1407, the buffer springs 1411 are arranged in a circumferential array along the inside of the engaging groove 1413, and one end of the buffer spring 1411 is fixedly connected to an engaging ball 1412. The matching platform 1406 of the second joint 1401 is installed inside the engaging groove 1413, and the engaging ball 1412 in the engaging groove 1413 matches the slots 1407 on the matching platform 1406. A gap of 8-10 mm is left between the engaging portion 1402 of the first joint 1400 and the outer edge of the second joint 1401 in the radial direction. A sealing ring 1414 is provided at the connection between the first joint 1400 and the second joint 1401 .

[0036] As a further explanation of this embodiment, the engine 18 will vibrate during operation, and the gas inlet connector 14 will move relative to the fixed pipe installed. If a rigid connection is used at this connection, the delivery pipeline itself will be forced to withstand vibration, which may cause metal fatigue damage and lead to leakage of combustible gas. The vibration mainly occurs on one side of the mixer 15. When the engine 18 drives the mixer 15 to vibrate, the second joint 1401 directly connected to the mixer 15 vibrates accordingly. Since a buffer spring 1411 is provided between the second joint 1401 and the first joint 1400 and they are fixed together by a snap-fit ​​ball 1412, the buffer spring 1411 will be compressed when the second joint 1401 is offset due to vibration, causing the buffer spring 1411 to deform, and then the buffer spring 1411 will restore its initial position through the elastic force of the buffer spring 1411, and the first joint 1400 will not be offset or vibrated, thereby making the gas pipeline stable without relative movement. A certain gap is left between the outer edges of the second joint 1401 and the first joint 1400 in the radial direction, so that the second joint 1401 has sufficient vibration buffering space and will not directly collide with or impact the first joint 1400.

[0037] A gas return portion 1405 is provided below the gas inlet portion 1404 of the first joint 1400. The gas return portion 1405 is connected to the inside of the gas inlet portion 1404. A return solenoid valve 13 is provided at the connection between the gas return portion 1405 and the gas inlet portion 1404. The return solenoid valve 13 is electrically connected to the ECU 21. The gas return portion 1405 is bent from the vertical direction to the horizontal direction. The inner diameter of the vertical section 1408 of the gas return portion 1405 is equal to the inner diameter of the bent section 1409 of the gas return portion 1405, and both are smaller than the inner diameter of the pipeline of the gas inlet portion 1404. The diameter of the gas return portion 1405 gradually increases from the bent section 1409 to the horizontal section 1410, and the diameter of the horizontal section 1410 of the gas return portion 1405 is consistent with the diameter of the gas inlet portion 1404. The gas return portion 1405 is connected to the gas storage tank 1 through the gas return pipeline.

[0038] As a further explanation of this embodiment, when a problem occurs with the engine 18, the mixer 15 is controlled to cut off the connection with the gas pipeline, and the reflux solenoid valve 13 is opened, and the gas in the gas intake pipeline enters the gas inlet connector 14, and enters the gas reflux portion 1405 from the gas intake portion 1404 of the first joint 1400. Since the diameters of the vertical section 1408 and the bent section 1409 of the gas reflux portion 1405 are relatively small, the flow rate of the gas flowing through here will increase, thereby accelerating the outflow of the gas in the gas intake pipeline, and then the diameter of the gas reflux portion 1405 from the bent section 1409 to the horizontal section 1410 is gradually increased, thereby ensuring the stability of the gas flow rate, and the gas flows back from the gas reflux pipeline to the gas storage tank 1.

[0039] A reflux check valve 7 is provided on the side of the gas reflux pipeline close to the gas inlet connector 14, and a reflux booster valve 6 is connected in parallel to the reflux check valve 7. A second safety valve 5 is provided on the gas reflux pipeline on the side of the reflux check valve 7 away from the gas inlet connector 14.

[0040] As a further explanation of this embodiment, by arranging the reflux boost valve 6 and the reflux check valve 7 in parallel, the time for filling the gas tank can be shortened, and at the same time the pressure can be increased to ensure sufficient entry of the gas.

[0041] The air pipeline includes an air filter 19, which is connected to the external atmosphere. An air outlet is provided at one end of the air filter 19. The air filter 19 is connected to the air inlet of the mixer 15 through an air intake pipeline. A first electronic throttle body 20 is provided on the air intake pipeline. An air pressure flow sensor 22 is provided at the connection point between the air intake pipeline and the mixer 15. The first electronic throttle body 20 and the air pressure flow sensor 22 are both electrically connected to the ECU 21.

[0042] As a further explanation of this embodiment, the intake amount of air entering the mixer 15 from the air line can be adjusted by the first electronic throttle body 20 .

[0043] The air outlet of the mixer 15 is connected to the engine 18 through the engine intake pipeline. The engine 18 intake pipeline first enters the cold water tank 16. A second electronic throttle body 17 is provided on the side of the engine intake pipeline close to the engine 18. The second electronic throttle body 17 is electrically connected to the ECU 21. The end of the engine intake pipeline is connected to the engine intake pipe. The engine intake pipe has 6 air outlets connected to the six cylinders of the engine 18.

[0044] As a further explanation of this embodiment, the cooling density of the mixed gas can be increased by the cold water tank 16 , and the intake amount of the mixed gas in the engine 18 can be adjusted by the second electronic throttle body 17 .

[0045] The working principle and use process of this embodiment:

[0046] When the engine 18 needs to be supplied with gas, the gas intake solenoid valve 2 is opened and the gas pump 4 is started. The gas enters the gas filter 3 from the gas storage tank 1 for filtration, and then enters the gas intake pipeline through the gas pump 4. It is reduced in pressure by the first-level pressure reducing valve 8 and the second-level pressure reducing valve 10 and enters the mixer 15, and is mixed with the air filtered by the air filter 19 in the mixer 15. Then the mixed gas enters the engine intake pipeline, is cooled by the cold water tank 16 to increase the density, and then enters the engine 18. This process can control the second electronic throttle body 17 through the ECU21 to adjust the intake amount of the mixed gas entering the engine 18.

[0047] When the engine 18 fails, it is necessary to promptly block the gas input into the engine 18, close the gas intake solenoid valve 2 through ECU 21, close the gas intake port of the mixer 15, start the reflux solenoid valve 13 of the gas inlet connector 14, and then push the gas in the gas intake pipeline into the gas inlet connector 14 through the gas pump 4. The gas is quickly discharged from the gas intake part 1404 of the gas inlet connector 14 to the gas reflux part 1405, and then enters the gas reflux pipeline, and the gas is pressurized by the reflux booster valve 6, and then enters the gas storage tank 1.

[0048] The above are only preferred implementations of the present invention. The protection scope of the present invention is not limited to the above implementation measures. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A gas engine air supply system, characterized in that: The invention comprises a gas storage tank (1), wherein a gas pump (4) is provided at a gas outlet of the gas storage tank (1), wherein an output end of the gas pump (4) is connected to a mixer (15) via a gas intake pipeline, wherein a primary pressure reducing valve (8) and a secondary pressure reducing valve (10) are provided on the gas intake pipeline in sequence, wherein the gas intake pipeline is connected to the mixer (15) via a gas inlet connector (14), wherein the gas inlet connector (14) comprises a first connector (1400) and a second connector (1401), wherein the first connector (1400) is connected to the gas intake pipeline, wherein one end of the second connector (1401) is fixedly connected to the gas inlet of the mixer (15) via a fixing thread (1403), wherein the first connector (1400) is connected to the second connector (1401), wherein ... connected to the gas inlet of the mixer (15) via a fixing thread (1403), wherein the first connector (1400) is connected to the second connector (1401), wherein the second connector (1401) is connected to the gas inlet of the mixer (15) via a fixing thread (1403), wherein the first connector (1400) is connected to the second connector (1401), wherein the second connector (1 The joints (1401) are flexibly connected via a buffer spring (1411); the first joint (1400) is provided with a gas return portion (1405) connected to a gas inlet portion (1404) therein; a return solenoid valve (13) is provided at the connection between the gas return portion (1405) and the gas inlet portion (1404); the pipe diameter at the connection between the gas return portion (1405) and the gas inlet portion (1404) is smaller than the pipe diameter of the gas inlet portion (1404); the pipe diameter at the rear end of the gas return portion (1405) gradually increases and is connected to the gas storage tank (1) via a gas return pipeline; a return check valve (7) is provided on the gas return pipeline; a branch is provided at the return check valve (7) and a return booster valve (6) is connected in parallel; The air intake port of the mixer (15) is connected to the atmosphere via an air intake pipeline provided with a first electronic throttle body (20), and the mixer (15) is connected to the engine (18) via an engine intake pipeline provided with a second electronic throttle body (17), wherein the engine intake pipeline passes through the interior of the water cooling box.

2. The gas engine air supply system according to claim 1, characterized in that: A truncated cone-shaped engaging portion (1402) is provided on one side of the first joint (1400) close to the second joint (1401); an engaging groove (1413) is provided inside the engaging portion (1402); a plurality of buffer springs (1411) arranged in a circular array are fixedly installed inside the engaging groove (1413); an engaging ball (1412) is fixedly connected to the end of the buffer spring (1411); the second joint (1401) is provided with a matching platform (1406) matched inside the matching groove (1413); the matching platform (1406) is provided with slot holes (1407) having the same number as the buffer springs (1411); and the engaging ball (1412) is matched in the slot holes (1407).

3. The gas engine air supply system according to claim 2, characterized in that: A gap of 8-10 mm is left at the outer edge of the connection between the second joint (1401) and the first joint (1400) in the radial direction.

4. The gas engine air supply system according to claim 1, characterized in that: An air filter (19) is provided at the end of the air intake pipeline, and an air pressure flow sensor (22) is provided at the connection point between the air intake pipeline and the mixer (15).

5. The gas engine air supply system according to claim 1, characterized in that: A first safety valve (9) is provided between the first pressure reducing valve (8) and the second pressure reducing valve (10) on the gas intake pipeline, and a gas stop valve (11) is provided behind the second pressure reducing valve (10) on the gas intake pipeline.

6. The gas engine air supply system according to claim 5, characterized in that: A gas pressure and temperature sensor (12) is provided behind the gas shut-off valve (11) on the gas inlet pipeline.

7. The gas engine air supply system according to claim 1, characterized in that: A second safety valve (5) is provided between the return pressure boosting valve (6) and the gas storage tank (1) on the gas return pipeline.

8. The gas engine air supply system according to claim 1, characterized in that: The gas return section (1405) is divided into a vertical section (1408), a bent section (1409), and a horizontal section (1410); the pipe diameters of the vertical section (1408) and the bent section (1409) are smaller than the pipe diameter of the gas inlet section (1404); the pipe diameters from the bent section (1409) to the horizontal section (1410) are opened and gradually increase; and the horizontal section (1410) is connected to the gas return pipeline.

9. The gas engine air supply system according to claim 1, characterized in that: The gas intake pipeline is an aluminum alloy hard pipe, and the air intake pipeline is a single-wall corrugated pipe.

10. The gas engine air supply system according to claim 1, characterized in that: A sealing ring (1414) is provided at the connection between the first joint (1400) and the second joint (1401).

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