CN202832864U - Low-pressure gas appliance of gas engine - Google Patents

Abstract

The utility model belongs to the technical field of gas engines, in particular to a low-pressure gas device for a gas engine. The utility model includes a two-way pressure regulator and a proportional mixing regulator. The two-way pressure regulator includes an air cavity and a gas cavity. A diaphragm is arranged between the air cavity and the gas cavity to maintain air pressure balance. The middle part of the diaphragm is fixed with an upper and lower A moving adjusting rod, the adjusting rod runs through the entire air chamber and the gas chamber, the top of the air chamber is provided with an air filter device, the lower end of the gas chamber is connected to a gas hood, and the gas hood is provided with a gas inlet; the proportional mixing The regulator includes a mixing chamber, which is connected to the outlet of the mixed gas and the gas mixing ratio adjustment knob. The side wall of the mixing chamber is provided with an air inlet a and an air inlet b, which are respectively connected to the air chamber and the gas chamber. The outer surface of the mixing chamber is provided with There is a square body, the square body is connected to the square cover, and the side wall of the air inlet a connected to the air chamber is provided with an air passage, and the air passage is connected to the compensation chamber surrounded by the square body and the outer surface of the mixing chamber.

Description

Gas engine low pressure gas device

technical field

The utility model belongs to the technical field of gas engines, in particular to a low-pressure gas device for a gas engine.

Background technique

The gas device of the existing gas engine is generally composed of a decompression regulator and a mixer (Venturi or proportional type). This kind of gas device can be compared with the air in a relatively accurate ratio after the gas with a stable pressure is decompressed and stabilized. Mixing, the gas concentration remains basically unchanged, which can provide a relatively stable mixture for the engine. However, for unstable gas (pressure fluctuations, intermittent gas supply) whose pressure is lower than atmospheric pressure (for example: oil field associated gas, biogas, gas gas, etc.), due to the characteristics of unstable gas supply of low-pressure gas, the gas mixed with it The air must constantly change and adjust as the pressure changes. The existing gas device cannot guarantee the stable gas concentration of the mixed gas, which causes the gas engine to fail to work normally. This technical problem causes low-pressure unstable gas (such as oilfield associated gas, biogas, gas, etc.), which cannot be used to generate power or electricity for the engine, resulting in a large waste of unstable low-pressure gas. According to incomplete statistics, the wasted funds of associated gas alone in the whole country amounted to more than 30 billion yuan.

Utility model content

The utility model provides a low-pressure gas device for a gas engine, which can solve the problem of wasting low-pressure unstable gas, stabilize the pressure of the unstable gas, and apply it to the gas engine to generate power or electricity after being mixed. the

In order to solve the above-mentioned technical problems, the utility model provides the following technical solutions: a gas engine low-pressure gas device, including a bidirectional pressure regulator and a proportional mixing regulator, the bidirectional pressure regulator includes an air chamber and a gas chamber, and a gas chamber is provided between the air chamber and the gas chamber. There is a diaphragm to isolate and maintain the air pressure balance. The middle part of the diaphragm is fixed with an adjustment rod that moves up and down. The adjustment rod runs through the entire air chamber and gas chamber. The top of the air chamber is equipped with an air filter device. The gas chamber The lower end is connected to the gas hood, the gas hood is provided with a gas inlet, the proportional mixing regulator includes a mixing chamber, the mixing chamber is connected to the outlet of the mixed gas and the gas mixing ratio adjustment knob, and the side wall of the mixing chamber is provided with an air inlet a, an inlet The air port b is connected to the air chamber and the gas chamber respectively. The outer surface of the mixing chamber is provided with a square body, which is connected to the square cover. The side wall of the air inlet a connected to the air chamber is provided with an air passage, and the air passage is connected to In the compensation chamber surrounded by the inner surface of the cube, the outer surface of the mixing chamber and the inner surface of the square cover.

Adopting the above-mentioned technical scheme, in the utility model, the gas below the atmospheric pressure is firstly adjusted by a two-way pressure regulator to adjust the air pressure, and then passed into the proportional mixing regulator for proportional mixing of air and gas; wherein the two-way pressure regulator includes an air chamber There is a diaphragm between the air chamber and the gas chamber to isolate and maintain the air pressure balance. The diaphragm is used to completely separate the air chamber and the gas chamber. The middle part of the diaphragm is fixed with an adjustment rod that moves up and down, and the adjustment rod runs through the The entire air chamber and gas chamber, so that the entire diaphragm can move up and down together with the adjustment rod, and the adjustment rod can adjust the air pressure changes of the two chambers by moving up and down. Push the diaphragm to move down together with the adjustment rod, so that the upper end of the adjustment rod will become smaller, and the air will enter less, and the air pressure will also decrease accordingly. At the same time, the lower end of the adjustment rod will become larger, and the gas intake The volume will increase, and the pressure will also rise. In the process of ebb and flow, the pressure of the two chambers will eventually be balanced; the top of the air chamber is equipped with an air filter device, which can filter the air entering the air chamber. The lower end of the gas cavity is connected to a gas cover, and the gas cover is provided with a gas inlet through which the gas enters the gas cavity. The proportional mixing regulator includes a mixing chamber, and the side wall of the mixing chamber is provided with an air inlet a and an air inlet b, which are respectively connected to the air chamber and the gas chamber, so that the stabilized gas can be passed into the mixing chamber, Use the gas mixing ratio adjustment knob to adjust the size of the air inlet a and the air inlet b, adjust the mixing ratio of air and gas, and make the two gases fully mixed at the same time, and then pass the mixed gas through the mixed gas chamber connected to the mixing chamber The outlet leads to the combustion chamber of the engine; there is a cube on the outer surface of the mixing chamber, and the cube is connected to the square cover. The space surrounded by the cube and the square cover is larger than the outer size of the mixing chamber. The air pressure inside makes the mixing chamber rotate, so that the size of the air inlet a and the air inlet b can be controlled; the side wall of the air inlet a connected to the air chamber is provided with an air passage, and the air passage is connected to the square In the compensation chamber surrounded by the internal surface, the outer surface of the mixing chamber and the inner surface of the square cover, due to the "vacuumizing" effect of the engine, the compensation chamber at the top of the mixing chamber is in a negative pressure state, and the mixing chamber cannot move up and down, and a part must be connected Air, adjust the air pressure.

Further, in the case of excessively high gas pressure, in order to avoid damage to the gas chamber and the adjusting rod, a buffer chamber is provided between the gas chamber and the gas cover to buffer the gas pressure.

Further, the filter device includes a filter screen, the outer surface of the filter screen is covered with an air cover, and the air cover is provided with an air inlet port and a return hole for engine exhaust, and the air enters through the air inlet hole on the air cover, and utilizes The filter screen filters particles and impurities, so that clean air enters the air cavity, and the exhaust return hole on the air cover can return the incompletely combusted mixed gas at the engine exhaust port for recycling.

Further, the end of the adjusting rod is provided with a pin shaft, and the end face of the adjusting rod is connected with an adjusting spring, and the adjusting spring is connected with an adjusting screw, and the adjusting screw is fixed on the gas cover, so that the position of the adjusting rod can be adjusted to adapt to changes in air pressure. It can also buffer the force on the adjusting rod.

Further, a spring is arranged between the upper and lower surfaces inside the mixing chamber, the lower end and the side wall of the mixing chamber are respectively connected to the outlet of the mixed gas and the gas mixing ratio adjusting knob, and a pin shaft is arranged on the gas mixing ratio adjusting knob, and the side of the mixing chamber There is a chute at the connection between the wall and the gas mixing ratio adjustment knob, and the pin shaft slides up and down in the chute. Through the above structure, the gas mixing ratio adjustment knob does not move when the mixing chamber moves up and down, and the pin shaft is in the Just slide up and down in the chute; at the same time, there is a rotating valve at the outlet of the mixed gas, and the valve is a circular structure, and its diameter is the same as that of the outlet of the mixed gas. The valve adjustment rod is an integral structure, and the angle of the valve can be changed by rotating the valve through the valve adjustment rod, so that the size of the mixed gas outlet can be adjusted.

Further, the upper surface of the mixing chamber is connected to the valve adjusting rod, the lower surface of which is in contact with the threaded gas mixing ratio adjustment knob through the gasket, the upper surface of the mixing chamber is in contact with the gasket, and the gasket and the square cover are provided With a spring, the valve adjustment lever and the mixing ratio adjustment knob are vertically set, which is convenient for installation and saves space.

Further, the top of the adjusting rod is provided with a guide pin, and the adjusting rod and the air cavity and the air inlet of the gas cavity are respectively provided with an air intake valve, and the air intake valve is respectively formed by the round hole of the air cavity and the gas cavity air intake. It is composed of a disc corresponding to the adjustment rod and a circular cushion. The intake valve can adjust the volume of gas entering the chamber during the movement of the adjustment rod. At the same time, the cushion can play the role of sealing, cushioning and reducing wear. effect.

Further, the top of the adjusting rod is provided with a guide pin, and the air inlets of the adjusting rod and the air chamber, the gas chamber, and the buffer chamber are respectively provided with inlet valves, and the inlet valves are respectively composed of the air chamber, the gas chamber, and the buffer chamber. The round hole of the air inlet and the corresponding disk on the adjustment rod and the circular cushion are composed. The intake valve can adjust the volume of the gas entering the chamber during the movement of the adjustment rod. At the same time, the cushion can play the role of sealing, Buffer and reduce wear.

Further, the compensation chamber is a cavity surrounded by the inner surface of the cube, the upper surface of the mixing chamber, and the inner surface of the square cover.

Further, the inner surface of the cube is provided with an annular groove, and a compensation chamber is formed between the annular groove and the outer surface of the mixing chamber.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail:

Fig. 1 is the structural representation of embodiment 1 of gas engine low-pressure gas device of the present invention;

Fig. 2 is the structural representation of embodiment 2 of the gas engine low-pressure gas device of the present invention;

Fig. 3 is a schematic structural view of Embodiment 3 of the gas engine low-pressure gas device of the present invention.

Detailed ways

Example 1:

As shown in Figure 1: a gas engine low-pressure gas device, including a two-way pressure regulator 1 and a proportional mixing regulator 2. The two-way pressure regulator 1 includes an air chamber 3 and a gas chamber 4. A diaphragm 5 is provided between the air chamber 3 and the gas chamber 4 to isolate and maintain air pressure balance. The middle part of the diaphragm 5 is fixed with an adjustment rod 6 that moves up and down. The rod 6 runs through the entire air cavity 3 and the gas cavity 4 . The top of the air chamber 3 is provided with an air filter device, the filter device includes a filter screen 12, the outer surface of the filter screen 12 is covered with an air cover 13, and the air cover 13 is provided with an air inlet 14 and a return flow of the engine exhaust Hole 15. The lower end of the gas cavity 4 is connected to a gas cover 11, and the gas cover 11 is provided with a gas inlet 16. The top of described regulating rod 6 is provided with guide pin 7, and the air inlet place of regulating rod 6 and air chamber 3 and gas chamber 4 is respectively provided with air inlet valve 8, and air inlet valve 8 is formed by air chamber 3 and gas chamber 4 respectively. The round hole of the air inlet and the corresponding disc 9 and the annular soft pad 10 on the adjusting rod 6 are formed. The end of adjusting rod 6 is provided with bearing pin 17, and the end face of adjusting rod 6 ends is connected with adjusting spring 18, and adjusting spring 18 is connected with adjusting screw 19, and adjusting screw 19 is fixed on the gas cover 11. The proportional mixing regulator 2 includes a mixing chamber 20, a spring 21 is arranged between the upper and lower surfaces of the mixing chamber 20, and the lower end and side walls of the mixing chamber 20 are respectively connected to an outlet 22 of mixed gas and a gas mixing ratio adjusting knob 23. The gas mixing ratio adjusting knob 23 is provided with a pin shaft 24 , and the connection between the side wall of the mixing chamber 20 and the gas mixing ratio adjusting knob 23 is provided with a chute 25 , and the pin shaft 24 slides up and down in the chute 25 . The outlet 22 of the mixed gas is provided with a rotating valve 26, and the valve 26 is a circular structure, and its diameter is the same as that of the outlet 22 of the mixed gas. The rod 27 is an integral structure. At the same time, the side wall of the mixing chamber 20 is provided with an air inlet a28 and an air inlet b29, respectively connecting the air chamber 3 and the gas chamber 4. The outer surface of the mixing chamber 20 is provided with a square body 30 , the square body 30 is connected to the square cover 31 , and the side wall connected to the air inlet a28 of the air chamber 3 is provided with an air passage 32 , and the air passage 32 is connected to the compensation chamber 33 . The compensation cavity The compensation cavity 33 is a cavity surrounded by the inner surface of the square body 30 , the upper surface of the mixing chamber 20 , and the inner surface of the square cover 31 .

When working, the two-way pressure regulator 1 can adjust the pressure of the air chamber 3 proportionally to the pressure of the gas chamber 4 through the automatic adjustment of the adjustment rod 6 according to the change of the gas pressure, so that the gas and air are mixed in the mixing chamber 20 The proportion remained basically unchanged. For example, when the pressure of the gas chamber 4 becomes low, the pressure of the air chamber 3 is relatively high, which will push the diaphragm 5 to move downward together with the adjustment rod 6, so that the air inlet of the air intake valve 8 at the upper end of the adjustment rod 6 becomes smaller, and the air The amount of inflow will decrease, and the pressure of the air chamber 3 will also decrease accordingly. At the same time, the air inlet of the air intake valve 8 at the lower end of the adjustment rod 6 will become larger, the gas intake volume will increase, and the pressure in the gas chamber 4 will also rise. , finally, the pressures of the two chambers reach a dynamic balance in proportion; on the contrary, when the pressure of the gas chamber 4 becomes higher, similarly, the adjustment rod 6 moves up, and the air inlet of the air intake valve 8 at the lower end of the adjustment rod 6 becomes smaller, and the amount of gas entering decrease, the pressure of the gas chamber 4 weakens, and at the same time, the air inlet of the air intake valve 8 at the upper end of the adjustment rod 6 becomes larger, the air intake volume of the air chamber 3 increases, and the pressure of the air chamber 3 also increases. Finally, the pressures of the two chambers are proportional achieve a dynamic balance.

When the engine is inhaled, the proportional mixing regulator 2 is under negative pressure, the mixing chamber 20 slides to the lower position, and the gas mixing ratio adjustment knob 23 is in the middle position. The air inlet a28 and the air inlet b29 on the side wall of the mixing chamber are aligned with the air chamber 3 and the gas chamber 4 respectively. At this time, the opening degrees of the air inlet a28 and the air inlet b29 are maximum. When the air intake phase is about to be completed, the negative pressure in the proportional mixing regulator 2 (air passage 32 intake) decreases, and the proportional mixing regulator 2 is no longer in a low-pressure state, and the mixing chamber 20 is squeezed, and the spring 21 moves up, so that The openings of the air inlet a28 and the air inlet b29 decrease accordingly until the engine stops sucking air, the air inlet a28 and the air inlet b29 are automatically closed under the action of the spring 21; when the gas mixing ratio adjustment knob 23 is rotated, The mixing chamber 20 follows the rotation, and the cube 30 is fixed. At this time, the air inlet a28 and the air inlet b29 on the side wall of the mixing chamber 20 appear to be misplaced and blocked, and the opening ratio of the air inlet a28 and the air inlet b29 appears Corresponding non-linear changes, resulting in corresponding changes in the mixing ratio of gas and air. Adjust the gas mixing ratio adjustment knob 23 to reach the state of the best mixing ratio to meet the needs of the engine. The amount of gas supplied to the engine by the mixed gas in the mixing chamber 20 is determined by the size of the opening of the valve 26, which is realized by rotating the valve 26 with the valve adjusting lever 27 to change its angle, and is generally automatically adjusted by an electronic control circuit driving a motor. The control circuit automatically adjusts the opening degree of the valve 26 by detecting changes in the engine speed to form a closed-loop control. Of course, the opening degree of the air valve 26 can also be adjusted mechanically to realize the change of the gas mixture supply.

Example 2:

As shown in Figure 2: a low-pressure gas device for a gas engine, including a two-way pressure regulator 1 and a proportional mixing regulator 2. The two-way pressure regulator 1 includes an air chamber 3 and a gas chamber 4, and a diaphragm 5 is provided between the air chamber 3 and the gas chamber 4 to isolate and maintain air pressure balance. The middle part of the diaphragm 5 is fixed with an adjusting rod 6 that moves up and down, and the adjusting rod 6 runs through the entire air chamber 3 and the gas chamber 4 . The top of the air chamber 3 is provided with an air filter device, the filter device includes a filter screen 12, the outer surface of the filter screen 12 is covered with an air cover 13, and the air cover 13 is provided with an air inlet 14 and a return flow of the engine exhaust Hole 15. The lower end of the gas cavity 4 is connected to a gas cover 11 . The gas cover 11 is provided with a gas inlet 16 . The top of the regulating rod 6 is provided with a guide pin 7, and the air inlets of the regulating rod 6 and the air chamber 3 and the gas chamber 4 are respectively provided with an air inlet valve 8, and the air inlet valve 8 is fed by the air chamber 3 and the gas chamber 4. The round hole of the air port and the disc 9 on the adjusting rod 6 and the circular cushion 10 form. The end of adjusting rod 6 is provided with bearing pin 17, and the end face of adjusting rod 6 ends is connected with adjusting spring 18, and adjusting spring 18 is connected with adjusting screw 19, and adjusting screw 19 is fixed on the gas cover 11. The proportional mixing regulator 2 includes a mixing chamber 20, the side wall of the mixing chamber 20 is connected to the mixed gas outlet 22, the upper surface of the mixing chamber 20 is connected to the valve adjusting rod 27, and the lower surface thereof is adjusted by a gasket and a threaded gas mixing ratio. The knobs 23 are in contact with each other, and the side wall of the mixing chamber 20 is provided with an air inlet a28 and an air inlet b29, respectively connecting the air chamber 3 and the gas chamber 4. The outer surface of the mixing chamber 20 is provided with a square body 30, and the upper end of the square body 30 is provided with a square cover 31. The upper surface of the mixing chamber 20 is in contact with the gasket, and a spring 35 is arranged between the gasket and the square lid 31. The connecting air The side wall of the air inlet a28 of the chamber 3 is provided with an air passage 32, and the air passage 32 is connected to the compensation chamber. The compensation chamber is formed between the annular groove 36 on the square body 30 and the outer surface of the mixing chamber 20. cavity.

When working, the two-way pressure regulator 1 can automatically adjust the adjustment rod 6 up and down in two directions according to the change of the gas pressure, so that the pressure of the air chamber 3 changes in proportion to the pressure of the gas chamber 4, so that the gas and air are mixed in the mixing chamber 20 The proportion remained basically unchanged. For example, when the pressure of the gas chamber 4 becomes low, the pressure of the air chamber 3 is relatively high, which will push the diaphragm 5 to move downward together with the adjustment rod 6, so that the air inlet of the air intake valve 8 at the upper end of the adjustment rod 6 becomes smaller, and the air The amount of inflow will decrease, and the pressure of the air chamber 3 will also decrease accordingly. At the same time, the air inlet of the air intake valve 8 at the lower end of the adjustment rod 6 will become larger, the gas intake volume will increase, and the pressure in the gas chamber 4 will also rise. , finally, the pressures of the two chambers reach a dynamic balance in proportion; on the contrary, when the pressure of the gas chamber 4 becomes higher, similarly, the adjustment rod 6 moves up, and the air inlet of the air intake valve 8 at the lower end of the adjustment rod 6 becomes smaller, and the amount of gas entering decrease, the pressure of the gas chamber 4 weakens, and at the same time, the air inlet of the air intake valve 8 at the upper end of the adjustment rod 6 becomes larger, the air intake volume of the air chamber 3 increases, and the pressure of the air chamber 3 also increases. Finally, the pressures of the two chambers are proportional achieve a dynamic balance.

The mixing chamber 20 can slide axially in the cube 30 , and the mixing chamber 20 can move upward by rotating the gas mixing ratio adjustment knob 23 , while the cube 30 is fixed. At this time, the air inlet a28 and the air inlet b29 on the side wall of the mixing chamber 20 appear to be misplaced and blocked, causing air and gas intake to change, so that the mixing ratio of gas and air can be adjusted. The rotation of the valve adjusting rod 27 can cause the air inlet a28, the air inlet b29, and the mixed gas outlet 22 on the side wall of the mixing chamber 20 to be misplaced and blocked at the same time, so as to further adjust the entering ratio of air and gas, and can also adjust the mixed gas supply. Changes in gas volume. The valve adjustment lever 27 is generally automatically adjusted by driving the motor through an electronic control circuit, and the control circuit automatically adjusts the rotation degree of the valve adjustment lever 27 by detecting changes in the engine speed, forming a closed-loop control. Of course, the valve adjusting rod 27 can also be adjusted mechanically to realize the change of the air mixture supply.

In this embodiment, the sizes of the air inlet a28 and the air inlet b29 are inconsistent, and the diameter of the air inlet a28 is larger than that of the air inlet b29, which is suitable for small gas engines; in this embodiment, the hollow part of the air inlet b29 is set There is a one-way valve to prevent the gas from the engine from flowing backward into the gas chamber 4 and causing the diaphragm 5 to be damaged.

Example 3:

As shown in Figure 3: a low-pressure gas device for a gas engine, including a two-way pressure regulator 1 and a proportional mixing regulator 2. The two-way pressure regulator 1 includes an air chamber 3 and a gas chamber 4, and a diaphragm 5 is provided between the air chamber 3 and the gas chamber 4 to isolate and maintain air pressure balance. The middle part of the diaphragm 5 is fixed with an adjusting rod 6 that moves up and down, and the adjusting rod 6 runs through the entire air chamber 3 and the gas chamber 4 . The top of the air cavity 3 is provided with an air filter, and the filter includes a filter screen 12, and the outer surface of the filter screen 12 is covered with an air cover 13. The air cover 13 is provided with an air inlet 14 and a return hole 15 for engine exhaust. The lower end of the gas chamber 4 is connected to a buffer chamber 34, and the buffer chamber 34 is connected to the gas cover 11, and the gas cover 11 is provided with a gas inlet 16. The top of described adjustment rod 6 is provided with guide pin 7, and the air inlet place of adjustment rod 6 and air chamber 3, gas chamber 4, buffer chamber 34 is provided with intake valve 8 respectively, and intake valve 8 is formed by air chamber 3, Gas chamber 4, buffer chamber 34 air inlet round hole and disc 9 on the adjusting rod 6 and circular soft cushion 10 are formed, the end of adjusting rod 6 is provided with pin shaft 17, and the end face of adjusting rod 6 end is connected to adjust Spring 18, the adjustment spring 18 is connected with the adjustment screw 19, and the adjustment screw 19 is fixed on the gas cover 11. The proportional mixing regulator 2 includes a mixing chamber 20, a spring 21 is arranged between the upper and lower surfaces of the mixing chamber 20, and the lower end and side walls of the mixing chamber 20 are respectively connected to an outlet 22 of mixed gas and a gas mixing ratio adjusting knob 23. The gas mixing ratio adjusting knob 23 is provided with a pin shaft 24 , and the connection between the side wall of the mixing chamber 20 and the gas mixing ratio adjusting knob 23 is provided with a slide groove 25 , and the pin shaft 24 slides up and down in the slide groove 25 . The outlet 22 of the mixed gas is provided with a rotating valve 26, and the valve 26 is a circular structure, and its diameter is the same as that of the outlet 22 of the mixed gas. The rod 27 has an integral structure, and the side wall of the mixing chamber 20 is provided with an air inlet a28 and an air inlet b29, respectively connecting the air chamber 3 and the gas chamber 4. The outer surface of the mixing chamber 20 is provided with a square body 30, the square body 30 is connected to the square cover 31, the side wall of the air inlet a28 connected to the air chamber 3 is provided with an air passage 32, and the air passage 32 is connected to the compensation chamber 33, The compensation chamber 33 is a cavity surrounded by the inner surface of the cube 30 , the upper surface of the mixing chamber 20 and the inner surface of the square cover 31 .

When working, the two-way pressure regulator 1 can automatically adjust the adjustment rod 6 up and down in two directions according to the change of the gas pressure, so that the pressure of the air chamber 3 changes in proportion to the pressure of the gas chamber 4, so that the gas and air are mixed in the mixing chamber 20 The proportion remained basically unchanged. For example, when the pressure of the gas chamber 4 becomes low, the pressure of the air chamber 3 is relatively high, which will push the diaphragm 5 to move downward together with the adjustment rod 6, so that the air inlet of the air intake valve 8 at the upper end of the adjustment rod 6 becomes smaller, and the air The amount of inflow will decrease, and the pressure of the air chamber 3 will also decrease accordingly. At the same time, the air inlet of the air intake valve 8 at the lower end of the adjustment rod 6 will become larger, the gas intake volume will increase, and the pressure in the gas chamber 4 will also rise. , finally, the pressures of the two chambers reach a dynamic balance in proportion; on the contrary, when the pressure of the gas chamber 4 becomes higher, similarly, the adjustment rod 6 moves up, and the air inlet of the air intake valve 8 at the lower end of the adjustment rod 6 becomes smaller, and the amount of gas entering decrease, the pressure of the gas chamber 4 weakens, and at the same time, the air inlet of the air intake valve 8 at the upper end of the adjustment rod 6 becomes larger, the air intake volume of the air chamber 3 increases, and the pressure of the air chamber 3 also increases. Finally, the pressures of the two chambers are proportional achieve a dynamic balance.

In this implementation, a special case can also be solved. When the gas pressure is high, in order to avoid damage to the gas chamber 4 and the adjusting rod 6, a buffer chamber 34 is provided between the gas chamber 4 and the gas cover 11 to buffer the gas pressure. The mode of action is: the pressure of the gas entering from the gas port 16 is too high, so that the adjusting rod 6 moves upwards, and the air inlet of the air inlet valve 8 matched between the buffer cavity 34 and the adjusting rod 6 is smaller or closed.

Under the negative pressure of the proportional mixing regulator 2, the mixing chamber 20 slides to the lower position, the gas mixing ratio adjustment knob 23 is in the middle position, and the air inlet a28 and the air inlet b29 on the side wall of the mixing chamber are aligned with the air chamber 3 and the gas chamber respectively. Cavity 4. At this time, the opening degrees of the air inlet a28 and the air inlet b29 are maximum. When the air intake phase is about to be completed, the negative pressure in the proportional mixing regulator 2 (air passage 32 intake) decreases, and the proportional mixing regulator 2 is no longer in a low-pressure state, and the mixing chamber 20 is squeezed, and the spring 21 moves up, so that Air inlet a28, air inlet b29 degree of opening decreases thereupon, and when the engine stops working, air inlet a28, air inlet b29 are closed automatically under the action of spring 21. When the gas mixing ratio adjustment knob 23 is rotated, the mixing chamber 20 follows the rotation, and the cube 30 is fixed. At this time, the air inlet a28 and the air inlet b29 on the side wall of the mixing chamber 20 appear to be misplaced and blocked, and the air inlet a28, The opening ratio of the air inlet b29 has a corresponding non-linear change, resulting in a corresponding change in the mixing ratio of gas and air. Adjust the gas mixing ratio adjustment knob 23 to reach the best mixing ratio to meet the needs of the engine. The amount of gas supplied to the engine by the mixed gas in the mixing chamber 20 is determined by the size of the opening of the valve 26. It is realized by rotating the valve adjustment rod 27. Generally, the electronic control circuit drives the motor for automatic adjustment. The control circuit automatically adjusts by detecting changes in the engine speed. The size of the valve opening forms a closed-loop control. Of course, the opening degree of the air valve 26 can also be adjusted mechanically to realize the change of the air mixture supply.

The diaphragm 5 described in the above three embodiments is preferably made of a soft material, so that it is more sensitive when sensing pressure changes.

What is described above is only the preferred embodiment of the present utility model. It should be pointed out that for those skilled in the art, some deformations and improvements can be made without departing from the structure of the present utility model. These should also be regarded as The protection scope of the utility model, these all can not affect the effect that the utility model implements and the practicability of the patent.

Claims (10)

1. A low-pressure gas device for a gas engine, including a two-way pressure regulator and a proportional mixing regulator, characterized in that the two-way pressure regulator includes an air cavity and a gas cavity, and a membrane is provided between the air cavity and the gas cavity to maintain air pressure balance The middle part of the diaphragm is fixed with an adjustment rod, and the adjustment rod runs through the entire air chamber and gas chamber. The top of the air chamber is provided with an air filter device, and the lower end of the gas chamber is connected to a gas hood, and the gas hood is provided with a gas Inlet; the proportional mixing regulator includes a mixing chamber, the mixing chamber is connected to the outlet of the mixed gas and the gas mixing ratio adjustment knob, and the side wall of the mixing chamber is provided with an air inlet a and an air inlet b, respectively connected to the air chamber and the gas chamber , the outer surface of the mixing chamber is provided with a square body, the square body is connected to the square cover, and the side wall of the air inlet a connected to the air chamber is provided with an air passage, and the air passage is connected to the compensation area surrounded by the square body and the outer surface of the mixing chamber. cavity. 2. The gas engine low-pressure gas device according to claim 1, characterized in that: a buffer chamber is provided between the gas chamber and the gas cover. 3. The gas engine low-pressure gas device according to claim 1, characterized in that: the filter device includes a filter screen, the outer surface of the filter screen is covered with an air cover, and the air cover is provided with an air inlet and an engine exhaust. Air return hole. 4. The gas engine low-pressure gas device according to claim 1, characterized in that: the end of the adjusting rod is provided with a pin shaft, the end face of the adjusting rod is connected to an adjusting spring, the adjusting spring is connected to an adjusting screw, and the adjusting screw is fixed on on the gas hood. 5. The gas engine low-pressure gas device according to claim 1, characterized in that: a spring is arranged between the upper and lower surfaces inside the mixing chamber, and the lower end and side wall of the mixing chamber are respectively connected to the outlet of the mixed gas and the gas mixing ratio The adjustment knob, the gas mixing ratio adjustment knob is provided with a pin shaft, the side wall of the mixing chamber and the connection of the gas mixing ratio adjustment knob are provided with a chute, the pin shaft slides up and down in the chute, and the outlet of the mixed gas There is a rotating valve, and the valve is a circular structure, and its diameter is the same as the diameter of the outlet of the mixed gas. The valve is provided with a valve adjusting rod, and the valve and the valve adjusting rod are of an integrated structure. 6. The gas engine low-pressure gas device according to claim 1, characterized in that: the upper surface of the mixing chamber is connected to the valve adjustment rod, and the lower surface thereof is in contact with the threaded gas mixing ratio adjustment knob through a gasket, and the mixing The upper surface of the cavity is in contact with the gasket, and a spring is arranged between the gasket and the square cover. 7. The gas engine low-pressure gas device according to claim 1, characterized in that: the top of the adjustment rod is provided with a guide pin, and the adjustment rod and the air cavity and the air inlet of the gas cavity are respectively provided with an intake valve , the intake valve is made up of the round holes of the air chamber and gas chamber air inlet and the corresponding disc and circular cushion on the adjusting rod respectively. 8. The gas engine low-pressure gas device according to claim 1, characterized in that: the top of the adjustment rod is provided with a guide pin, and the adjustment rod and the air cavity, the gas cavity, and the air inlet of the buffer cavity are respectively provided with Intake valve, the intake valve is made up of air chamber, gas chamber, the round hole of the air inlet of buffer chamber and the corresponding disc and circular ring cushion on the adjusting rod. 9. The gas engine low-pressure gas device according to claim 1, characterized in that: the compensation chamber is a space surrounded by the inner surface of the cube, the upper surface of the mixing chamber, and the inner surface of the square cover. cavity. 10. The gas engine low-pressure gas device according to claim 1, characterized in that: the inner surface of the square body of the compensation chamber is provided with an annular groove, and the compensation chamber is formed between the annular groove and the outer surface of the mixing chamber.

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