JPS6343402Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a paperizer that gasifies LPG under reduced pressure and sends it to the mixer, when LPG is mixed with air in the mixer and supplied to the engine.

As is well known, the paperizer uses LPG in a pressure-resistant container.
The primary chamber introduces the
It is equipped with a secondary chamber that delivers LPG, and when the gas pressure in the secondary chamber becomes low, a passage connecting the primary chamber and the secondary chamber is opened in conjunction with the movement of the membrane that partitions the secondary chamber and the air chamber. , LPG is delivered from the primary chamber to the mixer via the secondary chamber. The passage is closed by a secondary valve on which a valve closing spring acts in the valve closing direction, and when the membrane moves in the valve closing direction, the secondary valve opens. In other words, when the engine is stopped, both the secondary chamber and the air chamber are at atmospheric pressure, so the secondary valve is closed by the action of the valve-closing spring, but when the engine starts, the suction pipe becomes negative pressure. When the gas pressure in the secondary chamber becomes lower than atmospheric pressure, the membrane moves toward the secondary chamber, overcomes the closing force of the valve closing spring, and closes the secondary valve.

In such paperizers, in order to supply the required amount of gas to the engine during engine idling and ensure stable idling, the primary and secondary chambers are communicated by a bypass separate from the passage opened and closed by the secondary valve. A bypass method in which the valve is closed, or a balance method in which a balance spring acts on the membrane in the direction of opening the secondary valve in opposition to the closing spring of the secondary valve may be adopted. However, although the bypass method has good idle reproducibility, there is a problem with the gas supply connection performance when transitioning from idle operation to light load low speed to medium speed operation, and the balance method has a problem with the transition from idle operation to medium speed operation. The gas supply connection performance is good when the engine is running, but there is a problem with idle reproducibility.

The present invention improves idle reproducibility and gas supply connection performance by combining the bypass method and balance method, which have opposite advantages and disadvantages, and by changing the pressure of the air introduced into the air chamber and acting on the membrane. Both were devised for the purpose of providing a good paperizer.

In order to achieve this purpose, this invention
Primary chamber where LPG is introduced and LPG gasified under reduced pressure
A secondary chamber that sends the liquid to the mixer, and a secondary valve that opens and closes a passage connecting the primary chamber and the secondary chamber,
In the paperizer, the secondary valve is opened by the movement of a membrane separating the secondary chamber and the air chamber toward the secondary chamber, and is closed by the action of a closing valve spring. A bypass that communicates the primary chamber and the secondary chamber, a balance spring that acts on the membrane and acts in the valve opening direction against the valve closing spring, an air vent provided in the air chamber, and a bench lily and throttle of the mixer. The engine is characterized by comprising a negative pressure port connected to a portion between the engine and the valve, and an on-off valve that closes the atmospheric port when the engine is idling but opens when the engine is off-idle.

Next, a specific example of the present invention will be explained based on the drawings.

In the figure, 1 is a paperizer according to the present invention, 3
Reference numeral 2 indicates a mixer, and the paperizer 1 has a primary chamber 4 with an open inlet 3 connected to a pressure-resistant container 2 filled with LPG, and a nozzle 34 opened in a bench lily 33 of a mixer 32, in which LPG gasified under reduced pressure is sent. The inlet 3 is opened and closed by a primary valve 10 that is connected to a membrane 9 that partitions the primary chamber 4 and the atmospheric chamber 8. The passage 7 connecting the primary chamber 4 and the secondary chamber 6 is opened and closed by a secondary valve 13 interlocked with a membrane 12 that separates the primary chamber 4 from the air chamber 11. It is attached to one end of a lever 15 rotatably built into the next chamber 6 and actuated by a valve closing spring 14, and the other end of this lever 15 is in contact engagement with the center of the membrane 12.

The primary chamber 4 and the secondary chamber 6 communicate with each other through a bypass 16 in addition to the passage 7, and this bypass 16 includes a manually adjusted throttle 17 and an electromagnetically driven on-off valve that opens when the engine is running but closes when the engine is stopped. 18
It is equipped with

A balance lever 19 and a counter lever 20 are rotatably built into the air chamber 11, and a balance spring 21 is inserted between one end of the balance lever 19 and the center of the membrane 12. A counter lever 20 is brought into contact with the other end of the balance lever 19, and an adjustment spring 22 is actuated to weaken the force of the balance spring 21. When the adjustment screw 23 is screwed in, the counter lever 20 that is in contact with the tip thereof becomes the balance lever 19.
Press and rotate to compress the balance spring 21 and sharpen the opening operation of the secondary valve 13.

Further, the air chamber 11 has an atmospheric port 24 and a negative pressure port 25. The atmospheric port 24 is opened and closed by an on-off valve 27 driven by a solenoid 26, and the negative pressure port 25 is connected to the bench lily 33 of the mixer 32. It is connected to the throttle valve 35 through a negative pressure path 29 having a throttle 28 . The solenoid 26 is an electric circuit 3 equipped with a switch 30 that opens and closes depending on the opening degree of a throttle valve 35.
It is activated by the current flowing through the valve 1 and works to open the on-off valve 27 during off-idle.

In this embodiment configured in this way, when the engine is stopped, both the secondary chamber 6 and the air chamber 11 are at atmospheric pressure, so the lever 15 is moved by the valve closing spring 14.
By this action, the secondary valve 13 is rotated so as to come into close contact with the open end of the passage 7, thereby closing the passage 7.

When the engine is started, the on-off valve 1 of the bypass 16
8 is opened and LPG in the primary chamber 4 flows into the secondary chamber 6 through the bypass 16. During idling, the on-off valve 27 of the atmospheric port 24 is closed, and the negative pressure slightly lower than atmospheric pressure generated between the bench lily 33 and the throttle valve 35 of the mixer 32 flows through the negative pressure path 29. Then, the negative pressure from the nozzle of the bench lily 33 acts on the secondary chamber 6. Therefore, the differential pressure between the secondary chamber 6 and the air chamber 11 is extremely small, and even if the difference between the valve-closing force by the valve-closing spring 14 and the valve-opening force by the balance spring 21 is not precisely adjusted, the membrane 12 With the secondary valve 13 kept closed, only LPG passing through the bypass 16 is sent to the mixer 32. Therefore, during idling, only the bypass 16 is used without passing through the passage 7.
Since LPG flows through the engine and is not affected by variations in the opening operation of the secondary valve 13, the idle reproducibility is good and stable idle operation is always performed.

When the throttle valve 35 begins to open after idling, the on-off valve 27 that had closed the air port 24 opens and the air is introduced into the air chamber 11. Bench lily 33 in the area where light load low speed then medium speed operation
As the air flow rate through the chamber gradually increases and the nozzle negative pressure gradually increases, the differential pressure between the secondary chamber 6 and the air chamber 11 gradually increases, and the membrane 12 is caused by this differential pressure and the elasticity of the balance spring 21. moves toward the secondary chamber 6, overcomes the valve closing force of the valve closing spring 14 and rotates the lever 15 to open the secondary valve 13, allowing a certain amount of LPG to pass through the bypass 16 and the secondary valve 13. LPG passing through the passage 7 is sent to the mixer 32 according to the opening degree. Also, at off-idle, the valve closing spring 1
The secondary valve 13 opens in proportion to the spring load until the balance spring 4 and the balance spring 21 are in equilibrium, exhibiting good gas connection performance.

In the high-speed operating range, the membrane 12 moves largely toward the secondary chamber 6, so the balance spring 21 extends to its free length, and from then on only the valve closing spring 14 controls the membrane 12.

The on-off valve 27 of the atmospheric port 24 may be opened and closed by the suction pipe negative pressure, and an on-off valve that opens and closes in the opposite direction to this on-off valve 27 may be provided in the negative pressure path 29 to turn off and off.
The air chamber 11 may be prevented from being affected by negative pressure during idling.

As is clear from the above explanation, the present invention employs both a bypass method and a balance method, and uses the low negative pressure generated between the mixer's vent lily and the throttle valve during engine idling to the air chamber. Since the pressure difference with the secondary chamber is reduced, the movement of the membrane is suppressed and the secondary valve is reliably kept closed, allowing the gas required for idle operation to be maintained only by bypass. is supplied accurately to ensure stable idling at all times. Also, off-
When idling, the atmosphere acts on the air chamber, so the membrane uses differential pressure and the force of the balance spring to open the secondary valve and supply gas appropriately so that the throttle valve opening is proportional to the engine speed. . Furthermore,
Since the air chamber is switched from low negative pressure to atmospheric pressure, pressure fluctuations are small and there is no problem of suddenly moving the membrane and opening the secondary valve unstablely. Since LPG passing through the passage is added and sent to the mixer according to the amount of time, the connection between idle operation and off-idle operation is stable, and it also shows good gas connection performance for medium speed operation and even high speed operation. This allows stable engine operation over the entire operating range.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view showing a specific example of the present invention. 1...paperizer, 4...primary chamber, 6...secondary chamber, 7...passage, 11...air chamber, 12...
Membrane, 13...Secondary valve, 14...Valve closing spring, 16...
...Bypass, 21...Balance spring, 24...Atmospheric port, 25...Negative pressure port, 27...Opening/closing valve, 32...
...mixer, 33...bench lily, 35...throttle valve.

Claims (1)

[Scope of utility model registration request] The primary chamber where LPG is introduced and the
It includes a secondary chamber that sends LPG to a mixer, and a secondary valve that opens and closes a passage connecting the primary chamber and the secondary chamber, and the secondary valve separates the secondary chamber from the air chamber. In a paper riser that is opened by the movement of the membrane toward the secondary chamber and closed by the action of a closing spring, the membrane includes a bypass communicating with the primary chamber and the secondary chamber; a balance spring that acts in the valve opening direction against the valve closing spring; a negative pressure port that is connected to an atmosphere port provided in the air chamber and a portion between the bench lily of the mixer and the throttle valve;
A paperizer comprising an on-off valve that closes the atmospheric air port when the engine is idling, but opens when the engine is off-idle.