A control method for a pure mechanical pneumatic control logic actuator of a vacuum toilet

Abstract

The present invention discloses a control method for a pure mechanical pneumatic control logic actuator of a vacuum toilet, comprising the following steps: 1) 0-position state control, 2) system start-up of a flush, 3) sewage tank pumping, 4) secondary flushing, 5) sewage tank discharge, and 6) resetting. The control method of the present invention has simple steps, and can not only adjust the speed of opening or closing of the first pneumatic stop valve and the second pneumatic stop valve, and reduce the noise of the toilet during the suction and sewage discharge process, but also play the role of airflow flushing the inner wall of the flow channel, preventing the risk of dirt adhesion and jamming, and improving the sewage discharge efficiency, and at the same time can ensure that the sewage and air in the sewage tank will not flow back through the first pneumatic stop valve.

Description

Technical Field

[0001] The invention relates to a control method of a pure mechanical pneumatic control logic actuator for a vacuum toilet. Background Art

[0002] Vacuum toilets have good water-saving and sewage-discharging performance and are widely used in airplanes, trains, ships, public toilets, etc. However, vacuum toilets are noisy during use. The noise of vacuum toilets mainly comes from two aspects: on the one hand, the noise caused by the friction and collision of sewage in the sewage pipe; on the other hand, the high pressure difference generated by the vacuum rapidly accelerates the air and flushing water at the toilet sewage outlet, and the high-speed air and flushing water at the toilet sewage outlet rub against the sewage outlet and vibrate to generate noise. The noise generated in the sewage pipe can be eliminated by wrapping and isolating, but the noise generated at the sewage outlet cannot be installed with a silencer due to the structure, so it is difficult to eliminate. Summary of the invention

[0003] The purpose of the present invention is to address the deficiencies in the prior art and to provide a technical solution for a control method of a purely mechanical pneumatic control logic actuator for a vacuum toilet, which can not only adjust the speed at which the first pneumatic stop valve and the second pneumatic stop valve are opened or closed, thereby reducing the noise of the toilet during suction and discharge, but also allow the airflow to flush the inner wall of the flow channel, thereby preventing the risk of dirt adhesion and jamming, thereby improving the efficiency of discharge, and at the same time ensuring that sewage and air in the sewage tank will not flow back through the first pneumatic stop valve.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A control method for a pure mechanical pneumatic control logic actuator of a vacuum toilet, characterized by comprising the following steps:

[0006] 1)0-bit state control

[0007] a. The mechanical valve is normally closed and does not receive a control signal. At this time, the mechanical valve is disconnected and the second pneumatic valve has no signal;

[0008] b. The eighth pneumatic valve is normally open, and the gas in the first pressure tank enters the exhaust throttle valve through the eighth pneumatic valve, and then enters the first pneumatic stop valve through the exhaust throttle valve, so that the first pneumatic stop valve is closed. At this time, the toilet is disconnected from the sewage tank; when in the 0 position state, the quick exhaust valve does not work. By adjusting the throttling opening of the exhaust throttle valve and controlling the opening speed of the first pneumatic stop valve, the initial speed of sewage passing through the flow channel of the first pneumatic stop valve can be increased, reducing the risk of dirt adhesion and jamming. At the same time, due to the action of the exhaust throttle valve, the noise when the pressure of the first pneumatic stop valve is released is reduced.

[0009] c. The tenth pneumatic valve is normally open, and the gas in the first pressure tank enters the second air inlet throttle valve through the tenth pneumatic valve, and the gas enters the second pneumatic stop valve through the second air inlet throttle valve, so that the second pneumatic stop valve is closed. At this time, the sewage tank is disconnected from the sewage pipe.

[0010] d. The fourth pneumatic valve is normally open, and the vacuum tank is connected to the sewage tank;

[0011] When in the 0 position state, the first air intake throttle valve does not work, and the closing speed of the second pneumatic stop valve is controlled by adjusting the second air intake throttle valve, and the opening speed of the second pneumatic stop valve can be controlled by adjusting the first air intake throttle valve.

[0012] The second pneumatic stop valve opens slowly during sewage discharge, so that the sewage tank is in a pressurized process for a certain period of time, which can reduce the pressure difference between the sewage tank and the second pressure tank and reduce noise.

[0013] 2) The system starts flushing once

[0014] a. Press the button of the mechanical valve, the mechanical valve is opened, the gas passes through the mechanical valve and enters the second pneumatic valve, making the second pneumatic valve open, the gas in the first pressure tank passes through the second pneumatic valve and enters the fifth pneumatic valve, at this time the fifth pneumatic valve is in the disconnected state;

[0015] b. Part of the gas passes through the second pneumatic valve and enters the first regulating valve as a control signal. The first regulating valve will generate a control signal when the set regulating time is reached;

[0016] c. During the adjustment process of the first regulating valve, if the set adjustment time has not been reached, part of the gas enters the third pneumatic valve through the second pneumatic valve, the third pneumatic valve is normally open, and the gas enters the water valve through the third pneumatic valve, the water valve is normally in a closed state, and when the water valve receives a control signal, the water source enters the water outlet of the toilet through the water valve for flushing;

[0017] d. The fourth pneumatic valve is normally open. When the gas in the first pressure tank enters the fourth pneumatic valve, the fourth pneumatic valve receives a control signal, the fourth pneumatic valve is disconnected, and the vacuum tank is disconnected from the sewage tank. At this time, the sewage tank maintains a vacuum negative pressure state;

[0018] 3) Pumping in sewage tank

[0019] a. After the first regulating valve reaches the set regulating time, the fifth pneumatic valve is opened after receiving the control signal, and the gas enters the sixth pneumatic valve through the fifth pneumatic valve. At this time, the sixth pneumatic valve is opened, the third pneumatic valve receives the control signal, and controls the third pneumatic valve to be disconnected. The water valve loses the control signal and is disconnected, the water source is cut off, and the flushing action ends;

[0020] b. Part of the gas passes through the sixth pneumatic valve as a control signal and enters the eighth pneumatic valve. After receiving the control signal, the eighth pneumatic valve is disconnected, and the gas in the exhaust throttle valve is restricted. The gas in the sixth pneumatic valve passes through the quick exhaust valve and enters the first pneumatic stop valve. The first pneumatic stop valve slowly deflates through the exhaust throttle valve, so that the first pneumatic stop valve is slowly opened, and the sewage outlet of the toilet is connected to the sewage tank, so that the sewage in the toilet is pumped into the sewage tank;

[0021] c. The gas enters the seventh pneumatic valve through the sixth pneumatic valve. At this time, the seventh pneumatic valve is disconnected, and part of the gas enters the second regulating valve as a control signal. The second regulating valve will generate a control signal when the set adjustment time is reached. At this time, the seventh pneumatic valve does not receive a control signal;

[0022] The execution time of sewage tank pumping is about 2.5 to 3.5 seconds. When the sewage tank pumping procedure is carried out, the first pneumatic stop valve is slowly opened, so that the pressure at the sewage outlet of the toilet slowly increases, reducing the noise during pumping. The internal flow channel of the first pneumatic stop valve body slowly increases, which can increase the initial speed of sewage flowing through the first pneumatic stop valve and reduce the risk of dirt adhesion and jamming. At the same time, due to the throttling effect of the exhaust throttle valve, the noise when the pressure of the first pneumatic stop valve is released through the eighth pneumatic valve is reduced.

[0023] 4) Secondary flushing

[0024] a. After the second regulating valve reaches the set regulating time, the seventh pneumatic valve receives a control signal to conduct the seventh pneumatic valve, and the sixth pneumatic valve receives a control signal. At this time, the gas circuit is switched, and the gas circuit directly connected to the rear end of the sixth pneumatic valve releases pressure through the sixth pneumatic valve;

[0025] b. At this time, the third pneumatic valve loses the control signal, the third pneumatic valve is reset to normal state, the third pneumatic valve is open, the water valve receives the control signal, the water from the water source enters the toilet, and the secondary flushing is realized;

[0026] c. At this time, the eighth pneumatic valve loses the control signal, the eighth pneumatic valve is reset, the eighth pneumatic valve is open, the gas in the first pressure tank enters the first pneumatic stop valve through the exhaust throttle valve, the quick exhaust valve does not get gas, the first pneumatic stop valve is exhausted through the quick exhaust valve, the first pneumatic stop valve is quickly closed, and the toilet is disconnected from the sewage tank; the residual gas in the seventh pneumatic valve is discharged into the atmosphere through the seventh pneumatic valve to release the pressure;

[0027] 5) Sewage tank discharge

[0028] a. The gas enters the eleventh pneumatic valve through the sixth pneumatic valve. After receiving the control signal, the eleventh pneumatic valve is opened, and the gas in the second pressure tank enters the sewage tank, and the pressure in the sewage tank increases;

[0029] b. The gas enters the tenth pneumatic valve through the sixth pneumatic valve. The tenth pneumatic valve is disconnected after receiving the control signal. The gas in the first air intake throttle valve and the second air intake throttle valve is restricted. The second pneumatic stop valve releases the gas through the second air intake throttle valve and the tenth pneumatic valve. The gas enters the first air intake throttle valve through the sixth pneumatic valve and enters the second pneumatic stop valve, so that the second pneumatic stop valve is slowly opened, the sewage tank is connected to the sewage pipe, and the sewage is discharged from the sewage pipe through the second pneumatic stop valve;

[0030] c. The gas passes through the sixth pneumatic valve to the ninth pneumatic valve. At this time, the ninth pneumatic valve is disconnected and in a disconnected state. Part of the gas enters the third regulating valve as a control signal. The third regulating valve sets the regulating time and generates a control signal. At this time, the ninth pneumatic valve does not receive a control signal.

[0031] The execution time of sewage tank discharge is about 2 to 3 seconds. When sewage is discharged, the first pneumatic stop valve is quickly reset and closed, and the second pneumatic stop valve is slowly opened at the same time, which can not only ensure that the sewage and air in the sewage tank will not flow back through the first pneumatic stop valve, but also reduce the noise during sewage discharge. The first pneumatic stop valve is quickly exhausted, and the valve body flow channel of the first pneumatic stop valve is quickly closed. At this time, the second pneumatic stop valve is restricted by the first intake throttle valve and the intake speed is slow. The second pneumatic stop valve is normally exhausted, and the valve body flow channel of the second pneumatic stop valve is slowly opened. The closing time of the first pneumatic stop valve needs to be earlier than the full opening time of the second pneumatic stop valve. At the same time, the eleventh pneumatic valve is conducted, and the pressure of the second pressure tank enters the sewage tank through the eleventh pneumatic valve. Since the pressure gas is transferred from high pressure to low pressure, the eighth pneumatic valve has also been reset, and the first pneumatic stop valve is quickly closed, which can ensure that the low-pressure outlet at this time is only the flow channel of the second pneumatic stop valve, ensuring that the sewage and air in the sewage tank will not flow back through the first pneumatic stop valve. When the pressurized gas is released, it is easy to generate noise at the low-pressure port. The second pneumatic stop valve is opened slowly, so that the sewage tank is in the pressurization process for a certain period of time, which can reduce the pressure difference between the sewage tank and the second pressure tank and reduce noise.

[0032] 6) Reset

[0033] a. After the third regulating valve reaches the set regulating time, the ninth pneumatic valve receives a control signal, the ninth pneumatic valve is opened, and the gas enters the second pneumatic valve through the ninth pneumatic valve, disconnecting the second pneumatic valve. The gas path directly connected to the rear end of the second pneumatic valve releases the residual pressure through the second pneumatic valve, and the second pneumatic valve is reset;

[0034] b. At the same time, the gas passes through the ninth pneumatic valve and enters the sixth pneumatic valve. The sixth pneumatic valve receives a control signal and resets to the on state, executing the switch;

[0035] c. At the same time, the tenth pneumatic valve does not receive a control signal and is reset, and is in a conducting state. The gas in the first pressure tank enters the second air intake throttle valve through the tenth pneumatic valve, and the gas enters the second pneumatic stop valve through the second air intake throttle valve, so that the second pneumatic stop valve is reset and closed, and the sewage tank is disconnected from the sewage pipe. At this point, the system returns to the 0 position state and completes the reset.

[0036] The control method has simple steps. It can not only adjust the speed of opening or closing the first pneumatic stop valve and the second pneumatic stop valve to reduce the noise of the toilet during suction and discharge, but also play the role of airflow flushing the inner wall of the flow channel, preventing the risk of dirt adhesion and jamming, improving the efficiency of sewage discharge, and at the same time ensuring that sewage and air in the sewage tank will not flow back through the first pneumatic stop valve.

[0037] Furthermore, the first pneumatic stop valve and the second pneumatic stop valve each include a valve body, a cylinder, a rubber tube, a first clamping rod and a second clamping rod. The valve body is provided with a first pipe joint and a second pipe joint. The rubber tube is provided between the first pipe joint and the second pipe joint. The cylinder is movably connected to the valve body. The cylinder is connected to the first clamping rod through a piston rod. The second clamping rod is fixedly connected to the cylinder. The first clamping rod and the second clamping rod are driven to move by the cylinder to achieve clamping or loosening of the rubber tube. The first clamping rod is driven by the cylinder through the piston rod to approach the rubber tube until the second clamping rod is When the first clamping rod cannot continue to compress the rubber tube, the piston rod continues to extend, causing the cylinder to move in the opposite direction, driving the second clamping rod to approach the rubber tube, clamping the rubber tube, and closing the first pneumatic stop valve and the second pneumatic stop valve. When the cylinder drives the first clamping rod away from the rubber tube through the piston rod until the first clamping rod is separated from the rubber tube and cannot move, the piston rod continues to retract, causing the cylinder to move, driving the second clamping rod away from the rubber tube, loosening the rubber tube, and opening the first pneumatic stop valve and the second pneumatic stop valve. The control is flexible and convenient.

[0038] Furthermore, the execution time of step 3) pumping the sewage into the tank is 2.5 to 3 seconds.

[0039] Furthermore, when the sewage tank is pumped into the sewage tank, the first pneumatic stop valve is slowly opened, so that the pressure at the sewage outlet of the toilet is slowly increased, thereby reducing the noise during the pumping.

[0040] Furthermore, the execution time of step 5) sewage tank discharge is 2 to 3 seconds.

[0041] Furthermore, when sewage is discharged, the first pneumatic stop valve is quickly reset and closed, and the second pneumatic stop valve is slowly opened at the same time, which not only ensures that the sewage and air in the sewage tank will not flow back through the first pneumatic stop valve, but also reduces the noise during sewage discharge.

[0042] Furthermore, when the system is reset in step 6), the first pneumatic stop valve remains closed, and the second pneumatic stop valve slowly closes due to the throttling limit of the second air intake throttle valve. When the discharge program is executed for about 1.8±0.2 seconds, the sewage in the sewage tank has been discharged. Within 2 to 2.5 seconds, the medium passing through the flow channel of the second pneumatic stop valve is the residual pressure gas in the sewage tank. The slow closing of the flow channel of the second pneumatic stop valve helps to increase the speed of the residual pressure gas in the sewage tank passing through the flow channel of the second pneumatic stop valve, which plays a role in flushing the inner wall of the flow channel by airflow, reduces the risk of dirt adhesion and jamming, and increases the service life of the second pneumatic stop valve.

[0043] Further, in step 6) when the second pneumatic valve is disconnected and reset in process a, the gas in the first pressure tank does not pass through the second pneumatic valve, the gas does not enter the water valve through the third pneumatic valve, the water valve is reset, the water valve is disconnected, the fourth pneumatic valve does not receive a control signal, the fourth pneumatic valve is reset, so that the vacuum tank is connected to the sewage tank, the gas does not enter the fifth pneumatic valve, the gas does not enter the first regulating valve, the fifth pneumatic valve loses the control signal, and the fifth pneumatic valve is reset and disconnected.

[0044] Further, in step 6) process b, the sixth pneumatic valve is switched, at which time the eighth pneumatic valve maintains the previous reset state, and the gas in the first pressure tank enters the exhaust throttle valve through the eighth pneumatic valve, and the gas enters the first pneumatic stop valve through the exhaust throttle valve, so that the first pneumatic stop valve is closed, and the toilet is disconnected from the sewage tank.

[0045] The present invention has the following beneficial effects due to the adoption of the above technical solution:

[0046] 1. The control method has simple steps, which can not only adjust the speed of opening or closing the first pneumatic stop valve and the second pneumatic stop valve, and reduce the noise of the toilet during suction and sewage discharge, but also play the role of air flow flushing the inner wall of the flow channel, preventing the risk of dirt adhesion and jamming, and improving the sewage discharge efficiency. At the same time, it can ensure that the sewage and air in the sewage tank will not flow back through the first pneumatic stop valve.

[0047] 2. The quick exhaust valve and the exhaust throttle valve can increase the initial speed of sewage passing through the flow channel of the first pneumatic stop valve, reduce the risk of dirt adhesion and jamming, and at the same time, due to the effect of the exhaust throttle valve, reduce the noise when the pressure of the first pneumatic stop valve is released.

[0048] 3. The second pneumatic stop valve opens slowly during sewage discharge, which allows the sewage tank to be pressurized for a certain period of time, thereby reducing the pressure difference between the sewage tank and the second pressure tank and reducing noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The present invention will be further described below in conjunction with the accompanying drawings:

[0050] Figure 1 This is a flow chart of a control method of a pure mechanical pneumatic control logic actuator for a vacuum toilet according to the present invention;

[0051] Figure 2 It is a schematic diagram of the structure of the first pneumatic stop valve and the second pneumatic stop valve in the present invention.

[0052] In the figure: 1-mechanical valve; 2-second pneumatic valve; 3-third pneumatic valve; 4-water valve; 5-fourth pneumatic valve; 6-fifth pneumatic valve; 601-first regulating valve; 7-sixth pneumatic valve; 8-seventh pneumatic valve; 801-second regulating valve; 9-quick exhaust valve; 10-eighth pneumatic valve; 11-exhaust throttle valve; 12-first pneumatic stop valve; 13-ninth pneumatic valve; 1301-third regulating valve; 14-first intake throttle valve; 15- The tenth pneumatic valve; 16-the second air intake throttle valve; 17-the second pneumatic stop valve; 18-toilet; 18a-water nozzle; 19-sewage tank; 20-vacuum tank; 21-the first pressure tank; 22-the second pressure tank; 23-sewage pipe; 24-the eleventh pneumatic valve; 25-valve body; 26-cylinder; 27-rubber tube; 28-the first pipe joint; 29-the second pipe joint; 30-piston rod; 31-the first clamping rod; 32-the second clamping rod. DETAILED DESCRIPTION

[0053] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0054] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only embodiments of a part of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0055] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0056] like Figure 1 to Figure 2 As shown, a control method of a pure mechanical pneumatic control logic actuator of a vacuum toilet according to the present invention comprises the following steps:

[0057] 1)0-bit state control

[0058] a. Mechanical valve 1 is normally closed and does not receive a control signal. At this time, port P of mechanical valve 1 is disconnected from port A, and there is no signal at port KR of the second pneumatic valve 2.

[0059] b. The eighth pneumatic valve 10 is normally open, and the gas in the first pressure tank 21 enters the exhaust throttle valve 11 through the eighth pneumatic valve 10, and the gas enters the a port of the first pneumatic stop valve 12 through the exhaust throttle valve 11, so that the first pneumatic stop valve 12 is closed. At this time, the toilet 18 is disconnected from the b port of the sewage tank 19; in the 0 position state, the quick exhaust valve 9 does not work, and the P port to the A port of the exhaust throttle valve 11 is not restricted, and the A port to the P port is restricted. By adjusting the throttling opening of the exhaust throttle valve 11, the opening speed of the first pneumatic stop valve 12 is controlled, which can increase the initial speed of sewage passing through the flow channel of the first pneumatic stop valve 12 and reduce the risk of dirt adhesion and jamming. At the same time, due to the action of the exhaust throttle valve 11, the noise of the first pneumatic stop valve 12 during pressure release is reduced.

[0060] c. The tenth pneumatic valve 15 is normally open, and the gas in the first pressure tank 21 enters the second air intake throttle valve 16 through the tenth pneumatic valve 15, and the gas enters the port a of the second pneumatic stop valve 17 through the second air intake throttle valve 16, so that the second pneumatic stop valve 17 is closed, and at this time, the port d of the sewage tank 19 is disconnected from the sewage pipe 23;

[0061] d. The fourth pneumatic valve 5 is normally open, and the vacuum tank 20 is connected to the port C of the sewage tank 19. The function of the vacuum tank 20 is to provide vacuum compensation for the sewage tank 19. At the same time, there is a flow channel design in the vacuum tank 20, which has the function of flow channel buffering, and when the system is reset, the vacuum tank 19 is quickly compensated for vacuum, so as to be quickly prepared for the second use;

[0062] When in the 0 position, the first air intake throttle valve 14 does not work, the airflow from port P to port A of the second air intake throttle valve 16 is restricted, and the airflow from port A to port P is not restricted. The closing speed of the second pneumatic stop valve 17 is controlled by adjusting the second air intake throttle valve 16, and the opening speed of the second pneumatic stop valve 17 can be controlled by adjusting the first air intake throttle valve 14.

[0063] The second pneumatic stop valve 17 is opened slowly during sewage discharge, so that the sewage tank 19 is in a pressurized process for a certain period of time, which can reduce the pressure difference between the port a of the sewage tank 19 and the second pressure tank 22 and reduce noise.

[0064] The first pneumatic stop valve 12 and the second pneumatic stop valve 17 both include a valve body 25, a cylinder 26, a rubber tube 27, a first clamping rod 31 and a second clamping rod 32. The valve body 25 is provided with a first pipe joint 28 and a second pipe joint 29. The rubber tube 27 is arranged between the first pipe joint 28 and the second pipe joint 29. The cylinder 26 is movably connected to the valve body 25. The cylinder 26 is connected to the first clamping rod 31 through a piston rod 30. The second clamping rod 32 is fixedly connected to the cylinder 26. The cylinder 26 drives the first clamping rod 31 and the second clamping rod 32 to move, thereby clamping or loosening the rubber tube 27. The cylinder 26 drives the first clamping rod 31 to approach the rubber tube 27 through the piston rod 30. , until the first clamping rod 31 can no longer press the rubber tube 27, at this time the piston rod 30 continues to extend, so that the cylinder 26 moves in the opposite direction, driving the second clamping rod 32 close to the rubber tube 27, clamping the rubber tube 27, and closing the first pneumatic stop valve 12 and the second pneumatic stop valve 17. When the cylinder 26 drives the first clamping rod 31 away from the rubber tube 27 through the piston rod 30, until the first clamping rod 31 is separated from the rubber tube 27 and cannot move, the piston rod 30 continues to retract, so that the cylinder 26 moves, driving the second clamping rod 32 away from the rubber tube 27, loosening the rubber tube 27, and opening the first pneumatic stop valve 12 and the second pneumatic stop valve 17, and the control is flexible and convenient. The a and b ports of the first pneumatic stop valve and the second pneumatic stop valve are the control gas pressure inlets of the cylinders, the P port is the medium inlet and pressure, the A port is the medium outlet and pressure, and the air pressure of the a port is less than P+0.2Mpa, so that low pressure controls high pressure media.

[0065] 2) The system starts flushing once

[0066] a. Press the button H of the mechanical valve 1, the P port of the mechanical valve 1 is connected with the A port, the gas enters the KR port of the second pneumatic valve 2 through the A port of the mechanical valve 1, so that the P port of the second pneumatic valve 2 is connected with the A port, and the gas in the first pressure tank 21 enters the P port of the fifth pneumatic valve 6 through the second pneumatic valve 2. At this time, the P port of the fifth pneumatic valve 6 is disconnected from the A port, and the fifth pneumatic valve 6 is in a disconnected state;

[0067] b. Part of the gas enters the first regulating valve 601 through the port A of the second pneumatic valve 2 as the control signal K. The first regulating valve 601 will generate the control signal K when the set regulating time is reached;

[0068] c. During the adjustment process of the first regulating valve 601, if the set adjustment time has not been reached, part of the gas enters the third pneumatic valve 3 through the A port of the second pneumatic valve 2, and the P port and the A port of the third pneumatic valve 3 are normally connected, and the gas enters the water valve 4 through the A port of the third pneumatic valve 3, and the water valve 4 is normally in a closed state. When the water valve 4 receives the control signal K, the P port of the water valve 4 is connected to the A port, and the water from the water source passes through the water valve 4 and enters the water spray port 18a of the toilet 18 for flushing;

[0069] d. The fourth pneumatic valve 5 is normally open. When the gas in the first pressure tank 21 enters the fourth pneumatic valve 5, the fourth pneumatic valve 5 receives the control signal K, the P port of the fourth pneumatic valve 5 is disconnected from the A port, the vacuum tank 20 is disconnected from the C port of the sewage tank 19, and the sewage tank 19 maintains a vacuum negative pressure state;

[0070] 3) Pumping in sewage tank

[0071] a. After the first regulating valve 601 reaches the set regulating time, the fifth pneumatic valve 6 is opened after receiving the control signal K, and the gas enters the P port of the sixth pneumatic valve 7 through the A port of the fifth pneumatic valve 6. At this time, the P port of the sixth pneumatic valve 7 is opened to the A port, and the third pneumatic valve 3 receives the control signal K, which controls the P port of the third pneumatic valve 3 to be disconnected from the A port. The water valve 4 loses the control signal, so that the P port of the water valve 4 is disconnected from the A port, the water source is cut off, and the flushing action ends;

[0072] b. Part of the gas passes through the A port of the sixth pneumatic valve 7 as a control signal and enters the eighth pneumatic valve 10. After the eighth pneumatic valve 10 receives the control signal K, the P port is disconnected from the A port. The gas in the exhaust throttle valve 11 is restricted from the A port to the P port. The gas at the A port of the sixth pneumatic valve 7 passes through the P port of the quick exhaust valve 9 and enters the b port of the first pneumatic stop valve 12 from the A port. The a port of the first pneumatic stop valve 12 is slowly deflated through the exhaust throttle valve 11, so that the first pneumatic stop valve 12 is slowly opened. The sewage port 18b of the toilet 18 is connected with the b port of the sewage tank 19, so that the sewage in the toilet 18 is pumped into the sewage tank 19;

[0073] c. The gas enters the P port of the seventh pneumatic valve 8 through the A port of the sixth pneumatic valve 7. At this time, the P port of the seventh pneumatic valve 8 is disconnected from the A port. Part of the gas enters the second regulating valve 801 as the control signal K. The second regulating valve 801 will generate the control signal K when the set regulating time is reached. At this time, the seventh pneumatic valve 8 does not receive the control signal.

[0074] The execution time of pumping into the sewage tank 19 is about 2.5 to 3.5 seconds. When the sewage tank 19 is pumped into the program, the first pneumatic stop valve 12 is slowly opened, so that the pressure at the sewage outlet 18b of the toilet 18 is slowly increased, reducing the noise during the pumping. The internal flow channel diameter of the valve body 25 of the first pneumatic stop valve 12 is slowly increased, which can increase the initial speed of sewage flowing through the first pneumatic stop valve 12 and reduce the risk of dirt adhesion and jamming. At the same time, due to the throttling effect of the exhaust throttle valve 11, the noise when the pressure at the b port of the first pneumatic stop valve 12 is released through the R port of the eighth pneumatic valve 10 is reduced.

[0075] 4) Secondary flushing

[0076] a. After the second regulating valve 801 reaches the set regulating time, the seventh pneumatic valve 8 receives the control signal K, so that the P port of the seventh pneumatic valve 8 is connected to the A port, and the KL of the sixth pneumatic valve 7 receives the control signal, so that the P port of the sixth pneumatic valve 7 is connected to the B port, and the P port of the sixth pneumatic valve 7 is disconnected from the A port. At this time, the gas circuit is switched, and the rear end of the A port of the sixth pneumatic valve 7 is directly connected to the gas circuit to release the pressure through the R port of the sixth pneumatic valve 7;

[0077] b. At this time, the third pneumatic valve 3 loses the control signal K, and the third pneumatic valve 3 is reset to normal state, the P port of the third pneumatic valve 3 is connected with the A port, the water valve 4 receives the control signal K, and the water from the water source enters the toilet 18, realizing secondary flushing;

[0078] c. At this time, the eighth pneumatic valve 10 loses the control signal K, and the eighth pneumatic valve 10 is reset. The P port of the eighth pneumatic valve is connected to the A port, and the gas in the first pressure tank 21 enters the a port of the first pneumatic stop valve 12 through the exhaust throttle valve 11. The P port of the quick exhaust valve 9 does not get gas. The b port of the first pneumatic stop valve 12 is exhausted from the R port through the A port of the quick exhaust valve 9. The first pneumatic stop valve 12 is quickly closed, and the toilet 18 is disconnected from the sewage tank 19; the residual gas in the seventh pneumatic valve 8 is discharged into the atmosphere through the R port of the seventh pneumatic valve 8 to release the pressure;

[0079] 5) Sewage tank discharge

[0080] a. The gas enters the eleventh pneumatic valve 24 through the B port of the sixth pneumatic valve 7. After receiving the control signal K, the P port and the A port of the eleventh pneumatic valve 24 are connected. The gas in the second pressure tank 22 enters the a port of the sewage tank 19, and the pressure in the sewage tank 19 increases.

[0081] b. The gas enters the tenth pneumatic valve 15 through the B port of the sixth pneumatic valve 7. After the tenth pneumatic valve 15 receives the control signal K, the P port is disconnected from the A port. The gas in the first air intake throttle valve 14 and the second air intake throttle valve 16 is restricted from the P port to the A port. The a port of the second pneumatic stop valve 17 releases the gas through the second air intake throttle valve 16 and the R port of the tenth pneumatic valve 15. The gas enters the first air intake throttle valve 14 through the B port of the sixth pneumatic valve 7 and enters the b port of the second pneumatic stop valve 17, so that the second pneumatic stop valve 17 is slowly opened. The d port of the sewage tank 19 is connected to the sewage pipe 23, and the sewage is discharged from the sewage pipe 23 through the second pneumatic stop valve 17;

[0082] c. The gas passes through the B port of the sixth pneumatic valve 7 and reaches the P port of the ninth pneumatic valve 13. At this time, the P port of the ninth pneumatic valve 13 is disconnected from the A port, and the ninth pneumatic valve 13 is in a disconnected state. Part of the gas enters the third regulating valve 1301 as a control signal K, and the third regulating valve 1301 sets the regulating time and generates the control signal K. At this time, the ninth pneumatic valve 13 does not receive the control signal;

[0083] The execution time of sewage tank 19 discharge is about 2 to 3 seconds. When sewage is discharged, the first pneumatic stop valve 12 is quickly reset and closed, and the second pneumatic stop valve 17 is slowly opened at the same time, which can not only ensure that the sewage and air in the sewage tank 19 will not flow back through the first pneumatic stop valve 12, but also reduce the noise during sewage discharge. The b port of the first pneumatic stop valve 12 is quickly exhausted, and the flow channel of the valve body 25 of the first pneumatic stop valve 12 is quickly closed. At this time, the a port of the second pneumatic stop valve 17 is restricted by the first intake throttle valve 14 to slow the intake speed. The b port of the second pneumatic stop valve 17 is normally exhausted, and the flow channel of the valve body 25 of the second pneumatic stop valve 17 is slowly opened. The closing time of the first pneumatic stop valve 12 needs to be earlier than the full opening time of the second pneumatic stop valve 17. At the same time, the eleventh pneumatic valve 24 is conducted, and the pressure of the second pressure tank 22 enters the sewage tank 19 through the eleventh pneumatic valve 24. Since the pressure gas is transferred from high pressure to low pressure, the eighth pneumatic valve 10 has also been reset. The first pneumatic stop valve 12 is quickly closed, which can ensure that the low-pressure outlet at this time is only the flow channel of the second pneumatic stop valve 17, ensuring that the sewage and air in the sewage tank 19 will not flow back through the first pneumatic stop valve 12. When the pressure gas is released, it is easy to form noise at the low-pressure port. The second pneumatic stop valve 17 is slowly opened, so that the sewage tank 19 is in the pressurization process for a certain period of time, which can reduce the pressure difference between the a port of the sewage tank 19 and the second pressure tank 22, and reduce noise.

[0084] 6) Reset

[0085] a. After the third regulating valve 1301 reaches the set regulating time, the ninth pneumatic valve 13 receives the control signal K, the P port of the ninth pneumatic valve 13 is communicated with the A port, and the gas enters the KL port of the second pneumatic valve 2 through the A port of the ninth pneumatic valve 13, so that the P port of the second pneumatic valve 2 is disconnected from the A port, and the gas path directly connected to the rear end of the A port of the second pneumatic valve 2 releases the residual pressure through the R port of the second pneumatic valve 2, and the second pneumatic valve 2 is reset; at this time, the gas in the first pressure tank 21 does not pass through the second pneumatic valve 2, and the gas does not pass through the third pneumatic valve 3 to enter the water valve 4, the water valve is reset, and the water valve is disconnected, the fourth pneumatic valve 5 does not receive the control signal, and the fourth pneumatic valve 5 is reset, so that the vacuum tank 20 is connected with the C port of the sewage tank 19, the gas does not enter the fifth pneumatic valve 6, the gas does not enter the first regulating valve 601, the fifth pneumatic valve 6 loses the control signal, and the fifth pneumatic valve 6 is reset and disconnected;

[0086] b. At the same time, the gas enters the sixth pneumatic valve 7 through the A port of the ninth pneumatic valve 13, and the KR port of the sixth pneumatic valve 7 receives a control signal, and the sixth pneumatic valve 7 is reset to the point where the P port is in communication with the A port, and the switch is executed; at this time, although the P port and the A port of the sixth pneumatic valve 7 are in communication, there is no gas, and the eighth pneumatic valve 10 maintains the previous reset state, and the gas in the first pressure tank 21 enters the exhaust throttle valve 11 through the eighth pneumatic valve 10, and the gas enters the a port of the first pneumatic stop valve 12 through the exhaust throttle valve 11, so that the first pneumatic stop valve 12 is closed, and the toilet 18 is disconnected from the b port of the sewage tank 19;

[0087] c. At the same time, the tenth pneumatic valve 15 does not receive a control signal and is reset, and is in a conducting state. The gas in the first pressure tank 21 enters the second air intake throttle valve 16 through the tenth pneumatic valve 15, and the gas enters the a port of the second pneumatic stop valve 17 through the second air intake throttle valve 16, so that the second pneumatic stop valve 17 is reset and closed, and the d port of the sewage tank 19 is disconnected from the sewage pipe 23. At this point, the system returns to the 0 position state and the reset is completed.

[0088] When the system is reset, the first pneumatic stop valve 12 remains closed, and the second pneumatic stop valve 17 slowly closes due to the throttling restriction of the second air intake throttle valve 16 .

[0089] The control method has simple steps, which can not only adjust the speed of opening or closing the first pneumatic stop valve 12 and the second pneumatic stop valve 17, and reduce the noise of the toilet 18 during the suction and discharge process, but also play the role of air flow flushing the inner wall of the flow channel, preventing the risk of dirt adhesion and jamming, and improving the efficiency of sewage discharge. At the same time, it can ensure that the sewage and air in the sewage tank 19 will not flow back through the first pneumatic stop valve 12.

[0090] The pure mechanical pneumatic control logic actuator of the present invention specifically includes a first pneumatic stop valve 12, which is connected to a toilet 18 and a sewage tank 19 to control the sewage in the toilet 18 to enter the sewage tank 19; the first pneumatic stop valve 12 is connected to a pneumatic valve assembly through a quick exhaust valve 9 and an exhaust throttle valve 11, and the opening or closing of the first pneumatic stop valve 12 is controlled by the pneumatic valve assembly through the quick exhaust valve 9 and the exhaust throttle valve 11, which can increase the initial speed of sewage passing through the flow channel of the first pneumatic stop valve 12, reduce the risk of dirt adhesion and jamming, and at the same time, due to the effect of the exhaust throttle valve 11, reduce the noise when the pressure of the first pneumatic stop valve 12 is released. The quick exhaust valve 9 releases the gas into the atmosphere to achieve rapid exhaust of the port b of the first pneumatic stop valve 12, which is manifested as the valve body 25 of the first pneumatic stop valve 12 slowly opening and quickly closing.

[0091] A water spray port 18a is provided on the toilet 18, and the water spray port 18a is connected to a water source via a water valve 4, and the water valve 4 is connected to a pneumatic valve assembly. The switch of the water valve 4 can be controlled by the pneumatic valve assembly, so that water from the water source can flush the toilet 18 through the water spray port 18a.

[0092] A second pneumatic stop valve 17, which connects the sewage tank 19 and the sewage pipe 23, controls the sewage in the sewage tank 19 to be discharged through the sewage pipe 23; the second pneumatic stop valve 17 is connected to the pneumatic valve assembly through the first air intake throttle valve 14 and the second air intake throttle valve 16, and controls the opening or closing of the second pneumatic stop valve 17 through the pneumatic valve assembly through the first air intake throttle valve 14 and the second air intake throttle valve 16. The second pneumatic stop valve 17 opens slowly during sewage discharge, so that the sewage tank 19 is in the pressurization process for a certain period of time, and the pressure difference between the port a of the sewage tank 19 and the second pressure tank 22 can be reduced, thereby reducing noise. The first air intake throttle valve 14 and the second air intake throttle valve 16 are manifested as the valve body 25 of the second pneumatic stop valve 17 opening slowly and closing slowly.

[0093] The pneumatic valve assembly is used to control the on-off of the air circuit; the pneumatic valve assembly includes a mechanical valve 1, a second pneumatic valve 2, a third pneumatic valve 3, a fourth pneumatic valve 5, a fifth pneumatic valve 6, a sixth pneumatic valve 7, a seventh pneumatic valve 8, an eighth pneumatic valve 10, a ninth pneumatic valve 13, a tenth pneumatic valve 15 and an eleventh pneumatic valve 24, the first pressure tank 21 is connected to the mechanical valve 1, the second pneumatic valve 2, the eighth pneumatic valve 10 and the tenth pneumatic valve 15, the mechanical valve 1 is connected to the second pneumatic valve 2, the second pneumatic valve 2 is connected to the third pneumatic valve 3, the fourth pneumatic valve 5 and the fifth pneumatic valve 6, the vacuum tank 20 is connected to the sewage tank 19 via the fourth pneumatic valve 5, and the third pneumatic valve 3 is connected to the water valve 4, which is used to control the on-off of the water source to meet the flushing requirements of the toilet 18. The fifth pneumatic valve 6 is connected to the sixth pneumatic valve 7, and the fifth pneumatic valve 6 is connected to the first regulating valve 601, and the conduction time of the fifth pneumatic valve 6 can be adjusted through the first regulating valve 601. The A port of the sixth pneumatic valve 7 is connected to the seventh pneumatic valve 8, the third pneumatic valve 3 and the eighth pneumatic valve 10, the B port of the sixth pneumatic valve 7 is connected to the ninth pneumatic valve 13, the tenth pneumatic valve 15 and the eleventh pneumatic valve 24, the second pressure tank 22 is connected to the sewage tank 19 via the eleventh pneumatic valve 24, the seventh pneumatic valve 8 is connected to the second regulating valve 801, and the conduction time of the seventh pneumatic valve 8 can be adjusted by the second regulating valve 801. The ninth pneumatic valve 13 is connected to the third regulating valve 1301, and the conduction time of the ninth pneumatic valve 13 can be adjusted by the third regulating valve 1301. Through the design of the mechanical valve 1, the second pneumatic valve 2, the third pneumatic valve 3, the fourth pneumatic valve 5, the fifth pneumatic valve 6, the sixth pneumatic valve 7, the seventh pneumatic valve 8, the eighth pneumatic valve 10, the ninth pneumatic valve 13, the tenth pneumatic valve 15 and the eleventh pneumatic valve 24, the control of different working states of the toilet 18 can be realized, which is not only conducive to reducing the waste of water resources, but also flexible and convenient to control.

[0094] A vacuum tank 20 is used to perform vacuum compensation on the sewage tank 19; a first pressure tank 21 is used to provide a power source for the pneumatic valve assembly; and a second pressure tank 22 is used to inflate the sewage tank 19 to facilitate the discharge of sewage in the sewage tank 19; the first pressure tank 21 controls the first pneumatic stop valve 12 and the second pneumatic stop valve 17 through the pneumatic valve assembly to adjust the suction and discharge rate of the sewage tank 19; through the design of the above structure, not only can the speed of opening or closing the first pneumatic stop valve 12 and the second pneumatic stop valve 17 be adjusted to reduce the noise of the toilet 18 during the suction and discharge process, but also the airflow can play a role in flushing the inner wall of the flow channel, preventing the risk of dirt adhesion and jamming, and improving the efficiency of sewage discharge. At the same time, it can ensure that the sewage and air in the sewage tank 19 will not flow back through the first pneumatic stop valve 12.

[0095] The present invention has the following specific working steps:

[0096] 1. Set the exhaust throttle valve 11 to an opening of 80%, then the valve body flow channel of the first pneumatic stop valve 12 opens slowly, and the rate is 80% of the normal opening rate. Due to the action of the quick exhaust valve 9, the valve body flow channel of the first pneumatic stop valve 12 closes quickly; set the opening of the first intake throttle valve 14 and the second intake throttle valve 16 to 50%, then the second pneumatic stop valve 17 opens and closes slowly, and the rate is 50% of the normal opening rate.

[0097] 2. When the sewage pumping procedure is executed (execution time is 2.5 to 3.5 seconds), the second pneumatic stop valve 17 remains closed, the first pneumatic stop valve 12 is slowly opened at 80% rate, and the flow path inside the valve body of the first pneumatic stop valve 12 slowly increases. The control method at this time can increase the initial speed of sewage passing through the flow channel of the first pneumatic stop valve 12, reduce the risk of dirt adhesion and jamming, and at the same time, due to the throttling effect of the exhaust throttle valve 11, reduce the noise when the pressure at the port b of the first pneumatic stop valve 12 is released. The volume of the sewage tank 19 is set to a minimum of 10L, the vacuum is set to -70Kpa, the vacuum toilet 18 consumes 0.8L of water per time, and the feces volume is assumed to be 0.2L. When the pressure of the sewage tank 19 is 1 atmosphere, the sewage tank 19 inhales 1L of sewage and 6L of air from the outside.

[0098] 3. When the sewage discharge procedure is executed (the execution time is 2 to 3 seconds), the first pneumatic stop valve 12 is closed first, and then the second pneumatic stop valve 17 is opened immediately. At this time, the a port of the first pneumatic stop valve 12 is exhausted quickly, and the valve body flow channel of the first pneumatic stop valve 12 is quickly closed; at this time, the a port of the second pneumatic stop valve 17 is limited to a 50% rate of intake by the first intake throttle valve 14, and the b port of the second pneumatic stop valve 17 is exhausted normally, and the valve body flow channel of the second pneumatic stop valve 17 is slowly opened at a rate of 50%; the closing time point of the first pneumatic stop valve 12 is earlier than the opening time point of the second pneumatic stop valve 17, and at the same time, the eleventh pneumatic valve 24 is conducted, and the pressure of the second pressure tank 22 enters the sewage tank 19 through the eleventh pneumatic valve 24. Since the characteristic of pressurized gas is that high pressure transfers to low pressure, the first pneumatic stop valve 12 is closed earlier, which can ensure that the low-pressure outlet at this time is only the flow channel of the second pneumatic stop valve 17, ensuring that the sewage and air in the sewage tank 19 will not flow back through the first pneumatic stop valve 12. The pressure of the second pressure tank 22 is set to 350Kpa. When the pressurized gas is released, it is easy to generate noise at the low-pressure port. The second pneumatic stop valve 17 is opened slowly, so that the sewage tank 19 is in the pressurization process for a certain period of time, which can reduce the pressure difference between the port a of the sewage tank 19 and the second pressure tank 22, and reduce noise.

[0099] 4. When the discharge is completed and the system reset procedure is performed, the first pneumatic stop valve 12 remains closed, and the second pneumatic stop valve 17 slowly closes due to the throttling limit of the second air intake throttle valve 16.

[0100] Since the working time of the eleventh pneumatic valve 24 is limited, the gas entering the sewage tank 19 from the second pressure tank 22 is a relatively fixed volume. However, when the discharge procedure is executed, the gas in the sewage tank 19 is discharged to the sewage pipe 23 through the second pneumatic stop valve 17, and the air pressure in the sewage tank 19 is rapidly reduced.

[0101] After experimental testing, it was found that when the discharge program was executed for about 1.8±0.2 seconds, the sewage in the sewage tank 19 had been discharged. Within 1.9 to 2.5 seconds, the medium passing through the flow channel of the second pneumatic stop valve 17 was the residual pressure gas in the sewage tank 19. The slow closing of the flow channel of the second pneumatic stop valve 17 helped to increase the speed of the residual pressure gas in the sewage tank 19 passing through the flow channel of the second pneumatic stop valve 17, which played the role of airflow flushing the inner wall of the flow channel, reducing the risk of dirt adhesion and jamming, and increasing the service life of the second pneumatic stop valve 17.

[0102] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to achieve basically the same technical effects are all included in the protection scope of the present invention.

Claims

1. A control method for a pure mechanical pneumatic control logic actuator of a vacuum toilet, characterized in that The steps include: 1)0-bit state control a. The mechanical valve is normally closed and does not receive a control signal. At this time, the mechanical valve is disconnected and the second pneumatic valve has no signal; b. The eighth pneumatic valve is normally open, and the gas in the first pressure tank enters the exhaust throttle valve through the eighth pneumatic valve, and then enters the first pneumatic stop valve through the exhaust throttle valve, so that the first pneumatic stop valve is closed, and the toilet is disconnected from the sewage tank; c. The tenth pneumatic valve is normally open, and the gas in the first pressure tank enters the second air intake throttle valve through the tenth pneumatic valve, and the gas enters the second pneumatic stop valve through the second air intake throttle valve, so that the second pneumatic stop valve is closed, and the sewage tank is disconnected from the sewage pipe; d. The fourth pneumatic valve is normally open, and the vacuum tank is connected to the sewage tank; The first pneumatic stop valve and the second pneumatic stop valve each include a valve body, a cylinder, a rubber tube, a first clamping rod and a second clamping rod, the valve body is provided with a first pipe joint and a second pipe joint, the rubber tube is provided between the first pipe joint and the second pipe joint, the cylinder is movably connected to the valve body, the cylinder is connected to the first clamping rod via a piston rod, the second clamping rod is fixedly connected to the cylinder, and the first clamping rod and the second clamping rod are driven to move by the cylinder to achieve clamping or loosening of the rubber tube; 2) The system starts flushing once a. Press the button of the mechanical valve, the mechanical valve is opened, the gas passes through the mechanical valve and enters the second pneumatic valve, making the second pneumatic valve open, the gas in the first pressure tank passes through the second pneumatic valve and enters the fifth pneumatic valve, at this time the fifth pneumatic valve is in the disconnected state; b. Part of the gas passes through the second pneumatic valve and enters the first regulating valve as a control signal. The first regulating valve will generate a control signal when the set regulating time is reached; c. During the adjustment process of the first regulating valve, if the set adjustment time has not been reached, part of the gas enters the third pneumatic valve through the second pneumatic valve, the third pneumatic valve is normally open, and the gas enters the water valve through the third pneumatic valve, the water valve is normally in a closed state, and when the water valve receives a control signal, the water source enters the water outlet of the toilet through the water valve for flushing; d. The fourth pneumatic valve is normally open. When the gas in the first pressure tank enters the fourth pneumatic valve, the fourth pneumatic valve receives a control signal, the fourth pneumatic valve is disconnected, and the vacuum tank is disconnected from the sewage tank. At this time, the sewage tank maintains a vacuum negative pressure state; 3) Pumping in sewage tank a. After the first regulating valve reaches the set regulating time, the fifth pneumatic valve is opened after receiving the control signal, and the gas enters the sixth pneumatic valve through the fifth pneumatic valve. At this time, the sixth pneumatic valve is opened, the third pneumatic valve receives the control signal, and controls the third pneumatic valve to be disconnected. The water valve loses the control signal and is disconnected, the water source is cut off, and the flushing action ends; b. Part of the gas passes through the sixth pneumatic valve as a control signal and enters the eighth pneumatic valve. After receiving the control signal, the eighth pneumatic valve is disconnected, and the gas in the exhaust throttle valve is restricted. The gas in the sixth pneumatic valve passes through the quick exhaust valve and enters the first pneumatic stop valve. The first pneumatic stop valve slowly deflates through the exhaust throttle valve, so that the first pneumatic stop valve is slowly opened, and the sewage outlet of the toilet is connected to the sewage tank, so that the sewage in the toilet is pumped into the sewage tank; c. The gas enters the seventh pneumatic valve through the sixth pneumatic valve. At this time, the seventh pneumatic valve is disconnected, and part of the gas enters the second regulating valve as a control signal. The second regulating valve will generate a control signal when the set adjustment time is reached. At this time, the seventh pneumatic valve does not receive a control signal; 4) Secondary flushing a. After the second regulating valve reaches the set regulating time, the seventh pneumatic valve receives a control signal to conduct the seventh pneumatic valve, and the sixth pneumatic valve receives a control signal. At this time, the gas circuit is switched, and the gas circuit directly connected to the rear end of the sixth pneumatic valve releases pressure through the sixth pneumatic valve; b. At this time, the third pneumatic valve loses the control signal, the third pneumatic valve is reset to normal state, the third pneumatic valve is open, the water valve receives the control signal, the water from the water source enters the toilet, and the secondary flushing is realized; c. At this time, the eighth pneumatic valve loses the control signal, the eighth pneumatic valve is reset, the eighth pneumatic valve is open, the gas of the first pressure tank enters the first pneumatic stop valve through the exhaust throttle valve, the quick exhaust valve does not get gas, the first pneumatic stop valve is exhausted through the quick exhaust valve, and the first pneumatic stop valve is quickly Close, the toilet is disconnected from the sewage tank, and the residual gas in the seventh pneumatic valve is discharged into the atmosphere through the seventh pneumatic valve to release the pressure; 5) Sewage tank discharge a. The gas enters the eleventh pneumatic valve through the sixth pneumatic valve. After receiving the control signal, the eleventh pneumatic valve is opened, and the gas in the second pressure tank enters the sewage tank, and the pressure in the sewage tank increases; b. The gas enters the tenth pneumatic valve through the sixth pneumatic valve. The tenth pneumatic valve is disconnected after receiving the control signal. The gas in the first air intake throttle valve and the second air intake throttle valve is restricted. The second pneumatic stop valve releases the gas through the second air intake throttle valve and the tenth pneumatic valve. The gas enters the first air intake throttle valve through the sixth pneumatic valve and enters the second pneumatic stop valve, so that the second pneumatic stop valve is slowly opened, the sewage tank is connected to the sewage pipe, and the sewage is discharged from the sewage pipe through the second pneumatic stop valve; c. The gas passes through the sixth pneumatic valve to the ninth pneumatic valve. At this time, the ninth pneumatic valve is disconnected and in a disconnected state. Part of the gas enters the third regulating valve as a control signal. The third regulating valve sets the regulating time and generates a control signal. At this time, the ninth pneumatic valve does not receive a control signal. 6) Reset a. After the third regulating valve reaches the set regulating time, the ninth pneumatic valve receives a control signal, the ninth pneumatic valve is opened, and the gas enters the second pneumatic valve through the ninth pneumatic valve, so that the second pneumatic valve is disconnected and reset; b. At the same time, the gas passes through the ninth pneumatic valve and enters the sixth pneumatic valve. The sixth pneumatic valve receives a control signal and resets to the on state, executing the switch; c. At the same time, the tenth pneumatic valve does not receive a control signal and is reset, and is in a conducting state. The gas in the first pressure tank enters the second air intake throttle valve through the tenth pneumatic valve, and the gas enters the second pneumatic stop valve through the second air intake throttle valve, so that the second pneumatic stop valve is reset and closed, and the sewage tank is disconnected from the sewage pipe; At this point, the system returns to the 0-bit state and the reset is completed.

2. The control method of a pure mechanical pneumatic control logic actuator of a vacuum toilet according to claim 1, characterized in that: The execution time of step 3) pumping the sewage tank into the sewage tank is 2.5 to 3.5 seconds.

3. The control method of a pure mechanical pneumatic control logic actuator of a vacuum toilet according to claim 2, characterized in that: When the sewage tank is pumped into the procedure, the first pneumatic stop valve is slowly opened.

4. The control method of a pure mechanical pneumatic control logic actuator of a vacuum toilet according to claim 1, characterized in that: Step 5) The execution time of sewage tank discharge is 2 to 3 seconds.

5. The control method of a pure mechanical pneumatic control logic actuator of a vacuum toilet according to claim 4, characterized in that: When sewage is discharged, the first pneumatic stop valve is quickly reset and closed, and the second pneumatic stop valve is slowly opened at the same time.

6. The control method of a pure mechanical pneumatic control logic actuator of a vacuum toilet according to claim 1, characterized in that: When the system is reset in step 6), the first pneumatic stop valve remains closed, and the second pneumatic stop valve slowly closes due to the throttling restriction of the second air intake throttle valve.

7. The control method of a pure mechanical pneumatic control logic actuator of a vacuum toilet according to claim 1, characterized in that: Step 6) When the second pneumatic valve is disconnected and reset in process a, the gas in the first pressure tank does not pass through the second pneumatic valve, the gas does not enter the water valve through the third pneumatic valve, the water valve is reset, the water valve is disconnected, the fourth pneumatic valve does not receive a control signal, the fourth pneumatic valve is reset, so that the vacuum tank is connected to the sewage tank, the gas does not enter the fifth pneumatic valve, the gas does not enter the first regulating valve, the fifth pneumatic valve loses the control signal, and the fifth pneumatic valve is reset and disconnected.

8. The control method of a pure mechanical pneumatic control logic actuator of a vacuum toilet according to claim 1, characterized in that: Step 6) The sixth pneumatic valve described in process b executes switching. At this time, the eighth pneumatic valve maintains the previous reset state. The gas in the first pressure tank enters the exhaust throttle valve through the eighth pneumatic valve. The gas enters the first pneumatic stop valve through the exhaust throttle valve, so that the first pneumatic stop valve is closed, and the toilet is disconnected from the sewage tank.

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