CN108131481B - Rotary pneumatic control valve and pneumatic control system thereof - Google Patents
Rotary pneumatic control valve and pneumatic control system thereof Download PDFInfo
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- CN108131481B CN108131481B CN201810096562.9A CN201810096562A CN108131481B CN 108131481 B CN108131481 B CN 108131481B CN 201810096562 A CN201810096562 A CN 201810096562A CN 108131481 B CN108131481 B CN 108131481B
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- 238000007789 sealing Methods 0.000 claims abstract description 92
- 238000004891 communication Methods 0.000 claims description 16
- 230000033001 locomotion Effects 0.000 claims description 9
- 230000006698 induction Effects 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000001939 inductive effect Effects 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 11
- 230000009471 action Effects 0.000 description 10
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000002955 isolation Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000010365 information processing Effects 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 239000000565 sealant Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001141 propulsive effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035899 viability Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K24/00—Devices, e.g. valves, for venting or aerating enclosures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
- F16K31/363—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor the fluid acting on a piston
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- Multiple-Way Valves (AREA)
Abstract
The invention discloses a rotary pneumatic control valve which is characterized by comprising a pneumatic control valve body, wherein at least one cavity is arranged in the pneumatic control valve body, and a push rod block capable of reciprocating in the cavity is arranged in the cavity; the cavity comprises a front cavity, a sealing chamber and a rear cavity which are sequentially communicated, and an airtight channel is communicated between the sealing chamber and the rear cavity; a central shaft block capable of rotating relative to the pneumatic control valve body is arranged in the shell, and an air flow channel is arranged in the central shaft block; a first air passage is communicated between the air flow passage and the sealing chamber; a second air passage is communicated between the rear cavity and the air passage; the rear cavity is communicated with the outside air and is provided with a third air passage; the pneumatic control valve body is internally provided with an exhaust port communicated to the outside, and a fourth air passage is communicated between the exhaust port and the front cavity. The invention also discloses a pneumatic control system formed by combining the rotary pneumatic control valve. The invention has the advantages of high stability, simple structure and convenient maintenance.
Description
Technical Field
The invention relates to the field of automobiles, in particular to an automobile tire inflation and deflation technology, and specifically relates to a rotary pneumatic control valve and a pneumatic control system thereof.
Background
The automobile tyre inflating and deflating system is one set of automobile tyre pressure regulating system comprising pneumatic control system and sensor. The main functions of the device are as follows: when an automobile passes through soft ground such as desert, coastal beach, swamps, muddy lands and the like and ice and snow road surfaces, the system can rapidly reduce the tire pressure and increase the grounding area of the tire; on one hand, the sinking amount of the tire and the soil resistance are reduced; on the other hand, as the number of patterns of the tire embedded in the soil is increased, the propulsive force of the soil is increased, the traction force is greatly increased, and the trafficability of the automobile is improved.
When the height of the carrier is limited by bridge hole, culvert and cabin door, if the tyre pressure is reduced, the total height of the car can be reduced in a certain range, so that the car can pass smoothly.
When the road surface environment temperature is higher and the automobile continuously runs for a long distance, the pressure in the tire is increased due to the heating of the tire, the tire burst can be caused, and if the automobile tire in the running process can be deflated in real time, the dangerous situation can be avoided
When the military cross-country vehicle is used for conveying weaponry, vehicle-mounted weapon systems, communication command systems and war field wounded persons, if the tire air pressure can be adjusted in real time according to different road conditions to slow down impact and vibration, the maneuverability, safety and viability of the military need can be enhanced.
It is well known that such pneumatic control systems for controlling inflation and deflation of tires are commonly used on large trucks or military trucks, i.e. a group of tires having two tires. The existing pneumatic control system for controlling inflation and deflation of tires comprises a pneumatic control valve and a pneumatic control device, wherein the pneumatic control valve only has a single exhaust port, namely one exhaust port is shared by two tires, and the sensing device is arranged on a shared air passage and used for sensing tire pressure. In the actual use process, only two tires can be inflated and deflated simultaneously when being inflated and deflated, the inflation and deflation can not be carried out according to different tire pressures of different tires, and the sensing device can accurately measure the tire pressures only under the condition that the two tires are not damaged. In addition, the existing sensing device can manually control the external steam supply equipment to give short pulse air flow to open the pneumatic control assembly in the pneumatic control valve under the condition that the vehicle is stopped at each time, so that detection is performed. And the existing induction device is installed by adopting a knob, the manufacturing of the knob induction device is very easy to cause the damage of an induction part, and the technology is complex and the cost is high.
In the actual use process, the tire sensing device is easy to break down due to long-time running of the vehicle or uneven road surface, so that the sensing device is out of order, and inconvenience or potential safety hazard is caused to a driver. In particular, under the battle condition, due to the failure of the sensing device, a driver cannot correctly inflate and deflate the tire, so that the military vehicle cannot timely adjust the air pressure of the tire to adapt to the battle field environment, and the fighter is musied or casualties are caused.
In addition, when the damage of certain parts in the pneumatic control valve probably influences the use of whole pneumatic control system, often need dismantle whole pneumatic control valve, change the inside part, and not only maintenance time is long like this, and the degree of difficulty is big, and the processing degree of difficulty of supplying spare part is big moreover, and interchangeability is poor, causes the supply inconvenience of spare part.
In summary, the existing pneumatic control system is inconvenient to operate, poor in stability, high in manufacturing cost and incapable of accurately inflating and deflating. The demands of people cannot be met.
Therefore, a novel system for inflating and deflating the automobile tire, namely a pneumatic control system, needs to be developed
Disclosure of Invention
The invention aims to provide a rotary pneumatic control valve with a reliable sensing device, convenient replacement, controllable spare part precision, strong interchangeability, convenient accurate maintenance and low manufacturing cost, and a pneumatic control system formed by matching with the rotary pneumatic control valve
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the rotary pneumatic control valve is characterized by comprising a pneumatic control valve body, wherein at least one cavity is formed in the pneumatic control valve body, and a push rod block capable of reciprocating in the cavity is arranged in the cavity; the cavity comprises a front cavity, a sealing chamber and a rear cavity which are sequentially communicated, and an airtight channel is communicated between the sealing chamber and the rear cavity; the push rod block passes through the airtight channel and forms airtight fit with the airtight channel; one end of the push rod block extends into the front cavity and isolates the front cavity from the sealing chamber, and the other end of the push rod block extends into the rear cavity and isolates the rear cavity from the airtight channel; a central shaft block which can rotate relative to the pneumatic control valve body is arranged in the pneumatic control valve body; the rotation axis of the middle shaft block is parallel to the moving direction of the push rod block; an air flow channel is arranged in the middle shaft block; a first air passage is communicated between the air flow passage and the sealing chamber; a second air passage is communicated between the rear cavity and the air passage; the rear cavity is communicated with the outside air and is provided with a third air passage; the pneumatic control valve body is internally provided with an exhaust port communicated to the outside, and a fourth air passage is communicated between the exhaust port and the front cavity.
The working principle of the invention is as follows:
when the tire is inflated, the pneumatic control device starts a gas supply flow, gas is input through a gas flow channel in the center shaft block, the gas enters the rear cavity from the second gas channel, the pressure in the rear cavity is continuously increased, the push rod block moves towards the front cavity under the action of the gas pressure, at the moment, one end, provided with the isolation front cavity and the sealing cavity, of the push rod block moves towards the inside of the front cavity, and the front cavity and the sealing cavity are communicated immediately; the front chamber is quickly filled with the air flow in the first air passage, then the air flows to the fourth air passage communicated between the air outlet and the front chamber, and then the air is discharged from the air outlet and conveyed into the tire. And then the chamber keeps ventilation with the outside through the third air passage, so that air trapping is avoided, and the push rod block can move at any time.
When the inflation is finished, the air control device rapidly exhausts, the air pressure in the first air passage and the air pressure in the second air passage are respectively zero, the air pressure in the rear cavity is zero, and the residual gas in the front cavity moves the push rod block to the rear cavity until the push rod block returns to the original position.
When the tire is deflated, the pneumatic control device starts the deflation flow, firstly the pneumatic control device gives pulse airflow for pushing the push rod block to move towards the front cavity, the air is input through the airflow channel in the center shaft block, then the air enters the sealing chamber along the first airflow channel, then the air enters the rear cavity along the second airflow channel, the pressure in the rear cavity is continuously increased, the push rod block moves towards the front cavity under the action of air pressure, at the moment, one end, provided with the isolation front cavity and the sealing chamber, of the push rod block moves towards the inside of the front cavity, and the front cavity and the sealing chamber are communicated. The gas then returns along the path of the inlet air, i.e. the gas in the tyre is fed in from the exhaust port, into the fourth air duct and into the front chamber. Since the rear chamber also has pressure at this time, the front chamber and the sealing chamber are always in communication; immediately, the gas flows from the front chamber to the sealing chamber, and the sealing chamber is rapidly filled with the gas and is sent to the first gas channel to be discharged to the gas flow channel in the middle shaft block; and meanwhile, the gas of the rear chamber flows to the second channel and is conveyed to the gas flow channel of the center shaft block, and finally, the gas is output to the pneumatic control device from the gas flow channel of the center shaft block, so that the deflation of the tire is realized.
When the air release is finished, the air control device rapidly discharges air, the air pressure in the first air passage and the air pressure in the second air passage are respectively zero, the air pressure in the rear cavity is zero, and the residual air in the front cavity moves the push rod block to the rear cavity until the push rod block returns to the original position.
The original position refers to the position of the push rod block, namely the front chamber is isolated from the sealing chamber, and the sealing chamber is in air flow communication with the rear chamber through an airtight channel when the external air supply equipment is not inflated and not deflated.
In order to fix the position of the pusher block and limit the movement path thereof, it is preferable that an elastic assembly is further provided between the end of the pusher block and the front chamber; one end of the elastic component is connected with the inner wall of the front cavity, and the other end of the elastic component is connected with the end part of the push rod block.
In order to ensure air tightness and reciprocating motion of the push rod block, preferably, the push rod block comprises a push rod body, one end of the push rod body extends along the central axis of the push rod body to form a convex block, and the other end extends to the circumferential direction to form an extension block; the convex block is connected with a sealing block, and the sealing block covers the opening of the sealing chamber facing the front chamber; the epitaxial block is connected with a sealing gasket for isolating the rear cavity from the airtight channel.
In order to enable a driver to timely know the air pressure of the tire and realize automatic inflation and deflation of the tire and convenient maintenance, the air control valve body is preferably provided with a sensing air passage used for communicating the front cavity with the outside, and a first sensing device capable of sensing the air pressure of the front cavity is arranged at an opening of the sensing air passage facing the outside; the first sensing device is positioned at the periphery of the pneumatic control valve body; the fourth air passage is oriented in accordance with the exhaust port.
In order to reduce machining links, facilitate mass production and maintenance, and the single valve assembly process is reasonable, the assembly is good and the yield is high, preferably, the pneumatic control valve body is in a split design, and the split direction of the pneumatic control valve body is parallel to the moving direction of the push rod block; the pneumatic control valve body comprises a first plate, a second plate and a third plate which are sequentially overlapped; the rear cavity is positioned in a space formed by overlapping the first plate and the second plate; the sealing chamber and the fourth air passage are positioned in the second plate; the exhaust port is positioned on the side surface of the second plate; the front cavity is positioned in a space formed by overlapping the second plate and the third plate; the first sensing device is positioned on the side face of the third plate.
The peripheral side refers to the side surface of the pneumatic control valve body, which surrounds the center shaft block rotation axis for a circle.
The splitting direction refers to the action direction of splitting each component when the pneumatic control valve body is split.
The rotary pneumatic control valve has the advantages of simple structure, easy machining, convenient maintenance and low manufacturing cost.
The pneumatic control system is characterized by comprising a plurality of rotary pneumatic control valves and a pneumatic control device for controlling air inlet and air exhaust; the rotary pneumatic control valve comprises a pneumatic control valve body, wherein at least one cavity is formed in the pneumatic control valve body, and a push rod block capable of reciprocating in the cavity is arranged in the cavity; the cavity comprises a front cavity, a sealing chamber and a rear cavity which are sequentially communicated, and an airtight channel is communicated between the sealing chamber and the rear cavity; the push rod block passes through the airtight channel and forms airtight fit with the airtight channel; one end of the push rod block extends into the front cavity and isolates the front cavity from the sealing chamber, and the other end of the push rod block extends into the rear cavity and isolates the rear cavity from the airtight channel; a central shaft block which can rotate relative to the pneumatic control valve body is arranged in the pneumatic control valve body; the rotation axis of the middle shaft block is parallel to the moving direction of the push rod block; an air flow channel is arranged in the middle shaft block; a first air passage is communicated between the air flow passage and the sealing chamber; a second air passage is communicated between the rear cavity and the air passage; the rear cavity is communicated with the outside air and is provided with a third air passage; an exhaust port communicated with the outside is also arranged in the pneumatic control valve body, and a fourth air passage is communicated between the exhaust port and the front cavity; the pneumatic control device comprises a bracket; the support is provided with a main air passage and an exhaust passage; the main air passage is provided with an air inlet communicated with the rotary pneumatic control valve; the exhaust passage is communicated with the outside air; the bracket is also provided with a first normally-closed valve, a second normally-closed valve and a normally-open valve; one end of the normally open valve is communicated with the main air passage, and the other end of the normally open valve is communicated with the exhaust passage; one end of the first normally-closed valve is communicated with the main air passage, and the other end of the first normally-closed valve is communicated with the exhaust passage; one end of the second normally closed valve is communicated with the main air passage, and the other end of the second normally closed valve is provided with an air delivery port connected with the output end of external air supply equipment.
When the tire is inflated, the normally open valve and the second normally closed valve of the pneumatic control device are powered on, the normally open valve is powered on, the second normally closed valve is powered on, the valve is opened, the first normally closed valve is not started, and then the external air supply equipment supplies air to the pneumatic control device, namely, the air is input from the air conveying port; further, the gas flows through the second normally closed valve and then to the main gas passage; finally, the air flows out from an air inlet on the main air passage and is conveyed to the rotary pneumatic control valve; further, the gas is input through the gas flow channel in the middle shaft block, the gas enters the rear cavity from the second gas channel, the pressure in the rear cavity is continuously increased, the push rod block moves towards the front cavity under the action of the gas pressure, at the moment, one end, provided with the isolation front cavity and the sealing cavity, of the push rod block moves towards the inside of the front cavity, and the front cavity and the sealing cavity are communicated immediately; the front chamber is quickly filled with the air flow in the first air passage, then the air flows to the fourth air passage communicated between the air outlet and the front chamber, and then the air is discharged from the air outlet and conveyed into the tire. And then the chamber keeps ventilation with the outside through the third air passage, so that air trapping is avoided, and the push rod block can move at any time.
When the air charging is finished, the external air supply equipment stops supplying air, the normally open valve and the second normally closed valve of the air control device are powered off, the normally open valve is powered off, the second normally closed valve is powered off, the valve is closed, the first normally closed valve is not started, namely the air control device rapidly exhausts air, the air pressure in the first air passage and the air pressure in the second air passage are respectively zero, the air pressure in the rear cavity is zero, and the residual air in the front cavity moves the push rod block to the rear cavity until the push rod block returns to the original position. Wherein, because the normally open valve is a large-capacity valve, the quick deflation can be realized.
When the tire is deflated, firstly, the normally open valve and the second normally closed valve of the pneumatic control device are electrified in a pulse mode, the normally open valve is electrified and closed, the valve is opened in a pulse mode, the first normally closed valve is not started, and then the external air supply equipment inputs pulse air flow to the pneumatic control device, namely, air is input from the air conveying port; further, the gas flows through the second normally closed valve and then to the main gas passage; finally, the air flows out from an air inlet on the main air passage and flows to the rotary pneumatic control valve; the air control device starts the deflation flow, the pulse air flow pushes the push rod block to move towards the front cavity, air is input through the air flow channel in the middle shaft block, then the air enters the sealing chamber along the first air channel, then the air enters the rear cavity along the second air channel, the pressure in the rear cavity is continuously increased, the push rod block moves towards the front cavity under the action of air pressure, at the moment, one end, provided with the isolation front cavity and the sealing chamber, of the push rod block moves towards the inside of the front cavity, and the front cavity and the sealing chamber are communicated immediately.
At the moment, the normally open valve and the first normally closed valve of the pneumatic control device are electrified, the normally open valve is electrified to close the valve, the first normally closed valve is electrified to open the valve, and the second normally closed valve is not started; the first normally closed valve is communicated with the exhaust passage, and then the gas returns along the path of the air inlet in a primary way, namely the gas in the tire is input from the exhaust port, enters the fourth air passage and enters the front chamber. Since the rear chamber also has pressure at this time, the front chamber and the sealing chamber are always in communication; immediately, the gas flows from the front chamber to the sealing chamber, and the sealing chamber is rapidly filled with the gas and is sent to the first gas channel to be discharged to the gas flow channel in the middle shaft block; meanwhile, the gas of the rear cavity flows to the second channel and is conveyed to the gas flow channel of the middle shaft block, and finally, the gas is output to the gas inlet of the pneumatic control device from the gas flow channel of the middle shaft block, flows to the main gas channel, flows to the first normally closed valve and is finally discharged out of the pneumatic control device; thus achieving deflation of the tire.
When the deflation is finished, the normally open valve and the first normally closed valve of the pneumatic control device are powered off, the normally open valve is powered off to open the valve, the first normally closed valve is powered off to close the valve, the second normally closed valve is not started, namely the pneumatic control device rapidly exhausts, the air pressure in the first air passage and the air pressure in the second air passage are respectively zero, the air pressure in the rear cavity is zero, and the residual air in the front cavity moves the push rod block towards the rear cavity until the push rod block returns to the original position.
In the pneumatic control system, in order to enable a driver to know the air pressure of the tire in time and achieve automatic inflation and deflation of the tire and convenient maintenance, a sensing air passage used for communicating a front cavity with the outside is arranged on the pneumatic control valve body in the rotary pneumatic control valve, and a first sensing device capable of sensing the air pressure of the front cavity is arranged at an opening of the sensing air passage towards the outside.
In order to ensure that the air control device accurately senses the air pressure of the air inlet and the air delivery opening, the bracket is preferably also provided with a second sensing device and a third sensing device; the second sensing device is positioned at the communication position between the second normally closed valve and the gas transmission port; the third sensing device is positioned at the communication position between the air inlet and the main air passage.
In the pneumatic control system, in order to fix the position of the push rod block and limit the movement path of the push rod block, an elastic component is arranged between the end part of the push rod block and the front cavity in the rotary pneumatic control valve; one end of the elastic component is connected with the inner wall of the front cavity, and the other end of the elastic component is connected with the end part of the push rod block.
In the pneumatic control system, in order to ensure air tightness and reciprocating motion of the push rod block, the push rod block is arranged in the rotary pneumatic control valve; the push rod block comprises a push rod body, one end of the push rod body extends along the central axis of the push rod body to form a convex block, and the other end extends to the circumferential direction to form an extension block; the convex block is connected with a sealing block, and the sealing block covers the opening of the sealing chamber facing the front chamber; the epitaxial block is connected with a sealing gasket for isolating the rear cavity from the airtight channel.
In the pneumatic control system, in order to reduce machining links, facilitate mass production and maintenance, and the single valve assembly process is reasonable, the assembly is good and the yield is high, a pneumatic control valve body is arranged in the rotary pneumatic control valve; the pneumatic control valve body is in a split type design, and the split direction of the pneumatic control valve body is parallel to the moving direction of the push rod block; the pneumatic control valve body; comprises a first plate, a second plate and a third plate which are sequentially overlapped; the rear cavity is positioned in a space formed by overlapping the first plate and the second plate; the sealing chamber and the fourth air passage are positioned in the second plate; the exhaust port is positioned on the side surface of the second plate; the front cavity is positioned in a space formed by overlapping the second plate and the third plate; the first sensing device is positioned on the side face of the third plate.
The splitting direction refers to the action direction of splitting each component when the pneumatic control valve body is split.
The invention has the advantages of high stability, simple structure, convenient maintenance and strong practicability.
Drawings
FIG. 1 is a bottom view of a rotary pneumatic valve of embodiment 1 of the present invention;
FIG. 2 is a schematic cross-sectional view A-A of FIG. 1;
FIG. 3 is a schematic cross-sectional view of B-B of FIG. 1;
FIG. 4 is a partial schematic view of C of FIG. 3;
FIG. 5 is a partial schematic view of D of FIG. 3;
FIG. 6 is a schematic structural view of a rotary pneumatic valve in embodiment 1 of the present invention;
FIG. 7 is a top view of the pneumatic control device in embodiment 2 of the present invention;
FIG. 8 is a schematic cross-sectional E-E of FIG. 7;
fig. 9 is a front view of the air control device in embodiment 2 of the present invention;
FIG. 10 is a schematic cross-sectional F-F view of FIG. 9;
FIG. 11 is a schematic view showing the structure of a pneumatic control device in embodiment 2 of the present invention;
fig. 12 is an assembly view of the pneumatic control system in embodiment 2 of the present invention.
Reference numerals illustrate: 1-a pneumatic control valve body; 2-air flow channels; 3-a middle shaft block; 4-a first airway; 5-a second airway; 6-a third airway; 7-fourth airway; 8-sealing the chamber; 9-a spring; 10-a pre-chamber; 11-a rear chamber; 12-exhaust port; 13-a pushrod block; 14-projecting blocks; 15-an epitaxial block; 16-airtight channels; 17-a gasket; 18-a sealing ring; 19-sealing glue; 20-sealing blocks; 21-a first induction device; 22-a first plate; 23-a second plate; 24-a third plate; 25-bolts; 26-exhaust passage; 27-a bracket; 28-main airway; 29-air inlet; 30-a first normally closed valve; 31-a second normally closed valve; 32-a normally open valve; 33-gas transfer ports; 34-a second sensing device; 35-a third sensing device; 36-public air duct.
Detailed Description
The invention will be further described with reference to the drawings and examples.
Example 1
The rotary pneumatic control valve as described in fig. 1-6 comprises a pneumatic control valve body 1, wherein 2 cavities are arranged in the pneumatic control valve body, a public air passage 36 connected with the 2 cavities is arranged in the pneumatic control valve body, and a central shaft block 3 is communicated with the public air passage 36.
As shown in fig. 1 to 5, a push rod block 13 capable of reciprocating in the cavity is arranged in the cavity; the cavity comprises a front cavity 10, a sealing chamber 8 and a rear cavity 11 which are sequentially communicated, and an airtight channel 16 is communicated between the sealing chamber 8 and the rear cavity 11; the push rod block 13 passes through the airtight passage 16 and forms airtight fit with the airtight passage 16; one end of the push rod block 13 extends into the front chamber 10 and isolates the front chamber 10 from the sealing chamber 8, and the other end of the push rod block 13 extends into the rear chamber 11 and isolates the rear chamber 11 from the airtight channel 16; a central shaft block 3 which can rotate relative to the pneumatic control valve body is arranged in the pneumatic control valve body 1, and the central axis of the central shaft block 3 is parallel to the movement direction of the push rod block 13; an air flow channel 2 is arranged in the middle shaft block 3; a first air passage 4 is communicated between the air passage 2 and the sealing chamber 8; a second air passage 5 is communicated between the rear chamber 11 and the air flow passage 2; the rear chamber 11 is communicated with the outside air and is provided with a third air passage 6; the air control valve body 1 is also internally provided with an exhaust port 12 communicated to the outside, a fourth air passage 7 is communicated between the exhaust port 12 and the front cavity 10, and the direction of the fourth air passage 7 is consistent with the direction of the exhaust port 12.
As shown in fig. 2, the push rod block 13 in the present embodiment 1 includes a push rod body, one end of which extends along the central axis of the push rod body to form a convex block 14, and the other end extends circumferentially to form an extension block 15; the convex block 14 is connected with a sealing block 20, and the sealing block 20 covers the opening of the sealing chamber 8 facing the front chamber 10; the epitaxial block 15 is connected with a gasket 17 for isolating the rear chamber 11 from the airtight passage 16; in order to ensure air tightness, a sealing ring 18 is arranged at the joint of the sealing block 20 and the sealing chamber 8; the joint of the rear chamber 11 and the airtight channel 16 is provided with sealant 19; the sealing block 20 is located at the joint of the front cavity 10 and the sealing chamber 8, is of a circular cover body structure and is tightly attached to the joint, so that good sealing is formed.
In addition, a spring 9 (i.e., an elastic component) is also arranged between the end of the push rod block 13 and the front chamber 10; one end of the spring 9 is connected with the inner wall of the front chamber 10, and the other end is connected with the end of the push rod block 13. The purpose is to fix the position of the pusher block 13 and prevent displacement.
Wherein, the pneumatic control valve body 1 shown in fig. 6 adopts a split design, and the split direction of the pneumatic control valve body 1 is parallel to the moving direction of the push rod block 13; the pneumatic control valve body 1 comprises a first plate 22, a second plate 23 and a third plate 24 which are sequentially overlapped, and is provided with 8 through holes which sequentially penetrate through the first plate 22 and the second plate 23 and extend to the third plate 24, wherein threads matched with bolts 25 are arranged in the through holes on the third plate 24; the pneumatic control valve body 1 further comprises 8 bolts 25 for connecting and fixing the first plate 22, the second plate 23 and the third plate 24; the bolts 25 are sleeved in the inner holes of the through holes, and the three plates are connected and fixed through thread lines in threaded holes on the third plate 24; the rear chamber 11 is positioned in a closed space formed by overlapping the first plate 22 and the second plate 23; the sealing chamber 8 and the fourth air passage 7 are positioned on the second plate 23; the exhaust port 12 is located on the side of the second plate 23; the front chamber 10 is positioned in a closed space formed by overlapping the second plate 23 and the third plate 24; the first sensing means 21 are located at the side of the third plate 24. So that during maintenance or overhaul, the first plate 22 can be taken out and the problem can be checked by directly disassembling 25; and the second plate 23 can be directly taken out, and the second plate 23 can simultaneously bring out the push rod block 13, so that the maintenance is convenient. Furthermore, the detachable bolt 25 is fixedly connected, and is convenient to assemble when a large aluminum cover is arranged as a support.
Embodiment 1 further includes a control system; the control system comprises a data processing module and an information processing module, a sensing air passage used for communicating the front cavity 10 with the outside is arranged on the air control valve body 1, and a first sensing device 21 capable of sensing the air pressure of the front cavity 10 is arranged at an opening of the sensing air passage towards the outside. The first sensing device 21 is in communication connection with the data processing module and the information processing module, respectively. So that the driver can know the air pressure of the tire in time and realize the automatic inflation and deflation of the tire. The first sensing device is located on the side face of the pneumatic control valve body and is arranged along the direction of the exhaust port, so that the pneumatic control valve is greatly convenient to maintain.
The rotary pneumatic valve of this embodiment 1 operates as follows:
when the tire is inflated, the pneumatic control device starts to supply air, the air is input through the air flow channel 2 in the center shaft block 3, the air enters the rear cavity 11 from the second air channel 2, the pressure in the rear cavity 11 is continuously increased, and the push rod block 13 moves towards the front cavity 10 under the action of air pressure; i.e. the end of the pusher block 13 provided with the sealing chamber 8 and the front chamber 10 is moved towards the front chamber 10, the front chamber 10 and the sealing chamber 8 are then communicated, and the air flow in the first air passage 4 rapidly fills the front chamber 10, then the air flows to the fourth air passage 7 communicated between the air outlet 12 and the front chamber 10, and then the air is discharged from the air outlet 12 and conveyed into the tyre. The chamber 11 is then kept ventilated with the outside through the third air duct 6, avoiding trapping air and ensuring the movement of the pusher block 13.
Wherein, when the pusher block 13 moves toward the front chamber 10, the extension block 15 of the pusher block 13 is contacted with the sealant 19, thereby isolating the communication between the sealing chamber 8 and the rear chamber 11.
When the inflation is completed, the air control device rapidly exhausts, and then the air pressure of the first air passage 4 and the air pressure of the second air passage 5 are respectively zero, and meanwhile, the air pressure in the rear chamber 11 is zero, and the residual air in the front chamber 10 moves the push rod block 13 to the rear chamber 11 until the push rod block returns to the original position.
When the tire is deflated, the pneumatic control device starts the deflation flow, pulse gas is given, the gas is input through the gas flow channel 2 in the center shaft block 3, then the gas enters the sealing chamber 8 along the first gas channel 4, then the gas enters the rear chamber 11 along the second gas channel 5, the pressure in the rear chamber 11 continuously increases, the push rod block 13 moves towards the front chamber 10 under the action of air pressure, at the moment, one end, provided with the isolation front chamber 10 and the sealing chamber 8, of the push rod block 13 moves towards the inside of the front chamber 10, and the front chamber 10 and the sealing chamber 8 are communicated. The gas then returns along the path of the inlet air, i.e. the gas in the tyre is fed in from the exhaust port 12, into the fourth air duct 7 and into the front chamber 10. Since at this point the rear chamber 11 is still under pressure, the front chamber 10 and the sealing chamber 8 are always in communication; thereupon, the gas flows from the front chamber 10 to the seal chamber 8, and the seal chamber 8 is rapidly filled with gas and is sent to the first gas passage 4 to be discharged to the gas flow passage 2 in the center block 3; at the same time, the gas of the rear chamber 11 flows to the second channel 5 and is conveyed to the gas flow channel 2 of the center shaft block 3, and finally, the gas is output from the gas flow channel 2 of the center shaft block 3 to the pneumatic control device. The deflation of the tire is realized.
When the deflation is completed, the air control device rapidly exhausts, and then the air pressure of the first air passage 4 and the air pressure of the second air passage 5 are respectively zero, and meanwhile, the air pressure in the rear chamber 11 is zero, and the residual air in the front chamber 10 moves the push rod block 13 to the rear chamber 11 until the push rod block returns to the original position.
In the process of inflation and deflation, in order to enable a driver to know the air pressure of the tire in time and realize automatic inflation and deflation of the tire, a first sensing device 21 capable of sensing the air pressure of the front chamber 10 is arranged at an opening of the air passage towards the outside. The first sensing device 21 is in communication connection with the data processing module and the information processing module, respectively.
Example 2:
a pneumatic control system as described in fig. 1 to 12 comprising 4 rotary pneumatic control valves and 1 pneumatic control device for controlling intake and exhaust; the rotary pneumatic control valve comprises a pneumatic control valve body 1, wherein 2 cavities are arranged in the pneumatic control valve body, a public air passage 36 connected with the 2 cavities is arranged in the pneumatic control valve body, and a center shaft block 3 is communicated with the public air passage 36.
A push rod block 13 capable of reciprocating in the cavity is arranged in the cavity as shown in figures 2-3; the cavity comprises a front cavity 10, a sealing chamber 8 and a rear cavity 11 which are sequentially communicated, and an airtight channel 16 is communicated between the sealing chamber 8 and the rear cavity 11; the push rod block 13 passes through the airtight passage 16 and forms airtight fit with the airtight passage 16; one end of the push rod block 13 extends into the front chamber 10 and isolates the front chamber 10 from the sealing chamber 8, and the other end of the push rod block 13 extends into the rear chamber 11 and isolates the rear chamber 11 from the airtight channel 16; a central shaft block 3 which can rotate relative to the pneumatic control valve body is arranged in the pneumatic control valve body 1, and the central axis of the central shaft block 3 is parallel to the movement direction of the push rod block 13; an air flow channel 2 is arranged in the middle shaft block 3; a first air passage 4 is communicated between the air passage 2 and the sealing chamber 8; a second air passage 5 is communicated between the rear chamber 11 and the air passage channel 2; the rear chamber 11 is communicated with the outside air and is provided with a third air passage 6; the air control valve body 1 is also internally provided with an exhaust port 12 communicated to the outside, a fourth air passage 7 is communicated between the exhaust port 12 and the front cavity 10, and the direction of the fourth air passage 7 is consistent with the direction of the exhaust port 12.
The pneumatic control device as shown in fig. 7 to 11 includes a bracket 27; the bracket 27 is provided with a main air passage 28 and an exhaust passage 26; the main air passage 28 is provided with an air inlet 29 communicated with the rotary pneumatic valve; the bracket 27 is also provided with a first normally-closed valve 30, a second normally-closed valve 31 and a normally-open valve 32; one end of the normally open valve 32 is communicated with the main air passage 28, and the other end is communicated with the exhaust passage 26; one end of the first normally closed valve 30 is communicated with the main air passage 28, and the other end is communicated with the exhaust passage 26; one end of the second normally closed valve 31 communicates with the main gas passage 28 and the other end is provided with a gas transfer port 33 for the input gas.
The bracket 27 is also provided with a second sensing device 34 and a third sensing device 35; the second sensing device 34 is positioned at the communication position between the second normally closed valve 31 and the gas transmission port 33; the third sensing means 35 is located in communication between the air inlet 29 and the main air duct 28.
When the tire is inflated, firstly, the normally open valve 32 and the second normally closed valve 31 of the pneumatic control device are powered on, the normally open valve 32 is powered off, the second normally closed valve 31 is powered on, the first normally closed valve 30 is not started, and then the external air supply equipment supplies air to the pneumatic control device, namely, the air is input from the air conveying port 33; further, the gas flows through the second normally closed valve 31 and then to the main gas passage 28; finally, flows out from an air inlet 29 on the main air passage 28 and flows to the rotary pneumatic valve; further, the gas is input through the gas flow channel 2 in the middle shaft block 3, the gas enters the rear chamber 11 from the second gas channel 2, the pressure in the rear chamber 11 is continuously increased, and the push rod block 13 moves towards the front chamber 10 under the action of the gas pressure; i.e. the end of the pusher block 13 provided with the sealing chamber 8 and the front chamber 10 is moved towards the front chamber 10, the front chamber 10 and the sealing chamber 8 are then communicated, and the air flow in the first air passage 4 rapidly fills the front chamber 10, then the air flows to the fourth air passage 7 communicated between the air outlet 12 and the front chamber 10, and then the air is discharged from the air outlet 12 and conveyed into the tyre. The chamber 11 is then kept ventilated with the outside through the third air duct 6, avoiding trapping air and ensuring the movement of the pusher block 13.
Wherein, when the pusher block 13 moves toward the front chamber 10, the extension block 15 of the pusher block 13 is contacted with the sealant 19, thereby isolating the communication between the sealing chamber 8 and the rear chamber 11.
When the air charging is finished, the external air supply equipment stops supplying air, the normally open valve 32 and the second normally closed valve 31 of the air control device are powered off, the normally open valve 32 is powered off and the second normally closed valve 31 is powered off and closed, the first normally closed valve 30 is not started, namely the air control device rapidly exhausts air, then the air pressure of the first air passage 4 and the air pressure of the second air passage 5 are respectively zero, meanwhile, the air pressure in the rear chamber 11 is zero, and the residual air of the front chamber 10 moves the push rod block 13 towards the rear chamber 11 until the push rod block returns to the original position.
When the tire is deflated, firstly, the normally open valve 32 and the second normally closed valve 31 of the pneumatic control device are electrified in a pulse way, the normally open valve 32 is electrified and closed, the second normally closed valve 31 is electrified and opened in a pulse way, the first normally closed valve 30 is not started, and then, an external air supply device supplies air to the pneumatic control device, namely, the air is input from the air conveying port 33; further, the gas flows through the second normally closed valve 31 and then to the main gas passage 28; finally, flows out from an air inlet 29 on the main air passage 28 and flows to the rotary pneumatic valve; the air control device starts the air release process, pulse air is given, the air is input through the air flow channel 2 in the middle shaft block 3, then the air enters the sealing chamber 8 along the first air passage 4, then the air enters the rear chamber 11 along the second air passage 5, the pressure in the rear chamber 11 continuously increases, the push rod block 13 moves towards the front chamber 10 under the action of air pressure, at the moment, one end, provided with the isolation front chamber 10 and the sealing chamber 8, of the push rod block 13 moves towards the inside of the front chamber 10, and the front chamber 10 and the sealing chamber 8 are communicated.
At this time, the normally open valve 32 and the first normally closed valve 30 of the pneumatic control device are powered on, the normally open valve 32 is powered off, the first normally closed valve 30 is powered on, and the second normally closed valve 31 is not started; the first normally closed valve 30 communicates with the exhaust duct 26 and the gas then returns along the path of the inlet air, i.e. the gas in the tyre is fed in from the exhaust port 12 into the fourth air duct 7 and into the front chamber 10. Since at this point the rear chamber 11 is still under pressure, the front chamber 10 and the sealing chamber 8 are always in communication; thereupon, the gas flows from the front chamber 10 to the seal chamber 8, and the seal chamber 8 is rapidly filled with gas and is sent to the first gas passage 4 to be discharged to the gas flow passage 2 in the center block 3; simultaneously, the gas of the rear chamber 11 flows to the second air passage 5 and is conveyed to the air flow passage 2 of the middle shaft block 3, and finally, the gas is output from the air flow passage 2 of the middle shaft block 3 to the air inlet 29 of the air control device, flows to the main air passage 28, flows to the first normally closed valve 30 and is finally discharged out of the air control device; thereby realizing the deflation of the tire
When the deflation is finished, the normally open valve 32 and the first normally closed valve 30 of the pneumatic control device are powered off, the normally open valve 32 is powered off and opened, the first normally closed valve 30 is powered off and closed, the second normally closed valve 31 is not started, namely the pneumatic control device rapidly exhausts, then the air pressure of the first air passage 4 and the air pressure of the second air passage 5 are respectively zero, meanwhile, the air pressure in the rear chamber 11 is zero, and the residual air of the front chamber 10 moves the push rod block 13 towards the rear chamber 11 until the push rod block returns to the original position.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or application to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (9)
1. The rotary pneumatic control valve is characterized by comprising a pneumatic control valve body, wherein at least one cavity is formed in the pneumatic control valve body, and a push rod block capable of reciprocating in the cavity is arranged in the cavity; the cavity comprises a front cavity, a sealing chamber and a rear cavity which are sequentially communicated, and an airtight channel is communicated between the sealing chamber and the rear cavity; the push rod block passes through the airtight channel and forms airtight fit with the airtight channel; one end of the push rod block extends into the front cavity and isolates the front cavity from the sealing chamber, and the other end of the push rod block extends into the rear cavity and isolates the rear cavity from the airtight channel; a central shaft block which can rotate relative to the pneumatic control valve body is arranged in the pneumatic control valve body; the rotation axis of the middle shaft block is parallel to the moving direction of the push rod block; an air flow channel is arranged in the middle shaft block; a first air passage is communicated between the air flow passage and the sealing chamber; a second air passage is communicated between the rear cavity and the air flow passage; the rear cavity is communicated with the outside air and is provided with a third air passage; the pneumatic control valve body is internally provided with an exhaust port communicated to the outside, and a fourth air passage is communicated between the exhaust port and the front cavity.
2. The rotary pneumatic valve of claim 1, wherein an elastic assembly is further provided between the end of the pushrod block and the front chamber; one end of the elastic component is connected with the inner wall of the front cavity, and the other end of the elastic component is connected with the end part of the push rod block.
3. The rotary pneumatic valve of claim 1, wherein the pushrod block comprises a pushrod body, one end of the pushrod body extends along a central axis of the pushrod body to form a convex block, and the other end extends circumferentially to form an extension block; the convex block is connected with a sealing block, and the sealing block covers the opening of the sealing chamber facing the front chamber; the epitaxial block is connected with a sealing gasket for isolating the rear cavity from the airtight channel.
4. The rotary pneumatic control valve according to claim 1, wherein the pneumatic control valve body is provided with an induction air passage for communicating the front chamber with the outside; the opening of the induction air passage facing the outside is provided with a first induction device capable of inducing the air pressure of the front cavity; the first sensing device is positioned at the periphery of the pneumatic control valve body; the fourth air passage is oriented in accordance with the exhaust port.
5. The rotary pneumatic valve of claim 1, wherein the pneumatic valve body is of split design and the split direction of the pneumatic valve body is parallel to the direction of movement of the push rod block.
6. The rotary pneumatic valve of claim 4, wherein the pneumatic valve body comprises a first plate, a second plate, and a third plate stacked in sequence; the rear cavity is positioned in a space formed by overlapping the first plate and the second plate; the sealing chamber and the fourth air passage are positioned in the second plate; the exhaust port is positioned on the side surface of the second plate; the front cavity is positioned in a space formed by overlapping the second plate and the third plate; the first sensing device is positioned on the side face of the third plate.
7. The pneumatic control system is characterized by comprising a plurality of rotary pneumatic control valves and a pneumatic control device for controlling air inlet and air exhaust; the rotary pneumatic control valve comprises a pneumatic control valve body, wherein at least one cavity is formed in the pneumatic control valve body, and a push rod block capable of reciprocating in the cavity is arranged in the cavity; the cavity comprises a front cavity, a sealing chamber and a rear cavity which are sequentially communicated, and an airtight channel is communicated between the sealing chamber and the rear cavity; the push rod block passes through the airtight channel and forms airtight fit with the airtight channel; one end of the push rod block extends into the front cavity and isolates the front cavity from the sealing chamber, and the other end of the push rod block extends into the rear cavity and isolates the rear cavity from the airtight channel; a central shaft block which can rotate relative to the pneumatic control valve body is arranged in the pneumatic control valve body; the rotation axis of the middle shaft block is parallel to the moving direction of the push rod block; an air flow channel is arranged in the middle shaft block; a first air passage is communicated between the air flow passage and the sealing chamber; a second air passage is communicated between the rear cavity and the air passage; the rear cavity is communicated with the outside air and is provided with a third air passage; an exhaust port communicated with the outside is also arranged in the pneumatic control valve body, and a fourth air passage is communicated between the exhaust port and the front cavity; the pneumatic control device comprises a bracket; the support is provided with a main air passage and an exhaust passage; the main air passage is provided with an air inlet communicated with the rotary pneumatic control valve; the exhaust passage is communicated with the outside air; the bracket is also provided with a first normally-closed valve, a second normally-closed valve and a normally-open valve; one end of the normally open valve is communicated with the main air passage, and the other end of the normally open valve is communicated with the exhaust passage; one end of the first normally-closed valve is communicated with the main air passage, and the other end of the first normally-closed valve is communicated with the exhaust passage; one end of the second normally closed valve is communicated with the main air passage, and the other end of the second normally closed valve is provided with an air delivery port connected with the output end of external air supply equipment.
8. The pneumatic control system of claim 7, wherein the bracket is further provided with a second sensing device and a third sensing device; the second sensing device is positioned at the communication position between the second normally closed valve and the gas transmission port; the third sensing device is positioned at the communication position between the air inlet and the main air passage.
9. The pneumatic control system of claim 7, wherein an elastic assembly is further provided between the end of the pusher block and the front chamber; one end of the elastic component is connected with the inner wall of the front cavity, and the other end of the elastic component is connected with the end part of the push rod block; the push rod block comprises a push rod body, one end of the push rod body extends along the central axis of the push rod body to form a convex block, and the other end extends to the circumferential direction to form an extension block; the convex block is connected with a sealing block, and the sealing block covers the opening of the sealing chamber facing the front chamber; the epitaxial block is connected with a sealing gasket for isolating the rear cavity from the airtight channel.
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| CN201810096562.9A CN108131481B (en) | 2018-01-31 | 2018-01-31 | Rotary pneumatic control valve and pneumatic control system thereof |
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| CN201810096562.9A CN108131481B (en) | 2018-01-31 | 2018-01-31 | Rotary pneumatic control valve and pneumatic control system thereof |
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| CN101806369A (en) * | 2010-04-02 | 2010-08-18 | 武汉元丰汽车技术发展有限公司 | Inflation/deflation valve assembly for central tire inflation/deflation system of automobile |
| CN203703229U (en) * | 2014-01-23 | 2014-07-09 | 宜宾三江机械有限责任公司 | Combined wheel side valve |
| CN104482245A (en) * | 2014-12-09 | 2015-04-01 | 四川制动科技股份有限公司 | Quick-common conversion mechanism for railway braking valve |
| CN105042131A (en) * | 2015-06-30 | 2015-11-11 | 武汉友智服能源科技有限公司 | Novel wheel side valve with rotational structure and using method thereof |
| CN208687050U (en) * | 2018-01-31 | 2019-04-02 | 桂家旺 | A kind of rotary Pneumatic valve and its pneumatic control system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10502455B2 (en) * | 2010-01-14 | 2019-12-10 | Invensys Controls Australia Pty Ltd. | System and method to reduce standby energy loss in a gas burning appliance and components for use therewith |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101806369A (en) * | 2010-04-02 | 2010-08-18 | 武汉元丰汽车技术发展有限公司 | Inflation/deflation valve assembly for central tire inflation/deflation system of automobile |
| CN203703229U (en) * | 2014-01-23 | 2014-07-09 | 宜宾三江机械有限责任公司 | Combined wheel side valve |
| CN104482245A (en) * | 2014-12-09 | 2015-04-01 | 四川制动科技股份有限公司 | Quick-common conversion mechanism for railway braking valve |
| CN105042131A (en) * | 2015-06-30 | 2015-11-11 | 武汉友智服能源科技有限公司 | Novel wheel side valve with rotational structure and using method thereof |
| CN208687050U (en) * | 2018-01-31 | 2019-04-02 | 桂家旺 | A kind of rotary Pneumatic valve and its pneumatic control system |
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