WO2008017259A1

WO2008017259A1 - A gas control valve

Info

Publication number: WO2008017259A1
Application number: PCT/CN2007/070310
Authority: WO
Inventors: Kehui Zhang
Original assignee: Kehui Zhang
Priority date: 2006-08-02
Filing date: 2007-07-18
Publication date: 2008-02-14
Also published as: CN100408903C; CN1888503A

Abstract

A gas control valve includes an inlet; a depressing tube communicating with the inlet wherein there is a valve port with a seal ring; a membrane valve body having a top half shell, a bottom half shell and a resilient membrane between the top half shell and the bottom half shell, the membrane defining a gas delivery chamber at the bottom half shell and a spring chamber with a pressing spring at the top half shell; an outlet communicating with the gas delivery chamber; a pin passing through the membrane and fixed thereon; a valve core having a valve head located ahead of the port and a valve rod extending through the port into the gas delivery chamber; a transmission device linking the pin with the valve rod for transforming up-down movement of the pin into axial movement of the valve rod; and a starting passage having an open-shut switch for communicating the inlet with the gas delivery chamber when starting the gas control valve. The gas control valve can prevent gas from leaking out without electromagnetic effect.

Description

Gas valve

(1) Technical field

The invention relates to a gas valve.

(2) Background technology

Due to the special nature of the use, the gas valve must have a high safety performance, and the gas valve should be automatically closed when there is an abnormal situation of gas leakage or excessive gas output.

At present, the automatic closing function of the gas valve when the gas leakage or outflow is abnormal is generally controlled by an electronic switch. Although the electronic switch is sensitive, on the one hand, it will inevitably generate certain electromagnetic induction during work, which will cause the gas to be ignited. On the other hand, the electronic switch is weak, and the internal electronic circuit is easy to age and not durable. Therefore, in terms of the existing gas valve, its safety needs to be further improved.

China Patent 93244657. 4 "Civil Pipe Gas Medium-Low Pressure Safety Valve" discloses a safety valve including a pneumatic control seat. The air pressure control seat includes an elastic seat, and the elastic seat can move up and down with the air pressure in the air outlet. The lever is driven to move the valve stem forward and backward in the air passage. When the air pressure in the air outlet chamber is too large, the piston on the valve stem abuts against the front valve port to block the air passage and play an insurance role. When a gas leakage accident occurs, overflow occurs in the air passage, and the air outlet speed is increased. The glass ball disposed under the air inlet floats due to the difference in airflow speed between the upper and lower sides, blocking the air inlet and providing an insurance function.

The disadvantages of this comparison document are as follows: 1. The glass ball needs a large air pressure difference when it floats. When the air inlet pressure is small, the difference between the upper and lower pressures of the glass ball caused by the air leakage phenomenon is not enough to make the glass ball move, so under the small intake pressure The contrast document can not play the role of air leakage protection; Second, it can not adapt to the change of the intake pressure, and the slightly overpressure elastic seat will act, closing the air passage, causing inconvenience. (3) Invention content

In order to solve the shortcomings of the existing gas valve under the small intake pressure and the inability to adapt to the change of the intake pressure, the present invention provides an adaptation to the change of the intake pressure, accurate response, and reliable supply under a small intake pressure. Pure mechanical gas valve for leak protection.

The technical solution to solve the technical problem of the present invention is:

A gas valve includes an intake pipe, a pressure reducing valve pipe and an air pressure control seat, wherein the intake pipe is provided with a coupling nut for connecting a gas cylinder, and the outlet air pressure control seat comprises an upper cover and a base. There is a resilient seat between the upper cover and the base, an air outlet chamber is below the elastic seat, a spring chamber is above the elastic seat, and a gas seal is sealed between the air outlet chamber and the spring chamber, and the pressure reducing valve a front end of the tube is in communication with the intake pipe, and a rear end of the pressure reducing valve tube is in communication with the outlet chamber;

The air outlet chamber is provided with an air outlet tube, and the spring chamber has a compression spring. One end of the compression spring is placed on the elastic seat, and the other end of the compression spring is placed on the upper cover. The pressure reducing valve tube is internally provided with an air inlet nozzle,

The utility model further includes a temporary air pipe for connecting the air inlet pipe and the air outlet cavity, wherein the temporary air pipe is provided with a through-close switch; the pressure reducing valve pipe is provided with a valve port and a valve core, and the valve port is provided with a sealing ring, the valve core includes a head and a valve stem along an axial direction of the pressure reducing valve tube, and a head of the valve core is disposed in front of the valve port and cooperates with a sealing ring of the valve port a tail portion of the valve stem passes through the valve port and protrudes into the air outlet chamber; the elastic seat is provided with a connecting rod, and the connecting rod and the valve stem pass through the connecting rod The up and down motion is converted into a linkage of the front and rear movement of the valve stem.

Further, the linkage is a lever hinged in the air outlet chamber, the head of the lever is bent, the head of the lever is connected to the tail of the valve stem, and the tail of the lever is connected to the connecting rod. Or: the tail of the valve stem and the connecting rod are provided with a tooth pattern, The linkage is a gear device, the gear device is located behind the connecting rod, and the gear meshes with a tail portion of the valve stem and a connecting rod.

Further, a valve for partitioning the temporary tracheal lumen is slidably inserted into the tube wall of the temporary air tube, and the valve is hermetically sealed with the tube wall of the temporary air tube, and the valve is a temporary air tube The switch is closed. Or: the inner wall of the temporary air tube is provided with a second valve port, the second valve body is slidably disposed in the lumen of the temporary air tube, the head of the second valve core and the second valve a mouth sealing fit, and a return spring is disposed between the head of the second valve core and the inner wall of the temporary air pipe, the tail of the second valve core extends out of the temporary air pipe, and the second valve port cooperates with the valve core An on/off switch that constitutes a temporary air pipe.

Further, the temporary air pipe and the pressure reducing valve tube share a pipe wall, and the through-close switch divides the cavity of the temporary air pipe into a front cavity and a rear cavity, and the valve port reduces the The lumen of the pressure valve tube is divided into a front inlet chamber and a rear outlet chamber, the front chamber is in communication with the front intake chamber, and the rear chamber is in communication with the rear outlet chamber.

When the gas has not been passed, the connecting rod is pressed down by the compression spring, and the connecting rod drives the valve stem to move backward, and the head of the valve core is sealed at the valve port. At the beginning of the gas connection, the valve port in the pressure reducing valve tube is still sealed. At this time, it is first necessary to open the through-close switch of the temporary air pipe so that the gas can enter the air outlet through the temporary air pipe. When the gas entering the air outlet reaches a certain amount and generates a sufficient pressure to withstand the pressure of the compression spring, the air pressure pushes up the elastic seat, and the connecting rod also rises along with the elastic seat. Since the connecting rod and the valve stem are connected by a linkage device that converts the up and down motion of the connecting rod into the forward and backward movement of the valve stem, the rise of the connecting rod drives the valve stem to move forward, and the valve port is no longer closed, and the gas can be The pressure reducing valve tube enters the air outlet chamber. At this time, the through-close switch of the temporary air tube is closed, and the gas is directly introduced into the air outlet chamber by the pressure reducing valve tube, so that the air pressure in the air outlet chamber and the pressure of the pressure spring are maintained in an equilibrium state. Once an air leak occurs or an abnormal situation occurs in which the amount of gas is too large, at this time, since the gas output is larger than normal, the gas is discharged. The air pressure in the cavity becomes small and cannot be balanced with the pressure of the compression spring. The compression spring presses down the elastic seat again, the connecting rod is pressed down with the elastic seat, and the lower pressing link drives the valve stem to move backward to seal the pressure reducing valve tube. The valve port, which prevents the continued circulation of gas, can effectively prevent leakage and interrupt abnormal ventilation. It has been found that the gas leakage protection of the present invention has nothing to do with the magnitude of the intake pressure, and the air passage can be effectively closed even at a small intake pressure.

The invention is provided with an air inlet nozzle in the pressure reducing valve tube to form a pressure reducing valve. Therefore, the air flow has been adjusted to a set value before entering the elastic seat, and the air pressure in the air outlet chamber under the elastic seat is stable and is not affected. The influence of changes in gas pressure does not cause misjudgment due to changes in intake pressure, and is accurate and reliable for reaction and easy to use.

The invention has the advantages that: it can adapt to the change of the intake pressure, is accurate and reliable for the reaction, and is convenient to use; can provide reliable leakage protection under a small intake pressure; the whole gas valve adopts a pure mechanical structure, and the operation is long-lasting and reliable, and whether Whether the valve is opened or closed will not produce any electromagnetic effect and will not cause the danger of igniting the gas. This valve complies with the national gas pressure regulator standard. Although many functions are added inside the valve, it does not affect the standard and function. It has a long service life, good stability and long-lasting safety.

(4) Description of the drawings

1 is a schematic structural view of a gas valve according to Embodiment 1.

Figure 2 is a longitudinal cross-sectional view of the pressure reducing valve tube of the first embodiment.

(5) Specific implementation methods

The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

Embodiment 1

Referring to Figure 1, a gas valve includes an intake pipe 1, a pressure reducing valve tube 2, and an air pressure control seat. The intake pipe 1 is sleeved with a coupling nut 3 for connecting the gas cylinder, and the pressure reducing valve tube 2 is internally provided with an inlet nozzle 4. The air pressure control seat comprises an upper cover 5 and a base 6, the upper cover 5 and the base 6 There is a resilient seat composed of an upper steel sheet 7 and a lower sealing rubber sheet 8, a connecting rod 9 passing through the steel sheet 7 and the sealing rubber sheet 8, the connecting rod 9 having a threaded end, The head of the rod cooperates with a nut 10 to join the steel sheet 7 and the rubber sealing sheet 8. The sealing rubber sheet 8 is sandwiched between the upper cover 5 and the base 6 of the air pressure control seat.

Below the sealing rubber sheet 8, an air outlet chamber 11 is provided, and an air outlet tube 12 is provided in the air outlet chamber 11. Above the sealing rubber sheet 8 is a spring chamber 13 having a compression spring 14 therein, one end of the compression spring 14 is placed on the elastic seat, and the other end of the compression spring 14 is placed on the upper cover. . The sealing rubber sheet 8 is hermetically sealed between the outlet chamber 11 and the spring chamber 13. The front end of the pressure reducing valve tube 2 communicates with the intake pipe 1, and the rear end of the pressure reducing valve tube 2 communicates with the air outlet chamber 11.

The valve port 15 and the valve core 17 formed by the convex ring in the pressure reducing valve tube 2 are provided with a sealing ring 16 on the valve port 15. The spool 17 includes a head portion 18 and a valve stem 19 axially along the pressure reducing valve tube. The head 18 of the spool greets the direction of the gas and cooperates with the seal 16 of the valve port. The tail of the valve stem 19 extends into the outlet chamber 11. The valve port divides the lumen of the pressure reducing valve tube 2 into a front intake chamber 20 and a rear outlet chamber 21

A temporary air pipe 22 is connected between the intake pipe 1 and the outlet chamber 11 of the air pressure control seat to connect the two. The temporary air pipe 22 shares a pipe wall with the pressure reducing valve pipe 2. The inner wall of the temporary air tube 22 is provided with a convex shoulder to form a second valve port 29. The second valve core 23 is slidably disposed in the lumen of the temporary air tube 22, the head of the second valve core 23 is sealingly engaged with the second valve port 29, and the head of the second valve core 23 and the inner wall of the temporary air tube 23 A return spring 24 is disposed between the tail portions of the second valve body 23 and extending outside the temporary air tube 22. The second valve port 29 divides the lumen of the temporary air tube 22 into a front chamber 25 and a rear chamber 26, and the front chamber 25 communicates with the front air inlet chamber 20 of the pressure reducing valve tube through a flow hole, the rear chamber 26 and the pressure reducing valve tube The rear air outlet chamber 21 communicates through the flow holes.

The valve stem 19 and the connecting rod 9 are connected by a lever 27 hinged in the air outlet chamber 11. The head of the lever 27 is bent, and the tail of the valve stem 19 is provided with a through hole 28, a bar The head of the rod is inserted into the through hole 28 at the tail of the valve stem; the connecting rod 9 is also provided with a through hole, and the tail of the lever 27 is inserted into the through hole of the connecting rod 27. The function of the lever 27 is to convert the up and down motion of the link into the forward and backward movement of the valve stem.

When the gas is not yet passed, the connecting rod 9 is pressed down by the compression spring 14, and the connecting rod 9 drives the valve stem 19 to move backward, at which time the head of the valve core seals the valve port 15. At the beginning of the gas switching, the valve port 15 in the pressure reducing valve tube 2 is still sealed. At this time, it is first necessary to push the second spool 23 in the temporary air pipe and open the second port 29 so that the gas can enter the outlet chamber 11 through the temporary air pipe 22. When the gas entering the outlet chamber 11 reaches a certain amount, generating a sufficiently large pressure to withstand the pressure of the compression spring 14, the air pressure pushes up the elastic seat, and the connecting rod 9 also rises along with the elastic seat. Since the connecting rod 9 and the valve stem 19 are connected by a lever 27 that converts the up and down movement of the connecting rod 9 into the forward and backward movement of the valve stem 19, the rise of the connecting rod 9 causes the valve stem 19 to move forward, and at this time, the valve port 15 is no longer closed, and gas can enter the outlet chamber 11 through the pressure reducing valve tube 2. At this time, the on-off switch of the temporary air pipe 22 is closed, and the gas is directly introduced into the air outlet chamber 11 from the pressure reducing valve tube 2, so that the air pressure in the air outlet chamber 11 and the pressure of the compression spring 14 are maintained in an equilibrium state (required at the time of production of the valve) Calculate and adjust the spring constant of the compression spring to achieve the balance between the compression spring and the air pressure at the specified air pressure). In the event of an air leak or an abnormal situation in which the amount of outgas is excessively large, at this time, since the amount of outgas is larger than normal, the air pressure in the air outlet chamber 11 becomes small to be in balance with the pressure of the compression spring 14, and the compression spring 14 is pressed again. The elastic seat, the connecting rod 9 is pressed down with the elastic seat, and the lower pressing link 9 drives the valve stem 19 to move back to seal the valve port 15 of the pressure reducing valve tube, preventing the gas from continuing to flow, thereby effectively preventing leakage and interruption. Abnormal ventilation.

Of course, the valve port of the pressure reducing valve tube is not only a form of a convex ring, but also a groove. The first valve port of the temporary air pipe is not only a form of a shoulder, but also a groove. A valve for partitioning the temporary tracheal lumen is slidably inserted into the wall of the temporary trachea, and the valve is hermetically sealed with the wall of the temporary trachea. The rest of the structure and embodiment are the same as in the first embodiment.

The difference between this embodiment and the first embodiment is that the on-off switch of the temporary air pipe is different. In the first embodiment, the valve core is used, which is in the form of a valve in this embodiment.

Embodiment 3

The tail of the valve stem and the connecting rod are provided with a tooth pattern, and the valve stem and the connecting rod are connected by a gear, the gear is located at the rear of the connecting rod, and the gear meshes with the connecting rod and the tooth strip of the tail of the valve stem. The rest of the structure and embodiment are the same as in the second embodiment.

The difference between this embodiment and the second embodiment is that the structure of the linkage for converting the up and down motion of the connecting rod into the front and rear movement of the valve stem is different, and the second embodiment is in the form of a lever, which is a gear in this embodiment. form.

Embodiment 4

The tail of the valve stem and the connecting rod are provided with a tooth pattern, and the valve stem and the connecting rod are connected by a gear, the gear is located at the rear of the connecting rod, and the gear meshes with the connecting rod and the tooth strip of the tail of the valve stem. The rest of the structure and embodiment are the same as in the first embodiment.

The difference between this embodiment and the first embodiment is that the structure of the linkage for converting the up and down motion of the connecting rod into the front and rear movement of the valve stem is different. In the second embodiment, the lever is in the form of a gear. form.

Embodiment 5

The temporary air pipe is independent of the pressure reducing valve tube, one end of the temporary air pipe is in communication with the air inlet pipe, and the other end is in communication with the air outlet chamber. The rest of the structure and implementation are the same as in the first embodiment.

Embodiment 6 The temporary air pipe is independent of the pressure reducing valve tube, one end of the temporary air pipe is in communication with the air inlet pipe, and the other end is in communication with the air outlet cavity. The rest of the structure and embodiment are the same as in the second embodiment.

Example 7

The temporary air pipe is independent of the pressure reducing valve tube, one end of the temporary air pipe is in communication with the air inlet pipe, and the other end is in communication with the air outlet chamber. The rest of the structure and embodiment are the same as in the third embodiment.

Example eight

The temporary air pipe is independent of the pressure reducing valve tube, one end of the temporary air pipe is in communication with the air inlet pipe, and the other end is in communication with the air outlet chamber. The rest of the structure and embodiment are the same as in the fourth embodiment.

Claims

Claim

A gas valve comprising an intake pipe, a pressure reducing valve pipe and an air pressure control seat, wherein the intake pipe is provided with a coupling nut for connecting a gas cylinder, and the air pressure control seat comprises an upper cover and a base, a resilient seat between the upper cover and the base, an air outlet cavity under the elastic seat, a spring cavity above the elastic seat, and a gas seal between the air outlet cavity and the spring cavity, a front end of the pressure reducing valve tube is in communication with the intake pipe, and a rear end of the pressure reducing valve tube is in communication with the air outlet chamber;

The air outlet chamber is provided with an air outlet tube, and the spring chamber has a compression spring. One end of the compression spring is placed on the elastic seat, and the other end of the compression spring is placed on the upper cover. ; is characterized by:

The pressure reducing valve tube is internally provided with an air inlet nozzle;

The utility model further includes a temporary air pipe for connecting the air inlet pipe and the air outlet cavity, wherein the temporary air pipe is provided with a through-close switch;

The pressure reducing valve tube is provided with a valve port and a valve core, the valve port is provided with a sealing ring, and the valve core comprises a head and a valve stem along the axial direction of the pressure reducing valve tube, and the valve core a head is disposed in front of the valve port and cooperates with a sealing ring of the valve port, and a tail portion of the valve rod passes through the valve port and extends into the air outlet chamber;

The elastic seat is provided with a connecting rod, and the connecting rod and the valve stem are connected by a linkage device that converts the up and down movement of the connecting rod into the forward and backward movement of the valve rod.

2. The gas valve according to claim 1, wherein: the linkage is a lever hinged in the outlet chamber, the head of the lever is bent, and the head of the lever is coupled to the tail of the valve stem The tail of the lever is coupled to the connecting rod.

The gas valve according to claim 1, wherein: the tail portion of the valve stem and the connecting rod are provided with a tooth pattern, the linkage device is a gear device, and the gear device is located at the Behind the connecting rod, the gear device meshes with the tail of the valve stem and the connecting rod.

The gas valve according to any one of claims 1 to 3, wherein: the valve wall of the temporary air pipe is slidably inserted with a valve for blocking the temporary airway lumen, the valve and the valve The airtightness between the walls of the temporary trachea is described.

The gas valve according to any one of claims 1 to 3, wherein: the inner wall of the temporary air pipe is provided with a second valve port, and the second valve is slidably disposed in the lumen of the temporary air pipe a core, a head of the second valve core is sealingly engaged with the second valve port, and a return spring is disposed between a head of the second valve core and an inner wall of the temporary air pipe, and the second valve core is The tail extends out of the temporary trachea.

The gas valve according to any one of claims 1 to 3, wherein: the temporary air pipe and the pressure reducing valve tube share a pipe wall, and the through-close switch turns the temporary air pipe The lumen is divided into a front chamber and a rear chamber, and the valve port divides the lumen of the pressure reducing valve tube into a front inlet chamber and a rear outlet chamber, and the front chamber communicates with the front inlet chamber. The rear chamber is in communication with the rear venting chamber.

The gas valve according to claim 4, wherein: the temporary air pipe and the pressure reducing valve tube share a pipe wall, and the through-close switch divides the cavity of the temporary air pipe into a front a valve port dividing the lumen of the pressure reducing valve tube into a front intake chamber and a rear outlet chamber, wherein the front chamber communicates with the front intake chamber, the rear chamber It is in communication with the rear air outlet chamber.

The gas valve according to claim 5, wherein: the temporary air pipe and the pressure reducing valve tube share a pipe wall, and the through-close switch divides the cavity of the temporary air pipe into a front a valve port dividing the lumen of the pressure reducing valve tube into a front intake chamber and a rear outlet chamber, wherein the front chamber communicates with the front intake chamber, the rear chamber It is in communication with the rear air outlet chamber.

The gas valve according to claim 1, wherein: the elastic seat is composed of an upper steel sheet and a lower sealing rubber sheet, and the sealing rubber sheet is clamped on the air pressure control seat. Between the cover and the base.

The gas valve according to claim 9, wherein: said connecting rod head is provided with a thread, and a head of said connecting rod is engaged with a nut.