Special built-in valve for worm type gas meter

Abstract

The invention discloses a special built-in valve for a worm type gas meter. The special built-in valve comprises a valve seat, a sealing frame, a sealing plug, a movement bracket, a micromotor, a rack valve rod, a worm and a gear set. The valve seat is divided into a valve chamber and a motor chamber by the movement bracket, and the micromotor is fixed to the movement bracket; the top and side of the valve chamber are provided with an air outlet and an air inlet respectively, and the sealing plug is sheathed on the sealing frame and located below the air outlet; the upper end of the rack valve rod is connected to the sealing frame, and the upper end of the rack valve rod penetrates through a locating round hole of the movement bracket; the rack part of the rack valve rod is engaged with the gear set in the motor chamber through threads, and the worm is fixed to an output shaft of the micromotor; and the gear set is rotatably connected to the rotary output end of the micromotor through the worm. According to the special built-in valve, an in-place sliding structure is adopted, and has a buffer effect on blockage instantaneous current; at the same time, the valve volume is reduced to adapt to smaller gas meters; and a pressure relief structure with a sealing effect on the motor chamber is formed through interference fit between an isolation pad and the valve rod.

Description

technical field [0001] The invention relates to a gas valve seat, in particular to a special built-in valve for a worm-type gas meter. Background technique [0002] In order to meet the needs of the market, many gas meter manufacturers need to use a gas meter to meet the working environment of customers with different flow rates. In this way, gas meters that are originally suitable for small flow rates are used in environments with large flow rates. The pressure loss of the motor valve requires higher adaptability; in addition, in order to reduce the cost of the gas meter, the gas meter factory continuously reduces its volume, which reduces the installation space of the built-in motor valve, and the volume of the built-in motor valve must be small to adapt; Moreover, fierce market competition requires a low-cost, high-reliability built-in motor valve. At this time, a built-in motor valve with small size, small pressure loss, low cost and high reliability is needed to meet t...

AI Technical Summary

Problems solved by technology

[0003] Although the traditional quick-closing valve with ratchet structure can meet the functional requirements, the cost of raw materials and production costs are high, and the movement occupies a large volume, which is difficult to meet the market demand for miniaturized gas meters, so its application range has certain limitations.

The traditional ratchet structure quick-closing valve adopts a spur gear set reduction mechanism. In order to obtain a larger reduction ratio, the number of gear sets is naturally large, so the transmission structure is more complicated, the movement volume cannot be reduced, and the manufacturing cost of parts and higher assembly costs

[0004] Another traditional low-cost spiral structure valve has high pressure loss, and the opening and closing of the valve are all in the form of motor blocking, which will generate high blocking current, which will have higher requirements on the control circuit, so Can not fully meet the needs of the market

The traditional spiral structure valve core will occupy the flow channel space of the gas, so the pressure loss is relatively large, and the way of opening and closing the valve in place is easy to cause the screw transmission structure to be stuck (that is, the valve cannot be operated again after the valve is opened and closed in place). close and open valve action)

[0005] The adaptability to various pressure environments is poor. The two valves experience high pressure or negative pressure environments during the base meter inspection and actual use, and the sealing sleeve (used to seal the motor room) is prone to bulging or shrinking, which affects the opening and closing performance of the valve.

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