Small electric valve for shock-absorbing protecting torsion force

Abstract

The invention relates to an electric valve with a shock absorption protection function and small torsion, which consists of two parts that are connected, namely, an actuating mechanism and a valve main body. A driving motor, a transmission nut, a transmission screw, a coupling and a valve shaft are in connection and transmission in sequence; the actuating mechanism is also internally provided with a position signal feedback device, an analog control device and an outage reduction device; the middle of a valve plate is provided with a pilot valve plate and a valve core spring, and the valve plate is provided with a sealing ring using polypropylene as base material; the two ends of the transmission nut are provided with a plane thrust ball bearing and a disc spring is arranged in the coupling. The valve has no leakage, can carry out automatic reduction in case of outage and reduce consumption, and is energy-saving, labor-saving and easy to open and close with advanced technology and excellent performance.

Description

Technical field: [0001] The invention relates to a valve in mechanical engineering, in particular to an electric valve with small shock-absorbing and protecting torque. Background technique: [0002] At present, valves at home and abroad, including the products of world-renowned valve manufacturers, have the following defects in the function of their regulating valves: leakage, some medium still passes through the valve after it is closed, and it is necessary to manually close the stop valve. And other equipment or systems with strict requirements will cause immeasurable losses. At the same time, most products do not have a power failure reset device. Only Siemens valves have a power failure reset device that compresses the oil pump return spring. The elastic force closes the valve, and the oil pump is easily damaged, which wastes energy. also. All kinds of valves generally have fatal structural defects: 1. The integral valve plate bears a large pressure. According to cal...

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Problems solved by technology

[0002] At present, valves at home and abroad, including the products of world-renowned valve manufacturers, have the following defects in the function of their regulating valves: leakage, some medium still passes through the valve after it is closed, and it is necessary to manually close the stop valve. and other equipment or systems with strict requirements cause immeasurable losses

All kinds of valves generally have fatal structural defects: 1. The integral valve plate bears a large pressure. According to calculations, after an electric two-way valve with a caliber of DN150 is closed under a pressure difference of 0.8MPa, the valve plate bears a pressure of 1413kg. In other words, closing a DN150 electric two-way valve requires an external force of at least 1413kg. Such a huge pressure often leads to damage to the actuator. Therefore, the production model of the valve can only be controlled below DN150, and the power required for larger models is doubled. Increase, such as a valve with a diameter of DN200 requires a closing force of 2512kg

2. A balance hole is opened on the valve plate to reduce the pressure difference, so that the force required to open the valve is reduced. For example, the Siemens valve adopts this method, but because the balance hole directly leads to the pipeline and the working system, and this system is relatively balanced The hole is often very large, which not only fails to achieve the effect of balancing the pressure on both sides of the valve plate, but also makes the leakage rate of the already leaking valve larger

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