Impact-resistant exhaust valve

Abstract

The invention discloses an impact-resistant exhaust valve. The impact-resistant exhaust valve comprises a valve body, wherein an exhaust port and a water inlet are formed in the valve body; a hollow floating body and a floating body guiding device are arranged in the valve body; a sealing valve plate is arranged in the valve body; a valve plate guiding base is arranged on the valve body; an exhausting guiding pipe is arranged on the sealing valve plate; an elastic floating resisting device is fixedly arranged on the lower part of the exhausting guide pipe; the lower end of the elastic floatingresisting device is lower than the lower end of the exhausting guide pipe; and the hollow floating body can lean against the lower port of a micro-exhaust channel after the elastic floating resistingdevice shrinks. When the sealing valve plate is in contact with the exhaust port, the elastic floating resisting device can buffer so as to reduce impact among parts; when a small amount of gas is gathered continuously in the valve body, the elastic floating resisting device can be jointly acted with the gravity of the hollow floating body, so that the micro-exhaust channel is opened as quick aspossible, the gas storage capacity is relatively small, and the re-ascending acceleration of the hollow floating body is not obvious. Meanwhile, in addition to the buffer action of the elastic floating resisting device, the impact is eliminated obviously after frequent micro-exhausting.

Description

technical field [0001] The invention relates to an exhaust valve, in particular to an anti-impact exhaust valve. Background technique [0002] The exhaust valve is an important device in the water pipeline system, and is usually installed at a high place in the water pipeline system or in a place where the air is closed. [0003] The function of the exhaust valve is: when a large amount of gas appears in the pipeline, the exhaust valve can discharge the air in the pipeline; Air resistance ensures stable water delivery and pipeline safety; when there is negative pressure in the pipeline, the exhaust valve can quickly inhale gas to prevent the pipeline from being sucked or the seal damaged. [0004] There are many structural forms of the existing exhaust valve, such as the invention patent with the application number "201610299783.7" and the name "an exhaust valve", and the application number "201620773702.8" and the name "a kind of inlet and outlet valve with a trace exhaust...

AI Technical Summary

Problems solved by technology

[0005] In actual use, the existing exhaust valve still has some problems according to the above-mentioned working principle. For the above-mentioned principles (2) and (3), the float will rise rapidly due to the water pressure in the pipeline. At this time, the buoyancy of the float F 浮 >Floating ball gravity G 球 + Gravity G of sealing valve plate 板 +Exhaust guide pipe gravity G 管 , the floating ball, the sealing valve plate and the exhaust guide pipe will move upwards with a certain acceleration trend, and the speed of the sealing valve plate will gradually increase accordingly. The formula Ft=mv, the sealing valve plate will be subjected to a very large reaction force at the exhaust port. This reaction force will not only generate a certain amount of noise, but also easily cause deformation of the sealing valve plate. At the same time, this reaction force will also be transmitted to the exhaust port. Guide pipe and float, because the float itself has a thin-walled structure and the cross-sectional area of ​​the exhaust guide pipe is small, so the reaction force transmitted will be locally applied to the surface of the float, causing the float to deform. In addition, according to the interaction of forces The sealing valve plate will also cause impact on the sealing ring at the exhaust port, which will cause the sealing ring to be easily damaged. Therefore, the existence of this impact force will have a greater impact on many parts of the exhaust valve, and it is especially easy to cause zero Component damage, causing the exhaust valve to fail

[0006] In addition, for the above principle (4), when a closed space is formed in the valve body, the gas in the closed space will be compressed by a certain volume due to the hydraulic pressure to form a high-pressure gas. At this time, the buoyancy of the float F 浮 + relative pressure of compressed gas F 气 = Floating ball gravity G 球 + Gravity G of sealing valve plate 板 +Exhaust guide pipe gravity G 管 + Exhaust support force f 排气口 , where the relative pressure of the compressed gas F 气 It is the pressure difference between the pressure of the compressed gas on the sealing valve plate and the pressure of the external atmosphere on the sealing valve plate. The floating ball, the sealing valve plate and the exhaust guide pipe remain stable under the balance of the above forces. According to F=PS, the sealing valve plate The larger the area, the greater the support force provided by the air pressure at this time. This is also the reason why the surface area of ​​the existing sealing valve plate is designed to be larger. The existing sealing valve plate is usually designed as a pot. The design of increasing the surface area also makes the sealing valve The strength of the plate itself is weak, and the impact force received when the sealing valve plate mentioned above is in sealing contact is easier to deform the sealing valve plate itself

After a small amount of gas enters the valve body, the water level drops slightly, and the buoyancy of the float F 浮 decrease, but because the pressure provided by the compressed gas is sufficient to support the sealing valve plate and the exhaust guide pipe and the buoyancy F of the float at this time 浮 >Floating ball gravity G 球 , the float did not break away from the exhaust guide pipe, and as more and more small amounts of gas entered the valve body, the water level gradually increased. When the buoyancy of the float F 浮 = Floating ball gravity G 球 At this time, the floating ball and the lower port of the exhaust guide pipe are still not easy to separate due to the internal and external pressure difference. 浮 Less than the float gravity G 球 And G 球 The function can overcome the pressure difference inside and outside the lower end of the exhaust guide pipe and the buoyancy of the float F 浮 The floating ball will break away from the exhaust guide pipe, and the trace exhaust channel will open; because the compressed gas pressure in the closed space of the valve body is obviously greater than the external atmospheric pressure, the gas will be discharged sharply, and because the trace exhaust channel is opened, the original airtight There is a large amount of gas stored in the space, and the valve body will be quickly filled with water, and the floating ball will accelerate to float up under the action of buoyancy, and finally impact on the lower port of the exhaust guide pipe. The impact between the lower ports of the exhaust guide pipe also becomes an important factor for the easy damage of the float

[0007] The main reasons for the above problems are: (1) There is a hard contact between the floating ball and the sealing valve plate, although some exhaust valves add rubber sleeves at the lower end of the exhaust guide pipe, which can be used as a buffer while improving the sealing effect , but the rubber sleeve is easily damaged when it is frequently impacted, and the problem has not been fundamentally solved; (2) The opening of the micro exhaust channel of the existing exhaust valve relies solely on the gravity of the float to overcome the buoyancy after the water level drops It is too easy to cause too much gas storage in the confined space, so that the impact of the floating ball on the exhaust guide pipe is greater after each trace of exhaust.

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