a pressure control valve

Abstract

The invention relates to a tire pressure control valve, which aims to eliminate the interference of high-pressure gas, solve the problem of unsteady state of the valve core, and provide a practically applicable technical scheme of the pressure control valve. The technical solution of the present invention is: a pressure control valve, the valve core is provided with a radial through hole, the valve cavity is composed of an inner cavity and an outer cavity with overlapping axes and opposite openings, the valve cavity at the front opening is connected to the intake pipe, and the valve core is inserted into the In the cavity of the rear opening, the side wall of the inner cavity is provided with a through hole corresponding to the through hole of the spool, and is closely matched with the spool movable; the cavity of the rear opening is provided with a ball, a spring and bolts to form a pressure regulating device. The valve core is provided with two concave limit structures. When the ball is in the first limit structure, the valve core is in the closed position. When the tire pressure is lower than the lower limit, the valve core breaks through the limit. , the resistance of the ball to the spool disappears suddenly, and the spool quickly moves back to the open position, and the ball enters the second limit structure. When the tire pressure is higher than the upper limit, the spool breaks through the limit and quickly moves forward Close valve position.

Description

technical field [0001] The invention relates to the field of pump valves, in particular to a tire pressure control valve for automatic tire inflation. Background technique [0002] The pressure control valve is the key control element of the tire automatic air supply system. In January 2008, a "tire pressure automatic control device" disclosed in the Chinese Patent Publication No. CN101108576A provided a technical solution for high and low pressure double valves. The solution has the following technical problems: 1) Exhaust and stop inflation occur at the same time, that is, "when the temperature of the tire 1 rises and the pressure inside the tire exceeds the design value, the piston 16 in the low-pressure valve is pushed toward the direction of the spring 17, and the exhaust is opened. Hole 19", "When the pressure of the tire 1 reaches the design value, the air will push the piston 16 in the low-pressure valve to the direction of the spring 17 through the piston air guide ...

AI Technical Summary

Problems solved by technology

[0002] The pressure control valve is the key control element of the tire automatic air supply system. In January 2008, a "tire pressure automatic control device" disclosed in the Chinese Patent Publication No. CN101108576A provided a technical solution for high and low pressure double valves. The solution has the following technical problems: 1) Exhaust and stop inflation occur at the same time, that is, "when the temperature of the tire 1 rises and the pressure inside the tire exceeds the design value, the piston 16 in the low-pressure valve is pushed toward the direction of the spring 17, and the exhaust is opened. Hole 19", "When the pressure of the tire 1 reaches the design value, the air will push the piston 16 in the low-pressure valve to the direction of the spring 17 through the piston air guide hole 22, and move and close the air inlet 18". The air will open the exhaust hole to exhaust, so that the tire pressure will drop. When the exhaust stops or even stops completely, it will start to replenish the air. In this way, not only the high-pressure gas in the high-pressure air bag will be consumed quickly, but also the gas in the tire Then it will run out quickly

2) Since the piston 16 can be pushed to the position of closing the air intake hole 18 by the gas that enters the top of the valve body 24 through the piston air guide hole 22 after the tire pressure reaches the design value, then when the air intake hole 18 is opened, it enters the valve body 24 The high-pressure gas can more easily enter the top of the valve body 24 through the piston air guide hole 22, and push the piston 16 to the position of closing the air inlet hole 18. It can be seen that the position of the piston 16 is determined by the gas pressure in the spring and the valve body 24, and It is not determined by the spring and tire pressure. Therefore, it is actually impossible to automatically close the valve and stop inflation when the tire pressure is greater than the set value.

In July 2019, the Chinese Patent Publication No. CN110056680A disclosed the technical solution of "a two-way air valve and a wheel using the two-way air valve". Although the prior art has been improved, the following technical problems still exist: 1) The scheme "when the air pressure in the tire is too high, ..., the gas in the tire is discharged to the atmosphere, ...; when the air pressure is too low, the air supply channel is opened to supply air," under the existing technical conditions, during the day Especially in summer, when driving for a long distance, the high temperature generated by the engine, brake disc, and brake caliper will be transmitted to the gas in the tire through the wheel hub and rim, resulting in excessive tire pressure. If the exhaust pressure is reduced at this time, then when you stop driving for a period of time , when the tire temperature drops, the tire pressure will be too low, and it must be inflated. In this way, the car must be inflated every day, and the high-pressure air chamber needs to be refilled every few days. The monthly drop will be 0.01~0.03bar, and the gas will be replenished once a few months at most. With this automatic gas replenishment technology, the high-pressure gas chamber will be replenished once in less than 10 days; 2) The valve body assembly described in the plan There is a valve cavity, and the valve cavity includes a first matching section for cooperating with the first valve core and a second cooperating section for cooperating with the second spool, and the first cooperating section and the second cooperating section are provided elastic member mounting cavity,” combined with its attached Figure 4 , it can be known that the first spool 34 is directly pushed inward by the high-pressure gas entering the high-pressure inlet passage 331, therefore, the positions of the first spool 34 and the second spool 37 are not simply determined by "The air pressure in the tire" is determined by the air pressure of the high-pressure air chamber, that is, when the air pressure in the high-pressure air chamber is relatively high, even if the air pressure in the tire is sufficient, the air will be replenished, and even if it is too high, it will not be exhausted. Air, unable to achieve the function of "guaranteeing stable tire pressure"

At the same time, the second valve core 37 is pushed back, which cannot reflect the current tire pressure's demand for air supplementation.

From the above analysis, it can be seen that: 1) The existing technology uses the control strategy of exhaust and decompression, and the gain outweighs the gain

2) The pressure control valve technology that uses tire pressure to control air supplement cannot be realized in the existing technology

3) The axial force of high-pressure gas on the valve core or piston cannot be ruled out

4) The spool works in a critical oscillation state and cannot be changed

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