1. background: the existing pneumatic water spraying device for freight cars, such as China patent document ZL96233645.9, discloses a pneumatic water spraying device for freight cars, which consists of a pressure reducing valve, a cooling water pipe, a nozzle, a four-way valve and a three-way valve. The pressure reducing valve is installed at the output end of the gas storage tank, and the cooling water tank is fixed at any idle position under the carriage. The depressurized gas is input into the cooling water tank, so that the water therein is pressurized and sent out.
Now each control valve of the four-way valve is connected with the three-way valve, which directly sends the cooling water to the automobile water tank, and the front and rear brake drums and tires are sprayed to cool down, thus prolonging the service life of all the heating parts of the truck, especially the brake drums and tires. The advantages of the above structure are that the trace gas is used to brake the high-pressure gas to act on water to generate water pressure, and the water storage tank is not limited by the water storage capacity and the height of the installation position, and the water flow rate is the same from beginning to end.
So as to reduce the temperature of each heating part more effectively, prolong the service life of the automobile, better ensure the braking effect and driving safety of the freight car, and have convenient use and beautiful appearance.
2. Disadvantages are:
(1) When the water storage tank is in use, dregs will appear, which will easily block the nozzle and hinder the water from flowing out;
(2) The driver didn't know how much water was in the water storage tank during spraying, so he didn't know when the water was used up and didn't add water in time, which led to the brake drum not cooling in time and affected the braking safety;
(3) When the water is used up, if the driver does not turn off the shower switch in time, what is more serious is that the high-pressure gas of the automobile air storage tank will flow out to the nozzle along the water outlet head, shower switch and water pipe of the water storage tank, which cannot guarantee the safe gas use of the automobile itself, thus greatly affecting the safety system of the automobile.
The utility model aims to provide a pneumatic water shower for freight cars. The utility model solves the problems in the prior art that the nozzle is easy to block, the driver can't know the water level of the water storage tank and the air pressure of the vehicle cylinder can't be controlled.