SU1344241A3 - Device for preventing liquid reservoirs of railless vehicles from overfilling - Google Patents

Abstract

The invention relates to means for transporting liquids and can be used on vehicles tanks. The purpose of the invention is to increase the reliability of operation. When the tank 10 is filled with liquid, the float 7 rests on the stop 11, the shutter 12 closes the outlet 13 of the three-way valve 6 and by raising the element 14 opens the way to flow through the holes 15 and 16. When the liquid level reaches the float 7, the last float 7 rises, the shutter 12 returns the element 14 to its original position and thereby interrupts the flow of air from the pneumatic system 2 into the pneumatic cylinder 3. With a further rise of the liquid level, the shutter 12 opens the way between the openings 15 and 16, the air goes into the atmosphere, the spring 5 repents closure member 1 and the filling terminates samm container. 1 z.p, f-ly, 2 ill. and with 4 :: S 4 OJ

Description

The invention relates to means for transporting fluid and can be used on vehicles tanks.

The purpose of the invention is to increase the reliability of operation by ensuring the actuation of the locking element even in the event of a malfunction in the power supply, as well as the possibility of preventing the overflow of the two-part tanks.

Figure 1 shows the proposed device; 2 is the same for a two-part tank.

The device consists of a locking element 15 connected to the pneumatic system of the vehicle 2 by means of a pneumatic cylinder 3 with a piston 4 having a spring 5 for keeping it in the closed position, a three-way valve 6 with two positions, a sensing element which is a float 7 and filling pipeline 8 having a valve

The device works as follows.

In the event that the tank 10 is not completely filled, the float 7 rests on the stop 11, and the shutter 12 closes the outlet 13 of the three-way valve and, by raising the element 14, opens the flow between the holes 15 and 16.

In the quiescent state, the rotary valve 17 is closed so that from the pneumatic system 2 of the vehicle compressed air does not flow to the valve 6 and, consequently, into the pneumatic cylinder 3. Thus, the spring 5 keeps the locking element 1 in the energized state. In order to make it possible to fill the container 10, it is necessary by unlocking the rotary valve 17 to introduce air into the pneumatic cylinder 3, which, after overcoming the force of the spring 5, opens the locking element 1. After this, the pump 18 is started, ensuring the start of the filling process.

As soon as the fluid level reaches the float 7 and the float starts to rise, the shutter 12 provides for the return of the element 14 to its seat, causing the connection between the pneumatic system 2 and the pneumatic cylinder 3 to break. When the liquid level subsequently increases, the shutter 12 opens the way between the holes 15 and

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16, air escapes from the pivot cylinder 3 to the atmosphere, the spring 5 lowers the locking element 1 and the container 10 can no longer be filled.

Up to the moment when the pump 18 is turned off, the fluid circulates through the valve 19 to limit the pressure and the bypass line 20. After turning off the coca 18, the device should be disconnected from the pneumatic system 2 by means of the rotary valve 17.

When emptying the container 10, the float 7 due to the lowering of the level 5 of the liquid is lowered onto the support 11 and after switching the three-way valve 6, the device is again ready for the process required to fill the container with overfill protection. 0 Some tanks either provide for the presence of two independent containers, or the capacity is divided into two chambers.

The tank is divided into chambers 21 and 25 22, the filling of which is carried out through the filling line 23 with the help of the pump 24, and their emptying, on the contrary, with the help of the discharge valve 25.

In the filling line 23, an inlet element 1 is embedded, which, similarly to that described, is held by the force of the spring 5 in the closed position and opens pneumatically.

In the chambers 21 and 22, the gates 6 and 26, respectively, are installed, the openings of which 15 and 27 are connected to each other and to the pneumatic cylinder 3. The gates 6 and 26 through the openings 16 and 28 are connected via a three-way guide valve 29 through the rotary valve 17 to the pneumatic system 2. Direction when the valve 30 is in its middle position, the inlet valve 29 releases the flow through- (5 compressed air currents both in the direction of valve b and in the direction of valve 26.) If a pressure drop occurs on one side of the valve element 30, in this case paw element 30 in accordance with the positive feedback is moved in the direction of the space with the least pressure and obespeu

cheat on the side interrupting the passing air flow.

The filling of the container is carried out as follows.

Open the rotary valve. When this compressed air through the valve 29

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rushes from the pneumatic system 2 into valves 6 and 26. When the container is empty or not completely filled, the openings 15 and 27 of valves 6 and 26 are kept open by the floats 7 and 31, so that the pneumatic cylinder 3 unlocks the locking element 1. With Considering that in this state the same pressure acts on both sides of the valve element 30, the valve element 30 is in the middle position.

From the moment the pump 18 is turned on, the filling process begins. If in one of the chambers of the tank the liquid level approaches the permissible one, then in this case the valve corresponding to this chamber is switched by raising the float, as a result of which, in accordance with the principle already described, emptying the cylinder 3 is empty. Considering that To prevent overflow, the valve of the other chamber has not yet been able to switch; the slave cylinder 3 receives air from this chamber. To prevent this, a valve 29 is installed.

If, for example, valve 6 is already switched off and the pneumatic cylinder 3 is empty in accordance with this, and valve 26 is still in a non-switched state, then the following position occurs. The air flow in the direction of the orifice 16 is already blocked, that in this direction the air can no longer come from the pneumatic system 2. The valve 26 has not yet switched, so that the air flow passes through the opening 28. Accordingly, compressed air flows continuously through this valve.

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Since air does not flow to valve 6 from element 30 of valve 29, and to valve 26, the pressure on this side must be less. Shifting in this direction, the element 30 blocks the direction of air flow also in the direction of the valve 26. This ensures the final interruption of the air entering the pneumatic cylinder 3. The locking element 1 returns to the closed position under the action of a spring and the process of filling the tank is interrupted.

After the pump 18 is turned off and the rotary valve 17 is locked, the filling process is completed.

Claims (2)

Claim 1. Device for preventing overflow of liquid tanks of trackless vehicles, comprising a shut-off element connected to the pneumatic system of the vehicle, connected to the filling pipe of the liquid container, and a sensitive element for controlling the level of liquid in the container, characterized in that the purpose of improving the reliability of operation, the locking element is connected by means of a pneumatic cylinder to a piston having a spring for keeping it in the closed position, through a three-way valve apan from two positions with a sensing element, the cop to control the liquid level. 2. POP.1 device, characterized in that, in order to prevent overflow of two-part containers, it is equipped with an additional three-way valve with two positions, wherein the valves are interconnected and with the pneumatic system of the vehicle through a three-line directional valve. / 7 Editor A.Vorovich Compiled by E.Fishman Tehred I.Popovich Proofreader L.Pilipenko Order 4839/58 Circulation 374 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production floor igraphic enterprise, Uzhgorod, Projecto st., 4 Pa2.Z