RU421U1 - Pneumo-hydraulic cooling system - Google Patents

Abstract

A cooling system for pneumohydraulic mechanisms, comprising a heat exchanger, coolant supply and exhaust lines, an additional cooling unit, characterized in that the used compressed air of the pneumohydraulic mechanisms is used as a refrigerant.

Description

 MECHANISMS

JJ.

llOJe f w otnoyoyoya to mapovnoyrovniyu and can (Y1t. it is used in cooling systems of pneumohydraulic mechanisms.

A known hydromechanical transmission cooling system comprising a torque converter sequentially upstream and downstream, a pump and a pump, which form a circular circuit connected to the main hydraulic system, a hydraulic motor installed in the circulation circuit behind the pump, and a fan driven by a hydraulic motor. This principle of cooling a hydraulic fluid by air flow is not acceptable for large hydraulic systems, due to its inefficiency and inefficiency. A.S. I07I843, Ml I6H 41/30, BI Sh, 1984.

Closest to the proposed system is typed in

as a prototype, a hydraulic fluid cooling system using cold industrial water, manufactured by CE-KA, mounted on the pneumatic-hydraulic mechanisms of the molding lines of KamAZ foundries, containing a pump 2 for successively turning downstream of the pump 2 to transfer hydraulic fluid through hydraulic pipe 3 to a heat exchanger I with constantly circulating cold technical water supplied to the cooling system from a single water supply system, tank 4 with a fluid (Fig. I). The system has the following disadvantages:

- high capital costs associated with the consumption of significant amounts of water (. 100 l / min per day, round-the-clock, without L1-OUT) for cooling the hydraulic fluid of the pneumatic and hydraulic mechanisms;

- poor heat dissipation due to the deposition of scale and sludge in the cooling system due to their high content in industrial water supplied for cooling;

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The claimed technical solution is aimed at solving the following tasks:

-decrease the material costs associated with the consumption of significant amounts of water for cooling the hydraulic fluid of the pneumatic-hydraulic mechanisms;

-improve the heat dissipation in the cooling system.

As a result, the reliability and efficiency of the system increases. The specified result is achieved by the fact that in the known cooling system of pneumatic and hydraulic mechanisms containing a heat exchanger, the supply and exhaust lines of chl8dsh: enta, the used compressed air of the same mechanisms is used as a refrigerant, and when the temperature in the hydraulic system rises close to a predetermined critical value, it comes into operation additional cooling unit. Comparative analysis with the prototype allows us to conclude that the claimed cooling system for pneumatic and hydraulic mechanisms is different in that the used compressed air of the same mechanisms is used as a refrigerant, and when the temperature rises in the hydraulic system, an additional cooling unit comes into operation close to the critical temperature.

The use of the same mechanisms as the used compressed air refrigerant will reduce material costs associated with the consumption of significant amounts of water for cooling the hydraulic fluid of the pneumatic-hydraulic mechanisms, as well as eliminate the ingress of water into the hydraulic fluid, which makes the hydraulic fluid unusable, which generally increases the system's economy .

Use of compressed air as a refrigerant eliminates

clogging of the cooling system with scale and sludge, which improves the removal of heat of hydraulic fluid and increases the reliability of the system.

Entering into operation when the temperature in the hydraulic system is close to the specified critical additional cooling unit eliminates overheating of the hydraulic fluid, increases the reliability of the system.

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/ v Ofwbm / Chevmo-hydraulic mechanisms The cooling system of pneumatic-hydraulic mechanisms contains a normally open valve I and a normally closed valve 2, connected by their outputs to the pneumatic-cylinder 3 and controlled by the air valve ЗПЛ5) of pressure 4 through control line 5, pressure line 6, through which compressed air is supplied from the station, a discharge line 7 for exhausting the cooled air from the pneumatic system and connected to the inlet of the heat exchanger, an additional cooling unit, consisting of a control valve 9, norms flax closed valve 10 and the control line II.

The cooling system of pneumatic-hydraulic mechanisms works as follows. Compressed air is supplied through the pressure line 6 through a normally open valve I to the piston cavity of the pneumatic cylinder 3. At the moment of air supply from the valve to the cylinder, cooling of compressed air occurs due to its expansion. From the rod cavity of the cylinder 3 through a normally closed valve 2, the drain line 7, the exhaust air enters the heat exchanger II. At the moment of air leaving valve 2, air also cools sharply due to its expansion. Normally open valve I and normally closed valve 2 are controlled by control valve 4 through control line 5. An electrical signal is supplied to control valve 4, after which it switches through the line control 5 switches valves 2 and I, opening valve 2 for supplying compressed air from the pressure line 6 to the cylinder rod cavity, after which the normally open valve I closes the pressure line 6 and opens the compressed air outlet a piston chamber of the cylinder 3 in the drain line 7, from which it enters the heat exchanger.

When the temperature in the hydraulic system is close to the critical value, an additional cooling unit comes into operation, containing a control valve 8, a control line 10 and a normally closed valve 9. At the same time, an electrical signal is supplied to valve 8, the valve opens, air from the pressure line 6 gives an air signal on the control line 10 to a normally closed power valve 9, which in turn connects the pressure line 6 to the drain line 7. The operation of the additional cooling unit is impulsive, turning on and off after a certain time, due to which effective cooling of compressed air is achieved, which, when entering the heat exchanger, intensively cools the hydraulic fluid. The additional cooling unit operates until the temperature of the fluid is in. system does not reach working. The inventive cooling system was tested at a foundry of KamA.3 JSC for 3 months. As a result of the tests, the system has shown its reliability and efficiency in operation. The use of compressed air as a cooler ensures guaranteed cooling of the hydraulic fluid, eliminates the ingress of water into it, and reduces the material costs associated with the use of process water.

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  N.Y., with agate

N.M., Ragshaw

Claims (1)

A cooling system for pneumohydraulic mechanisms, comprising a heat exchanger, coolant supply and exhaust lines, an additional cooling unit, characterized in that the used compressed air of the pneumohydraulic mechanisms is used as a refrigerant.