SU1204641A1 - Cooling unit - Google Patents

Description

The invention relates to a plant for cooling, especially to a cooling tunnel for directionally gradually cooling heated bodies, preferably castings. The castings, after separation from the molding materials, have a temperature between 400 and 650 ° C. But there is

technological requirement that the castings during the sequential cleaning should have a working temperature of not more than 60 ° C.

Closest to the present invention is a cooling unit, comprising a housing divided into zones of preliminary, primary, final cooling, a conveyor, a gas and liquid supply device, including supply and exhaust pipe nozzles, gas supply nozzles, pipes with feed openings liquids placed in nozzles in the zone of main cooling (German Patent No. 2432765, cl. С 2i D 1/62, 1977).

However, in a known installation in the pre-cooling zones, heating of the chamber walls is unavoidable due to the high part of the radiation heat. This is the case when air is used as a cooler. The surrounding working conditions affect not only the wear of the quench chamber, but also the surrounding workplaces. In addition, when using liquid cooling substances, it is necessary to work with a nozzle. In order to achieve a greater spray effect, a large amount of cooling liquid is required and only a small part of the liquid actually acts for cooling, which goes directly to the hot substance and evaporates there.

A significant part of the cooled liquid is collected in the lower part of the cooling tunnel and does not participate in the cooling process. With a low throughput capacity of the cooled liquid, a small diameter of the cross section of the spray nozzle is required, and a consequence of this is frequent failure of the nozzle, since during repeated use the coolant is contaminated.

The purpose of the invention is to reduce the illumination of the housing, reducing the amount of coolant.

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The goal is achieved by the installation for cooling, mainly castings, comprising a housing divided into zones of preliminary, basic and final cooling, a conveyor, a gas and liquid supply device, including pipes, inlet and outlet gas nozzles, pipes with openings for fluid supply, placed in the nozzles in the main cooling zone, are equipped with an automatic liquid supply device, and the casing in the pre-cooling zone is made with double walls, in the inner sides x walls which tsypolneny slot, wherein the gas inlet and outlet tubes connected to the housing.

0 In the cooling unit, the gas inlets are connected to the inner wall of the casing, and the gas outlet pipes are connected to the outer wall.

In the installation for cooling, the gas inlet pipes are connected to the outer wall of the casing, and the gas outlet pipes are connected to its inner wall. In the cooling unit, the automatic liquid supply device is made in the form of a sectional tank with two sections, one of the sections is connected to a gas supply pipe and a liquid supply pipe, and the other section to a pipe

5 drainage, with a hole in the lower part of the adjacent wall of the container.

FIG. 1 shows a plant for cooling, a general view; Fig. 2 shows a cross section of the pre-cooling zone of the installation; in fig. 3 is a cross-section of the pre-cooling zone of the installation (option for the introduction of a cooler);

 in fig. 4 - scheme of the nozzle; in fig. 5 is a scheme for supplying and dispensing a cooler.

The cooling unit comprises a housing 7, with flaps 11 and 51

0 at the inlet and outlet, conveyor 3, inserted in the form of a plate conveyor. The casing has accumulators 8 arranged above and below, formed by a wall 9 in which nozzles 10 are made for supplying gas. The casing is divided into zones 4, 5 and 6 of preliminary, primary and final cooling.

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The pre-cooling zone can be made in two versions.

The casing 7 in this zone is made with double walls, while the inner wall has slots 17 located almost at the level of conveyor 3. Gas is supplied to the pre-cooling zone through pipe 12, which can be connected to the inner wall (FIG. 2) or the outer wall (Fig. 3), and the nozzles 18 of the gas outlet can be connected or with the outer wall of the casing 7, or with the inner wall.

 In the zone 5 of the main cooling, water supply devices are installed at the top and bottom, made in the form of pipes 31 with holes 39 installed in the gas supply nozzles 30.

The main cooling zone is equipped with an automatic coolant supply device - liquid, made in the form of a tank 33, divided by a wall 20 into two sections ЗЗа and ЗЗв, which are interconnected through an opening 36, fulfilled in the lower part of the wall. Section ZZa connected to the pipe 28 of the gas supply and the liquid supply pipe, and the section ZZv with pipe 26 of the liquid outlet

The device for the automatic supply of the cooler is connected through a pipeline to the heat exchanger 13 with the tank 41.

The gas (air) is sucked into the zone from the environment through the pipe 28 or from the final cooling zone and is fed to the accumulator 8.

The final cooling zone is connected to the pipe 49 for supplying fresh gas (air). Once used for final cooling, the fan and heat exchanger 28 are supplied through a pipeline to the gas inlet nozzles 12 of the zone.

The cooling unit operates as follows.

After the moldings 2 have been released from the molding materials, they are loaded onto the conveyor 3 and directed through the valve 11 into the pre-cooling zone-4 by the gas supplied through the nozzles 12 from the final cooling zone 6;

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additional purification of air from zone 6 and, moreover, the air from zone 4 was already heated, this avoids the undesirable effect of the castings 2 self-stress state 2. Since the cooled air from zone 6 also cools non-evaporating heated water 14 of zone 5, this heat is in the form of an additional surface - the temperature is transferred to the air.

The cooled air is sucked in with the help of the fan 15 through the pipe 12 into the upper and lower nap 15 and from there it flows through the nozzles 10 at high speed into the pre-cooling zone 4. Nozzles can be both round and slit-like. Air cooled

20 goes straight to hot castings 2.

The removal of gas occurs through the slots 17 from the side of the conveyor 3.

25 This doubles the outer casing. Most of the heat is released in zone 4, and therefore the casing 7 cannot be directly heated, since slot 17 is this part

3Q released heat absorbs. The casing 7 is heated only to a minor extent by convection,

In the case of the connection of the nozzle 12 with the outer wall, the gas is fed through the slot 17 to the conveyor 3. The gas touches the casting 2, is heated and exits through the exit slit of the pre-cooling zone 4. Because of the double casing-and the heat output from. the pre-cooling zone is avoided, while the relatively cold air from zone 6 causes additional cooling of the outer wall 7.

The exhaust gas through the filters can be returned to zone 6 of the final cooling.

50 Next, the castings 2 enter the main cooling zone 5. In zone 5, castings 2 are cooled from above and below by water sprayed with air supplied from nozzle 30. Water supplies 55 s to pipes 31 under constant pressure, supported by an automatic liquid supply device.

This adaptation functions as follows.

The water level in the tank 33 is controlled by a floating valve 34 in the nozzle 35, If the installation does not work, i.e. the supply is disconnected, then the water level reaches the lower end of nozzle 35 of tank 33. It is divided into two sections 33 q and 33J, they are connected under water by an opening 36 and section 33 a is connected to spray water (nozzle 28) to the cooling air supply . If the installation is working, i.e. the air supply is connected, then the corresponding differential pressure of the used fan is built in the tank 33, which is associated with a simultaneous decrease in the water level in this tank. According to the laws of the communicating vessels in section 33 S, the water level rises above the nozzle 35, so that water may leak out to the pipes 31. The leaked water can be added through the floating valve 34 in the nozzle.

Since only a small part of water 14 evaporates during cooling, the bottom wall in zone 5 is made trough-shaped, it is possible to store non-evaporated water 14 here. This water is removed through conduit 40 and flows into tank 41, in which sediment of solid parts occurs. mixes. The remaining sludge C sludge) is continuously transported through a conveyor (not shown) from tank 41. Water 14 from tank 41 is far

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through the heat exchanger 13 and the pump 43 is introduced into the tank 33, so that a circuit occurs.

The inevitable loss of water is leveled by another floating valve 44 on the sediment tank with fresh water. At the end of zone 5, castings should have a temperature of 70 ° C. Castings 2 on conveyor 3 come through valve 48

10 in zone 6 of the final cooling, which is constructed similarly to zone 4 (, fig. 3). The castings are dry with low internal voltage and without tension through the valve 51 s.

15 with a temperature of less than 60 ° C, and they are brought on conveyor 3 to the surface cleaning machine by a shot blasting method (not specified).

The significant advantages of a cooling installation are:

This results in a significant improvement in the whole process of cooling castings with a significant reduction in the length of the cooling section and a corresponding decrease in

economic costs; are created before. parcels for mass production with automated production and at the site of unloading-cleaning with co30 responsible saving of manpower and means of transport; open

, opportunities to integrate the cooling and cleaning process,

In addition, the installation allows to automate the flow of liquid and thereby ensure uniform cooling, internal stress and eliminates the formation of cracks.

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Compiled by H. Kuzovkina

 Editor A, Avramenko Tehred A.Ach; Proofreader M. Demchik {

Order 8493/26 Circulation 552 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

Pus.S

Claims (4)

1. INSTALLATION FOR COOLING- NII mainly castings, containing a casing, divided into zones of preliminary, main and final cooling, a conveyor, a gas and liquid supply device, including pipes for their supply and removal, gas supply nozzles, pipes with holes for supplying liquid, placed in nozzles in the main cooling zone characterized in that the installation is equipped with an automatic fluid supply device, and the casing in the pre-cooling zone is made with double walls and in its inner side walls. while the inlet and outlet of the gas are connected to the casing. 2. Installation according to π. 1, characterized in that the gas inlet pipes are connected to the inner wall of the casing, and the gas outlet pipes are connected to its outer wall. 3. Installation according to π. 1, characterized in that the gas inlet pipes are connected to the outer wall of the casing, and the gas outlet pipes _β to its inner wall 18. 4. Installation according to π. 1, the fact that the automatic fluid supply device is made in the form of a sectional container with two sections, one of the sections is connected to the gas supply pipe and the liquid supply pipe, and the other section to the liquid discharge pipe while a hole is made in the lower I part of the adjacent wall of the container. 1 1204641 ²