SU1392326A1 - Arrangement for heat supply of process objects - Google Patents

Abstract

The invention relates to devices for processing plastics and can be used for heating and cooling elements of technological lines based on worm extruders, roller machines, as well as units in the chemical, food and other industries. The purpose of the invention is to increase the productivity of technological objects due to the intensification of the heat exchange process. For this, the device contains a heating and cooling element. Is he . , is mounted with the possibility of contacting the technological object and is connected with the means for circulating the heat transfer medium. The latter is placed in a tank with coolant. The device contains a cooling source, which is located in the tank. The means for circulating the coolant is made in the form of a driving drum. It is rotatably mounted and mechanically coupled to the electric motor. The heating and cooling element is made in the form of endless closed turns of tape with a capillary-porous structure. They are mounted with the possibility of coverage of the technological object and the drive drum. The device is additionally equipped with a heat source placed in the tank. When the driving drum rotates, the belts are set in motion, they are placed in the tank with heat-transfer agent, and the heat carrier is transferred from the tank to the technological object. Then they slide along its surface, again descend into the tank with coolant, and close the circuit of the coolant. 1 hp f-ly, 4 ill. about (lu so 1CHE p5

Description

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The invention relates to devices, l heat supply technological, tjOibeKTOB for processing plastic lacc and can be used to heat the elements of the technological lines based on the worm to exporters, roller machines, as well as various units in the chemical, food and other industries industrial | |,

I The purpose of the invention is to increase the production capacity of technological objects due to the intensification of the heat exchange process,

I Fig. 1 shows a device I for heat supply of technological I objects, for example a roll; in fig. 2 -; section A-A n FIG, 1; in fig. 3 - a device for heat supply of technological objects, for example an extruded plastic pipe; FIG. 4 is a section BB in FIG. 3

Device for the heat supply of those

Nologic objects contain heat 25 its covered with a porous substance 18,

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Cooling element. It is mounted with the possibility of contacting the technological object and is connected with the coolant circulating fluid placed in the tank 1 with the coolant. The device keeps the cooling source 2 installed in the tank 1 with the coolant between its bottom and the means for circulating the coolant. It is made in the form of a cooling element, Means for circulating the coolant in the form of a driving drum 3 mounted for rotation and mechanically associated with; electric motor 4, which is equipped with a device. The heating-cooling element is made in the form of endless closed turns of the tapes 5 with a capillary-porous structure for wetting them with a coolant} mounted with the possibility of bhwat technological object and the driving drum 3,

The device is additionally equipped with a heat source placed in the tank 1 with coolant between its bottom and the means for circulating the coolant. Oak is made as a heating element 6. In an embodiment of the device, the drive drum 3 is equipped with a propeller 7, the drive drum 3 is made with a corrugated outer by the surface. It is equipped with a working fluid, for example ethanol, which causes heat transfer inside the roll 12 to the principle of a heat pipe. Roller 12 is also provided with at least one scoop 19 for transferring excess working fluid from its working part to the heat exchange section of trunnion 1 in heating mode of roller 12.

When executing the technological object in the form of an extrudable pipe, the tapes 5 are mounted with the possibility of reaching the drive drum 3 of the extruded pipe. For a better coverage of the extruded pipe, the device is additionally equipped with guide axes 20. To eliminate the displacement of the closed turns of the tapes as a result of axial movement of the ejected pipe, restrictive bats 21 are made on the drive bar 3.

The device works the next time.

When the technological object is executed in the form of a rotating roll 12, a heating source 6 is turned on, the drive drum 3 is rotated from the electric motor 4, not only the direction of rotation of the roll 12 55 of the drive drum 3 opposite the corrugated outer surface of the drive drum 3 prevents the tape from slipping through it

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8, and connected to the electric motor 4 by means of an axis 9 with a seal 10. The propeller 7 is rigidly fixed on the axis 9. The tapes 5 can be made of natural woven materials, for example burlap.

The device also includes a temperature sensor 11 for measuring the temperature of the outer surface of the technological object, such as roller 12. It is mounted rotatably (drive not shown). The temperature sensor 11 is connected via the temperature controller 13 to the electric motor 4, as well as to the heating elements 6 and cooling 2. The roller 12, as a technological object, is provided with pins 14 and 15. The latter are installed with the possibility of rotation in the bearings 16 and 17 slide, respectively. The inner cavity of the roll 12, including the trunnion 15, is sealed, the walls

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impregnated with a working fluid, such as ethyl alcohol, which causes heat transfer inside the roll 12 according to the principle of a heat pipe. The roller 12 is also provided with at least one scoop 19 for overflow of excess working fluid from its working part to the heat exchange section of the trunnion 15 in the heating mode of the roll 12.

When performing a technological object in the form of an extrudable pipe, the belts 5 are mounted with the possibility of reaching the drive drum 3 and the extruded pipe. For a more complete coverage of the extruded pipe, the device is additionally equipped with guide axes 20. To eliminate the displacement of the closed turns of the tapes 5, axial movement of the extruded pipe is performed on the drive drum 3 by the limiting shoulders 21.

The device works as follows.

When the technological object is executed in the form of a rotating roller 12, a heating source 6 is turned on, and the driving drum 3 is rotated from the electric motor 4, and the directions of rotation of the roller 12 and 5 of the driving drum 3 are opposite. Corrugated outer surface of the drive drum 3 eliminates the possibility of slipping on it the tape 5,

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as a result, slippage of the belt 5 over the smooth heat exchange area of the trunnion 15 is ensured.

The capillary-porous structure of the tape 5, which is saturated with the heat carrier heated in it .1, transports it to a colder pin 15, the temperature of which is heated as a result of heat exchange with the heat carrier. At the same time, in the pin 15, the working fluid evaporates with which the porous substance 18 is impregnated in the inner cavity of the roll 12. The vapor of the working fluid moves into the working part of the roll 12, condenses there on its walls, giving off the heat, and the condensate flows into the lower part of the roll 12. Due to the rotation of the roll 12 with the scoop 19, the condensate is continuously poured from the working part of the roll 12 into the trunnion 15, closing the circulation circuit of the working fluid inside the roll 12.

Simultaneously with the driven drum 3 in the tank 1 with the coolant, the propeller 7 rigidly mounted on the axis 9 rotates. This ensures the circulation of the coolant inside the tank 1, which intensifies the heat transfer on the surfaces of the sources of cooling 2 and heating 6 and promotes temperature equalization the volume of coolant in the tank 1. This intensifies the heat transfer in the device and increases the performance of the technological object, roll 12.

If it is necessary to cool the working surface of the roll 12, the heating source 6 is turned off and the cooling source 2 is turned on, the temperature of the coolant in the tank 1 is lowered. As a result of heat exchange between the heat transfer medium, which fills the capillary-porous structure of the tape 5, and the trunnion 15, the temperature of the latter decreases and the working fluid in the inner cavity of the roll 12 "Condensate drains by gravity from the strips begins to condense on its inner wall. - these trunnions 15 into the working cavity of the roll 12, where the circuit of the working area inside the roll 12 is evaporated; the application of the heat pipe principle for heat transfer inside the roll 12 ensures uniformity and high accuracy of maintaining the temperature Atura on his work surface.

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In the case of automatic control of the temperature of the working surface of the roll 12, the signal from the temperature sensor 11 is supplied to the temperature controller 13, which controls the switching on of the sources of heating 6 and cooling 2, as well as the speed of rotation of the electric motor 4, the driving drum 3. At the same time o-E (it changes both the temperature of the coolant in the tank 1 and the intensity of heat exchange between the coolant and the technological object, i.e. roll 12, by changing the speed of movement of the belts 5 with capillary-porous structure

When using the device, a silicone fluid can be used as a coolant, for example, copolymer-5, operating in the temperature range 15–250 ° C, and as the 5 tape with a capillary-porous structure, a carbon-graphite fabric cavity of the UGT-2 type, having low coefficients friction sliding on the surface of the technological object. The movement of the closed turns of the belts 5 is carried out with a linear velocity within O, 1-1, O m / s.

Due to the good wettability of the tapes 5 by the coolant in the tank 1, it quickly enters the pores of the tapes 5 and is retained in the pores during transportation from the tank 1 to the technological object. When the ribbons slide on the surface of the technological object, heat exchange takes place between the last and saturating the tape 5 and the heat transfer medium, accompanied by intensive mass exchange inside the tapes 5 due to capillary forces and the temperature difference on their inner and outer surfaces, which occurs during heating or cooling the process object depending on its mode of operation.

When the section of the belt 5 comes out of contact with the technological object due to heat and mass transfer processes in the tank 1, the temperature of the heat carrier in the pores again takes on the value corresponding to its temperature B of tank -1, and the belt portion 5 again goes to the process object, the circuit closes. Due to the change in the linear speed of movement of the belts 5, the speed changes accordingly. The flow of these processes in the belt 5 and on the roll B 12 over B jpxHocTH, which also regulates the heat transfer rate of the heplone carrier with the technological object, i.e. roll 12 in this case.

As a result of the continuous slipping of the tapes 5 over the surface of the technological object on this surface, no decomposition products of heat-transfer agent or other deposits are formed that increase heat transfer, as is the case with other methods of supplying heat-transfer agent to the technological object. In addition, when the heat sink is supplied by means of ribbons 5 with a capillary-porous structure, there is an uninterrupted mechanical destruction of the Wall laminar layer of the heat transfer fluid on the heat exchange surface of the technological object with a moving tape 5. Eliminate this layer, which is main thermal resistance in the heat flow path, contributes to the intensification of the heat exchange process.

 When the technological object is in the form of an extruded pipe 22j, it moves in the axial direction, and the driving drum 3 is driven by the rotation of the electric motor 4. As a result, the belts 5 are driven, in which pores the heat carrier from the tank 1 is transported to the surface of the pipe 22. Due to the contact of the coolant with the pipe 22 and heat and mass transfer processes in the pores of the belts 5 when it is immersed in the tank 15, the heat is removed from the tube 22 to the coolant in the tank 1. Constant temperature of the coolant in the tank 1 Device steady operation is maintained using the cooling source 2 made of, for example, in this case in the form of a coiled heat exchangers. , A propeller 9 provides for the circulation of coolant inside the tank, which intensifies the heat exchange between the belts 5 and the cooling source 2.

The water used in this case as a heat transfer fluid does not wet the tube 22. Therefore, in the case of cooling the tube 22 by spraying water, no contact is provided to the heat transfer medium and the tube 22 over the entire surface, which impairs heat transfer. When cooling the pipe 22 in

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LATERABLE, the water flow and the mass and dimensions of the device increase significantly.

The use of the proposed device allows to significantly intensify the heat exchange, which, given the overall dimensions of the device, leads to an increase in productivity, refusing to use bulky means of transporting the coolant from the tank to the process object (pump, pipelines, stop valves), to provide heat to the moving technological objects as perfect as possible. so also translational movement. At the same time, in the processing facility it is not necessary to carry out traditional heat exchange channels for the heat transfer medium, which simplifies its design and reduces the cost. The elimination of pipelines and valves, in addition to simplifying the design of the device, reduces the heat loss to the environment.

Claims (2)

1. Device for heat supply of technological objects, containing a heating and cooling element, mounted with a possibility of contact with a technological object and connected with means for circulating a heat transfer fluid placed in a container with heat carrier, and installed in a capacity tank with heat carrier between its bottom and the means for the circulation of the coolant cooling source, characterized in that, in order to increase the performance of technological objects by counting the intensification of the heat exchange process, To circulate the coolant is made in the form of a drive drum mounted for rotation and mechanically connected to the electric motor with which the device is provided, and the heating cooling element is made in the form of endless closed turns of capillary-porous structure for wetting them with coolant, mounted with the possibility of embracing a technological object, and a driving drum, and the device is additionally equipped with is located in a tank with heat 713923268 between her bottom and the medium 2. A device according to claim 1, characterized in that the driving drum is provided with a propeller screw. for the circulation of the coolant heat source ; / 13 Fi9.2 55 hfshA 22