RU2073960C1 - Microwave heating device - Google Patents

Abstract

FIELD: microwave engineering. SUBSTANCE: device has microwave heating chamber built up of bottom and top split boxes, microwave energy lead-ins, and transport device built up of three movable drums for receiving parts to be treated partially immersed in energy-absorbing liquid. Drums are arranged on common shaft and rigidly fixed with it; they are provided with similar number of cells arranged along same line. At bottom, drums are installed in a spaced relation around metal half-cylinder whose inner surface has at least two parallel helical ribs whose height is slightly smaller than gap between drums and half-cylinder. EFFECT: improved design. 2 dwg

Description

 The invention relates to microwave technology, in particular to devices for microwave heating.

 A device for microwave heating is closest to that proposed in terms of technical nature and the achieved result, selected as a prototype.

 It includes a microwave heating chamber, consisting of lower and upper detachable boxes, a vehicle formed by 3 conveyors: two external for loading and unloading the processed products and an internal one for moving the processed products inside the working chamber, and microwave energy inputs.

 The upper box is inserted into the bottom, while the bottom box is filled with an energy-absorbing liquid (PLL), in most cases water, into which the edges of the upper box are immersed.

 On the walls of the lower duct (at the external conveyors), 2 movable drums are installed, completely immersed in the EPG, the surface of which is tightly adjacent to the lower and upper ducts. On the surface of the drums made cells to accommodate the processed products, and the cells are not cut to the edges of the drums.

 When the drum rotates, the products are transferred from the external (loading) conveyor to the internal, and then again to the external conveyor for unloading the processed products from the working chamber.

 The products are heated under the influence of microwave energy entering the working chamber through the waveguides.

 The input into the chamber and the output of products from it takes place under the EPG layer, which provides reliable protection against microwave energy coming out of the working chamber (Japanese application No. 51-17734, Cl. H 05 B 9/06).

 However, this device for microwave heating has a number of significant drawbacks directly related to the design of its transport device.

 Firstly, the internal conveyor (lamellar, with rubbing joints between the elements, or tape) must be made of radio-transparent materials such as fluoroplastic, ceramics, organosilicon fiberglass, quartz, etc. which, with this design, do not have a combination of the necessary properties wear resistance, mechanical strength and sufficient heat resistance.

 Secondly, for the belt and plate conveyors used in this design, special devices are needed to maintain and tension their bearing surface. The presence of these devices, as well as the large extent of the areas of input and output of products from the device increase its mass, dimensions and make it bulky.

 Thirdly, a prerequisite for the functioning of such a transport device is a strict synchronization of the operation of all its elements, because otherwise, even with a slight non-synchronism, the processed products will not be able to get from the external conveyor to the internal one and vice versa.

 So, the main disadvantages of this device for microwave heating are its complexity, lack of reliability and cumbersome due to the design of its transport device.

 The objective of the invention is to provide a simple, reliable and compact device for microwave heating.

 The problem is solved in that in a device for microwave heating, including a chamber for microwave heating, consisting of lower and upper detachable boxes, microwave energy inputs and a transport device consisting of two movable drums with cells for accommodating workpieces partially immersed in EPL, the transport device is made in the form of 3 movable drums located on the same axis and rigidly attached to it, having the same number of cells placed on the same line. The drums below with a gap bend around, for example, a metal half-cylinder, on the inner surface of which at least 2 parallel parallel helical ribs are made, the height of which is slightly less than the gap between the drums and the half-cylinder.

 We have not found any technical solutions with similar distinctive features.

 Figure 1 shows a General view of the proposed device for microwave heating in the context. Figure 2 shows a side view of the proposed device for microwave heating in section.

 The proposed device for microwave heating contains a transport device made in the form of 3 movable drums 1,2 located on the same axis and rigidly attached to it. All three drums 1,2 have the same number of cells 4 cut along the entire length of the cylindrical surface of the drums 1,2, while cells 4 of all three drums 1,2 are placed on the same line, strictly opposite each other (3 on one line).

 The extreme drums 1 can be made of metal, and the part of the middle drum 2 remote from the axis 3 is made of radio-transparent materials. The middle drum 2 is covered from above by the upper metal box 5.

 Axis 3 is mounted on supports 6, to which a metal half cylinder 7 is attached, with a gap enveloping the drums 1.2 from the bottom, and attached to the drive 8.

 At least 2 parallel parallel helical ribs 9 are made on the inner surface of the half-cylinder 7, the step between which depends on the number of ribs. Drums 1,2 together with supports 6 and half cylinders 7 are installed in the lower box 10, filled to a certain height of the EPJ 11.

 If necessary, the extreme drums 1 can also be covered with boxes (not shown in the figure).

 Microwave energy through the waveguides 12 enters the working chamber 13, formed by a detachable upper duct 5 and the lower duct 10. A seal 14 is made in the wall of the lower duct 10 through which the drive shaft 8 for rotating the drums connected to their axis passes.

 The working chamber 13 is filled with EPG 11, from which a part of the middle drum 2 protrudes.

 The device operates as follows.

 The processed products 15 via an external conveyor (not shown in the figure) enter the cells 4 of one of the extreme drums 1. When all the drums 1,2 rotate during the rotation of the drive shaft 8, the processed products are sequentially immersed in the EPG 11. With further movement of the drums 1.2 one of the screw ribs 9 provides a gradual movement of the products 15 from the outermost drum 1 to the middle drum 2. By the time the cells 4 of the drums 1,2 come out of the EPL 11, the workpieces 15 are completely moved to the corresponding medium cells its drum 2 and fall into a treatment zone of the microwave energy supplied by waveguides 12.

 The process of processing microwave energy occurs during the period from the output of the products 15 from the EPL 11 to the entrance to it. After the second immersion of the processed products 15 in the EPG 11, another screw rib 9 ensures their gradual movement from the middle drum 2 to the corresponding cells of the second extreme drum 1. By the time the cells 4 exit the EPG, the processed products are completely moved to the corresponding cells 4 of the drum 1. After that the processed products 15 may be in any known manner (using any known device) loaded onto another external conveyor.

 Compared with the prototype of the proposed device for microwave heating has the following advantages.

 The internal conveyor of the proposed device, part of which is made of radiolucent material, has no rubbing joints, which greatly simplifies the choice of structural materials and increases the reliability of the entire transport device, and therefore the reliability of the entire device for microwave heating as a whole.

 The design of the transport device, the main element of which is 3 movable drums, is much simpler, due to the lack of special devices to support the bearing surface of the conveyor.

 The compactness of the proposed device is achieved mainly by combining input and output devices with a device for moving them inside the working chamber.

 In addition, for the manufacture of the device does not require sophisticated equipment. The device is made of simple parts that do not need to be adjusted. Greater accuracy is also not required in the manufacture of parts, since this does not affect the operation of the device.

Claims (1)

 A device for microwave heating, including a chamber for microwave heating, consisting of lower and upper detachable boxes, microwave energy inputs and a transport device made in the form of movable drums with cells for accommodating workpieces partially immersed in an energy-absorbing liquid, characterized in that the transport device is made in the form of three movable drums located on the same axis and rigidly fastened with it, having the same number of cells placed on the same line, the drums bend around the bottom with a gap a metal half-cylinder, on the inner surface of which at least two parallel parallel helical ribs are made, the height of which is slightly less than the gap between the drums and the half-cylinder.

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