Evaporative unit

 

(57) Abstract:

In the evaporation unit, at least two evaporator connected in series and are arranged one behind the other. The lower evaporator cooling capacity is made in the form of a plate. The evaporator is higher cooling capacity in the form of pipeline and connected in series before the lower evaporator cooling capacity. The lower evaporator cooling capacity is the plot with the area of injection of the refrigerant, which is sufficiently thermally isolated from the rest of the surface of the fins of the evaporator. The use of the invention to simplify and improve the technological connection of evaporators each other. 8 C.p. f-crystals, 2 Il.

The invention relates to evaporative unit with at least two spaced each other with a serial connection, loaded from the compressor with the refrigerant through the injection site evaporators different cooling capacity, and the lower evaporator cooling capacity is made in the form of a sheet, while the evaporator is higher cooling capacity equipped with a pipeline serving for directions holdem is ombination refrigerator and freezer prior art is the use for cooling freezer section of the so-called box-shaped evaporator. Such evaporators are curved to form a tube of rectangular cross-section supporting plate, which on its surface shell wrapped in the pipeline serving for the direction of the refrigerant. Supporting plate and the pipeline for reasons of ease of processing and heat, as well as economic considerations are made of aluminum, and at the end of the pipeline, located on the side of the inflow, installed by welding intermediate pipe element, which is used for reconciliation by material made of copper butterfly pipeline, which span with the intermediate tubular element. The end of the pipe on the outlet side of the flow, associated with manufactured, for example, by way rolled compounds (Rollbondverfahren), which is used to cool the cooling section of the evaporator, which on the output side of the flow provided by the connection with the fixed therein by welding aluminum pipe piece, which again is welded with is usually made of copper pipe suction pipe. The connection plate evaporator serving as the evaporator for the refrigeration section, before the so-called tube evaporator used in the freezer section, geologicheskikh conditions must be gas-tight and pressure-tight for liquids to connect with each other various materials thanks you need to use special welding methods, such as, for example, a special kind of electric resistance welding, which is suitable for her welding equipment is quite expensive. In addition, the relatively high cost of installation of such evaporative unit due to the large number of separate connected with each other connection points, and additionally should make high demands to the working staff in respect of qualifications and quality of work to ensure that the connections will be made gas-tight and pressure-tight for liquids.

Object of the invention is in the evaporation unit according to the restrictive part p. 1 claims with simple constructive measures to simplify and improve the corresponding refrigeration technology the joint of the two separate evaporators with each other.

This task according to the invention is solved due to the fact that is made in the form of a plate evaporator less cooling capacity is the plot, which is equipped with the injection site for a refrigerant and which is at least sufficiently thermally separated from the rest of the surface liriel copper pipe, used for injection of liquid refrigerant may be injected into the channel for the cooling agent, made the way they connect or z-maintenance and can be installed gas-tight and pressure-tight for liquids with deformation without removing the chip channel for the refrigerant, for example, by stamping, without the need for the preparation of technologically surface and thus expensive welding method for manufacturing space injection of refrigerant. Moreover, the purely mechanical seal by deformation formed in the sheet blank channel for the refrigerant gives the advantage that you can choose the tolerances of form and position between the joined elements is greater than would be possible with this connection by welding. Further, it becomes unnecessary, in contrast to the connection by welding between the parties in the communication, constant tightness at the connection point, as the mechanical connection and seal both parties of the connection relative to each other is characterized by a very high technological reliability. Due to thermal isolation of the site, supplied the place of injection, from the other surface of the plate operitel is) made in the form of lamina, the evaporator of the refrigeration section and according to the destination is served in the evaporator in the freezer section for the production of cold, so cold loss in the evaporator of the refrigeration section are eliminated, at least to a sufficient degree.

According to a preferred variant implementation of the subject invention provides that the plot is adjacent to the location of the injection channel for the refrigerant, which on the output side has an area for connection to the pipeline.

This results not only highly reliable but also extremely precise position using piping of the evaporator in the freezer section, which serves to guide the refrigerant, and the connection between the channel of the refrigerant and piping can easily be obtained by using welding technology, at the same time as the pipeline, and the site has a channel for the refrigerant can be made of the same material, for example aluminum.

Especially quick and targeted supply of injected refrigerant piping of the evaporator is higher cooling capacity is obtained if according to the following preferred exemplary embodiment of predm the desired cold loss on the lower evaporator cooling capacity.P CLASS="ptx2">

In accordance with the following preferred implementation of the subject invention provides that the plot is connected to the other surface of the plate evaporator with at least one made in the form of jumpers connecting section through which on the output side of the flow channel system with refrigerant in the end held on the other surface of the plate, at least in the area close to the injection site.

Thanks to that obtained not only the exact binding location of the site, carrying the injection site, relative to the rest of the surface of the fins of the evaporator, but at the same time reduced the heat transfer from the rest of the surface plate of the evaporator to the plot. In addition, thanks to the input on the output side of the stream end system of channels for the refrigerant on the rest of the surface of the fins of the evaporator are provided economical and due to the principle of airtight connection of this system with the refrigerant to the suction pipe of the refrigerant circuit.

It is especially simple to produce the plot and the rest of the plate surface of the lower evaporator cooling capacity, if according to the following preferred Vesak made as one with the land and made as one piece with the rest of the plate surface of the evaporator. In addition, due to the monolithic connection of the site to the rest of the surface of the plate evaporator is especially accurate location of the first is relatively recent. In addition, made in the form of a plate evaporator lower cooling capacity and the site can be made in a single piece by cutting of aluminum sheet stock.

In accordance with the following preferred implementation of the subject invention provides that the remaining surface of the plate evaporator is located inside the insulation of the refrigerator and connected to the conductive lining provided in the refrigerator refrigerating chamber, while the site is located outside the insulation.

With this design the lower evaporator cooling with injection site the site is located outside the insulation, achieved a noticeable reduction in the noise produced by the injection of liquid refrigerant in the injection site.

Especially easy to produce different cross-sections of the channels with the refrigerant and the different course of the channels with the refrigerant, if according to a further variant of execution of the subject of izobreteniya.

According to another preferred variant of execution of the subject invention provides that the evaporator is higher cooling capacity designed as a formed box-shaped evaporator with molded into the tube support plate and wound it in heat-conducting contact with the pipe.

Thanks to that obtained especially economical option for evaporator freezer section.

Especially reliable gas-tight and pressure-tight for liquids it is possible to connect the pipe to the channel system with the refrigerant evaporator, made in the form of a plate, if according to the latest preferred variant implementation of the subject invention provides that the piping on the outlet side of the flow through the point of connection of the evaporator is connected to the channel system with the refrigerant rest of the surface of the fins of the evaporator.

The invention is illustrated in the following description on the basis of a simplified illustration in the drawings of the exemplary embodiment. When you do this:

Fig. 1 - the evaporative unit formed from the evaporator in the freezer section and located sequentially after the evaporator cooling section located on, at least up to the position, rear view, and

Fig.2 - the evaporative unit, rear view.

In Fig. 1 in a simplified schematic image shows the evaporation unit 10 with the evaporator 11 freezer section, which has, for example, formed of aluminum sheet carrier pipe 12, recourse to the insulation of the refrigerator surface 13 of the shell which is used to supply refrigerant pipe 14, which at its both ends respectively provided with connecting element 15 or 16 and which consists of an aluminum tube, which is fixed with heat-conducting contact on the surface 13 of the shell. To increase the heat transfer surface of the pipe 14 to the surface 13 of the first shell at its free surface supplied covered with aluminum adhesive tape, which is attached to the surface 13 of the shell of the carrier pipe 12. The carrier pipe 12 at its back side is equipped with made of aluminum sheet with a back wall 18, which together with the carrier pipe 12 and is wound on her pipe 14 forms designated as so-called box-shaped evaporator 11 freezer section. For him when serial connection is represented purely schematically, manufactured, e.g. the two sheet blanks of aluminum, the construction of which has a first portion 20 of the plate, which is formed as a so-called evaporator with cold wall (Coldwall evaporator) and has a system of 21 channels with the refrigerant, constructed in the form of a meander, which at its located on the side of the inflow end flows into the jointly formed in the portion 20 of the plate place the connection 22 and which at its located on the side of either a thread exit end has a section 23 of the channel. He goes through one of two located at a distance from each other, allowing for thermal separation of the intermediate space between the jumper connecting parts 25. Such jumpers connecting parts 25 are connected integrally with the portion 20 of the sheet workpiece, and with the second, related to the evaporator 19 refrigerated section by section 26 of the fins of the evaporator, which on its surface is much larger than the surface area 20 of the fins of the evaporator, and which is made mostly rectangular, with one of its longer sides of the rectangle attached to the connecting sections 25.

Section 26 of the fins of the evaporator is equipped with the parallel to its longer sides of the rectangle channel is on the side of the inflow end is integrally molded together on the section 26 of the sheet workpiece location 28 of the connection and its located on the side of either a thread exit end is also integrally molded together place 29 connecting to other installation, more precisely explained below pipelines. Channel 27 for the refrigerant at its facing to the site 28 connections are on the side of the inflow area is used for reception is made, for example, of copper throttle pipe 30, which is one of their ends, due to the partial plastic deformation, fixed gas-tight and pressure-tight for liquids in the channel 27 for the refrigerant in the formation of the so-called calibrated surface 31, and the free end of the throttle tube 30 serves as a designated 32 injection for liquid refrigerant. Between 32 injection and place 28 connection, which is fixed by welding receiving in themselves the throttle pipe, made, for example, aluminum suction pipe 33, is provided in 34 mounted for guided through the connecting section 25 section 23 of the channel to the channel 27 for the refrigerant. Channel 27 for the refrigerant on the outlet side of the stream flows into the space 29 of the connection, which is fixed by welding the connecting pipe 35, is made, for example, of aluminium, for which the connection channel 27 for the refrigerant from the pipe 14 is welded with its provided on the side of the inflow connecting element 15. Predmetnoi also aluminium intermediate pipe 36, which is welded from one side with a connecting element 16, and on the other side with the space 22 is connected to the portion 20 of the fins of the evaporator.

During operation of the evaporative unit forcibly circulating (not shown) of the compressor for the refrigerant in the liquid state is directed through the throttle pipe 30 to the injection site 32, which is in accordance with the cooling technology would be given to the evaporator 11 freezer section and which is located in front of him without appreciable loss of heat through a short stretch of the flow of refrigerant formed from a channel 27 for the refrigerant and a connecting pipe 34. From space 32 of the injection refrigerant is symbolically shown by the arrow flows through the channel 27 for refrigerant connection pipe 34 to the pipe 14 of the evaporator in the freezer section, where he had his on the side of the output end via a pipe 36 enters the downstream evaporator 19 refrigerated section.

There he runs through his system 21 channel for the refrigerant before the refrigerant through section 23 of the channel on the connecting section 25 will go into the suction pipe 33.

Instead of made in the form of boxes of the evaporator 30 freezer section is than necessary at different heights evaporative tiers.

1. Evaporative unit with at least two spaced one behind the other in a serial connection, loaded by the refrigerant from the compressor through the injection site evaporators different cooling capacity, and the lower evaporator cooling capacity is made in the form of a plate, while the evaporator is higher cooling capacity equipped with a pipeline serving for conducting refrigerant and is connected in series before the lower evaporator cooling capacity, characterized in that it is made in the form of a plate evaporator lesser cooling capacity has a section (26), which supplied the place of injection and which is at least sufficiently thermally isolated from the rest of the surface of the fins of the evaporator.

2. Evaporative unit on p. 1, characterized in that the section (26) is adjacent to the location of the injection channel for the refrigerant, which on the outlet side of the flow has an area of connection to the pipeline.

3. Evaporative unit on p. 2, characterized in that the channel for the refrigerant at the site (26) is minimized in length.

4. Evaporative unit on one of the PP. 1-3, characterized in that uchiki connecting section, through which are on the side of either a thread exit end of the channel system with the refrigerant on the rest of the surface, at least in the area close to the injection site.

5. Evaporative unit on p. 4, characterized in that the jumper connecting section is made as one piece with the section (26) and made as one piece with the rest of the surface of the evaporator.

6. Evaporative unit on one of the PP. 1-5, characterized in that the remaining surface of the plate evaporator is located inside the insulation of the refrigerator and connected to the conductive inner shell provided in the refrigerator refrigerating chamber, at that time, as the plot (26) lies outside of the insulation.

7. Evaporative unit on one of the PP. 1-6, characterized in that it is made in the form of a plate evaporator is made by way of rolled or z-connection.

8. Evaporative unit on p. 1, characterized in that the evaporator greater cooling capacity is formed as a formed in the form box vaporizer with formed in the tube support plate and wound at her with heat-conductive contact with the pipe.

9. Evaporative unit is on the plate of the evaporator is connected to the channel system with the refrigerant rest of the surface of the fins of the evaporator.

 

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