CN1157583C - Evaporator system - Google Patents

Abstract

The invention relates to an evaporator system (10) having at least two evaporators actuated by means of a condenser with coolant which is delivered via an injection position (32). Said evaporators have differing refrigerating capacities and are arranged one behind the other such that they are connected in series. The evaporator having a lower refrigerating capacity (19) is constructed in a plate-like manner, whereas the evaporator having a higher refrigerating capacity (11) is provided with a conduit (14) for guiding the coolant and is connected in series before the evaporator having a lower refrigerating capacity (19). The plate-like evaporator having a lower refrigerating capacity (19) has a section (26) which is provided with the injection position (32) for the coolant and which is at least thermally decoupled to the greatest possible extent from the rest of the plate surface (20) of the evaporator (19).

Description

evaporator unit

technical field

The invention relates to an evaporator device with at least two evaporators of different refrigerating capacity installed in series one behind the other and supplied with refrigerant by a condenser through an injection point, wherein the evaporator with the lower refrigerating capacity is made as a plate shape, while the evaporator with higher cooling capacity is equipped with a pipe for guiding the refrigerant, and the evaporator with lower cooling capacity is connected in series in front.

Background technique

For combined refrigeration and freezing, so-called box evaporators are used in the prior art to cool the freezer compartment. Such evaporators have a carrier plate bent into a right-angled tube, which is wound with refrigerant-conducting lines on its mounting surface. In order to simplify the processing and take into account heat conduction and cost reasons, the carrier plate and the pipeline are made of aluminum, a tube insert is provided at the inflow-side end of the pipeline, which is used for connecting the joint made of copper. The flow line material is matched, and the throttling line is welded with the tube insert. The outflow-side end of the line is connected to an evaporator plate produced, for example, by the roll-bond method (Rollbondverfahren) for cooling the cold room, on the outflow side of the evaporator plate there is an A joint for an aluminum pipe fitting that is in turn welded to an inlet pipe usually consisting of copper piping. This upstream connection of the evaporator plate used as a cold room evaporator with so-called tube evaporators used in the freezer, in addition to the large number of parts, also results in the necessity of combining different materials within cost and production conditions. A liquid-tight and gas-tight interconnection necessitates the use of special welding methods, such as special forms of resistance welding, for which suitable welding devices are relatively expensive. Furthermore, the installation costs of such evaporator arrangements are relatively high due to the large number of individually joined joints, wherein high demands are also placed on the quality and precision of the workmanship in order to ensure a liquid-tight and gas-tight production of the joints.

Contents of the invention

The object of the invention is to simplify and improve the refrigeration-compatible interconnection between the two individual evaporators with simple constructional measures for the evaporator arrangement described at the outset.

This object is achieved according to the invention in that the plate-shaped evaporator with a lower cooling capacity has a second plate section which is equipped with injection points for the refrigerant and is connected to the rest of the evaporator with a lower cooling capacity. The thermal technology of the first plate section is separated.

By attaching the injection point to the plate evaporator, the copper pipe for injecting liquid refrigerant can be introduced into a refrigerant channel manufactured by rolling joint method or Z-joint method (Z-Bondverfahren) and can be The liquid-tight and gas-tight mounting of the refrigerant channels, for example by punching, does not require a mechanically complex and thus cost-intensive welding method for producing the preparation of the injection points for the refrigerant. In addition, this purely mechanical seal through the formation of the refrigerant channels formed in the plate offers the advantage that the shape and positional tolerances between the connection pairs can be chosen to be lower than would be possible with welding between the connection pairs. Large tolerances. Furthermore, in contrast to welding between connection pairs, frequent tightness checks of the joints are not necessary, since the mechanical connection and sealing between the two connection pairs is guaranteed with high process reliability. Due to the heat separation between the second plate section equipped with injection points and the first plate section of the evaporator, it is ensured that the sprayed liquid refrigerant will not evaporate to the evaporator of the plate-shaped refrigerating room connected in series, but comply with the refrigeration regulations input to the freezer evaporator, thereby at least largely avoiding cooling losses to the refrigerator evaporator.

According to a preferred embodiment of the invention, the second plate section has a refrigerant channel adjoining the injection point, the outlet side of which channel has a connection point for a line.

This makes the use of refrigerant-carrying freezer evaporator lines not only particularly safe, but also particularly precise in position, wherein the joint between refrigerant channel and line can be realized without difficulty in terms of welding technology, because not only The pipes and the second plate section with the refrigerant channels can be made of the same material, for example aluminum.

According to a further preferred embodiment of the invention it is provided that the length of the refrigerant channels in this second plate section is minimized, so that the injected refrigerant can be fed particularly quickly and precisely to the evaporator with a higher cooling capacity. In pipeline. In addition, unnecessary refrigeration loss of the evaporator with low refrigeration capacity is avoided.

According to another preferred embodiment of the present invention, the second plate section is connected to the first plate section of the evaporator with a lower refrigeration capacity through at least one bridge-shaped connecting section, and the refrigeration on the first plate section through the connecting section The outflow-side end of the agent channel system is connected to the injection point.

As a result, not only is the second plate section carrying the injection points precisely positioned on the first plate section of the evaporator with a lower refrigeration capacity, but at the same time the distance from the first plate section to the second plate section of the evaporator is Thermal conductivity is minimal. In addition, the introduction of the outlet-side end of the refrigerant channel system on the first plate section ensures a cost-effective and substantially tight connection of the refrigerant channel system to the inlet line of the refrigeration circuit.

According to another preferred embodiment of the present invention, the bridge-shaped connecting section is integrated with the above-mentioned second plate section, and is connected with the first plate section of the evaporator with low refrigeration capacity, then the second plate section and the cooling The production of the first plate section of the lower-capacity evaporator is particularly simple. Furthermore, due to the one-piece joining of the second plate section to the first plate section of the evaporator, a particularly precise positional fit of the former to the latter results. In addition, the plate-shaped evaporator with a relatively low cooling capacity and the second plate segment are integrally manufactured by cutting from an aluminum plate.

According to another preferred embodiment of the present invention, it is provided that the first plate section of the evaporator with a lower refrigeration capacity is arranged inside the heat insulation layer of the refrigeration device and connected to the inner liner of the refrigeration chamber in the refrigeration device in a heat-conducting manner, while The second panel section is located outside the insulation.

The arrangement of the evaporator with a low cooling capacity, in which the second plate section provided with the injection points is located outside the insulation layer, significantly reduces the noise generated by the injection of refrigerant at the injection points.

According to another preferred embodiment of the present invention, the plate-shaped evaporator is manufactured by rolling or Z-connection (Roll-oder Z-Bondverfahren), and it is particularly simple that the evaporator can adopt various refrigerant passages Cross section and refrigerant path.

According to a further preferred embodiment of the invention, it is provided that the evaporator with a higher cooling capacity is designed as a box-shaped evaporator with a tubular carrier plate and a line wound on the carrier plate with heat transfer contact.

A particularly economical variant of the freezer compartment evaporator is thus provided.

According to a last preferred embodiment of the invention it is provided that the outlet side of the line is connected via a connection to the evaporator plate with the refrigerant channel system of the first plate section of the evaporator, whereby the line can be made particularly reliable gas-tight and liquid-tight The ground is connected to the refrigerant channel system of the plate evaporator.

The invention is described below with the aid of a schematically illustrated exemplary embodiment in the drawing.

Description of drawings

Figure 1 is a rear perspective view of an evaporator arrangement consisting of a freezer evaporator and a refrigerating room evaporator connected in series behind it, with a refrigerating room evaporator arranged in an at least largely thermally decoupled Injection point on the second plate section of the evaporator.

Figure 2 is a rear view of the evaporator unit.

Detailed ways

FIG. 1 shows in a simplified schematic diagram an evaporator arrangement 10 with a freezer evaporator 11 having a carrier tube 12, for example made of aluminum sheet, in the direction of the refrigerating appliance insulation. The installation surface 13 of the installation surface 13 is provided with a pipeline 14 for guiding the refrigerant, which is made of an aluminum tube and has a connector 15 or 16 at its two ends, and the aluminum tube is in thermal contact with it on the installation surface 13. In order to increase the heat transfer surface of the pipes 14 on the mounting surface 13 , the former is provided on its free surface with an aluminum-covered adhesive tape which is fastened to the mounting surface 13 of the carrier tube 12 . The carrier tube 12 is equipped on its rear side with a rear wall 18 made of aluminum sheet, which together with the carrier tube 12 and the pipes 14 wound on the carrier tube form a freezer compartment evaporator 11 known as a so-called box evaporator . Behind this freezer evaporator is a purely schematic representation, such as a refrigerating room evaporator 19 manufactured by rolling, which is formed by welding two aluminum plates in a plate-shaped structure with a first plate section 20, which is 20 is designed as a so-called cold-wall evaporator and has a curved refrigerant channel system 21 which flows at its inflow-side end into a connection 22 integrally formed on the plate segment 20 and at its outflow-side end There is a channel section 23 at the top. The channel section 23 is guided by one of two bridge-shaped connecting sections 25 spaced apart from one another, between which there is an intermediate space for thermal-technical separation. The bridge-shaped connecting section 25 is not only integrally connected with the plate section 20 but also integrally connected with the second plate section 26 belonging to the refrigerating room evaporator 19, the surface of the second plate section 26 is significantly smaller than the surface of the plate section 20, and made It is substantially right-angled, wherein a connecting section 25 is connected to its longer right-angled side. The plate section 26 is provided with a refrigerant channel 27 parallel to its longer right-angled side, which runs the entire length of the plate section 26 and is provided at its inflow-side end with a joint integrally formed on the plate section 26 28, which is also provided at its outflow-side end with a joint 29 integrally formed on the plate section 26 for introduction into a pipeline which will be described in detail below. The refrigerant channel 27 is used on its inflow side section facing the connection 28 to accommodate a throttle line 30 , for example made of copper, which is formed at one end by means of a local, The plastic deformation is arranged gas-tight and liquid-tight in the refrigerant channel 27 , wherein the free end of the throttle line 30 serves as an injection point 32 for liquid refrigerant. A joint 34 is provided between the injection point 32 and the connection 28 for the connection of the channel section 23 guided by the connection section 25 to the refrigerant channel 27, wherein a connection for receiving a throttle line, for example, is arranged by welding on the connection 28. Intake pipe 33 made of aluminum. The outflow side of the refrigerant channel 27 is at the joint 29, in which a connecting pipe 35, for example made of aluminum, is arranged by welding technology, and this connecting pipe 35 is welded to the connecting piece 15 on the inflow side of the pipeline 14, so that the refrigerant Channel 27 is connected to line 14 . The connecting piece 16 provided on the outlet side of the line 14 serves to receive an intermediate pipe 36 also made of aluminum, which is welded on the one hand to the connecting piece 16 and on the other hand to the connection 22 on the plate segment 20 .

When the evaporator device is in operation, the refrigerant that is forcibly converted by an unshown refrigerant condenser is input in a liquid state through the throttling tube 30 to the injection point 32, which itself is attached to the freezing chamber in accordance with refrigeration technology to evaporate The device 11 is located in front of the evaporator 11 of the freezing compartment through a very short refrigerant flow path formed by the refrigerant channel 27 and the connecting pipe 34 without significant cooling loss. The refrigerant flows out from the injection point 32, as shown by the arrow, passes through the refrigerant channel 27, connects the pipe 34, flows into the pipeline 14 of the evaporator in the freezing chamber, and flows through the intermediate pipe 36 at the outlet end of the pipeline 14 to the rear connection The refrigerator compartment evaporator 19. Here it flows through its refrigerant channel system 21 and then the refrigerant flows into the inlet pipe 33 through the channel section 23 on the connecting section 25 .

It is conceivable that the freezer compartment evaporator 30 is not made into a box shape, but a so-called wire tube evaporator with evaporator racks arranged at different height positions.

Claims (9)

1. An evaporator device, which has at least two evaporators with different refrigeration capacities installed in series before and after, supplied by a condenser through an injection point, wherein the evaporator with a lower refrigeration capacity is made into a plate shape, and The evaporator with higher refrigerating capacity is equipped with a pipeline for guiding refrigerant, and the evaporator with lower refrigerating capacity is connected in series in front, and it is characterized in that the plate evaporator (19) with lower refrigerating capacity has a The second plate section (26), which is equipped with injection points (32) for refrigerant, is thermally separated from the remaining first plate section (20) of the evaporator (19) with a lower refrigeration capacity. 2. The evaporator device according to claim 1, characterized in that the second plate section (26) has a refrigerant channel (27) connected to the injection point (32), which is useful on the outlet side at the connection point of the pipeline. 3. The evaporator device according to claim 2, characterized in that the refrigerant channel (27) is designed to have a minimum length on the second plate section (26). 4. The evaporator device according to any one of claims 1 to 3, characterized in that the second plate section (26) and the first plate section (20) of the evaporator (19) with a lower refrigeration capacity pass through at least one bridge A bridge-shaped connecting section (25), through which the outflow-side end of the refrigerant channel system (21) on the first plate section (20) is connected to the injection point (32). 5. The evaporator device according to claim 4, characterized in that, the bridge-shaped connecting section (25) is integrally connected with the second plate section (26), and is connected with the first plate section of the evaporator (19) with a lower refrigeration capacity. The segments (20) are integrally connected. 6. The evaporator device according to claim 1, characterized in that the first plate section (20) of the evaporator (19) with a lower refrigeration capacity is arranged inside the insulation layer of the refrigeration equipment and is thermally connected to the refrigeration unit. The inner liner of the refrigeration cavity in the equipment, while the second plate segment (26) is located outside the heat insulation layer. 7. The evaporator device according to claim 1, characterized in that the plate-shaped evaporator (19) is manufactured according to the roll-joint method or the Z-joint method. 8. The evaporator device according to claim 1, characterized in that the evaporator (11) with higher refrigeration capacity is designed in a box shape, with a tubular carrier tube (12) and a thermal contact wound on the carrier tube. line (14) on the tube. 9. The evaporator device according to any one of claims 1, 2 or 8, characterized in that, the outflow side of the pipeline (14) is connected to the The refrigerant channel system (21) of the first plate section (20) of the evaporator (19) is connected.

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