JPS5956698A - Heat exchanging device and heat exchanger for such device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for combining a liquid heat carrier and a gas in which the amount of heat to be transferred can be determined by controlling the flow rate of the liquid heat carrier through a heat exchanger consisting of a number of parallel flow branches. The present invention relates to a device for exchanging heat between heat mediums, and a heat exchanger for the device. Such a device is covered by West German Patent No. 7106.
It is known from the specification No. 02. The device is used in motor vehicles to heat the air stream introduced into the interior of the vehicle.

The heat exchanger of the device is then flowed through by the cooling water of the motor vehicle engine. The heating capacity is controlled by throttling the amount of heated water flowing through the device by means of the slide valve piston present. If only a small heating capacity is required (e.g. during the change of seasons) and the heating water stream is strongly throttled by a phase novation, the heating capacity imparted by the device to the air stream will depend on the rotational speed of the device's pump. was shown to be significantly influenced by However, since the pump rotation speed is directly determined by the rotation speed of the automobile engine that drives the pump, the supply of heating capacity is highly unstable within this heating capacity range due to fluctuations, for example, engine rotation speed determined by road traffic. I can recognize that. This requires frequent adjustments by the driver of the vehicle, for example. It is obvious that this operation is extremely troublesome for people who drive cars. In extreme cases, the driver's attention may be diverted from driving on the road, leading to an accident.

In contrast, the heat exchange device according to the invention provides that in a device of the type mentioned at the outset, the flow branches of the heat exchanger for the liquid heat medium can be switched independently and in an almost pure switching operation. Features. The device provides a Ni! I
It has the advantage of being controlled. The open flow branch is then saturated. The branch is therefore flowed through by an unrestrained heat medium flow, so that the dependence of the heating capacity on the rotational speed of the pump of the device is reduced by 1r42 to an insignificant fluctuation.

An advantageous embodiment of the heat exchanger according to the invention consists in that each flow branch can be opened and closed in sequence.

In the heat exchanger for a heat exchange device according to the present invention, the heat exchanger has a storage tank at least on its supply side, a pipe forming a flow branch path branches from the storage tank, and the pipe is a dust pipe. It is characterized in that it supports fins that are washed by a heat medium flow.

An advantageous embodiment of the heat exchanger according to the invention provides that the storage tank is designed as a control housing, in which a rotary sleeve valve is arranged, the control edge of which is designed to close off the flow branch. the control edge intersects at an angle with the generatrix of the cylindrical surface of the rotating sleeve valve; the rim extends parallel to the generatrix of the cylindrical surface of the rotating sleeve valve; and has a controlled variable ]-1, and the internuclear [-] has a control edge extending parallel to the generatrix of the cylindrical surface of the rotary sleeve valve and a control edge extending at an angle; It consists of controlling the opening and closing of the flow ports of tubes arranged in rows, the axes of which extend perpendicularly to the axis of the rotary sleeve valve.

The invention will be explained in more detail with reference to the accompanying drawings, which illustrate embodiments of the device according to the invention. FIG. 1 shows a heat exchanger according to the invention with integrated rotating sleeve valve control, and FIG.
3 is a developed view of the rotary sleeve valve, and FIG. 4 is a diagram showing the relationship between the flow rate of the liquid heat medium and the amount of heat released.

The device shown in the accompanying drawing for exchanging heat between a liquid heat medium and a gaseous heat medium is used as a heater in a motor vehicle. The device has a heat exchanger 1 which has eight pairs of tubes 2, for example made of copper, through which a cooling water stream 3 of a motor vehicle engine flows. Two tubes in each case are horizontally juxtaposed. The eight pairs of tubes also overlap each other vertically. Fins 4, which are designed, for example, as corrugated plates in a known manner, are arranged perpendicularly to the axes of the tubes 2 on these tubes 2 in a thermally connected manner. The fins are flowed through by an air stream 5 which is directed into the lj of the motor vehicle.

The ends of the tube 2 open into a storage tank 6.7 on its inlet and outlet sides, respectively. The storage tank has a cylindrical interior, the axis of which extends perpendicularly to the axis of the tube 2. A feed line 8, shown only schematically, opens into the interior of the storage tank 7 on the supply side, and an outlet line 9, also shown schematically, opens into the interior of the storage tank 6 on the outlet side. . Of course, the storage tank on the outflow side (as is known per se)
It may also be designed as a rectangular casing. Via the supply line 8 and the outlet pipe 9, the device constructed according to the invention is inserted in a known manner and manner into the heated water circulation of the motor vehicle engine.

The storage tank 7 on the supply side is also designed as a control housing, in which a rotary sleeve valve 10 is arranged. The rotary sleeve valve 10 is closed at its end face by a cover 11, which can be switched over! -12 is supported. Switch and connect Bowden wire 13 to the end of A-12.
are connected to each other and can be used to rotate the rotary sleeve valve 10. The other end of the Bowden wire 13 is connected to a switching switch located, for example, in the dash of a motor vehicle.

The rotating sleeve valve shown in the exploded view in Figure 3 is the control 0111
It has a nozzle d1114, the control edge 15.16 of which closes the flow opening of the tube 2 forming the flow branch when the rotary sleeve valve 10 rotates, thereby switching the tube open or closed. As can be seen in FIG. 3, the control edge 16 intersects the generatrix of the cylindrical surface of the rotary sleeve valve 10 at an angle α;
This angle is approximately 20° in the figure. In contrast, the control edge 15 extends parallel to the generatrix of the cylindrical surface of the rotary sleeve valve 10.

In FIG. 1, the rotary sleeve valve 10 is in a position in which all flow branches ('tJ' 2 ) are open. When the rotary sleeve valve 10 is rotated clockwise from the position shown in FIG. 1 in which all tubes 2 are open, the tubes 2 are closed by the control lip 16 successively from the lower left as seen in FIG. . For example, if 3 pipes are closed, the other 13 pipes are still in the completely open position, in which position the pump 170 rpm is present in the heating cycle, usually determined by the engine speed in a car. Dependence on numbers is hardly discernible.

FIG. 4 shows the relationship between the flow rate of the liquid heat medium on the coordinate X axis and the released heat M within a time unit on the Y axis with respect to the flow branch path (pipe 2) of the heat exchanger. The characteristic curve obtained rises steeply in the case of low liquid metering and then bends to take on a more horizontal course. In this device, the four-tube 2 is therefore operated within the more horizontal range X (saturation) of the characteristic curve.

The possible fluctuation y of the amount of heat transferred within the saturation range is extremely small. The flow in the tube here proceeds turbulently, so that an intensive heat exchange can take place between the tube wall and the fins 4, which are washed by the gaseous heating medium (here the air flow 5 led into the passenger compartment). .

The critical operating state of the device is when only one or two tubes 2 are in the open range, ie with a very small heating capacity (]716~2/16...maximum heating capacity). When the first tube 2 is opened, it is possible that only half of this tube 2 is opened by the rotary sleeve valve 10. In this case, the tube 2 is not completely flowed through, so that the tube is not saturated.

However, this is not a realistic operating condition. This is because such a small heating capacity causes almost no appreciable change in the temperature inside the vehicle.

As the number of tubes 2 that are opened increases, the ratio of the four tubes 2 that are not working at saturation to the proportion of tubes 2 that are already open becomes less and less important.

Of course, the device according to the invention used here as a passenger compartment in a motor vehicle can also be used elsewhere. It is of course also possible for the liquid heat transfer medium to be formed by cooling brine, in which case the heat exchange medium is used to cool the gaseous heat transfer medium flowing through it.

Another advantage of the present invention is that a laminar air flow (co-current flow of cold air and moist air) can be created. if;
The configuration of the IJ cylinder control rim allows each air nozzle of the heated casing to be loaded with air at a constant temperature. Therefore, the tube 2 of the heat exchanger 1, which is close to the outflow nozzle to the footwell space, can be opened first in order to bring the desired and comfortable temperature inside the vehicle closer to the head area, with the head cool and the footwell loose. .

[Brief explanation of drawings]

FIG. 1 shows a heat exchanger according to the invention with integrated rotating sleeve valve control, and FIG.
This is a diagram taken along line I-II, and Figure 3 is an expanded view of the rotary sleeve valve (bl) 4, and Figure 4 is a diagram showing the relationship between the flow rate of the liquid heat medium and the amount of heat released. . 1... Heat exchanger, 2... Flow branch path, 3... Heat medium, 4... Heat medium, 7... Storage tank, 10... Rotating sleeve valve, 14・Control amount ['', 15
．． 16...Control edge FIG, 2 FIG 4

Claims (1)

[Scope of Claims] 1. A device for exchanging heat between a liquid heat medium and a gaseous heat medium, in which the amount of heat to be transferred is passed through a heat exchanger consisting of a large number of flow branches extending in parallel. In a heat exchange device of the type that can be determined by controlling the flow rate of the liquid heat medium, the flow branches (2) of the heat exchanger for the liquid heat medium (3) are independently and in substantially pure opening and closing operation. A heat exchange device characterized in that it is switchable. 2. The device according to claim 1, wherein each flow branch path (2) can be controlled to open and close sequentially. 3 A device for exchanging heat between a liquid heat medium and a gaseous heat medium, in which the amount of heat to be transferred is transferred by controlling the flow rate of the liquid heat medium passing through a heat exchanger consisting of a large number of flow branches extending in parallel. In a heat exchanger for a heat exchanger of the type in which the flow branches of the heat exchanger for the liquid heat medium are capable of switching independently and with almost pure switching operation, the The heat exchanger (1) has a storage tank (7) at least on its supply side, from which a pipe (2) forming a flow branch branches off, the pipe (2) having a Heat exchanger for a heat exchange device, characterized in that it supports fins (4) which are washed by a gaseous heat medium stream (5). 4. A storage tank (7) is constructed as a control casing, in which a rotary sleeve valve (10) is arranged.
5 control edges (15, 16) of the heat exchanger according to claim 3, wherein the control edges (15, 16) are configured to close or open the flow branch (2). 5. Heat exchanger according to claim 4, in which the line (16) intersects the generatrix of the cylindrical surface of the rotary sleeve valve (1o) at an angle. 6. Heat exchanger according to claim 4, wherein the control edge (15) extends parallel to the generatrix of the cylindrical surface of the rotary sleeve valve (1o). 7. The rotating sleeve valve (10) has a control opening ('14), which opening (I4) forms an angle with a control edge (]5) extending parallel to the generatrix of the cylindrical surface of the rotating sleeve valve (]0). It has a control edge (]6) extending as shown in FIG.
6) are arranged in two rows, the axis of which is the rotary sleeve valve (1
Heat exchanger according to claim 93, 4 or 6, characterized in that the flow openings of the tubes (2) extend perpendicularly to the axis of the tubes (2).