DE102019111829A1 - Control valve for regulating a coolant flow in a cooling system - Google Patents

Abstract

The invention relates to a control valve (26) for regulating a coolant flow in a cooling system (10), in particular in a cooling system (10) for cooling several heat sources (11, 12), with a valve housing (31) which has at least two inlet openings (32, 33) for supplying a first and a second coolant flow (36, 37), with a fluid space (29) which is in flow connection with the at least two inlet openings (32, 33), and with at least one outlet opening (34), which is connected by the fluid chamber (29), the at least two inlet openings (32, 33) each being assigned a valve (38, 39) which can be arranged at least in an open position (49) and a closed position (48), the positions of the valves (38, 39) can be set independently of one another for independent regulation of the coolant flows (36, 37) flowing through the inlet openings (32, 33)

Description

The invention relates to a control valve for regulating a coolant flow in a cooling system, in particular in a cooling system for cooling several heat sources.

From the DE 10 2014 009 772 A1 an electric vehicle is known which is driven by an electric drive machine. To increase the range, the electric vehicle also includes a fuel cell as a so-called "range extender". During operation, the electric drive machine and the fuel cell generate heat that is dissipated by a shared cooling system. After a cold start of the electric vehicle, the coolant initially only flows through the electric drive machine. This achieves rapid heating of the coolant and the drive machine. A thermostatic valve is provided between the drive machine and the fuel cell which, after reaching a defined coolant temperature, supplies at least a partial volume flow of the coolant to the fuel cell. To regulate the coolant temperature, the thermostatic valve can also supply a partial volume flow of the coolant to a radiator via a bypass. As a result of this cooling system, the electric drive machine and the fuel cell are thermally dependent, since the temperature of the coolant supplied to the fuel cell depends on the outlet temperature of the coolant from the drive machine.

The object of the present invention is to propose a control valve for regulating a coolant flow in a cooling system, which contributes to an optimized cooling of the components arranged in the cooling circuit.

This object is achieved according to the invention by a control valve according to the features of claim 1. Particularly preferred embodiments of the invention are specified in the dependent claims.

According to the invention it is provided that the control valve has at least two inlet openings, each of which is assigned a valve which can be arranged at least in an open position and in a closed position, and possibly in intermediate positions between the open position and the closed position, the position of the valves being independent from each other, for the independent regulation of the coolant flows flowing through the inlet openings, adjustable (controllable or regulatable).

By arranging the valves in the open and / or closed position and / or intermediate position, each valve can be completely closed or (completely) opened independently of one another. If one valve is arranged in the open position and the other valve in the closed position, only one of the two coolant flows flows through the open valve into the fluid space and leaves the control valve through the outlet opening. If both valves are arranged in the open position, both coolant flows flow through the valves and are combined to form a mixed coolant flow in the common fluid space. The fluid space then acts as a mixing chamber.

By arranging at least one of the valves in at least one intermediate position, the (partial) volume flows of the two coolant flows can be regulated independently of one another. In particular, coolant flows which have a different temperature are fed to the control valve via the inlet openings. Since the volume flows of the coolant flows can be regulated separately from one another, the mixing ratio between the two coolant flows can be changed. The coolant temperature of the mixed coolant flow can be adapted through the mixing ratio of the two coolant flows. As the individual (partial) volume flows of the two coolant flows can be adjusted, the volume flow of the mixed coolant flow can be set independently of its temperature. The temperature and / or the volume flow of the mixed coolant flow can thereby be adapted to a required coolant temperature and / or a required coolant volume flow for a heat source to be cooled.

In an advantageous development of the control valve, it can be provided that the valve has a valve seat and a movable valve element with a coolant passage is arranged in the valve seat and the coolant passage preferably forms a flow cross section that is equal to or larger than a flow cross section of the inlet opening. A control valve with three chambers is thus obtained, the chambers downstream of the inlet openings, formed by the coolant passages, being fluidically decoupled from one another. The fluid mechanical coupling takes place downstream in the fluid chamber as the third chamber. As a result, a valve can be formed which, with a good mixing effect, has a large flow cross section for the coolant flowing through. This results in a low flow resistance or pressure loss for the coolant flow through the valve.

In a development of the control valve, it can be provided that the valve element is designed as a cylindrical body and the valve seat has a cylindrical inner contour, the valve element being provided in the valve seat so that it can rotate about its longitudinal axis. By such a Design of the valve element, the smallest possible deflection of the coolant flow in the valve can be achieved. This can further reduce the pressure loss through the valve. In addition, the cylindrical shape makes it possible to achieve a small overall volume, so that the control valve can also be integrated within a heat source with a small footprint. The longitudinal axis is preferably oriented transversely to the main flow direction. The valve element can be adjusted radially in a space-saving and efficient manner by means of an electric actuator, for example a servomotor, arranged on its end face.

In a particularly preferred embodiment of the control valve it can be provided that the valve element is designed as a cylindrical hollow body, the coolant passage having two opposing, z. B. circular, fluid openings in the jacket of the hollow body and a cavity in the hollow body or is formed therefrom. By designing the valve element as a hollow body, a low weight of the valve element can be achieved. The execution of an actuating movement of the valve element is thereby made possible with a low actuating force. In addition, the cavity offers a large flow volume for the coolant flowing through the valve, which can result in a further reduction in the pressure loss.

An advantageous development of the control valve provides that an inner diameter D _{H of} the hollow body and / or the fluid openings is designed to be equal to or larger than the flow cross section D _{E of} the inlet opening and / or the supply lines to the control valve D _E. For example, the ratio D _H / D _{E can be} between 1 and 1.5, e.g. B. 1.2. With such a configuration, the largest possible flow volume for the coolant can be formed within the hollow body. This also results in the least possible influencing of the coolant flow with the aim of the lowest possible pressure loss.

It can preferably be provided that the valve elements are designed in the same way. As a result, the simplest possible structural design of the control valve can be achieved. In addition, the similar design of the valve elements simplifies a coordinated control of the two coolant flows.

In a development of the valve, it can be provided that at least one of the valve elements is arranged as a fit in the valve seat, but still rotatable. As a result, adequate sealing of the valve can be achieved without using a sealing element to seal the valve in the closed position and / or the two chambers or coolant passages.

In an alternative development of the valve it can be provided that a clearance fit is provided between at least one of the valve elements and the valve seat, so that in the closed position of the at least one valve element a residual flow of the coolant can flow through the valve. In the case of a valve seat designed as a cylindrical bore and a cylindrical valve element, a clearance fit of z. B. H11 / d9 (tolerance class combination) turned out to be suitable. Due to the residual flow of the coolant flowing through the valve, freezing of the valve and the downstream heat source at low temperatures in the closed position can be prevented, especially in aviation, with operation at high altitudes and thus low temperatures, but also during winter operation of a vehicle. At the same time, the residual flow can act as a lubricant.

The valve elements and / or the valve seats can preferably each be formed from the same material. The valve element and at least the valve seat are preferably formed from a light metal, plastic, composite material or similar material with a low intrinsic weight. As a light metal, aluminum (alloy), e.g. B. also with a coating, e.g. B. an anodized layer, but also other light metals such as magnesium (alloy) can be used. Due to the same material pairing, the valve element and at least the valve seat have the same coefficient of thermal expansion. In this way, the same or at least similar expansion properties result when the temperature changes, so that the valve element is prevented from jamming in the valve seat and, if there is a defined clearance fit for a residual flow, this is maintained.

In a particularly preferred embodiment of the control valve, the valve elements, in particular each, can be assigned an electric actuator, through which the actuating movement of the valve elements can be controlled independently of one another by an electric actuator, and a control system can preferably be provided that controls the actuator depending on a control parameter, in particular a temperature value and / or a volume flow value, controls. The actuator can, for. B. can be formed space-saving and efficient by a (servo) motor, which can be arranged on the end face of the valve element and can adjust the valve element radially. As a result, a thermally regulated and / or volume flow regulated control valve is available, which regulates the volume flow as a function of a parameter, in particular an external parameter. This external parameter can be, for example, an operating temperature, in particular an optimal operating temperature, of the heat source or a parameter of the coolant volume flow flowing through the heat source. In this way, the coolant temperature and / or the coolant volume flow of the coolant flow can be adapted to the optimal operating temperature of the heat source.

In a further development of the control valve it can be provided that the actuator can be controlled by the control in such a way that the valve element is between the open position and the closed position or an intermediate position in between, for regulating a continuous volume flow, or between the open position and the closed position , to generate a pulsating coolant flow, is adjustable. For pulsating regulation z. B. comparatively simply designed, inexpensive and / or robust valves can be used. The setting of the individual volume flows results from the temporal frequency of the pulsation. The fluid chamber as a “buffer volume” results in a continuous mixed coolant flow from the outlet opening.

In an advantageous development of the control valve, a filter element for filtering the coolant flowing out of the outlet opening can be present in the fluid space. B. extends into the fluid space, the filter element preferably made of a fluid-permeable material, e.g. B. made of sintered metal or a fine-mesh screen is formed. Such a filter element can ensure that the heat source connected downstream of the control valve is only supplied with a correspondingly filtered coolant flow. Because the filter element extends into the fluid space and is flowed through from the outside to the inside, an enlargement of the filter surface can be provided, which results in a lower pressure loss through the filter element. For this purpose, the filter element can be pot-shaped, conical, frustoconical, pyramidal or comparable.

A compact design is obtained if the valve housing is essentially cuboid (i.e. apart from attachments such as line connections and / or fastening points). For example, the valve housing can have a length of around 150 mm and a height and depth of less than half the length, e.g. B. have a height of 55 mm and a depth of around 60 mm. The valve element can, for. B. an outer diameter of around 40 mm, e.g. B. 38 mm, and have a height of around 50 mm. The dimensions also result in particular according to the application.

If the inlet openings and the outlet opening are arranged with respect to the fluid space in such a way that, during operation, the main flow direction of the coolant flowing into the fluid space is oriented at right angles to the main flow direction of the coolant flowing out of the fluid space, good mixing of the coolant flows with little pressure loss can be achieved with a compact design of the control valve can be achieved in the fluid space. This is especially the case when z. B. open the inlet openings on the same side in the fluid space and the flow cross-sections of the inlet openings at their mouths more than 50%, z. B. occupy 70% of the corresponding side surface of the fluid space. The mouth of the outlet opening preferably takes up more than 50% of another side surface of the fluid space, preferably oriented at right angles to the other side surface. The fluid space can, for. B. be at least substantially cuboid, which can offer manufacturing advantages in the formation of the sealing surfaces.

• 1 ein exemplarisches Schaltschema eines Kühlsystems zum Kühlen mehrerer Wärmequellen mit zwei erfindungsgemäßen Regelventilen,
• 2 eine schematische Schnittansicht eines der Regelventile gemäß 1,
• 3 eine perspektivische Detailansicht eines Ventilelements des Regelventils gemäß 2,
• 4 eine erste Schaltstellungen des Regelventils in einer stark schematisierten Darstellung,
• 5 eine zweite Schaltstellungen des Regelventils in einer stark schematisierten Darstellung und
• 6 eine dritte Schaltstellungen des Regelventils in einer stark schematisierten Darstellung.

The invention and further advantageous embodiments and developments thereof are described and explained in more detail below with reference to the examples shown in the figures. The features to be taken from the description and the drawings can be used individually or collectively in any combination according to the invention. Show it:

• 1 an exemplary circuit diagram of a cooling system for cooling several heat sources with two control valves according to the invention,
• 2 a schematic sectional view of one of the control valves according to FIG 1 ,
• 3 a perspective detailed view of a valve element of the control valve according to FIG 2 ,
• 4th a first switching position of the control valve in a highly schematic representation,
• 5 a second switching position of the control valve in a highly schematic representation and
• 6th a third switching position of the control valve in a highly schematic representation.

1 shows an example of a cooling system 10 , for cooling two heat sources 11 , 12 in a common cooling circuit 13 . This cooling system 10 enables the provision of different coolant temperatures and / or coolant volume flows, so that for the heat sources 11 , 12 an individual regulation of the cooling can be provided. In particular, the heat sources 11 , 12 can therefore be operated at different operating temperatures. By expanding the cooling system accordingly 10 can also do more than two heat sources 11 , 12 in the cooling circuit 13 are provided.

The heat sources 11 , 12 can be designed as thermal combustion engines, as fuel cells, as an electric motor or as power electronics requiring cooling. In particular, is in the cooling system 10 a combination of different heat sources 11 , 12 provided, for example a combination of a thermal combustion engine with a fuel cell or an electric motor. The cooling system 10 with the heat sources 11 , 12 can thereby be designed as a hybrid system. Such cooling systems with different heat sources 11 , 12 are increasingly used in aircraft, especially in aircraft. In an aircraft with such a cooling system, for example, thermal flow machines take over the function of the drive and an additional fuel cell takes over the electrical supply of the on-board systems when the aircraft is on the ground. But such hybrid systems with different heat sources are also increasingly being used in motor vehicles and / or ships 11 , 12 for use.

In aircraft, there is a continuous trend, both weight and cost, of cooling systems 10 to reduce. This can be done by reducing the number of components, with individual components of the cooling system 10 be shared. The reduction in the number of components also results in a reduction in the probability of failure, so that safety-related advantages are also achieved.

Through the common cooling circuit 13 are the heat sources 11 , 12 thermally connected to one another, but form separate mechanical and / or electrical systems. In the cooling circuit 13 a coolant circulates, which the two heat sources 11 , 12 flows through for cooling. To convey the coolant is downstream of the heat sources 11 , 12 a coolant pump 14th intended. The cooling circuit 13 is with an expansion tank 15th connected. This is used to compensate for changes in the volume of the coolant in the cooling circuit 13 as well as for storing coolant. To an overpressure in the cooling circuit 13 to avoid, instructs the cooling circuit 13 also a bypass line 23 with a pressure relief valve 24 on.

The coolant pump 14th stands with a cooling device 21st as well as with two control valves according to the invention 26th in connection. The cooling device 21st is through the connection with the coolant pump 14th at least part of the volume flow through the heat sources 11 , 12 heated coolant can be supplied. Through the cooling device 21st this is due to the heat sources 11 , 12 heated coolant is cooled, followed by a cold coolant flow 36 via a coolant supply 22nd the control valves 26th fed.

The control valves 26th are also available with the coolant pump 14th in flow connection, so that this next to the cold coolant flow 36 also at least part of the volume flow through the heat sources 11 , 12 heated warm coolant flow 37 is feedable. Each of the control valves 26th is each a heat source 11 , 12 assigned. Each of the control valves is 26th via a separate coolant guide path 18th , 19th with the respective control valve 26th assigned heat source 11 , 12 connected.

2 shows a schematic sectional view of one of the control valves 26th . The control valve 26th has a valve housing 31 with an essentially cuboid outer shape on which, on two side walls arranged at right angles to each other, two inlet openings 32 , 33 and an outlet port 34 are provided. The valve body 31 can have a cover with which the valve housing 31 can be locked. Via the first inlet opening 32 is for example the cold coolant flow 36 the control valve 26th can be fed in and through the second inlet opening 33 the warm coolant flow 37 . In the case 31 is a first valve 38 and a second valve 39 intended. The valves 38 , 39 are each one of the inlet openings 32 , 33 assigned. As in 2 shown, the inlet ports 32 , 33 each form a channel in each of which one of the valves 38 , 39 is arranged. Through the valves 38 , 39 can use the inlet openings 32 , 33 can be opened or closed independently of each other.

In the case 31 is an essentially cuboid fluid space 29 provided through the inlet openings 32 , 33 as well as the outlet opening 34 are in flow communication with each other. The fluid space 29 is downstream of the valves 38 , 39 arranged. In the fluid space 29 become the cold and warm coolant flow 36 , 37 , for a compact design of a side wall in the fluid space 29 flowing in, merged. This results in a mixing of the coolant flows 36 , 37 to a mixed coolant flow 40 . This mixed coolant flow 40 can from the fluid space 29 through the outlet opening 34 step out. For a good mixing effect with a compact design, the outlet opening is arranged in particular on a side wall of the fluid space which is arranged at right angles to the other side wall.

The valves 38 , 39 are for example each by a cylindrical valve seat 41 as well as one in the valve seat 41 arranged, for example cylindrical valve element 42 educated. In the valves 38 , 39 can sensor elements such. B. for flow and / or temperature measurement, be available (not shown here). The valve seat 41 is in the case 31 for example designed as a cylindrical bore. In particular, the valve seat 41 an, for example, cylindrical inner contour. The following statements are limited to the cylindrical design of the valves 38 , 39 , however, the valve elements 42 also be designed as spherical valve elements which are arranged in a spherical valve seat or have any other design.

A perspective detailed view of the cylindrical valve element 42 is in 3 shown. The valve element 42 is as a cylindrical hollow body 43 educated. The hollow body 43 can for example be a sleeve. The end faces of the hollow body 43 can be open or closed. Inside the hollow body 43 is a cavity 44 educated. In the jacket of the cylindrical hollow body 43 are two fluid ports 46 , 47 intended. These fluid openings 46 , 47 are in particular opposite in the jacket of the hollow body 43 brought in. The fluid openings 46 , 47 be arranged at an angle to one another and / or at different heights. Through the fluid openings 46 , 47 and the cavity 44 is a coolant passage 28 formed for the coolant. The flow cross section D _{F of} the fluid openings 46 , 47 is preferably the same size or larger than the flow cross-section D _{E of} the inlet openings 32 , 33 and / or the supply lines to the control valve. The inside diameter D _{H of} the cavity 44 is preferably made larger than the flow cross-section D _{E of} the inlet openings 32 , 33 and / or the supply lines to the control valve.

The valve element 42 is in the valve seat 41 rotatably mounted about its longitudinal axis L. To reduce the friction during the rotary movement, a bearing is preferably provided at a suitable point (not shown here), which z. B. can comprise a sliding washer or can be formed by a needle bearing. The bearing can in particular on an end cap of the valve element 42 be provided, the jacket of the cylindrical hollow body during operation 43 is pressed against the cap.

Due to the rotatable mounting of the valve element 42 are a closed position 48 and an open position 49 of the valve element 42 by rotating the valve element 42 ingestible. In the open position 49 are the fluid ports 46 , 47 and the entrance opening 32 , 33 arranged at least substantially congruently to one another. This allows the coolant to pass through the coolant 28 stream. In the open position 49 is the largest flow cross-section of the valve 38 , 39 educated. This corresponds z. B. the flow cross section D _{E of} the inlet openings 32 , 33 and / or the flow cross section D _{F of} the fluid openings 46 , 47 . By the adjusting movement of the valve element 42 the fluid openings move 46 , 47 of the valve element 42 to the entrance opening 32 , 33 , whereby the flow area of the valve 38 , 39 is gradually reduced. This results in a reduction in the volume flow that passes through the valve 38 , 39 flows.

The rotary movement of the valve elements 42 is controlled by an electric actuator not shown in detail. This actuator includes an actuator that works with the valve elements 42 is connected and an independent control of the valve elements 42 enables. The actuator is, for example, a servomotor that is attached to each of the valve elements 42 is arranged on the front and causes a radial adjustment movement. The actuator is in particular through a control 25th controlled. The regulation 25th controls the actuator depending on a control parameter. This control parameter is in particular a recorded temperature value and / or a volume flow in the cooling circuit 13 . In particular, the control parameter is an operating temperature of the respective control valve 26th assigned heat source 11 , 12 , an inlet or outlet temperature of the coolant of this heat source 11 , 12 and / or an optimal operating temperature or an optimal operating temperature range of this heat source 11 , 12 or a coolant flow rate value of the heat source 11 , 12 flowing through coolant.

The valve elements 42 and at least the valve seat 41 and / or the housing 31 are made of the same material. As a result, the valve elements 42 and the valve seat 41 the same thermal expansion coefficient. The valve elements 42 and at least the valve seat 41 and / or the housing 31 are preferably made of a light metal, for example aluminum or magnesium alloy. The valve elements 42 and at least the valve seat 41 and / or the housing 31 be formed from a plastic or from a composite material or the like. In the event of temperature fluctuations, the same material pairing prevents the valve element 42 in the valve seat 41 uptight. The two valve elements 42 are designed in particular in the same way.

The valve elements 42 can be a perfect fit or with a clearance fit in the valve seat 41 be arranged. In both embodiments there is no seal between the valve element 42 and the valve seat 41 required. Is the valve element 42 with a clearance fit in the valve seat 41 provided, can also in the closed position of the valve element 42 a small residual flow of coolant through the valve 38 , 39 stream. This can cause the valve to freeze 38 , 39 and prevent downstream heat sources at low temperatures.

In the fluid space 29 is a filter element 30th intended for filtering the coolant. The filter element 30th is at the outlet port 34 of the fluid space 29 arranged. The filter element 30th is, for example, cup-shaped and extends into the fluid space 29 . This creates a large filter area that reduces the pressure loss through the filter element 30th reduced. The filter element 30th can also have any other geometry. The filter element 30th is formed in particular from a sintered metal.

The 4th to 6th show examples of different switching positions of the control valve 26th in a highly schematic representation.

In the first switch position according to 4th is the valve element 42 of the first valve 38 in the open position 49 arranged and the valve element 42 of the second valve 39 in the closed position 48 arranged. In the open position 49 is the first valve 38 fully open so that the cold coolant flow 36 completely through the inlet port 32 into the fluid space 29 flows. The second valve 39 is in the closed position 48 completely closed so that the warm coolant flow 37 not through the inlet opening 33 flows. Is the valve element 42 with a clearance fit in the valve seat 41 arranged, flows in the closed position 48 nevertheless a small residual flow of coolant through the second valve 39 . The mixed coolant flow is thus in this switching position 40 through the cold coolant flow 36 educated.

5 shows a second switching position of the control valve 26th . The valve element is in this second switching position 42 of the first valve 38 in the closed position 48 arranged and the valve element 42 of the second valve 39 in the open position 49 . This is the first valve 38 for the cold coolant flow 36 fully closed, the second valve 39 on the other hand for the warm coolant flow 37 fully open. The mixed coolant flow is thus in this switching position 40 through the warm coolant flow 37 educated.

6th shows an example of a third switching position of the control valve 26th in which the valve elements 42 of the valves 38 , 39 each in an intermediate position 51 are arranged. This intermediate position 51 can be any angular position of the valve element 42 between the closed position 48 and the open position 49 his. In this way there is a stepless adjustment of the valve element 42 possible. By changing the angular position of the valve element 42 becomes a decrease or increase in the flow area of the coolant passage 28 achieved, so that a precise volume flow control of the coolant flows 36 , 37 is made possible.

The valve elements 42 can have different intermediate positions independently of each other 51 take in. This is the volume flow of the warm coolant flow 37 and the cold coolant flow 36 independently adjustable. By regulating the volume flows, there is a mixing ratio between the warm coolant flow 37 and the cold coolant flow 36 changeable. By changing the mixing ratio between the warm coolant flow 37 and the cold coolant flow 36 can be a mixed coolant flow 40 are generated with a coolant temperature that is between the coolant temperature of the cold and warm coolant flow 36 , 37 lies. Through the control valve 26th can be the coolant temperature and the volume flow of the coolant mixed flow 40 can be controlled simultaneously and / or independently of one another.

For example, the valve elements 38 , 39 adjusted synchronously to each other, for example both valve elements 42 open or closed in the same ratio, the volume flow of the mixed coolant flow changes 40 , however, the temperature of the mixed coolant flow remains 40 constant because the mixing ratio between the cold and warm coolant flow 36 , 37 through the synchronous adjustment of the valve elements 42 is not changed. On the other hand, a coordinated asynchronous adjustment of the valve elements 42 , for example, a valve element 42 opened and the other valve element 42 closed in the same ratio, the coolant temperature of the coolant mixed flow 40 due to the changed mixing ratio between the warm and cold coolant flow 36 , 37 be increased or decreased, the volume flow of the mixed coolant flow 40 due to the coordinated adjustment of the valve elements 42 remains constant. In addition, a corresponding asynchronous adjustment of the valve elements 42 the coolant temperature of the mixed coolant stream 40 be increased or decreased and at the same time the volume flow of the mixed coolant flow 40 be increased or decreased.

By the control valve according to the invention 26th A mixing device is made available which, through the separate controllability of the cold and warm coolant flow, leads to an optimized cooling of the coolant arranged in the cooling circuit Components contributes. Due to the design that is optimized in terms of installation space and weight, the control valve can be used particularly advantageously in aviation.

QUOTES INCLUDED IN THE DESCRIPTION

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Patent literature cited

• DE 102014009772 A1 [0002]

Claims (14)

Control valve (26) for regulating a coolant flow in a cooling system (10), in particular in a cooling system (10) for cooling several heat sources (11, 12), with a valve housing (31) that has at least two inlet openings (32, 33) for supply a first and a second coolant flow (36, 37), with a fluid space (29) which is in flow connection with the at least two inlet openings (32, 33), and with at least one outlet opening (34) which is connected to the fluid space (29 ), characterized in that the at least two inlet openings (32, 33) are each assigned a valve (38, 39) which can be arranged at least in an open position (49) and a closed position (48), the positions of the valves ( 38, 39) can be set independently of one another for the independent regulation of the coolant flows (36, 37) flowing through the inlet openings (32, 33). Control valve according to Claim 1 , characterized in that the valve (38, 39) has a valve seat (41) and a movable valve element (42) with a coolant passage (28) is arranged in the valve seat (41) and preferably the coolant passage (28) has a flow cross-section (D _F ) which is the same size or greater than a flow cross section (D _E ) of the inlet opening (32, 33). Control valve according to Claim 2 , characterized in that the valve element (42) is designed as a cylindrical body and the valve seat (41) has a cylindrical inner contour, the valve element (42) being arranged in the valve seat (41) so as to be rotatable about its longitudinal axis (L). Control valve according to Claim 2 or 3 , characterized in that the valve element (42) is designed as a cylindrical hollow body (43), wherein the coolant passage (28) (43) has two opposing, z. B. circular, fluid openings (46, 47) in the jacket of the hollow body (43) and a cavity (44) in the hollow body (43). Control valve according to Claim 4 , characterized in that an inner diameter (D _H , D _F ) of the hollow body (43) and / or the fluid openings (46, 47) is designed to be equal to or larger than the flow cross section (D _E ) of the inlet opening (32, 33). Control valve according to one of the Claims 2 to 5 , characterized in that the valve elements (42) are designed in the same way. Control valve according to one of the Claims 2 to 6th , characterized in that at least one of the valve elements (42) is arranged precisely in the valve seat (41). Control valve according to one of the Claims 2 to 6th , characterized in that a clearance fit is provided between at least one of the valve elements (42) and the valve seat (41) so that in the closed position (48) of the at least one valve element (42) a residual flow of the coolant through the valve (38, 39) , in particular between the valve element (42) and the valve seat (41), can flow. Control valve according to one of the Claims 2 to 8th , characterized in that the valve elements (42) and / or the valve seats (41) are each formed from the same material, preferably from a light metal, plastic, composite material or the like. Control valve according to one of the Claims 2 to 9 , characterized in that an electric actuator is assigned to the valve elements (42), in particular each, by means of which an actuating movement of the valve elements (42) can be controlled independently of one another and preferably a control (25) is provided which controls the actuator as a function of a Control parameters, in particular a temperature value and / or a volume flow value, controls. Control valve according to Claim 10 , characterized in that the actuator can be controlled by the control (25) in such a way that the valve element (42) is adjustable between the open position and the closed position or an intermediate position in between or between the open position and the closed position. Control valve according to one of the preceding claims, characterized in that a filter element (30) for filtering the coolant flowing out of the outlet opening (34) is present in the fluid space (29), which is e.g. B. extends into the fluid space (29), wherein the filter element (29) is preferably made of a fluid-permeable material, e.g. B. made of sintered metal or a fine-mesh screen is formed. Control valve according to one of the preceding claims, characterized in that the valve housing (31) is essentially cuboid. Control valve according to one of the preceding claims, characterized in that the inlet openings (32, 33) and the outlet opening (34) are arranged in such a manner with respect to the fluid space (29) are that, during operation, the main flow direction of the coolant flowing into the fluid space (29) is aligned perpendicular to the main flow direction of the coolant flowing out of the fluid space (29).

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