JP2005090828A - Oscillating flow generator and heat exchanger using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration flow generator capable of generating a vibration flow in a small size with certainty.
SOLUTION: A flow direction switching valve 3 disposed in a flow path 2 and a pump 4 for giving energy for reciprocating a liquid in the flow path are provided, and the flow direction switching valve 3 is provided in the valve. The formed in-valve channel 31, the first inflow / outlet port 32 a through which the reciprocating flow flows in and out through the channel, the inflow port for the discharge liquid generated from the pump and the discharge port to the pump 32b, a communication passage that communicates the in-valve channel 31 with the inlet from the pump and the first inflow / outlet of the reciprocating flow, the discharge port to the pump, and the second inflow / outlet of the reciprocating flow A communication passage that communicates the first state divided into a communication passage that communicates with the pump, an inlet from the pump and a second inflow / discharge port of the reciprocating flow, and a discharge passage to the pump and the first of the reciprocating flow. It is switched alternately to a second state partitioned into a communication passage communicating with one inflow / discharge port.
[Selection] Figure 1

Description

  The present invention relates to an oscillating flow generator for reciprocating a liquid in a flow path and a heat exchanger for transporting heat from one end of the heat transfer tube to the other end by reciprocating the liquid inside the heat transfer tube using the apparatus.

  As heat transfer means for cooling or heating in various devices such as industrial and household use, a latent heat utilization type heat transfer element and a liquid reciprocating flow type heat transfer element are known.

  The latent heat utilization type heat transfer element is generally called “heat pipe” and has already been put into practical use in many fields. The heat pipe is a heat transfer element equipped with a wick that promotes an appropriate amount of hydraulic fluid and its circulating flow in a decompressed pipe. The heat transfer principle uses the latent heat of the heat medium, the working fluid that is the heat medium is heated and evaporated at the heat receiving part at one end of the heat pipe, moves to the heat radiating part at the other end due to the pressure difference, There it is cooled and condensed. The condensed hydraulic fluid moves to the heat receiving part and is heated using gravity or capillary action. Then, by repeating this cycle, heat is transferred from one end to the other end through the latent heat of the working fluid. The heat pipe does not require a mechanical driving unit and has a simple structure, but has an advantage in that the operating temperature is limited by the evaporation temperature and the condensation temperature of the working fluid.

  On the other hand, a liquid reciprocating flow type heat transfer element is a heat transfer element that transports heat from one end of the heat transfer tube to the other end by reciprocating a liquid as a heat medium inside the heat transfer tube. The principle of heat transfer by reciprocating flow is based on a unique form of reciprocating flow of liquid in the tube. That is, the main flow occurs only in the central portion of the tube, and the boundary layer portion close to the inner wall of the tube remains almost stationary. In the reciprocating flow cycle of one time, first, in the forward path stage, the heat transferred to the liquid at one end of the pipe penetrates to a certain position inside the pipe with the liquid flow, and is transferred to the stationary boundary layer at that position. Is done. In the next return phase, low temperature liquid enters the position from the other end of the tube and receives heat from the stationary boundary layer. When the next reciprocating flow cycle is started, the low-temperature liquid that has received the heat flows to the other end side of the pipe in the forward path stage. By repeating this cycle, heat is transferred from one end of the tube to the other end.

  This liquid reciprocating flow type heat transfer element does not need to depressurize the inside of the pipe and does not require a wick for promoting reflux, compared to a latent heat utilization type heat transfer element (heat pipe), so that the structure of the pipe can be further simplified. In addition, the operating temperature is not limited to the liquid evaporation temperature and the condensation temperature, and the heat transfer amount is large and the heat conduction efficiency is high. An example of such a liquid reciprocating flow type heat transfer element is disclosed in Patent Document 1 shown below.

JP 2002-364991 A

  However, in the liquid reciprocating flow type heat transfer element described above, it is practically disadvantageous in terms of structure and cost to require a mechanical driving unit for causing reciprocating flow. In particular, as disclosed in Patent Document 1, when the heat transfer tube is formed of a meandering narrow tube, the vibration mechanism for reciprocating the liquid enclosed in the narrow tube is extremely It is necessary to extrude the liquid with high pressure. However, only the use of a vibrator as the vibration mechanism used in Patent Document 1 is described, and the specific mechanism is not disclosed. For this reason, the development of a mechanism that generates an oscillating flow enough to realize high heat conduction has been a challenge for making this principle usable as an effective heat transfer element.

  In other words, while using a vibration mechanism that can extrude liquid at a high water pressure and enables a long stroke, efficient heat transfer can be realized, the vibration mechanism that realizes such an oscillating flow is The structure becomes very large, and the size of the apparatus itself cannot be reduced. Therefore, there arises a problem that it is difficult to mount the small electronic device for cooling.

  The present invention provides an oscillating flow generator that is an extremely simple structure and that is compact and capable of reliably generating an oscillating flow, and that is optimal as a driving means for a liquid reciprocating flow type heat transfer element, and a liquid using the same It is an object of the present invention to provide a heat exchanger as a reciprocating flow type element.

  In order to achieve the above object, the present invention adopts the following configuration.

  First, an oscillating flow generator for reciprocating a liquid in a flow path, comprising: a flow direction switching valve disposed in the flow path; and a pump for providing energy for reciprocating the liquid in the flow path. ing. The flow direction switching valve is generated by an in-valve flow path formed in the valve, a first inflow discharge port and a second inflow discharge port through which the reciprocating flow flows in and out, and a pump. A discharge fluid inlet and a discharge outlet to the pump, and further, a flow path in the valve, a communication passage communicating the inlet from the pump and the first inflow discharge outlet of the reciprocating flow, and the pump The first state partitioned into a communication passage that communicates the discharge port of the reciprocating flow and the second inflow discharge port of the reciprocating flow, and the communication passage that communicates the inlet from the pump and the second inflow discharge port of the reciprocating flow And a communication path that connects the discharge port to the pump and the first inflow / discharge port of the reciprocating flow, and a second state that is partitioned into a second state. .

  At this time, the first inflow / discharge port and the second inflow / discharge port communicating with the flow path are respectively disposed in the opposite portion of the valve flow path, and the first inflow / discharge port and the second flow path in the valve flow path are arranged. It is desirable to have a configuration in which an inlet port from the pump and a discharge port to the pump are respectively arranged in a portion facing the inflow / discharge port.

  In addition, the flow direction switching valve includes a partition member that alternately switches and partitions between the first state and the second state in which the intra-valve flow path is divided into each communication path, and the partition member is divided into the first state and the second state. It is desirable to have a movable means that can be moved so as to achieve the above state.

  And the said movable means is comprised by the rotational drive means which rotates a partition member, and the structure which switches a valve flow path to a said 1st state and a 2nd state alternately by rotating a partition member It is still desirable.

  Further, the vibration flow generator is connected to both ends of the heat transfer tube, and a heat exchanger configured to reciprocate the liquid inside the heat transfer tube to transfer heat from the heat absorption portion of the heat transfer tube to the heat dissipation portion is configured. May be. At this time, it is desirable to form the heat transfer tube in a serpentine channel.

  With the above configuration, first, when the flow path in the valve is in the first state, the discharge liquid from the pump that discharges the liquid in a certain direction flows into the flow path in the valve from the inlet, The inflowing liquid flows into the first inflow / discharge port to the flow path communicating in the valve flow path. Accordingly, in the flow path, the liquid flows from the first inflow / discharge port toward the second inflow / discharge port, and the liquid is discharged from the second inflow / discharge port to the intra-valve flow path. At this time, the discharge liquid surely flows into the flow path from the first inflow / discharge port due to the discharge pressure from the pump, so that the flow in the flow path is reliably realized. At the same time, the liquid discharged from the second inflow / discharge port to the in-valve flow channel flows into the discharge port that communicates with the second inflow / discharge port through the pump that communicates with the in-valve flow channel. The liquid that has flowed into the discharge port flows into the pump, and again flows into the valve flow path from the inflow port.

  Subsequently, when the flow direction switching valve is switched to the second state, the discharge liquid from the pump flows into the valve flow path from the inlet, and this flowed liquid is now in the valve flow path. It flows into the 2nd inflow discharge port which is connected. Accordingly, in the flow channel, the liquid flows from the second inflow / discharge port toward the first inflow / discharge port, and the liquid is discharged from the first inflow / discharge port to the intra-valve flow channel. That is, it flows in the direction opposite to that in the first state described above. At this time, as described above, the flow of the flow path is reliably realized by the discharge pressure from the pump. At the same time, the liquid discharged from the first inflow / discharge port to the in-valve flow channel flows into the discharge port communicating with the first inflow / discharge port connected to the pump connected through the in-valve flow channel. The liquid that has flowed into the discharge port flows into the pump, and again flows into the valve flow path from the inflow port.

  Then, by operating so as to alternately switch between the first state and the second state, the flow direction of the liquid in the flow path is alternately changed, and the liquid reciprocates and the vibration flow is generated. It can be generated reliably.

  At this time, the first and second inflow / outlet ports are respectively disposed at predetermined facing portions of the flow direction switching valve, and the inflow portion and the discharge port are disposed at the facing portions between them, thereby allowing the flow direction to flow. Each inflow / discharge port leading to the path and the inflow port / discharge port leading to the pump are alternately arranged. Therefore, since the liquid inlets and outlets that communicate with each other in the first and second states to form the respective communication paths are arranged adjacent to each other, it is easy to partition the inside of the valve flow path as described above. . In addition, since the liquid inlets and outlets are arranged at substantially equal intervals, switching between the first state and the second state can be easily performed. As a result, the configuration of the vibration direction switching valve itself can be simplified, and the apparatus can be downsized.

  Moreover, the structure which switches the flow in an in-valve channel is divided and the partition member which divides the said in-valve channel into each communicating path, and a partition member is moved alternately so that it may be in the 1st, 2nd state mentioned above. The apparatus can be realized with a simple configuration using movable means, and a normal pump that simply discharges liquid in one direction can be used. Therefore, the apparatus can be reduced in size. In particular, by switching the flow state of the connecting portion by rotating the partition member, it can be formed with a simpler configuration, and the switching speed of the vibration flow can be increased. At the same time, the switching speed can be easily controlled by controlling the rotational speed of the movable means, and the frequency control of the vibration flow can be easily performed.

  And it can utilize as a liquid reciprocating flow type heat transfer element by connecting and providing the said oscillating flow generator to the both ends of a heat exchanger tube. In such a case, a relatively strong discharge force can be generated by the action of the pump, and an oscillating flow can be effectively flowed into the serpentine channel forming the narrow tube. An element can be realized. Further, as described above, the frequency and flow rate of the oscillating flow can be controlled, and the amount of heat transported can be easily controlled.

  First, the features of the present invention will be outlined. The oscillating flow generator of the present invention is provided with a flow direction switching valve in a flow path that generates a oscillating flow, and the flow direction of the liquid in the flow path is switched every time this valve is switched.

  As a configuration, a first inflow discharge port and a second inflow discharge port through which a reciprocating flow flows into and out of the flow path in the valve formed in the flow direction switching valve, and a pump disposed outside And a discharge port to the pump and a discharge port to the pump. And while letting the discharge liquid from a pump flow alternately into the 1st inflow discharge port and 2nd inflow discharge port which are connected to a flow path, the liquid discharged from the 1st inflow discharge port and the 2nd inflow discharge port respectively It is alternately discharged to the discharge port to the pump.

  For this reason, it is divided into a communication path that connects the inlet from the pump and the first inflow / discharge port of the reciprocating flow, and a communication path that connects the discharge port to the pump and the second inflow / outlet of the reciprocating flow. A communication path that connects the inlet from the pump and the second inflow / discharge port for reciprocating flow, and a communication path that connects the discharge port to the pump and the first inflow / discharge port for reciprocating flow. , And the second state divided into two, are alternately switched to the flow path in the valve and partitioned.

  As a result, the flow direction of the liquid in the flow path is alternately changed, and the liquid reciprocates to generate an oscillating flow with certainty.

  Hereinafter, a specific configuration of the oscillating flow generator according to the present invention will be described in detail in Embodiment 1. Further, a heat exchanger as a liquid reciprocating flow type heat transfer element using the oscillating flow generator will be described in detail in Example 2, and an application example thereof will be described in Example 3.

  The oscillating flow generator according to the present invention will be described with reference to FIGS. FIG. 1 is a schematic diagram showing the configuration of an oscillating flow generator. FIG. 2 is an explanatory diagram showing the operation of the oscillating flow generator.

(Constitution)
Since the oscillating flow generator 1 is a device that reciprocally vibrates the liquid in the flow path 2, FIG. As shown in this figure, the oscillating flow generating device 1 includes a flow direction switching valve 3 disposed in the flow path 2 and a pump 4 that gives energy for reciprocating the liquid in the flow path 2. Yes. The flow direction switching valve 3 switches the flow direction of the liquid in the flow path 2. This will be described in detail below.

(Flow path)
First, the flow path 2 connected to the vibration flow generator 1 which is this invention is demonstrated. The flow path 2 is, for example, a pipe having a circular cross section or a square cross section, and is formed in a closed ring shape as shown in FIG. In FIG. 1, an intermediate portion of the flow path 2 is omitted and schematically shown. However, the cross-sectional shape is not limited to this shape. In this embodiment, the flow path 2 is made of aluminum, and liquid water is sealed inside. In addition, although the flow path 2 may be formed with another material, a material with good heat conductivity and heat conductivity is preferable. Moreover, the liquid enclosed inside is not limited to water.

  Then, by arranging the flow direction switching valve 3 to be described later in the flow path 2, in other words, by connecting the flow direction switching valve 3 to both ends of the flow path 2, the liquid in the flow path 2 can be obtained. Will reciprocate. That is, the fluid does not flow in a certain direction, and the flow direction is switched as time passes and reciprocates (see arrows A1, A2, and A3).

(Flow direction switching valve)
The flow direction switching valve 3 is formed with a first inflow / discharge port 32a connected to the flow path 2 and a second inflow / discharge port 32b. The inflow / discharge ports 32a and 32b communicate with each other. An in-valve channel 31 is formed inside. Thereby, the liquid is discharged from the in-valve channel 31 to the channel 2 through the inflow / discharge ports 32a and 32b, and the liquid flows into the in-valve channel 31 from the channel 2 (arrows A1, A1). A3). In the following description, the first and second inflow / outlet ports 32a and 32b may be simply referred to as a liquid inlet / outlet port.

  Here, in this embodiment, the valve flow path 31 in the flow direction switching valve 3 is formed in an annular shape. In particular, in FIG. 1, it is formed in an annular shape, and the liquid flows along the annular flow path 31. The inflow / discharge ports 32a and 32b are disposed at substantially opposite positions. In other words, it is located opposite to both ends of the diameter of the annular valve passage 31. As will be described later, the shape of the in-valve channel 31 of the flow direction switching valve 3 is not limited to an annular shape.

  Further, the flow direction switching valve 3 is provided with an inlet 33 a for the discharge liquid discharged from the pump 4 and a discharge port 33 b for the pump 4. As shown in FIG. 1, the arrangement location is a facing portion between the first inflow / discharge port 32a and the second inflow / discharge port 32b provided as described above, and the inflow port 33a and the discharge port 33b. Are also located opposite to both ends of the diameter of the annular valve passage 31. In particular, in the present embodiment, the first inflow / discharge port 32a, the discharge port 33b, the second inflow / discharge port 32b, and the inflow port 33a are arranged at approximately equal intervals in this order, and the interval between adjacent ones is set. It is about 90 degrees. In the following description, the inlet 33a and the outlet 33b may be simply referred to as a liquid inlet / outlet.

  Further, the flow direction switching valve 3 is provided with a partition member 34 for partitioning the in-valve flow path 31 and a movable means (not shown) for moving the partition member 34. The partition member 34 includes a communication path that connects the in-valve channel 31 to the above-described inlet 33a and the first inflow / discharge port 32a, and a communication path that connects the discharge port 33b and the second inflow / discharge port 32b. It acts to divide into the first state divided into two. Further, by being moved by the movable means, the in-valve flow path 31 is communicated between the inflow port 33a and the second inflow / discharge port 32b, and the discharge port 33b and the first inflow / outlet port 32a. It acts also to partition into the 2nd state divided into the communicating passage which makes. Further, the first state and the second state are alternately switched by being further moved.

  At this time, in each of the first and second states, the liquid inlets and outlets forming the respective communication paths are arranged adjacent to each other, so that the inside of the valve flow path 31 can be easily partitioned. In addition, since the liquid inlets and outlets are arranged at substantially equal intervals, switching between the first state and the second state can be easily performed. That is, as described later, the two states can be switched by rotating the partition member 34. The state in which the valve flow path 31 is partitioned will be described in detail later when the operation is described.

  The partition member 34 in the present embodiment is specifically a substantially columnar member (partition body) having a predetermined height, and two partition walls projecting in the radial direction of the column on the side surface thereof. 34a and 34b are provided. And these partition walls 34a and 34b are uniformly formed in the side surface of the partition main body which is a column shape along a height direction. Further, the projecting ends of the partition walls 34a and 34b are provided with seal members 34aa and 34ba made of rubber members projecting further outward in the radial direction of the columnar member which is the partition body, and the partition walls 34a and 34b. It is uniformly formed at the protruding end of.

  The two partition walls 34a and 34b have substantially the same configuration, and are provided at opposing positions on the side surface of the cylindrical partition body. That is, the two partition walls 34a and 34b are respectively disposed at positions on both ends of the diameter passing through the center of the circle that is the end face of the partition main body.

  Here, the internal shape of the flow direction switching valve 3 provided with the partition member 34 is formed in a substantially cylindrical shape corresponding to the partition member 34. Its height is substantially the same as that of the partition member 34, and its diameter is substantially the same as the length connecting both projecting ends of the partition walls 34a and 34b. That is, the inner space of the flow direction switching valve 3 is formed to have an outer diameter larger than the partition body having a cylindrical shape by the partition walls 34 a and 34 b, and between the side surface of the partition body and the inner surface of the valve 3. The space formed in this forms the in-valve flow path 31 filled with the liquid. For this reason, in this embodiment, the in-valve channel 31 is formed in an annular shape as described above. And this in-valve flow path 31 will be in the state partitioned by each partition wall 34a, 34b, and, thereby, the 1st state mentioned above and the 2nd state are formed.

  The movable means (not shown) is a motor as rotational drive means for driving the columnar partition member 34 so as to rotate about the center of the circle, and is provided outside the flow direction switching valve 3. And since the inside of the flow direction switching valve 3 is filled with liquid, the portion where the shaft that transmits the rotational driving force to the partition member 34 is inserted into the flow direction switching valve 3 is in a sealed state, The inside of the vibration direction switching valve is sealed.

  Then, when the motor as the rotation driving means is driven, the seal members 34aa, 34ba of the partition walls 34a, 34b described above rotate in contact with the inner wall of the flow direction switching valve 3 (for example, the direction indicated by the arrow A7). Thus, each communication path is formed in the space partitioned by the partition member 34. Accordingly, the liquid surely flows in or is discharged from each of the liquid entrances 32a, 32b, 33a, and 33b partitioned to communicate with each other.

  However, it is preferable that the partition walls 34a and 34b or the seal members 34aa and 34ba protrude and form a completely sealed state until the seal members 34aa and 34ba come into contact with the inner wall of the valve 3. It does not have to be. That is, the state in which the in-valve flow path 31 is partitioned by the partition member 34 does not mean that each communication path is completely partitioned from the other communication paths. It is enough if it can be generated.

(pump)
Next, the pump 4 will be described. The pump 4 is, for example, a one-way flow pump that sucks liquid from the suction port and applies pressure to the liquid by the centrifugal force and discharges it from the discharge port by an impeller that rotates using a motor as a drive source. It has a discharge force. And it connects to the inflow port 33a from the pump of the vibration direction switching valve 3 mentioned above, and the discharge port 33b to a pump. That is, the discharge port 41 of the pump 4 is connected to the inlet 33 a of the flow direction switching valve 3, and the inlet 42 of the pump 3 is connected to the discharge port 33 b of the valve 3.

And as the pump 4 in a present Example, the DC pump which integrated the impeller and the rotor which Panasonic Communications (former Kyushu Matsushita Electric Corp.) announced in 2000 is applicable, for example. This is a very small, thin and lightweight micro pump having a lift of 200 mmH ₂ O, a flow rate of 100 ml / min, outer dimensions [W, D, H]: 38 mm × 38 mm × 23 mm, and a mass: 45 g. At present, even smaller and higher performance pumps can be realized.

  However, the pump 4 is not limited to the structure described above. For example, a diaphragm pump using a reciprocating motion or a pump using a piezoelectric bimorph element may be used. Furthermore, the present invention is not limited to these, and any pump that discharges liquid in one direction may be used.

  In this embodiment, since the suction port 42 of the pump 4 and the discharge port 33b of the valve 3 are separated from each other, they are connected by a pump flow path 43 which is a flow path different from the flow path 2 described above. . The pump flow path 43 is a circular cross-section pipe in this embodiment, but the cross-sectional shape and the like are not limited to this.

  And the liquid in this pump flow path 43 is flowing so that it may circulate in a fixed direction by the effect | action of the pump 4 (refer arrow A4, A5, A6). It should be noted that the discharge port 41 of the pump 4 and the inflow port 33a of the valve 3 are preferably connected in close proximity, but even if they are separated, they may be connected by another pump flow path. .

  As will be described later, the pump 4 has a discharge pressure sufficient to allow the liquid flowing into the flow direction switching valve 3 to flow into the flow path 2. This is set according to the cross-sectional area of the flow path 2 and the like.

(Operation)
Next, the operation of the oscillating flow generator 1 having the above configuration will be described with reference to FIG. In FIG. 2, the configuration of the flow direction switching valve 3 disclosed in FIG. 1 is illustrated in a simplified manner. That is, the partition member 34 that partitions the in-valve flow path 31 is configured as a single partition plate formed by only the partition walls 34a and 34b. The centers of the partition walls 34a and 34b are connected to a rotation shaft of a rotation drive means (not shown), and are configured to rotate clockwise about the center. In this case, the in-valve channel 31 does not have an annular shape, but the present invention may have such a configuration. In the following description, the partition member 34 is illustrated as partition walls 34a and 34b.

  First, the state shown in FIG. 2A is the first inflow in which one partition wall 34a communicates with the flow path 2 when the partition walls 34a and 34b rotate in the clockwise direction (see arrows A11 and A12). It shows immediately after passing through the discharge port 32a. Accordingly, the other partition wall 34b located on the opposite side is immediately after passing through the second inflow / discharge port 32b. Then, until these partition walls 34a and 34b are rotated and positioned as shown by dotted lines (see reference numerals 34a 'and 34b'), the first inflow / outlet port 32a through which one partition wall 34a communicates with the flow path 2 is provided. It is located between the discharge port 33 b to the pump 4, and the other partition wall 34 b is located between the second inflow / discharge port 32 b communicating with the flow path 2 and the inflow port 33 a from the pump 4. .

  In the above state, the flow direction switching valve 3, that is, the in-valve flow path 31, is divided into two spaces by the two partition walls 34 a and 34 b that are the partition members 34 and is in the first state (α). That is, the communication path (portion indicated by reference numeral α1) that communicates the inlet 33a from the pump 4 and the first inflow / discharge port 32a communicating with the flow path 2, and the discharge port 33b to the pump 4 and the flow path 2 are communicated. It is in a state of being partitioned into a communication path (portion indicated by reference numeral α2) communicating with the second inflow / discharge port 32b (see FIG. 2A).

  When the inside of the flow direction switching valve 3 is in the first state (α) described above, first, the liquid discharged from the inflow port 33a by the pump 4 enters the code α1 of the in-valve channel 31. It flows into the communication path shown (arrow A13). Then, in the communication path α1, the liquid flows toward the first inflow / discharge port 32a that communicates with the flow path 2 that can be the only outlet (arrow A14), and flows into the flow path 2 from the first inflow / discharge port 32a ( Arrow A15). Accordingly, the liquid in the flow path 2 is pushed out toward the second inflow / discharge port 32b, and is discharged from the second inflow / discharge port 32b to the in-valve flow path 31 (arrow A16). ). Then, in the communication path indicated by symbol α2 of the valve flow path 31, the liquid flows from the second flow path discharge port 32b toward the discharge port 33b to the pump 4 (arrow A17) and flows into the discharge port 33b ( Arrow A18). The flow of the liquid (arrows A16, A17, A18) is also urged by the suction of the liquid from the discharge port 33b by the action of the pump 4.

  Thus, in the first state, the liquid flows in the in-valve flow path 31, so that the liquid flows in the direction indicated by the arrow A 19 in the pump flow path 43 and in the direction indicated by the arrow A 20 in the flow path 2. To flow.

  Subsequently, when the predetermined time passes and the partition walls 34a and 34b further rotate, the state shown in FIG. The state shown in this figure is immediately after one partition wall 34 a passes through the discharge port 33 b to the pump 4, and accordingly, the other partition wall 34 b located on the opposite side is the inlet from the pump 4. It is immediately after passing 33a. Then, until these partition walls 34a and 34b are rotated and positioned as indicated by dotted lines (see reference numerals 34a 'and 34b'), one partition wall 34a is connected to the discharge port 33b and the flow path 2 to the pump 4. The other partition wall 34b is positioned between the inlet 33a from the pump 4 and the first inlet / outlet 32a communicating with the flow path 2. .

  Also in the above state, the in-valve channel 31 is divided into two spaces by the two partition walls 34a and 34b, which are the partition members 34, as in the first state described above, but the partition state is different. That is, the communication path (portion denoted by β1) that communicates the inflow port 33a from the pump 4 and the second inflow / discharge port 32b that communicates with the flow path 2, and the discharge port 33b to the pump 4 and the flow path 2 communicate. It becomes the 2nd state (beta) divided into the communicating path (part shown by code | symbol (beta) 2) which connects the 1st inflow discharge port 32a (refer FIG.2 (b)).

  When the inside of the flow direction switching valve 3 is in the second state (β), first, the liquid discharged from the inflow port 33a by the pump 4 is indicated by the symbol β1 of the in-valve channel 31. It flows into the communication path (arrow A33). Then, in the communication path β1, the liquid flows (arrow A34) toward the second inflow / discharge port 32b communicating with the flow channel 2 that can be the only outlet, and flows into the flow channel 2 from the second inflow / discharge port 32b ( Arrow A35). Along with this, the liquid in the flow channel 2 is pushed out toward the first inflow / discharge port 32a, and is discharged from the first inflow / discharge port 32a to the in-valve flow channel 31 (arrow A36). ). Then, in the communication path indicated by symbol β2 of the in-valve flow path 31, the liquid flows from the first flow path discharge port 32a toward the discharge port 33b to the pump 4 (arrow A37) and flows into the discharge port 33b (arrow). A38). The flow of the liquid (arrows A36, A37, A38) is also urged by the suction of the liquid from the discharge port 33b by the action of the pump 4.

  As described above, in the second state (β), the liquid flows in the in-valve channel 31, so that the liquid in the pump channel 43 moves to the arrow A39 in the same direction as the arrow A19 in the first state (α). It flows in the direction shown, and flows in the flow path 2 in the direction shown by the arrow A40 in the direction opposite to the arrow A20 in the first state (α).

  When the partition walls 34a and 34b as the partition member 34 are further rotated by the rotation driving means, the first state (α) and the second state (β) are repeated.

  When the flow direction in the flow path 2 to which the oscillating flow generator 1 according to the present invention described above is connected is collected, the first flow and the second state are repeated in the flow path 31 in the valve, thereby Although the flow direction of the liquid is always constant in the path 43 (see arrows A19 and A39), the flow direction of the liquid is reversed in the flow path 2 (see arrows A20 and A40). That is, since the flow direction in the flow path 2 is alternately changed by the rotation of the partition walls 34a and 34b, the liquid reciprocates in the flow path 2, thereby generating an oscillating flow.

  In particular, in the invention of the present application, since the liquid is constantly pushed out into the valve flow path 31 using the pump 4, a high pressure can be applied to the liquid so that the liquid flows into the flow path 2. Can be reliably generated. At this time, by controlling the discharge amount of the pump 4, the flow rate of the liquid flowing in the flow path 2 can be adjusted, and the amplitude of the reciprocating flow can be easily adjusted.

  And since it is the structure of switching a flow direction in the flow path 31 in a valve, since a reciprocating flow can be implement | achieved using the normal pump which discharges a liquid only to one direction, size reduction of an apparatus can be achieved. .

  Furthermore, since the flow direction is switched only by rotating the partition walls 34a and 34b, which are the partition members 34, the apparatus can be simplified and a low output motor or the like can be used as a drive source. Since it can be used, the apparatus can be reduced in size and cost. And since the switching speed of an oscillating flow can be changed by changing the rotational speed of the partition member 34, the frequency control of an oscillating flow can also be performed easily. Furthermore, since the frequency of the vibration flow can be increased by increasing the rotation speed, a high-frequency vibration flow can be generated with a simple device.

  In this embodiment, as a configuration in the flow direction switching valve 3 for switching between the first state and the second state, a case where a rotation driving means for rotating the partition member 34 that partitions the valve flow path 31 is used. Although described, it is not limited to such a configuration. Any configuration may be used as long as the intra-valve channel 34 can be switched between the first state and the second state.

  Next, an example in which the above-described oscillatory flow generator is applied to a heat exchanger will be described with reference to FIGS. FIG. 3 is a schematic diagram showing the configuration of the heat exchanger. FIG. 4 is a diagram showing the configuration of the serpentine channel. 5 to 6 are schematic diagrams for explaining the operation principle of the heat exchanger.

(Constitution)
The heat exchanger 10 in the present embodiment is provided with the vibration flow generator 1 connected to both ends of the heat transfer tube 20, and by reciprocating the liquid inside the heat transfer tube 20, from the heat absorption part of the heat transfer tube 20. It constitutes a heat exchanger that transfers heat to the heat radiating section. And especially the heat exchanger tube 20 is formed in the serpentine channel 20 as shown to Fig.3 (a). That is, the flow path 2 is formed to meander so as to reciprocate at a predetermined length. The flow direction switching valve 3 and the pump 4 constituting the oscillating flow generator 1 and the configuration inside the valve 3 are the same as those described above. And the heat exchanger 10 which showed the serpentine channel 20 in more detail is shown in FIG.3 (b).

  As shown in this figure, the serpentine channel 20 has a plurality of channels of a predetermined length arranged in parallel, and each channel is connected to one adjacent channel at its end. Thus, one flow path is formed as a whole. More specifically, first, the flow path 20a extending a predetermined distance from one end portion 21 connected to the first inflow / discharge port 32a of the flow direction switching valve 3 is formed at the end portion (FIG. 3B). The wall surface with the adjacent flow path 20b is cut off at the upper end) and communicates with the adjacent flow path 20b. The flow path 20b is adjacent to the flow path 20a extending from the one end 21 and extends toward the one end 21. At the end, the wall surface with another adjacent flow path 20c is provided. Is cut out and communicated with the flow path 20c. By repeating such a configuration, one serpentine channel is formed, and the end thereof is connected to the second inflow / discharge port 32b of the flow direction switching valve 3 as the other end 22 of the serpentine channel.

  Further, in the vicinity of both ends of each flow path 20a and the like constituting the serpentine flow path 20, a heat absorbing portion 20A and a heat radiating portion 20B are formed at positions separated from each other. That is, the portion corresponding to the heat absorbing portion 20A is in contact with the heating element or disposed at the heat generating portion. In addition, a portion corresponding to the heat radiating portion 20B is formed with a heat radiating member such as a fin or disposed at a low temperature portion. However, no member may be provided in the heat dissipation part 20B. It suffices if it is located in an environment where there is no heating element in the surroundings and heat can be released. In addition, it is not limited to setting the heat absorption part 20A and the thermal radiation part 20B to the position shown in FIG.3 (b). For example, the heat absorption part 20A may be set on the vibration direction switching valve 3 side.

  Here, a more specific configuration of the serpentine channel 20 and a manufacturing method thereof will be described with reference to FIG. 4A is a partial cross-sectional view of the serpentine channel 20 as viewed from above, and FIG. 4B is a cross-sectional view taken along line AA in FIG.

  The serpentine channel 20 is formed of an aluminum alloy extruded profile. That is, a plurality of thin tubes 20a, 20b,..., 20n are formed so as to be arranged in parallel by extrusion, and the thin tubes 20n are sandwiched between the upper plate member 23 and the lower plate member 24 and They are partitioned and arranged next to each other. Then, both end portions of the thin tube 20n are closed by end block plates 26. However, every other portion of the partition wall 25 that abuts against the end capping plate 26 is cut out to form notches 27, so that the adjacent thin tubes 20n communicate with each other at both ends thereof. A snake tube flow path is formed. And as for the thin tube located in both ends, the one end part is opening, and as mentioned above, the one and other end parts 21 and 22 are formed, and the 1st, 2 inflow discharge port 32a of the flow direction switching valve 3 is provided. 32b.

The serpentine channel 20 is formed in a substantially rectangular plate shape as shown in the figure. For example, the narrow tube 20n has a width of 1 [mm] or less and a cross-sectional area of 0.785 [mm ² ]. In addition, according to extrusion molding, it is possible to form the width | variety of a thin tube to about 0.3 [mm], for example. By forming the serpentine channel 20 narrow in this way, it is possible to increase the number of channels per unit area and to improve the performance as a heat exchanger as will be described later. And in order to adjust the flow rate of the liquid with respect to the flow path 2 in the flow direction switching valve 3, the pump flow path 43 that can be connected to the pump 4 in accordance with the narrow pipe of the serpentine flow path 20 is also formed thin, Good. The details of the serpentine channel 20 are already disclosed in JP-A-8-152282, JP-A-8-200794, and the like. However, the serpentine channel 20 in the present application is not limited to the shape described in the above document and the shape described above.

Here, since the serpentine channel 20 is formed thin as described above, in order to allow the liquid to flow into the channel 20 by the flow direction switching valve 3, it is necessary to push out the liquid at a high pressure. . For this reason, it is sufficient if the discharge pressure of the pump 2 is about 200 [mmH ₂ O] and the flow rate is 100 [ml / min].

(Operation)
Next, operation | movement of the heat exchanger 10 in a present Example is demonstrated. The operation of the flow direction switching valve 3 is the same as that of the first embodiment, whereby water, which is a liquid in the serpentine channel 20, reciprocates in the serpentine channel 20. That is, as shown in FIG. 3B, in each thin tube 20n, as shown by arrows A51, A52, etc., the heat absorbing portion 20A and the heat radiating portion 20B reciprocate so as to go back and forth. Therefore, this heat exchanger 10 acts in the same manner as a liquid reciprocating flow type heat transfer element that has been studied conventionally, and can efficiently realize heat exchange.

  Here, the principle of operation of the liquid reciprocating flow type heat transfer element will be described with reference to FIGS. FIG. 5 is a cross-sectional view of the serpentine channel 20 in the thickness direction, and shows the principle of heat exchange in one thin tube 20n.

  First, as described above, water as a fluid flows at a predetermined speed by the action of the pump 4 in the narrow tube 20n, and the upper plate member 23, the lower plate member 24, and the partition wall 25 have a boundary layer. Occurs. For convenience of explanation, a part of the liquid at this time is schematically represented by a symbol L, and boundary layers are schematically represented by symbols La and Lb (see FIG. 5A).

  In the state shown in FIG. 5 (a), the liquid L located substantially at the center of the thin tube 20n is in contact with the boundary layers La and Lb, so that it smoothly flows in the direction of the arrow A61 and reaches the heat absorbing portion 20A. Will move. At this time, since the liquid L is a liquid that has moved from the heat radiating portion 20B, its temperature is relatively low. In the heat absorbing portion 20A, heat is transmitted from the external heat source Hh to the boundary layers La and Lb via the upper plate member 23 or the lower plate member 24 (the arrows A62 and A63 and the boundary layers La and Lb). (See reference numerals Lah and Lbh).

  Then, when the liquid L moves to the heat absorbing portion 20A as shown in FIG. 5B, the heat is transferred to the liquid L from the boundary layers Lah and Lbh to which relatively high heat has already been transferred as described above. (See arrows A64 and A65), the liquid L is heated. Thereby, heat is removed from the heat source Hh itself.

  Thereafter, when the vibration direction switching valve 3 is switched and the flow direction in the narrow tube 20n is reversed, the liquid L flows in the direction of arrow A66 as shown in FIG. 5C. Then, the liquid L heated in the heat absorbing part 20A moves from the heat absorbing part 20A toward the heat radiating part 20B, and the state shown in FIG. At this time, the liquid L that has been absorbed and heated by the heat absorbing portion 20A is positioned in the heat radiating portion 20B having a low temperature, and the heat of the liquid L is a portion where the heat radiating portions 20B of the boundary layers La and Lb exist ( (Refer to arrows A67 and A68), and the liquid L is cooled.

  The heat transmitted to the boundary layers Lac and Lbc of the heat radiating part 20B is transmitted to the cooling part Hc and radiated to the external low temperature part (see arrows A69 and A70 in FIG. 5A). At the same time, the flow direction in the narrow tube 20n is switched to the state shown in FIG. And since the liquid L which moves to 20 A of heat absorption parts again is in the state cooled, heat exchange is attained as mentioned above.

  Next, the case where the amplitude of the movement of the liquid is narrower than the interval between the heat absorbing part 20A and the heat radiating part 20B and half of the heat absorbing part 20A and the intermediate part 20C of the heat radiating part 20B will be described. The state of the heat exchange will be described with reference to a diagram showing a state in which the thin tubes 20n are arranged. In FIG. 6, for convenience of explanation, the thin tubes are represented by reference numerals 20 d, 20 e, and 20 f, and the liquids that flow through them are schematically represented by reference numerals L 1, L 2, and L 3.

  First, as shown in FIG. 6A, the thin tubes 20d, 20e, and 20f are arranged adjacent to each other, and the liquids L1, L2, and L3 flowing inside the thin tubes are opposite to the liquids located next to each other. It is flowing in the direction. For example, the liquid L1 and the liquid L3 in the narrow tubes 20d and 20f arranged with the narrow tube 20e interposed therebetween flow in the same direction from the heat absorbing portion 20A toward the heat radiating portion 20B (in the directions of arrows A71 and A73). On the contrary, the liquid L2 in the thin tube 20e flows from the heat radiating portion 20B toward the heat absorbing portion 20A (in the direction of arrow A72). At this time, the liquids L1 and L3 located in the heat absorbing part 20A are in a heated state, and the liquid L2 located in the heat radiating part 20B is in a cooled state.

  Then, as described above, these liquids L1, L2, and L3 are adjacent to each other across the partition wall 25 and flow in opposite directions, and move to the intermediate portion 20C (arrows A71, A72, and A73). In the intermediate portion 20C, the heat of the liquids L1 and L3 heated by the heat absorbing portion 20A is transmitted to the partition wall 25 through the boundary layer of the intermediate portion 20C, and further transmitted to the adjacent liquid L2 and cooled. Conversely, the liquid L2 is heated.

  Next, when the movement directions of the liquids L1, L2, and L3 change as shown in FIG. 6B and become as indicated by arrows A74, A75, and A76, respectively, the liquids L1 and L1 cooled in the intermediate portion 20C as described above are used. L3 moves to the heat absorption part 20A and is heated. On the other hand, the liquid L2 heated in the intermediate part 20C moves to the heat radiating part 20B and is cooled.

  As described above, by repeatedly switching the flow direction of the liquid, even if the amplitude of the liquid does not have a length extending from the heat absorbing portion 20A to the heat radiating portion 20B, the heat moves from the heat absorbing portion 20A to the heat radiating portion 20B. .

  Thus, since the heat exchanger as a liquid reciprocating flow type heat transfer element can dissipate heat efficiently due to the presence of adjacent thin tubes, it is desirable to increase the number of such thin tubes. By narrowing the thin tubes, the number of thin tubes per predetermined cross-sectional area can be increased, and the heat radiation efficiency per unit volume (area) can be improved. In addition, when the cross-sectional area of the thin tube 20n is reduced in this way, a large pressure is required at the connection point 5 in order to allow liquid to flow into the thin tube. Therefore, by using the pump 4 that discharges the liquid in one direction, a relatively strong discharge force can be generated, and the reciprocating flow can be reliably generated in the serpentine channel 20 at a small size and at a low cost.

  Here, in the heat exchanger 10 which is a liquid reciprocating flow type heat transfer element, the amount of heat transported by the heat exchanger 10 is adjusted by adjusting the flow rate of the liquid in the serpentine channel 20, that is, the amplitude of the oscillating flow. Can be adjusted. For example, if the amplitude is set to such an extent that the liquid can move between the heat absorbing unit 20A and the heat radiating unit 20B with a single flow, efficient heat exchange can be realized. In this embodiment, the flow rate of the liquid flowing through the serpentine channel 20 can be adjusted by adjusting the discharge amount of the pump 4, so that the heat transport amount by the heat exchanger 10 can be easily adjusted. be able to.

  Moreover, in the said heat exchanger 10, the heat transport amount by the said heat exchanger 10 can be adjusted also by adjusting the frequency of an oscillating flow. For example, as the frequency increases, the number of liquid reciprocations increases and the amount of heat transport per unit time also increases. In this embodiment, the partition walls 34a and 34b, which are the partition members 34, are rotated by a motor serving as a rotational drive means, and the flow direction is thereby switched. Therefore, by controlling the rotational speed of the motor, The frequency can be adjusted. Therefore, the heat transport amount of the heat exchanger 10 can be easily adjusted by adjusting the frequency.

  Next, a specific use example of the heat exchanger described in the second embodiment will be described with reference to FIG. In the present embodiment, the heat exchanger 100 is applied to cooling the CPU equipped in the notebook personal computer 200.

  As described in the above embodiment, it is possible to reduce the size of the pump 4 constituting the heat exchanger 10 in this application, the motor that is a part of the flow direction switching valve 3, and the like, and the serpentine channel 20 As shown in FIG. 4, since it can be formed in a substantially plate shape, the entire heat exchanger 100 can be formed in a small size. For example, the pump 4 and the flow direction switching valve 3 (including a motor or the like as a movable means) are arranged in a plane, and these are accommodated in a flow source accommodation portion 101 extending in a plate-shaped serpentine channel 20. By doing so, the heat exchanger 100 can be formed in a substantially plate shape. However, the heat exchanger 100 is not limited to such a shape. Further, the positions of the heat absorbing part 20A and the heat radiating part 20B of the heat exchanger 100 are not limited to positions to be described later, and need only be separated by a predetermined distance. In other words, the portion with which the heating element abuts may be any end of the plate-shaped heat exchanger 100.

  And the heat exchanger 100 is accommodated in the main-body part 201 of the notebook personal computer 200, as shown to Fig.7 (a). At this time, if the CPU (arithmetic processing unit) 210 accommodated in the main body 201 is placed and accommodated in the heat absorbing part 20A of the heat exchanger 100, and a heat radiating means is appropriately provided in the heat radiating part 20B. Good.

  Thus, since the heat exchanger 100 described in the present application can be configured very compactly because of its simple configuration, it can be sufficiently accommodated in the main body 201 of the notebook computer 200 and has high heat transport efficiency. Can be demonstrated. Therefore, in recent years, with the downsizing of the notebook personal computer 200, it is possible to efficiently perform cooling of the CPU, which is increasingly heated.

  The flexible heat exchanger 100 can also be configured by configuring the serpentine channel 20 at locations other than the heat absorbing portion 20A and the heat radiating portion 20B with an elastic member 20F such as a resin. Then, as shown in FIG. 7B, the portion formed by the elastic member 20 </ b> F of the serpentine channel 20 is disposed in the hinge portion 202 so that the heat exchanger 100 extends from the main body portion 201 to the display portion 203. At the same time, the CPU 210 is placed on the heat absorbing portion 20A. At this time, since the part located in the display unit 20B becomes the heat radiating part 20B, a heat radiating means may be provided as appropriate.

  Thereby, the heat radiating part 20B can be moved away from the main body part 201 where the heat generating device exists, and the display part 203 having a large area where the heat radiating part 20B is exposed to the outside air can also be used as the heat radiating means. The CPU 210 can dissipate heat efficiently. In order to easily form the serpentine channel 20, the entire serpentine channel 20 may be formed of an elastic member.

  Here, the heat exchangers 10 and 100 described in the present application are not limited to being used for cooling the heat generating device in the notebook computer 200. It may be used for cooling a heat generating device that is incorporated in another electric appliance and has an adverse effect, and may be used for cooling another heat generating element.

  The oscillating flow generator according to the present invention is connected to the heat transfer tube of a heat exchanger as a liquid reciprocating flow type heat transfer element, and can generate an oscillating flow in the heat transfer tube, thereby exchanging heat more efficiently. Since it can be used as a container, it can be used industrially. In particular, since the configuration is simple, the heat exchanger itself can be miniaturized and can be easily used for small electronic devices such as notebook computers.

It is a figure which shows the outline of a structure of the oscillating flow generator in Example 1. FIG. 2A and 2B are explanatory diagrams for explaining the operation of the oscillating flow generator disclosed in FIG. FIG. 3 is a schematic diagram illustrating a configuration of a heat exchanger according to the second embodiment. FIG. 3A is a diagram schematically showing the configuration, and FIG. 3B is a diagram specifically showing the serpentine channel. FIG. 4 is a diagram showing a further specific configuration of the serpentine channel disclosed in FIG. 3B, FIG. 4A is a plan partial sectional view, and FIG. 4B is FIG. AA sectional view in FIG. FIGS. 5A to 5D are schematic views for explaining the heat exchange action when the serpentine channel is viewed from the side. FIGS. 6A to 6B are schematic views for explaining the heat exchange action when the serpentine channel is viewed from above. FIGS. 7A and 7B are diagrams illustrating specific usage examples in the third embodiment of the heat exchanger disclosed in the second embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oscillatory flow generator 2 Flow path 3 Flow direction switching valve 4 Pump 10 Heat exchanger 20 Serpentine flow path 31 Intravalve flow path 32a First inflow discharge port 32b Second inflow discharge port 33a Inflow port 33b Discharge port 34 Partition member 34a 34b Partition wall

Claims (6)

An oscillating flow generator (1) for reciprocating a liquid in a flow path (2),
A flow direction switching valve (3) disposed in the flow path (2), and a pump (4) for providing energy for reciprocating the liquid in the flow path (2),
The flow direction switching valve (3) includes an in-valve flow path (31) formed in the valve (3) and a first inflow / discharge port that communicates with the flow path (2) and flows back and forth. (32a) and a second inflow / discharge port (32b), an inflow port (33a) for the discharge liquid generated from the pump, and a discharge port (33b) to the pump,
The in-valve channel (31)
A communication path (α1) communicating the inlet (33a) from the pump and the first inflow / discharge port (32a) of the reciprocating flow, and the second inflow of the reciprocating flow to the pump (33b). A first state (α) partitioned into a communication passage (α2) communicating with the discharge port (32b);
A communication path (β1) communicating the inlet (33a) from the pump and the second inflow / discharge port (32b) of the reciprocating flow, and the first inflow of the reciprocating flow and the discharge port (33b) to the pump In a second state (β) partitioned into a communication passage (β2) communicating with the discharge port (32a),
An oscillating flow generator that can be switched alternately. The first inflow / discharge port (32a) and the second inflow / discharge port (32b) communicating with the flow path are respectively disposed in opposing portions of the flow path in the valve,
An inflow port (33a) from the pump to the pump is provided in an opposite portion between the first inflow / outlet port (32a) and the second inflow / outlet port (32b) in the in-valve channel (31). The oscillating flow generator according to claim 1, wherein the discharge port (33 b) is provided.   The flow direction switching valve (3) alternately switches and partitions between the first state (α) and the second state (β) in which the in-valve channel (31) is partitioned into the communication paths. The oscillating-flow generator of Claim 1 or 2 provided with the partition member (34) and the movable means which moves this partition member so that it may become said 1st state and said 2nd state.   The movable means is constituted by a rotational drive means for rotating the partition member, and by rotating the partition member, the in-valve flow path (31) is changed between the first state (α) and the second state ( The oscillatory flow generator according to claim 3, wherein the oscillatory flow is switched alternately to β). A heat exchanger that transfers heat from the heat absorbing portion of the heat transfer tube to the heat radiating portion by reciprocating the liquid inside the heat transfer tube,
The heat exchanger which connects the vibration flow generator of Claims 1 thru | or 4 to the both ends of the said heat exchanger tube.   The heat exchanger according to claim 5, wherein the heat transfer tube is formed of a serpentine channel.