JP2006071173A - Evaporator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To almost equally distribute liquid refrigerant to a plurality of heat exchanging tubes 11 from the inside of a lower tank 3. <P>SOLUTION: An inner pipe 19 is mounted in the lower tank in a state of being extended from an inlet portion of the lower tank 3 to the neighborhood of a depth portion, closed at its tip, and connected with an expansion valve 21 of an air conditioner for a vehicle, at its basic end portion. A plurality of liquid jetting holes 23 for mainly jetting the liquid refrigerant are formed at intervals on a lower half of the inner pipe 19, and a plurality of gas blow-off holes 25, 27 for mainly blowing off the gaseous refrigerant are formed at intervals on an upper half of the inner pipe 19. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an evaporator that is used in a vehicle air conditioner and evaporates liquid refrigerant to cool external air.

  A general evaporator will be briefly described as follows.

  That is, the evaporator includes a lower tank, and the lower tank is connected to an expansion valve in the vehicle air conditioner and extends in the width direction of the evaporator. An upper tank is disposed above the lower tank, and the upper tank is configured to extend in the width direction.

  Between the lower tank and the upper tank, a plurality of heat exchange tubes are disposed at intervals in the width direction (in other words, the longitudinal direction of the lower tank and the upper tank). Here, a lower end portion of each heat exchange tube is communicated with the lower tank, and an upper end portion of each heat exchange tube is communicated with the upper tank. A plurality of corrugated fins are disposed between adjacent heat exchange tubes.

  Therefore, when the refrigerant in the gas-liquid mixed state is sent from the expansion valve side into the lower tank, the refrigerant can flow from the lower tank side to the upper tank side in the plurality of heat exchange tubes. Thereby, a liquid refrigerant | coolant can be evaporated in several heat exchange tubes, and the external air which distribute | circulates the periphery of several said heat exchange tubes and several said fins can be cooled.

  On the other hand, the evaporated gaseous refrigerant is sent from the upper tank to the compressor side in the vehicle air conditioner.

In addition, there exists a thing shown to patent document 1 as a prior art relevant to this invention.
JP-A-9-166368

  By the way, as described above, the refrigerant sent from the expansion valve side into the lower tank is in a gas-liquid mixed state, and due to the difference in inertia force, the liquid refrigerant is sent to the vicinity of the inner part in the lower tank. On the other hand, the gaseous refrigerant is hardly sent to the vicinity of the inner part of the lower tank. For this reason, the liquid refrigerant cannot be divided into the plurality of heat exchange tubes from the lower tank substantially evenly, and the liquid refrigerant drifts. Therefore, the external air that flows around the plurality of heat exchange tubes and the plurality of fins cannot be cooled substantially evenly, resulting in uneven temperature of the conditioned air, and the cooling performance of the vehicle air conditioner decreases. There is a problem of doing.

In the invention described in claim 1, in an evaporator that is used in a vehicle air conditioner and cools external air by evaporating a liquid refrigerant,
A lower tank configured to extend in the width direction;
An upper tank disposed above the lower tank and configured to extend in the width direction;
The lower tank and the upper tank are disposed at an interval in the width direction. Each lower end portion is communicated with the lower tank, and each upper end portion is disposed in the upper tank. A plurality of heat exchange tubes in communication;
A plurality of fins disposed between adjacent said heat exchange tubes;
The vehicle is disposed in the lower tank, is configured to extend in the width direction from the inlet portion of the lower tank to the back thereof, and is configured to close the distal end. A plurality of gas ejection holes that are connected to the expansion valve and are formed at intervals in the width direction to eject mainly liquid refrigerant to the lower half, and to eject mainly gaseous refrigerant to the upper half An inner pipe having holes formed at intervals in the width direction;
It is characterized by comprising.

  Here, the “width direction” is the width direction of the evaporator, and has the same meaning as the longitudinal direction of the lower tank and the longitudinal direction of the upper tank.

  According to the invention specific matter of the first aspect, when the refrigerant in a gas-liquid mixed state is sent from the expansion valve side into the inner pipe, the gaseous refrigerant as the upper layer and the liquid as the lower layer in the inner pipe. The refrigerant flows in an overlapping state. Then, the gaseous refrigerant is mainly ejected from the plurality of gas ejection holes, and the liquid refrigerant is mainly ejected from the plurality of liquid ejection holes, so that the refrigerant in a gas-liquid mixed state enters the lower tank. Sent.

  Here, the inner pipe is configured to close the tip, and the plurality of liquid ejection holes are formed in the lower half of the inner pipe at intervals in the width direction. The liquid refrigerant can be ejected from all the liquid ejection holes evenly while maintaining the pressure of approximately equal. Therefore, the liquid refrigerant can be divided substantially equally from the lower tank to the plurality of heat exchange tubes.

  Furthermore, as described above, when the refrigerant in a gas-liquid mixed state is sent into the lower tank, the refrigerant can flow from the lower tank side to the upper tank side in the plurality of heat exchange tubes. Thereby, a liquid refrigerant | coolant can be evaporated in several heat exchange tubes, and the external air which distribute | circulates the periphery of several said heat exchange tubes and several said fins can be cooled.

  On the other hand, the evaporated gaseous refrigerant flows into the upper tank from a plurality of heat exchange tubes, and is sent from the upper tank to the compressor side in the vehicle air conditioner.

  In the invention specific matter of claim 2, in addition to the invention specific matter of claim 1, the plurality of liquid ejection holes have the same shape and are formed at equal intervals in the width direction. The plurality of gas ejection holes have the same shape and are formed at equal intervals in the width direction.

  According to the invention specific matter of claim 2, in addition to the action of the invention specific matter of claim 1, the plurality of liquid ejection holes have the same shape and are formed at equal intervals in the width direction. Thus, the plurality of gas ejection holes have the same shape and are formed at equal intervals in the width direction, so that even if the dimension change in the width direction of the evaporator occurs, It is only necessary to change the total length of the inner pipe.

  In the invention according to claim 3, in addition to the matters specifying the invention according to claim 2, the gas ejection holes are formed at equal intervals in the width direction in the upper half of one side of the inner pipe. The plurality of first gas ejection holes and a plurality of second gas ejection holes formed at equal intervals in the width direction in the upper half of the other side of the inner pipe.

  According to the invention specific matter of claim 3, the same effect as the effect of the invention specific matter of claim 2 is obtained.

  According to a fourth aspect of the invention, in addition to the invention specific matter of the third aspect, the inner pipe includes the plurality of first gas ejection holes and the plurality of second gas ejection holes. It is comprised so that it may arrange | position alternately along the width direction.

  According to the invention specific matter of claim 4, the same effect as the effect of the invention specific matter of claim 3 is obtained.

  In the invention according to claim 5, in addition to the invention specific matter according to any one of claims 2 to 4, the plurality of heat exchange tubes are arranged in the width direction or the like. The pitch of the plurality of liquid ejection holes arranged at intervals is the same as the pitch of the plurality of heat exchange tubes, and each of the liquid ejection holes is directly below the lower end portion of the heat exchange tube in a corresponding relationship. It is characterized by being located respectively.

  According to the invention specific matter of claim 5, in addition to the action of the invention specific matter according to any one of claims 2 to 4, the pitch of the plurality of liquid ejection holes is a plurality of pitches. Since the liquid ejection holes have the same pitch as that of the heat exchange tubes and are located directly below the lower end portions of the heat exchange tubes in a corresponding relationship, the liquid refrigerant flows along the outer peripheral surface of the inner pipe. It is possible to improve the flow-dividing property of the liquid refrigerant with respect to the plurality of heat exchange tubes while effectively exhibiting the Counder effect of flowing.

  In the invention described in claim 6, in addition to the matters specifying the invention described in claim 5, each of the gas ejection holes is respectively located directly below the fins in a corresponding relationship. And

  According to the invention specific matter of the sixth aspect, the same effect as the effect of the invention specific matter of the fifth aspect is achieved.

  In the invention according to claim 7, in addition to the invention specific matter according to claim 4, the plurality of heat exchange tubes are arranged at equal intervals in the width direction, and the plurality of liquid ejection holes Is the same as the pitch of the plurality of heat exchange tubes, each of the liquid ejection holes is located directly below the lower end of the corresponding heat exchange tube, and each of the gas ejection holes is The pitches of the plurality of first gas ejection holes and the pitches of the plurality of second gas ejection holes are respectively 2 below the pitch of the plurality of heat exchange tubes. Each of the first gas ejection holes and each of the second gas ejection holes are respectively located directly below the fins in a corresponding relationship.

  According to the invention specific matter of the seventh aspect, in addition to the effect of the invention specific matter of the fourth aspect, the pitch of the plurality of liquid ejection holes is the same as the pitch of the plurality of heat exchange tubes, Since the liquid ejection holes are respectively located directly below the lower ends of the heat exchange tubes that are in a corresponding relationship, the liquid refrigerant flows along the outer peripheral surface of the inner pipe while effectively exhibiting the Counder effect. In addition, it is possible to improve the flow distribution of the liquid refrigerant with respect to the plurality of heat exchange tubes.

  According to the invention described in any one of claims 1 to 7, since the liquid refrigerant can be fed substantially uniformly over the width direction in the lower tank, the liquid refrigerant From the inside of the lower tank to the plurality of heat exchange tubes, so that the outside air flowing around the plurality of heat exchange tubes and the plurality of fins is cooled substantially uniformly. It is possible to improve the cooling performance of the vehicle air conditioner by eliminating unevenness in the temperature of the conditioned air. In particular, according to the invention according to any one of claims 5 to 7, the diversion property of the liquid refrigerant to the plurality of heat exchange tubes is enhanced while the Counder effect is effectively exhibited. Therefore, it is possible to further improve the cooling performance of the vehicle air conditioner.

  According to the invention of any one of claims 2 to 7, even if the width of the evaporator needs to be changed in size, only the total length of the inner pipe is changed. Therefore, the manufacturing cost of the evaporator can be reduced.

  An embodiment of the present invention will be described with reference to FIGS.

  Here, FIG. 1 is a cross-sectional view of the lower portion of the evaporator according to the embodiment of the present invention, FIG. 2 is a view taken along line II in FIG. 1, and FIG. FIG. 4 is a front view of the evaporator according to the embodiment, and FIG. 4 is a cross-sectional view of the lower portion of the evaporator according to another embodiment of the present invention.

  As shown in FIGS. 1 and 2, an evaporator 1 according to an embodiment of the present invention is used in a vehicle air conditioner and cools external air by evaporating a liquid refrigerant.

  The evaporator 1 includes a lower tank 3, and the lower tank 3 extends in the width direction of the evaporator 1 (the left and right directions in FIGS. 1 and 3 with reference to the direction of the drawings when the patent publication is published). It is configured. An upper tank 5 is disposed above the lower tank 3 (upward in FIGS. 1 and 3 with reference to the orientation of the drawings at the time of publication of the patent publication). The upper tank 5 is arranged in the width direction. It is comprised so that it may extend to. And the discharge pipe 7 is arrange | positioned at the exit part of the upper tank 5, One end part of this discharge pipe 7 is connected in the upper tank 5, The other end part of the discharge pipe 7 is Connected to the compressor 9.

  Between the upper tank 5 and the lower tank 3, a plurality of heat exchange tubes 11 are arranged at equal intervals in the width direction (in other words, the longitudinal direction of the tanks 3 and 5). Here, the lower end portion of each heat exchange tube 11 is communicated with the lower tank 3, and the upper end portion of each heat exchange tube 11 is communicated with the upper tank 5. A pair of side plates 13 and 15 are disposed between the upper tank 5 and the lower tank 3 so as to sandwich the plurality of heat exchange tubes 11. Further, a plurality of corrugated fins 17 are arranged between the adjacent heat exchange tubes 11, between one side plate 13 and the heat exchange tube 11, and between the other side plate 15 and the heat exchange tube. In the same manner, a plurality of corrugated fins 17 are also disposed between the two.

  An inner pipe 19 is disposed in the lower tank 3, and the inner pipe 19 is configured to extend in the width direction from the inlet portion to the back of the lower tank 3, and the tip of the inner pipe 19 is at the lower tank. It is comprised so that it may block | close with the 3 projection parts 3a. Further, the base end portion of the inner pipe 19 protrudes outward from the lower tank 3 and is connected to the expansion valve 21 in the vehicle air conditioner.

  As shown in FIG. 1 and FIG. 2, a plurality of liquid ejection holes 23 that mainly eject liquid refrigerant are formed at equal intervals in the width direction in the lowermost part, which is a part of the lower half of the inner pipe 19. Yes. Here, the plurality of liquid ejection holes 23 have the same shape, and the pitch of the plurality of liquid ejection holes 23 is the same as the pitch of the plurality of heat exchange tubes 11, and each liquid ejection hole 23 corresponds to each other. They are located directly below the lower end portions of the heat exchange tubes 11 concerned.

  A plurality of gas refrigerants are ejected to the upper half of one side of the inner pipe 19 (on the back side toward the paper surface in FIG. 1 and on the right side in FIG. 2 with reference to the orientation of the drawing at the time of publication). The first gas ejection holes 25 are formed at equal intervals in the width direction, and the other side of the inner pipe 19 (on the front side toward the paper surface in FIG. In the upper half of the left side in FIG. 2, a plurality of second gas ejection holes 27 for ejecting gaseous refrigerant are formed at equal intervals in the width direction. Here, the plurality of first gas ejection holes 25 and the plurality of second gas ejection holes 27 have the same shape, and the pitch of the plurality of first gas ejection holes 25 and the plurality of second gas ejection holes 27 are the same. The pitch is twice the pitch of each of the plurality of heat exchange tubes 11, and each first gas ejection hole 25 and each second gas ejection hole 27 are respectively located directly below the fins 17 in a corresponding relationship. It is. The inner pipe 19 is configured such that a plurality of first gas ejection holes 25 and a plurality of second gas ejection holes 27 are alternately arranged along the width direction.

  Each liquid ejection hole 23 is located directly below the lower end portion of the heat exchange tube 11 having a corresponding relationship, and each first gas ejection hole 25 and each second gas ejection hole 27 has a corresponding relationship. 4, each liquid ejection hole 23 is located directly below the corresponding fin 17, as shown in FIG. 4, and each first gas ejection hole 25 and each second gas ejection hole 25. The gas ejection holes 27 may be positioned directly below the lower ends of the heat exchange tubes 11 having a corresponding relationship.

  Next, the operation of the embodiment of the present invention will be described.

  When the gas-liquid mixed refrigerant is sent into the inner pipe 19 from the expansion valve 21 side, the gaseous refrigerant as the upper layer and the liquid refrigerant as the lower layer flow in the inner pipe 19 in an overlapping state. The gaseous refrigerant is mainly ejected from the plurality of first gas ejection holes 25 and the plurality of second gas ejection holes 27, and the liquid refrigerant is mainly ejected from the plurality of liquid ejection holes 23, thereby The liquid mixed refrigerant is sent into the lower tank 3.

  Here, the inner pipe 19 is configured so that the tip is closed by the projection 3 a of the lower tank 3, and the plurality of liquid ejection holes 23 are formed at equal intervals in the width direction at the bottom of the inner pipe 19. Therefore, the liquid refrigerant can be ejected uniformly from all the liquid ejection holes 23 while keeping the pressure in the inner pipe 19 substantially equal. Therefore, the liquid refrigerant can be divided from the lower tank 3 to the plurality of heat exchange tubes 11 approximately evenly. In particular, the pitch of the plurality of liquid ejection holes 23 is the same as the pitch of the plurality of heat exchange tubes 11, and each liquid ejection hole 23 is located directly below the lower end portion of the heat exchange tube 11 in a corresponding relationship. Further, it is possible to improve the flow-dividing property of the liquid refrigerant to the plurality of heat exchange tubes 11 while effectively exhibiting the Counder effect that the liquid refrigerant flows along the outer peripheral surface of the inner pipe 19.

  Furthermore, as described above, when the refrigerant in the gas-liquid mixed state is sent into the lower tank 3, the refrigerant can flow from the lower tank 3 side to the upper tank 5 side in the plurality of heat exchange tubes 11. Thereby, a liquid refrigerant can be evaporated in the plurality of heat exchange tubes 11, and the external air flowing around the plurality of heat exchange tubes 11 and the plurality of f fins 17 can be cooled.

  On the other hand, the evaporated gaseous refrigerant flows from the plurality of heat exchange tubes 11 into the upper tank 5 and is sent from the discharge pipe 7 to the compressor 9 side.

  In addition to the above-described operation, the plurality of liquid ejection holes 23 have the same shape and are formed at equal intervals in the width direction, and the plurality of first gas ejection holes 25 and the plurality of second gas ejection holes. 27 has the same shape and is formed at equal intervals in the width direction. Therefore, even if it is necessary to change the dimension of the evaporator 1 in the width direction, only the total length of the inner pipe 19 is changed. It ’s enough.

  As described above, according to the embodiment of the present invention, the liquid refrigerant can be fed substantially uniformly over the width direction in the lower tank 3, so that the liquid refrigerant is exchanged from the lower tank 3 into a plurality of heat exchanges. Since the air can be divided substantially uniformly with respect to the tube 11, the external air flowing around the plurality of heat exchange tubes 11 and the plurality of fins 17 can be cooled substantially uniformly, and the temperature of the conditioned air is uneven. As a result, the cooling performance of the vehicle air conditioner can be improved. In particular, since the divertability of the liquid refrigerant with respect to the plurality of heat exchange tubes 11 can be enhanced while effectively exerting the Counder effect, the cooling performance of the vehicle air conditioner can be further improved. .

  Moreover, even if it is necessary to change the dimension of the evaporator 1 in the width direction, it is only necessary to change the entire length of the inner pipe 19, so that the manufacturing cost of the evaporator 1 can be reduced.

  In addition, this invention is not restricted to description of the above-mentioned embodiment, It can implement in a various other aspect by making an appropriate change.

It is sectional drawing of the lower part of the evaporator concerning embodiment of this invention. It is the figure along the II line in FIG. It is a front view of the evaporator concerning the embodiment of the present invention. It is sectional drawing of the lower part of the evaporator of another aspect concerning embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Evaporator 3 Lower tank 5 Upper tank 9 Compressor 11 Heat exchange tube 17 Fin 19 Inner pipe 21 Expansion valve 23 Liquid ejection hole 25 1st gas ejection hole 27 2nd gas ejection hole

Claims (7)

In an evaporator that is used in a vehicle air conditioner and cools external air by evaporating a liquid refrigerant,
A lower tank configured to extend in the width direction;
An upper tank disposed above the lower tank and configured to extend in the width direction;
The lower tank and the upper tank are disposed at an interval in the width direction. Each lower end portion is communicated with the lower tank, and each upper end portion is disposed in the upper tank. A plurality of heat exchange tubes in communication;
A plurality of fins disposed between adjacent said heat exchange tubes;
The vehicular air conditioner is disposed in the lower tank, extends in the width direction from the inlet portion of the lower tank to the vicinity of the inner portion thereof, and is configured to close the distal end. A plurality of liquid ejection holes that are connected to the expansion valve in the main body and that eject liquid refrigerant mainly in the lower half at intervals in the width direction, and a plurality of gases that mainly eject gaseous refrigerant in the upper half An inner pipe having jet holes formed at intervals in the width direction;
An evaporator characterized by comprising:   The plurality of liquid ejection holes have the same shape and are formed at equal intervals in the width direction, and the plurality of gas ejection holes have the same shape and are formed at equal intervals in the width direction. The evaporator according to claim 1, wherein the evaporator is provided.   The plurality of gas ejection holes include a plurality of first gas ejection holes formed at equal intervals in the width direction in the upper half on one side of the inner pipe, and the width direction in the upper half on the other side of the inner pipe. The evaporator according to claim 2, further comprising a plurality of second gas ejection holes respectively formed at equal intervals.   The inner pipe is configured such that the plurality of first gas ejection holes and the plurality of second gas ejection holes are alternately arranged along the width direction. The described evaporator.   The plurality of heat exchange tubes are arranged at equal intervals in the width direction, and the pitch of the plurality of liquid ejection holes is the same as the pitch of the plurality of heat exchange tubes, and each of the liquid ejection holes corresponds to each other. The evaporator according to any one of claims 2 to 4, wherein the evaporator is located directly below a lower end portion of the heat exchange tube in a relationship.   The evaporator according to claim 5, wherein each of the gas ejection holes is located immediately below the fins in a corresponding relationship. The plurality of heat exchange tubes are arranged at equal intervals in the width direction, and the pitch of the plurality of liquid ejection holes is the same as the pitch of the plurality of heat exchange tubes, and each of the liquid ejection holes corresponds to each other. Each of the gas ejection holes is located directly below the lower end of the heat exchange tube in a relationship, and each of the gas ejection holes is located directly under the corresponding fin, and a plurality of the first gas ejection holes are provided. The pitch and the pitch of the plurality of second gas ejection holes are each twice the pitch of the plurality of heat exchange tubes, and each of the first gas ejection holes and each of the second gas ejection holes have a corresponding relationship. The evaporator according to claim 4, wherein the evaporator is located directly below a certain fin.

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