DE112012004635T5 - Interior condenser - Google Patents

Abstract

An indoor condenser (1, 32) housed in an HVAC unit of a heat pump system of an air conditioner for a vehicle, the indoor condenser including: a heat exchanger core (6) consisting of stacked pipes (2) and fins (4); an inlet / outlet side refrigerant tank (10, 34) to which end portions of the conduits are connected; a refrigerant tank on the other side (12) to which the other end portions of the pipes are connected; a partition wall (14) which divides an inner portion of the refrigerant tank on the inlet / outlet side into a refrigerant inlet chamber (16) and a refrigerant outlet chamber (18); a refrigerant inlet pipe (28) connected to the refrigerant tank on the inlet / outlet side to communicate with the refrigerant inlet chamber; and a refrigerant outlet pipe (30) connected to the refrigerant tank on the inlet / outlet side to communicate with the refrigerant outlet chamber, the refrigerant outlet pipe connected to the refrigerant tank on the inlet / outlet side at a position below the core.

Description

Field of engineering

The present invention relates to an indoor condenser, and more particularly to an indoor condenser housed in a HVAC unit of a heat pump system of an air conditioner of a vehicle.

State of the art

For this type of condenser, for example, a heat exchanger is used, which is used in a refrigerant circuit of an air conditioning system of a vehicle and includes a heat exchanger core, which is composed of vertically stacked pipes and fins, a refrigerant tank on the inlet / outlet side, wherein an end portion of the lines with is connected to a side portion, a refrigerant tank on the other side where the other end portions of the conduits are connected to a side portion, a partition wall which separates the inner portion of the refrigerant tank of the inlet / outlet side into a refrigerant inlet chamber and a refrigerant outlet chamber, a refrigerant inlet conduit communicating with is connected to the inlet / outlet side refrigerant tank to communicate with the refrigerant inlet chamber, and a refrigerant outlet line connected to the inlet / outlet side refrigerant tank to communicate with the refrigerant To communicate, for example, patent document 1).

The core is composed of a core portion on an end face in which a refrigerant undergoes heat exchange after having passed the refrigerant tank on the inlet / outlet side from the refrigerant inlet pipe, and a core portion on the return side in which the refrigerant heat exchanges after exposing the core portion And has used a so-called horizontal flow of the countercurrent type refrigerant in which the refrigerant flows in a horizontal direction from the core portion of the front side to the core portion of the return side stepwise, wherein an effective heat exchange between air, which is the core flows around, and the refrigerant is allowed.

Document on the state of the art

Patent documents

• Patent Document 1: Japanese Patent No. 4334311

Summary of the invention

Problems to be solved by the invention

When the heat exchanger of the above-mentioned conventional technique is housed in a HVAC (Heat Ventilation and Air Conditioning) unit of a heat pump system of a vehicle air conditioner and used as an indoor condenser whose so-called supercooling degree SC (degree) is increased, a refrigerant temperature can effectively be at the core can be lowered, and a liquid refrigerant can be increased. Accordingly, a liquid refrigerant can be surely made to flow into an expansion valve provided downstream of the condenser in the refrigerant circuit.

However, in the conventional technique, the refrigerant outlet pipe is connected above a lower end portion of the core so that the liquid refrigerant can accumulate in a pipe located below the refrigerant inlet pipe or flow back into the pipe. A flow of refrigerant in the core portion on the return side is thereby deteriorated, resulting in uneven refrigerant temperature distribution in a low-temperature region (sub-cooling region), especially near the refrigerant discharge pipe in the core region on the reflux side. Therefore, a temperature of the air blown from an air outlet of the air conditioning system of a vehicle into a vehicle interior may deviate, for example, between a driver side air outlet and a passenger side air outlet, and a temperature of the blown air in the HAVC unit may become uneven become.

Further, in the conventional technique, the refrigerant inlet pipe is connected to a side portion of the inlet / outlet side refrigerant tank at a misaligned position above the refrigerant outlet pipe, so that a high temperature region (overheat region) near the refrigerant inlet pipe, which has a relatively high temperature in the core portion of the front side, and the low-temperature region (subcooling region) near the refrigerant discharge pipe, which has a relatively low temperature in the core portion of the return side, exists at a misaligned position without overlapping each other. Therefore, a temperature shift by heat exchange between meaningful heat portions of the overheat area in the core portion on the front side and the supercooling area in the core portion on the return side is not made uniform. Therefore, the unevenness can change the refrigerant temperature distribution in the subcooling area, especially near the Refrigerant outlet in the core portion of the return side, and finally a variation in the temperature of the air blown be further enhanced.

The present invention has been made based on the above-mentioned circumstances, and an object of the present invention is to provide an indoor condenser capable of detecting a fluctuation in the temperature of the air blown out at corresponding air outlets in a HAVC. Unit to provide.

Measures to solve the problem

In order to achieve the above-mentioned object, an indoor condenser of the present invention is an indoor condenser housed in a HVAC unit of a heat pump system of an air conditioner for a vehicle, the indoor condenser including: a heat exchanger core composed of stacked pipes and fins; an inlet / outlet side refrigerant tank to which end portions of the pipes are connected; a refrigerant tank on the other side to which the other end portions of the pipes are connected; a partition wall that separates an inner portion of the inlet / outlet side refrigerant tank into a refrigerant inlet chamber and a refrigerant outlet chamber; a refrigerant inlet pipe connected to the inlet / outlet side refrigerant tank to communicate with the refrigerant inlet chamber; and a refrigerant outlet pipe connected to the inlet / outlet side refrigerant tank to communicate with the refrigerant outlet chamber, the refrigerant outlet pipe being connected to the inlet / outlet side refrigerant tank at a position below the core.

Preferably, the core is composed of a core portion on the front side in which a refrigerant undergoes heat exchange after passing through the refrigerant tank on the inlet / outlet side from the refrigerant inlet pipe, and a core portion on the return side in which the refrigerant makes heat exchange after it has passed the core portion on the front side and the refrigerant tank on the other side, and the refrigerant inlet pipe and the refrigerant outlet pipe are connected to the inlet / outlet side refrigerant tank at a point symmetric position with respect to the partition wall as the axis of symmetry and at a position where they overlap each other when viewed from a vertical direction to the dividing wall.

Preferably, the refrigerant inlet pipe and the refrigerant outlet pipe are connected to the inlet / outlet side refrigerant tank in an axisymmetric position with respect to the partition wall as the axis of symmetry.

Advantageous Effects of the Invention

According to the present invention, the refrigerant flowing through the core can be guided by gravity sequentially or stepwise through the inlet / outlet side refrigerant tank and the refrigerant outlet pipe, thereby accumulating a liquid refrigerant in a pipe by causing the pipe below the refrigerant outlet pipe and reflux of the liquid refrigerant in the pipe can be prevented because the refrigerant outlet pipe is connected to the inlet / outlet side refrigerant tank at a position below the core. Therefore, the refrigerant is caused to flow smoothly through all the pipelines, suppressing unevenness in a refrigerant temperature distribution in a subcooling area, specifically, near the refrigerant outlet piping in the core portion on the return side, and eventually suppressing unevenness in a refrigerant temperature distribution in the entire core. Accordingly, a fluctuation in a temperature of the blown-out air at respective air outlets in the HVAC unit can be reduced.

Further, according to the present invention, the core may be formed so that an overheating area near the refrigerant inlet pipe having a relatively high temperature in the core portion on the front side and the subcooling area near the refrigerant outlet pipe having a relatively low temperature in the core portion on the return side at least overlap each other in a portion, since the refrigerant inlet and the refrigerant outlet with the inlet / outlet side refrigerant tank at a point-symmetrical position with respect to the partition wall as the axis of symmetry and at a position where they, in a direction perpendicular to the partition, in at least a portion overlap, are connected. Therefore, the unevenness in the refrigerant temperature distribution in the entire core can be effectively suppressed by a temperature shift by heat exchange between sensible heating portions of the superheat region in the core portion on the front side and the supercooling region in the core portion on the return side. The fluctuation in the temperature of the blown air at respective air outlets in the HVAC unit can be effectively reduced.

Further, according to the present invention, the core may be formed so that the overheating area and the subcooling area become completely overlap, since the refrigerant inlet and the refrigerant outlet are connected to the refrigerant tank on the inlet / outlet side at an axisymmetric position with respect to the partition wall as the axis of symmetry. Therefore, the unevenness in the refrigerant temperature distribution in the entire core can be more effectively suppressed by the temperature displacement by the heat exchange between the sensible heat portions of the overheat area in the core portion on the front side and the supercooling region in the core portion on the return side. The fluctuation in the temperature of the blown air at the respective air outlets in the HVAC unit can be more effectively reduced.

Brief description of the drawings

1 FIG. 16 is a front view illustrating a schematic configuration of a capacitor according to an embodiment of the present invention. FIG.

2 is a bottom view of the capacitor in 1 seen from below.

3 is a sectional view of the capacitor in 1 in one direction AA.

4 FIG. 12 is a graph illustrating a maximum temperature difference ΔTmax (° C) of exhaust air flowing around a conventional condenser and the condenser of the present embodiment with respect to an increase in supercooling degree S.C (deg).

5 FIG. 16 is a front view illustrating a schematic configuration of a capacitor according to another embodiment of the present invention. FIG.

6 is a bottom view of the capacitor in 5 seen from below.

7 is a side view of the capacitor in 5 seen from the right side.

8th is a cross-sectional view of the capacitor in 5 in one direction BB.

Mode for carrying out the invention

The following is a capacitor 1 according to an embodiment of the present invention with reference to the drawings.

1 FIG. 16 is a front view showing a schematic configuration of the capacitor. FIG 1 represents. 2 is a bottom view of the capacitor in 1 seen from below. 3 is a cross-sectional view of the capacitor 1 in 1 in one direction AA.

For example, the capacitor 1 an indoor condenser, which is incorporated in a refrigerant circuit consisting of a heat pump spout of a not shown heat pump system of an air conditioning system for a vehicle, and in an unillustrated HVAC unit (heating ventilation and air conditioning) of the heat pump system of a vehicle air conditioning system is housed.

In the condenser 1 are a variety of wires 2 , which form a refrigerant channel, arranged in the vertical direction, and a connected rib (rib) 4 is between the respective lines 2 connected. The rib 4 forms an air ventilation channel in the condenser 1 , whereby heat exchange between a refrigerant, which through the respective lines 2 flows, and ambient air is supported. The wires 2 and the ribs 4 are alternately lined up and stacked in a vertical direction to a heat exchanger core 6 to form, with the upper and lower end sections with side plates 8th are covered.

While a refrigerant tank 10 on inlet / outlet side, with which right end portions of the lines 2 are connected at a right end portion of the core 6 is arranged, is a refrigerant tank on the other side 12 , with the left end portions of the lines 2 are connected at a left end portion of the core 6 arranged.

As in 2 and 3 is an inner portion of the refrigerant tank on inlet / outlet side 10 through a partition 14 completely in a refrigerant inlet chamber 16 and a refrigerant outlet chamber 18 divided, which are in a direction of arrangement of the lines 2 that is, a longitudinal direction of the refrigerant tank on inlet / outlet side 10 extends. Meanwhile, an inner section of the refrigerant tank is on the other side 12 further into a refrigerant inlet chamber 24 and a refrigerant outlet chamber 26 through a partition 22 divided, which in the direction of arrangement of the lines 2 that is, a longitudinal direction of the refrigerant tank on the other side 12 extends, and through which a plurality of communication holes 20 are bored.

Further, a refrigerant inlet pipe 28 and a refrigerant outlet pipe 30 with a lower end portion 10a of the refrigerant tank on inlet / outlet side 10 connected. The refrigerant inlet line 28 communicates with the refrigerant inlet chamber 16 , and the refrigerant outlet line 30 communicates with the refrigerant outlet chamber 18 ,

Furthermore, the core exists 6 from a core section 6A on the front side, in which the refrigerant flows after being discharged from the refrigerant inlet pipe 28 the refrigerant inlet chamber 16 of the refrigerant tank on the inlet / outlet side, and a core portion on the return side 6B in which the refrigerant flows after being the refrigerant inlet chamber 24 , the communication holes 20 , and the refrigerant outlet chamber 26 of the refrigerant tank on the other side 12 from the core section on front side 6A happened.

The capacitor 1 which has the above-mentioned configuration uses a so-called countercurrent type in which the refrigerant flows in the horizontal direction sequentially from the core portion 6A the front to the core section 6B the return side flows, creating an effective heat exchange between the air, which is on the core 6 blowing, and the refrigerant passing through the core 6 flows, is allowed.

Here, in the present embodiment, the refrigerant inlet pipe 28 and the refrigerant outlet pipe 30 with the lower end portion 10a of the refrigerant tank on inlet / outlet side 10 as described above, and the lower end portion 10a of the refrigerant tank on inlet / outlet side 10 is under a bottom line 2a from the respective lines 2 arranged. In other words, the refrigerant inlet line 28 and the refrigerant outlet pipe 30 with the refrigerant tank on inlet / outlet side 10 at a position below the core 6 connected.

Furthermore, as in 3 shown, the refrigerant inlet line 28 and the refrigerant outlet pipe 30 with the refrigerant tank on inlet / outlet side 10 at an axisymmetric position with respect to the partition wall 14 as symmetry axis with distances d from the partition wall 14 to conduit centers of the refrigerant inlet line 28 and the refrigerant outlet line 30 , which are almost the same, connected. Furthermore, an inner diameter Do of the refrigerant outlet pipe 30 in advance on an inner diameter Di of the refrigerant inlet line 28 or more.

In the condenser 1 According to the present embodiment, the refrigerant passing through the core 6 flows, by gravity sequentially to the refrigerant tank on inlet / outlet side 10 and to the refrigerant outlet line 30 be guided because the refrigerant outlet 30 with the refrigerant tank on inlet / outlet side 10 at a position below the core 6 connected as described above, whereby an accumulation of liquid refrigerant in a pipe in that the line 2 below the refrigerant outlet pipe 30 is arranged, and a reflux of the liquid refrigerant in the line 2 , be prevented. Therefore, the refrigerant can be caused to flow evenly through all lines 2 whereby unevenness in a refrigerant temperature distribution in a low-temperature region (subcooling region), particularly near the refrigerant discharge pipe in the core portion on the return side, is prevented, eventually causing unevenness in a refrigerant temperature distribution in the entire core 6 is prevented. Accordingly, a fluctuation of a temperature of the blown air at respective air outlets as well as an air outlet at the foot in the HVAC unit can be reduced.

Furthermore, the core 6 be formed so that a high-temperature region (overheating region) near the refrigerant inlet line 28 , which is a relatively high temperature in the core area 6A on the front side, and the low-temperature area (sub-cooling area) near the refrigerant outlet pipe 30 , which is a relatively low temperature in the core area 6B the return side has, completely overlap, since the refrigerant inlet line 28 and the refrigerant outlet pipe 30 with the refrigerant tank on inlet / outlet side 10 at an axisymmetric position with respect to the partition wall 14 are connected as symmetry axis. Therefore, the unevenness in the refrigerant temperature distribution may be caused by a temperature shift by the heat exchange between sensible heat portions of the overheat area in the core portion 6A on the front and the subcooling region in the core section 6B on return side throughout the core 6 be suppressed more effectively. The fluctuation in the temperature of the blown air at respective air outlets in the HVAC unit can be more effectively reduced.

Further, the refrigerant easily flows out of the refrigerant outlet pipe 30 out so that it can cause the refrigerant to flow more evenly into the pipes 2 flows as the inner diameter Do of the refrigerant outlet line 30 equal to or larger than the inner diameter Di of the refrigerant inlet pipe 28 is. Therefore, the unevenness in the refrigerant temperature distribution throughout the core 6 can be effectively suppressed, and the fluctuation in the temperature of the blown air at respective air outlets in the HVAC unit can be reduced more effectively.

The effect will be described in detail with reference to a graph showing a maximum temperature difference ΔTmax (° C) of exhaust air, which is the air after the condenser 1 in relation to an increase in a subcooling degree S. C (deg) in 4 has flown. In the graph, a broken line represents a case of a conventional countercurrent capacitor, which is the core 6 in which the refrigerant is vertical flows, and a solid line represents the case of the present invention. A case in which the capacitor 1 , as in 1 is shown in a state which is rotated clockwise by 90 °, is regarded as a conventional condenser, wherein the refrigerant can not be guided by the use of gravity through the arrangement position of the refrigerant outlet. Therefore, the refrigerant is accumulated or flows back around the refrigerant outlet pipe in the core portion on the return side.

As is clear from the result, in the case of the present embodiment, the maximum temperature difference ΔTmax of the exhaust air can be reduced by about 10 ° C at any value of the supercooling degree SC as compared with the conventional condenser. It will be understood that the unevenness in the refrigerant temperature distribution throughout the core 6 can be effectively suppressed. The present invention should not be limited to the aforementioned embodiment, and various modifications can be made therein.

For example, although in the above-mentioned embodiment, the refrigerant inlet pipe 28 and the refrigerant outlet pipe 30 with the lower end portion 10a of the refrigerant tank on inlet / outlet side 10 are connected, the present invention is not limited to the above-mentioned embodiment, as long as the refrigerant outlet 30 with the refrigerant tank on inlet / outlet side 10 at a position below the core 6 connected is.

More specifically, a capacitor of another embodiment of the present invention is described with reference to FIG 5 to 8th described. 5 FIG. 16 is a front view showing a schematic configuration of a capacitor. FIG 32 schematically represents. 6 is a bottom view of the capacitor 32 in 5 seen from below. 7 is a side view of the capacitor 32 in 5 seen from the right side. 8th is a sectional view of the capacitor 32 in 5 in a direction of BB. Same components as these 1 are assigned the same reference numerals and a description is omitted.

As in 5 to 7 shown has a refrigerant tank on inlet / outlet side 34 of the present embodiment has a greater longitudinal length than the refrigerant tank on the other side 12 , and a side section 34a of the refrigerant tank on inlet / outlet side 34 has a sufficient length to a lower side of the lowest pipe 2a , Therefore, the refrigerant inlet pipe 28 and the refrigerant outlet pipe 30 with a section of the page section 34a of the refrigerant tank on inlet / outlet side 34 under the bottom line 2a connected, ie, connected to the refrigerant tank on inlet / outlet side 34 at a position below the core 6 ,

Furthermore, as in 8th shown, the refrigerant inlet line 28 and the refrigerant outlet pipe 30 with the refrigerant tank on inlet / outlet side 34 at an axisymmetric position with respect to the partition wall 14 as symmetry axis with distances d from the partition wall 14 to the line centers of the refrigerant inlet line 28 and the refrigerant outlet line 30 , which are almost equal, connected. An inner diameter Do of the refrigerant outlet line 30 becomes an inner diameter Di of the refrigerant inlet pipe 30 or more adjusted in advance.

In the condenser 32 In the present embodiment, the accumulation of liquid refrigerant in the conduit 2 and the reflux of the liquid refrigerant in the conduit 2 be prevented because the refrigerant outlet 30 with the refrigerant tank on inlet / outlet side 34 at a position below the core 6 as described above. Furthermore, the unevenness in the refrigerant temperature distribution throughout the core may 6 by the temperature shift by the heat exchange between meaningful heat portions of the overheat area in the core portion 6A on the front and the subcooling region in the core section 6B can be prevented on the return side, and the fluctuation in the temperature of the blown air from the respective air outlets in the HVAC unit can be effectively reduced.

Further, in the aforementioned respective embodiments, the refrigerant inlet pipe 28 and the refrigerant outlet pipe 30 with the refrigerant tank on inlet / outlet side 34 at the axisymmetric position with respect to the partition wall 14 as symmetry axis with distances d from the partition wall 11 to the line centers of the refrigerant inlet line 28 and the refrigerant outlet line 30 , these are almost the same, connected. However, the present invention is not limited thereto, and the refrigerant inlet pipe 28 and the refrigerant outlet pipe 30 can with the refrigerant tank on inlet / outlet side 34 at a point symmetrical position with respect to the partition wall 14 as a symmetry axis, and at a position where they overlap each other when viewed from a direction perpendicular to the partition wall 14 is looked at.

In this case, the distances d from the partition 14 to the line centers of the refrigerant inlet line 28 and the refrigerant outlet line 30 almost equal. The core 6 can be formed so that the overheating area near the refrigerant inlet line 28 , which in the core section 6A on the front side has a relatively high temperature, and the subcooling area near the refrigerant outlet line 30 which has a relatively low temperature in the core section 6B on the reflux side, overlapping each other in at least one section. Therefore, the unevenness in the refrigerant temperature distribution throughout the core 6 by the temperature shift due to the heat exchange between the sensible heat sections of the overheating region in the core section 6A on the front and the subcooling region in the core section 6B be suppressed more effectively on the return side. The fluctuation of the temperature of the blown air in the respective air outlets in the HVAC unit can be effectively reduced.

Furthermore, although the capacitors 1 and 32 , which apply the countercurrent type in which the refrigerant in the horizontal direction sequentially from the core portion on the front 6A to the core section on the reflux side 6B flows described in previous respective embodiments, the capacitor is not limited to the shapes of the capacitors 1 and 32 limited. More specifically, the same effects as described above can of course be achieved even in a countercurrent type capacitor such as the conventional capacitor described in the description of FIG 4 has been assumed, in which the refrigerant flows vertically, by the refrigerant outlet 30 with the refrigerant tank on inlet / outlet side 10 at a position below the core 6 is connected, and by the refrigerant inlet line 28 and the refrigerant outlet pipe 30 with the refrigerant tank on inlet / outlet side 10 at an axisymmetric position with respect to the partition wall 14 be connected as symmetry axis, or at point-symmetrical position with respect to the partition 14 as a symmetry axis, and at a position where both overlap, as viewed from a direction perpendicular to the partition wall 14 ,

LIST OF REFERENCE NUMBERS

1, 32

Condenser (indoor condenser)

2

management

2a

lowest level (line)

4

rib

6

core

6A

Core section on front side

6B

Core section on the reflux side

10, 34

Refrigerant tank on inlet / outlet side

12

Refrigerant tank on the other side

14

partition wall

16

Refrigerant inlet chamber

18

refrigerant outlet

28

Refrigerant inlet line

30

Kältemittelauslassleitung

Claims (3)

An indoor condenser housed in a HVAC unit of a heat pump system of an air conditioner for a vehicle, the indoor condenser comprising: a heat exchange core consisting of stacked pipes and fins; an inlet / outlet side refrigerant tank to which end portions of the pipes are connected; a refrigerant tank on the other side to which the other end portions of the pipes are connected; a partition partitioning an inner portion of the inlet / outlet side refrigerant tank into a refrigerant inlet chamber and a refrigerant outlet chamber; a refrigerant inlet pipe connected to the inlet / outlet side refrigerant tank to communicate with the refrigerant inlet chamber; and a refrigerant outlet pipe connected to the inlet / outlet side refrigerant tank to communicate with the refrigerant discharge chamber, wherein the refrigerant outlet conduit is connected to the inlet / outlet side refrigerant tank at a position below the core. The indoor condenser according to claim 1, wherein the core comprises a core portion on the front side in which a refrigerant undergoes heat exchange after passing through the refrigerant tank on the inlet / outlet side from the refrigerant inlet pipe, and a core portion on the reflux side in which the refrigerant heat exchanges; after having passed the core portion on the front side and the refrigerant tank on the other side, and the refrigerant inlet pipe and the refrigerant outlet pipe with the inlet / outlet side refrigerant tank in a point-symmetrical position with respect to the partition wall as the axis of symmetry, and at a position where they overlap each other as seen from a direction perpendicular to the partition wall. The indoor condenser according to claim 2, wherein the refrigerant inlet pipe and the refrigerant outlet pipe are connected to the inlet / outlet side refrigerant tank in an axisymmetric position with respect to the partition wall as an axis of symmetry.

Images