JPS61115709A - Air conditioner for automobile - Google Patents

Abstract

PURPOSE:To make temperature in hot air and cold blast larger and low noise and low-pressure loss promotable, by making a suction type air conditioner so as to ventilate a car room in a state of having the hot air and the cold blast separated by a blower case with a built-in guide which has a notch at the upstream side. CONSTITUTION:A scroll part 3A of a blower case 3 is divided into the inside and the outside with a plastic guide 40. An end part 40a at the upstream side of this guide is situated in a position being dislocated as far as just 180 deg. from that of a nose 3C of the scroll, and a V-shaped notch 40c is installed there. Length of this notch 40c is set to half of length l of the guide 40. With this constitution, if a part of hot air and cold blast being led into the inside of the blower case 3 is mixed each other, most of them are guided as being left divided intact, and when a supply opening select damper 22 comes to 22b with a by-level mode, the hot air is led into a down blast passage 23 while the cold blast into an outlet 20 respectively so that a temperature difference is made enough distinguishable to the blowoff temperature, thus comfortable temperature distribution, say, keeping the head cool and the feet warm, is securable.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an air conditioner for an automobile, and particularly relates to an improvement of an air conditioner for an automobile having a suction type air blower provided downstream of an evaporator and a heater core. .

[Conventional technology]

The conventionally well-known air mix type automotive air conditioner guides warm air heated by a heater core and cold air cooled by a refrigerant evaporator in the refrigeration cycle to an air mix chamber, where the cool and warm air is mixed and heated by the heater. ,Bento,
It is configured so that air is blown out from each outlet such as a differential. In this air conditioner, during the intermediate seasons between spring and autumn, warm air is blown from the heater outlet toward the occupant's feet, and at the same time, cold air is blown from the vent outlet toward the occupant's head. A level mode is provided. In this case, the air blower of the air conditioner often uses a push-in type blower installed upstream of the heater core and evaporator. Jitsukō 54-3147'
Various improvements have been made, such as providing an air guide in the air mix chamber as shown in No. 1, and bypassing cold air.

On the other hand, there are also known suction type blower devices installed downstream of the evaporator and heater core. This suction-type air blower has an advantage over the push-in type in that uniform heat exchange can be achieved in heat exchanger portions such as the heater core and the evaporator. Particularly in recent years, there has been a demand for higher-grade automotive air conditioners, and various efforts are being made to achieve uniform heat exchange. It is valid.

In addition, in order to satisfy the recent demand for installing air conditioners in light vehicles, etc., there is a sufficient need for space saving. In this respect, suction type blowers do not require an air mix chamber compared to push type blowers, so
It is very concise and effective. However, most of the air conditioners devised at present (+) employ push-in type blowers, and there are few suction type blowers, and in particular, the /-, J level mode has not been studied.
) power.

Therefore, the present applicant filed Japanese Patent Application No. 59-53964.
As shown in issue ', we proposed a suction type automotive air conditioner that is capable of pie level mode.

[Problem that the invention seeks to solve]

The present invention was made to further improve the above-mentioned Japanese Patent Application No. 59-53964, and more specifically, to increase the temperature difference between hot air and cold air in the pie level mode.

Therefore, in order to obtain the above-mentioned temperature difference, the present inventors considered and researched the idea of providing a guide along the scroll part in a professional case that has a scroll part, and using this guide to divide the scroll part into hot air and cold air. I did it.

However, simply providing a guide within the scroll portion not only does not provide a sufficient temperature difference, but also generates vortices within the scroll portion, which increases noise. Additionally, there is a problem in that pressure loss within the scroll portion increases and air volume decreases.

[Means for solving problems]

Therefore, in order to solve the above problems, the present invention provides a duct provided with an air inlet on the windward side and a cold air outlet and a hot air outlet on the leeward side, and a refrigerant for the refrigeration cycle disposed inside the duct. an evaporator that cools the surrounding air by evaporating it; a heater core that is disposed within the duct and uses the cooling water of the automobile engine as a heat source to heat the surrounding air; a blower case having a scroll portion; a guide provided to divide the inside of the blower case into an inside portion and an outside portion along the scroll shape and having a notch formed at an air upstream end; a centrifugal fan housed in the blower case, and a centrifugal fan installed in the duct on the windward side of the air suction port of the blower case, which separates the cold air cooled by the evaporator and the warm air heated by the heater core, thereby generating the blower. a temperature control damper that is caused to be sucked into the air suction port of the case; and a temperature control damper that is provided in the duct on the leeward side of the air discharge port of the blower case and that changes the ratio of hot air and cold air discharged from the air discharge port; A technical means is adopted in which a blower outlet switching damper is provided to introduce cold air into the cold air outlet and hot air into the hot air outlet.

[Effect]

By adopting the above technical means, the cold air cooled by the evaporator and the hot air cooled by the heater core are separately introduced into the professional case by the temperature control damper. The hot air and cold air introduced into the blower case are partially mixed by the centrifugal fan, but are split into hot air and cold air along the scroll shape by a guide with a notch formed on the upstream end. Discharged from the blower case. In this case, since a notch is formed at the air upstream end of the guide, division of cold air and hot air is promoted, and noise and pressure loss in the scroll portion can be kept extremely low.

Hot air and cold air discharged from the blower case with a suitable temperature difference are distributed to a cold air outlet and a hot air outlet by an outlet switching damper.

〔Effect of the invention〕

Therefore, according to the present invention, in the suction type automobile air conditioner, it is possible to increase the temperature difference between cold air and hot air in the pie level mode, and the upper part of the vehicle interior is
By blowing out low-temperature air and blowing out high-temperature air into the lower part of the vehicle interior, a comfortable temperature distribution can be obtained that keeps the head cold and the feet warm.

Moreover, according to the present invention, since the centrifugal fins are provided downstream of the evaporator and heater core, cooling and heating are performed uniformly in the evaporator and heater core, allowing efficient heat exchange. .

〔Example〕

The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 1 shows a state in which an air conditioning unit 1 to which the present invention is applied is arranged in a vehicle interior, and the space unit 1 is arranged in a space inside a driver's seat instrument panel 15 from the passenger seat to the center of the front seat. . This air conditioning unit 1 consists of an air conditioning case 2 made of insulating resin that houses a heat exchanger inside, and a blower case 3 made of insulating resin that houses a fan that sends the air that has been heat exchanged in the case 2 into the passenger compartment. The air conditioning case 2 and the blower case form a duct of this air conditioner. In FIG. 1, reference numeral 6 indicates an outside air inlet for introducing outside air into the air conditioning case 2, and reference numeral 7 indicates an inside air inlet for introducing air from the inside of the vehicle into the air conditioning case 2.

2 and 3 show the internal configuration of the air conditioning unit 1. The inside of the air conditioning case 2 is divided into upper and lower two stages, an upper air passage 2a and a lower air passage 2b, with a partition wall 2C in between. A heater core 4 whose heat source is the cooling water of an automobile engine is disposed in the passage 2a, and an evaporator 5 of a refrigeration cycle is disposed in the lower passage 2b. In this case, the heater core 4 and the evaporator 5 are installed in their respective air passages at an angle of about 15 degrees with respect to the horizontal direction, as shown in FIGS. 2 and 3. Therefore, for example, it is possible to increase the longitudinal dimension ffi of the evaporator 5 and shorten the width dimension 12, and the width dimension (depth dimension) of the air conditioning case 2 can be greatly reduced. Further, by arranging the heater core 4 and the evaporator 5 at an angle, the height dimension of the air conditioning case 2 can be reduced compared to the case where both are arranged vertically.

A lower passage 2 is provided on the upstream side of the heater core 4 in the upper air passage 2a.
A communication hole 2d is provided on the upstream side of the evaporator 5 of b. Further, an outside air inlet 6 for introducing air outside the vehicle into the air conditioning case 2 is opened on the upper surface of the air conditioning case on the upstream side of the heater core 4 . An inside air introduction lower is opened in the side surface of the air conditioning case 2 adjacent to the outside air introduction port 6. The inside air introduction lower and the outside air introduction port 6 are connected to the upper air passage 2.
It is switched open and closed by an inside/outside air switching damper 8 rotatably attached to a.

A distribution chamber 2e is provided downstream of the upper passage 2a and the lower passage 2b to distribute and introduce the wind from the respective air passages into the blower case 3.

This distribution chamber 2e has air discharge ports 2a-
1 and the air outlet 2b-1 of the lower air passage 2b to adjust the temperature by changing the proportion of air discharged from the air outlet 2b-1 of the lower air passage 2b.
is rotatably mounted.

The blower case 3 is connected to the distribution chamber 2e of the air conditioning case 2 configured as described above. The blower case 3 is formed in a scroll shape (spiral shape), and a sirocco type fan 10 is disposed at the end of the scroll portion 3, and a motor 1) for driving the fan 10 is attached to the blower case 3. Therefore, as the fan 10 rotates, air in the distribution chamber 2e is sucked into the blower case 3 through the blower suction port 3a, and is blown out downstream from the discharge port 3b.

Here, the positional relationship between the blower suction port 3a and the temperature adjustment damper 9 will be explained in detail. Figure 4 shows blower case 3.
3 is a schematic diagram showing a cross section of FIG. 3, and the reference numeral in the figure indicates the position of the tip of the temperature adjustment damper 9 when the temperature adjustment damper 9 is at the position 9a (bar level position) in FIG. 3. In other words,
Narrowest air passage portion 3C (nose) of blower case 3
The blower case 3 and the air conditioning case 2 are connected such that the tip of the temperature control damper 9 is located on a straight line connecting the blower center axis 3d and the blower center axis 3d.

Further, as shown in FIG. 4, a resin guide 40 is integrally molded with the blower case 3 so as to divide the scroll portion 3A into an inner portion and an outer portion of the blower case 3.

The degree of curvature of this guide 40 is equivalent to that of a scroll as shown in FIG.
is exactly 180° shifted from the position of the scroll nose 3c, that is, at the extended position of the fourth figure. On the other hand, the distance 3f between the upstream end 40b and the suction port 3a is approximately equal to the distance 3g between the nose 3C and the suction port 3a to prevent sudden changes in pressure.

Furthermore, in order to prevent sudden pressure release on the upstream end side of the guide 40, the upstream end side of the guide 40 is provided with
As shown in the figure, a V-shaped notch is provided. If the length of the guide 40 is 2, this notch 40C extends from the upstream end 40a toward the downstream end. It is formed with a length of /2.

Therefore, among the air divided by the temperature control damper 9, the warm air C is sucked into the professional case 3 from the oblique part 3a1 of the suction port 3a, and passes through the inner side 3A1 of the guide 40 to the guide 4.
The air is ventilated along the direction 0 and is discharged from the discharge port 3b. On the other hand, the cold air B is sucked into the blower case 3 from a portion of the suction port 3a indicated by the reference numeral 3a2 in FIG. 4, is ventilated along the outside 3A2 of the guide 40, and is discharged from the discharge port 3b. In this way, the hot air and cold air are divided by the guide 40, resulting in a large pressure loss.

FIG. 7 shows the specific structure of the blower case 3. On the downstream side of the air outlet 3b, there is an outlet switch that distributes cold air B and warm air C to a cooling outlet 20 and a hot air outlet 21, respectively. A damper 22 is rotatably provided between the outlet ports 20.21. The cold air outlet 20 is provided in the instrument panel 15 in the vehicle interior by a duct (not shown), and is connected to vent outlets 15a, 15b, 15 that blows cold air toward the chest of the occupant.
Connected to C.

On the other hand, on the downstream side of the hot air outlet 21, a lower air passage 23 is formed so as to be separated from the scroll portion 3A in which the fan 10 is housed by an inner wall 3e. In other words, the scroll portion 3A and the lower air passage 23 have a two-part structure that is integrally molded, and are divided in the vertical direction in FIG. 5. Therefore, after the fan 10 is housed in the scroll portion 3A, the blower case 3 is fixed at a plurality of locations with leaf springs 24.

A defroster outlet 25 is opened in the middle of the lower air passage 23, and the defroster outlet 25 blows warm air toward the windshield of the automobile through a duct (not shown). On the leeward side of the defroster outlet 25, a heater outlet that blows out warm air toward the feet of the occupant is opened, and in the lower air passage 23, the defroster outlet 25 and the heater outlet 26, 27 are opened. A defroster damper 28 is rotatably provided to open and close the defroster damper.

FIG. 9 shows the air conditioning control panel 33, which is located on or near the instrument panel 15, at a position that is easier to operate than the driver's seat.

Reference numeral 50 indicates a push-button knob for a compressor operation switch of the refrigeration cycle, and reference numeral 51 indicates a rotary knob for a speed side fl switch of the blower motor 1), each of which is provided on the panel 33 so as to be manually operable.

34 is a blowout mode setting member, and the horizontal groove 33a of the panel 33
It consists of a lever 34a that is movable inside the lever 34a, and a knob 34b attached to the tip of the lever 34a. 22.
28 are connected.

Reference numeral 35 denotes a temperature setting member that is movable within the panel mechanism 33b (a provided lever 35a,
The temperature adjusting damper 9 is connected to the lever 35a via a suitable link mechanism, control wire, etc.

When the lever 35a is operated all at once to the C00L side, the temperature control damper 9 is switched to the position 9b in FIG.
When 5a is operated all at once on the HOT side, the temperature control damper 9 is switched to the 90 position shown in Fig. 3, and C, OOL and HOT
In the intermediate position, the temperature regulating damper 9 is switched to the position 9a in FIG.

Reference numeral 36 denotes an inside/outside air switching member, which is composed of a lever 36'a provided so as to be movable within the horizontal groove 33c of the panel 33, and a knob 36b attached to the tip of this lever 36a. The inside/outside air switching damper 8 is connected to the inside/outside air switching damper 8 via a suitable link mechanism, control wire, etc.

Next, the operation of this embodiment in the above configuration will be explained. The operation will be explained for each blowout mode.

(1) Cooler vent (VENT) mode Adjust the knob 34b of the blowout mode setting member 34 to V, E N in FIG.
When operated to position T, the outlet switching damper 22 is switched to the position 223 in FIG. 7, fully opening the cold air outlet 20 and closing the hot air outlet 21.

Therefore, when the blower motor 1) is operated by the knob 51 of the blower control switch, the introduced air is cooled by the evaporator 5, passes through the cold air outlet 20, and is blown out from the vent outlet into the vehicle interior.

The temperature can be controlled by operating the temperature adjustment damper 9 using the temperature setting member 35 and changing the air volume ratio between the upper air passage 2a on the heater core 4 side and the lower air passage 2b on the evaporator 5. Vent outlet 15 for hot air and cold air
a, 15bS The mixture is sufficiently mixed before being blown out from 15c.

(2) High level health (BI-BEvEL) mode When the knob 34b of the blowout mode setting member 34 is operated to the B/L position, the blowout outlet switching damper 22 is switched to the position 22b in FIG. 7, and the defroster damper 28 is , switch to the position 28a in the figure. Therefore, the vent outlets 15a, 15b, 1
Air is blown into the vehicle interior from both heater outlets 26 and 27.

In this case, the cold air cooled by the evaporator 5 and the hot air heated by the heater core 4 are divided into hot air and cold air if the temperature control damper 9 is at the intermediate position 9a as shown in FIG. Even when the air is sucked into the blower case 3 and blown out from the blower case outlet 3b, the air is separated into hot air and cold air as shown in FIG. As shown in FIG. 7, at the intermediate position 22b, the cold air and hot air are divided at a ratio of 3:2, and the warm air is introduced into the lower air passage 23, and the cold air is introduced into the cold air outlet 20. Therefore, by mainly directing the cold air to the vent outlets 15a, 15b, and 15c, and by mainly directing the warm air to the heater outlet air temperature, a comfortable temperature distribution for keeping the head cold and feet warm can be obtained. Note that the temperature difference at pie level can be arbitrarily selected depending on the degree of opening and closing of the temperature control damper 9.

(3) Heating (HEAT) mode Knob 34 of blowout mode setting member 34 b'tcHEAT
When operated to the position, the outlet switching damper 22 is switched to the position 22c in FIG. 7, and the cold air outlet 20 is closed. Warm air is introduced into the lower air passage 23 from the hot air outlet 21, and since the defroster damper 28 is in the state 28a, warm air is blown out from the defroster outlet and the heater outlet 26,27.

(4) Defroster (DEF) mode When the knob 34b of the blowout mode setting member 34 is set to the DEF position, the blowout outlet switching damper 22 is moved to the position 22a in FIG.
In this position, the cold air outlet 20 is closed and the defroster outlet 28 is switched to the position 28b. Therefore, warm air is blown out toward the windshield only from the defroster outlet.

In addition, in the operation in each of the above-mentioned modes, the heater core 4 and the evaporator 5 are arranged at an angle, but the fan 10, which is an air blower, is a suction-type fan 10 arranged downstream of the heat exchanger 4.5. Therefore, the air that undergoes heat exchange in the heater core 4 and the evaporator 5 is blown with good and uniform heat exchange, and the air-conditioned feeling is not impaired.

Next, other embodiments of the present invention will be described.

Here, the effect of the guide 40 having the ■-shaped notch 40c will be explained.

Is the air volume at the discharge port 3b of the blower case 3 29°n? /h
When the temperature of the hot air taken in from the inlet 3a is 80°C and the temperature of the cold air is 23°C, the temperature distribution at the outlet 3b is as shown in FIG. 8, which is a sectional view taken along line E-E in FIG. 7. It becomes as shown in . That is, FIG. 8 divides the outer space 3A2 and inner space 3A+ of the guide 40 into eight blocks, respectively, and shows the results of measuring the temperature of each block.

Note that the numbers in each block indicate the temperature (unit: °C).

In addition, the average temperature TI of each measured temperature of the inner space 3A+ is
T+-57.4℃, the average temperature T2 of each measurement temperature of outer space 3 A2 is T2=33.2℃, and inner space 3
The average temperature difference ΔT between A1 and the outer space 3A2 is as follows: ΔT=ΔTl−ΔT2=24.2°C.

That is, according to this embodiment, the temperature difference between cold air and warm air is 2.
4.2°C is obtained. Therefore, in the pie level mode, it is possible to make a sufficient difference in the temperature of the blown air in the vertical direction.

Moreover, according to this embodiment, since the notch 40a is provided, the air volume at the outlet 3b when the guide 40 is not provided is 304n? /h, even if the guide 40 is attached, the air volume decreases by only 14n (/h), and it was confirmed that the pressure loss is small.

Additionally, since pressure loss is small, noise is also kept low.

As mentioned above, if the guide 40 of the scroll portion 3A in a suction type blower is canted in a V-shape, the air volume will be reduced.
The pie level mode that suppresses noise as much as possible is possible, but as shown in FIG. 10 and FIG. It may extend up to 3 and be cut diagonally. In addition, in Figure 10.1), the bottom side is the suction port 3.
Be on the a side. In this case, as above, hot air is 80℃, cold air is 2
When 3°C is inhaled, the temperature distribution at the outlet is as shown in Figure 12. That is, in this case space 3 A +
The difference between the average temperature of each measured temperature and the average temperature of each measured temperature of outer space 3 A 2 is ΔT=21.9°C. Further, the air flow rate decrease in this case is about 20 rri'/h. As described above, according to this example, the ■-shaped notch 40a
Although the performance is slightly inferior to that of a guide with a guide, a temperature difference between hot air and cold air (about 22°C) can be obtained.

Furthermore, the present invention is applicable without being limited to arranging the evaporator 5 and heater core 4 in parallel in the air conditioning case 2 as in the above-described embodiments.

FIG. 13 shows an embodiment applicable to an air conditioner in which an evaporator 5 and a heater core 4 are arranged in series in a duct 100, and a temperature control damper 90 is arranged downstream of the evaporator 5 and upstream of the heater core 4. A bypass path 100a is provided on the side of the heater core 4 by a partition wall 101, and a bypass path 100a is provided downstream of the heater core 4.
00b. The downstream end of this partition wall 101 is provided to extend to the air intake port 3a of the blower case 3.

Therefore, the air cooled by the evaporator 5 is divided into two types: one is introduced into the bypass passage 100a, and the other is reheated by the heater core 4, depending on the degree of opening of the temperature control damper 90. Therefore, the cold air in the bypass passage 100a and the warm air in the heater core downstream passage 100b are drawn into the blower case 3 in a divided state.

[Brief explanation of the drawing]

The drawings all show embodiments of the present invention, with Fig. 1 being a perspective view showing the air conditioning unit installed in the vehicle interior, Fig. 2 being a perspective view of the air conditioning case, and Fig. 3 showing the internal configuration of the air conditioning system. 4 is a schematic diagram showing how the guide is arranged inside the blower case, FIGS. 5 and 6 are top and side views of the guide, and FIG. 7 is a plan view of the blower case. Figure 8 is a sectional view taken along line E-E in Figure 7 showing the temperature distribution inside the blower case, Figure 9 is a perspective view of the operation panel of the air conditioner, and Figures 10 and 1) show other examples of the guide. FIG. 12 is a sectional view taken along line EE in FIG. 7 showing the temperature distribution inside the blower case of another embodiment, and FIG. 13 is a schematic sectional view of the air conditioner of another embodiment. 1... Air conditioning unit, 2... Air conditioning case, 3...
Blower case, 3a...intake port, 3b...outlet,
3A...Scroll part, 4...Heater core, 5...
・M to N, 6...Outside air inlet, 7...Inside air inlet,
9...Temperature control damper, 10...Centrifugal fan, 1)
...Motor, 2o...Cold air outlet, 21...Warm air outlet, 22...Blower outlet switching damper, 40...Guide, 40c...Notch.

Claims (3)

[Claims] (1) A duct with an air inlet on the windward side and a cold air outlet and a hot air outlet on the leeward side, and an evaporator installed in this duct to evaporate the refrigerant of the refrigeration cycle and cool the surrounding air. a heater core that is disposed in the duct and heats the surrounding air using the cooling water of the automobile engine as a heat source; and a blower case having a scroll portion formed in the middle of the duct on the leeward side of the evaporator and the heater core; a guide provided so as to divide the inside of the blower case into an inside and an outside along the scroll shape and having a notch formed at an air upstream end; a centrifugal fan housed in the blower case; Temperature control provided in the duct on the windward side of the air suction port of the case, and for dividing the cold air cooled by the evaporator and the warm air heated by the heater core and sucking it into the air suction port of the blower case. a damper, which is provided in the duct on the leeward side of the air discharge port of the blower case, and changes the ratio of hot air and cold air discharged from the air discharge port, and directs cold air to the cold air outlet; An air conditioner for an automobile, comprising: an outlet switching damper that introduces warm air into an outlet. (2) The air conditioner for an automobile according to claim 1, wherein the notch of the guide is formed in a V-shape. (3) The automobile air conditioner according to claim 1, wherein the notch of the guide is formed obliquely from the inside to the outside of the scroll portion.