JPS63153370A - Heat pump type air conditioner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a heat pump air-conditioning device that switches between cooling and heating by switching the flow direction of refrigerant.

[Prior art] For example, a refrigeration system using an accumulator cycle,
The resistance means of the gear pillar tube cap, which also serves as piping from the outdoor heat exchanger to the indoor heat exchanger, is used as a pressure reducing device, but it is used in refrigeration systems where the refrigerant compressor load and usage conditions fluctuate widely, such as in vehicle refrigeration systems. When applied to a device, due to the characteristics of the refrigerant flow6 in the capillary tube, as shown by the broken line a in the graph of Figure 3, the degree of supercooling of the refrigerant (hereinafter referred to as supercool collapse) increases at high rotation speeds such as refrigerant compression. Too much,
There was a problem that an abnormal rise in refrigerant B occurred.

In order to eliminate such problems, conventional pressure reducing devices that change the refrigerant flow rate greatly even with slight changes in the supercool tube have been equipped with a constant differential pressure valve on the -F flow side of the resistance means or an orifice on the downstream side of the resistance means. By providing a fixed diaphragm that undergoes rapid shape changes, it is possible to reduce the temperature within a small range (0°C to 12°C) as shown by the dashed line 1 in the graph of Figure 3.
The refrigerant flow rate can be varied over a wide range (
It is controlled to change at 100/(g/h to 220Kg/h).

[Problems to be Solved by the Invention] However, as shown in FIGS. 12, 13, and 14, when a flow direction switching valve 102 such as a four-way valve or an electromagnetic VJF/A valve is used in the refrigeration system 101, In the case of a heat pump air-conditioning device that switches between cooling operation and heating operation by changing the flow direction of the refrigerant, it is necessary to provide a fixed throttle 104 downstream of the resistance means 103 such as a capillary tube. , it is necessary to bypass the fixed throttle 104 on the upstream side of the resistance means 103 such as a capillary tube, and a plurality of resistance means 103, fixed throttles 104, or chain valves 105 are required, and the refrigerant piping 106 becomes complicated. It had some problems.

The present invention was made in view of the above circumstances, and its purpose is to reduce the number of parts of a pressure reducing device and simplify the refrigerant piping, which cause small changes in supercool suspension and large changes in refrigerant flow rate. The purpose is to provide a heat pump type air conditioning system that can

[Means for Solving the Problems] The heat pump air-conditioning/heating device of the present invention comprises a cooling device in which a refrigerant compressor, an outdoor heat exchanger, a pressure reducing device, and an indoor heat exchanger are sequentially connected in an annular manner; In a heat pump bottom cooling a-cooling device equipped with a flow direction switching means for changing the flow direction of refrigerant in a refrigeration room A to switch between a cooling operation and a cooling operation, the pressure reducing device is equipped with a resistance means and the resistance reducing the passage resistance of the refrigerant when the refrigerant flows from the outdoor heat exchanger side or the indoor heat exchanger side to the resistance means on at least one of the outdoor heat exchanger side or the indoor heat exchanger side of the means; A configuration is adopted in which a reversible throttle valve is provided that increases the passage resistance of the refrigerant when the refrigerant flows from the resistance means to the outdoor heat exchanger side or the indoor heat exchanger side.

[Function 1] The heat pump type air-conditioning device of the present invention having the above configuration has the following function.

When a reversible throttle valve is installed on the outdoor heat exchanger side of the resistance means and the refrigerant flows from the outdoor heat exchanger to the indoor heat exchanger via a pressure reducing device (during cooling), the reversible throttle valve prevents the outdoor heat exchanger from overheating. Since the refrigerant that has reached the cooling state is easily passed through in a completely liquid state, the resistance to the passage of the refrigerant is reduced, and the influence of a decrease in the refrigerant flow rate on the resistance means is reduced.

A reversible throttle valve is provided on the outdoor heat exchanger side of the resistance means, and when the refrigerant flows from the indoor heat exchanger to the outdoor heat exchanger via the pressure reduction device (during heating), the refrigerant is expanded by the resistance means. The passage resistance of the refrigerant increases, and the refrigerant further expands. Therefore, the resistance means and the reversible throttle valve act as a pressure reducing device.

A reversible throttle valve is installed on the indoor heat exchanger side of the resistance means, and when the refrigerant flows from the outdoor heat exchanger to the indoor heat exchanger via the pressure reduction device (during cooling), the reversible throttle valve allows the refrigerant to be expanded by the resistance means. The passage resistance of the refrigerant increases, and the refrigerant further expands. Therefore, the resistance means and the reversible throttle valve act as a pressure reducing device.

When a reversible throttle valve is installed on the indoor heat exchanger side of the resistance means and the refrigerant flows from the indoor heat exchanger to the outdoor heat exchanger via a pressure reducing device (during heating), the reversible throttle valve prevents the indoor heat exchanger from overheating. In order to pass the cooled refrigerant in a completely liquid state, the resistance to passage of the refrigerant is reduced and the cooling Is to the resistance means is reduced.
Reduces the effect of reduced flow rate and allows refrigerant to pass through easily.

[Effects of the Invention] With the above configuration and operation, the heat pump type air-conditioning device of the present invention has the following effects.

b) The check valve that prevents the refrigerant from flowing to the outdoor heat exchanger side through the bypass refrigerant pipe and the bypass refrigerant pipe of the throttle resistance means, which were conventionally used on the outdoor heat exchanger side of the resistance means, is unnecessary. becomes.

O) There is no need for the bypass refrigerant pipe of the throttle resistance means and the check valve that prevents the refrigerant from flowing to the indoor heat exchanger side in the bypass refrigerant pipe, which were conventionally used on the indoor heat exchanger side of the resistance means. Become.

C) Slight change in supercool rate C) Large change in refrigerant flow rate It is possible to reduce the number of parts of the pressure reducing device and simplify the refrigerant piping.

[Example] Next, a heat pump type air-conditioning device of the present invention will be explained based on an example shown in the drawings.

1 to 4 show a first embodiment of a heat pump type air conditioning system according to the present invention, and FIG. 1 shows a schematic diagram of a refrigeration system.

The refrigerant compressor 1 of this refrigeration system tA is intermittently transmitted with the rotation of an engine (not shown) via a clutch, compresses refrigerant sucked through an inlet 11, and discharges the compressed refrigerant from an outlet 12. The refrigerant discharged from the refrigerant compressor 1 flows into the high-pressure side port 21 of the four-way valve 2 via the refrigerant pipe 3.

The four-way valve 2 has an outdoor heat exchanger 31 in addition to the high-pressure side inlet 21.
The first inlet/outlet 22 includes a first inlet/outlet 22 connected to the indoor heat exchanger 32 via the refrigerant piping 3, a second inlet/outlet 23 connected to the indoor heat exchanger 32 via the refrigerant piping 3, and a low pressure side outlet 24.
The connection of the inlet/outlet 23 and the inlet/outlet 23 to the high-pressure side port 21 and the low-pressure side outlet 24 is switched by an electromagnetic switching means (not shown). Further, an accumulator 33 is provided between the low-pressure side outlet 24 of the four-way valve 2 and the suction port 11 of the refrigerant compressor 1.

The outdoor heat exchanger 31 is installed in a place with good ventilation with the outside air, such as the front part of the engine room of the e*, and exchanges heat between the refrigerant and the outside air.

The indoor heat exchanger 32 is disposed in an air conditioner installed in the vehicle interior, and performs heat exchange between air discharged into the vehicle interior and a refrigerant.

Refrigerant piping 3 between outdoor heat exchanger 31 and indoor heat exchanger 32
A capillary tube 34 is provided as a resistance means. On the outdoor heat exchanger 31 side and the indoor heat exchanger 32 side of the capillary tube 34, there are reversible throttle valves 4. which serve as both a throttle resistance means (means for providing passage resistance to the refrigerant) and a one-way valve. 5 is provided. The capillary tube 34 and the reversible throttle valve 4.5 constitute a pressure reducing device that reduces the pressure of the refrigerant and expands it adiabatically.

The reversible throttle valve 4 includes a valve case 40 and a refrigerant passage 41 formed within the valve case 40.

The valve case 40 includes a tube connection part 42 connected to one end of the capillary tube 34, a pipe connection part 43 connected to the refrigerant pipe 3 connected to the outdoor heat exchanger 31, and a pipe connection part between the tube connection part 42 and the pipe connection part. 43, and a bulging portion 44 that bulges in the outer circumferential direction is provided. Note that this bulging portion 44 is formed with a hexagonal portion that engages with a spanner (assembly tool).

The refrigerant passage 41 includes a duplex side refrigerant passage 46 and a throttle 47.
, and a piping side refrigerant passage 49 are provided.

The tube-side refrigerant passage 46 is formed within the tube connection portion 42 and is connected from the capillary tube 34 to the outdoor heat exchanger 31.
It is provided with a gradually decreasing portion 45 whose diameter gradually decreases toward .

The throttle 47 is formed within the bulging portion 44 and reduces the passage resistance of the refrigerant when the refrigerant flows from the outdoor heat exchanger 31 side to the capillary tube 34 . Further, the throttle 47 increases the passage resistance of the refrigerant when the refrigerant flows from the gear roof 34 to the outdoor heat exchanger 31 side. Piping side refrigerant passage 49
is formed within the piping connection portion 43 and includes a gradually increasing portion 48 whose diameter gradually increases from the capillary tube 34 toward the outdoor heat exchanger 31.

Like the reversible throttle valve 4, the reversible throttle valve 5 includes a valve case 50,
A refrigerant passage 51 formed within the valve case 50 is provided.

The valve case 50 includes a tube connection part 52 connected to -QQ of the capillary tube 34, a pipe connection VC part 53 connected to the refrigerant pipe 3 connected to the indoor heat exchanger 32, and a pipe connection part 53 connected to the duplex connection part 52 and the pipe. A bulging portion 54 is provided between the connecting portion 53 and the bulging portion 54 that bulges in the outer circumferential direction. Note that this bulging portion 54 is formed with a hexagonal portion that engages with a spanner (assembly tool).

The refrigerant passage 51 includes a tube side refrigerant passage 56, a throttle 57,
and a piping-side refrigerant passage 59 are provided. The tube-side refrigerant passage 56 is formed within the tube connection portion 52,
A gradually decreasing portion 55 whose diameter gradually decreases from the capillary duplex 34 toward the indoor heat exchanger 32 is provided. The throttle 57 is formed within the bulging portion 54 and reduces the passage resistance of the refrigerant when the refrigerant flows from the indoor heat exchanger 32 side to the cabillary tube 34 . Furthermore, the restrictor 51 greatly increases the passage resistance of the refrigerant when the refrigerant flows from the capillary tube 34 to the indoor heat exchanger 32 side. The piping-side refrigerant passage 59 is formed within the piping connection portion 53 and includes a gradually increasing portion 58 whose diameter gradually increases from the capillary duplex 34 toward the indoor heat exchanger 32 .

In this way, the reversible throttle valve 4.5 has corresponding functional parts having the same structure.

Next, the operation of the refrigerant circuit will be explained.

b) During cooling operation In the four-way valve 2 during cooling operation, as shown in FIG.
and the low pressure side outlet 24 communicate with each other. As a result, the a8iU high-pressure gas phase refrigerant discharged from the discharge port 12 of the refrigerant compression l111 is discharged from the first inlet/outlet port 22 of the four-way valve 2, and the refrigerant follows the refrigerant pipe 3 and flows into the outdoor heat exchanger 31. . The refrigerant flowing into the outdoor heat exchanger 31 exchanges heat with the air outside the vehicle, condenses and liquefies, and roughly becomes supercooled while flowing inside the outdoor heat exchanger 31.

The refrigerant liquefied in the outdoor heat exchanger 31 flows into the pipe-side refrigerant passage 49 in the pipe connection part 43 of the reversible throttle valve 4 . The supercooled refrigerant passes from the piping-side refrigerant passage 49 through the throttle 41 and the duplex-side refrigerant passage 46, and then flows into the capillary tube 34. This aperture 47 has a small resistance to passage of the refrigerant, and the cold temperature to the capillary tube 34 is small.
s Since the diameter is formed to reduce the influence of a decrease in flow rate, the refrigerant can easily pass through in a completely liquid state.

The liquid refrigerant that has flowed into the capillary tube 34 from the dual-side refrigerant passage 46 of the reversible throttle valve 4 is depressurized by flowing through the thin tube, and then flows into the tube-side refrigerant passage 56 within the tube connection portion 52 of the reversible throttle valve 5. do. The refrigerant that has passed through the capillary tube 34 is depressurized and has started to vaporize, so the passage resistance increases and the bulge 54
When passing through the aperture 57 of the
The refrigerant becomes a low-pressure mist and flows into the indoor heat exchanger 32 through the pipe-side refrigerant passage 59 in the pipe connection portion 53 .

The atomized refrigerant that has flowed into the indoor heat exchanger 32 absorbs heat from all the indoor air while flowing through the indoor heat exchanger 32, evaporates, and flows into the accumulator 33.

The refrigerant that has flowed into the accumulator 33 is separated into gaseous refrigerant, liquid refrigerant, and lubricating oil, and a certain amount of the gaseous refrigerant and lubricating oil is compressed into refrigerant I! 11 is inhaled into the suction port 11.

Further, water is removed by a dryer ψ (not shown) inside the accumulator 33.

By repeating the above cycle, the outdoor heat exchanger 3
1 removes heat from the air inside the vehicle, and an indoor heat exchanger 32 discards the heat outside the vehicle to cool the interior of the vehicle.

2) During heating operation In the four-way valve 2 during heating operation, as shown in FIG.
and the low pressure side outlet 24 communicate with each other. As a result, the high temperature, high pressure gas phase refrigerant discharged from the discharge port 12 of the refrigerant compressor 1 is discharged from the second inlet/outlet 23 of the four-way valve 2, and the refrigerant follows the refrigerant pipe 3 and flows into the indoor heat exchanger 32. do. The refrigerant that has flowed into the indoor heat exchanger 532 is deprived of latent heat by the air blown into the vehicle interior, and is condensed and liquefied. The heated air absorbs latent heat from the refrigerant and is blown into the vehicle interior to heat the vehicle interior.

The refrigerant liquefied in the indoor heat exchanger 32 flows into the pipe-side refrigerant passage 59 in the pipe connection portion 53 of the reversible throttle valve 5 . The supercooled refrigerant passes from the piping-side refrigerant passage 59 through the throttle 57 and the duplex-side refrigerant passage 56, and then flows into the capillary tube 34. The aperture 51 has a diameter that has a small resistance to passage of the refrigerant and is formed to reduce the influence of a decrease in the flow rate of the refrigerant to the capillary tube 34.
Refrigerant can easily pass through in a completely liquid state.

The liquid refrigerant flowing into the capillary tube 34 from the duplex side refrigerant passage 56 of the reversible throttle valve 5 is depressurized by flowing through the narrow duplex, and then flows into the tube side refrigerant passage 46 in the tube connection part 42 of the reversible throttle valve 4. do. The refrigerant that has passed through the capillary duplex 34 is depressurized and has started to vaporize, so the passage resistance increases and the bulge 4
When passing through the constrictor 47 of No. 4, the refrigerant is rapidly expanded and becomes a low-temperature, low-pressure atomized refrigerant, which flows into the outdoor heat exchanger 31 through the pipe-side refrigerant passage 49 in the pipe connection part 43.

The atomized refrigerant that has flowed into the outdoor heat exchanger 31 passes through the outdoor heat exchanger 31 as it flows through the outdoor heat exchanger 31,
IJ! It absorbs heat from the outdoor air and evaporates. After the evaporation is completed, the vaporized refrigerant flows into the accumulator 33.

The refrigerant that has flowed into the accumulator 33 is separated into gaseous refrigerant, liquid refrigerant, and lubricating oil, and a certain amount of the gaseous refrigerant and lubricating oil is sucked into the suction port 11 of the refrigerant compressor 1 . Further, moisture is removed by a dryer (not shown) inside the accumulator 33.

By repeating the cycle above, the outdoor heat exchanger 3
1 removes heat from the outside air, and an indoor heat exchanger 32 discards the heat into the vehicle interior to heat the interior of the vehicle.

As shown above, the reversible throttle valves 4.5 each have the functions of both a throttle resistance means and a one-way valve.
f. The devices can be connected in a series loop, making it possible to reduce the number of parts in the pressure reducing device and simplify the refrigerant piping compared to the refrigerant circuit of a conventional heat pump type air-conditioning/heating system with 5A.

Also, by the throttle 47.57 of the reversible throttle valve 4.5, the third
As shown in the graph of the figure, the actual wAC is within a small range (0℃~
Even if the supercool amount changes within 12.7℃), the refrigerant flow rate changes over a wide range (100/h to 22ON5F/h), resulting in load fluctuations in refrigerant compressor 1, large heat load fluctuations in refrigeration equipment A, etc. On the other hand, the two-point chain I! shown in the graph of FIG. The refrigerant flow rate can be reduced to the same level as in a refrigeration system γ equipped with a receiver and an expansion valve as shown in d.

Furthermore, the length 1) and diameter (φ) of the capillary tube 34 are set to J = 1.2 m, φ = 2.8 uk,
The pressure drop characteristics at points B, CSD, and E of this example when the diameter of the throttle 47.57 of the reversible throttle valve 4.5 is varied depending on the diameter of the refrigerant pipe 3 and the cooling rR flow, and the capillary The length and diameter (φ) of the resistance means 103 such as Yub were set to jl = 12 m, φ = 2.8 m, and the diameter (φ) of the fixed aperture 104 was set to φ = 1.2nllll. The pressure drop characteristics at points B, C, D, and E of the conventional pressure reducing device shown in FIG. 12 are shown in FIG. 4. From the graph of FIG. 4, it can be confirmed that the pressure drop characteristics of the pressure reducing device of this embodiment are almost similar to those of the conventional pressure reducing device shown in FIG.

5 to 8 show a second embodiment of the heat pump type air-conditioning device of the present invention.

In this embodiment, the reversible throttle valve 4.5 of the refrigeration system Δ of the first embodiment is replaced with a reversible throttle valve 6.8 having a valve body 7.9. It has been changed. This reversible throttle valve 6 will be explained using FIG. 6. This reversible throttle valve 6 has a valve case 60 that forms a refrigerant flow path.
, a valve body 7 movably disposed within the valve case 60, and a coil spring 61 that urges the valve body 7 toward the side connected to the cavity rib 34.

The valve case 60 includes a duplex side case 62 connected to one end of the capillary tube 34 and a pipe side connection case 63 connected to the refrigerant pipe 3 connected to the outdoor heat exchanger 31.
It consists of This tube side case 62 is provided with a duplex contact MR 64 connected to the capillary duplex 34, and has a cylindrical valve chamber 65 that houses the valve body 7 therein.
Equipped with A step 66 is provided on the tube connection portion 64 side in this valve chamber 65 to stop the movement of the valve body 7 by vA.
A piping side connection case 63 is fastened to a side different from the duplex connection part 64.

The pipe-side connection case 63 includes a pipe connection portion 67 that is connected to the refrigerant pipe 3 and is also provided with a small diameter portion 68 that prevents movement of the valve body within the valve chamber 65 . Inside this small diameter portion 68, a case side taper portion 69 is provided that expands conically toward the valve chamber 65 side.

As shown in FIG. 7, the valve body 7 includes a plurality of projections 11 on the outer periphery of the valve body 1 on the side to which the tube connection portion 64 is connected, which slides into the valve chamber 65. In addition, the piping connection portion 6 of the valve body 7
A valve body side taper portion 72 that narrows conically toward the piping connection portion 67 side is formed at the end portion on the 7 side. Further, a through lower portion 3 is provided in the valve body 7 and penetrates from the tube connection portion 64 side to the piping connection portion 67 side, and the end of the through hole 13 on the piping connection portion 67 side has a sudden shape change. Accompanying nozzle 7
4 has been formed.

Like the reversible throttle valve 6, the reversible throttle valve 8 connected to the indoor heat exchanger 32 side of the capillary duplex 34 is arranged to be movable within the valve case 80 that forms a flow path for the refrigerant. a coil spring 81 that urges the valve body 9 toward the side to which the capillary tube 34 is connected.
Consisting of

The valve case 80 is formed by fastening a tube side case 82 and a piping side connection case 83.
2 includes a duplex connection portion 84 and a valve chamber 85 therein, and a step 86 for preventing movement of the valve body 9 is provided in the valve chamber 85. In addition, the piping side connection case 83
is provided with a pipe connection portion 87 and a case side tapered portion 88 that prevents movement of the valve body 9 within the valve chamber 85.

The valve body 9 includes a plurality of protrusions 91 that slide into the valve chamber 85, and is provided with a valve body side j-bar portion 92 at the end thereof. Roughly inside the valve body 9, a through hole 93 is provided, and a nozzle 94 is formed at the end thereof.

Next, the operation of the refrigerant circuit of the second embodiment will be explained.

(A description of the same operation as in the first embodiment will be omitted.) During the in-cooling operation, the refrigerant liquefied in the outdoor heat exchanger 31 flows into the reversible throttle valve 6 through the piping connection 67. The valve body 7 is urged toward the tube connection portion 64 by the coil spring 61 and the flow of liquid refrigerant, and the protrusion 71 comes into contact with the step 66 . As a result, the space between the case side taper part 69 and the valve body side taper part 72 is opened, and the refrigerant flows into the valve chamber 65 between the valve case 60 and the valve body 7 . For this reason, the valve chamber 65
The refrigerant that has flowed into the tube passes between the projections 71 and flows into the capillary duplex 34 from the tube connection portion 64 .

Further, a part of the refrigerant that has flowed in from the pipe connection portion 67 passes through the nozzle 74 and the through lower portion 3 and flows into the capillary tube 34 from the duplex connection portion 64 .

The liquid refrigerant that has flowed into the cavity 1-734 is reduced in pressure by flowing through the thin capillary tube 34, and then flows into the interior through the duplex connection 84 of the reversible throttle valve 8. Since the refrigerant that has passed through the capillary tube 34 is depressurized and vaporization has started, the passage resistance increases.
The valve body 9 is urged toward the piping connection portion 81 by overcoming the urging force of the coil spring 81. Therefore, the case side taper part 88 and the valve body side taper part 92 come into contact with each other, and the refrigerant is prevented from passing between the case side taper part 88 and the valve body side taper part 92. The refrigerant that has flowed into the duplex connection portion 84 flows into the refrigerant pipe 3 from the pipe connection portion 81 only through the n-port 93 and the nozzle 94 . Piping connection part 8
When the refrigerant flowing into the refrigerant pipe 3 from 7 passes through the nozzle 94, it is rapidly expanded, becomes a low-temperature, low-pressure mist refrigerant, and flows into the outdoor heat exchanger 31.

(1) During heating operation, the refrigerant liquefied in the indoor heat exchanger 32 flows into the reversible throttle valve 8 through the pipe connection portion 81 thereof.

The valve body 9 is urged toward the duplex connection portion 84 by the coil spring 81 and the flow of liquid refrigerant, and the protrusion 91 comes into contact with the step 86 . As a result, the case side taper part 8
8 and the valve body side taper portion 92 are opened, and the refrigerant flows into the valve case 80 and the 1 m valve chamber 85 of the valve body 9. Therefore, the refrigerant that has flowed into the valve '[85] passes between each of the protrusions 91 and is transferred from the goose 1-beam connection 84 to the main 11 villa ridge l-
The water flows into the pipe 34. Further, a part of the refrigerant that has flowed in from the pipe connection portion 87 passes through the nozzle 94 and the through hole 93 and flows into the capillary tube 34 from the duplex connection portion 84 .

The liquid refrigerant that has flowed into the capillary tube 34 is depressurized by flowing through the narrow duplex, and then passes through the reversible throttle valve 6.
Flows into the interior through the duplex connection portion 64 of. Since the refrigerant that has passed through the capillary tube 34 is depressurized and vaporization has started, the passage resistance increases, and the valve body 7 is urged toward the piping connection portion 67 by overcoming the urging force of the coil spring 61. Therefore, the case side taper part 69 and the valve body side taper part 72 come into contact with each other, and passage of the refrigerant between the case side taper part 69 and the valve body side taper part 72 is blocked. The refrigerant that has flowed into the duplex connection portion 64 flows through the pipe connection portion 67 only through the through lower portion 3 and the nozzle 74.
The refrigerant flows into the refrigerant pipe 3. When the refrigerant flowing into the refrigerant pipe 3 from the pipe connection part 61 passes through the nozzle 74, it is rapidly expanded, becomes a low-temperature, low-pressure mist refrigerant, and flows into the outdoor heat exchanger 31.

Since the reversible throttle valve 6.8 of this embodiment has the valve body 1.9 numbered, it is possible to set a larger difference in refrigerant passage resistance during cooling and heating than in the first embodiment.

In this embodiment, the reversible throttle valves 6.8 are arranged to face each other, but the reversible throttle valves 6.8 may be arranged facing in the same direction. In this case, the same operation as in the first embodiment occurs during heating or cooling operation.

FIG. 9 shows a reversible throttle valve 6 adopted in a third embodiment of the present invention.

(The same reference numerals as in the second embodiment indicate the same functional parts.) In this embodiment, the nozzle 74 in the valve body 7 of the above embodiment is abolished, and one or more fillers are provided in the case side taper part 69. As shown in the figure, when the valve body 7 is urged toward the piping connection part 67 side by the refrigerant and the case side taper part 69 and the valve body side taper part 72 come into contact, the inner surface of the full 76 is closed by the valve body side taper portion 72 to form a nozzle.

As a result, the refrigerant flowing from the tube connection part 64 is
It expands after passing 16 minutes. Note that the groove 76 may be provided in the tapered portion 72 on the body side, or this embodiment may be applied to the reversible throttle valve 8 side.

10 and 11 show a reversible throttle valve 6 adopted in a fourth embodiment of the present invention.

(The same reference numerals as in the second embodiment indicate the same functional objects.) The valve body 7 of this embodiment is a thin plate made of resin, leaf spring, etc., and has an orifice 17 in the center and a plurality of cutouts 18 on the outer periphery. . Further, the coil spring 61 has a type C that urges the valve body 7 toward the piping connection portion 67 side.

When the refrigerant flows from the tube connection part 64 side, the valve body 7 is biased toward the pipe connection part 67 side, and the refrigerant can flow into the pipe connection part 67 side only through the orifice 71. It expands as it passes through.

Moreover, when the refrigerant flows in from the pipe connection part 67 side, the valve body 1 is moved to the tube connection part 64 side by the pressure of the refrigerant. This opens the gap between the valve body 7 and the small diameter portion 68, and the refrigerant flows into the valve chamber 65 through the gap and the notch 78, and is discharged from the tube connection portion 64 side. This results in
The refrigerant flowing in from the pipe connection part 67 side flows out from the tube connection part 64 side without being subjected to large passage resistance.

(Modification) In this embodiment, a capillary tube is used as the resistance means, but a constant differential pressure valve, an orifice, etc. may also be used.

In this embodiment, a nozzle and an orifice are used as means for imparting passage resistance to the refrigerant, but a restricting resistance means that undergoes rapid shape changes, such as a venturi, may also be used.

In this example, reversible throttling valves were provided on both sides of the outdoor heat exchanger side and the indoor heat exchanger side of the resistance means, but they were used only on one side, and the other was used in combination with the throttling resistance means and a one-way valve. Also good.

In this example, a four-way valve was used as the flow direction switching means.
The flow direction of the refrigerant may be switched using a plurality of electromagnetic valves.

[Brief explanation of the drawing]

Fig. 1 is a refrigerant circuit diagram of the heat pump air-conditioning system adopted in the first embodiment of the present invention, not showing the cooling operation, and Fig. 2 is a heating operation of the heat pump air-conditioning system adopted in the first embodiment of the present invention. The refrigerant circuit diagram showing the time, FIG. 3 is the first embodiment of the present invention.
Heat pump type cooling/heating F adopted in the embodiment: A graph showing the relationship between the refrigerant flow rate of the device and super cooling. Figure 4 shows the predetermined refrigerant piping with respect to the diameter of the reversible throttle valve adopted in the first embodiment of the present invention. FIG. 5 is a graph showing the relationship between the pressure drop and the pressure drop when the temperature is small. FIG.
The figure is a sectional view of the reversible throttle valve adopted in the second embodiment of the present invention, FIG. 7 is a perspective view of the valve body of the reversible throttle valve adopted in the second embodiment of the present invention, and FIG. A refrigerant circuit diagram during heating operation of the heat pump air-conditioning system adopted in the second embodiment, FIG. 9 is a sectional view showing a reversible throttle valve adopted in the third embodiment of the present invention, and FIG. 10 is a diagram of the present invention. 11 is a perspective view of the valve body of the reversible throttle valve adopted in the fourth embodiment of the present invention shown in FIG. 10, and FIGS. FIG. 14 is a refrigerant circuit diagram showing a conventional heat pump air-conditioning system during cooling operation. In the figure, A: Refrigeration system H1: Refrigerant compressor 2: Four-way valve 31: Outdoor heat exchanger 32: Outdoor heat exchanger 33
...Accumulator 34...Capillary tube (resistance means) 4.5.6.8...Reversible throttle valve
60.80...Valve case 7.9...Valve body 74.
94...Nozzle Figure 9 Figure 4 ED CB Figure 6 Figure 7 Figure 1o Figure 11

Claims (1)

[Claims] 1) A refrigeration system in which a refrigerant compressor, an outdoor heat exchanger, a pressure reduction device, and an indoor heat exchanger are sequentially connected in a ring, and a cooling operation by changing the flow direction of the refrigerant in the refrigeration system. In a heat pump type air-conditioning device equipped with a flow direction switching means for switching between a heating operation and a heating operation, the pressure reducing device includes a resistance means, and at least one of the resistance means on the outdoor heat exchanger side or the indoor heat exchanger side. When the refrigerant flows from the outdoor heat exchanger side or the indoor heat exchanger side to the resistance means, the passage resistance of the refrigerant is reduced, and the refrigerant flows from the resistance means to the outdoor heat exchanger side or the indoor heat exchanger side. A heat pump type air-conditioning/heating device characterized by being provided with a reversible throttle valve that increases the passage resistance of refrigerant when it flows to the side. 2) The reversible throttle valve has a valve case and a valve body disposed within the valve case and movable by being energized by the flow of refrigerant, and the valve body is connected to the outdoor heat exchanger inside the valve case. The refrigerant passage resistance is increased when the valve body moves to the chamber side or the indoor heat exchanger side, and the refrigerant passage resistance is decreased when the valve body moves to the resistance means side within the valve case. A heat pump air-conditioning device according to claim 1. 3) The heat pump according to claim 1 or 2, wherein the refrigeration system is an accumulator cycle that includes an accumulator on the refrigerant suction side of a refrigerant compressor. type air conditioning system.