JPS63226567A - 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 (Field of Industrial Application) The present invention includes one outdoor unit and a plurality of indoor units. The present invention relates to so-called multi-type air conditioners, and particularly relates to improvements in refrigerant branch pipes for multiple indoor units and measures to shorten refrigerant pipe lengths.

<Prior Art> Conventionally, as this type of multi-model air conditioner, for example, as disclosed in Japanese Utility Model Application Publication No. 50-91165, refrigerant branch pipes are arranged in one outdoor unit, and the A main flow port and a plurality of branch flow ports are formed in the refrigerant branch pipe to form a header, and the main flow port is connected to the refrigerant piping in the outdoor unit, and the plurality of branch flow ports are connected to the refrigerant pipes in the indoor unit. By connecting a plurality of indoor units through a plurality of refrigerant pipes corresponding to the number of units, and providing the indoor units 1 in parallel with each other and allowing the refrigerant to flow to the outdoor unit. It is known that a single outdoor unit is shared and each outdoor unit is used to effectively air-condition a plurality of corresponding rooms.

(Problem to be Solved by the Invention) However, in the above conventional system, the refrigerant is divided within the outdoor unit, and each of the divided refrigerants is distributed to the corresponding indoor unit. The disadvantage is that the pipes run parallel to each other and for a long time, and the length of the pipes is wasted accordingly.

In particular, when a multi-type air conditioner is installed in a high-rise building or the like, and the outdoor unit is placed in a rooftop or underground chamber, the length of the refrigerant piping after branching becomes extremely long.

Therefore, conventionally, as shown in FIG. 6, for example, an outdoor unit (a) and a plurality of indoor units (b) to (g) are connected to a plurality of (five in the figure) bifurcated branch pipes (h)... The refrigerant pipes are shared as much as possible by connecting the refrigerant pipes, but in this case, the number of bifurcated branch pipes (h) increases. Moreover, the number of brazing points for refrigerant piping at branch points is three per bifurcated branch pipe (h), so as the number of bifurcated branch pipes (h) increases, the number of brazing points increases. The disadvantages are that the number of man-hours increases, the construction cost increases, and the reliability against refrigerant leaks decreases. Furthermore, as the number of branch points increases, the refrigerant tends to drift more easily.

The present invention has been made in view of the above, and its purpose is to connect refrigerant piping to each indoor unit while using a refrigerant branch pipe as a header as in the above-mentioned conventional publication without using a bifurcated branch pipe. By sharing as many refrigerant pipes as possible, one refrigerant branch pipe can ensure good workability, reliability against refrigerant leaks, and refrigerant separation performance, while minimizing the length of refrigerant pipes for rest periods. It's about shortening it.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes one outdoor unit (A) and a plurality of indoor unit marks, as shown in FIGS. 1 to 5. ) to (F), and each inner unit (I3) to (F) is connected to refrigerant piping (42) to (45).
The present invention assumes a multi-type air conditioner connected in parallel to the outdoor unit (A) so that refrigerant can be circulated. A pair of main refrigerant pipes (42) and (43) extending from the outdoor unit (A) to one of the plurality of indoor units (B) to (F), and a plurality of indoor units (B) to (F), and is located near the main refrigerant pipe (4).
2), a main flow port (40b) connected to (43),
(4th), and indoor units (B) to (“
) Branch distribution ports (40i) to (40n) that are greater than the number of units
, (41i) to (41n), a pair of refrigerant branch pipes (40), (41), and each refrigerant branch pipe (40), (
41) branch flow ports (40i) to (40n), (4
1i) - (41n) and corresponding indoor units (B)
Branch refrigerant pipe (44) connecting ~([)...
(45)...

(Function) With the above configuration, in the present invention, the refrigerant branch pipe (40),
(41) consists of main flow ports (40b), (41h) and multiple branch flow ports (401 to 40n), (41i to 41
n), so that the refrigerant is branched and collected only in the refrigerant branch pipes (40) and (41),
The number of refrigerant branch points can be kept to a minimum of one point. As a result, the number of brazed locations on the refrigerant piping is reduced, reliability against refrigerant leakage is increased, and construction costs are also reduced. Moreover, the refrigerant branch point is the refrigerant branch pipe (40)
, (41) is in one place, so the refrigerant is supplied to the multiple indoor units (B) to (F) in an amount that corresponds to their capacity, and the uneven flow of the refrigerant is prevented as much as possible. Ru.

Moreover, the refrigerant branch pipes (40) and (41) are arranged near the plurality of indoor units (B) to ('), and are arranged in the vicinity of the plurality of indoor units (B) to (F), so that the refrigerant branch pipes (40) and (41) are arranged near the plurality of indoor units (B) to (F). After collecting in one main refrigerant pipe (42), (43) and circulating to the vicinity thereof, refrigerant branch pipes (40), (41)
Branch refrigerant piping (44)..., (45)
Since the refrigerant flows through the indoor units (B) to (F) through the refrigerant branch pipes (40) and (47), the refrigerant piping lengths from the refrigerant branch pipes (40) and (47) to the indoor units (B) to (F) are adjustable. be shortened accordingly.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the refrigerant piping system of a multi-type air conditioner according to the present invention, in which (A) shows one empty bowl unit i~ placed on the roof of a high-rise building, (B) ~('') are installed in the same interior (b configuration) in each room of a high-rise building.
This is an indoor unit. Inside the outdoor unit (A), there are a first compressor (1) and a second compressor 1ffl (2) connected in parallel with each other, a four-way switching valve (3), and an outdoor ventilation fan (4a). an outdoor heat exchanger (4) having
An expansion valve (5) is provided, and each of the devices (1) to (5)
) are connected to each other through refrigerant pipes (6) so that refrigerant can flow therethrough. In addition, each of the above indoor units (B) to (F)
are each equipped with an indoor heat exchanger (10) having an indoor backflow fan (1Oa) and an indoor electric expansion valve (10) for adjusting air conditioning capacity.
1), each of which is connected to a refrigerant pipe (12) so that refrigerant can flow therethrough.

A refrigerant branch pipe (40) on the gas side and a refrigerant branch pipe (41) on the liquid side are arranged near the five indoor units (B) to (F), and each refrigerant branch pipe (40), (
41) are the main refrigerant pipes (42), each having a long pipe length, (
43), and five branch refrigerant pipes (44)..., (45) each corresponding to the number of indoor units (B) to (F).
Each of the above five indoor units (B) to (
Therefore, each refrigerant branch pipe (40
), (41), each indoor unit (B), (r
) are connected in parallel to each other by branch refrigerant pipes (44)--, (45)--, and the main refrigerant pipes (42), (4
3) A refrigerant circulation system (14) is formed by being connected to the outdoor unit (8) so that refrigerant can be circulated therein. During cooling operation, the four-way switching valve (3) is switched as shown by the broken line in the figure to circulate the refrigerant as shown by the broken line arrow in the figure, so that each indoor heat exchanger (10)... The absorbed heat is repeatedly radiated to the outside air by the outdoor heat exchanger (4) to cool each room, while during heating operation,
By switching the four-way switching valve (3) as shown by the solid line in the figure to circulate the refrigerant as shown by the solid line arrows in the figure, the exchange of heat is reversed to heat the room.

Next, before detailing the specific configuration of the pair of refrigerant branch pipes (40) and (41), the remainder of the outdoor unit (A) will be explained. The second compressor (2) is connected to an unload Fjl structure (2a
), and when the pilot solenoid valve (17) of the pilot pressure introduction passage (16) is closed, high pressure is applied to the unloading machine (2a), and the second compression chamber (2) is fully loaded. On the other hand, when the pilot solenoid valve (17) is opened, low pressure is applied to unload the volume of the second compression (2) to 50%.

In addition, in the outdoor unit (8), (20) is a pressure equalizing hot gas bypass circuit that connects the refrigerant pipes (6), (6) (discharge pipe and suction pipe) before and after the four-way switching valve (3). The bypass circuit (20) is provided with a hot gas solenoid valve (21) that opens during low load during cooling operation and during defrosting operation of the outdoor heat exchanger (4). .

Furthermore, (22) is a heating overload bypass circuit connected to the refrigerant pipe (6) which becomes a discharge pipe during heating operation, and the bypass circuit (22) includes an auxiliary capacitor (23).
) and a high-pressure control valve (24) that opens when the refrigerant pressure is high.

(2) through the bypass circuit (22) and bypasses each indoor heat exchanger (10)...downstream refrigerant piping (6). ).

In addition, (25) is the heating overload bypass circuit (2
The downstream side of the auxiliary condenser (23) of 2) is connected to the four-way selector valve (
3) A liquid injection bypass circuit connected to the downstream refrigerant pipe (6) (suction pipe), the liquid injection bypass circuit (25) having a compression ff
! An injection solenoid valve (26) that opens and closes in conjunction with the operations of (1) and (2) and an expansion valve (27) are interposed.

Further, (30) is a receiver, (31) is an accumulator, (32) is a subcooling coil, and (33) is an oil separator, and the lubricating oil separated by the oil separator (33) is passed through the oil passage (
Both compressions are returned to (1) and (2) via (34).

Next, FIG. 2 shows a specific configuration of the refrigerant branch pipe (40) on the gas side. In the same figure, the gas side refrigerant branch pipe (4
0) faces a large-diameter mainstream passage (40a) with one end closed, and the other end of the mainstream passage (40a) is connected to a main refrigerant pipe (42) communicating with the outdoor unit (A). A main flow port (40b) is formed. In addition, on the side of the main flow passage (40a), first to sixth branch flow passages (40C) to (40h) having relatively small diameters run perpendicularly to the main flow passage (40a) in order from the left side in the figure. Branch flow ports (40,) to (40n) are formed at the ends of the branch flow passages (40c) to (40h), of which five branch flow ports (40i) to (40m) are connected. ) is connected to each refrigerant pipe (44) to each of the above-mentioned indoor units (B) to ('').

In addition, the even-numbered branch flow passage (40d), (40
f).

Near the end of (40h), there is a different diameter part (40p) with a slightly larger diameter slightly inside the end, (40q),
(40r) are formed respectively, and a different diameter portion (40s) having a slightly larger diameter than the main flow port (/fob) is also formed at the end of the main flow port (/fob). In other words, the formation of each different diameter portion depends on the capacity of the outdoor unit (A) (the compressor (1
) and (2) @hanging) types and indoor units (B) ~
This corresponds to the difference in capacity type ([), and as the capacity increases, the diameter of each refrigerant pipe (42) to (45) also increases, so a large capacity outdoor unit (A) is used. In this case, as shown in Figure 4 (a), the large diameter main refrigerant pipe (42) is inserted and connected to the different diameter section (408), while the small capacity outdoor unit (A) is used. for,
As shown in FIG. 4B, after cutting the different diameter section (40S), the small diameter main refrigerant pipe (42) is inserted and connected to this cut section. Similarly, when a small-capacity indoor unit (such as B) is used, the small-diameter branch refrigerant pipe (44) is connected to the branch flow path (/IOd, etc.) as shown in Figure 5 (a). It is inserted into the end and connected by positioning and supporting with the positioning protrusion (40t) formed on the front end of the different diameter part (40P etc.). In this case, as shown in the same figure (b), after cutting the different diameter part (40[)) at its center, connect a large diameter branch refrigerant pipe (44) to the different diameter part (40p). Insert and connect. With the above configuration, the number of parts is reduced and costs can be reduced compared to the case where refrigerant piping is connected using different diameter sockets made of separate materials depending on the capacity of each indoor and outdoor unit. At the same time, the number of brazing parts is reduced, which makes it possible to reduce construction costs and improve reliability against refrigerant leakage.

In addition, the refrigerant branch pipe (41) on the liquid side is shown in Fig. 3 (A).
As shown in FIG.
It has six relatively small-diameter branch flow passages (41b) to (41g) that run perpendicular to the main flow passage (41a) on the side of the main flow passage (41a). A main flow port (41h) communicating with the outdoor unit (8) via a main refrigerant pipe (43) is formed at the end of the main flow path (41a), and each of the branch flow paths At the ends of (41b) to (old g),
Branch flow ports (41i) to (41n) are formed respectively,
Of these, five branch distribution ports (41i) to [41m] are
Each branch refrigerant pipe (45
)... are communicated via. In addition, each of the above-mentioned branch flow passages (41b) to (41g), as shown in the same figure (b),
It is formed in a dogleg shape so that the refrigerant branch pipe (41) does not fall down when it is placed.

Therefore, in the embodiment described above, during heating operation, for example, the refrigerant in the refrigerant circulation system (14) is branched only through the refrigerant branch pipe (40) on the gas side and distributed to each indoor unit (B). It condenses in each indoor heat exchanger ("f1 condensation Z) (10), gathers only through the spread refrigerant branch pipe (41), returns to the outdoor unit (8), and returns to the outdoor heat exchanger (evaporator) (
The evaporation process in step 4) is repeated, and the room is properly heated and air-conditioned.

At that time, the gas side and diverging refrigerant branch pipes (40), (old) have six branch distribution channels for the main flow passages (40a), (41a), which have main flow ports (40b), (4111), respectively. Mouth (40i) ~ (/Ion) , (41i) ~
(41n) and functions perfectly, so when installing an air conditioner, five indoor units (13) to (
Compared to the case where multiple bifurcated branch pipes are used to connect the The number of locations is reduced, improving reliability against refrigerant leaks. Moreover, with the reduction in the number of branch points, the drift of the refrigerant is effectively suppressed, and the amount of refrigerant to each indoor unit (B) to (F) becomes approximately the amount of refrigerant corresponding to its capacity.

Furthermore, the outdoor unit (8) and each indoor unit (B) ~
Although the distance between the two refrigerant branch pipes ([) is long,
), (41) are placed near the indoor units (B) to ([), so the main refrigerant pipes (42) from the outdoor unit (A) to each refrigerant branch pipe (40), (41) ,
(/13) is shared for a long time, and each refrigerant branch pipe (40)
, (41) to the five indoor units (B) to (''), the length of the branch refrigerant pipes (44)..., (45)... can be shortened as much as possible.

Therefore, using refrigerant branch pipes as headers improves workability and
The refrigerant piping length from the refrigerant branch pipes (40) and (41) to each indoor unit (B) to (F) can be shortened as much as possible while improving reliability against refrigerant leaks and refrigerant distribution. It can be effective.

In the above embodiment, five indoor units (13) to (
[), but the number is not limited to five, and of course it is sufficient to use a plurality of devices.

(Effects of the Invention) As explained above, according to the multi-type air conditioner of the present invention, a refrigerant branch pipe having a refrigerant branching function to a plurality of indoor units is connected to one main flow port and a plurality of branch pipes. Since the refrigerant branch pipes are arranged near the plurality of indoor units, the number of branch pipes can be reduced to improve workability, reliability against refrigerant leakage, and refrigerant The length of the refrigerant piping from the refrigerant branch pipe to each indoor unit can be shortened as much as possible while improving distribution performance.

In particular, if a different diameter section is installed at the main flow port or branch flow port of the refrigerant branch pipe, it will be necessary to connect it using a hole diameter socket, etc. depending on the capacity of the outdoor unit or indoor unit to be installed. There is no need for wax (
= It is possible to reduce the number of joints, thereby reducing construction costs and improving reliability against refrigerant leaks.

[Brief explanation of the drawing]

Figures 1 to 5 show embodiments of the present invention. Figure 1 is a refrigerant piping system diagram, Figure 2 is a front view of a refrigerant branch pipe on the gas side, and Figures 3 (a) and (b) are 4(a) and 4(b) are explanatory diagrams showing the state of connection between the refrigerant pipe with a small diameter pipe and the main flow passage of the refrigerant branch pipe, respectively. Figures (a) and (b) are explanatory diagrams showing how refrigerant pipes having different pipe diameters and branch flow passages of refrigerant branch pipes are connected. FIG. 6 is a diagram showing the connection state of refrigerant piping in a conventional example. (A)...Outdoor unit, (B)-(F)...Indoor unit, (40)...Gas side refrigerant branch pipe, (41
)...Spread refrigerant branch pipe, (40a), (/l1
a) Mainstream passage, (40b) to (41h)...
Main flow outlet, (40c) ~ (40r), (41b)
~(/11g)--Branch flow path, (40i) ~(
40n), (41i) ~(4In)~branch flow port, (40p), (40q), (40r),
(40S)...Different diameter part, (42), (43)...
Main refrigerant piping, (/14), (45)...branch refrigerant piping. Special! F Applicant Daikin Industries, Ltd. 12, -- [
1

Claims (3)

[Claims] (1) Comprising one outdoor unit (A) and a plurality of indoor units (B) to (F), each indoor unit (B)
- (F) are connected in parallel to the outdoor unit (A) through refrigerant pipes (42) to (45) so that the refrigerant can be circulated, the outdoor unit (A) a pair of main refrigerant pipes (42) and (43) extending from the main refrigerant pipes to the vicinity of the plurality of indoor units (B) to (F);
The indoor unit ( The number of branch distribution ports (40
i) A pair of refrigerant branch pipes (40), (41) having ~(40n), (41i)~(41n), and branch flow ports (40i)~ of the refrigerant branch pipes (40), (41). (40n
), branch refrigerant pipes (44) that connect (41i) to (41n) and the corresponding indoor units (B) to (F).
An air conditioner comprising: (45)... (2) The refrigerant branch pipe (40) has a predetermined branch distribution port (40
j), (40l), (40n) forming branch flow passages (
In the vicinity of the ends of 40d), (40f), and (40h), large diameter portions (40p), (40q), and (40r) are formed, and a small capacity indoor unit (B)... When using the small-diameter refrigerant pipes (44)... to the ends of the branch flow passages (40d), (40f), (40h), while connecting the large-capacity indoor unit (B)... When in use, the different diameter parts (40p), (40q), (40r)
) is cut in the middle, and then the different diameter parts (40p) and (4
Claim (1), which is used by connecting a large diameter refrigerant pipe (44) to (0q), (40r).
Air conditioner as described in section. (3) The refrigerant branch pipe (40) has a large diameter portion (40s) formed at the end of the main flow port (40b), and when a large capacity outdoor unit (A) is used, a large diameter portion (40s) is formed at the end of the main flow port (40b). refrigerant piping (
42) to the different diameter part (40s), while when using a small capacity outdoor unit (A), the different diameter part (40s) is connected to the different diameter part (40s).
Claim No. s) is used by connecting a small-diameter refrigerant pipe (42) to the cut portion after cutting the cut portion (s).
The air conditioner according to item 1) or item (2).