JPH11108506A - Accumulator for refrigerating/warming cycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a small accumulator for refrigerating/warming cycle in which refrigeration or warming capacity can be exhibited sufficiently while reducing pressure loss. SOLUTION: The accumulator for refrigerating/warming cycle comprises a vertical cylindrical accumulator 15 having upper and lower shells, a plurality of compressors, coolant flow-out pipes 16a, 16b provided for each compressor in order to feed coolant from the accumulator 15 to each compressor, and at least one coolant flow-in pipe 7 for feeding coolant from each compressor to the accumulator 15. The coolant flow-out pipes 16a, 16b are coupled upward with the lower shell of the accumulator 15 while projecting the forward end of opening thereof into the accumulator 15 thus forming a liquid coolant 14 containing space below the accumulator 15 with oil return holes 9a, 9b being made at the lower projecting part. The coolant flow-in pipe 7 is coupled downward with the upper shell of the accumulator 15 and arranged not to overlap the coolant flow-out pipes 16a, 16b in the vertical direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an accumulator for a cooling / heating cycle such as an outdoor unit of a building package air conditioner (PAC) having a plurality of compressors.

[0002]

2. Description of the Related Art An accumulator having a plurality of compressors and used for a cooling / heating cycle will be described. FIG. 10 is a block diagram showing a refrigerant circuit of an outdoor unit of a package air conditioner (PAC) having a plurality of compressors disclosed in, for example, Japanese Utility Model Publication No. 53-39896.
It is an illustration figure at the time of using a stand. In the figure, 1a is a first compressor, 1b is a second compressor, 2 is an oil separator, 3 is a condenser, 4 is a throttle device, 5 is an evaporator, 6 is an accumulator, 7 is an evaporator 5, The refrigerant inflow pipes 8a and 8b flowing into the accumulator 6 are U-shaped refrigerant outflow pipes 9a and 9 connecting the compressors 1a and 1b and the inside of the accumulator 6.
b is an oil return hole for returning the oil and liquid refrigerant accumulated in the accumulator 6 to the compressors 1a and 1b, 10 is an oil inflow pipe connecting the oil separator 2 and the accumulator 6, and 11 is an intermediate pipe of the oil inflow pipe 10. It is an oil return device provided in.

Next, the flow of refrigerant and oil will be described. The high-temperature and high-pressure gas refrigerant discharged from the compressors 1a and 1b flows into the oil separator 2, where the gas refrigerant and oil are separated, and the gas refrigerant flows into the condenser 3. Here, the gas refrigerant exchanges heat with air, water or the like, condenses and liquefies, and in the expansion device 4, enters a low-pressure gas-liquid two-phase state and flows into the evaporator 5. Here, the refrigerant exchanges heat with air, water, or the like, enters a gas or gas-liquid two-phase state with a high degree of dryness, flows into the accumulator 6, is separated into gas and liquid, and accumulates in the accumulator 6. Most of the gas refrigerant returns to the compressor 1 via the U-shaped refrigerant outflow pipes 8a and 8b. The oil separated by the oil separator 2 flows into the accumulator 6 through the oil inlet pipe 10 and the oil return device 11, returns to the compressor 1 through the oil return holes 9a and 9b, and can be separated by the oil separator 2. The oil that did not exist was condensed with the liquid refrigerant together with the condenser 3, the throttle device 4,
It flows with the evaporator 5 and accumulates in the accumulator 6 in a state where oil is mixed with the liquid refrigerant.

The oil and liquid refrigerant 14 accumulated in the accumulator 6 are subjected to a differential pressure due to frictional loss of the gas refrigerant flowing through the refrigerant outflow pipes 8a and 8b and between the liquid level of the liquid refrigerant in the accumulator 6 and the oil return hole 9. The pressure difference generated by summing the liquid heads generated before and after the oil return holes 9a and 9b flows to the refrigerant outflow pipes 8a and 8b.

In the case where the compressors 1a and 1b are stopped for a long time and are started from a state where the liquid refrigerant is stagnated (at a low temperature) in the shells of the compressors 1a and 1b, the compressors 1a and 1b
A large amount of liquid refrigerant and oil is discharged from the shell of the above, but the liquid refrigerant and oil are captured by the oil separator 2 and a large amount of oil is prevented from flowing out to the condenser 3 and the like.

Further, when the heat load of the refrigeration cycle apparatus is reduced, the first compressor 1a,
The second compressor 2b is gradually stopped. Refrigerant outlet pipe 8a,
8b is provided independently for the plurality of compressors 1a and 1b, so that the flow rate of the gas refrigerant flowing through the refrigerant outflow pipes 8a and 8b is kept constant even when the number of operating compressors 1a and 1b is reduced. The oil can be properly returned to the compressors 1a and 1b without bias.

Next, the structure of a conventional accumulator is shown in FIG.
Shown in The accumulator 6 is a pressure vessel, and in this example, the accumulator body has a two-piece structure of accumulator shells 12 and 13 that have been subjected to deep drawing by press working or the like, and each is joined from the outer peripheral side by MIG welding or the like, Hermeticity is maintained. Reference numeral 7 denotes a refrigerant inflow pipe into which a gas or a refrigerant in a gaseous two-phase state having a large degree of dryness flows, 8a and 8b denote U-shaped refrigerant outflow pipes, and 9a,
9b is an oil return hole provided in the middle of the U-shaped refrigerant outflow pipes 8a and 8b, and 14 is a liquid refrigerant stored in the accumulator 6 container.

Here, the operation of the refrigerant and the lubricating oil in the accumulator will be described. Gas or a gas-liquid two-phase refrigerant having a high degree of dryness and lubricating oil flow from the inflow pipe 7. This refrigerant hits the upper piece 12 of the accumulator shell,
The gas-phase refrigerant accumulates at the top of the accumulator, and the lubricating oil and liquid refrigerant accumulate at the bottom of the accumulator container. The gas-phase refrigerant is sucked through the U-shaped refrigerant outflow pipes 8a and 8b and flows out to the compressors 1a and 1b. As described above, the liquid refrigerant having a high concentration of the lubricating oil is a U-shaped refrigerant outlet pipe 8a, 8b.
A small amount of oil is sucked from the oil return holes 9a, 9b provided in the bent portions, and flows out to the compressors 1a, 1b together with the gas-phase refrigerant flowing inside the refrigerant outlet pipes 8a, 8b.

[0009]

Since the conventional accumulator for a refrigeration cycle is configured as described above, for example, in a refrigeration cycle apparatus having three or more compressors, a U-shaped It is necessary to provide the refrigerant outlet pipes individually. Therefore, there is a problem that the entire accumulator 6 becomes large.

Further, since the refrigerant outlet pipes 8a and 8b are U-shaped, the pipe length becomes longer, and the pressure loss when the gas-phase refrigerant passes through the refrigerant outlet pipe becomes large, so that the refrigeration capacity is sufficiently exhibited. Was not able to be performed, resulting in a decrease in performance. Note that there is a similar problem when used for heating.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a small size and a small pressure loss.
An object of the present invention is to obtain an accumulator for a cooling / heating cycle capable of sufficiently exhibiting a freezing or heating capacity.

[0012]

According to a first aspect of the present invention, there is provided an accumulator for a thermal cycle comprising: a vertical cylindrical accumulator having upper and lower shells; a plurality of compressors;
A refrigerant outflow pipe provided for each of the compressors, for sending refrigerant from the accumulator to the compressors, and at least one refrigerant inflow pipe for flowing refrigerant from the compressors to the accumulator, wherein the refrigerant The outflow pipe is connected upward to the lower shell of the accumulator, the tip of the opening protrudes into the accumulator to form a liquid refrigerant storage space at the lower part of the accumulator, and has an oil return hole at the lower part of the protrusion, The refrigerant inflow pipe is connected downward to the upper shell of the accumulator, and the refrigerant outflow pipe and the refrigerant inflow pipe are arranged so as not to overlap in the vertical direction.

According to a second aspect of the present invention, there is provided a cooling / heating cycle accumulator provided with a vertical cylindrical accumulator having upper and lower shells, a plurality of compressors, and each of the compressors. A refrigerant outflow pipe for sending refrigerant to the compressor, and at least one refrigerant inflow pipe for flowing refrigerant from each of the compressors to the accumulator, wherein the refrigerant outflow pipe is downwardly connected to an upper shell of the accumulator, The refrigerant inflow pipe is upwardly connected to a lower shell of the accumulator, protrudes into the accumulator to form a liquid refrigerant storage space at the lower part of the accumulator, and the refrigerant outflow pipe and the refrigerant inflow pipe do not overlap in the vertical direction. Are arranged as follows.

According to a third aspect of the present invention, there is provided a cooling / heating cycle accumulator according to the second aspect, wherein the refrigerant outlet pipe has a tip end of an opening protruding into the accumulator.

The accumulator for a thermal cycle according to a fourth aspect of the present invention is the accumulator for a thermal cycle according to the second or the third aspect, wherein a baffle plate for blocking a line of sight between the refrigerant outflow pipe and the refrigerant inflow pipe is provided.

According to a fifth aspect of the present invention, there is provided an accumulator for a thermal cycle comprising a vertical cylindrical accumulator having upper and lower shells, a plurality of compressors, and each of the compressors. A refrigerant outflow pipe for sending refrigerant to the compressor, and at least one refrigerant inflow pipe for flowing refrigerant from each of the compressors to the accumulator, wherein the refrigerant outflow pipe is connected to the accumulator body from the side, The tip of the opening protrudes into the accumulator, the refrigerant inflow pipe is connected upward to the lower shell of the accumulator, and the tip of the opening protrudes into the accumulator to form a liquid refrigerant accommodating space at the lower part of the accumulator. is there.

According to a sixth aspect of the present invention, there is provided the accumulator for a cooling / heating cycle according to the fifth aspect, wherein the accumulator body has an opening inside the accumulator body below the opening of the refrigerant outflow pipe and below an opening of the refrigerant inflow pipe. At a position, a partition plate for vertically dividing the internal space of the accumulator is provided, and a communication hole for flowing a liquid refrigerant is provided between the partition plate and the refrigerant inflow pipe.

According to a seventh aspect of the present invention, there is provided an accumulator for a cooling / heating cycle according to the fifth aspect, further comprising a partition plate for vertically dividing an internal space of the accumulator near a refrigerant inlet pipe opening protruding into the accumulator. A communication hole is provided between the plate and the inner peripheral portion of the accumulator body to allow a liquid refrigerant to flow.

An accumulator for a thermal cycle according to an eighth aspect of the present invention is provided with a vertical cylindrical accumulator having upper and lower shells, a plurality of compressors, and each of the compressors. A refrigerant outflow pipe for sending refrigerant to the compressor, and at least one refrigerant inflow pipe for flowing refrigerant from each of the compressors to the accumulator, wherein the refrigerant outflow pipe and the refrigerant inflow pipe are directed upward to a lower shell of the accumulator. The accumulator has a liquid refrigerant accommodating space formed below the accumulator, and an oil return hole formed below the refrigerant outlet pipe protruding portion.

A ninth configuration of the accumulator for a cooling and heating cycle according to the present invention is the accumulator according to any one of the first to eighth configurations, wherein the opening of the refrigerant inflow pipe is gradually widened.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a sectional side view showing a configuration of an accumulator for a refrigeration cycle according to Embodiment 1 of the present invention. In the figure, 15 is formed in a vertically placed cylindrical shape,
Accumulator main bodies 16a and 16b, which are pressure vessels having upper and lower shells, are straight tubular refrigerant outflow pipes connected to each of the plurality of compressors, and are connected upward to the lower shell of the accumulator main body 15 and have openings formed therein. The distal end projects into the accumulator 15 to form a liquid refrigerant storage space below the accumulator 15. Reference numeral 7 denotes a refrigerant inflow pipe, which is connected to the upper shell of the accumulator 15 downward. 9a, 9b are refrigerant outflow pipes 16a, 16b
An oil return hole 14 provided on the side surface of the lower part of the protruding part of the liquid refrigerant is liquid refrigerant stored in the lower part of the accumulator container. The openings of the refrigerant outflow pipes 16a and 16b are installed so as not to overlap with the opening of the refrigerant inflow pipe 7 provided on the accumulator main body 15 in the vertical direction.

Next, the flow of the refrigerant and the oil when the accumulator according to the present embodiment is used will be described. However, the refrigerant circuit other than the accumulator is the same as the conventional refrigerant circuit shown in FIG. 10, and the description is omitted. The gas flowing out of the evaporator 5 or the refrigerant in a gas-liquid two-phase state having a large degree of dryness flows into the accumulator main body container 15 through the refrigerant inflow pipe 7, and is gas-liquid separated due to a rapid decrease in flow velocity, and the gas is separated. Most of the refrigerant returns to the plurality of compressors 1a and 1b via the refrigerant outflow pipes 16a and 16b. The liquid refrigerant 14 that has been gas-liquid separated accumulates in the lower part of the accumulator main body container 15. At this time, lubricating oil is mixed in the liquid refrigerant 14, and the pressure difference generated when the gas refrigerant flows into the refrigerant outflow pipes 16a and 16b causes the oil return hole 9 to flow.
The lubricating oil and the liquid refrigerant are sucked from a and 9b, and the liquid refrigerant 14 containing the lubricating oil is returned to the plurality of compressors 1a and 1b to prevent the compressors 1a and 1b from running out of lubricating oil.

Further, since the mixed liquid of the gas refrigerant, the liquid refrigerant and the lubricating oil does not pass through the long piping like the refrigerant outlet pipes 8a and 8b of the conventional accumulator 6, the pressure loss at the accumulator can be reduced. it can. Also, while the shape of the refrigerant outflow pipes 8a and 8b of the conventional accumulator 6 is U-shaped, in the present embodiment, the refrigerant outflow pipe 16
Since the pipes a and 16b are straight pipes, the outer diameter of the accumulator can be reduced as compared with the case where a plurality of U-shaped refrigerant outflow pipes 8a and 8b are installed in the accumulator container, and the accumulator body 15 can be downsized. Can be. As described above, the accumulator for a refrigeration cycle according to the present embodiment can ensure the original oil return function, and can sufficiently exhibit the refrigeration capacity due to the small pressure loss in the accumulator section, and can be downsized. .

Embodiment 2 FIG. FIG. 2 is a sectional side view showing a configuration of an accumulator for a refrigeration cycle according to Embodiment 2 of the present invention. In the figure, reference numerals 17a and 17b denote oil return pipes provided below the accumulator container 15 and connected to straight tubular refrigerant outflow pipes 16a and 16b. In the present embodiment, the refrigerant inflow pipe 7 is connected to the accumulator main body container 15.
And upwardly projecting into the accumulator main body container 15 to form a liquid refrigerant accommodating space under the accumulator main body 15. Refrigerant outflow pipe 1
Reference numerals 6a and 16b are connected downward to the upper shell of the accumulator main body container 15, and are provided at positions where the gas refrigerant flows smoothly from the upper ceiling central ceiling of the accumulator container 15. The openings of the refrigerant outflow pipes 16a and 16b are installed so as not to overlap with the opening of the refrigerant inflow pipe 7 provided in the lower part of the accumulator body 15 in the vertical direction.

Next, the operation and operation of the accumulator according to this embodiment will be described. The gas flowing out of the evaporator 5 or the refrigerant in a gas-liquid two-phase state having a large degree of dryness flows into the accumulator main body container 15 through the refrigerant inflow pipe 7,
It collides with the upper part of the accumulator container 15. As a result, the speed of the refrigerant can be reduced, and gas-liquid separation is performed efficiently. The gas-liquid separated liquid refrigerant 14 is dropped along the wall surface of the accumulator container 15 and accumulates in the lower part of the accumulator container 15. Thus, the accumulator container 1
5, the gas refrigerant is efficiently separated, and the liquid refrigerant 14 is
Accumulates in the lower part of the accumulator container 15, so that almost only gas refrigerant flows out of the refrigerant outlet pipes 16a and 16b. Therefore, it is possible to prevent a problem that the liquid refrigerant 14 returns directly to the compressors 1a and 1b to cause liquid compression and damage the compressors 1a and 1b. Further, the liquid refrigerant 14 which has been separated into gas and liquid and accumulated in the lower part of the accumulator main body container 15 returns to the oil return provided in the lower part of the accumulator container 15 due to a differential pressure generated by frictional loss of the gas refrigerant flowing inside the pipes of the refrigerant outflow pipes 16a and 16b. It flows to pipes 17a and 17b and is returned to the compressors 1a and 1b.

Further, in this embodiment, the refrigerant inflow pipe 7 is provided so as to protrude below the accumulator container 15 so that foreign matter such as oxidized scale generated at the time of brazing the pipe and sand and dust entering at the time of connecting the pipe is accumulated. 1
5 can be stored at the bottom. Accordingly, it is possible to prevent foreign matters such as oxide scale, sand, dust and the like from returning to the compressors 1a and 1b via the refrigerant outflow pipes 16a and 16b and damaging the compressors 1a and 1b.

Embodiment 3 FIG. 3 is a sectional side view showing a configuration of an accumulator for a refrigeration cycle according to Embodiment 3 of the present invention. In this embodiment, the ends of the openings of the straight tubular refrigerant outflow pipes 16a and 16b are connected to the accumulator container 1
5 protruded inside. Thus, the ends of the openings of the refrigerant outflow pipes 16a and 16b are connected to the accumulator container 1
By protruding and provided inside 5, the liquid refrigerant 14 colliding at the upper part of the accumulator container 15 and separated into gas and liquid can be prevented from flowing around from the back surfaces of the refrigerant outflow pipes 16a and 16b and flowing in. As a result, the liquid refrigerant 14 returns directly to the compressors 1a and 1b to cause liquid compression, and the compressors 1a and 1b
1b can be prevented from being damaged.

Embodiment 4 FIG. 4A is a sectional side view showing a configuration of an accumulator for a refrigeration cycle according to Embodiment 4 of the present invention, and FIG. 4B is a horizontal sectional view of FIG.
In the figure, reference numeral 18 denotes a baffle formed on the inner surface of the accumulator container 15 so as to block the openings of the refrigerant outflow pipes 16a and 16b. In the drawing, the baffle plate 18 is hatched for clarity. In the present embodiment, the baffle plate 18 is joined to the inner surface of the accumulator container 15 by welding or the like, and blocks the outlook of each opening of the refrigerant inflow pipe 7 and the refrigerant outflow pipes 16a and 16b. The baffle plate 18
Is manufactured by sheet metal, press working, or the like.

Next, the operation when the accumulator according to the present embodiment is used will be described. The refrigerant in the gas-liquid two-phase state discharged from the refrigerant inflow pipe 7 collides with the upper part of the accumulator container 15 and is separated into gas and liquid by a rapid decrease in flow velocity. However, when the gas-liquid two-phase refrigerant discharged from the refrigerant inflow pipe 7 is almost liquid refrigerant, the liquid refrigerant may directly flow into the refrigerant outflow pipes 16a and 16b.

In the present embodiment, the baffle plate 18 is provided so as to block the view of the opening of each of the refrigerant inflow pipe 7 and the refrigerant outflow pipes 16a and 16b. Since the refrigerant does not flow into the refrigerant outflow pipes 16a and 16b, damage to the compressor due to liquid back can be prevented.

The baffle plate 18 allows the refrigerant inflow pipe 7 and the refrigerant outflow pipes 16a and 16b to vertically overlap each other, so that the mounting interval between the refrigerant outflow pipes 16a and 16b can be further reduced. Therefore, the outer diameter of the accumulator can be reduced, and the main body of the accumulator container 15 can be downsized.

Embodiment 5 FIG. 5 is a sectional side view showing a configuration of an accumulator for a refrigeration cycle according to Embodiment 5 of the present invention. In the present embodiment, the refrigerant outflow pipe 16
a and 16b are connected from the side of the body of the accumulator container 15, and the leading ends of the openings are provided to protrude into the accumulator container 15. The refrigerant inflow pipe 7 is upwardly connected to a lower shell of the accumulator container 15, and a tip end of an opening thereof projects into the accumulator 15 to form a liquid refrigerant accommodating space below the accumulator 15. As described above, by providing the refrigerant outflow pipes 16a and 16b in the body of the accumulator container 15 so as to protrude inward from the side, the liquid refrigerant 14 which collides at the upper part of the accumulator container 15 and is separated into gas and liquid by the refrigerant outflow pipe 16a, 16b. It is possible to eliminate inflow from the back of the 16b. Thus, it is possible to prevent a problem that the liquid refrigerant 14 returns directly to the compressors 1a and 1b to cause liquid compression and damage the compressors 1a and 1b. Also, the refrigerant outflow pipes 16a, 1
6b provided in the body of the container 15, the refrigerant outlet pipe 1
Since the mounting interval between 6a and 16b can be reduced, the accumulator 15 can be further reduced in size.

Embodiment 6 FIG. FIG. 6A is a cross-sectional side view showing a configuration of an accumulator for a refrigeration cycle according to Embodiment 6 of the present invention, and FIG. 6B is a horizontal cross-sectional view of FIG.
In the figure, reference numeral 19 denotes a partition plate formed inside the body of the accumulator container 15 to divide the internal space of the accumulator container 15 into upper and lower portions, and refrigerant outlet pipes 16a, 16
It is provided below the opening of b and below the opening of the refrigerant inflow pipe 7. 20 is an upper room in the accumulator container 15 partitioned by the partition plate 19, 21 is a lower room in the accumulator container 15 partitioned by the partition plate 19, and 22 is between the partition plate 19 and the refrigerant inflow pipe 7. It is a communication hole provided so as to surround the refrigerant inflow pipe 7 and communicates the upper room 20 and the lower room 21, and the liquid refrigerant gas-liquid separated in the upper room 20 passes through the communication hole 22 to the lower side. Collect in room 21. In the figure, the partition plate 19 is hatched for clarity. A partition plate 19 for vertically dividing the container 15 is provided in the container 15 to divide the container 15 into an upper room 20 and a lower room 21.
The lower chamber 21 is provided with a refrigerant inflow pipe 7 and oil return pipes 17a and 17b. In the present embodiment,
The partition plate 19 is joined to the inner surface of the accumulator container 15 by welding or the like. The partition plate 19 is manufactured by sheet metal, press working, or the like.

Next, the operation will be described. In each of the above embodiments, the liquid refrigerant 14 accumulated in the accumulator container 15 is vigorously stirred by the flow of the refrigerant flowing from the refrigerant inflow pipe 7, and the blown up droplets are cooled by the refrigerant outflow pipe 16 a,
16b. In the present embodiment, the interior of the accumulator container 15 is divided by the partition plate 19 having the communication hole 22 into the upper chamber 20 having the refrigerant outflow pipes 16a and 16b and storing the gas refrigerant, the refrigerant inflow pipe 7 and the oil return pipe 1
7a, 17b, and a lower chamber 21 in which the liquid refrigerant 14 is stored.
And the opening of the refrigerant inflow pipe 7 is provided inside the upper room 20, so that the liquid refrigerant 14 accumulated in the lower room 21 is not violently agitated by the flowing refrigerant, and Liquid refrigerant can be prevented from entering. This can prevent the liquid refrigerant from directly returning to the compressor (not shown) and damaging the compressor (not shown). Further, in the present embodiment, the upper body, the lower body, and the partition plate 19 of the accumulator 15 can be joined at the same position, so that the manufacturing process can be simplified.

Embodiment 7 FIG. FIG. 7A is a sectional side view showing a configuration of an accumulator for a refrigeration cycle according to Embodiment 7 of the present invention, and FIG. 7B is a horizontal sectional view of FIG.
In the drawing, reference numeral 23 denotes a droplet-like liquid refrigerant in which the gas-liquid two-phase refrigerant flowing out of the refrigerant inflow pipe 7 collides at the upper part of the accumulator container 15 and is separated into gas and liquid, and flows down along the inner surface of the accumulator container 15. is there. In the present embodiment,
Partition plate 1 for dividing upper room 20 and lower room 21 up and down
9 is provided in the vicinity of the opening of the refrigerant inflow pipe 7, and the communication hole 2 for the liquid refrigerant is provided.
2 and the inner peripheral part of the body of the accumulator container 15 and the partition plate 1
It is provided between the nine outer end faces. In the figure, the partition plate 19 is hatched for clarity.

Next, the operation will be described. The partition plate 19 according to the present embodiment functions in the same manner as the partition plate 19 according to the above-described sixth embodiment, and blows up the liquid refrigerant 14 accumulated in the room 21 below the lower part of the accumulator container 15 and causes the liquid refrigerant to reach the liquid level. Bouncing can be prevented more. Further, the liquid refrigerant 23 colliding at the upper part of the accumulator container 15 and separated into gas and liquid flows down along the inner surface of the body of the accumulator container 15. In the sixth embodiment, the liquid refrigerant 23 flowing down along the inner surface of the container flows along the upper surface of the partition plate 19, drops into the room 21 below the communication hole 22, and accumulates in the room 21 below. However, when the flow rate of the gas-liquid two-phase refrigerant flowing from the evaporator (not shown) increases, the speed of the gas-liquid two-phase refrigerant in the upper room 20 may not be sufficiently reduced. . In that case, the liquid refrigerant 23 flowing along the upper surface of the partition plate 19 is blown up, and the refrigerant outflow pipe 16
a, 16b, the liquid refrigerant directly intrudes into the lower room 21.
There is a possibility that the liquid refrigerant does not accumulate in the water. In the present embodiment, since the communication hole 22 provided in the partition plate 19 is provided between the inner peripheral portion of the body of the accumulator container 15 and the outer end surface of the partition plate 19, the liquid refrigerant 23 flowing down the inner surface of the accumulator container 15 The gas flows smoothly along the inner surface of the accumulator container 15 without being affected by the flow of the gas refrigerant separated in the upper chamber 20 and accumulates in the lower chamber 21. Thereby, the liquid refrigerant 23 can be prevented from blowing up from the upper surface of the partition plate 19.

Embodiment 8 FIG. FIG. 8 is a sectional side view showing a configuration of an accumulator for a refrigeration cycle according to Embodiment 8 of the present invention. In the present embodiment, the refrigerant inflow pipe 7 and the refrigerant outflow pipes 16a and 16b are connected upward to the lower shell of the accumulator container 15, and the ends of the openings of the pipes are provided so as to protrude into the accumulator container 15. . As described above, the refrigerant inflow pipe 7 and the refrigerant outflow pipes 16a and 16b are gathered at the lower part of the accumulator container 15 and provided so as to protrude into the container 15, thereby blowing up the liquid refrigerant 14 accumulated at the lower part of the accumulator container 15, The liquid refrigerant 14 is prevented from directly entering the outflow pipes 16a and 16b. In the first embodiment, when the flow rate of the gas-liquid two-phase refrigerant flowing from the refrigerant outflow pipe 7 provided at the upper part of the accumulator container 15 increases, the flow rate of the gas refrigerant inside the container increases, so that the lower part of the accumulator container 15 There is a possibility that the accumulated liquid refrigerant 14 is blown up. Further, a refrigerant inflow pipe 7 and a refrigerant outflow pipe 16a, 1
By integrating the 6b, the processing surface of the container 15 becomes unidirectional, and the processing and assembly time of the accumulator can be significantly reduced.

Embodiment 9 FIG. 9 shows a refrigerant inflow pipe 7 of a refrigeration cycle accumulator according to Embodiment 9 of the present invention.
It is sectional side view which showed the periphery of the part. In the present embodiment, the opening shape of the refrigerant inflow pipe 7 is formed so as to gradually expand in the flow direction. As a result, it is possible to eliminate the flow loss due to the rapid expansion of the flow path at the outlet of the refrigerant inflow pipe 7, and to reduce the pressure loss of the entire accumulator. This configuration can be applied to each of the above embodiments.

Although the refrigerating cycle has been described as an example in each of the above embodiments, the accumulator of the present invention can be used for heating.

[0040]

According to the first aspect of the present invention, a vertical cylindrical accumulator having upper and lower shells, a plurality of compressors, and a plurality of compressors are provided for each of the compressors. A refrigerant outflow pipe for sending refrigerant to the compressor, and at least one refrigerant inflow pipe for flowing refrigerant from each of the compressors to the accumulator, wherein the refrigerant outflow pipe is connected upward to a lower shell of the accumulator, and The tip of the opening protrudes into the accumulator to form a liquid refrigerant accommodating space at the lower part of the accumulator, has an oil return hole at the lower part of the protruding part, and the refrigerant inflow pipe is downwardly connected to an upper shell of the accumulator, Since the refrigerant outlet pipe and the refrigerant inlet pipe are arranged so as not to overlap in the vertical direction, the original oil return function can be secured and Sufficiently be exhibited refrigeration or heating capacity by pressure loss in the Yumureta portion is small, in which can be miniaturized.

According to the second configuration of the present invention, a vertical cylindrical accumulator having upper and lower shells, a plurality of compressors, and a plurality of compressors are provided for each of the compressors, and the refrigerant is transferred from the accumulator to each of the compressors. And an at least one refrigerant inflow pipe for injecting refrigerant from each of the compressors into the accumulator, wherein the refrigerant outflow pipe is connected downwardly to an upper shell of the accumulator, The pipe is connected upward to the lower shell of the accumulator, protrudes into the accumulator to form a liquid refrigerant storage space at the lower part of the accumulator, and the refrigerant outflow pipe and the refrigerant inflow pipe are arranged so as not to overlap in the vertical direction. Therefore, in addition to the above effects, by providing a refrigerant inflow pipe at the bottom of the accumulator and a refrigerant outflow pipe at the top, Jumped that accumulated liquid refrigerant in the lower regulator can be reduced from entering directly into the refrigerant outlet pipe, it is possible to prevent breakage of the compressor due to liquid back. In addition, foreign substances such as oxide scale, sand, dust, etc., which are generated or intruded when connecting pipes, can be collected at the bottom of the container,
The return to the compressor via the refrigerant outflow pipe can be prevented.

According to the third aspect of the present invention, in the second aspect, the refrigerant outlet pipe has a tip end of the opening projecting into the accumulator, so that the refrigerant collides at the upper part of the accumulator and is separated into gas and liquid. The liquid refrigerant can be prevented from wrapping around from the back of the refrigerant outflow pipe and flowing in, and damage to the compressor due to liquid back can be prevented.

According to the fourth configuration of the present invention, in the second or third configuration, a baffle plate is provided to block a line of sight between the refrigerant outflow pipe and the refrigerant inflow pipe. Since the discharged liquid refrigerant does not flow directly into the refrigerant outflow pipe, damage to the compressor due to liquid back can be prevented. Further, the vertical overlap between the refrigerant inflow pipe and the refrigerant outflow pipe is allowed by the baffle plate, so that the mounting interval between the refrigerant outflow pipes can be further reduced. Therefore, the outer diameter of the accumulator can be reduced, and the accumulator container body can be reduced in size.

According to the fifth configuration of the present invention, a vertical cylindrical accumulator having upper and lower shells, a plurality of compressors, and a plurality of compressors are provided for each of the compressors, and the refrigerant flows from the accumulator to each of the compressors. And an at least one refrigerant inflow pipe for injecting refrigerant from each of the compressors into the accumulator, the refrigerant outflow pipe being connected to the accumulator body from the side, and having an opening The leading end protrudes into the accumulator, the refrigerant inflow pipe is connected upward to the lower shell of the accumulator, and the leading end of the opening protrudes into the accumulator to form a liquid refrigerant accommodating space at the lower part of the accumulator. This prevents the liquid refrigerant separated by gas and liquid from sneaking around from the back of the refrigerant outflow pipe and flowing in. It is possible to prevent the breakage of the compressor due to liquid back. Further, by providing the refrigerant outflow pipe in the container body, the mounting interval of the refrigerant outflow pipe can be reduced, so that the accumulator can be further downsized.

According to a sixth configuration of the present invention, in the fifth configuration, the inside of the accumulator body is located below the opening of the refrigerant outflow pipe and below the opening of the refrigerant inflow pipe. Since a partition plate for vertically dividing the accumulator internal space is provided and a communication hole for flowing a liquid refrigerant is provided between the partition plate and the refrigerant inflow tube, a lower chamber is formed by the refrigerant flowing from the refrigerant inflow tube. It is possible to prevent the liquid refrigerant accumulated in the lower chamber from being violently stirred and prevent the liquid refrigerant accumulated in the lower room from entering the upper room and flowing into the refrigerant outlet pipe. This can prevent the compressor from being damaged by the liquid bag.

According to the seventh aspect of the present invention, in the fifth aspect, a partition plate for vertically dividing an internal space of the accumulator is provided near a refrigerant inlet pipe opening protruding into the accumulator. Since a communication hole for flowing the liquid refrigerant is provided between the accumulator body and the inner peripheral portion of the accumulator body, the liquid refrigerant which is separated into gas and liquid in the upper room and flows down along the inner surface of the accumulator container flows in the upper room. It is not affected by the water, flows smoothly along the inner surface of the accumulator container, and accumulates in the lower room. This prevents the liquid refrigerant from blowing up from the upper surface of the partition plate.

According to the eighth configuration of the present invention, a vertical cylindrical accumulator having upper and lower shells, a plurality of compressors, and a plurality of compressors are provided for each of the compressors, and the refrigerant is transferred from the accumulator to each of the compressors. A refrigerant outflow pipe for sending out, and at least one refrigerant inflow pipe for flowing refrigerant from each of the compressors to the accumulator, wherein the refrigerant outflow pipe and the refrigerant inflow pipe are connected upward to a lower shell of the accumulator, The leading end of the opening of each tube is projected into the accumulator, a liquid refrigerant storage space is formed in the lower part of the accumulator, and an oil return hole is provided in the lower part of the refrigerant outlet pipe projection, so that the liquid refrigerant accumulated in the lower part of the accumulator container is removed. Liquid refrigerant that blows up and directly enters the refrigerant outflow pipe can be reduced. In addition, since the refrigerant inflow pipe and the refrigerant outflow pipe are integrated at the lower part of the accumulator container, the processing surface of the container becomes unidirectional, so that the processing and assembly time of the accumulator can be greatly reduced.

According to the ninth aspect of the present invention, in any one of the first to eighth aspects, the opening of the refrigerant inflow pipe is gently expanded, so that the flow path at the outlet of the refrigerant inflow pipe is rapidly expanded. The flow loss due to the flow can be eliminated, and the pressure loss of the entire accumulator can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional side view showing a configuration of an accumulator for a refrigeration cycle according to a first embodiment of the present invention.

FIG. 2 is a sectional side view showing a configuration of an accumulator for a refrigeration cycle according to a second embodiment of the present invention.

FIG. 3 is a sectional side view showing a configuration of an accumulator for a refrigeration cycle according to Embodiment 3 of the present invention.

FIG. 4 shows a configuration of an accumulator for a refrigeration cycle according to a fourth embodiment of the present invention, where (a) is a cross-sectional side view,
(B) is a horizontal sectional view.

FIG. 5 is a sectional side view showing a configuration of an accumulator for a refrigeration cycle according to Embodiment 5 of the present invention.

FIG. 6 shows a configuration of an accumulator for a refrigeration cycle according to a sixth embodiment of the present invention, where (a) is a cross-sectional side view,
(B) is a horizontal sectional view.

FIG. 7 shows a configuration of an accumulator for a refrigeration cycle according to a seventh embodiment of the present invention, where (a) is a cross-sectional side view,
(B) is a horizontal sectional view.

FIG. 8 is a sectional side view showing a configuration of an accumulator for a refrigeration cycle according to an eighth embodiment of the present invention.

FIG. 9 is a cross-sectional side view showing a periphery of a refrigerant inflow pipe portion of a refrigeration cycle accumulator according to Embodiment 9 of the present invention.

FIG. 10 is a block diagram showing a refrigerant circuit configuration of a conventional refrigeration cycle outdoor unit including a plurality of compressors.

FIG. 11 is a sectional side view showing a configuration of a conventional refrigeration cycle accumulator.

[Explanation of symbols]

1a, 1b compressor, 2 oil separator, 3 condenser,
4 throttle device, 5 evaporator, 6 accumulator,
7 refrigerant inflow pipe, 8a, 8b U-shaped refrigerant outflow pipe, 9a, 9b oil return hole, 10 oil inflow pipe, 11
Oil return device, 12 accumulator shell upper piece,
13 lower part of accumulator shell, 14 liquid refrigerant, 15 accumulator body, 16a, 16b
Straight tubular refrigerant outlet pipe, 17a, 17b oil return pipe,
18 baffles, 19 dividers, 20 rooms above,
21 Lower room, 22 Communication hole, 23 Droplet liquid refrigerant.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomohiko Kasai 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Keisuke Sozono 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside Mitsubishi Electric Corporation (72) Inventor Yoshio Ueno 2-6-1 Otemachi, Chiyoda-ku, Tokyo Mitsubishi Electric Engineering Corporation

Claims (9)

[Claims] 1. A vertical cylindrical accumulator having upper and lower shells, a plurality of compressors, a refrigerant outlet pipe provided for each of the compressors, and for sending a refrigerant from the accumulator to each of the compressors, At least one refrigerant inflow pipe for flowing refrigerant from each compressor to the accumulator, wherein the refrigerant outflow pipe is upwardly connected to a lower shell of the accumulator, and a tip of an opening thereof protrudes into the accumulator so that the lower part of the accumulator is protruded. A refrigerant return space at the bottom of the protruding portion, the refrigerant inflow pipe is connected downward to the upper shell of the accumulator, and the refrigerant outflow pipe and the refrigerant inflow pipe are arranged in a vertical direction. Accumulator for cooling and heating cycle arranged so as not to overlap with 2. A vertical cylindrical accumulator having upper and lower shells, a plurality of compressors, a refrigerant outlet pipe provided for each of the compressors, and for sending a refrigerant from the accumulator to each of the compressors, At least one refrigerant inflow pipe for flowing refrigerant from each compressor to the accumulator, the refrigerant outflow pipe is connected downward to an upper shell of the accumulator, and the refrigerant inflow pipe is connected to a lower shell of the accumulator. A cooling / heating cycle accumulator that is connected upward, protrudes into the accumulator, forms a liquid refrigerant accommodating space below the accumulator, and is arranged so that the refrigerant outflow pipe and the refrigerant inflow pipe do not overlap in the vertical direction. 3. The accumulator for a cooling and heating cycle according to claim 2, wherein the refrigerant outlet pipe has a tip end of an opening projecting into the accumulator. 4. The accumulator for a cooling and heating cycle according to claim 2, further comprising a baffle plate for blocking a line of sight between the refrigerant outflow pipe and the refrigerant inflow pipe. 5. A vertical cylindrical accumulator having upper and lower shells, a plurality of compressors, a refrigerant outlet pipe provided for each of the compressors, and for sending a refrigerant from the accumulator to each of the compressors, At least one refrigerant inflow pipe for flowing refrigerant from each compressor to the accumulator, the refrigerant outflow pipe is connected to the accumulator body from the side, and a tip of an opening thereof projects into the accumulator, An accumulator for a cooling and heating cycle, wherein the inflow pipe is connected upward to a lower shell of the accumulator, and a leading end of an opening thereof protrudes into the accumulator to form a liquid refrigerant accommodating space below the accumulator. 6. A partition plate which divides the accumulator internal space up and down at a position below the opening of the refrigerant outflow pipe and below the opening of the refrigerant inflow pipe inside the accumulator body, 6. The accumulator for a cooling and heating cycle according to claim 5, wherein a communication hole through which the liquid refrigerant flows is provided between the partition plate and the refrigerant inflow pipe. 7. A partition plate for vertically dividing an internal space of an accumulator is provided near an opening of a refrigerant inflow pipe protruding into the accumulator, and a liquid refrigerant flows between the partition plate and an inner peripheral portion of the accumulator body. 6. The accumulator for a cooling and heating cycle according to claim 5, wherein a communication hole is provided to allow the communication hole. 8. A vertical cylindrical accumulator having upper and lower shells, a plurality of compressors, a refrigerant outlet pipe provided for each of the compressors, and for sending a refrigerant from the accumulator to each of the compressors, At least one refrigerant inflow pipe through which refrigerant flows from each compressor to the accumulator, wherein the refrigerant outflow pipe and the refrigerant inflow pipe are connected upward to a lower shell of the accumulator, and a tip end of an opening of each pipe is formed inside the accumulator. And a liquid refrigerant accommodating space is formed below the accumulator, and an oil return hole is provided below the refrigerant outlet pipe protruding portion. 9. The cooling / heating cycle accumulator according to claim 1, wherein an opening of the refrigerant inflow pipe is gently widened.