JPH08110127A - Accumulator for refrigerating cycle and production thereof - Google Patents

Abstract

PURPOSE: To obtain the title accumulator wherein the separation of gas and liquid can be well performed, a pressure loss is low, and refrigerating capacity can be sufficiently displayed. CONSTITUTION: As one component in a refrigerating cycle which is so composed that a compressor 1, an oil separator 2, a condenser 3, a throttle device 4, an evaporator 5 and an accumulator 20 are connected by piping, the accumulator 20 is used. In a vessel for the accumulator 20, a partition plate 21 is provided, the vessel is divided into a first chamber 22 and a second chamber 23, and an communicating opening part 28 is formed at the upper part of the partition plate 21. In the first chamber, a refrigerant inflow pipe 24 is provided, in the first or second chamber, a refrigerant outflow pipe 25 is provided, and in the second chamber, an oil outflow pipe 27 and an oil inflow pipe 26 are provided.

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 refrigerating cycle used for a refrigerating cycle device such as an outdoor unit of a packaged air conditioner (PAC) for a building, and a manufacturing method thereof.

[0002]

2. Description of the Related Art First, before explaining an accumulator,
The role of the accumulator in the refrigeration cycle refrigerant circuit will be described. FIG. 30 is a block diagram showing a refrigerant circuit of an outdoor unit of a building package air conditioner (PAC), for example. In the figure, 1 is a compressor, 2 is an oil separator, 3 is a condenser, 4 is a throttle device, 5 is an evaporator, 6 is a first accumulator, 7 is a second accumulator, and 8 is a first accumulator 6. And a second accumulator 7 are connected to each other, 9 is a connection pipe that connects the second accumulator 7 and the compressor 1, 10 is an oil return bypass that connects the oil separator 2 and the connection pipe 8, 11 Is an oil return device provided in the middle of the oil return bypass 10, 12 is an oil return bypass that connects the bottom of the first accumulator 6 and the connection pipe 8, 13
Is an oil return device provided in the middle of the oil return bypass 12,
Reference numeral 14 is a U-shaped pipe of the second accumulator connected to the connection pipe 9, and 15 is an oil return hole provided in the middle of the U-shaped outflow pipe.

Next, the flow of refrigerant and oil will be described. The high-temperature high-pressure gas refrigerant discharged from the compressor 1 is the oil separator 2
To separate the gas refrigerant and oil, and the gas refrigerant flows into the condenser 3. Here, the gas refrigerant exchanges heat with air or water to be condensed and liquefied, and becomes a low-pressure gas-liquid two-phase state in the expansion device 4, and flows into the evaporator 5. Here, the refrigerant exchanges heat with air or water to become a gas or a gas-liquid two-phase state having a high degree of dryness. The first accumulator 6, the connecting pipe 8, the second
Returning to the compressor 1 via the accumulator 7 and the connection pipe 9. At this time, the liquid refrigerant accumulates in the first accumulator 6 and the refrigerant is separated into gas and liquid. The oil separated by the oil separator 2 flows into the connection pipe 8 through the oil return device 11 and the oil return bypass 10, and then flows into the second accumulator 7. Oil is mixed and accumulated in the first accumulator 6 together with the liquid refrigerant. The oil and the liquid refrigerant flow into the connection pipe 8 via the oil return device 13 and the oil return bypass 12, and then the second
Flows into the accumulator 7. The oil and the liquid refrigerant accumulated in the second accumulator 7 flow into the U-shaped outflow pipe 14 through the oil return hole 15 and return to the compressor 1. Here, the oil and the liquid refrigerant accumulated in the first accumulator 6 have a dynamic pressure difference between the inside of the connection pipe 8 and the inside of the first accumulator 6 and a differential pressure due to a friction loss due to a friction loss of the gas refrigerant flowing through the connection pipe 8. , The total pressure difference of the liquid heads generated by the liquid level height of the first accumulator 6 is generated before and after the oil return device 13, and flows to the connection pipe 8. Similarly, the oil and the liquid refrigerant accumulated in the second accumulator 7 have a pressure difference due to the friction loss between the U-shaped outflow pipe 14 and the gas refrigerant flowing in the U-shaped outflow pipe 14 and the liquid in the second accumulator 7. The total pressure difference of the liquid heads generated by the surface height is generated before and after the oil return hole 15 and flows to the U-shaped outflow pipe 14.

Further, since the return oil bypass 10 is connected to the connection pipe 8, even if a large amount of surplus refrigerant is accumulated in the first accumulator 6, the oil separated by the oil separator is the first accumulator. 6, the oil concentration in the first accumulator 6 is thinned, and the oil returned from the first accumulator 6 to the second accumulator 7 is not delayed and the oil in the compressor 1 is not depleted. The oil separated in 2 immediately returns to the compressor via the second accumulator 7, and a sufficient amount of oil in the compressor 1 is secured. In addition, when the compressor 1 is stopped for a long time and is started from a state in which the liquid refrigerant is laid in the shell of the compressor 1, a large amount of the liquid refrigerant and oil in the shell is discharged. The liquid refrigerant and oil are captured, and a large amount of oil is prevented from flowing out to the condenser 3 or the like. Further, since the oil return bypass 10 is connected to the connection pipe 8, a large amount of the liquid refrigerant captured by the oil separator 2 does not directly return to the compressor 1 but once flows out to the second accumulator 7 to return the oil. Compressor 1 little by little through hole 15
Therefore, the compressor 1 can be prevented from being damaged by the sudden liquid back. Further, since the oil return bypass 10 is connected to the connection pipe 8, even if a large amount of surplus refrigerant is accumulated in the first accumulator 6, the oil captured in the oil separator 2 together with the liquid refrigerant is the first oil. It can be prevented that the oil concentration in the first accumulator 6 is reduced and the oil concentration in the first accumulator 6 is thinned, and the oil returned from the first accumulator 6 to the second accumulator 7 is delayed and the oil in the compressor 1 is exhausted.

Next, the structure of a conventional accumulator is shown in FIG.
Shown in The first accumulator 6 is a large pressure tank, and the second accumulator 7 is a smaller pressure vessel than the first accumulator. First accumulator 6
The connection pipe 8 that connects the second accumulator 7 and
Since the oil return bypass 10 is connected to the upper side and the oil return bypass 12 is connected to the lower side, such a bent pipe is formed.
Connection pipe 9 that connects the second accumulator 7 and the compressor 1, return oil bypass 12 that connects the bottom of the first accumulator 6 and the connection pipe 8, return oil provided in the middle of the return oil bypass 12 A device 13, a U-shaped pipe 14 provided in the second accumulator connected to the connection pipe 9 and an oil return hole 15 provided in the middle of the U-shaped outflow pipe are shown. Incidentally, 16 is an upper liquid level detection circuit, and 17 is a lower liquid level detection circuit.

[0006]

Since the conventional accumulator for the refrigeration cycle is constructed as described above,
Since the refrigerant passes through the first accumulator 6 and the second accumulator 7 in series, there is a problem that the pressure loss between the evaporator 5 and the compressor 1 is large and the refrigerating capacity cannot be sufficiently exhibited. Further, the space occupied by the first accumulator 6, the second accumulator 7, and the connecting pipe 8 is large, a long connecting pipe 8 is required, and two pressure vessels are also required, so the manufacturing cost is high, and the brazing point is further increased. However, there was also the problem of lack of reliability.

The present invention has been made in order to solve the above-mentioned problems, and can secure the gas-liquid separation characteristic, the oil return characteristic and the liquid back characteristic, and particularly the first accumulator 6 and the second accumulator. The pressure loss when passing through 7 is small, as a result, the pressure loss from the evaporator 5 to the compressor 1 is small as a whole, the refrigerating capacity can be sufficiently exhibited, the space occupied by the accumulator and the like is small, and the brazing location is small. It is an object of the present invention to obtain an accumulator for a refrigerating cycle which has a low reliability and a sufficient reliability.

[0008]

An accumulator for a refrigeration cycle according to the present invention corresponds to a first chamber corresponding to a first accumulator by providing a partition plate in one pressure vessel and a second accumulator. And a communication hole portion that connects the two chambers is provided on the upper side of the partition plate, and a refrigerant inflow pipe through which the refrigerant flows into the first chamber is provided.
A refrigerant outflow pipe through which a refrigerant flows out is provided in the first chamber or the second chamber, and an oil inflow pipe connected to an oil separator and an oil outflow pipe connected to a compressor are provided in the second chamber. Is.

Further, an outflow pipe through which the refrigerant flows out is provided between the refrigerant inflow pipe and the partition plate, and a lower end of a communication hole provided in the partition plate is provided above an end of the refrigerant inflow pipe and an end of the oil inflow pipe. The refrigerant inflow pipe and the refrigerant outflow pipe are provided at least as large as the diameter of the refrigerant inflow pipe, and the refrigerant outflow pipe end is provided near the inner circumference of the container.

Further, the refrigerant inflow pipe is provided with a refrigerant inflow speed reducing means for reducing the inflow speed of the refrigerant.

Further, the tip of the refrigerant inflow pipe is cut obliquely.

Further, it is provided with wall surface transmission means for allowing the inflowing refrigerant to flow along the inner wall of the accumulator container.

The tip of the refrigerant inflow pipe is directed in the direction opposite to the direction of the partition plate, and is further directed toward the shoulder of the accumulator container.

Further, the communication hole portion of the partition plate is provided with a liquid refrigerant transmission preventing means for preventing the liquid refrigerant flowing from the refrigerant inflow pipe from directly flowing into the second accumulator side.

Further, the liquid refrigerant transmission preventing means is one in which the communication hole portion of the partition plate is cut and raised to the first chamber side.

Further, an upper liquid level detector capable of detecting the presence or absence of the refrigerant is attached to the liquid refrigerant transmission preventing means provided so as to project on the first room side.

Further, the upper liquid level detecting pipe of the first chamber is installed below the communication hole.

Further, a temperature detector is provided on the oil outflow pipe to the compressor suction port provided at the bottom of the second chamber so as to detect the presence / absence of refrigerant inflow from the first chamber to the second chamber. It is the one.

Further, the lower liquid level detection circuit is attached to the second oil outflow pipe to the compressor suction port provided at the bottom of the first chamber.

Further, the accumulator container is made up of three pieces of a mirror plate and a copper part, and all holes for piping required for the integrated accumulator are gathered in the body plate.

In the horizontal accumulator,
In the part of the partition plate that divides the first room and the second room,
The container is composed of two pieces divided into two, and the two shells and the partition plate are at the same welding position.

Further, in the horizontal accumulator,
A rib is provided on a partition plate that divides the first chamber and the second chamber, and the collar is overlapped with the outer circumference of the container 1 and the fitting portion of the second container shorter than the flange is overlapped with the outer circumference, and three ribs are simultaneously formed. It is to be welded.

Further, in the horizontally placed two-piece accumulator, the three are welded simultaneously while the first container and the second container are pressed against each other.

Further, the partition plate for dividing the first chamber and the second chamber is formed to have a tapered brim.

[0025]

In the accumulator constructed as described above, the same operation as in the case where there are two accumulators is performed, and the function of separating the gas and liquid of the refrigerant and storing the refrigerant and the liquid refrigerant having a high oil concentration are supplied to the compressor. Return. At that time, the pressure loss of the gas refrigerant passing through the accumulator becomes smaller than before, and the installation space also becomes smaller.

Further, since the tip ends of the refrigerant inflow pipe and the oil inflow pipe are made lower than the lower end of the communication hole, the liquid is passed directly between the first chamber and the second chamber beyond the partition plate. The amount of refrigerant or oil flowing in is reduced.

Further, since the refrigerant inflow pipe is provided with the refrigerant inflow speed reducing means, the speed of the inflowing refrigerant is reduced, the inflowing liquid refrigerant is less likely to scatter, and the liquid surface of the liquid refrigerant accumulated in the first chamber is reduced. Can be stabilized, and the liquid refrigerant can be prevented from flowing out to the refrigerant outflow pipe.

Further, since the cut end at the tip of the refrigerant inflow pipe is cut obliquely, the speed of the inflowing liquid refrigerant is reduced, and the amount of the refrigerant bouncing against the inner wall of the accumulator is reduced. It is possible to prevent the amount of liquid refrigerant accumulated in the accumulator No. 1 from directly hitting the liquid surface and prevent the liquid refrigerant from flowing out to the refrigerant outflow pipe.

Further, since the refrigerant inflow pipe is provided with the wall surface transmitting means of the accumulator, the inflowing liquid refrigerant can flow along the inner wall of the accumulator container, and the liquid surface of the liquid refrigerant accumulated in the first accumulator can be removed. The amount of direct tapping is reduced, and the liquid refrigerant does not flow directly into the refrigerant outlet pipe or the communication hole of the partition plate.

Further, as the wall surface transmission means, since the pipe tip of the refrigerant inflow pipe is directed in the direction opposite to the partition plate and further toward the shoulder of the accumulator container, the inflowing liquid refrigerant flows along the inner wall of the accumulator container. The liquid refrigerant does not flow directly into the refrigerant outlet pipe or the communication hole of the partition plate.

In the lower part of the communication hole of the partition plate, the first
Since the liquid-refrigerant transmission preventing means protruding from the room is provided, it is possible to prevent the liquid refrigerant accumulated in the first accumulator from being blown up and directly passing through the communication hole.

Further, as the liquid refrigerant transmission preventing means, the one in which the communication hole of the partition plate is cut and raised to the first chamber side is provided, so that the liquid refrigerant accumulated in the first accumulator is blown up. , Prevents passing directly through the communication hole.

Further, since the upper liquid level detecting pipe is attached to the liquid refrigerant transmission preventing means, the upper liquid level detecting pipe can be firmly fixed without newly providing a special member.

Further, since the upper liquid level detecting pipe is provided below the communicating hole, the liquid is detected before the refrigerant passes through the communicating hole from the first accumulator to the second accumulator even when the flow velocity is high. Can detect faces.

Further, a temperature detector is provided on the oil outflow pipe to
When the liquid refrigerant flows from the room to the second room, the temperature detected by the temperature detector decreases, and the inflow of the refrigerant is detected, so that the upper liquid level detection tube can function.

Since the second oil outflow pipe is provided at the bottom of the first chamber and the liquid level detection circuit is attached to the second oil outflow pipe, the second oil outflow pipe is connected to the lower liquid level detection pipe. Can be shared with.

Further, since the accumulator has the three-piece construction of the end plate and the body portion at both ends, the assembling and joining work can be performed from one direction and the processing time is shortened.

Further, since the accumulator container is divided into two parts at the partition plate part that divides the first chamber and the second chamber, and the container and the partition plate are at the same welding position, airtight work can be performed by one welding. Is completed.

Further, since the partition plate is provided with a collar, the collar is overlapped with the outer circumference of the first accumulator container, and the fitting portion of the second accumulator container shorter than the collar is overlapped with the outer circumference of the first accumulator container. The airtight work is completed by welding and the airtightness of the partition plate can be secured.

Further, since the first accumulator container and the second accumulator container are pressed against each other to be assembled by welding, spatter does not enter during welding.

Further, since the partition plate has a tapered collar on the outer circumference, the outer diameter of the brim tip is larger than the inner diameter of the accumulator container, and the outer diameter of the flat portion of the partition plate is smaller than the inner diameter of the accumulator container. The positioning of the partition plate becomes easy at the time of assembly, and the bottom part of the partition plate can be welded easily.

[0042]

【Example】

Example 1. 1 is a sectional side view of an accumulator of an outdoor unit for a refrigeration cycle according to an embodiment of the present invention. In this embodiment, 20 is an accumulator container, 21 is a partition plate that divides the accumulator container into two chambers, 22
Is the first room corresponding to the conventional first accumulator,
23 is a second chamber corresponding to the conventional second accumulator, 24 is a refrigerant inflow pipe provided in the first chamber 22, 25 is a refrigerant outflow pipe provided in the first chamber 22, and 26 is An oil inflow pipe provided in the second chamber 23,
27 is an oil outflow pipe provided at the bottom of the second chamber 23, and 28 is a communication hole provided in the partition plate 21 that connects the first chamber 22 and the second chamber 23.

FIG. 2 is a block diagram showing a refrigerant circuit of a building package air conditioner (PAC) outdoor unit according to Embodiment 1 of the present invention. In the figure, 1, 2, 3, 4, 5,
Reference numeral 11 is the same as the conventional refrigerant circuit shown in FIG. 10, and the description thereof is omitted here. 20 is an integrated accumulator, 21 is a partition plate that divides the inside of the accumulator 20 into two, 22 is a first chamber in the accumulator 20 that is partitioned by the partition plate 21, and 23 is a partition plate 21.
A second room inside the accumulator 20 partitioned by
24 is a refrigerant inflow pipe that flows into the first chamber 22 in the accumulator 20 from the evaporator 5, 25 is a refrigerant outflow pipe that connects the compressor 1 and the first chamber 22 in the accumulator 20, and 26 is an oil separator 2 and the second chamber 23 in the accumulator 20 are connected to each other by an oil inflow pipe, and 27 is the second chamber 2
3 is an oil outflow pipe that is provided at the bottom and is connected to the middle of the refrigerant outflow pipe 25 via an oil return device 28, and 28 is the first chamber 22 and the second chamber that are provided above the partition plate 21. It is a communication hole that connects the room 23.

Next, the flow of the refrigerant and the oil when the accumulator of the present invention is used will be described. However, the operation of the same portion of the refrigerant circuit as that of the conventional refrigerant circuit is the same, and the description thereof will be omitted. In the figure, the refrigerant flowing out of the evaporator 5 is passed through a refrigerant inflow pipe 24 and then accumulator 20.
Flows into the first chamber 22 inside, and most of the gas refrigerant returns to the compressor 1 through the refrigerant outflow pipe 25 provided in the first chamber 22, and the liquid refrigerant is separated and collected in the first chamber 22. A small amount of the remaining portion flows into the second chamber 23 in the accumulator 20 through the communication hole 28 provided in the partition plate 21, and returns to the compressor 1 via the oil outflow pipe 27. That is, since only one accumulator 20 passes through the refrigerant from the evaporator 5 to the compressor 1, the pressure loss from the evaporator 5 to the compressor 1 is small. Moreover, since only the first chamber 22 is passed, the pressure loss is further reduced. Further, the oil separated by the oil separator 2 flows into the second chamber 23 in the accumulator 20 through the oil return device 11 and the oil inflow pipe 26,
It returns to the compressor 1 via the oil outflow pipe 27. Therefore, even when a large amount of surplus liquid refrigerant is accumulated in the first chamber 22 inside the accumulator 20, the oil inflow pipe 26 is not connected to the second chamber 23.
The oil separated by the oil separator 2 is connected to the
There is no concern that the oil concentration will dilute when it flows into the first chamber 22,
The oil separated by the oil separator 2 immediately returns to the compressor 1 through the second chamber 23, and sufficient oil is captured by the compressor 1. In the case where the compressor 1 is stopped for a long time and the liquid refrigerant is started up in the shell of the compressor 1,
A large amount of liquid refrigerant and oil in the shell is discharged, 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 a condenser or the like. Furthermore, since the oil inflow pipe 26 is connected to the second chamber 23 in the accumulator 20, the large amount of liquid refrigerant captured by the oil separator 2 does not directly return to the compressor 1 but is temporarily returned to the second chamber. 23, and gradually returns to the compressor 1 through the oil outflow pipe 27, high-pressure liquid compression due to a sudden liquid back does not occur, and damage to the compressor 1 can be suppressed. From the above, not only the gas-liquid separation function, the oil return function and the liquid back function can be secured, but also the space is saved and there are few brazing points, the pressure loss from the evaporator 5 to the compressor 1 can be reduced, and the refrigerating capacity is improved. It is possible to obtain the accumulator of the outdoor unit for the refrigeration cycle that is sufficiently effective.

Example 2. The accumulator of the outdoor unit for the refrigeration cycle shown in FIG. 1 is a horizontal one, but as shown in FIG. 3, a vertical one can also perform the same function.

Example 3. In the embodiment shown in FIG. 1, the outflow pipe 25 is provided above the first chamber 22 in the accumulator 20, but as shown in FIG.
3 may be provided. With the configuration as shown in FIG. 3, the pressure loss from the evaporator 5 to the compressor 1 increases by the amount of passage through the communication hole 28 provided in the partition plate 21, but some defect causes the excess refrigerant to communicate. Even if it accumulates to the extent that it overflows from the hole 28, it accumulates in the second chamber 23 for a short time, so even if such a defect occurs, a large amount of liquid refrigerant is suddenly returned to the compressor 1 and compressed. Trouble that damages the machine 1 can be prevented.

Example 4. FIG. 5 is a sectional side view of an accumulator of an outdoor unit for a refrigeration cycle according to an embodiment of the present invention. The components are basically the same as those in the embodiment of FIG. 1, but the positional relationship is defined in the present invention. 20 is an accumulator container, 21 is a partition plate that partitions the accumulator container into two chambers, and in this embodiment, a communication hole 28 having a round hole is provided above the partition plate 21. Reference numeral 22 is a first chamber, 23 is a second chamber, and 24 is a refrigerant inflow pipe provided in the first chamber 22 such that the inflow port is located below the communication hole 28, and 25 is a refrigerant inflow. A refrigerant outflow pipe located between the pipe 24 and the partition plate 21 and provided in the vicinity of the partition plate 21 so that the pipe tip hardly penetrates into the container of the accumulator 20. The refrigerant outflow pipe 25 and the refrigerant inflow pipe 24 Are separated from each other by at least the diameter of the refrigerant inflow pipe 24. Reference numeral 26 is an oil inflow pipe provided in the second chamber 23 and having an inflow port located below the communication hole 28, and 27 is an oil outflow pipe provided in the bottom of the second chamber 23. .

Next, the operation when the accumulator of the present invention is used will be described. The flow of the refrigerant and the oil is the same as that of the accumulator of the first aspect of the invention, and therefore will be omitted here. In the present invention, the refrigerant inflow pipe 24 having the above-described positional relationship prevents the liquid refrigerant from directly entering the second chamber 23 through the refrigerant inflow pipe 24, thereby reducing the oil concentration in the second chamber. Never. In addition, since the oil inflow pipe has the above-described positional relationship, oil does not directly enter the first chamber 22 from the oil inflow pipe 26, and the oil is smoothly returned to the compressor. Further, since the distance between the liquid refrigerant liquid level accumulated in the first chamber 22 and the refrigerant outflow pipe 25 is secured and the distance between the refrigerant inflow pipe 24 and the refrigerant outflow pipe 25 is secured, the direct refrigerant inflow pipe 24 Since the inflowing liquid refrigerant can be prevented from flowing out to the refrigerant outflow pipe 25, the first chamber 22
The gas-liquid separation efficiency in can be improved. Further, since the refrigerant outflow pipe 25 and the communication hole portion 28 are in the above-described positional relationship, when some abnormality occurs and the liquid refrigerant has accumulated to the full extent of the first chamber 22, the liquid refrigerant is directly supplied to the compressor 1. The function of letting the liquid refrigerant escape to the second chamber 23 without returning it can be ensured.
The positional relationship between the respective pipe tips of the refrigerant inflow pipe 24 and the oil inflow pipe 26 and the lower end of the communication hole 28 described in the present embodiment, the distance relationship between the refrigerant inflow pipe 24 and the refrigerant outflow pipe 25, and the refrigerant outflow pipe. It is desirable to have all of the installation positions of the lower end of 25, etc., but it is natural that each operation and effect can be obtained even if appropriately selected from these and implemented.

FIG. 6 is a sectional view showing in detail the connection of the refrigerant outflow pipe 25 to the accumulator 20 in FIG. In this figure, 20 is an accumulator, 25 is a refrigerant inflow pipe, 30 is a boss that has been previously brazed (brazing part 31) with the refrigerant outflow pipe 25, and this boss 30 has a large chamfer at the inlet. The refrigerant outlet pipe 25 is brazed 31 above the chamfer. The boss 30 integrated with the refrigerant outlet pipe 25 is attached to the accumulator 20.
It is welded to 32.

As shown in this figure, if the refrigerant outflow pipe 25 is attached to the accumulator 20, the maximum distance between the liquid refrigerant liquid level accumulated in the first chamber 22 and the refrigerant outflow pipe 25 can be secured, and the boss 30 can be formed. Since it projects to the inner surface of the container of the accumulator 20, the liquid refrigerant is prevented from entering the refrigerant outflow pipe 25 along the inner wall of the accumulator container 20. Further, since the inlet of the boss 30 is chamfered, the refrigerant in the vapor phase smoothly flows into the refrigerant outlet pipe 25.
And the pressure loss is small.

Similarly, FIG. 7 shows an oil outflow pipe 27 in FIG.
FIG. 6 is a cross-sectional view showing the connection of the to the accumulator 20. In this figure, 20 is an accumulator, 27 is an oil outflow pipe, 33 is a boss that has been previously brazed (brazing part 34) to the oil outflow pipe 27, and this boss 33 has a large chamfer at the entrance, The oil outflow pipe 27 is brazed (brazing part 34) below the chamfer. The boss 33 integrated with the oil outflow pipe 28 is attached to the accumulator 20.
Are welded to each other (welded portion 35).

If the oil outflow pipe 27 is attached to the accumulator 20 as shown in this figure, the oil accumulated in the second chamber 23 will surely flow into the oil outflow pipe 27, and the boss 3
Since 0 does not protrude to the inner surface of the container of the accumulator 20, oil is prevented from remaining at the bottom of the second chamber 23. Further, since the inlet of the boss 30 is chamfered, the oil smoothly passes through the oil outflow pipe 27 and the flow loss is small.

Example 5. FIG. 8 is a sectional side view of the refrigerant inflow pipe portion of the accumulator of the outdoor unit for the refrigeration cycle according to the embodiment of the present invention. In the figure, reference numeral 36 denotes a refrigerant inflow pipe whose tip is expanded like a trumpet, 37 denotes a boss for fixing the refrigerant inflow pipe 36 to the container of the accumulator 20, and 22
Is a first room in the accumulator 20. The refrigerant inflow pipe 36 is fixed to the boss 37 by brazing or the like, and the hole of the accumulator 20 container into which the boss 37 fits is set to a diameter such that the refrigerant inflow pipe 36 bent in a trumpet shape can be inserted. The boss 37 integrated with the pipe 36 is fixed to the accumulator 20 container by welding or the like.

In FIG. 8, the tip end of the refrigerant inflow pipe 36 is widened like a trumpet to reduce the speed of the inflowing liquid refrigerant, and to prevent the splashing of the liquid droplets of the refrigerant in the refrigerant inflow pipe 36. The amount of refrigerant that bounces off the inner surface of the accumulator container is reduced, and gas-liquid separation efficiency is improved.

Example 6. In addition, FIG. 9 also shows another embodiment in which the same operational effect as that of the fifth embodiment is obtained. In the figure, 38 is a refrigerant inflow pipe, 39 is a fine mesh attached to the tip of the refrigerant inflow pipe 38, 40 is a boss for fixing the refrigerant inflow pipe 38 to the accumulator 20 container,
22 is a first room in the accumulator 20. The refrigerant inflow pipe 38 is fixed to the boss 40 by brazing,
The hole of the accumulator 20 container into which the boss 40 fits is set to have a diameter that allows insertion even if the wire net 39 is fixed to the tip of the refrigerant inflow pipe 38 by spot welding or the like. The boss 40 integrated with 38 is fixed to the accumulator 20 container by welding or the like.

In FIG. 9, a wire mesh 39 is attached to the tip of the refrigerant inflow pipe 38, and the flow-in speed of the inflowing refrigerant is reduced due to the resistance of the wire mesh 39. Therefore, the pressure loss increases, but the speed of the inflowing liquid refrigerant decreases,
It is possible to prevent the liquid droplets of the refrigerant from scattering in the refrigerant inflow pipe 38 and improve the gas-liquid separation efficiency.

Example 7. Further, FIG. 10 also shows another embodiment in which the same operational effects as those of the fifth and sixth embodiments are obtained. In the figure, 41 is a refrigerant inflow pipe, 42 is a plate attached to the tip of the refrigerant inflow pipe 41, 40 is a boss for fixing the refrigerant inflow pipe 41 to the accumulator 20 container, and 22 is the first in the accumulator 20. It is a room.
The refrigerant inflow pipe 41 is fixed to the boss 43 by brazing, and the hole portion of the accumulator 20 container into which the boss 43 fits is inserted even if the plate 42 is fixed to the tip of the refrigerant inflow pipe 41 by spot welding or the like. The boss 43, which is set to a diameter that can be used and is integrated with the refrigerant inflow pipe 41 to which the plate 42 is fixed, is fixed to the accumulator 20 container by welding or the like.

In FIG. 10, the inflowing refrigerant once collides with the plate 42 attached to the tip of the refrigerant inflow pipe 41 and loses its speed due to the collision. As a result, although the pressure loss increases, the amount of refrigerant that bounces off the inner surface of the accumulator container is reduced, and the gas-liquid separation efficiency is improved.

As described above, in the fifth, sixth and seventh embodiments, by providing the refrigerant inflow speed reducing means for reducing the inflow speed of the refrigerant in the refrigerant inflow pipe, it is possible to prevent the scattering of the liquid droplets of the refrigerant in the refrigerant inflow pipe portion. In addition, the amount of refrigerant that bounces off the inner surface of the accumulator container is reduced, and the gas-liquid separation efficiency is improved. In addition to this, if a structure for reducing the inflow speed of the refrigerant is provided, the same effect can be obtained.

Example 8. FIG. 11 (a) is a sectional side view of the refrigerant inflow pipe portion of the accumulator of the outdoor unit for a refrigeration cycle according to the embodiment of the present invention (for the overall view, refer to FIG. 1 or FIG. 5). FIG. 11B is a refrigerant inflow pipe portion of the accumulator viewed from the B direction. In the figure, 20 is an accumulator, 22 is a first chamber, 44 is provided in the accumulator 20, is bent in the direction opposite to the direction of the partition plate 21 (not shown), and has its tip cut obliquely. Reference numeral 37 is a pipe, 37 is a boss for fixing the refrigerant inflow pipe 24 to the accumulator 20 container, 43 (a) is a droplet of the inflowing refrigerant, and 43 (b) is a liquid refrigerant accumulated in the first chamber 22. is there.

In this embodiment, the cross-sectional area of the outlet of the refrigerant inflow pipe 44 is increased by cutting the tip of the refrigerant inflow pipe 44 obliquely, and the speed of the inflowing refrigerant droplets 43 (a) is reduced. ing. Further, since the tip of the refrigerant inflow pipe 44 is cut obliquely, the viscosity of the refrigerant itself makes the inflow direction oblique, and the refrigerant flows along the wall surface of the accumulator 20 inside the container. In this way, the inflowing refrigerant droplets 43
By reducing the speed of (a), the rebound on the wall surface of the accumulator 20 is mitigated, and a flow is generated in the container of the accumulator 20.
(A) is prevented from scattering and the liquid surface 43 (b) of the refrigerant accumulated in the first chamber 22 is stabilized to improve the gas-liquid separation efficiency of the first chamber 22.

Example 9. FIG. 12 (a) is a sectional side view of the refrigerant inflow pipe portion of the accumulator of the outdoor unit for the refrigeration cycle according to the embodiment of the present invention (for the overall view, refer to FIG. 1 or 5). FIG. 12B is a refrigerant inflow pipe portion of the accumulator viewed from the B direction. In the figure, 20 is an accumulator, 22 is a first chamber, 24 is a liquid bent in a direction opposite to a direction of a partition plate 21 (not shown) provided in the accumulator 20, and the liquid accumulated in the first chamber 22. A refrigerant inflow pipe bent to be parallel to the liquid surface 43 (b) of the refrigerant, 37 is a boss for fixing the refrigerant inflow pipe 24 to the container of the accumulator 20, 43 (a)
Is a liquid droplet of the inflowing refrigerant, and 43 (b) is the first chamber 2
It is the liquid refrigerant accumulated in 2.

By arranging the coolant inflow pipe 24 in such a shape and orientation, the coolant 43 (a) which has become liquid droplets does not flow directly into the coolant outflow pipe 25 and the communication hole portion 28 of the partition plate 21. The gas-liquid separation efficiency of the first chamber 22 is improved, and the refrigerant flowing directly into the second chamber 23 can be reduced.
3 does not dilute the oil concentration. In addition, the droplet 43
(A) flows along the inner wall of the shell of the accumulator 20, and by generating such a flow in the container of the accumulator 20, rebound on the wall surface of the accumulator 20 is mitigated and the refrigerant 43 (a) is prevented from scattering. , The refrigerant liquid level 43 (b) accumulated in the first chamber 22 is stabilized, and the gas-liquid separation efficiency of the first chamber 22 is improved.

Example 10. FIG. 13A is a sectional side view of a refrigerant inflow pipe portion of a vertical accumulator of an outdoor unit for a refrigeration cycle according to an embodiment of the present invention (for an overall view, see FIG. 3). FIG. 13B is a refrigerant inflow pipe portion of the accumulator viewed from the B direction. In the figure, 20 is an accumulator, 22 is a first room, 23 is a second room, 24
Is a refrigerant inflow pipe provided in the accumulator 20, bent in a direction opposite to the direction of the partition plate 21, and a spot-welded plate 45 bent obliquely at the tip, 25 is a refrigerant outflow pipe, and 26 is an oil outflow pipe. Reference numeral 37 denotes an inflow pipe, 37 denotes a boss for fixing the refrigerant inflow pipe 24, the refrigerant outflow pipe 25, and the oil inflow pipe 26 to the accumulator 20 container, 43 (a) is a droplet of the inflowing refrigerant, and 43 (b) is It is the liquid refrigerant accumulated in the first chamber 22.

As in this embodiment, by providing the plate 45 bent in an oblique direction at the tip of the refrigerant inflow pipe 24, the inflow direction of the inflowing refrigerant droplets 43 (a) is changed obliquely,
Similar to the above-described embodiment, a flow is formed along the wall surface in the accumulator 20 container, and the same effect is obtained. In this embodiment, the vertical placement is described, but the same effect can be obtained with a horizontal placement accumulator. Further, the same effect can be obtained by applying the refrigerant inflow pipe 44 having the tip of FIG. 11 cut obliquely to a vertical accumulator.

Example 11. FIG. 14A is a cross-sectional side view of the refrigerant inflow pipe portion of the horizontal accumulator of the outdoor unit for a refrigeration cycle according to the embodiment of the present invention (for the overall view, refer to FIG. 1 or 5). FIG. 14B is a refrigerant inflow pipe portion of the accumulator viewed from the B direction. In the figure, 2
0 is an accumulator, 22 is a first chamber, 24 is provided in the accumulator 20, and a partition plate 21 (not shown)
Is a refrigerant inflow pipe which is bent in the direction opposite to the direction and whose tip is attached in a direction toward the shoulder of the accumulator 20, and 37 is a boss for fixing the refrigerant inflow pipe 24 to the container of the accumulator 20, 43 (A) is a droplet of the refrigerant that has flowed in, and 43 (b) is a liquid refrigerant that has accumulated in the first chamber 22.

In this embodiment, since the tip end of the refrigerant inflow pipe 24 is directed in the opposite direction of the partition plate 21 and the shoulder portion of the accumulator 20, the refrigerant droplet 43 (a) is formed on the wall surface in the container of the accumulator 20. Flow along. By generating such a flow in the container of the accumulator 20, the rebound on the wall surface of the accumulator 20 is mitigated, the refrigerant 43 (a) is prevented from scattering, and the refrigerant liquid level 43 (b) accumulated in the first chamber 22 is reduced. ) Stabilization of the first room 2
The gas-liquid separation efficiency of 2 is improved. Further, the refrigerant outflow pipe 2
5, the refrigerant 43 (a) that has become a droplet does not flow directly into the communication hole portion 28 of the partition plate 21, so that the gas-liquid separation efficiency of the first chamber 22 is improved and flows directly into the second chamber 23. Refrigerant can also be reduced.

Example 12 FIG. 15 (a) is a sectional side view of a refrigerant inflow pipe portion of a vertical accumulator of an outdoor unit for a refrigeration cycle according to an embodiment of the present invention (for an overall view, refer to FIG. 3). FIG. 15B is a refrigerant inflow pipe portion of the accumulator viewed from the B direction. In the figure, 20 is an accumulator, 22 is a first room, 23 is a second room, 24
Is provided in the accumulator 20, is bent in the direction opposite to the direction of the partition plate 21, and has the tip end of the accumulator 2
0 is a refrigerant inflow pipe directed in the tangential direction of the inner wall,
5 is a refrigerant outflow pipe, 26 is an oil inflow pipe, 37 is a boss for fixing the refrigerant inflow pipe 24, the refrigerant outflow pipe 25, the oil inflow pipe 26 to the accumulator 20 container, 43 (a) is the inflowing refrigerant , 43 (b) is the liquid refrigerant accumulated in the first chamber 22.

As in this embodiment, since the tip of the refrigerant inflow pipe 24 is directed in the opposite direction of the partition plate 21 and the tip is directed in the tangential direction of the inner wall of the accumulator 20, the droplet 43 (a) of the inflowing refrigerant. The inflow direction of) is inclined, and a flow that follows the wall surface inside the accumulator 20 container is created as in the above embodiment, and the same effect is obtained.

Example 13 FIG. 16 is a sectional side view of the accumulator of the outdoor unit for the refrigeration cycle according to the embodiment of the present invention. The components are the same as in the embodiment of FIG. 1, and the same symbols represent the same components. 20 is an accumulator container,
Reference numeral 21 denotes a partition plate that partitions the accumulator container into two chambers, and in this embodiment, a communication hole portion 28 having a round hole is provided above the partition plate 21. 45 is a partition plate 2
A refrigerant blocking plate which is a liquid refrigerant transmission preventing means provided below the communication hole 28 of No. 1, 22 is a first chamber, and 23 is a second chamber.
Chamber, 24 is a refrigerant inflow pipe provided in the first chamber 22, 25 is a refrigerant outflow pipe, 26 is an oil inflow pipe provided in the second chamber 23, and 27 is a bottom portion of the second chamber 23. Is an oil outflow pipe provided in.

In this embodiment, the communication hole 28 of the partition plate 21 is used.
Since the refrigerant blocking plate 45 is provided on the lower side of the first room 2
It is possible to prevent the droplet 43 (a) of the refrigerant blown up from No. 2 from directly flowing into the second chamber 23 and prevent the oil concentration in the second chamber 23 from decreasing.

Example 14 FIG. 17 is a sectional side view of an accumulator of an outdoor unit for a refrigeration cycle according to an embodiment of the present invention. The components are the same as in the embodiment of FIG. 1, and the same symbols represent the same components. 20 is an accumulator container,
Reference numeral 46 denotes a partition plate that partitions the accumulator container into two chambers. The communication hole 28 is cut out, and the notched member 47 is bent toward the first chamber 22. This constitutes the liquid refrigerant transmission prevention means. 22 is a first chamber, 23 is a second chamber, 24 is a refrigerant inflow pipe provided in the first chamber 22, 25 is a refrigerant outflow pipe, and 26 is an oil inflow provided in the second chamber 23. Tube, 27 is the second
It is an oil outflow pipe provided at the bottom of the room 23.

In this embodiment, the communication hole 28 of the partition plate 46 is
And the notched member 47 in the first chamber 22.
Since it is bent to the side, the refrigerant blocking plate 45 of the thirteenth embodiment functions in the same manner, and the refrigerant droplets 43 (a) blown up from the first chamber 22 flow directly into the second chamber 23. The oil concentration in the second chamber 23 can be prevented from decreasing.

Example 15. FIG. 18 shows an example in which the communication hole 28 of the partition plate 47 is a round hole. The communication hole 28 is cut out in a round hole shape, and the cut-out member 47 is used in the first chamber 2
Bent to side 2. This constitutes the liquid refrigerant transmission prevention means. According to this method, it is possible to easily work with a press and the productivity is improved.

The operation is similar to that of the above-described embodiment, and the first
Droplets 43 (a) of the refrigerant blown up from the room 22 of
However, it is possible to prevent the oil from directly flowing into the second chamber 23 and prevent the oil concentration in the second chamber from decreasing.

Example 16 FIG. 19 is a sectional side view of an accumulator of an outdoor unit for a refrigeration cycle according to an embodiment of the present invention. The components are similar to those of the embodiment of FIG.
The same symbols represent the same parts. 20 is an accumulator container, 46 is a partition plate that divides the accumulator container into two chambers, the communication hole portion 28 is cut out in a round hole shape,
The notched member 47 is bent toward the first chamber 22. Then, the cutout member 47 is provided with a hole for mounting an upper liquid level detection pipe 48 for detecting overflow of the refrigerant accumulated from the first chamber 22, and the upper liquid level detection pipe 48 is spot welded. It is attached by. 22 is a first chamber, 23 is a second chamber, 24 is a refrigerant inflow pipe provided in the first chamber 22, 25 is a refrigerant outflow pipe, and 26 is an oil inflow provided in the second chamber 23. The pipe, 27 is an oil outflow pipe provided at the bottom of the second chamber 23.

In this embodiment, the accumulator 2 is equipped with a sensor for detecting the overflow of the refrigerant accumulated in the first chamber 22.
It is applied when it is held in 0, and the partition plate 46
The communication hole 28 is cut out, the cut-out member 47 is bent to the first chamber 22 side, and the bent member 47 is formed.
The upper liquid level detection tube 48 is attached to the. The upper liquid level detection pipe 48 is provided with a heater for heating and a thermistor for measuring the temperature of the surface of the pipe in the middle of the pipe (not shown). When the refrigerant flows into the upper liquid level detection pipe 48, the flowing refrigerant flows into the heater. The temperature of the surface of the tube observed by the thermistor is lowered because it is vaporized and takes heat from the part, and this is used as a signal that the first chamber 22 of the accumulator 20 is overflowed with the refrigerant to the upper side. By using this signal, if refrigerant accumulates in the accumulator and is about to overflow into the second room, stop the operation to protect the compressor or display the signal using an indicator light, etc. It can be used as a guide when discharging the refrigerant. Conventionally, a long pipe is used to detect the upper liquid level, and the upper liquid level detection pipe 48 may be damaged by vibration of the liquid refrigerant 43 (b) accumulated in the first chamber 22 or the like. there were. In the present embodiment, the member 4 of the partition plate 46 that serves as the detection unit.
Since the long upper liquid level detection tube 48 can be fixed to 7,
The liquid refrigerant 43 (b) accumulated in the room 22 is not damaged by the vibration. Further, even if the upper liquid level detection tube 48 is attached to the refrigerant blocking plate 45 described in the thirteenth embodiment, it is natural that the same action and effect are exhibited.

Example 17 20 is a sectional side view of the accumulator of the outdoor unit for the refrigeration cycle according to the embodiment of the present invention. The constituent parts are almost the same as those in the embodiment of FIG. 19, and the same symbols represent the same parts. Reference numeral 20 is an accumulator container, and 46 is a partition plate in which the communication hole portion 28 is cut out in a round hole shape, and the cut-out member 47 is bent toward the first chamber 22 side. 22 is a first chamber, 23 is a second chamber, 24 is a refrigerant inflow pipe provided in the first chamber 22, 25 is a refrigerant outflow pipe, and 26 is an oil inflow provided in the second chamber 23. A pipe, 48 is an upper liquid level detection pipe, and this pipe 48
It is positioned below the communication hole.

This embodiment is applied to the case where the accumulator 20 is provided with a sensor for detecting the presence / absence of refrigerant inflow from the first chamber 22 to the second chamber 23. The sensor is provided in the first chamber 22. The upper liquid level detection tube 48 is used. By attaching the upper liquid level detection pipe to the member 47 cut out so as to be below the communication hole portion 28,
It can be detected even when bubbles are generated on the liquid surface of the first chamber 22 and the bubbles flow into the second chamber 23.

Example 18. 21 is a sectional side view of an accumulator of an outdoor unit for a refrigeration cycle according to an embodiment of the present invention. The constituent parts are almost the same as those in the embodiment of FIG. 19, and the same symbols represent the same parts. Reference numeral 20 is an accumulator container, and 46 is a partition plate in which the communication hole portion 28 is cut out in a round hole shape, and the cut-out member 47 is bent toward the first chamber 22 side. 22 is a first chamber, 23 is a second chamber, 24 is a refrigerant inflow pipe provided in the first chamber 22, 25 is a refrigerant outflow pipe, and 26 is an oil inflow provided in the second chamber 23. A pipe, 27 is an oil outflow pipe provided at the bottom of the second chamber. A temperature detector is provided in the middle of the tube 27.

In this embodiment, a thermistor 62 for measuring the temperature of the pipe surface is attached in the middle of the oil outflow pipe 27 for returning the oil accumulated in the second chamber 23 to the compressor, and the When the liquid refrigerant flows into the room No. 2, the thermistor 6
The temperature of the tube surface observed in 2 decreases, and it is possible to detect the presence or absence of refrigerant inflow. In this way, when the oil outflow pipe 27 of the second chamber 23 is provided with the temperature detector, the same operation as the upper liquid level detection pipe is performed.

Example 19 22 is a sectional side view of an accumulator of an outdoor unit for a refrigeration cycle according to an embodiment of the present invention. The constituent parts are almost the same as those in the embodiment of FIG. 19, and the same symbols represent the same parts. Reference numeral 20 is an accumulator container, and 46 is a partition plate in which the communication hole portion 28 is cut out in a round hole shape, and the cut-out member 47 is bent toward the first chamber 22 side. 48 is the upper liquid level detection tube, 22 is the first chamber, 2
3 is a second chamber, 24 is a refrigerant inflow pipe provided in the first chamber 22, 25 is a refrigerant outflow pipe, 26 is an oil inflow pipe provided in the second chamber 23, and 27 is the second Room 2
3 is an oil outflow pipe provided at the bottom of 3. 49 is the first
Is a second oil outflow pipe provided at the bottom of the room 22 of
It communicates with the compressor 1. The middle of this tube is used as the lower liquid level detection tube. 50 is a heater for vaporizing the inflowing refrigerant, 51 is a thermistor attached to the second oil outflow pipe 49, and the heater 50, the thermistor 51 and the like constitute a liquid level detection circuit. A throttle device 13 controls the amounts of oil and refrigerant returned to the compressor.

This embodiment is applied when a sensor for detecting the presence or absence of the refrigerant in the first chamber 22 is provided in the accumulator 20, and the second oil outflow pipe 49 is provided at the bottom of the first chamber 22. Is provided, and the middle of this pipe is used as a lower liquid level detection pipe. Originally, the oil outflow pipe 49 is the first
The oil accumulated in the room 22 is returned to the compressor in a small amount together with the refrigerant. The heating heater 50 is provided in the middle of the oil outflow pipe 49.
And a thermistor 51 that measures the temperature of the tube surface,
When the refrigerant accumulates in the first chamber, the flowing-in refrigerant vaporizes in the heater 50 and takes away heat. Therefore, the temperature of the tube surface observed by the thermistor 51 decreases, and the presence or absence of the refrigerant in the first chamber 22 is checked. It can be used as a signal to detect. When this signal is used to detect that there is no more refrigerant in the accumulator, the operation is stopped to protect the compressor, or the signal is displayed using an indicator light, etc. to add or release refrigerant. It can be used as a guide when doing. In this way, the second oil outflow pipe 4 for returning oil to the first chamber 22 is returned.
When 9 is provided, since it can be shared with the lower liquid level detection pipe, the number of piping parts can be reduced.

Example 20. FIG. 23 is a view showing an embodiment of the present invention, and FIG. 21 (a) is a sectional side view showing an embodiment of a three-piece accumulator before a pipe such as a refrigerant inflow pipe is connected. 21 (b) is a view of the accumulator as viewed from above. In the figure, 53
(A) is a body portion of the accumulator container, 53 (b) is a hole to which a refrigerant inflow pipe, etc., which is opened in a line on the upper surface of the body portion 53 (a) of the accumulator container, is connected, 53
(C) is a hole to which oil outflow pipes and the like opened in a line on the lower surface of the body portion 53 (a) of the accumulator container are connected, 21 is a partition plate, 28 is a communication hole part opened in the partition plate 21 , 22 is the first room, 23 is the second room, 52
Is an end plate joined to both sides of the body portion 53 (a) of the accumulator container by welding or the like.

In this embodiment, all the hole processing provided in the accumulator is collected in the body portion 53 (a) of the accumulator container, and the hole processing is performed in the body portion 53 of the accumulator container.
They are arranged in a line on the upper side and the lower side of (a). This allows
Assembly and joining work can be done from one direction, and processing time can be reduced.

Example 21. FIG. 24 is a view showing an embodiment of the present invention and is a sectional side view showing an embodiment of a two-piece structure accumulator before a pipe such as a refrigerant inflow pipe is connected. Reference numeral 54 denotes an accumulator container 1, 56 that has been deep-drawn by press working to form the first chamber 22 and an outer circumference 54 of the accumulator container 1.
The partition plate 28 fitted into the partition plate 28 is a communication hole portion provided in the partition plate 56, and 55 is the accumulator container 2 that constitutes the second chamber 23 and is fitted to the outer circumference of the partition plate 56.

In this embodiment, since the two pieces of accumulators are located at the same joining position, in the case of welding, the welding can be easily positioned and the welding can be automated easily.
It is difficult for welding spatter to enter the container during welding, and depending on the welding conditions, welding can be done at once. Further, even when joining by brazing, since the joining positions are unified, brazing can be performed at one time. As a result, the assembly and joining work time can be shortened.

Example 22. FIG. 25 is a view showing another embodiment, and is a sectional side view showing an accumulator having a two-piece structure before a pipe such as a refrigerant inflow pipe is connected. 5
Reference numeral 7 is an accumulator container 1, 59 that has been deep-drawn by press working to form the first chamber 22.
Is a partition plate fitted so as to sandwich the end of the accumulator container 1 (57), 28 is a communication hole provided in the partition plate 59, 58 is the second chamber 23, and the inner periphery of the partition plate 59 is It is the accumulator container 2 that is fitted to.

Also in this embodiment, since the joining positions of the two-piece accumulators are summarized, in the case of welding, the welding can be easily positioned and the welding can be automated easily. You can prevent intrusion. Further, even when joining by brazing, since the joining positions are unified, brazing can be performed at one time, and brazing can be performed more reliably than in the twenty-first embodiment. As a result, the assembly and joining work time can be shortened.

Example 23. FIG. 26 is a sectional side view showing a joint structure of a joint portion of an accumulator showing an embodiment of the present invention. Reference numeral 54 denotes an accumulator container 1 that has been deep-drawn by press working to form the first chamber 22, 56 denotes a partition plate provided with a collar fitted to the outer periphery 54 of the accumulator container 1, and 28 denotes this partition plate. 56
The communication hole portion 55, which is provided in the second chamber 23, is the accumulator container 2 that is fitted to the outer periphery of the partition plate 56, and the fitting portion that is the fitted portion of the accumulator container 2 is It is shorter than the brim of the partition plate 56. In this manner, the three parts are fitted together, and the three are welded at the same time to form the weld bead 60 as indicated by the dotted line.

In this embodiment, the joining positions of the two-piece accumulators are the same, and the collar provided on the partition plate 56 is overlapped with the outer circumference 54 of the accumulator container 1, and the accumulator container shorter than the brim of the partition plate 56 is provided on the outer circumference. Two
Since the fitting portions of the inner circumference 55 are overlapped and welded, in addition to the effect of the twenty-second embodiment, welding can be performed at one time, and the airtightness of the partition plate 56 that divides the first chamber 22 and the second chamber 23 is ensured. Can be secured. In order to ensure the airtightness of this portion, it is necessary to make the flange of the partition plate 56 longer than the fitting portion 55 of the accumulator container 2 (1-2 mm in the embodiment). This facilitates positioning of welding, facilitates automation of welding, makes it difficult for welding spatter to enter the container during welding, and shortens assembly and joining work time.

Example 24. FIG. 27 is a sectional side view showing the joint structure of the joint portion for explaining the method of manufacturing the accumulator according to the embodiment of the present invention. Example 2 has a basic configuration
3 and FIG. 26, and the same symbols represent the same parts, so the description thereof is omitted here. The manufacturing method of the present invention is
When welding three parts at the same time, the flange of the partition plate 56 and the accumulator container 2 (55) are fitted to the accumulator container 1 (54), and the accumulator container 1 (5
4) and the accumulator container 2 (55) are welded while being pressed, or either the accumulator container 1 (54) or the accumulator container 2 (55) is fixed by a jig or the like, and the unfixed one is pressurized. The welding is carried out by directly fixing without applying pressure, and temporarily fixing by spot welding or the like, or by fixing one side and pressurizing the other side without performing temporary fixing.

According to this embodiment, the same effect as that of the twenty-third embodiment can be obtained, and since the partition plate 56 is hard to fit into the accumulator container 1 (54) and the accumulator container 2 (55) at the time of welding, the welding spatter can be reliably carried out. It is possible to prevent the intrusion.

Example 25. FIG. 28 is a perspective view of a partition plate of the accumulator according to the embodiment of the present invention. 61
(A) is a partition plate for dividing the inside of the accumulator into a first chamber and a second chamber, and 61 (b) is the outer diameter of the tip provided on this partition plate 61 (a) is the inner diameter of the accumulator container. It is a collar that is larger and has a tapered outer surface having a smaller outer diameter than the inner diameter of the accumulator container. Reference numeral 28 is a communication hole provided in the partition plate 61 (a). FIG. 29 is a cross-sectional view showing an example in which the partition plate 61 (a) is incorporated in a horizontally placed three-piece accumulator, and the components are the same as those in the embodiment of FIG.
Since the same symbols represent the same parts, the description thereof will be omitted. In this way, the partition plate 6 with the tapered brim 61 (b)
1 (a) is pushed into the body 53 (a) of the accumulator container. At this time, the tapered flange 6 of the partition plate 61 (a)
The spring force of 1 (b) surely follows the body portion 53 (a) of the accumulator container to the position where the pushing is stopped,
The partition plate is retained. After that, the tapered flange 61 (b) of the partition plate 61 (a) is joined to the body portion 53 (a) of the accumulator container by TIG welding or the like.

According to this embodiment, the partition plate 61 (a)
Can be easily positioned, and the partition plate 61 can be used during welding.
The partition plate 61 does not give a large distortion to (a).
Even if the plate thickness of (a) is thin, welding can be performed relatively easily.

The refrigerant inflow speed reducing means described in the above embodiment, the wall surface transmitting means for transmitting the refrigerant to the wall surface, and the liquid refrigerant for preventing the liquid refrigerant in the first chamber from being transferred to the second chamber. It is natural that an accumulator having the action and effect of each means can be obtained by appropriately combining the transmission preventing means.

Further, in the above-mentioned embodiments, the present invention has been described with reference to an example of an accumulator for an outdoor unit for a refrigeration cycle, but it goes without saying that the present invention can be widely used as an accumulator for a refrigeration cycle as well as an outdoor unit. Nor.

[0098]

Since the present invention is constructed as described above, it has the following effects.

A partition plate is provided in the container of the accumulator to divide it into a first chamber and a second chamber, a communication hole is provided in the upper part of the partition plate, and a refrigerant inflow pipe is provided in the first chamber. Is equipped with a refrigerant outflow pipe in the room or the second room,
Since the oil inflow pipe and the oil outflow pipe are provided in the second chamber, the gas-liquid separation function, the oil return function and the liquid back function can be secured.
Since the number of accumulators through which the refrigerant flowing out of the evaporator returns to the compressor becomes one, the pressure loss becomes small and the refrigerating capacity can be sufficiently exhibited. Also, since there is only one accumulator, the installation space is small. Further, it is possible to obtain an accumulator for a refrigeration cycle which has few brazing points, has high reliability, is easy to assemble, and has a low manufacturing cost.

Further, since the tip ends of the refrigerant inflow pipe and the oil inflow pipe are lower than the lower end of the communication hole, the liquid is directly passed between the first chamber and the second chamber beyond the partition plate. The amount of refrigerant or oil that flows in decreases, the oil concentration in the second chamber does not diminish, and oil is smoothly returned to the compressor. Further, since the distance between the refrigerant inflow pipe and the refrigerant outflow pipe is secured, it is possible to prevent the liquid refrigerant directly flowing from the refrigerant inflow pipe from flowing out to the refrigerant outflow pipe, and the gas-liquid separation efficiency is improved.

Further, since the refrigerant inflow pipe is provided with the refrigerant inflow speed reducing means, the speed of the inflowing refrigerant can be reduced to prevent the inflowing liquid refrigerant from splashing and bouncing, so that the first accumulator can be used. The liquid surface of the accumulated liquid refrigerant can be stabilized, the liquid refrigerant can be prevented from flowing out to the refrigerant outflow pipe, and the gas-liquid separation efficiency is improved.

Further, since the cut end at the tip of the refrigerant inflow pipe is formed to be obliquely cut, the speed of the inflowing liquid refrigerant is reduced, and the amount of the liquid refrigerant that bounces against the inner surface of the accumulator is reduced, so that the inflowing liquid refrigerant is reduced. Can prevent the liquid surface of the liquid refrigerant accumulated in the first accumulator from being directly hit, so that the liquid surface of the liquid refrigerant can be stabilized and the liquid refrigerant can be prevented from flowing out to the refrigerant outflow pipe, and the gas-liquid separation can be prevented. Efficiency is improved.

Further, since the refrigerant inflow pipe is provided with the wall surface transmitting means of the accumulator, the inflowing liquid refrigerant can be prevented from directly hitting the inner wall of the accumulator and bouncing off, and the liquid refrigerant can be directly fed to the communicating holes of the refrigerant outflow pipe and the partition plate. Since it does not flow, gas-liquid separation efficiency is improved.

Further, as the wall surface transmission means, the tip of the refrigerant inflow pipe is directed in the direction opposite to the partition plate and further toward the shoulder of the accumulator container, so that the inflowing liquid refrigerant is prevented from directly hitting the inner wall of the accumulator and bouncing back. You can
Since the liquid refrigerant does not flow directly to the refrigerant outlet pipe or the communication hole of the partition plate, the gas-liquid separation efficiency is improved.

Further, at the bottom of the communication hole of the partition plate, the first
Since the liquid refrigerant transmission preventing means protruding from the room is provided, it is possible to prevent the liquid refrigerant accumulated in the first room from being blown up, directly passing through the communication hole, and flowing into the second room. Two
The oil concentration in the room can be prevented from being diluted, and a shortage of oil returned to the compressor can be prevented.

Further, as the liquid-refrigerant transmission preventing means, the one in which the communication hole of the partition plate is cut and raised to the first chamber side is provided, so that the machining can be performed without newly providing a special member. It becomes easy and can be installed at low cost, and it is possible to prevent the liquid refrigerant accumulated in the first accumulator from being blown up, directly passing through the communication hole, and flowing into the second accumulator.

Further, since the upper liquid level detection pipe is attached to the liquid refrigerant transmission preventing means, the upper liquid level detection pipe can be fixed without newly providing a special member, and the liquid refrigerant accumulated in the first accumulator can be used. There is no risk of the upper liquid level detection tube being damaged by vibration.

Further, since the upper liquid level detecting pipe is provided below the communicating hole, the first liquid level detecting pipe is
The liquid level can be detected before the refrigerant in the accumulator passes through the communication hole to the second accumulator.

Further, by providing the temperature detector in the oil outflow pipe of the second accumulator, the inflow of the liquid refrigerant from the first chamber to the second chamber can be easily performed without installing the upper liquid level detection pipe. Can be detected.

Further, since the second oil outflow pipe is provided at the bottom of the first chamber and the liquid level detection circuit is attached to the second oil outflow pipe, the second oil outflow pipe is connected to the lower liquid level detection pipe. Since it can also be used with, it is possible to save piping parts and detect liquid level.

Further, since the accumulator has a three-piece construction including the end plate and the body at both ends and the holes are all arranged in a straight line, the assembly and joining work can be performed from one direction, and the processing time can be reduced.

Further, since the accumulator container is divided into two parts at the partition plate which divides the first chamber and the second chamber, and the container and the partition plate are at the same welding position, it is possible to perform the airtight work by one welding. Is completed, processing time can be reduced.

Further, since the partition plate is provided with a collar, the collar is overlapped with the outer circumference of the first accumulator container, and the fitting portion of the second accumulator container shorter than the collar is overlapped with the outer circumference of the first accumulator container. Positioning is easy and automation is easy, and since the airtight work is completed with one welding, the processing time can be reduced.

Further, the collar of the partition plate is overlapped with the outer circumference of the first accumulator container, and the fitting portion of the second accumulator container shorter than the brim is overlapped with the outer circumference of the first accumulator container and the second accumulator container. Welding and assembly are performed while pressing the container against each other, positioning of welding is easy and easy to automate, airtight work is completed with one welding, processing time can be reduced, and spatter can be assembled during welding. it can.

Further, since the partition plate has a tapered collar on the outer circumference, the outer diameter of the brim tip is larger than the inner diameter of the accumulator container, and the outer diameter of the flat portion of the partition plate is smaller than the inner diameter of the accumulator container. The positioning of the partition plate becomes easy during assembly, and the airtight processing of the bottom part of the partition plate becomes easier.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a refrigerant circuit configuration of an outdoor unit for a refrigeration cycle according to an embodiment of the present invention.

FIG. 3 is a sectional side view of an accumulator of an outdoor unit for a vertical refrigeration cycle showing another embodiment of the present invention.

FIG. 4 is a cross-sectional side view of an accumulator of a horizontal refrigeration cycle outdoor unit according to still another embodiment of the present invention.

FIG. 5 is a sectional side view of an accumulator of an outdoor unit for a refrigeration cycle according to Embodiment 4 of the present invention.

FIG. 6 is an enlarged sectional side view showing the structure of a refrigerant outflow pipe portion according to Embodiment 4 of the present invention.

FIG. 7 is an enlarged sectional side view showing the structure of the oil outflow pipe portion according to the fourth embodiment of the present invention.

FIG. 8 is a sectional side view of a refrigerant inflow pipe portion of the accumulator according to the fifth embodiment of the present invention.

FIG. 9 is a sectional side view of a refrigerant inflow pipe portion of an accumulator showing a sixth embodiment of the present invention.

FIG. 10 is a sectional side view of a refrigerant inflow pipe portion of the accumulator showing Embodiment 7 of the present invention.

FIG. 11 is a cross-sectional side view of a refrigerant inflow pipe section of an accumulator according to an eighth embodiment of the present invention and a view as seen from a B direction.

FIG. 12 is a cross-sectional side view of a refrigerant inflow pipe portion of an accumulator according to a ninth embodiment of the present invention and a view as seen from a B direction.

13A and 13B are a cross-sectional side view of a refrigerant inflow pipe portion of a vertical accumulator showing a tenth embodiment of the present invention and a view seen from a B direction.

FIG. 14 is a cross-sectional side view of a refrigerant inflow pipe portion of an accumulator according to an eleventh embodiment of the present invention and a view as seen from a B direction.

FIG. 15 is a cross-sectional side view of a refrigerant inflow pipe portion of a vertical accumulator showing a twelfth embodiment of the present invention and a view seen from a B direction.

FIG. 16 is a sectional side view of an accumulator of an outdoor unit for a refrigeration cycle according to Embodiment 13 of the present invention.

FIG. 17 is a sectional side view of an accumulator of an outdoor unit for a refrigeration cycle according to Embodiment 14 of the present invention.

FIG. 18 is a sectional side view of an accumulator of an outdoor unit for a refrigeration cycle showing a fifteenth embodiment of the present invention.

FIG. 19 is a sectional side view of an accumulator of an outdoor unit for a refrigeration cycle according to Embodiment 16 of the present invention.

FIG. 20 is a sectional side view of an accumulator of an outdoor unit for a refrigeration cycle according to Embodiment 17 of the present invention.

FIG. 21 is a sectional side view of an accumulator of an outdoor unit for a refrigeration cycle according to Embodiment 18 of the present invention.

FIG. 22 is a sectional side view of an accumulator of an outdoor unit for a refrigeration cycle according to Embodiment 19 of the present invention.

FIG. 23 is a sectional side view and a top view showing a three-piece structure of an accumulator of an outdoor unit for a refrigeration cycle according to Embodiment 20 of the present invention.

FIG. 24 is a cross-sectional side view and a top view showing a two-piece structure of an accumulator of an outdoor unit for a refrigeration cycle according to Embodiment 21 of the present invention.

FIG. 25 is a sectional side view showing a two-piece structure of the accumulator of the outdoor unit for the refrigeration cycle according to Embodiment 22 of the present invention.

FIG. 26 is a sectional side view showing a joint structure of an accumulator of an outdoor unit for a refrigeration cycle according to Embodiment 23 of the present invention.

FIG. 27 is a sectional side view showing the joint structure of the accumulator of the outdoor unit for a refrigeration cycle according to Embodiment 24 of the present invention.

FIG. 28 is a side view of the partition plate of the accumulator according to Embodiment 25 of the present invention.

FIG. 29 is a sectional side view of the partition plate of Embodiment 25 of the present invention incorporated into an accumulator of an outdoor unit for a refrigeration cycle.

FIG. 30 is a block diagram showing a refrigerant circuit configuration of a conventional refrigeration cycle outdoor unit.

FIG. 31 is a top view and a cross-sectional side view of an accumulator of a conventional outdoor unit for a refrigeration cycle.

[Explanation of symbols]

1 Compressor, 2 Oil separator, 3 Condenser, 4 Throttling device, 5 Evaporator, 20 Accumulator container, 21 Partition plate, 22 1st chamber, 23 2nd chamber, 24 Refrigerant inflow pipe, 25 Refrigerant outflow pipe , 26 oil inflow pipe, 27
Oil outflow pipe, 28 communication holes, 30 Refrigerant inflow pipe boss, 3
1 brazing, 32 welds, 33 boss for oil outflow pipe, 3
4 Brazing part, 35 Welding part, 36 Refrigerant inflow pipe, 37
Refrigerant inflow pipe boss, 38 Refrigerant inflow pipe, 39 wire mesh,
40 Refrigerant inflow pipe boss, 41 Refrigerant inflow pipe boss, 42
Plate material, 43 (a) Refrigerant droplets, 43 (b) Liquid refrigerant, 44 Refrigerant inflow pipe, 45 Refrigerant blocking plate, 46 Partition plate, 47 Notched member, 48 Upper liquid level detection pipe, 49 Second Oil outflow pipe, 50 heater, 51 thermistor, 52 end plate, 53 (a) accumulator body,
53 (b) Pipe mounting hole, 54 Accumulator container 1, 55 Accumulator container 2, 56 Partition plate, 56
(B) Collar 57, first accumulator container, 58
Second accumulator container, 59 Partition plate, 60
Weld beads, 61 (a) partition plate, 61 (b) brim, 62 temperature detector, 70 plate.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hirofumi Takashita 6-5-6 Tehira, Wakayama City Wakayama Works, Mitsubishi Electric Corporation (72) Inventor Yoichi Kumori 8-1-1, Tsukaguchihonmachi, Amagasaki No. Mitsubishi Electric Corporation Production Technology Center (72) Inventor Masaharu Moriyasu 8-1-1 Tsukaguchi Honcho, Amagasaki City Mitsubishi Electric Corporation Production Technology Center (72) Inventor Kenji Kawaguchi 8-1-1 Tsukaguchi Honcho, Amagasaki City No. Mitsubishi Electric Co., Ltd. Production Technology Center (72) Inventor Michio Fujiwara 8-1-1 Tsukaguchihonmachi, Amagasaki City Mitsubishi Electric Co., Ltd. Production Technology Center

Claims (17)

[Claims] 1. A compressor, an oil separator, a condenser, a throttle device,
In an accumulator used in a refrigeration cycle circuit configured by connecting an evaporator and an accumulator in a pipe, a partition plate is provided in a container of the accumulator and divided into a first chamber and a second chamber, and the partition plate is provided above the partition plate. A communication hole is provided, a refrigerant inflow pipe is provided in the first chamber, a refrigerant outflow pipe is provided in the first chamber or the second chamber, and an oil outflow pipe is provided in the second chamber. An accumulator for a refrigeration cycle, which is provided with an oil inflow pipe. 2. The refrigerant outflow pipe in the first chamber is located between the refrigerant inflow pipe and the partition plate, and a pipe tip portion of the refrigerant inflow pipe in the first chamber and an oil inflow pipe in the second chamber. The pipe tip end of each of the pipes is provided so as to be lower than the lower end of the communication hole, and the refrigerant inflow pipe is provided at a position separated from the refrigerant outflow pipe by its diameter or more, and the refrigerant outflow pipe lower end of the accumulator container. The accumulator for a refrigerating cycle according to claim 1, wherein the accumulator is provided near the inner wall. 3. The accumulator for a refrigerating cycle according to claim 1, wherein the refrigerant inflow pipe is provided with a refrigerant inflow speed reducing means for reducing the inflow speed of the refrigerant. 4. The accumulator for a refrigerating cycle according to claim 3, wherein the refrigerant inflow speed reducing means has a shape in which a cut end of the refrigerant inflow pipe is obliquely cut. 5. The accumulator for a refrigerating cycle according to claim 1, wherein the refrigerant inflow pipe is provided with wall surface transmission means for allowing the refrigerant flowing into the accumulator to hang on the wall surface. 6. The wall surface transmission means is the first accumulator.
Direct the tip of the refrigerant inflow pipe in the room of the room in the direction opposite to the partition plate, and further connect the tip of the refrigerant inflow pipe to the shoulder of the accumulator container (the connection between the dome and the body of the container).
The refrigerating cycle accumulator according to claim 5, wherein the accumulator is a refrigerant inflow pipe directed to. 7. A liquid-refrigerant transmission preventing means which is provided at a lower portion of the communication hole of the partition plate so as to project toward the first chamber of the accumulator to prevent the liquid refrigerant in the first chamber from being transmitted to the second chamber. The accumulator for a refrigeration cycle according to claim 1, further comprising: 8. The liquid refrigerant transmission preventing means according to claim 7, wherein the communication hole of the partition plate in the container of the accumulator is cut and raised toward the first chamber side. Accumulator for the refrigeration cycle described. 9. The upper liquid level detection pipe capable of detecting the presence or absence of a refrigerant is attached to the liquid refrigerant transmission preventing means provided so as to project on the first room side. Accumulator for refrigeration cycle. 10. The accumulator for a refrigerating cycle according to claim 9, wherein the upper liquid level detection pipe of the first chamber is provided below the communication hole. 11. An oil outflow pipe in the second chamber is provided with a temperature detector, and the presence or absence of refrigerant inflow from the first chamber to the second chamber is detected by determining the temperature detected by the temperature detector. The accumulator for a refrigerating cycle according to claim 1, wherein: 12. A second oil outflow pipe is provided at the bottom of the first chamber to communicate with the compressor, and a second oil outflow pipe is provided in the first chamber.
The accumulator for a refrigeration cycle according to claim 1, wherein a liquid level detection circuit capable of detecting the presence or absence of a refrigerant is attached to the oil outflow pipe. 13. The refrigerating machine according to claim 1, wherein the accumulator is composed of three pieces of end plates and a body, and holes for necessary refrigerant pipes are all collected in the body. Accumulator for cycle. 14. In the horizontal accumulator, the container of the accumulator is divided into two parts at the partition plate part dividing the first chamber and the second chamber, and the container and the partition plate are at the same welding position. The accumulator for a refrigerating cycle according to claim 1. 15. A partition plate is provided with a brim, the brim of the partition plate is superposed on the outer periphery of the first accumulator container, and the fitting portion of the second accumulator container shorter than the brim is superposed on the outer periphery thereof to form three ribs. The accumulator for a refrigerating cycle according to claim 14, wherein a welded portion for simultaneously welding is formed. 16. A horizontal accumulator used in a refrigeration cycle circuit configured by connecting a compressor, an oil separator, a condenser, a throttle device, an evaporator, and an accumulator by piping, and the partition is provided in a container of the accumulator. A plate is provided and divided into a first chamber and a second chamber, a communication hole is provided in an upper portion of the partition plate, a refrigerant inflow pipe is provided in the first chamber, and the first chamber or the first chamber is provided. The second chamber is provided with a refrigerant outflow pipe, the second chamber is provided with an oil outflow pipe and an oil inflow pipe, and is a partition plate portion that divides the first chamber and the second chamber. In a horizontally placed accumulator in which the container is divided into two and the partition plate is provided with a collar,
The collar of the partition plate is overlapped on the outer circumference of the first accumulator container, the fitting portion of the second accumulator container shorter than the brim is overlapped on the outer circumference thereof, and the first accumulator container and the second accumulator container are combined. A method for manufacturing an accumulator for a refrigeration cycle, which comprises simultaneously welding while pressing each other. 17. In a horizontal accumulator, a partition plate that divides the first chamber and the second chamber has a tapered brim on the outer periphery, and the outer diameter of the brim tip is larger than the inner diameter of the accumulator container, The accumulator for a refrigeration cycle according to claim 1, wherein an outer diameter of a flat surface portion of the partition plate is smaller than an inner diameter of the accumulator container.