JP2000161808A - Refrigeration cycle device and check valve unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make efficient and miniaturize a refrigeration cycle device and an outdoor machine by integrating a plurality of check valve manifolds in an outdoor machine and a pipe for connecting the check valves in a body, abolishing a complex refrigeration pipe, reducing the number of brazed points, and reducing pressure loss. SOLUTION: In a check valve unit, a plurality of check valves that are included at a popularity of pipes in an outdoor machine, a manifold 7 where a plurality of pipes gather, and piping for connecting the check valves are integrated in a body 24. In this case, a plurality of cheek valves are successively aligned in the direction of gravity in the body and the valve body of each check valve is engaged into a plurality of opening holes being formed in the body 22. When the valve body is inserted into each opening hole, it is fixed by lids 27a-27e and lids with piping 28a-28c. Further, connectors 23a-23h to a compressor, a heat exchanger, or the like are connected to the body 22, thus eliminating complex, long piping and drastically reducing a joined part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a miniaturization mechanism of a refrigeration cycle device such as an outdoor unit of a package air conditioner (PAC) for a building in which a plurality of indoor units can be connected to one outdoor unit. is there.

[0002]

2. Description of the Related Art A refrigerating cycle device such as an outdoor unit of a package air conditioner for a building in which a plurality of indoor units can be connected to one outdoor unit will be described. FIG. 12 is a refrigerant circuit block diagram showing only an outdoor unit of a package air conditioner (PAC) for connecting a plurality of indoor units to one outdoor unit disclosed in Japanese Patent Publication No. 7-9226. is there.

The construction of the outdoor unit of the building package air conditioner (PAC) shown in FIG. 12 will be described with reference to FIG.
In the figure, 1 is a compressor, 2 is a four-way valve for switching the flow of refrigerant, 3 is a first outdoor heat exchanger, 4 is a second outdoor heat exchanger, 5 is an accumulator, 6a, 6b, 6c, 6d,
6e is an electromagnetic valve capable of flowing refrigerant bidirectionally, 7 is a manifold, 8a, 8b, 8c, 8d is a check valve for controlling the flow of refrigerant to one-way flow, 9 is a first ball valve,
Reference numeral 10 denotes a second ball valve, and reference numerals 11a and 11b denote connection pipes connected to the indoor unit. An outdoor unit is configured by connecting the refrigerant circuit parts by piping. In this figure, the indoor units are not shown and are omitted.

FIG. 13 shows the flow of the refrigerant in the outdoor unit.
This will be described with reference to FIG. FIG. 13 shows the case of the cooling operation. FIG. 14 shows the case of the heating operation. First, the flow of the refrigerant in the cooling operation will be described with reference to FIG.
The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 passes through a four-way valve 2, an electromagnetic valve 6 a connected to the first heat exchanger 3, and an electromagnetic valve 6 b connected to the second heat exchanger 4. 1 and 2 flow into the outdoor heat exchangers 3 and 4. Where the gas refrigerant is air,
Condenses and liquefies by exchanging heat with water etc. The liquid refrigerant condensed and liquefied in the first and second outdoor heat exchangers 3 and 4 is supplied to solenoid valves 6 c and 6.
d, they merge at the manifold 7, and flow out 9 from the first ball valve via the check valve 8d. At this time, the check valve 8c blocks the flow of the liquid refrigerant. The liquid refrigerant flowing out of the first ball valve 9 flows into the indoor heat exchanger (not shown) through the connection pipe 11a connected to the indoor unit. Here, the refrigerant exchanges heat with air, water, or the like, and becomes a gas or a gas-liquid two-phase state with a high dryness, thereby cooling the room. The gas or the refrigerant in the gas-liquid two-phase state having a large dryness flows into the accumulator 5 from the connection pipe 11b connected to the indoor unit, through the second ball valve 10, the check valve 8a, and the four-way valve 2. I do. At this time, the refrigerant flows into the check valve 8b, but since the pressure at the outlet of the check valve 8b connected to the manifold 7 is higher than the pressure at the inlet connected to the second ball valve, The stop valve 8b is closed.
That is, the check valve 8b does not allow the refrigerant to flow. It dams the gas or the refrigerant that has entered a gas-liquid two-phase state with a high degree of dryness. Refrigerant in gas or gas-liquid two-phase state with large dryness,
Gas-liquid separation is performed by the accumulator 5, and only the gas refrigerant returns to the compressor 1.

Next, the flow of the refrigerant in the heating operation is shown in FIG.
It is explained along. The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 flows out of the first ball valve 9 via the four-way valve 2 and the check valve 8c. At this time, the check valve 8a blocks the flow of the gas refrigerant. The high-temperature and high-pressure gas refrigerant flowing out of the first ball valve 9 flows into the indoor heat exchanger (not shown) through the connection pipe 11a connected to the indoor unit. Here, the refrigerant exchanges heat with air, water, or the like, condenses and liquefies, and heats the room. And the condensed and liquefied refrigerant is
From the connection pipe 11b connected to the indoor unit, the flow proceeds in the order of the second ball valve 10 and the check valve 8b, and reaches the manifold 7. At this time, the check valve 8d blocks the flow of the liquid refrigerant.
The first heat exchanger 3 and the second heat exchanger 4 in the manifold 7
The liquid refrigerant distributed to the first through the solenoid valves 6c and 6d,
Flows into the heat exchanger 3 and the second heat exchanger 4. Here, the liquid refrigerant exchanges heat with air, water, or the like, and enters a gas or gas-liquid two-phase state with a large dryness. The gas or the refrigerant in a gas-liquid two-phase state having a large dryness is supplied to the solenoid valves 6a, 6b,
It flows in the order of the four-way valve 2, flows into the accumulator 5, is separated into gas and liquid by the accumulator 5, and only the gas refrigerant returns to the compressor 1.

Here, switching of the heat exchanger in the cooling and heating operations will be described with reference to FIG. 13, FIG. 15, FIG. 16, and FIG. In the outdoor unit, it is possible to switch the heat exchanger in four stages according to the load on the indoor unit. The description will be made with reference to the flow of the refrigerant in the cooling operation. However, in the heating operation, only the direction of the refrigerant flowing through the first heat exchanger 3 and the second heat exchanger 4 is different, and the functionally the same as the case of the cooling. It is.

The first stage is a case where the capacity of the outdoor unit is maximum in the cooling operation state shown in FIG. This is the first,
In this case, the refrigerant flows through both heat exchangers 3 and 4 of the second heat exchanger, and the amount of heat exchange in the heat exchangers is maximized. At this time, the solenoid valves 6a, 6c connected to the first heat exchanger 3,
The solenoid valves 6b and 6d connected to the second heat exchanger 4 are open, and the bypass solenoid valve 6e is closed.

FIG. 15 shows a second stage operation. In this case, the operation capacity of the outdoor unit is half of the maximum capacity.
This is the case where the refrigerant flows into one of the first and second heat exchangers 3 and 4. For example, there is a case where the refrigerant flows only through the first heat exchanger 3 and does not flow through the second heat exchanger 4. At this time, the solenoid valves 6a and 6c connected to the first heat exchanger 3 are opened, the solenoid valves 6b and 6d connected to the second heat exchanger 4 are closed, and the bypass solenoid valve 6e Is closed. In this case, the first heat exchanger 3
Only the refrigerant flows, and the heat exchanger can reduce the heat exchange amount to half of the maximum operation capacity.

FIG. 16 shows a third stage operation. In this case, the operation capability of the outdoor unit is smaller than the second stage capability. This is the case where the refrigerant flows into one of the first and second heat exchangers 3 and 4 and the bypass solenoid valve 6e is opened to bypass the refrigerant. For example, there is a case where the refrigerant flows only through the first heat exchanger 3 and does not flow through the second heat exchanger 4, and the bypass electromagnetic valve 6e is opened to bypass the refrigerant. At this time, the solenoid valves 6a and 6c connected to the first heat exchanger 3 are opened,
The solenoid valves 6b and 6d connected to the second heat exchanger 4 are closed, and the bypass solenoid valve 6e is open. In this case, since the refrigerant flows only through the first heat exchanger 3 and bypasses the refrigerant, the flow rate of the refrigerant flowing through the first heat exchanger 3 is significantly reduced as compared with the case of the third stage. . That is, the amount of heat exchange in the first heat exchanger 3 can be significantly reduced.

FIG. 17 shows a fourth stage operation. In this case, the operation capacity of the outdoor unit is the minimum case. This is because only the solenoid valve 6e for bypass is opened to bypass the refrigerant,
This is a case where no refrigerant flows through the first and second heat exchangers 3 and 4. At this time, the solenoid valves 6a, 6c, 6b, 6d connected to the first heat exchanger 3 and the second heat exchanger 4 are closed, and the first
No refrigerant flows through the heat exchanger 3 and the second heat exchanger 4.

Next, the configuration of the outdoor unit shown in FIG. 18 will be described. This outdoor unit operates in the same manner as the conventional outdoor unit shown in FIG. The description of the same parts as in FIG. 12 is omitted. Numerals 12a, 12b and 12c denote solenoid valves which allow the refrigerant to flow only in one direction, 13 denotes a distributor for evenly distributing the liquid refrigerant to the first and second heat exchangers 3 and 4, and 8f, 8g and 8h denote refrigerant circuits. This is a newly installed check valve.

The flow of the refrigerant in the outdoor unit is shown in FIG.
This will be described with reference to FIG. FIG. 18 shows the case of the cooling operation. FIG. 19 shows the case of the cooling operation. First, the flow of the refrigerant in the cooling operation will be described with reference to FIG. The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 flows into the first and second outdoor heat exchangers 3 and 4 via the four-way valve 2, the check valve 8e, the distributor 13, and the solenoid valves 12a and 12b. At this time, the check valves 8b and 8f stop the flow of the gas refrigerant. Here, the gas refrigerant condenses and liquefies by exchanging heat with air, water and the like. The condensed and liquefied high-pressure liquid refrigerant passes through the check valves 8g and 8h, joins in the manifold 7, and passes through the check valve 8d to the first valve.
Out of the ball valve 9. At this time, the check valve 8c blocks the flow of the liquid refrigerant. The liquid refrigerant flowing out of the first ball valve 9 is supplied to the connection pipe 1 connected to the indoor unit.
Through 1a, it flows into an indoor heat exchanger (not shown). Here, the refrigerant exchanges heat with air, water, or the like, and becomes a gas or a gas-liquid two-phase state with a high dryness, thereby cooling the room. And the refrigerant which has become a gas or a gas-liquid two-phase state with a large dryness,
From the connection pipe 11b connected to the indoor unit, it flows into the accumulator 5 through the second ball valve 10, the check valve 8a, and the four-way valve 2. At this time, the check valve 8b dams the gas or the refrigerant in the gas-liquid two-phase state with a high degree of dryness. Refrigerant in gas or gas-liquid two-phase state with large dryness,
Gas-liquid separation is performed by the accumulator 5, and only the gas refrigerant returns to the compressor 1.

Next, the flow of the refrigerant in the heating operation is shown in FIG.
It is explained along. The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 flows out of the first ball valve 9 via the four-way valve 2 and the check valve 8c. At this time, the check valves 8a and 8d block the flow of the gas refrigerant. The high-temperature and high-pressure gas refrigerant flowing out from the first ball valve 9 passes through the connection pipe 11a connected to the indoor unit, and passes through the indoor heat exchanger (not shown).
Flows into. Here, the refrigerant exchanges heat with air, water, or the like, condenses and liquefies, and heats the room. The condensed and liquefied refrigerant flows from the connection pipe 11b connected to the indoor unit to the second ball valve 10 and the check valve 8b in this order, and flows through the distributor 13
Flows into. At this time, the check valve 8e blocks the flow of the liquid refrigerant. The liquid refrigerant is distributed to the first and second heat exchangers 3 in the distributor 13,
4 are evenly divided according to the size of the solenoid valves 12a,
Through 2b, it flows into the first heat exchanger 3 and the second heat exchanger 4. Here, the liquid refrigerant exchanges heat with air, water, or the like, and enters a gas or gas-liquid two-phase state with a large dryness. And the refrigerant which has become a gas or a gas-liquid two-phase state with a large dryness,
After passing through the check valves 8g and 8h, the flow proceeds in the order of the check valve 8f and the four-way valve 2, and flows into the accumulator 5. At this time, check valve 8
d and 8e stop the flow of the gas refrigerant. The gas or the refrigerant in a gas-liquid two-phase state with a large degree of dryness is separated into gas and liquid by the accumulator 5, and only the gas refrigerant returns to the compressor 1.

Next, FIG. 21 shows a cross-sectional structure of a conventional check valve. 14 is an inlet pipe, 15 is an outlet pipe, 16 is a body,
Reference numeral 17 denotes a valve body, 18 denotes a lower valve chamber, 19 denotes an upper valve chamber, and 20 denotes a sealing surface provided on the body 16. In this case, the check valve is in a closed state.

Further, the detailed structure of the valve element 17 is shown in FIG.
2, shown in FIG. FIG. 22 is a top view of the valve element 17 and FIG.
Is a sectional side view of the valve element 17. 17a is a side surface of the valve body,
And a sliding portion 17b provided on the upper portion is a sealing surface of the valve element 17.

Here, the operation of the refrigerant flowing through the inside of the check valve and the valve body will be described with reference to FIGS. 21 and 24. First, as shown in FIG.
If the check valve is closed and the pressure is higher than
Since the pressure in the outlet pipe 15 and the upper valve chamber 19 is higher than the pressure in the inlet pipe 14, a force toward the inlet pipe 14 acts on the valve element 17. As a result, the sealing surface 20 of the body 16 is closed by the sealing surface 17b of the valve body 17, so that the flow of the refrigerant is sealed, and the check valve is closed. Thus, the refrigerant does not flow from the outlet pipe 15 to the inlet pipe 14.

Next, the case where the check valve changes from the closed state to the open state shown in FIG. 24 will be described. FIG. 25 is a top sectional view of the check valve when the check valve is in the open state. Reference numeral 21 denotes a flow path formed between the valve body 17 and the sliding portion 17a and the body 16 of the check valve.

As shown in FIGS. 24 and 25, first, when the pressure of the outlet pipe 15 becomes lower than the pressure of the inlet pipe 14, the valve body 17 is pushed up by the pressure difference. At this time, since the valve element 17 is separated from the sealing surface 20 of the body 16, the refrigerant flows into the lower valve chamber 18. Then, the refrigerant flows through the flow path 21, merges in the upper valve chamber 19, and reaches the outlet pipe 15. At this time, a pressure loss occurs while the refrigerant flows through the flow path 21 formed between the sliding portion 17a of the valve body 17 and the body 16 of the check valve, and the pressure of the upper valve chamber 19 is reduced by the pressure of the lower valve chamber 18. Lower than pressure. As a result, a force toward the outlet pipe 15 always acts on the valve element 17. As a result, the valve element 17 is held in a floating state, and the check valve maintains the open state.

In the outdoor unit shown in FIG. 12, portions surrounded by a chain line are check valves 8a, 8b, 8c, 8d, first and second check valves.
Numerous refrigerant pipes and pipe joints connecting the second ball valves 9 and 10 are provided as shown in FIG. 26, and the check valves are connected to each other by brazing through refrigerant pipes. ing.

[0020]

Since the conventional refrigeration cycle apparatus is constructed as described above, it is bent into a complicated shape in order to connect a number of check valves and refrigerant circuit components such as solenoid valves. Refrigerant piping is required. Further, since a thick pipe is used to reduce the pressure loss in the pipe section, the bending radius of the pipe is increased. As a result, the area occupied by the pipe of the outdoor unit becomes large, and there is a problem that the outdoor unit of the refrigeration cycle apparatus becomes large.

Further, since the piping length of the refrigeration cycle apparatus is increased, the pressure loss is increased, and the refrigeration capacity cannot be sufficiently exhibited, resulting in a decrease in performance.

In addition, there are many types of refrigerant piping parts required for assembly, so that much time is required for joining work, and the cost is increased.

Further, since there are too many brazing points, the assemblability is poor, and there is a problem that the refrigerant is liable to leak.

The present invention has been made in order to solve the above-mentioned problems, and has a small size and a small pressure loss.
It is an object of the present invention to obtain a refrigeration cycle device having a small number of brazing points, exhibiting sufficient refrigeration or heating capacity, and having high reliability at a joint.

[0025]

According to a first aspect of the present invention, there is provided a refrigeration cycle apparatus comprising a plurality of check valves in a refrigeration cycle, and the check valves are sequentially arranged in one body in the direction of gravity. A hole for opening a valve body of a check valve in the body, a lid for inserting the valve body in the hole and being joined to the body to ensure airtightness, and piping; Fixed with a lid, aggregated so that assembly from one direction is possible, while integrating, forming a refrigerant flow path connecting the check valves provided inside the body,
By constructing a structure in which a manifold in which the refrigerant that has passed through the check valve merges is provided inside the body, complicated and long piping connecting the check valves to each other is eliminated, the number of joints is significantly reduced, and the pressure in the refrigeration cycle is reduced. The loss is reduced.

In the refrigeration cycle apparatus according to the second configuration of the present invention, a refrigerant inlet for the refrigerant flowing into the check valve is provided below the valve body of the check valve, and a refrigerant outlet for the refrigerant flowing out is provided in the lower valve chamber. The refrigerant flowing out of the check valve is provided with a refrigerant outlet in a direction perpendicular to the flowing direction of the refrigerant.

In the refrigeration cycle apparatus according to the third configuration of the present invention, in order to prevent the valve element from being caught by the refrigerant outlet provided in the upper valve chamber, a protrusion such as a spacer for regulating the moving distance of the valve element is provided. The part is provided on a valve body or a lid.

In a refrigeration cycle apparatus according to a fourth configuration of the present invention, a communication pipe for connecting the upper valve chamber, the manifold, and the refrigerant outlet is provided and connected.

In a refrigeration cycle apparatus according to a fifth aspect of the present invention, the body in which the plurality of check valves are integrated is divided into two parts, a manifold is provided in the divided part, and the divided bodies are hermetically joined. , Assembled.

In a refrigeration cycle apparatus according to a sixth configuration of the present invention, the communication pipe is provided inside a body.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 shows a refrigerant circuit of an outdoor unit of a refrigeration cycle apparatus using a check valve unit 22 according to Embodiment 1 of the present invention. The solid arrows in FIG. 1 indicate the flow of the refrigerant during the cooling operation.

FIG. 2 is a perspective view of the check valve unit in FIG. 3 is a top view of the check valve unit 25, FIG. 4 is a sectional side view showing a section AA in FIG. 3, FIG. 5 is a sectional side view showing a section BB in FIG. 3, and FIG. It is a sectional side view showing a CC section. The broken lines in FIG. 3 indicate the manifold and the flow path formed inside the check valve unit 25.

The structure of the check valve unit will be described with reference to FIGS. First, the symbols will be described. 22 is a check valve unit, 23a is a first connection part, 23b is a second connection part, 23c is a third connection part, 23d is a fourth connection part, 23e is a fifth connection part, and 23f is a fifth connection part. 6 connections, 2
3g is a seventh connecting portion. 23h is an eighth connecting portion, 2
4 is a body, 25a and 25b are a fifth connection part and a check valve 8
b, and a refrigerant passage provided inside the body 26 for communicating the manifold 7 with the check valve 8d.
Opening holes in the body 24 to accommodate the
27a, 27b, 27c, 27d, 27e are lids, 28
a, 28b, 28c are pipe-mounted lids to which pipes are attached, 29
Is a refrigerant outlet.

The check valve unit 22 includes the check valves 8a, 8b, 8c, 8d, 8g, 8 of the conventional outdoor unit shown in FIG.
The piping connecting the h, the manifold 7, and the check valve is integrated inside the body 24. Here, the internal structure of the check valve unit 25 will be described with reference to FIGS. The check valve unit 25 has check valves 8a, 8b, 8c and 8d on BB in FIG. 3 and check valves 8f, 8g and 8h on AA in FIG. It has an internal structure in which a manifold 7 is provided in the section.

Next, the flow of the refrigerant inside the check valve unit 22 when the refrigeration cycle apparatus according to the present embodiment is used will be described. The flow of the refrigerant flowing inside the check valve unit 24 during the cooling or heating operation is basically the same as the conventional outdoor unit shown in FIG.
Here, for example, the check valve 8g to the manifold 7 and the check valve 8d in the cooling operation of the conventional outdoor unit shown in FIG.
, The flow flowing to the first ball valve 9 will be described. In FIG. 1, this flow corresponds to the check valve 8g, the manifold 7, the check valve 8d, and the eighth connection 23h from the second connection. First, the liquid refrigerant flowing from the connection pipe 23a connected to the first heat exchanger 3 pushes up the valve element 17 of the refrigerant inflow check valve 8g, reaches the lower valve chamber 18, and the refrigerant provided in the lower valve chamber 18 It flows out from the outlet 31. Then, the refrigerant merges with the refrigerant flowing out of the other check valve 8h (not shown in the drawing) in the manifold 7. The joined refrigerant passes through a flow path provided inside the body 24, pushes up the valve element 17 of the check valve 6d, reaches the lower valve chamber 18, passes through the check valve 8d, and passes through the eighth connection portion 23h. leak.

With the above configuration, the long piping required for connecting the conventional check valves 8a, 8b, 8c, 8d, 8g, and 8h can be reduced, and the pressure in the check valve unit 22 can be reduced. Loss can be reduced. Also, check valves 8a, 8b, 8c, 8d,
By integrating and integrating the 8 g, 8 h, the manifold 7, and the connection piping around the manifold to form the check valve unit 22, the entire refrigeration cycle apparatus can be downsized. As described above, the refrigeration cycle device according to the present embodiment can exhibit the function of switching the original flow of the refrigerant, and can sufficiently exhibit the refrigeration capacity and can be downsized because the pressure loss at the check valve portion is small. Things. Further, the number of brazing points is significantly reduced, and defective refrigerant leakage is prevented.

Embodiment 2 FIG. 7 is a side sectional view showing a configuration of a check valve unit 22 according to Embodiment 2 of the present invention. In the present embodiment, the manifold 7 and the refrigerant outlet 29 are located in the upper valve chamber 19 of the check valve, and are provided in a direction perpendicular to the flowing direction of the refrigerant flowing out of the check valve. I have.

Next, the operation and operation of the check valve unit according to the present embodiment will be described. By providing the manifold 7 and the refrigerant outlet 29 in the upper valve chamber 19, the fourth
The refrigerant flowing from the connection portion 23d of the flow path 2 formed between the valve element 17 and the sliding portion 21 of the check valve and the opening hole 29
1, the pressure difference between the pressure in the upper valve chamber 19 and the pressure in the lower valve chamber 18 increases. Thereby, the valve element 1
7 rises until it hits the lids 27a and 27d, and this state can be always maintained. Therefore, the check valve unit 2
5 can be further reduced.

Embodiment 3 FIG. 8 is a sectional side view showing a configuration of a check valve unit 25 according to Embodiment 3 of the present invention. Reference numeral 30 denotes a spacer provided on the lids 27d and 27a. By providing the spacer 30 for regulating the moving distance of the valve element 17 in this way, the valve element 17 is caught by the refrigerant outlet 29 provided in the upper valve chamber 19, and the valve element 17 is closed when the check valve is closed. Can be prevented from falling down.

Embodiment 4 FIG. FIG. 9 is a sectional side view showing a configuration of a check valve unit 22 according to Embodiment 4 of the present invention. 31 is a communication pipe, 32 is a communication hole. In the present embodiment, the communication between the upper valve chamber 18 and the manifold 7 or the refrigerant outlet 29 is provided with a communication pipe 31 and a communication hole connected to the communication pipe 31 inside the body 24 to provide a valve body. Can reliably float, improving the operability of the valve body and reducing the pressure loss of the check valve portion.

Embodiment 5 FIG. FIG. 10 is a sectional side view showing a configuration of a check valve unit 22 according to Embodiment 5 of the present invention. Reference numerals 24a and 24b denote respective bodies obtained by dividing the body into two parts. In the present embodiment, the body has a two-part structure, a manifold is provided in the divided part, and the divided bodies are hermetically bonded and assembled. By doing so, it is possible to reduce complicated machining points on the body and shorten the machining time.

Embodiment 6 FIG. FIG. 11 is a sectional side view showing a configuration of a check valve unit 22 according to Embodiment 6 of the present invention. In the present embodiment, the body has a two-part structure,
In the assembled structure in which a manifold is provided in the divided portion and the divided bodies are air-tightly joined to each other, the communication pipe 31 is eliminated, and the communication holes 32 are built in the bodies 24a and 24b. Thus, the number of connecting portions of the communication pipe can be reduced, and the area occupied by the check valve unit can be reduced.

[0043]

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

Check valves 8a, 8b, 8c, 8 in the outdoor unit
d, 8g, 8h, the manifold 7 and the piping connecting the check valves are provided inside the body, so that complicated refrigerant piping can be eliminated, brazing points can be reduced, and pressure loss can be reduced. Equipment and outdoor units can be made more efficient and smaller. Further, the number of brazing points can be significantly reduced, and refrigerant leakage can be prevented.

According to the second aspect of the present invention, since the refrigerant outlet is provided in the upper valve chamber, the valve body can reliably float and the pressure loss of the check valve can be reduced. Thus, the efficiency of the outdoor unit can be improved.

According to the third aspect of the present invention, since the valve body or the lid is provided with the convex portion such as the spacer for regulating the moving distance of the valve body, the valve body is provided at the refrigerant outlet provided in the upper valve chamber. Since the catching can be prevented, the operation reliability of the check valve unit can be improved.

According to the fourth aspect of the present invention, the communication pipe for communicating the upper valve chamber, the manifold, and the refrigerant outlet is provided and connected, so that the valve body floats reliably and the check valve is closed. State can be reliably switched to the open state.
The pressure loss at the check valve can be reduced.

According to the fifth aspect of the present invention, the check valve unit is divided into two parts, a manifold is provided in each of the divided parts, and the divided bodies are hermetically joined to be assembled. Reduction and machining time can be reduced.

According to the sixth aspect of the present invention, since the communication pipe is provided inside the body, the communication pipe provided outside the body can be eliminated, so that the number of joints can be reduced and the check valve unit can be reduced. Therefore, the outdoor unit can be downsized.

[Brief description of the drawings]

FIG. 1 is a diagram showing a refrigerant circuit of an outdoor unit of a refrigeration cycle device using a check valve unit according to Embodiment 1 of the present invention.

FIG. 2 is a perspective view of a check valve unit in FIG.

FIG. 3 is a top view of the check valve unit in FIG. 1;

FIG. 4 is a sectional side view showing an AA section in FIG. 3;

FIG. 5 is a sectional side view showing a BB section in FIG. 3;

FIG. 6 is a cross-sectional side view showing a CC cross section of FIG. 3;

FIG. 7 is a side sectional view showing a configuration of a check valve unit according to Embodiment 2 of the present invention.

FIG. 8 is a sectional side view showing a configuration of a check valve unit according to Embodiment 3 of the present invention.

FIG. 9 is a sectional side view showing a configuration of a check valve unit according to Embodiment 4 of the present invention.

FIG. 10 is a sectional side view showing a configuration of a check valve unit according to Embodiment 5 of the present invention.

FIG. 11 is a sectional side view showing a configuration of a check valve unit according to Embodiment 6 of the present invention.

FIG. 12 is a block diagram of a conventional refrigerant circuit.

FIG. 13 is a diagram illustrating a flow of a refrigerant in an outdoor unit in a cooling operation.

FIG. 14 is a diagram showing a flow of a refrigerant in an outdoor unit in a heating operation.

FIG. 15 is a diagram showing an operation state of a second stage of the cooling operation.

FIG. 16 is a diagram illustrating an operation state of a third stage of the cooling operation.

FIG. 17 is a diagram illustrating an operation state of a fourth stage of the cooling operation.

FIG. 18 is a diagram showing a flow of a refrigerant in a cooling operation.

FIG. 19 is a diagram showing a flow of a refrigerant in a cooling operation.

FIG. 20 is a diagram showing a flow of a refrigerant in a heating operation.

FIG. 21 is a view showing a cross-sectional structure of a conventional check valve.

FIG. 22 is a top view of the valve element.

FIG. 23 is a sectional side view of a valve body.

FIG. 24 is a view showing a cross-sectional structure of a conventional check valve.

FIG. 25 is a top cross-sectional view of the check valve with the check valve opened.

FIG. 26 is a diagram showing an arrangement state of a number of refrigerant pipes and pipe joints connecting the check valve, the first and second ball valves in the outdoor unit.

[Explanation of symbols]

Compressor, 2 four-way valve, 3 first outdoor heat exchanger,
4 2nd outdoor heat exchanger, 5 accumulator, 6
Solenoid valve, 7 manifold, 8 check valve, 9 first ball valve, 10 second ball valve, 1
1 connection pipe, 12 solenoid valve, 13 distributor, 14
Inlet piping, 15 Outlet piping, 16 body, 17
Valve body, 18 Lower valve chamber, 19 Upper valve chamber, 20
Sealing surface, 21 flow path, 22 check valve unit,
23a-h connection part, 24 body, 25 refrigerant flow path, 26 opening hole, 27a-27e lid, 28a
~ 28c lid with pipe, 29 refrigerant outlet, 30 spacer, 31 communication pipe, 32 communication hole

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomohiko Kasai 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside Mitsubishi Electric Corporation (72) Inventor Katsuhiko Hayashida 2-5-2, Otemachi, Chiyoda-ku, Tokyo F term (reference) in Mitsubishi Electric Engineering Co., Ltd. 3H058 AA05 BB03 BB14 BB22 BB28 BB29 CD29 EE05 EE09 EE13 EE17 3L092 GA08 GA10 HA04

Claims (6)

[Claims] 1. Refrigerant piping parts such as a compressor, an oil separator, an accumulator, a distributor, a manifold, a four-way valve, a solenoid valve, a check valve, a heat exchanger, a ball valve and the like are sequentially connected to a pipe, and an evaporator or a condenser is provided. The heat exchanger that acts as a plurality is divided into a plurality, connected to each heat exchanger so that the refrigerant flows, a plurality of heat exchangers provided for flowing the refrigerant to at least one of the divided heat exchangers Solenoid valve, comprising a plurality of check valves provided to control the flow direction of the refrigerant, in the refrigeration cycle device, wherein the plurality of solenoid valves, and the plurality of check valves are respectively connected by piping, An opening provided for inserting a valve body of the check valve into the body in order to combine the plurality of check valves in the refrigeration cycle and arrange the plurality of check valves in the direction of gravity inside one body. Hole The valve body is inserted into the hole, and a lid for ensuring airtightness, or a lid with piping is fixed by joining to the body, and integrated and integrated so that assembly from one direction is possible. Forming a refrigerant flow path that connects a plurality of check valves provided inside the body,
A refrigeration cycle apparatus having a check valve unit having a structure in which a manifold in which the refrigerant that has passed through the check valve merges is provided inside the body. 2. A refrigerant inlet for the refrigerant flowing into the check valve is provided below the valve body of the check valve, a refrigerant outlet for the refrigerant flowing out is located in the lower valve chamber, and the refrigerant flowing out of the check valve is located in the lower valve chamber. The flow is
The check valve unit according to claim 1, wherein the check valve unit is provided in a direction perpendicular to a flowing direction of the refrigerant. 3. A convex portion such as a spacer for regulating a moving distance of the valve element is provided on the valve element or the lid so that the valve element does not catch on the refrigerant outlet provided in the upper valve chamber. The check valve unit according to claim 2, wherein: 4. The check valve unit according to claim 1, wherein a communication pipe for communicating the upper valve chamber of the check valve unit with the manifold and the refrigerant outlet is provided and connected. . 5. A body in which the plurality of check valves are integrated has a two-part structure, and a manifold is provided in the divided part.
The check valve unit according to any one of claims 2 to 4, wherein the divided bodies are joined together by bolting, brazing, welding, or the like to be airtight. 6. The check valve unit according to claim 4, wherein the communication pipe is provided inside the body.