JP6888665B2 - Shut valve and air conditioner - Google Patents

Description

An air conditioner equipped with a closing valve and a closing valve for shutting off the flow of refrigerant.

In some conventional heat source units, the refrigerant flows inside the unit. By giving heat energy to the refrigerant by the heat source unit or depriving the refrigerant of heat energy by the heat source unit, the heat source unit can supply a warmed refrigerant or a cooled refrigerant to the utilization unit. Such a heat source unit is usually provided with a closing valve as described in, for example, Patent Document 1 (Japanese Unexamined Patent Publication No. 2013-242038). In the closing valve described in Patent Document 1, a valve body for opening and closing the closing valve to control the opening and closing of the flow of the refrigerant is arranged. The closing valve is opened and closed by moving the valve body to open or block the flow path inside the closing valve.

The closing valve described in Patent Document 1 is connected to the refrigerant pipe of the heat source unit, and is also connected to the refrigerant pipe extending to the utilization unit. Further, the closing valve of Patent Document 1 is fixed to a heat source unit such as an outdoor unit. The closing valve is required to have high accuracy and high strength for connection with the refrigerant pipe and fixing to the heat source unit. In order to satisfy such a requirement, copper or a copper alloy is used for the closing valve described in Patent Document 1. It has also been described that a portion of the shutoff valve is made of aluminum, an aluminum alloy or a synthetic resin instead of copper or a copper alloy. However, replacing copper or a copper alloy with aluminum, an aluminum alloy, or a synthetic resin is advantageous for weight reduction, but causes a decrease in strength and is likely to cause deformation due to long-term use. Then, when the closing valve is deformed, the risk of the refrigerant leaking from the closing valve increases.

Reducing the weight of such a closing valve has a problem that the risk of refrigerant leakage increases.

The closing valve of the first aspect allows the refrigerant to flow between the first refrigerant pipe and the second refrigerant pipe in a state of being connected between the first refrigerant pipe extending to the utilization unit and the second refrigerant pipe of the heat source unit. It is a closing valve that has a flow path inside and switches the opening and closing of the flow path. The closing valve includes a valve body, a first component, and a second component. The valve body is configured to be able to move through the moving passage between the first position where the flow path is closed and the second position where the flow path is opened. The first component includes a first connection portion connected to the first refrigerant pipe. The second component includes a valve body accommodating portion for accommodating the valve body located at the second position. The first component and the second component are separate components, the strength of the second material constituting the second component is greater than the strength of the first material constituting the first component, and the first material contains copper. The second material contains iron.

In the closing valve having such a configuration, since the strength of the second material constituting the second component including the valve body accommodating portion is larger than the strength of the first material constituting the first component, the second component is used as the second component. By making the second part from the material, the strength of the second part becomes higher than when the second part is made from the first material, and the second part including the valve body accommodating part through which the moving passage passes is less likely to be deformed. A leak-proof closure valve can be provided.

Further, in the closing valve having such a configuration, iron is contained in the second material constituting the second component including the valve body accommodating portion, while the first component including the first connecting portion connected to the first refrigerant pipe. Since copper is contained in the first material constituting the above, the strength of the second component can be easily increased to be higher than the strength of the first component, and the first connection portion can be easily processed. It is possible to inexpensively provide a closing valve in which the refrigerant does not easily leak from the connection portion.

The closing valve of the second aspect is the closing valve of the first aspect, and the first component and the second component are brazed to each other.

In a closing valve having such a configuration, since the first component and the second component of different components are brazed to each other, the first component and the second component can be firmly connected to each other. It is possible to maintain the dimensional accuracy between the second parts and suppress an increase in the risk of refrigerant leakage.

The closing valve of the third aspect is a closing valve of the first aspect or the second aspect, in which the first connecting portion is connected to the flared first refrigerant pipe.

In a closing valve having such a configuration, if the first connecting portion connected to the flared first refrigerant pipe is made of a first material having a strength lower than that of the second material constituting the second component. For this reason, the range of selection of the first material is widened, and it becomes easier to select a material with good processing accuracy as the first material. Dimensional accuracy can be easily achieved.

The closing valve of the fourth aspect is any of the closing valves of the first to third aspects, and further includes a second connecting portion connected to the second refrigerant pipe and a support portion fixed to the heat source unit. , The strength of the third material constituting the second connecting portion and the supporting portion is configured to be larger than the strength of the first material.

In the closing valve having such a configuration, since the strength of the third material constituting the support portion is larger than the strength of the first material, it is easy to give high strength to the support portion, and the first refrigerant pipe is provided at the first connection portion. The support portion is less likely to be deformed by the stress applied to the support portion each time it is connected, and it is easy to suppress the risk of refrigerant leakage from the second connection portion and the valve body accommodating portion due to the deformation starting from the support portion. Can be done.

The closing valve of the fifth aspect is a closing valve of the fourth aspect, which includes a third component including a support portion, and the third component and the second component are separate components.

In a closing valve having such a configuration, since the third component including the support portion is a separate component from the second component, for example, even if the support portion has a complicated shape, the influence of the shape of the support portion is the first factor. It can be processed without giving to two parts, and it becomes easy to obtain a valve body accommodating portion with high dimensional accuracy.

The closing valve of the sixth aspect is any closing valve of the first to fifth aspects, wherein the second component includes a service port for filling the heat source unit with the refrigerant.

In a closed valve having such a configuration, since the service port is included in the second component, the service port can also be composed of the second material. Therefore, the strength of the service port is increased and the risk of refrigerant leakage from the service port is reduced. Can be done.

The closing valve of the seventh aspect is any of the closing valves of the first to sixth aspects, and the moving passage and the valve body are threaded for moving the valve body.

The air conditioner of the eighth aspect includes a utilization unit, a first refrigerant pipe, a heat source unit, and a closed valve door. The first refrigerant pipe extends to the utilization unit. The heat source unit has a second refrigerant pipe. The closing valve is any closing valve from the first viewpoint to the seventh viewpoint, and is connected between the first refrigerant pipe and the second refrigerant pipe, and is connected to the first refrigerant pipe and the second refrigerant pipe. It has a flow path inside that allows the refrigerant to flow between them, and switches the opening and closing of the flow path.

The air conditioner of the ninth aspect is the air conditioner of the eighth aspect, further including a flare nut for fastening the first refrigerant pipe and the first connection portion of the first component of the closing valve.

The circuit diagram which shows an example of the air conditioner which uses the shutoff valve which concerns on embodiment. The perspective view which shows an example of the appearance of the air conditioner of FIG. An exploded perspective view showing a heat source unit of an air conditioner. Perspective view of the closing valve mounting plate which is a part of the casing of the heat source unit. Sectional view of the shutoff valve. The perspective view which shows the appearance of a valve body. Sectional drawing of the valve body for demonstrating the position of the valve body when a closing valve is closed. Sectional drawing of the valve body for demonstrating the position of the valve body when a closing valve is opened. Sectional view of the shutoff valve. The flowchart which shows an example of the manufacturing flow of a shutoff valve. FIG. 3 is a cross-sectional view of the closing valve according to the modified example 1A. FIG. 3 is a cross-sectional view of the closing valve according to the modified example 1B. FIG. 3 is a cross-sectional view of the closing valve according to the modified example 1C. FIG. 3 is a cross-sectional view of the closing valve according to the modified example 1E. FIG. 3 is a cross-sectional view of a closing valve according to a modified example 1F.

(1) Overall Configuration The closing valves 50 and 70 shown in FIG. 1 are installed in the heat source unit 20 of the air conditioner 10. As shown in FIG. 1, the air conditioner 10 includes a refrigerant circuit 11 in which a utilization unit 30 and a heat source unit 20 are connected by refrigerant pipes 12 and 13. The refrigerant circuit 11 includes the compressor 21, the four-way valve 22, the heat source side heat exchanger 23, the expansion valve 24, the accumulator 25, the closing valves 50, 70, and the utilization unit 30 provided in the heat source unit 20. The side heat exchanger 31 is connected. The air conditioner 10 has a configuration in which a cooling operation and a heating operation can be selectively performed by a vapor compression refrigeration cycle carried out in the refrigerant circuit 11. The four-way valve 22 is in the connection state shown by the solid line in the cooling operation mode, and is in the connection state shown by the broken line in the heating operation mode. A refrigerant pipe 26 extending toward the inside of the heat source unit 20 is connected to the shutoff valve 50. The refrigerant pipe 26 shown in FIG. 1 extends to the four-way valve 22. Further, a refrigerant pipe 27 extending toward the inside of the heat source unit 20 is connected to the closing valve 70. The refrigerant pipe 27 shown in FIG. 1 extends to the expansion valve 24.

FIG. 2 shows an example of the appearance of the air conditioner 10. In the air conditioner 10 shown in FIG. 2, for example, the utilization unit 30 is attached to a wall surface or the like in the room, and the heat source unit 20 is installed outside the room. It is the piping member 14 that connects the heat source unit 20 and the utilization unit 30. Refrigerant pipes 12 and 13 pass through the pipe member 14. In addition to the refrigerant pipes 12 and 13, for example, electric wires and signal lines (not shown) connected to the heat source unit 20 and the utilization unit 30 pass through the pipe member 14. The piping member 14 also includes a heat insulating member that covers the outside of the refrigerant pipes 12, 13 and the like, and a piping decorative cover.

When the cooling operation and the heating operation are performed, the closing valves 50 and 70 are in the open state. Before the air conditioner 10 is installed in a building such as a house, the refrigerant is confined and transported in, for example, the heat source unit 20. When the refrigerant is maintained in the heat source unit 20 in this way, the closing valves 50 and 70 are closed. Then, after the utilization unit 30 and the heat source unit 20 are installed in the building, the refrigerant pipes 12 and 13 are connected to the heat source unit 20, and the refrigerant pipes 12 and 13 are also connected to the utilization unit 30. After the refrigerant circuit 11 is formed in this way, the closing valves 50 and 70 are opened. In addition, the closing valves 50 and 70 may be opened and closed during maintenance of the air conditioner 10.

(1-1) Circulation of Refrigerant in Cooling Operation Mode When operating in the cooling operation mode, the gas refrigerant compressed by the compressor 21 is sent to the heat source side heat exchanger 23 through the four-way valve 22. The refrigerant dissipates heat to the air in the heat source side heat exchanger 23, expands in the expansion valve 24 to reduce the pressure, and is sent to the utilization side heat exchanger 31 through the closing valve 70 and the refrigerant pipe 13. The low-temperature and low-pressure refrigerant sent from the expansion valve 24 exchanges heat with the user-side heat exchanger 31 to remove heat from the air. The gas refrigerant or the gas-liquid two-phase state refrigerant that has completed heat exchange in the user-side heat exchanger 31 is sucked into the compressor 21 through the refrigerant pipe 12, the closing valve 50, the four-way valve 22, and the accumulator 25. The room is cooled by blowing out the conditioned air from which the heat has been taken by the user side heat exchanger 31 from the user unit 30, for example, into the room.

(1-2) Circulation of Refrigerant in Heating Operation Mode When operating in the heating operation mode, the gas refrigerant compressed by the compressor 21 passes through the four-way valve 22, the closing valve 50, and the refrigerant pipe 12, and heats the user side. It is sent to the exchanger 31. The refrigerant exchanges heat with air in the user-side heat exchanger 31 to give heat to the air. The refrigerant that has completed heat exchange in the user-side heat exchanger 31 is sent to the expansion valve 24 through the refrigerant pipe 13 and the closing valve 70. The low-temperature low-pressure refrigerant that has been expanded and decompressed by the expansion valve 24 is sent to the heat source side heat exchanger 23, and heat exchange is performed by the heat source side heat exchanger 23 to obtain heat from the air. The gas refrigerant or the gas-liquid two-phase state refrigerant that has completed heat exchange in the heat source side heat exchanger 23 is sucked into the compressor 21 through the four-way valve 22 and the accumulator 25. The room is heated by blowing out the conditioned air heated by the user side heat exchanger 31 from the user unit 30, for example, into the room.

(1-3) Air flow The heat source unit 20 includes a heat source side fan 28, and the utilization unit 30 includes a utilization side fan 32. The heat source side fan 28 supplies air to the heat source side heat exchanger 23 in order to promote heat exchange between the air and the refrigerant in the heat source side heat exchanger 23 in the cooling operation mode and the heating operation mode. Further, the user side fan 32 supplies air to the user side heat exchanger 31 in order to promote heat exchange between the air and the refrigerant in the user side heat exchanger 31 in the cooling operation mode and the heating operation mode.

(2) Detailed configuration (2-1) Heat source unit 20
FIG. 3 shows a state in which some parts of the heat source unit 20 have been removed and the heat source unit 20 has been disassembled. The parts removed in FIG. 3 are the right side plate 43 and the closing valve cover 90. The right side plate 43 is a part of the casing 40.

(2-1-1) Casing 40
The casing 40 is a hollow box body and has six surfaces like a rectangular parallelepiped. Each member constituting the casing 40 is arranged on any one of the top surface, the front surface, the right side surface, the left side surface, the rear surface, and the bottom surface. A top plate 41 is arranged on the top surface of the casing 40, a front plate 42 is arranged on the front surface, a right side plate 43 is arranged from the right side surface to a part of the rear surface, and a left side plate (shown). A wire mesh or a suction grill (not shown) is arranged on a portion other than the right side plate 43 on the rear surface, and a bottom plate 45 is arranged on the bottom surface. The top plate 41, the front plate 42, the right side plate 43, the left side plate, and the bottom plate 45 are preferably made of a metal member in order to enhance safety, and are formed of, for example, sheet metal. The compressor 21, the four-way valve 22, the heat source side heat exchanger 23, the expansion valve 24, and the heat source side fan 28, which have already been described, are housed in the casing 40.

The front plate 42 is formed with an opening (not shown) through which air is blown out. This opening is, for example, circular, and a blowout grill 42a is arranged in front of the opening. The air that enters from the rear surface of the casing 40 and passes through the heat source side heat exchanger 23 is blown out toward the front of the heat source unit 20 through the blowout grill 42a.

A closing valve mounting plate 46 to which the closing valves 50 and 70 are fixed is attached to the bottom plate 45, for example, with screws. The closing valve mounting plate 46 is preferably made of a metal member in order to enhance safety, and is made of, for example, sheet metal. The closing valve mounting plate 46 is arranged on the right side surface. More specifically, the closing valve mounting plate 46 is mounted so that the closing valves 50 and 70 are located at the opening 43a of the right side plate 43. In other words, the right side plate 43 and the closing valve mounting plate 46 form the right side surface of the casing 40. The closing valve mounting plate 46 constitutes a part of the casing 40. Another opening 43b is formed on the opening 43a of the right side plate 43. An opening 43b is formed in a place where the terminal board 49 arranged inside the casing 40 can be seen.

(2-1-2) Closed valve cover 90
The closing valve cover 90 is a cover that covers the closing valves 50 and 70. The closing valve cover 90 is attached to the right side plate 43. The closing valve cover 90 is configured to cover the openings 43a and 43b while being attached to the right side plate 43. Since the closing valves 50 and 70 protrude from the opening 43a of the casing 40, the outwardly bulging portion 90a of the closing valve cover 90 prevents the closing valves 50 and 70 from coming into contact with the closing valves 50 and 70. It is located in the vicinity. An opening (not shown) for pulling out the refrigerant pipes 12 and 13 connected to the closing valves 50 and 70 is provided between the closing valve cover 90 and the right side plate 43. Insulation cylinders 12a and 13a are attached to the outer circumferences of the refrigerant pipes 12 and 13 shown in FIG. 3, respectively.

(2-1-3) Closing valve mounting plate 46
FIG. 4 shows the appearance of the closing valve mounting plate 46 when the closing valve mounting plate 46 is viewed from diagonally above the front right. The closing valve mounting plate 46 has a flat portion 46a, a bulging portion 46b, a recess 46c, and a rib 46d. The flat portion 46a is a flat plate-shaped portion along the vertical surface of the right side plate 43 in a state where the closing valve mounting plate 46 is attached to the casing 40. By overlapping at least a part of the flat portion 46a with the right side plate 43, the opening 43a of the right side plate 43 can be closed by the closing valve mounting plate 46 without causing an unnecessary gap.

The bulging portion 46b is a portion that bulges toward the outside of the casing 40 with respect to the flat portion 46a. The top portion 46ba of the bulging portion 46b is flat. Two mounting openings 46e and 46f to which the closing valves 50 and 70 are mounted are formed on the flat top portion 46ba. The recess 46c is a portion recessed toward the inside of the casing 40 from the flat portion 46a. By forming the recess 46c in this way and forming irregularities on the closing valve mounting plate 46, the bending strength of the closing valve mounting plate 46 is improved. Further, the rib 46d is formed by bending the end portion of the flat portion 46a toward the inside of the casing 40. By forming such a rib 46d, the bending strength of the closing valve mounting plate 46 is improved. Further, below the closing valve mounting plate 46, there is a screw hole 46g. A screw (not shown) inserted into the screw hole 46g is also inserted into a screw hole (not shown) of the bottom plate 45, and the closing valve mounting plate 46 is fastened to the bottom plate 45 with a screw.

The closing valve mounting plate 46 is preferably made of metal in order to improve safety. The closing valve mounting plate 46 is made of, for example, a sheet metal member. When the sheet metal member is pressed, for example, the closing valve mounting plate 46 having a complicated shape as described above is formed. The surroundings of the mounting openings 46e and 46f of the closing valve mounting plate 46 are surrounded by ribs 46h and 46i rising from the flat portion 46a. These ribs 46h and 46i can also be formed together, for example, when the shape of the closing valve mounting plate 46 is formed from a sheet metal member by press working. Refrigerant pipes 26 and 27 are brazed and fixed inside the ribs 46h and 46i, for example. Therefore, the brazing material is clad inside the ribs 46h and 46i. Then, the valve bodies 55 and 75, which will be described later, are fixed to the flat tops 46ba around the ribs 46h and 46i by, for example, brazing.

(2-2) Detailed configuration of closed valve (2-2-1) Closed valve 50
FIG. 5 shows the cross-sectional shape of the closing valve 50. FIG. 6 shows the appearance of the closing valve 50. 7 and 8 are drawings for explaining the movement of the valve body 51 in the closing valve 50. Since FIGS. 7 and 8 illustrate the movement of the valve body 51, FIGS. 7 and 8 show a simplified structure of the closing valve 50 as compared with FIG. The + direction (Z (+)) of the Z axis of the coordinate axes shown in FIGS. 5 to 8 is the direction from the inside to the outside of the heat source unit 20, and conversely, the-direction (Z (-)) is the heat source unit. The direction is from the outside to the inside of 20. Since the shutoff valve 50 is attached to the right side surface of the heat source unit 20, the Z axis becomes an axis perpendicular to the right side surface. The + direction of the X-axis is the direction from the closing valve 50 toward the refrigerant pipe 12, and here, the direction is from the front to the back of the heat source unit 20. Further, the + direction of the Y-axis is the direction from the bottom to the top of the heat source unit 20.

The closing valve 50 has a flow path 52 inside which the refrigerant flows between the refrigerant pipe 12 and the refrigerant pipe 26 in a state of being connected between the refrigerant pipe 12 extending to the utilization unit 30 and the refrigerant pipe 26 of the heat source unit 20. Have in. The closing valve 50 switches the opening and closing of the flow path 52 by moving the valve body 51.

The valve body 51 can move between the first position P1 (see FIG. 7) that closes the flow path 52 and the second position P2 (see FIG. 8) that opens the flow path 52 through the moving passage 53. It is configured as follows. The moving passage 53 is threaded, and a male thread 51a (see FIG. 8) is threaded on a part of the valve body 51. Then, when the valve body 51 is rotated clockwise CW, it advances in the direction from the second position P2 to the first position P1 (direction of arrow Ar1), and conversely, when the valve body 51 is rotated counterclockwise CCW, Proceed in the direction from the first position P1 to the second position P2 (direction of arrow Ar2).

The flow path 52 is formed inside the valve body 55. The valve body 55 includes a first component 56, a second component 57, and a service port component 58. The first component 56, the second component 57, and the service port component 58 are separate components from each other. Then, the joint surface BS1 of the first component 56 and the second component 57 is brazed, and the first component 56 and the second component 57 are integrated. Further, the joint surface BS2 of the second component 57 and the service port component 58 is brazed, and the second component 57 and the service port component 58 are integrated. The outer circumference of the first component 56 at a portion that is fitted into the second component 57 and is in contact with the second component 57 is hexagonal. Similarly, the outer circumference of the service port component 58 at the portion that is fitted into the second component 57 and is in contact with the second component 57 is hexagonal.

The first component 56 includes a first connection portion 56a connected to a refrigerant pipe 12 extending to the utilization unit 30. The tip portion 12b of the refrigerant pipe 12 is flared. Therefore, the inner diameter of the tip portion 12b of the refrigerant pipe 12 becomes larger as it is closer to the tip. A taper 56aa is provided at the tip of the first connection portion 56a of the first component 56 so as to match the shape of the tip portion 12b of the refrigerant pipe 12. The refrigerant pipe 12 is fastened to the first connection portion 56a by the flare nut 60. Therefore, a male screw 56ab to be coupled to the flare nut 60 is provided in a part of the first connecting portion 56a.

There is a risk of refrigerant leakage due to a gap between the refrigerant pipe 12 and the first connection portion 56a of the first component 56 at the connection portion between the refrigerant pipe 12 and the first connection portion 56a. doing. Therefore, in order to prevent the refrigerant from leaking at the connection point between the refrigerant pipe 12 and the first connection portion 56a of the first component 56, it is preferable that the first connection portion 56a is processed with high dimensional accuracy. In order to facilitate processing of the first connecting portion 56a with high dimensional accuracy, the first component 56 is made of a metal containing copper (Cu). As a metal containing copper which is a material of the first component 56, for example, there is brass. Examples of brass as the material of the first component 56 include C3604 (free-cutting brass) and C3771 (brass for forging) specified in JIS H3250.

The first component 56 can be easily formed by, for example, cutting a hexagonal columnar brass member. In the cutting process of the brass member, for example, a through hole is drilled in the center of the hexagonal columnar brass member to form the flow path 52. The cross-sectional shape of the flow path 52 is circular. Further, the joint surface BS1 is formed by cutting the joint surface BS1 with a lathe or the like at the end portion on the opposite side of the end portion where the taper 56aa (see FIG. 6) is formed. After that, if the surface shape of the first part 56 is formed by cutting the male screw 56ab, the taper 56aa, etc. from the surface of the brass member with a lathe, the first brass part 56 can be obtained. .. The reason why the hexagonal portion is left in the first part 56 is that the hexagonal portion is used as a detent when attaching the refrigerant pipe 12 to the first component 56 with the flare nut 60.

The second component 57 includes a valve body accommodating portion 57a that accommodates the valve body 51 located at the second position P2. The valve body accommodating portion 57a is a portion from the boundary portion between the moving passage 53 and the outer portion 52a of the flow path 52 to one end portion 53a of the moving passage 53 in the first component 56. The outer portion 52a of the flow path 52 is an inner peripheral wall of the flow path 52 located far from the heat source unit 20 in the X-axis direction. The direction away from the heat source unit 20 is the + direction of the Z axis.

As shown in FIG. 8, the valve body 51 moves to the second position P2, and almost all of the valve body 51 is housed in the valve body accommodating portion 57a, so that the flow path 52 is opened. The refrigerant can flow between the refrigerant pipe 12 and the refrigerant pipe 26. When the valve body 51 is moving to the second position P2, the O-ring 51e of the valve body 51 seals between the inner peripheral surface of the moving passage 53 and the valve body 51. By being sealed by the O-ring 51e fitted to the outer periphery of the valve body 51, the gap between the inner peripheral surface of the moving passage 53 and the valve body 51 passes through the opening of one end 53a of the moving passage 53. Refrigerant leakage is prevented.

In a situation where the valve body 51 is not moved, a valve lid 65 is attached to the second component 57 to block the moving passage 53. A male screw 57c to be combined with a female screw 65a cut inside the valve lid 65 is cut on a part of the outer peripheral surface of the second component 57. The valve lid 65 is screwed into the second component 57 to protect the valve body 51.

A female screw 53c (see FIG. 8) is cut in the moving passage 53 in the valve body accommodating portion 57a at a portion close to the outer portion 52a of the flow path 52. The male screw 51a cut in the valve body 51 corresponds to the female screw 53c in the valve body accommodating portion 57a. A hole 51b having a hexagonal cross section is provided in the upper part of the valve body 51. By inserting, for example, a hexagon wrench into the hole 51b and rotating the valve body 51, the valve body 51 can be moved in the moving passage 53. When the valve body 51 is rotated clockwise CW from the state where the flow path 52 in FIG. 8 is open, the valve body 51 is moved toward the heat source unit 20 (toward the closing valve mounting plate 46) through the moving passage 53. , The flow path 52 shown in FIG. 7 can be in a closed state. When the flow path 52 is closed, the tapered portion 51d at the tip of the valve body 51 comes into contact with the flow path 52 at the other end 53b of the moving passage 53 without a gap. The inner diameter of the flow path 52 is reduced at the other end 53b of the moving passage 53 so that the tapered portion 51d can contact the flow path 52 without a gap at the other end 53b of the moving passage 53. The place where the inner diameter of the flow path 52 is small is the valve seat 59 on which the valve body 51 is seated. The valve seat 59 has a ring shape, and the center of the ring substantially coincides with the central axis of the moving passage 53. Here, "substantially matching" means that they match within the range of manufacturing error. In order for the tapered portion 51d to come into contact with the flow path 52 at the other end 53b of the moving passage 53 without a gap, the central axis of the moving passage 53 having a circular cross section coincides with the central axis of the flow path 52 having a circular cross section. Is preferable. If the central axis of the moving passage 53 and the central axis of the flow path 52 along the Z axis deviate from each other, a portion where the tapered portion 51d does not contact the valve seat 59 is formed, and the refrigerant is sufficiently shut off.

The second component 57 includes a support portion 57b. The support portion 57b is a portion fixed to the heat source unit 20. Here, since the closing valve mounting plate 46 forms a part of the casing 40 of the heat source unit 20, the portion fixed to the closing valve mounting plate 46 is the support portion 57b. Further, the second component 57 includes a fitting portion 57d. The rib 46h of the closing valve mounting plate 46 is fitted into the fitting portion 57d. The support portion 57b is composed of a rib or a tapered portion.

The support portion 57b is brazed to the closing valve mounting plate 46. The brazing of the support portion 57b and the closing valve mounting plate 46 is performed by brazing the joint surface BS1 of the first part 56 and the second part 57 and the joint surface BS2 of the service port part 58 and the second part 57. It is preferable to carry out the process together in the furnace at a time from the viewpoint of reducing the number of manufacturing processes. Since the O-ring 51e is attached to the valve body 51, it is used for brazing the support portion 57b and the closing valve mounting plate 46, brazing the joint surface BS1 of the first component 56 and the second component 57, and for the service port. After the brazing of the joint surface BS2 of the component 58 and the second component 57 is completed, the valve body 51 is attached to the valve body 55. However, the brazing of the support portion 57b and the closing valve mounting plate 46, the brazing of the joint surface BS1 of the first part 56 and the second part 57, and the brazing of the joint surface BS2 of the service port part 58 and the second part 57. Brazing may be done separately.

Since the second component 57 has a support portion 57b, a joint surface BS1 with the first component 56, and a joint surface BS2 with the service port component 58, when the valve body 51 is moved, the refrigerant is applied to the first component 56. It is necessary to have sufficient strength to withstand the stress generated when the pipe 12 is connected and when a hose (not shown) is connected to the service port component 58. Similar to the first part 56, when trying to manufacture the second part 57 using a metal containing copper (Cu), for example, brass, the strength cannot be obtained unless the wall thickness of the second part 57 is increased. Therefore, when the second part 57 is manufactured using brass, the second part 57 tends to be heavy, and the price tends to be high because a large amount of material is used. Therefore, the second component 57 is made of a metal containing iron (Fe), which is easier to obtain higher strength than the metal containing copper. Examples of metals containing iron include stainless steel. Since the heat source unit 20 is often installed outdoors, it is preferable to use stainless steel that does not easily rust. Therefore, the strength of the second material constituting the second component 57 is higher than the strength of the first material constituting the first component 56. The strength of these materials is compared by a tensile test (because of the cylindrical shape, No. 11 test piece) conforming to JIS standard Z2241 (2011).

The second component 57 can be easily formed by processing, for example, a cylindrical stainless steel member. For example, by forging, the end portion of the cylindrical stainless steel member is widened to form the support portion 57b. After that, for example, by bulge processing, a convex portion for forming the joint surfaces BS1 and BS2 is formed in the central portion of the cylindrical stainless steel member. Further, for example, the joint surfaces BS1 and BS2 are formed on the convex portion of the cylindrical stainless steel member by cutting. Further, in order to improve the dimensional accuracy of the support portion 57b, for example, the support portion 57b may be cut after the forging process. Then, the second component 57 can be obtained by cutting a male screw 57c and a female screw 53c on the outer peripheral surface of the cylindrical stainless steel member.

The service port component 58 is a component for providing a service port for filling the heat source unit 20 with the refrigerant. In the service port component 58, there is a suction path 58a extending along the X axis (extending in the front-rear direction of the heat source unit 20). The suction passage 58a is connected to the flow path 52. A valve core 69 is installed in the suction passage 58a of the service port component 58 so as to close the suction passage 58a. The valve core 69 has a built-in opening / closing pin 69a. When the pin 69a is pushed in the + direction of the X-axis, the pin 69a moves toward the flow path 52, and a flow path is opened in the valve core 69. For example, when the hose of a vacuum pump (not shown) is connected to the service port component 58, the pin 69a is pushed by the hose to form a flow path from the suction path 58a to the vacuum pump. By driving the vacuum pump in the state where the vacuum pump is connected in this way, the air in the refrigerant pipes 12 and 13 and the heat exchanger 31 on the user side can be evacuated.

In the normal use state of the heat source unit 20 in which the service port is not used, a cap 68 is attached to the service port component 58 to block the suction path 58a. A male screw 58b to be combined with a female screw 68b cut inside the cap 68 is cut on a part of the outer peripheral surface of the service port part 58. The cap 68 is sealed by metal-touching the service port component 58 at the location indicated by reference numeral 68a. The cap 68 is in contact with the taper 58c of the service port component 58 without a gap.

When sufficiently removing air from the refrigerant pipe 12 or the like or filling it with refrigerant, there is a possibility that air may enter and the degree of vacuum may not be improved due to a gap between the service port component 58 and the hose from the outside. Also, the refrigerant may leak from the gap. Therefore, in order to prevent air intrusion and refrigerant leakage at the connection point between the hose and the service port component 58, it is preferable that the service port component 58 is processed with high dimensional accuracy. In order to facilitate processing of the service port component 58 with high dimensional accuracy, the service port component 58 is made of a metal containing copper (Cu). As a metal containing copper which is a material of the service port component 58, for example, there is brass. As the brass material of the service port component 58, for example, there is C3604 or C3771 specified in JIS H3250.

The service port component 58 can be easily formed, for example, by cutting a hexagonal columnar brass member. In the cutting process of the brass member, for example, a through hole is drilled in the center of the hexagonal columnar brass member to form a suction path 58a. Therefore, the cross-sectional shape of the suction passage 58a is circular. Further, the joint surface BS2 is formed by cutting the joint surface BS2 with a lathe or the like at the end portion on the opposite side of the end portion where the taper 58c is formed. After that, if the surface shape of the service port part 58 is formed by cutting the male screw 58b, the taper 58c, etc. from the surface of the brass member with a lathe, the brass service port part 58 can be obtained. Can be done.

(2-2-2) Closing valve 70
As shown in FIG. 9, the closing valve 70 also has a valve body 75 composed of a plurality of brazed parts, similarly to the closing valve 50. Unlike the closing valve 50, the closing valve 70 does not have a service port and does not have a component corresponding to the service port component 58. However, the closing valve 70 has a configuration corresponding to the closing valve 50, except for the parts corresponding to the service port component 58. Therefore, here, a part of the description of the closing valve 70 will be omitted by explaining the correspondence between the components of the closing valve 70 and the components of the closing valve 50.

The closing valve 70 includes a valve body 51, an O-ring 51e, a flow path 52, a moving passage 53, a valve body 55, a first component 56, a first connecting portion 56a, a second component 57, and a valve body accommodating portion 57a of the closing valve 50. , Support portion 57b, fitting portion 57d, and valve body 71 corresponding to valve lid 65, O-ring 71e, flow path 72, moving passage 73, valve body 75, first component 76, first connection portion 76a, second. It has a component 77, a valve body accommodating portion 77a, a support portion 77b, a fitting portion 77d, and a valve lid 85.

The closing valve 70 has a flow path 72 inside which the refrigerant flows between the refrigerant pipe 13 and the refrigerant pipe 27 in a state of being connected between the refrigerant pipe 13 extending to the utilization unit 30 and the refrigerant pipe 27 of the heat source unit 20. Have in. The closing valve 70 also switches the opening and closing of the flow path 72 by moving the valve body 71. Therefore, the valve body 71 is configured to be able to move through the moving passage 73 between the first position P1 that closes the flow path 72 and the second position P2 that opens the flow path 72. A part of the moving passage 73 and the valve body 71 is threaded, and when the valve body 71 is rotated clockwise, the valve body 71 advances in the direction from the second position P2 to the first position P1 and conversely reverses the valve body 71. When it is rotated clockwise, it advances in the direction from the first position P1 to the second position P2.

The flow path 72 is formed inside the valve body 75. The valve body 75 includes a first component 76 and a second component 77. The first part 76 and the second part 77 are separate parts from each other. Then, the joint surface BS1 of the first component 76 and the second component 77 is brazed, and the first component 76 and the second component 77 are integrated.

The first component 76 includes a first connection portion 76a connected to a refrigerant pipe 13 extending to the utilization unit 30. The tip portion 13b of the refrigerant pipe 13 is flared. A taper 76aa is provided at the tip of the first connection portion 76a of the first component 76 so as to match the shape of the tip portion 13b of the refrigerant pipe 13. The refrigerant pipe 13 is fastened to the first connection portion 76a by the flare nut 80.

Similar to the closing valve 50, in the closing valve 70 as well, in order to facilitate processing of the first connecting portion 76a with high dimensional accuracy, the first component 76 is made of a metal containing copper (Cu). Examples of the metal containing copper, which is the material of the first component 56, include brass, and more specifically, for example, C3604 or C3771 specified in JIS H3250. Similar to the first component 56, the first component 76 can be easily formed by, for example, cutting a hexagonal columnar brass member.

The second component 77 includes a valve body accommodating portion 77a for accommodating the valve body 71 located at the second position P2. The valve body accommodating portion 77a is a portion from the boundary portion between the moving passage 73 and the outer portion 72a of the flow path 72 to one end portion 73a of the moving passage 73 in the first component 76. When the valve body 71 is moving to the second position P2, the O-ring 71e of the valve body 71 seals between the inner peripheral surface of the moving passage 73 and the valve body 71. In a situation where the valve body 71 is not moved, a valve lid 85 is attached to the second component 77 to block the moving passage 73. A hole 71b having a hexagonal cross section is provided in the upper part of the valve body 71. By inserting, for example, a hexagon wrench into the hole 71b and rotating the valve body 71, the valve body 71 can be moved in the moving passage 73.

When the flow path 72 is closed, the tapered portion 71d at the tip of the valve body 71 comes into contact with the flow path 72 at the other end 73b of the moving passage 73 without a gap. The inner diameter of the flow path 72 extending along the Z axis is reduced at the other end 73b of the moving passage 73 so that the tapered portion 71d can contact the flow path 72 without a gap at the other end 73b of the moving passage 73. .. The place where the inner diameter of the flow path 72 is small is the valve seat 79 on which the valve body 71 is seated. In order for the tapered portion 71d to come into contact with the flow path 72 at the other end 73b of the moving passage 73 without a gap, the central axis of the moving passage 73 having a circular cross section coincides with the central axis of the flow path 72 having a circular cross section. Is preferable. If the central axis of the moving passage 73 and the central axis of the flow path 72 deviate from each other, a portion where the tapered portion 71d does not contact the valve seat 79 is formed, and the refrigerant is sufficiently shut off.

The second component 77 includes a support portion 77b. The support portion 77b is a portion fixed to the heat source unit 20. Further, the second component 77 includes a fitting portion 77d. The rib 46i of the closing valve mounting plate 46 is fitted into the fitting portion 77d. The support portion 77b is brazed to the closing valve mounting plate 46. Brazing the support portion 77b and the closing valve mounting plate 46 together with the brazing of the joint surface BS1 of the first component 76 and the second component 77 is performed in the furnace at the same time from the viewpoint of reducing the manufacturing process. preferable.

Since the second component 77 has the joint surface BS1 with the support portion 77b and the first component 76, the stress generated when the valve body 71 is moved, the refrigerant pipe 13 is connected to the first component 76, and the like. It needs to be strong enough to withstand. Therefore, the second component 77 is made of a metal containing iron (Fe), which is easier to obtain higher strength than the metal containing copper. Examples of metals containing iron include stainless steel. Since the heat source unit 20 is often installed outdoors, it is preferable to use stainless steel that does not easily rust.

The second component 77 can be easily formed by processing, for example, a cylindrical stainless steel member. For example, by forging, the end portion of the cylindrical stainless steel member is expanded to form the support portion 77b. After that, for example, by bulge processing, a convex portion for forming the joint surface BS1 is formed in the central portion of the cylindrical stainless steel member. Further, for example, the joint surface BS1 is formed on the convex portion of the cylindrical stainless steel member by cutting. Further, in order to improve the dimensional accuracy of the support portion 77b, for example, the support portion 77b may be cut after the forging process.

(2-2-3) Manufacturing Process of Closing Valves 50 and 70 Although already described, an example of the flow of the manufacturing process of the closing valves 50 and 70 will be described with reference to FIG. Cutting of the first parts 56 and 76 which are brass parts and the part 58 for the service port (step S1), processing of the second parts 57 and 77 which are stainless steel parts (step S2), and mounting of the closing valve which is a sheet metal part. The press working of the plate 46 (step S3) may be carried out in parallel with each other, or may be carried out sequentially.

The first parts 56 and 76 and the service port parts 58 are machined from, for example, a hexagonal columnar brass rod by cutting. The second parts 57 and 77 are obtained, for example, by processing a cylindrical stainless steel pipe. Forging, pressing, bulging and cutting can be used for processing stainless steel pipes, for example. The closing valve mounting plate 46 is obtained, for example, by pressing one sheet metal.

The first parts 56 and 76, the service port parts 58, the second parts 57 and 77, the closing valve mounting plate 46, and the refrigerant pipes 26 and 27 are assembled and brazed in the furnace (step S4). For example, a brazing material is clad at the brazed portion of the assembled part before assembling. At the time when brazing in the furnace is started, the joint surface BS1 of the first parts 56,76 and the second parts 57,77, the joint surface BS2 of the first part 56 and the service port part 58, the support portion 57b and the closing valve A clad brazing material is present on the boundary surface of the mounting plate 46 and the boundary surface between the ribs 46h and 46i and the refrigerant pipes 26 and 27.

For example, the valve bodies 51, 71, the valve lids 65, 85, the cap 68, the valve core 69, and the like are prepared by the same method as before (step S5). The valve bodies 51 and 71 are incorporated into the assembly brazed in step S4 and the valve bodies 55 and 75 and the refrigerant pipes 26 and 27 are fixed to the closing valve mounting plate 46, and the second parts 57 and 77 are assembled. The ends are crimped and molded so that the valve bodies 51 and 71 cannot be pulled out. After that, the valve core 69 was inserted into the assembly, the valve lids 65, 85 and the cap 68 were screwed into the assembly, and the closing valve mounting plate 46, the closing valves 50, 70, and the refrigerant pipes 26, 27 were integrated. The assembly can be obtained (step S6).

(3) Modification example (3-1) Modification example 1A
In the above embodiment, the support portion 57b was included in the second component 57, but as shown in FIG. 11, the second component 57 of the above embodiment is referred to as the second component 157 and the second component 157. May be configured by combining another third component 159. The third component 159 includes a support portion 57b. In the second component 57 and the second component 157, the closing valve 50 shown in FIG. 11 has the same reference numerals as those in the above embodiment, only the difference is whether the support portion 57b is integrated or separated. The other part is the same component as the closing valve 50 of the above embodiment.

The inner diameter of the third component 159 in FIG. 11 substantially matches the outer diameter of the second component 157. By fitting the third component 159 into the second component 157 and joining the third component 159, a component having the same function as the second component 57 of the above embodiment can be obtained. By forming the support portion 57b as the third component 159, the configuration of the second component 157 becomes simple, and the molding of the second component 157 becomes easy. The second component 157 and the third component 159 may be joined by brazing, for example.

Also in the closing valve 70, the support portion 77b can be formed as a third component separate from the second component.

(3-2) Modification 1B
In the above modification 1A, the case where the second component 157 and the service port component 58 are separate components has been described, but as in the second component 257 shown in FIG. 12, the second component 257 is serviced. It may be configured to include a port. The second component 257 may be formed by using, for example, an L-angle stainless steel pipe. FIG. 12 shows a configuration in which the support portion 57b is not included in the second component 257, but the second component is configured to include the valve body accommodating portion 57a, the support portion 57b, and the service port. May be good. In the closing valve 50 shown in FIG. 12, other parts having the same reference numerals as those of the modification 1A are the same components as the closing valve 50 of the above embodiment.

(3-3) Modification 1C
In the above embodiment, the first component 56 and the service port component 58 are configured as separate components, but as in the first component 356 shown in FIG. 13, the first component 56 of the above embodiment And the service port component 58 may be integrated and arranged so that the first component 356 penetrates the second component 357. In this case, after brazing the first component 356 and the second component 357, the moving passage 53 is formed by cutting, and the central axis of the moving passage 53 and the central axis of the flow path 52 along the Z axis are substantially. It is molded to match. As a result, the valve body 55 has a cutting surface 53P generated by continuous cutting from the portion of the second component 357 of the moving passage 53 to the portion of the first component 356 of the moving passage 53 on the inner surface of the moving passage 53. .. In the closing valve 50 shown in FIG. 13, other parts having the same reference numerals as those in the above embodiment are the same components as the closing valve 50 in the above embodiment.

(3-4) Modification 1D
In the above embodiment, the case where the outer circumferences of the first parts 56, 76, and 356 are hexagonal is described as an example. This is because when the refrigerant pipes 12, 13 are fastened to the first parts 56, 76, 356 with the flare nuts 60, 80, the first parts 56, 76, 356 are changed to the second parts 57, 77, 157 by the tightening torque. , 257, 357, and acts as a detent to prevent rotation. When the outer circumferences of the first parts 56, 76, 356 are circular, the fastening torque is applied to the joint portion (joint surface BS1) of the first parts 56, 76, 356, and there is a risk that the joint portion will be destroyed. For example, when the outer circumference of the first component 56, 76, 356 is hexagonal, the fastening torque can be received by the second component 57, 77, 157, 257, 357, and the joint portion (joint surface BS1) is destroyed. It becomes difficult to occur. The shape that acts as a detent is not limited to a hexagon, and may be another polygon. Further, the shape that acts as a detent may be an oval shape, an oval shape, or a circular shape cut out by a straight line. Oval shapes include at least oval, oval and oval shapes. Further, the oval shape or the shape obtained by cutting out a circular shape with a straight line is a shape in which a straight line and a curved line are combined, for example, a semicircle.

(3-5) Modification 1E
In the above embodiment, the case where the refrigerant pipes 26 and 27 are brazed to the closing valve mounting plate 46 has been described. However, the refrigerant pipes 26 and 27 may be directly joined to the second parts 57, 77, 157, 257 and 357 of the valve bodies 55 and 75. The bonding between the refrigerant pipes 26, 27 and the second component 57, 77, 157, 257, 357 is performed by, for example, brazing. FIG. 14 shows a state in which the refrigerant pipe 26 is joined to the tapered portion 57t in the fitting portion 57d of the second component 57 at the joint surface BS3. In such a case, after the joining of the refrigerant pipes 26, 27 and the second parts 57, 77, 157, 257, 357 is completed, the closing valve mounting plate is attached to the second parts 57, 77, 157, 257, 357. The 46 may be brazed, and at the same time as the refrigerant pipes 26, 27 and the second parts 57, 77, 157, 257, 357 are joined by brazing in the furnace, the closing valve mounting plate 46 and the second part 57, Brazing with 77,157,257,357 may be performed. In a configuration in which the refrigerant pipes 26 and 27 are directly joined to the second parts 57, 77, 157, 257 and 357 of the valve bodies 55 and 75, leakage of the refrigerant is less likely to occur.

(3-6) Modification 1F
In the above modification 1E, the case where the refrigerant pipes 26 and 27 are directly joined to the second parts 57, 77, 157, 257 and 357 of the valve bodies 55 and 75 has been described, but the refrigerant pipes 26 and 27 are the valve body 55. , 75 may be directly joined to the first parts 56, 76, 356. The joining of the refrigerant pipes 26, 27 and the first parts 56, 76, 356 is performed by, for example, brazing. FIG. 15 shows a state in which the refrigerant pipe 26 is joined to the first component 56 at the joint surface BS4. In such a case, the closing valve mounting plate 46 may be brazed to the first parts 56, 76, 356 after the joining of the refrigerant pipes 26, 27 and the first parts 56, 76, 356 is completed. Further, the closing valve mounting plate 46 and the first parts 56, 76, 356 may be joined at the same time as the refrigerant pipes 26, 27 and the first parts 56, 76, 356 are joined by brazing in the furnace. .. In the configuration in which the refrigerant pipes 26 and 27 are directly joined to the valve bodies 55 and 75, leakage of the refrigerant is less likely to occur. In the configuration in which the refrigerant pipes 26 and 27 are directly joined to the first parts 56, 76 and 356 of the valve bodies 55 and 75, leakage of the refrigerant is less likely to occur. In particular, when the refrigerant pipes 26 and 27 are copper pipes, if they are joined to the first parts 56, 76, 356 containing copper, the problem of electrolytic corrosion is unlikely to occur.

(4) Features (4-1)
The closing valves 50 and 70 described above are connected between the refrigerant pipes 12 and 13 which are the first refrigerant pipes extending to the utilization unit 30 and the refrigerant pipes 26 and 27 which are the second refrigerant pipes of the heat source unit 20. In this state, the flow paths 52 and 72 for flowing the refrigerant between the refrigerant pipes 12 and 13 and the refrigerant pipes 26 and 27 are provided inside, and the flow paths 52 and 72 are configured to be switched between opening and closing. In such closing valves 50 and 70, the strength of the second material constituting the second component 57, 77, 157, 257, 357 is larger than the strength of the first material constituting the first component 56, 76, 356. It is configured to be. The strengths of these first and second materials are compared by a tensile test (because of the cylindrical shape, No. 11 test piece) conforming to JIS standard Z2241. For example, as compared with the case where the entire closing valve is made of the first material, the second material having a strength higher than that of the first material, such as the closing valves 50 and 70, is used as the second component 57, 77, 157, 257. , 357 are configured to improve the strength of the second component 57, 77, 157, 257, 357. Thus, the strength of the second material is greater than the strength of the first material. Since the strength of the second parts 57, 77, 157, 257, 357 can be increased, the second parts 57, 77, 157, including the valve body accommodating portions 57a, 77a through which the moving passages 53, 73 pass, Since the 257 and 357 are less likely to be deformed, it is possible to provide the closing valves 50 and 70 that are light and less likely to leak the refrigerant.

(4-2)
While iron is contained in the second material constituting the second parts 57, 77, 157, 257, 357 including the valve body accommodating portions 57a, 77a, the first refrigerant pipes 12 and 13 are connected to the first refrigerant pipes. Since copper is contained in the first material constituting the first parts 56, 76, 356 including the one connecting portions 56a, 76a, the strength of the second parts 57, 77, 157, 257, 357 is adjusted to the strength of the first part 56. , 76, 356 is easier to increase and the first connection portions 56a, 76a are easier to process. As a result, it is possible to inexpensively provide the closing valves 50 and 70 in which the refrigerant is less likely to leak from the valve body accommodating portions 57a and 77a and the first connecting portions 56a and 76a. Further, when the second material containing iron is stainless steel, the second parts 57, 77, 157, 257, 357 can be made hard to rust.

(4-3)
Since the first part 56,76,356 and the second part 57,77,157,257,357 of the separate parts are brazed to each other, the first part 56,76,356 and the second part 57,77, 157, 257, 357 can be tightly coupled. As a result, even if stress is applied when the refrigerant pipes 12, 13 are connected to the first parts 56, 76, 356, the first parts 56, 76, 356 and the second parts 57, 77, 157, 257, 357 It is possible to maintain the dimensional accuracy between them and suppress an increase in the risk of refrigerant leakage. In particular, in the case of brazing in a furnace, the bond strength of the first part 56,76,356 and the second part 57,77,157,257,357 varies as compared with the case of manual brazing. It can be suppressed.

(4-4)
The first connecting portions 56a and 76a connected to the refrigerant pipes 12 and 13, which are the first refrigerant pipes that have been flared, are made of the second material constituting the second parts 57, 77, 157, 257 and 357. Since it is sufficient to use the first material having low strength, the range of selection of the first material is widened, and it becomes easy to select a material having good processing accuracy as the first material. The first connection portions 56a and 76a can be made of, for example, brass, and the dimensional accuracy of the first connection portions 56a and 76a that can be connected to the flared refrigerant pipes 12 and 13 without gaps can be easily realized.

(4-5)
In the above embodiment, the support portions 57b, 77b are also included in the second parts 57, 77,357, the third material constituting the support portions 57b, 77b is the same as the second material, and the strength of the third material is high. Greater than the strength of the first material. As a result, it becomes easy to give high strength to the support portions 57b and 77b, and even if stress is applied to the support portions 57b and 77b each time the refrigerant pipes 12 and 13 are connected to the first connection portions 6a and 76a, the support portions 57b, It becomes easy to suppress the risk of leakage of the refrigerant from the fitting portion 57d and the valve body accommodating portion 57a, which are the second connecting portions, due to the deformation starting from 77b.

In particular, since the support portions 57b and 77b extend in a ring shape from the base portion of the cylindrical second component 57, 77, 357, when the base portion of the cylindrical second component 57, 77 is used as it is as the support portion. Higher strength is obtained.

(4-6)
Since the support portions 57b and 77b are included in the second parts 57 and 77 and the valve body accommodating portions 57a and 77a to the support portions 57b and 77b are one component, the valve body accommodating portions 57a and 77a to the support portions 57b , 77b can be easily increased. For example, when molding the valve body accommodating portions 57a and 77a to the support portions 57b and 77b from a single stainless steel cylindrical pipe, a ready-made stainless steel pipe can be used, so that the cost of raw materials can be reduced. It becomes easy to reduce.

(4-7)
As described in the above modification 1A, when the support portion 57b is composed of the third component 159, the support portion 57b spreading in a ring shape is processed without affecting the processing of the second component 157. This makes it easier to obtain the valve body accommodating portion 57a with high dimensional accuracy. For example, the second part 157 is formed by bulge processing and cutting processing, and the third part 159 is formed by forging processing. Can be facilitated.

(4-8)
As described in the above modification 1B, when the service port is included in the second component 257, the service port can also be made of a second material, for example, stainless steel, so that the strength of the service port is increased and the refrigerant leaks from the service port. The risk of

(4-9)
As described in the above modification 1C, when the service port is included in the first component 356, the service port can also be composed of the first material, so that the processing accuracy of the service port is improved and the risk of refrigerant leakage from the service port is increased. Can be reduced.

Although the embodiments of the present disclosure have been described above, it will be understood that various modifications of the forms and details are possible without departing from the purpose and scope of the present disclosure described in the claims. ..

10 Air conditioner 12, 13 Refrigerant piping (example of first refrigerant piping)
26, 27 Refrigerant piping (example of second refrigerant piping)
20 Heat source unit 30 Utilization unit 50, 70 Closed valve 51, 71 Valve body 52, 72 Flow path 53, 73 Movement passage 56, 76, 356 First part 56a, 76a First connection 57, 77, 157, 257, 357 Second part 57a, 77a Valve body accommodating part 57b, 77b Support part 57d, 77d Fitting part (second connection part)
159 3rd part

Japanese Unexamined Patent Publication No. 2013-242038

Claims (7)

The first refrigerant pipe and the first refrigerant pipe (26, 27) connected to the first refrigerant pipe (12, 13) extending to the utilization unit (30) and the second refrigerant pipe (26, 27) of the heat source unit (20). 2 A closing valve (50, 70) having a flow path (52, 72) for flowing a refrigerant between the refrigerant pipes and switching the opening and closing of the flow path.
A valve body (51, 71) configured to be able to move through a moving passage (53, 73) between a first position for closing the flow path and a second position for opening the flow path. ,
The first component (56,76,356) including the first connection portion (56a, 76a) connected to the first refrigerant pipe, and
It is provided with a second component (57, 77, 157, 257, 357) including a valve body accommodating portion (57a, 77a) for accommodating the valve body located at the second position.
The first component and the second component are separate components, and the strength of the second material constituting the second component is larger than the strength of the first material constituting the first component, and the first material Contains copper and the second material contains iron
The first connection portion is connected to the first refrigerant pipe that has been flared .
Closing valves (50, 70) in which the first component and the second component are brazed to each other. A second connection portion (57d, 77d) connected to the second refrigerant pipe and a support portion (57b, 77b) fixed to the heat source unit are further provided.
The strength of the third material constituting the second connecting portion and the supporting portion is larger than the strength of the first material.
The closing valve (50, 70) according to claim 1. A third component (159) including the support portion is provided.
The third part and the second part are separate parts.
The closing valve (50, 70) according to claim 2. The second component (257) includes a service port for filling the heat source unit with a refrigerant.
The shutoff valve (50) according to any one of claims 1 to 3. The moving passage and the valve body are threaded to move the valve body.
The shutoff valve (50) according to any one of claims 1 to 4. Utilization unit (30) and
A heat source unit (20) having a first refrigerant pipe (12, 13) and a second refrigerant pipe (26, 27) extending to the utilization unit,
It has internal flow paths (52, 72) for flowing a refrigerant between the first refrigerant pipe and the second refrigerant pipe in a state of being connected between the first refrigerant pipe and the second refrigerant pipe. The air conditioner (10) comprising the closing valve (50, 70) according to any one of claims 1 to 5 , which switches the opening and closing of the flow path. The air conditioner (10) according to claim 6 , further comprising a flare nut for fastening the first refrigerant pipe and the first connection portion of the first component of the closing valve.

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