JP3315349B2 - solenoid valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve for switching the flow path of an absorbing liquid or a refrigerant liquid in an absorption cycle of an absorption refrigeration system using an aqueous solution of lithium bromide or the like as an absorbing liquid. Related to the structure.

[0002]

2. Description of the Related Art In an absorption refrigeration system, a low-concentration absorbing solution is heated and boiled by a burner in a regenerator to separate a high-concentration absorbing solution from refrigerant vapor. The refrigerant vapor separated by the regenerator is cooled by the condenser to become a refrigerant liquid. The high-concentration absorbent separated by the regenerator is used as an absorption tube (absorption coil) in the absorber
When the refrigerant liquid is sprayed on the evaporator tube (evaporation coil) in the evaporator provided in communication with the absorber, the refrigerant liquid is vaporized from the cold and hot water passing through the evaporator tube on the evaporator tube surface. It takes away heat and evaporates, while on the surface of the absorption tube,
The high concentration absorbing liquid absorbs the refrigerant vapor and generates heat.

[0003] The cold and hot water whose heat has been removed by the evaporating tube circulates through a heat exchanger provided on the object to be cooled by the operation of the pump and becomes a cooling source in the object to be cooled. Conversely, the cooling water whose temperature has risen in the heat exchanger is cooled again by the evaporating tube. On the other hand, the heat generated when the absorbing liquid absorbs the refrigerant vapor on the surface of the absorption pipe moves to the cooling tower provided outside by the cooling water for exhaust heat passing through the absorption pipe by the operation of the pump, and is cooled. Released at the tower. The absorption cycle is configured such that the absorption liquid that has been reduced in concentration by absorbing the refrigerant liquid in the absorber is returned to the regenerator by the absorption liquid pump.

In the absorption refrigerating apparatus having the above-described structure, the absorption liquid heated by the regenerator is directly supplied to the evaporator without depending on the absorption cycle, and the cold and hot water circulating in the evaporation coil is heated. In some cases, the device is used for heating operation. In such an apparatus, an electromagnetic valve for switching between cooling and heating (hereinafter referred to as a cooling and heating switching valve) for switching between cooling operation and heating operation is provided in an absorbent pipe connecting the regenerator and the evaporator. The flow path of the absorbing liquid is switched according to the operation indicated by.

Further, at the start of the cooling operation, due to the delay of the generation of the refrigerant liquid with respect to the generation of the high-concentration absorption liquid, the absorption of the vapor refrigerant in the evaporator excessively proceeds in the absorber, and the evaporator and the absorber In order to prevent the refrigerant liquid from freezing due to a decrease in pressure, an electromagnetic valve provided in the refrigerant liquid flow path is provided to supply the refrigerant liquid stored in the condenser to the evaporator at the start of the refrigerant operation. Open the valve.

Conventionally, in an absorption refrigerating apparatus having such a structure, as a cooling / heating switching valve or a solenoid valve for a refrigerant liquid passage, a round rod or block material is machined by cutting to form a valve body. Piping such as an absorption liquid flow path and a refrigerant liquid flow path is joined to the valve body by welding or the like, and a guide cylinder of a plunger for driving the valve body is formed by connecting a cylindrical member separate from the valve body to an electromagnetic coil. It was formed by inserting it in the center.

[0007]

As described above, the conventional valve structure in which the valve body is manufactured and molded by cutting requires a complicated work process of cutting a block material or the like. The manufacturing cost increases because of the complexity and the number of parts. In addition, since it is necessary to seal the plunger guide tube and connect it to the valve body once processed, it is necessary to take sufficient measures against leakage of liquid such as absorption liquid and refrigerant liquid at the connection portion. In addition, there is a problem that the manufacturing cost is increased because of the separate members.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an inexpensive valve structure which is excellent in reliability against fluid leakage and which is inexpensive in an electromagnetic valve for switching a fluid flow path.

In the solenoid valve according to the present invention, a part of a metal pipe forming a fluid flow path is expanded to form a large-diameter part larger than the material diameter of the metal pipe and a small-diameter part that is the material diameter of the metal pipe. The large diameter portion is formed as a valve chamber, and a side pipe that opens to the side of the valve chamber and communicates with the valve chamber is bonded to the outside thereof, and the valve chamber is provided inside the valve chamber. For controlling the movement of fluid between the metal pipe and the side pipe, a valve structure consisting of a valve body and a valve seat is arranged, and the small diameter portion has a plunger that holds the valve body drivably inside. In addition to the guide cylinder disposed, electromagnetic valve driving means comprising a coil for driving the plunger in the direction opposite to the valve chamber by energization is provided outside and closed, and the valve structure and the electromagnetic valve driving means are closed. Controlling the communication between the large-diameter portion of the metal pipe and the side pipe from To.

[0010]

[0011]

According to the present invention, a large-diameter portion and a small-diameter portion are formed by expanding a metal pipe forming a fluid flow path, and a valve chamber is formed in the large-diameter portion. Is provided with a valve structure including a valve body and a valve seat, and the small diameter portion of the metal pipe is used as a guide cylinder of a plunger which is displaced by the electromagnetic force of the electromagnetic coil of the electromagnetic valve driving means and is closed. The side of the valve chamber is opened, and a side pipe communicating with the valve chamber is connected to the outside thereof. As described above, the electromagnetic valve driving means and the valve structure are constituted, and the fluid passes when the electromagnetic valve is opened, and is blocked when the electromagnetic valve is closed.

When the solenoid valve constructed as in the present invention is used, when the valve chamber is formed, the metal pipe is formed into a large diameter having a passage area capable of securing a fluid flow rate by expanding the metal pipe. Since processing is easy and processing such as cutting is not required, manufacturing cost can be suppressed and cost can be reduced.

In the manufacturing process of the solenoid valve, the small-diameter portion of the metal pipe that is not expanded can be used as the guide cylinder of the plunger, so that it is not necessary to separately connect a pipe such as the guide cylinder, and the solenoid valve and the guide are not connected. Since there is no need to take measures against leakage at the connection with the cylinder, reliability is improved.

In the case where the solenoid valve is provided in the absorption cycle, the number of welding points for holding the vacuum can be reduced, so that the manufacturing cost of the absorption refrigeration apparatus can be reduced and the reliability of the vacuum holding can be reduced. The performance is improved. If the pipe expansion process is not performed using a large-diameter metal pipe that can secure the flow rate of the fluid, the guide cylinder of the plunger also has a large diameter, which increases the size of the electromagnetic coil and the plunger, thereby increasing costs. At the same time, it becomes an obstacle to miniaturization and has problems.

[0016]

FIG. 1 shows an embodiment of an air conditioner according to the present invention. The air conditioner includes an outdoor unit 100 as an absorption refrigeration unit and an indoor unit RU.
Is the refrigerator main body 101 and the cooling tower (cooling tower) C
And T. The air conditioner is controlled by the control device 10
2 is controlled.

The refrigerator main body 101 is mainly formed of stainless steel, and forms an absorption cycle of a refrigerant and an aqueous solution of lithium bromide as an absorbing liquid. A high-temperature regenerator provided with a gas burner B as a heating means below. 1 and a low-effect regenerator 2 arranged so as to cover the outside of the high-temperature regenerator 1, and absorption absorbers arranged outwardly on the outer periphery of the low-temperature regenerator 2 in order. Vessel 3
The evaporator 4 is connected to the condenser 5 disposed above the absorber 3 and the evaporator 4 on the outer periphery of the low-temperature regenerator 2 through several passages. Note that the absorbing solution contains an inhibitor for suppressing corrosion due to the reaction between stainless steel and lithium bromide.

The high-temperature regenerator 1 is provided above the heating tank 11 heated by the gas burner B with the medium-concentration absorbent separating cylinder 1.
2, a vertical cylindrical airtight refrigerant recovery tank 10 is provided so as to cover the outer periphery of the medium-concentration absorbing liquid separation tube 12 from above.

Below the middle concentration absorbing liquid separation cylinder 12,
An absorbent partitioning vessel 13 arranged at a distance from the inner wall of the medium-concentration absorbent separation tube 12 is provided with several upper edge portions joined to the inside of the medium-concentration absorbent separation tube 12,
Between the medium-concentration absorbing liquid separating cylinder 12 and the absorbing liquid partitioning vessel 13, an absorbing liquid rising flow path 14 in which the absorbing liquid heated in the heating tank 11 rises is formed.

Absorbent liquid returning plate 15 for returning the absorbing liquid rising in absorbing liquid ascending passage 14 is provided in medium concentration absorbing liquid separating cylinder 12 above absorbing liquid partitioning vessel 13.
The above-mentioned medium-concentration absorbent separation cylinder 12 is provided with the absorbent return plate 1.
The upper and lower members 5 and 5 are joined by welding to the absorbing liquid return plate 15.

At the side of the absorption liquid partitioning vessel 13, the medium-concentration absorption liquid from which the refrigerant has been separated and made highly concentrated is supplied to the low-temperature regenerator 2.
An inlet of the medium-concentration absorbent flow path L1 for supplying to the evaporator 4 is provided at the bottom of the absorbent-liquid partition container 13 for supplying the heated absorbent to the evaporator 4 during the heating operation. The inlet of the heating absorbent flow path L4 is open.

Inside the lower part of the refrigerant recovery tank 10, a refrigerant partitioning cylinder 17 for forming a heat insulating gap 17a between itself and the medium concentration absorbing liquid separating cylinder 12 is provided.
Is joined to. Thereby, the medium concentration absorbing liquid separating cylinder 1
2 is shut off, and the refrigerant in the refrigerant recovery tank 10
It is no longer heated by the high-temperature absorbing liquid in the absorbing liquid rising flow path 14. The inside of the refrigerant recovery tank 10 outside the refrigerant partition tube 17 is a refrigerant storage part 10a for storing the separated refrigerant, and the refrigerant storage part 10a has an inlet of a refrigerant flow path L5 communicating with the condenser 5. It is open.

With the above configuration, the high-temperature regenerator 1 heats the low-concentration absorbing liquid contained in the heating tank 11 by the gas burner B, evaporates water as a refrigerant in the low-concentration absorbing liquid, and cools the refrigerant. Separated as vapor (steam) to the outside of the medium-concentration absorption liquid separation tube 12, and the medium-concentration absorption liquid concentrated by evaporation of the refrigerant vapor is returned into the absorption liquid partitioning container 13 inside the medium-concentration absorption liquid separation tube 12, Medium concentration absorbent flow path L
1 supplies it to the low-temperature regenerator 2. Further, the separated refrigerant vapor is recovered in the refrigerant recovery tank 10 and supplied to the condenser 5 through the refrigerant flow path L5.

The low-temperature regenerator 2 is a vertical cylindrical low-temperature regenerator case 2 installed eccentrically on the outer periphery of the refrigerant recovery tank 10.
0, a refrigerant vapor outlet 21 is provided around the ceiling of the low-temperature regenerator case 20. Low temperature regenerator case 20
The top of the ceiling is connected to the inside of the absorption liquid partitioning vessel 13 in the medium concentration absorption liquid separation tube 12 via the heat exchanger H by the medium concentration absorption liquid flow path L1.

An orifice (not shown) for restricting the flow rate of the medium concentration absorbing liquid flowing from the absorbing liquid partitioning vessel 13 to the low temperature regenerator 2 is provided in the medium concentration absorbing liquid flow path L1. The medium-concentration absorbing liquid is supplied into the container case 20 by a pressure difference from the medium-concentration absorbing liquid separating cylinder 12.
(Approximately 70 mmHg in the low-temperature regenerator case 20 and approximately 700 mmHg in the medium-concentration absorbent separation tube 12)

Thus, the low-temperature regenerator 2 reheats the medium-concentration absorbent supplied into the low-temperature regenerator case 20 by using the outer wall of the refrigerant recovery tank 10 as a heat source, and the medium-concentration absorbent is supplied to the low-temperature regenerator case. The refrigerant vapor and the high-concentration absorption liquid are separated by the gas-liquid separation section 22 above the high-concentration absorption liquid 20, and the high-concentration absorption liquid is stored in the high-concentration absorption liquid receiving section 23. At the bottom of the high-concentration absorbent receiving section 23, an inlet of a high-concentration absorbent flow path L2 communicating with the absorber 3 is opened.

On the outer periphery of the low-temperature regenerator case 20, a vertical cylindrical airtight evaporating / absorbing case 30 is concentrically disposed at a lower portion, and a condenser case 50 is concentrically disposed at an upper portion. , The low-temperature regenerator case 20 and the evaporating / absorbing case 30 are integrally welded to the bottom plate 18, and the inner end of the bottom plate 18 is welded to the outer peripheral surface of the lower member 12 b of the medium-concentration absorbent separation cylinder 12. Thus, the refrigerator main body 101 is formed. The inside of the low-temperature regenerator case 20 communicates with the inside of the condenser case 50 via the refrigerant vapor outlet 21 and the gap 5A.

The absorber 3 is an absorption pipe in which a copper pipe is wound in a vertical cylindrical shape between an inner part in the evaporating / absorbing case 30 and the low-temperature regenerator case 20, and cooling water for exhaust heat flows inside. An absorption coil 31 wound in a coil shape is disposed, and a high-concentration absorbing solution is supplied above the absorption coil 31.
A high-concentration absorbing liquid spraying device 32 for spraying the liquid is disposed.

As shown in FIG. 2, the high-concentration absorbing liquid spraying device 32 includes a high-concentration absorbing liquid passage L2 connected to the high-concentration absorbing liquid receiving portion 23 of the low-temperature regenerator 2 through a heat exchanger H. Liquid cooling container 32a, which cools by receiving and storing the high-concentration absorbing liquid supplied through
In order to evenly distribute and drip the absorbent collected in the above on each circumference of the inner and outer doubly wound absorbing coils 31, two absorbent liquid dispersing tubes 32b formed doubly are used. Be composed.

With the above configuration, in the absorber 3, the high-concentration absorbent in the high-concentration absorbent receiving portion 23 of the low-temperature regenerator 2 flows in from the high-concentration absorbent flow path L2 due to the pressure difference, and the high-concentration absorbent flowing in The liquid is sprayed on the upper end of the absorbing coil 31 by the high-concentration absorbing liquid spraying tool 32, adheres to the surface of the absorbing coil 31 to form a thin film, flows downward by the action of gravity, absorbs water vapor, and absorbs water vapor. It becomes an absorbing solution. When absorbing the water vapor, heat is generated on the surface of the absorption coil 31.
1 is cooled by the cooling water for exhaust heat circulating in 1. The water vapor absorbed by the absorbing liquid is generated as refrigerant vapor in the evaporator 4 described later.

The bottom 33 of the absorber 3 is connected to the bottom of the heating tank 11 by a low-concentration absorbent flow path L3 to which a heat exchanger H and an absorbent pump P1 are attached. The low-concentration absorbing liquid in the absorber 3 is supplied into the heating tank 11. In addition, the cooling water for exhaust heat cooled by the cooling tower CT circulates in the absorption coil 31 during the cooling operation.

The evaporator 4 is provided on the outer periphery of a vertical cylindrical partition plate 40 having a plurality of communication ports (not shown) provided on the outer periphery of the absorption coil 31 in the evaporator / absorber case 30, and the inside for cooling and heating. A vertical cylindrical evaporating coil 41 made of a copper tube through which cold and hot water flows is provided, and a refrigerant liquid sprayer 42 is attached above the evaporating coil 41. The bottom 43 of the evaporator 4 is in communication with the bottom of the absorbent partitioning vessel 13 in the medium-concentration absorbent separation cylinder 12 through a heating absorbent flow path L4 having an electromagnetic cooling / heating switching valve 6.

With the above configuration, in the evaporator 4, when the refrigerant liquid (water) is caused to flow down from the refrigerant liquid sprayer 42 onto the evaporation coil 41 during the cooling operation, the flowed refrigerant liquid is evaporated by the surface tension. 41 is wetted on the surface to form a film.
In the evaporating / absorbing case 30 of Hg), the evaporating heat is taken from the evaporating coil 41 to evaporate, and the air-conditioning cold / hot water flowing in the evaporating coil 41 is cooled.

Next, the condenser 5 will be described. The condenser 5 is
A cooling coil 51 in which cooling water for exhaust heat cooled by the cooling tower CT circulates is provided inside the condenser case 50. As shown in FIG. 2, the condenser case 50 closes an opening above the evaporating / absorbing case 30 and forms a bottom plate of the condenser case 50, and forms a condenser chamber covering the boundary plate 52. And a condenser cover plate 53.

Between the cooling coil 51 and the boundary plate 52,
A refrigerant liquid receiving portion 50a for receiving the refrigerant liquid in which the refrigerant vapor cooled by the cooling coil 51 is liquefied in the condenser case 50 is provided, and the refrigerant liquid receiving portion 50a is provided via a refrigerant liquid supply path L6. A refrigerant cooler that communicates with the refrigerant cooler 54 and is provided below the boundary plate 52 for cooling the refrigerant to be sprayed to the high-concentration absorbent sprayer 32 of the absorber 3 and the evaporator coil 41 of the evaporator 4. A boundary plate assembly is pre-assembled together with 54 to form a boundary plate assembly.

The condenser cover plate 53 has a cooling coil 51 provided therein as a coil support fitting 51a, and an eliminator 55 composed of a number of members including a part of the medium-concentration absorbent flow path L1 previously assembled. A condenser assembly is formed. Further, between the condenser 5 and the refrigerant cooler 54 in the evaporator 4, the inside of the condenser case 50 and the inside of the refrigerant cooler 54 are directly communicated without passing through the refrigerant liquid receiving portion 50 a, and the condenser case Refrigerant liquid flow path L for letting the refrigerant liquid stored in 50 flow
The refrigerant liquid flow path L7 is provided with an electromagnetic refrigerant valve 7 that is closed during normal operation and is opened at the start of operation and the like. Note that both ends of the cooling coil 51 are arranged adjacent to the outer peripheral portion of the condenser cover plate 53 as an inflow portion and an outflow portion to the condenser 5, respectively.

The condenser 5 having the above structure is provided with a refrigerant storage section 1 of a refrigerant recovery tank 10 through a refrigerant flow path L5 provided with an orifice (not shown) for restricting the flow rate of the refrigerant.
0a, and also communicates with the low-temperature regenerator 2 through the refrigerant vapor outlet 21 and the gap 5A, and the refrigerant is supplied by a pressure difference (about 70 mmHg in the condenser case).

In the condenser 5, the refrigerant vapor supplied into the condenser case 50 is cooled by the cooling coil 51 and liquefied. Refrigerant liquid receiving part 50 provided at the lower part of condenser 5
a and the refrigerant liquid dispersing device 42 disposed above the evaporating coil 41 of the evaporator 4 are communicated with each other through a refrigerant liquid supply path L6.
The liquefied refrigerant liquid normally accumulates in the refrigerant liquid receiving portion 50a, and is then supplied to the refrigerant liquid disperser 42 through the refrigerant liquid supply path L6 and the refrigerant cooler 54.

With the above structure, the absorbing liquid is supplied to the high-temperature regenerator 1 → the medium-concentration absorbing liquid channel L1 → the low-temperature regenerator 2 → the high-concentration absorbing liquid channel L2 → the high-concentration absorbing liquid spraying tool 32 → the absorber 3 → It circulates in the order of the absorbent pump P 1 → the low concentration absorbent flow path L 3 → the high temperature regenerator 1. The refrigerant is a high-temperature regenerator 1 (refrigerant vapor) → refrigerant flow path L5 (refrigerant vapor) or a low-temperature regenerator 2 (refrigerant vapor) → condenser 5 (refrigerant liquid) → refrigerant liquid supply path L6 (refrigerant liquid) or Refrigerant liquid flow path L7 (refrigerant liquid) → refrigerant cooler 54
→ Refrigerant liquid sprayer 42 (refrigerant liquid) → Evaporator 4 (refrigerant vapor)
→ The absorber 3 (absorbent) → the absorbent pump P1 → the low-concentration absorbent flow path L3 → the high-temperature regenerator 1 circulate in this order.

The above-described absorption coil 31 of the absorber 3 that exchanges heat with the absorption liquid and the cooling coil 51 of the condenser 5 are connected to form a continuous coil. The cooling water circulation path is formed by being connected to the CT. In this cooling water circuit, the absorption coil 3
A cooling water pump P2 for sending cooling water into the continuous coil is provided in a cooling water flow path 34 between the inlet of the cooling tower CT and the cooling tower CT.
The cooling water which passes through the continuous coil by the operation of the cooling water pump P2 absorbs the heat of absorption by the absorption coil 31 and the heat of condensation by the cooling coil 51, and becomes relatively high in temperature. Supplied to CT.

With the above configuration, during the cooling operation, the cooling water in the cooling tower CT is operated in the order of the cooling tower CT → the cooling water pump P2 → the absorption coil 31 → the cooling coil 51 → the cooling tower CT by the operation of the cooling water pump P2. Circulate. In the cooling tower CT, self-cooling is performed in which the falling cooling water is partially evaporated into the atmosphere to cool the remaining cooling water.
An exhaust heat cycle is formed in which the heat is released into the atmosphere to lower the temperature. Note that the air from the blower S promotes the evaporation of water.

The evaporator coil 41 of the evaporator 4 includes an indoor unit R
The air-conditioning heat exchanger 44 provided in U is connected by a cold / hot water flow path 47, and the cold / hot water pump P3 is connected to the cold / hot water flow path 47.
Is provided. With the above configuration, the evaporating coil 41
The low temperature hot and cold water circulates in the order of the evaporating coil 41 → the cold and hot water channel 47 → the air conditioning heat exchanger 44 → the cold and hot water channel 47 → the cold and hot water pump P3 → the evaporating coil 41.

The indoor unit RU is provided with an air-conditioning heat exchanger 44, and a blower 46 that allows room air to pass through the heat exchanger 44 and blows the indoor air again.

The heating absorbent flow path L4 and the cooling / heating switching valve 6 are provided for heating operation. During the heating operation, the cooling / heating switching valve 6 is opened to operate the absorbing liquid pump P1. As a result, the high-temperature medium-concentration absorbing liquid in the absorbing liquid partitioning vessel 13 in the medium-concentration absorbing liquid separating cylinder 12 flows into the evaporator 4, and the cold and hot water in the evaporating coil 41 is heated, and the heated evaporation The cold and hot water in the coil 41 is supplied from the cold and hot water channel 47 to the air conditioning heat exchanger 44 by the operation of the cold and hot water pump P3, and serves as a heat source for heating. The medium-concentration absorbing liquid in the evaporator 4 enters the absorber 3 through the communication port of the partition plate 40, passes through the low-concentration absorbing liquid flow path L3, and passes through the absorbing liquid pump P1.
To return to the heating tank 11.

In the absorption refrigeration system having the above-described structure, the cooling / heating switching valve 6 and the refrigerant valve 7 are provided in the heating absorption liquid passage L6 and the refrigerant liquid passage L7 to which a large pressure is applied. Each of the flow paths L
6. At the joint with L7, reliability against leakage is required. In addition, in an absorption refrigeration apparatus having a large number of parts, it is desired to reduce the number of parts and the number of processing steps. For this reason, in the present embodiment, the cooling / heating switching valve 6 and the refrigerant valve 7 are connected to the respective flow paths L6,
It is manufactured integrally with L7.

The structure of the cooling / heating switching valve 6 and the refrigerant valve 7 will be described below with reference to the drawings. FIG. 3 shows the cooling / heating switching valve 6 of the present embodiment. In FIG. 3, reference numeral 60 denotes a body, which expands a middle portion of a straight tubular metal pipe forming a part of the heating-use absorbing liquid flow path L4 by bulging to form a large-diameter valve chamber 6.
0a is formed. An opening 60b is provided on the side of the valve chamber 60a.
A pipe 60A that forms an absorbent flow path communicating with the inside of the valve chamber 60a is joined to the outside of the pipe 60A. One small-diameter portion side of the unexpanded body 60 is closed by joining it by brazing or welding after inserting a core 61 at the end, and is plunged by a spring 62 arranged in a recess formed inside the core 61. 63 is elastically supported toward the valve chamber 60a. Therefore, the small diameter portion is used to guide the plunger 63 in the direction facing the valve seat.
c.

At the end of the plunger 63, a ball-shaped valve body 65 is supported by a holder 64. Valve room 6
On the large diameter side of the body 60 opposed to the core 61 and the plunger 63 with the resin ring 6 serving as a valve seat interposed therebetween,
The valve seat holder 67 to which the fixing member 6 is fixed is pressed and compressed from the outside of the body 60 and fixed. An O-ring 68 is inserted and sealed between the groove of the valve seat holder 67 and the body 60 to ensure airtightness. Outside the guide cylinder 60c in which the core 61 and the plunger 63 are accommodated,
A resin bobbin 70 on which an electromagnetic coil 69 for applying an electromagnetic force to the core 61 and the plunger 63 to attract each other is fitted. Electromagnetic coil 6
The bobbin 70 with 9 is provided via a cover 71 made of resin.
A nut 61b is fastened and fixed to a screw portion 61a provided on the core 61 outside the body 60 by a yoke 72. Reference numeral 73 denotes two terminals for energizing the electromagnetic coil 69.

The cooling / heating switching valve 6 configured as described above
Is formed by bulging a body 60 made of a metal tube forming an absorption liquid flow path (here, a heating absorption liquid flow path L4) to form a valve chamber 60a, and a movable region of a plunger 63 in the body 60. Since the guide cylinder 60c is formed integrally to form an absorbent flow path with a solenoid valve, the valve chamber 60a
There is no need to separately join the piping member forming the guide cylinder 60c. Accordingly, leakage resistance and vacuum holding performance can be ensured at a portion corresponding to the junction between the valve chamber 60a and the guide cylinder 60c. Also, the valve chamber 60a and the guide cylinder 60
Since there is no joining with the component c, the number of parts can be reduced, and the number of working steps can be reduced, so that the cost can be reduced.

FIG. 4 shows the refrigerant valve 7 of this embodiment. In the figure,
Components having the same configuration as the cooling / heating switching valve 6 are denoted by the same reference numerals.
The refrigerant valve 7 is characterized in that the diameter of the body 60 is formed to the same size on the guide cylinder 60c side and the valve seat holder 67 side, and that the valve body 65 is directly fixed to the plunger 63. Is different from the cooling / heating switching valve 6. The other parts have almost the same configuration, and thus the description is omitted. With this refrigerant valve 7, the same operation and effect as the cooling / heating switching valve 6 can be obtained. The valve chamber 60a may be bulged so that the diameter of the valve seat holder 67 is the same as that of the valve seat holder 67.

As described above, according to the present invention, in the cooling / heating switching valve 6 and the refrigerant valve 7, the valve chamber 60a is formed by subjecting the body 60 made of a metal pipe forming the flow path of the absorbing liquid or the refrigerant liquid to bulge processing. In addition, since the guide cylinder 60c serving as a movable area of the plunger 63 is formed in the body 60 to provide a flow path with an electromagnetic valve, it is necessary to separately connect the valve chamber 60a and a pipe member forming each flow path. There is no. Therefore, leakage-proof performance can be ensured at a portion corresponding to the junction between the valve chamber 60a and the guide cylinder 60c. Further, since there is no connection between the valve chamber 60a and the guide cylinder 60c, the number of parts can be reduced, and the number of working steps can be reduced, so that the cost can be reduced.

In each of the above embodiments, the bulge processing is performed as the pipe expansion processing. However, the present invention is not limited to the bulge processing, and other pipe expansion processing may be performed. In the above embodiment, the cooling / heating switching valve 6 is opened during the heating operation and closed during the cooling operation. However, after the cooling operation is completed, the dilution operation is performed. May be. In each of the above embodiments, the cooling tower CT of the cooling water flow path 34 is an open type in which a part of the cooling water is evaporated to self-cool the cooling water. A water cooling device that forms a closed circuit that is not open to the atmosphere may be used. In the above embodiment, only the air conditioner heat exchanger 44 is provided in the indoor unit RU. However, in order to perform the dehumidifying operation without lowering the room temperature, the air once cooled by the air conditioner heat exchanger 44 is heated. The heating heat exchanger may be provided in parallel with the air conditioning heat exchanger 44. Although the air conditioner using the absorption refrigeration apparatus has been described in the above embodiment, the air conditioning apparatus may be used for other refrigeration apparatuses such as a refrigerator and a freezer. In the above embodiment, the double-effect type has been described, but a single-effect type may be used. As a heating source, an oil burner or an electric heater may be used.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an air conditioner showing an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a refrigerator main body showing a combination part with a condenser and an evaporator in an embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating a structure of a cooling / heating switching valve according to the embodiment of the present invention.

FIG. 4 is a sectional view showing a structure of a refrigerant valve according to the embodiment of the present invention.

[Explanation of symbols]

 101 Refrigerator body (absorption refrigeration system) 6 Cooling / heating switching valve (solenoid valve, solenoid valve with absorbent liquid flow path) 7 Refrigerant valve (solenoid valve, electromagnetic valve with refrigerant liquid flow path) 60 Body (metal pipe, fluid flow path) 60a Valve chamber 60b Opening 60c Guide cylinder (small diameter cylinder) 60A Pipe (side piping) 61 Core (electromagnetic valve driving means) 63 Plunger (electromagnetic valve driving means) 65 Valve (valve structure) 67 Valve seat holder ( Valve seat member, valve structure) 69 Electromagnetic coil (electromagnetic valve driving means)

Continuation of front page (72) Inventor Koji Hanyu 1211-4 Nukuda-cho, Hachioji-shi, Tokyo Inside T-K Co., Ltd. (56) References JP-A-7-190236 (JP, A) JP-A-10-274129 (JP, A JP-A-61-242732 (JP, A) JP-A-56-47973 (JP, U) JP-A-56-99167 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16K 31/06-31/11 F25B 41/04

Claims (1)

(57) [Claims] A metal pipe forming a fluid flow path is partially expanded to form a large-diameter portion larger than a material diameter of the metal pipe.
A small-diameter portion, which is the material diameter of the metal tube, is integrally formed, the large-diameter portion is used as a valve chamber, and a side pipe that opens to the side of the valve chamber and communicates with the valve chamber outside the valve chamber. In the valve chamber, a valve structure comprising a valve body and a valve seat for controlling the movement of fluid between the metal pipe and the side pipe is arranged, and the small diameter portion is provided on the inner side. A guide cylinder provided with a plunger for holding the valve drivably is provided, and electromagnetic valve driving means including a coil for driving the plunger in the opposite direction of the valve chamber by energization is provided outside and closed. An electromagnetic valve, wherein communication between the large-diameter portion of the metal pipe and the side pipe is controlled by the valve structure and the electromagnetic valve driving means.