JP2002195699A - Bidirectional solenoid valve and air conditioner provided with the valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bidirectional solenoid valve and air conditioner provided with the valve, which is suitable for a restricting device for dehumidification enabling cooling/heating operation and a cooling dehumidification, and a heating dehumidification in an air conditioner employing refrigeration cycle. SOLUTION: A normally opened solenoid valve is provided with a valve body 14, a solenoid coil 18, and a plunger 3 driving valve elements 12a, 12b by the magnetic force of the solenoid coil in the closing direction. Two valve parts 30A, 30B are constituted of two valve chests formed in the valve body 14, valve seats 22a, 22b partitioning the valve chest into the inside and to the outside, and valve elements 12a, 12b placed respectively facing the valve seats. Inner valve chests 23 are made to communicate with each other in the valve body 14, refrigerant pipes 28, 29 are connected respectively to outside valve chest 23a, 23b. When both valve elements 12a, 12b are closed, they are movable in the valve-open direction slightly by a stroke S by means of refrigerant pressure of the refrigerant pipe. Both valve bodies 12a, 12b are provided with a refrigerant restriction function in cooperation with bleed channels formed in the valve seats 22a, 22b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-way solenoid valve and a refrigeration cycle type air conditioner using the two-way solenoid valve. The present invention relates to an air conditioner capable of performing the following.

[0002]

2. Description of the Related Art Conventionally, an air conditioner which performs cooling, heating, and cooling dehumidification (dry mode) using a refrigeration cycle is generally widely known under the name of "air conditioner" and is used in many ordinary households. Also installed and used.

The refrigeration cycle of this air conditioner is basically the same as the refrigeration cycle of an embodiment of the present invention described later. explain. As shown in FIG. 1, this refrigeration cycle includes a compressor 101, a four-way valve 1
02, the outdoor heat exchanger 103, the expansion device 104, the first indoor heat exchanger 105a, and the second indoor heat exchanger 105b are connected in this order and in a circulating manner.
The dehumidifying expansion device 106 is interposed between the first indoor heat exchanger 105a and the second indoor heat exchanger 105b. Reference numeral 107 denotes an outdoor fan, and 108 denotes an indoor fan.

In the above-described refrigerating cycle, when performing a cooling dehumidification (dry mode) operation, the dehumidifying expansion device 106 performs a throttling action. In order to perform such an operation, a normally-open one-way solenoid valve 010 as shown in FIG. 9 is used.

That is, the normally-open one-way solenoid valve 010 is
Electromagnetic coil 01, electromagnetic guide 02, plunger-03,
Valve stem 05, spring 06, suction element 07, valve body 08, valve seat 0
The valve body 08 is provided with two valve chambers 08a and 08b separated by a valve seat 09. Valve room 0
A refrigerant inflow pipe 011 is connected to 8a, and a refrigerant outflow pipe 012 is connected to the valve chamber 08b. (here,
The term "inflow" or "outflow" is based on the flow of the refrigerant during operation in the cooling mode of the refrigeration cycle, and the refrigerant pipe connected to the valve chamber 08a is referred to as "refrigerant inflow pipe". The refrigerant pipe connected to 08b is referred to as a “refrigerant outflow pipe”. )

The valve body 08 is integrally provided with a cylindrical portion 014, and an electromagnetic guide 02 is provided inside the cylindrical portion 014 on the upper side in the drawing.
However, similarly, suction elements 07 are provided at the lower portion, respectively, and a plunger 03 integrated with the valve rod 05 is provided therebetween. The plunger 03 is formed in a tubular shape, and the tubular plunger 03 is arranged between the projecting portion of the electromagnetic guide 02 and the tubular portion 014.

A stop ring 013 is provided at a portion of the plunger 03 facing the distal end of the electromagnetic guide 02, and a portion of the electromagnetic guide 02 where the stop ring 013 is provided serves as a stopper for the plunger 03. The plunger 03 is moved upward, that is, the electromagnetic guide 02 by a spring 06 fixed to the suction element 07.
(Valve opening direction). Furthermore, the cylindrical part 0
An electromagnetic coil 01 is provided on the outer surface side of 14.
A bleed groove is formed in the valve seat 09 (the detailed structure is the same as the “bleed groove 31” described later), and when the dehumidifying expansion device 106 is closed, the refrigerant flows through the bleed groove, whereby the refrigerant flows through the bleed groove. An aperture action is provided. Code 01
Reference numeral 5 denotes an outer box, and 016 denotes a coil (outer box) set screw.

Since the dehumidifying expansion device 106 is constituted by the one-way solenoid valve as described above, the above operation is performed only in the cooling operation, and in the heating operation in which the refrigerant flows in the opposite direction, the operation of the dehumidifying expansion device 106 is performed. No throttling action is performed.
That is, during the heating operation, the dehumidifying expansion device 106 is in the open state and the refrigerant expansion operation is not performed.

In order to solve such a disadvantage, a two-way solenoid valve as disclosed in Japanese Patent Application Laid-Open No. HEI 6-101780 has been proposed. This will be described with reference to FIG. 10. The two-way solenoid valve 030 is a pilot-type solenoid valve, and in FIG.
A main valve seat 031b is provided at the bottom of a cylindrical valve chamber 031a communicating with the first fluid passage 032a in the valve body 031. The second fluid passage 032b is opened here. The valve chamber 031a has a main valve chamber 031d in which a piston-shaped main valve body 033 is slidably fitted and a larger-diameter back pressure chamber 031.
c. The diameter of the back pressure chamber 031c is 0 for the main valve chamber.
It is larger than the diameter of 31d.
e is formed, and the diameter of the main valve seat 031b is smaller than the diameter of the main valve chamber 031d. Therefore, when the main valve body 033 is seated on the main valve seat 031b, the pressure in the back pressure chamber 031c is the main pressure. The pressure is applied to the upper surface of the valve body 033, and the pressure in the main valve chamber 031d is applied to a part of the bottom surface of the main valve body 033.

A first leak passage 033b communicating the main valve chamber 031d and the back pressure chamber 031c, and a second leak passage 033d communicating the second fluid passage 032b and the back pressure chamber 031c are formed by the main valve body 033. And the first check valve 033a and the second check valve 033c held by the valve support 035 provided at the tip of the plunger 034 operated by the electromagnetic coil 037 cause the first leak. Channel 033
b, each of the second leak passages 033d is pressed against an opening on the back pressure chamber 031c side by a valve spring.

First check valve 033a, second check valve 033c
When the plunger 034 is attracted to the electromagnetic coil 037, the first check valve 033a and the second check valve 03 are engaged by the engagement of the locking steps 033e and 033f, respectively.
3c is pulled up at the same time, so that the first leak passage 033b and the second fluid passage 032b are opened.
The throttle valve 033g is provided in the second fluid passage 032b, and restricts the flow rate from the second fluid passage 032b to the back pressure chamber 031c, but does not restrict the flow rate in the reverse direction. Reference numeral 038 designates the main valve body 033 as the main valve seat 031b.
Reference numeral 039 denotes a plunger spring that urges the valve body support 035 toward the main valve body 033.

When the electromagnetic coil 037 is in a non-energized state, the engagement between the valve body support 035 and the locking steps 033e and 033f is released, and the first check valve 033a and the second check valve are provided. No. 033c is in the normal closed state. When the electromagnetic coil 037 is energized, the valve body support 035 engages with the locking steps 033e and 033f, and pulls up the first check valve 033a and the second check valve 033c. As a result, the first check valve 033a and the second check valve 033c are both in the open state, and the main valve body 033 is maintained in the fully open state by the urging force of the main valve spring 038.

[0013]

The two-way solenoid valve shown in FIG. 10 functions as a throttle valve in both the forward and reverse directions of the refrigerant, so that it operates not only in the cooling operation but also in the heating operation in which the refrigerant flows in the reverse direction. Although it can be used as a dehumidifier,
The pilot valve type has a problem that the structure is complicated and disadvantageous in cost or maintenance.

The present invention solves such a problem, and has a two-way (throttle) solenoid valve capable of performing cooling and heating, and also performing cooling and heating drying with a simple configuration,
An air conditioner using a two-way solenoid valve is provided.

[0015]

SUMMARY OF THE INVENTION The present invention relates to a normally-open solenoid valve having a valve body, an electromagnetic coil, and a plunger for driving the valve body in a valve closing direction by the magnetic force of the electromagnetic coil. , Two valve parts are formed, and each valve part is opposed to one valve chamber formed in the valve body, two valve seats dividing the valve chamber inside and outside, and both valve seats. And the valve chambers disposed in such a manner that the valve chambers on both sides communicate with each other in the valve body, and refrigerant pipes are respectively connected to the valve chambers on the outside, and the valve bodies are closed. At the time of valve opening, the two-way solenoid valve is configured to be movable in the valve opening direction by a slight stroke by the refrigerant pressure of the refrigerant pipe, and this is a means for solving the problem.

Further, the present invention is a means for solving the problem by constituting a bidirectional solenoid valve in which a throttle means for ensuring a bleed flow rate when the valve is closed is provided in the valve body.

In the air conditioner using a refrigeration cycle, the indoor heat exchanger constituting the refrigeration cycle may be a first indoor heat exchanger located upstream of a refrigerant flow during a cooling operation of the refrigeration cycle. And a second indoor heat exchanger located downstream of the first indoor heat exchanger.
A dehumidifying expansion device is provided between the indoor heat exchanger and the second indoor heat exchanger, and the dehumidifying expansion device is constituted by a two-way solenoid valve to provide a means for solving the problem.

In the two-way solenoid valve of the present invention, when both valve bodies are closed, one of the valve bodies can move in the valve opening direction by a small stroke by the refrigerant pressure, and the other valve body can be moved by the refrigerant pressure. Acting in the valve closing direction, the valve closing state is stably maintained even if the flow direction of the fluid is reversed.

Further, in the two-way solenoid valve of the present invention, when the two valve bodies are closed, the refrigerant moves by a small stroke in the valve opening direction by the refrigerant pressure acting below each of the valve bodies, and the flow of the refrigerant flows. As well as having a function to enable the refrigerant throttle function by a bleed groove formed in the valve seat,
In each operation mode of the cooling dehumidification mode and the heating dehumidification mode in which the valve section is closed, one valve section allows the circulation of the refrigerant and the other valve section can throttle the refrigerant, and the refrigeration cycle is cooled and dehumidified. It works effectively as a throttle device when operating in the heating mode and the heating and dehumidifying mode.

Further, according to the present invention, the refrigeration cycle can be set in a cooling mode, a heating mode, or a combination of a switching operation of the four-way valve of the refrigeration cycle and an energization control of a bidirectional solenoid valve constituting the dehumidifying expansion device. It is possible to switch to four operation modes of a cooling dehumidification mode and a heating dehumidification mode. As a result, the dehumidification operation can be performed at any time of the year, and the comfort time of the air conditioner increases. Further, the two-way solenoid valve constituting the dehumidifying expansion device has a simple structure as compared with the conventional one, and thus is advantageous in terms of manufacturing cost and maintenance. Furthermore, since the dehumidifying expansion device can be made more compact than when two normally-open one-way solenoid valves are arranged side by side, it can be applied to a place where there is only a small space.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a schematic test system diagram of the refrigeration cycle, FIG. 2 is a sectional side view of the bidirectional solenoid valve when not energized, FIG. 3 is a sectional side view when the energization is performed, and FIG. FIG. 5 is a plan view of the valve seat, FIG. 6 is a table showing the state of energization (opening / closing) of the bidirectional solenoid valve in each operation mode, and FIGS. (D) is a diagram showing the open / closed state of both valve portions of the bidirectional solenoid valve and the flow direction of the refrigerant in each operation mode.

As shown in FIGS. 2 and 3, the two-way solenoid valve 10 of this embodiment includes a valve body 14, an electromagnetic coil 18 attached to the valve body 14,
And a plunger 3 which is depressed when the power is supplied to the valve.
b. The two valve bodies 12a and 12b (the valve body 1
2) and valve seats 22a, 2
2b (sometimes abbreviated as valve seat 22)
Two valve portions 30A and 30B are configured. In other respects, the configuration of the valve body 14, the electromagnetic coil 18, and the plunger 3 is the same as that of the conventional electromagnetic valve shown in FIG.

The bidirectional solenoid valve 10 of this embodiment comprises an electromagnetic coil 18, an electromagnetic guide 1, a plunger 3, a stop ring 4, a spring 8, a lid 6, a valve body 14, and two valve seats 22.
a, 22b, and the valve body 14 has a valve seat 22
a, 22b and three valve chambers 23, 23a, 23
b is formed. One refrigerant pipe 28 is connected to the outer valve chamber 23a, and the other refrigerant pipe 29 is connected to the outer valve chamber 23b.
Is connected.

A connecting member 7 is attached to a lower portion of the plunger 3, and a supporting disk 9 is attached to a lower portion of the connecting member 7. Further, a connection fitting 11 is attached to the support disk 9, and the two valve bodies 12 a and 12 b are slidably supported by the connection fitting 11 so that the two valve seats 22 a and
22b are arranged so as to face each other. The upper ends of the valve bodies 12a and 12b are fixed to connecting members 19a and 19b (sometimes abbreviated as connecting members 19) having a U-shaped cross section, and both connecting members 19a and 19b are further fixed.
Are valve springs 8a and 8b (sometimes abbreviated as valve spring 8) having a weak spring force, each having two valve bodies 12a and 12b.
Is pressed against both valve seats 22a and 22b. A slight gap S (for example, 1 mm) is formed between each upper end portion of the coupling tools 19a, 19b and the lower surface of the support disk 9, and is provided from the refrigerant pipes 28, 29 when the valve is closed to the valve body 12a or 1b.
When a high-pressure refrigerant pressure acts on the lower side of 2b, the valve body 12a or 12b moves upward by the gap S to be in a valve-open state.

The connection fitting 11 is guided by two guide pins 13 erected on the valve body 14 while being guided by the valve body 14.
It can be moved up and down along the inner surface of the. Furthermore,
A lid 6 is attached to the upper opening of the valve body 14, and the plunger 3 is provided between the lid 6 and the plunger 3.
That is, the spring 5 that constantly urges the valve element 12 upward (in the valve opening direction).
Is provided. Therefore, when the electromagnetic coil 18 is not energized, the valve body 12 is maintained in the valve open state by the spring force of the spring 5.

The tubular portion 2 is attached to the lid 6, and the electromagnetic guide 1 is attached to the inside of the tubular portion 2 in the upper part of the drawing. The plunger 3 integrated with the connecting member 7 is disposed between the electromagnetic guide 1 and the lid 6 so as to be vertically movable. The plunger 3 is formed in a tubular shape, and the tubular plunger 3 is arranged between the projecting portion of the electromagnetic guide 1 and the tubular portion 2.

A stop ring 4 is provided at a portion of the plunger 3 facing the tip of the electromagnetic guide 1.
It is formed as a stopper. Further, an electromagnetic coil 18 is provided on the outer surface side of the tubular portion 2.

As shown in FIG. 5, a plurality of (four at regular intervals in this embodiment) bleed grooves 31 are provided at the end of the valve seat 22 on the valve opening side. Each bleed groove 31 is formed in such a shape that its width is wide at the inner diameter end and extremely narrow at the outer diameter end, so that when the valve is closed, the refrigerant can flow through the bleed groove 31 while being throttled by the bleed groove 31. ing. The shape, number and arrangement of the bleed grooves 31 are related to the refrigerant passing sound generated in the dehumidifying expansion device 106, and therefore, the optimum one is selected according to the setting state of the refrigeration cycle.

In the above configuration, when the electromagnetic coil 18 is energized, the electromagnetic force generated between the electromagnetic guide 1 and the plunger 3 causes the plunger 3 to move against the urging force of the spring 5.
That is, the valve body 12 is pushed down, and the tip of the valve body 12 is
Contact 2 At this time, due to the tapered surface (see FIG. 2) of the distal end of the valve portion 30, a part of this distal end enters the valve port 33 (see FIG. 4), and the tapered surface is pressed against the inner diameter corner of the valve seat 22. Will be done.

As a result, the valve port 33 is closed and the valve chamber 2 is closed.
3, and the communication between the valve chamber 23a and the valve chamber 23b is interrupted. However, even if the valve port 33 is closed,
A slight gap is formed between the plurality of bleed grooves 31 provided in the valve seat 22 and the tapered surface at the distal end of the valve body 12, and this serves as a refrigerant throttle passage, and the valve chamber 23, the valve chamber 23 a, and the valve chamber 23 b are formed. Communicate with the throttle through the throttle passage.

When the energization of the electromagnetic coil 18 is stopped, the electromagnetic force is extinguished, so that the valve body 12 is lifted by the restoring force of the spring 5, and the valve body 12 is separated from the valve seat 22. As a result, the valve port 33 opens, and the valve chamber 23 and the valve chamber 23
a and the valve chamber 23b communicate completely.

In the air conditioner of this embodiment, the bidirectional solenoid valve 10 having the above configuration is used as the dehumidifying expansion device 106. The flow direction of the refrigerant in each operation mode of cooling, heating, cooling dehumidification, and heating dehumidification in this air conditioner is as shown in FIG. The energization of the electromagnetic coil 18 in each operation mode is as shown in the table of FIG. That is, in the air conditioner of this embodiment, (a) cooling operation, (b) cooling / dehumidification operation, and (c) shown in the table of FIG.
Heating operation and (d) heating / dehumidification operation in four modes can be performed. The selection of each operation mode is performed by operating the four-way valve 102 and energizing the bidirectional solenoid valve 10 on-o.
ff switching can be performed. In this case, the relationship between each operation mode and the energization of the bidirectional solenoid valve 10 is as shown in the table of FIG. 6. In FIG. 6, “×” indicates a non-energized state, and “○” indicates an energized state. Is shown.

That is, in the cooling and heating operation modes,
There is no energization of the electromagnetic coil 18 and therefore the valve element 12
a and 12b are in a state of being lifted upward, and both valve portions 30A and 30B are both in an open state. That is, in the case of the cooling operation mode, both the valve units 30A and 30B are in the state of FIG. Arrow A indicates the flow direction of the refrigerant in the cooling operation mode. Further, in the case of the heating operation mode, both the valve units 30A and 30B are in the state of FIG. 7B. Arrow B indicates the flow direction of the refrigerant in the heating operation mode.

In the cooling and dehumidifying operation mode, the electromagnetic coil 1
8 is energized. As a result, the valve bodies 12a and 12b are pushed down, and both the valve parts 30A and 30B are in the valve closed state. However, the valve portion 30A is lifted upward by the gap S against the spring force of the valve spring 8a by the high-pressure refrigerant pressure acting from below, and the valve portion 30A is opened. On the other hand, the valve portion 30B is in the valve closed state, but is in the throttle communicating state by the throttle function of the bleed groove 31 formed in the valve seat 22b. Therefore, in this cooling operation mode, both valve portions 30A and 30B are in the state shown in FIG. 7C, the refrigerant flows in the direction shown by arrow C, and the cooling and dehumidification operation mode is enabled. 1 indicates the flow direction of the refrigerant in this operation mode.

In the operation mode of heating and dehumidification, as described above,
The electromagnetic coil 18 is energized. As a result, the valve element 12
a and 12b are pushed down, and both valve parts 30A and 30B are both in the valve closed state. However, the valve portion 12B is moved by the high pressure of the refrigerant acting from below so that the valve body 12b
The valve portion 30B is lifted upward by the gap S against the spring force of b, and the valve portion 30B is opened. On the other hand, although the valve portion 30A is in the valve closed state, the bleed groove 31 formed in the valve seat 22a is formed.
With the aperture function, the aperture communication state is established. Therefore,
In this heating operation mode, both valve portions 30A and 30B
In the state (d), the refrigerant flows in the direction shown by the arrow D, and the heating and dehumidifying operation mode is enabled. The two-dot chain line in FIG. 1 indicates the flow direction of the refrigerant in this operation mode.

In FIGS. 2 and 3, reference numeral 17 denotes an outer case provided on the outer peripheral portion of the electromagnetic coil 18, and reference numeral 16 denotes a coil (outer case) set screw.

As described above, in the apparatus of this embodiment, as the dehumidifying expansion device of the refrigeration cycle, the two valve elements are opened by a small stroke by the refrigerant pressure acting below each valve element when the valves are closed. The bleed groove formed in the valve seat has a function of allowing the refrigerant to flow in the direction and allowing the refrigerant to flow, and a bidirectional solenoid valve also having a refrigerant throttle function is used. In each operation mode of the cooling dehumidification mode and the heating dehumidification mode, one of the valve portions allows the circulation of the refrigerant and the other valve portion can throttle the refrigerant. As a result, in addition to the cooling operation and the heating operation, dehumidification during the cooling operation (cooling dehumidification) and dehumidification during the heating operation (heating dehumidification) can be performed.

As shown in FIG. 8, a two-way solenoid valve 10 in which the bleed groove formed in the valve seat 22 is omitted, as shown in FIG. May be connected in parallel.

[0039]

As described above, according to the present invention, the following effects can be obtained. (1) In the two-way solenoid valve of the present invention, when both valve bodies are closed, one of the valve bodies can move in the valve opening direction by a slight stroke with the refrigerant pressure, and the other valve body can move with the refrigerant pressure. Acting in the valve closing direction, the valve closing state can be stably maintained even when the flow direction of the fluid is reversed. (2) The two-way solenoid valve, when the two valve bodies are closed,
In addition to having a function of allowing the refrigerant to flow by moving in a slight stroke in the valve opening direction with a refrigerant pressure acting below each valve element, and also having a refrigerant throttle function by a bleed groove formed in a valve seat. Therefore, in each of the cooling dehumidification mode and the heating dehumidification mode in which the valve unit is closed, one of the valve units allows the flow of the refrigerant, and the other valve unit can perform the throttle of the refrigerant. When the cycle is operated in the cooling dehumidification mode and the heating dehumidification mode, it effectively functions as a throttle device. (3) The refrigeration cycle can be switched between a cooling mode, a heating mode, a cooling dehumidification mode, and a heating dehumidification mode by a combination of a switching operation of the four-way valve of the refrigeration cycle and an energization control to a two-way solenoid valve constituting the dehumidification expansion device. It is possible to switch to four operation modes. As a result, the dehumidification operation can be performed at any time of the year, and the comfort time of the air conditioner increases. (4) Since the structure of the two-way solenoid valve constituting the dehumidifying expansion device is simpler than that of the conventional one, it is advantageous in terms of manufacturing cost and maintenance. Furthermore, since the dehumidifying expansion device can be made more compact than when two normally-open one-way solenoid valves are arranged side by side, it can be applied to a place where there is only a small space.

[Brief description of the drawings]

FIG. 1 is a schematic test system diagram of a refrigeration cycle using a two-way solenoid valve according to one embodiment of the present invention.

FIG. 2 is a side sectional view of the two-way solenoid valve when the valve is opened.

FIG. 3 is a side sectional view when the valve is closed.

FIG. 4 is an enlarged side sectional view of a main part of the two-way solenoid valve.

FIG. 5 is a plan view of a valve seat of the bidirectional solenoid valve.

FIG. 6 is a table showing a state of energization (opening / closing) of the bidirectional solenoid valve in each of the operation modes.

FIGS. 7A to 7D are diagrams showing the open / closed state of the bidirectional solenoid valve and the flow direction of the refrigerant in each operation mode.

FIG. 8 is a schematic test system diagram of another refrigeration cycle using the bidirectional solenoid valve according to one embodiment of the present invention.

FIG. 9 is a side sectional view of a solenoid valve as a conventional throttle device.

FIG. 10 is a side sectional view of another solenoid valve as a conventional throttle device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnetic guide 2 Cylindrical part 3 Plunger 4 Stop ring 5 Spring 6 Lid 7 Connection member 8 Valve spring 9 Support disk 10 Bidirectional electromagnetic valve 11 Connection fitting 12 Valve body 13 Guide pin 14 Valve body 22 Valve seat 23 Inside Valve chambers 23a, 23b Outer valve chambers 28, 29 Refrigerant pipes 30A, 30B Valve section 31 Bleed groove 101 Compressor 102 Four-way valve 103 Outdoor outdoor heat exchanger 104 Throttling device 105a First indoor heat exchanger, 105b Second chamber Heat exchanger 106 Dehumidification expansion device

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[Procedure amendment]

[Submission date] October 11, 2001 (2001.10.
11)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 5

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claim 6

[Correction method] Change

[Correction contents]

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0023

[Correction method] Change

[Correction contents]

The bidirectional solenoid valve 10 of this embodiment includes an electromagnetic coil 18, an electromagnetic guide 1, a plunger 3, a stop ring 4, a spring 5, a lid 6, a valve body 14, and two valve seats 2.
2a and 22b, and the valve body 14 has a valve seat 22
a, 22b and three valve chambers 23, 23a, 23
b is formed. One refrigerant pipe 28 is connected to the outer valve chamber 23a, and the other refrigerant pipe 29 is connected to the outer valve chamber 23b.
Is connected.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0032

[Correction method] Change

[Correction contents]

In the air conditioner of this embodiment, the bidirectional solenoid valve 10 having the above configuration is used as the dehumidifying expansion device 106. The flow direction of the refrigerant in each operation mode of cooling, heating, cooling dehumidification, and heating dehumidification in this air conditioner is as shown in FIG. The energization of the electromagnetic coil 18 in each operation mode is as shown in the table of FIG. That is, in the air conditioner of this embodiment, four modes of operation shown in the table of FIG. 6 are performed: (a) cooling operation, (b) heating operation, (c) cooling / dehumidification operation, and (d) heating / dehumidification operation. be able to. The selection of each operation mode depends on the operation of the four-way valve 102 and the on-
This can be performed by switching off. In this case, the relationship between each operation mode and energization of the bidirectional solenoid valve 10 is as follows.
As shown in the table of FIG. 6, in FIG. 6, "x" indicates a non-energized state, and "o" indicates an energized state.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Change

[Correction contents]

In FIGS. 2 and 3, reference numeral 17 denotes an outer case provided on the outer peripheral portion of the electromagnetic coil 18, and reference numeral 16 denotes a coil (outer case) set screw.

[Procedure amendment 6]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction contents]

FIG. 2

Claims (6)

[Claims] 1. A normally-open solenoid valve, comprising: a valve body, an electromagnetic coil, and a plunger for driving a valve body in a valve closing direction by a magnetic force of the electromagnetic coil, wherein the valve body has two insides. A valve portion is formed, and each valve portion is disposed so as to face one valve chamber formed in the valve body, two valve seats partitioning the valve chamber inside and outside, and the valve seat. The valve chambers on both sides are connected to each other in the valve body, and refrigerant pipes are connected to the valve chambers on the outside, respectively. A bidirectional solenoid valve configured to be movable in the valve opening direction by a slight stroke by the refrigerant pressure of the refrigerant pipe. 2. A connecting fitting is provided in the valve body so as to be vertically movable along an inner surface of the valve body, and the connecting fitting is connected to the plunger;
The two valve bodies are supported by the connection fitting so as to be movable in the vertical direction, and valve springs having a weak spring force for pressing both front valve bodies against the valve seats are attached to the respective valve bodies. Item 2. The two-way solenoid valve according to Item 1. 3. The two-way solenoid valve according to claim 1, wherein a throttle means for ensuring a bleed flow when the valve is closed is provided in the valve body. 4. A two-way solenoid valve according to claim 3, wherein said throttle means is constituted by a bleed groove formed in said valve seat. 5. An air conditioner using a refrigeration cycle, wherein the refrigeration cycle is configured by circulating a compressor, a four-way valve, an outdoor heat exchanger, a refrigerant expansion device, and an indoor heat exchanger. And the indoor heat exchanger is divided into a first indoor heat exchanger located upstream of the refrigerant flow during the cooling operation of the refrigeration cycle and a second indoor heat exchanger located downstream of the first indoor heat exchanger. A dehumidifying throttle device is provided between the first indoor heat exchanger and the second indoor heat exchanger, and the dehumidifying throttle device is constituted by the two-way solenoid valve according to claim 3 or 4. An air conditioner characterized by that: 6. The refrigeration cycle is switched between a cooling mode, a heating mode, a cooling dehumidification mode, and a heating dehumidification mode by combining a switching operation of a four-way valve of the refrigeration cycle with an energization control operation of the two-way solenoid valve. The air conditioner according to any one of claims 1 to 5, wherein the air conditioner can be switched to four operation modes.