JP2002013843A - Four-way change-over valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a four-way change-over valve which can enhance the easiness and quickness of the action of changing over a refrigerant passage, and also can enhance the reliability on itself, and further is possible of simplification of its constitution, and can attain the reduction of the manufacture cost. SOLUTION: This is a four-way change-over valve which is equipped with a motor part consisting of a stator and a rotor, and a main body part consisting of a case, a main valve arranged in the valve chamber within the case, and a valve seat, and the above valve seat is equipped with a suction pressure orifice and a discharge pressure orifice leading to the suction pressure side and the discharge pressure side, respectively, of a compressor, and two orifices leading to indoor and outdoor several heat exchangers, respectively, and the above main valve is equipped with connection parts selectively leading to the above suction pressure orifice and the above two orifices, and a pressure equalizing port for connecting those connection parts with the above valve chamber, and also a rotary sleeve constituting the above rotor is equipped with a sub valve for allowing the shifting of pressure by opening and closing the above pressure equaling port, and a working pin for shifting the position of the above main valve, and the above sub valve is rotated on the above main valve by the rotation of the above rotor of the above motor part, and also the above main valve is slid on the above valve seat through the above working pin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a four-way switching valve, and more particularly to a four-way switching valve having a main valve having a discharge pressure relief valve as a sub-valve.

[0002]

2. Description of the Related Art In general, an air conditioner used in a room air conditioner or the like can change a flowing direction of a refrigerant so that a cooling operation or a heating operation can be performed according to the season. This is performed by a switching valve.
FIG. 8 shows an example of a cooling and heating cycle of an air conditioner using the switching valve. In this cycle, the compressor C, the switching valve SV, the heat exchanger E, and the electronic linear control valve T are connected, and the refrigerant during the cooling operation is switched to the compressor C as shown by the solid line arrow. The valve SV, the outdoor heat exchanger E1, the electronic linear control valve T, and the indoor heat exchanger E2 flow in this order, return to the compressor C via the switching valve SV, and circulate again. on the other hand,
The refrigerant during the heating operation flows in the order of the compressor C, the switching valve SV, the indoor heat exchanger E2, the electronic linear control valve T, and the outdoor heat exchanger E1, as indicated by the one-dot chain line arrow, and passes through the switching valve SV. It returns to the compressor C again and circulates.

Here, as an example of the switching valve, a four-way switching valve technology has been proposed (see, for example, Japanese Utility Model Registration No. 2523031). The proposed technique comprises an electromagnet disposed at an upper portion of a valve body, a valve seat attached to a lower end of the valve body, and a valve body rotatably disposed within the valve body. The valve seat has a discharge pressure passage hole for introducing a discharge pressure of the compressor and a suction pressure passage hole for introducing a suction pressure, and a conduction hole for an outdoor heat exchanger and a conduction hole for an indoor heat exchanger which are communicated with a heat exchanger. Are provided at required angular intervals, the valve body is formed of a plastic magnet, and a guide hole capable of alternately communicating with the discharge pressure conducting hole and any one of the two conducting holes is formed, and A connection groove capable of alternately communicating with the suction pressure conducting hole and any one of the two conducting holes is formed, and the discharge pressure conducting hole is provided with an introduction pipe having a tip protruding from an end of the guide hole. The protrusion of the introduction tube is Is obtained by a stopper for limiting rotation of the valve body is brought into contact with the end portion of the wellbore.

As another example of the same four-way switching valve as described above, a discharge pressure passage hole and a suction pressure passage hole, a passage hole for an outdoor exchanger and a passage hole for an indoor exchanger are provided in a valve seat. A slidable main valve for switching a hole, a valve chamber which covers the entirety of the through hole by the main valve to define a valve body, an auxiliary valve for opening and closing the suction pressure conductive hole by electromagnetic force, and There has been proposed a technology of a four-way switching valve including a valve and a spring connecting the main valve, wherein the diameter of the discharge pressure communication hole is smaller than the diameter of the suction pressure communication hole (for example, Japanese Patent Application Publication No. HEI-HEI-1). -32389).

[0005]

Among the above-mentioned conventional techniques, the technique of the four-way switching valve described in Japanese Utility Model Registration No. 2523031 is characterized in that the discharge pressure passage hole, the passage hole, Although the switching of the refrigerant flow path between the suction pressure passage and the passage is performed inside and outside the main valve, the low suction pressure is generated inside the main valve, Since the high discharge pressure is generated on the outside, the switching operation tends to be heavy because there is a pressure difference across the main valve, and the four-way switching valve is easy to switch the refrigerant flow path. Agility is not specifically considered. Also,
Among the above conventional techniques, the technique of the four-way switching valve described in Japanese Patent Publication No. 1-33893 is one in which the operation of switching the refrigerant passage by the main valve is performed after eliminating the pressure difference of the valve body. Since the main valve is rotated by the expansion and contraction of the elastic member, no special consideration is given to the agility of the switching operation of the refrigerant flow path and the reliability of the four-way switching valve.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to improve the easiness and agility of the switching operation of the refrigerant flow path and improve the reliability of the switching valve. An object of the present invention is to provide a four-way switching valve capable of improving the configuration and further simplifying the configuration of the switching valve and achieving a reduction in product cost.

[0007]

In order to achieve the above object,
The four-way switching valve according to the present invention basically includes a motor unit including a stator and a rotor, a case, a main unit including a main valve and a valve seat arranged in a valve chamber in the case, and The valve seat includes a suction pressure introduction hole and a discharge pressure conduction hole that respectively communicate with the suction pressure side and the discharge pressure side of the compressor, and two conduction holes that communicate with the indoor and outdoor heat exchangers, respectively. The main valve includes a communication portion selectively communicating with the suction pressure communication hole and the two communication holes, and a pressure equalizing hole communicating the communication portion and the valve chamber, and configures the rotor. The rotor sleeve includes a sub-valve for opening and closing the pressure equalizing hole to move the pressure, and an operating pin for moving a position of the main valve. The rotation of the rotor of the motor unit causes the sub-valve to move to the main valve. Pivot on the valve and through the actuation pin It is characterized by sliding the serial main valve on the valve seat.

In the four-way switching valve of the present invention having the above-described structure, a sub-valve for moving pressure inside and outside the main valve is provided on the main valve, and the sub-valve is moved above the main valve by rotation of a rotor. To open and close the pressure equalizing hole to move the pressure between the communicating portion and the valve chamber, and to reduce the number of operating parts because the main valve slides on the valve seat of the valve chamber. The structure of the switching valve can be simplified, the reliability of the switching valve can be improved, and the operation of switching the refrigerant flow path by the main valve can be performed easily and quickly.

In a specific aspect of the four-way switching valve of the present invention, the sub-valve is a relief valve, which is located between the rotor and the main valve and is fixed to the rotor sleeve. The rotor sleeve is slidably mounted on the main valve, or the rotor sleeve has a support shaft concentric with the center of rotation of the main valve on upper and lower portions thereof, and the operating pin is mounted on the rotor sleeve. It is fixed and rotates integrally with the rotor to rotate the main valve.

Further, in another specific aspect of the four-way switching valve of the present invention, an elastic member is provided on a support shaft at an upper and lower part of the rotor sleeve, and the auxiliary valve and the main valve are connected by the elastic member. A stopper that is biased in the valve seat direction, or the valve seat includes a main valve stopper that regulates a rotation range of the main valve, and the main valve is in contact with the main valve stopper. It is characterized by having an abutting portion, and it is possible to reliably control the switching position of the refrigerant flow path by the main valve, and to manufacture the main valve by using the same material for the stopper abutting portion and the main valve. Cost can be reduced.
Further, still another specific embodiment of the four-way switching valve of the present invention includes:
One of the main valve stopper and the stopper contact portion is made of a magnet, and the other is made of a magnetic material, and the magnetic force of the main valve stopper or the stopper contact portion itself is reduced. Thus, the switching position of the refrigerant flow path can be more reliably held, and the vibration resistance of the four-way switching valve can be further improved.

Further, a specific embodiment of the four-way switching valve of the present invention is characterized in that at least one of the main valve, the sub-valve and the valve seat is subjected to lubricating alumite treatment,
Lubricity can be improved when the main valve or the sub valve slides. As a result, sliding friction is reduced, and stable operation can be realized.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a four-way switching valve of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the four-way switching valve of the present invention. FIG. 1 is a perspective view showing the appearance, FIG. 2 is an exploded perspective view, FIG. 4 are cross-sectional views of FIG. The four-way switching valve 100 according to the illustrated embodiment includes a motor unit 10 including a stepping motor and a main body 50 including a main valve 70. The four-way switching valve 100 according to the present embodiment includes a main valve 70,
When the stepping motor is energized, it rotates on the valve seat 80 to switch the refrigerant flow path. The motor unit 10
Is composed of a stator 20 and a rotor 40, and the stator 20 is provided with a stator coil 21 stored vertically.
And a yoke 22. The stator coil 21 is connected to a cable 23 in which lead wires are bundled and a connector 24 provided on the outer periphery of the stator 20.

A mounting table 25 having a predetermined height is projected from an upper surface of the stator 20, and a pressing and locking member 26 made of sheet metal is fixed to the mounting table 25 with a screw 27. A relatively thin spherical crown-shaped locking projection 26a protruding from the stopper 26
Are four engagement recesses 3 provided at predetermined angular intervals (90 degrees) on the outer peripheral side surface of a small-diameter cylindrical portion 31 of a case 30 described later.
2 to prevent rotation of the stator 20 with respect to the small-diameter cylindrical portion 31 and to prevent the stator 20 from coming off. The engaging recess 32 is a relatively shallow spherical crown-shaped recess fitted on the same plane as the locking projection 26a. The rotor 40 includes a rotor sleeve 41, an upper support shaft 42 inserted at the center of the upper surface of the rotor sleeve 41, and a lower support shaft 43 inserted at the center of the lower surface of the rotor sleeve 41. , The rotor sleeve 41
Is provided with a magnet 48 on the outer periphery.

The upper end of the upper support shaft 42 is in point contact with the apex of the spherical inner surface of the small-diameter cylindrical portion 31, and the upper support shaft 42 is in contact with the upper support shaft 42. An upper surface side pressing spring 44 is provided as an elastic member for urging the rotor sleeve 41 and a sub-valve 61 as a relief valve described later toward the main valve 70 via a spring receiver 45 or the like integrated with the shaft 42. On the other hand, the lower surface side support shaft 43 is provided with a lower surface side pressing spring 46 as an elastic member for urging the main valve 70 in the direction of the valve seat 80 (urging the rotor sleeve 41 upward). Is provided through. The urging force of the upper surface-side pressing spring 44 is reduced by the lower surface-side pressing spring 46.
The sub-valve 61 is biased in the direction of the main valve 70, and the main valve 70 is
It is urged in the zero direction.

The main body 50 is a case 3 which is a can.
0, a main valve 70, a valve seat 80, and a conduit group 90. The case 30 of the present embodiment includes a small-diameter cylindrical portion 31 having a spherical top, a large-diameter cylindrical portion 33 integrally joined at a lower end of the small-diameter cylindrical portion 31, and The stator 20 is externally fitted to the small-diameter cylindrical portion 31, and the rotor 40 is internally fitted to the small-diameter cylindrical portion 31. A valve seat 80 having a flange portion 89 at the lower portion is fitted in the large-diameter cylindrical portion 33, and the case 30 and the valve seat 80 are integrated with each other by fastening the flange portion 35 and the flange portion 89 with bolts 69. Fixed to. The main valve 70 is housed in the large-diameter cylindrical portion 33 of the case 30 and is slidably mounted on the upper surface of the valve seat 80. Then, an inner portion of the large-diameter cylindrical portion 33 is formed as a valve chamber 73.

On the upper surface of the main valve 70, there is provided a sub-valve 61 and a substantially cylindrical operating pin 64. The sub-valve 61 opens and closes a pressure equalizing hole 77 of the main valve 70, and Communication part 74
The communication between the valve chamber 73 and the valve chamber 73 in the case 30 and the closing thereof are performed to move the pressure. The operating pin 64 rotates integrally with the rotor 40 and slides the main valve 70.
Further, the sub-valve 61 and the operating pin 64 are press-fitted and fixed at positions appropriately separated from a straight line passing through the axis of the lower support shaft 43 of the rotor 40, and energize the stator coil 21 through the cable 23 and the connector 24. By the excitation, the main valve 70 is rotated on the valve seat 80 by the operating pin 64 via the rotor 40, and the flow of the refrigerant described later is switched, and the sub-valve 61 is mainly operated via the rotor 40. The pressure equalizing hole 77 is opened and closed by rotating on the valve 70. The main valve 70 has a substantially sector shape including a central portion 72 engaged with the lower surface side support shaft 43 and an outer peripheral portion 75 extending outward of the central portion 72. An engagement hole 71 to be engaged with the lower support shaft 43 is formed.

On both outer sides of the main valve 70 having a substantially fan shape, pin contact portions 78A, 79A contacting the operating pin 64.
Are provided symmetrically, and are brought into contact with a main valve stopper 86 provided on the valve seat 80.
8a and 79a are provided at the lower ends of the pin contact portions 78A and 79A, respectively. The stopper contact portion 78
a and 79a are such that the main valve 70 is rotated in accordance with the rotation angle per unit pulse of the stepping motor via the operation pin 64, and the main valve 70 comes into contact with the main valve stopper 86 to restrict the movement thereof. It is formed in a control shape such as an optimum control curve or control straight line.

Further, the main valve 70 and the valve seat 80 of this embodiment
In addition to the above configuration, the stopper contact portions 78a, 79
a may be constituted by a magnet such as a ferrite magnet, and the main valve stopper 86 may be constituted by a magnetic material such as iron, for example. In this case, the stopper contact portions 78a and 79a and the main valve stopper 86 The contact state is maintained by magnetic force. Thereby, the switching position of the flow path by the main valve 70 is more reliably held by the magnetic force, and the vibration resistance of the four-way switching valve 100 can be further improved. The strength of the magnetic force is, of course, set appropriately smaller than the rotational power of the motor unit 10. In this case, the stopper contact portions 78a and 79a are connected to the central portion 72 of the main valve 70.
When the outer peripheral portion 75 is made of a resin, the outer peripheral portion 75 may be formed by insert molding, or when the central portion 72 and the outer peripheral portion 75 are made of a metal such as aluminum, they may be bonded with an adhesive. Incidentally, the stopper contact portions 78a and 79a may be made of a magnetic material, and the main valve stopper 86 may be made of a magnet.

On the other hand, the inside of the substantially fan-shaped main valve 70 communicates with one of the suction pressure conducting hole 82 of the valve seat 80 and the conducting hole 84 for the outdoor heat exchanger or the conducting hole 85 for the indoor heat exchanger. A communication portion 74 and a pressure equalizing hole 77 that connects the communication portion 74 to the valve chamber 73 are provided. The sub-valve 61 includes a rotor press-fitting portion 62 and a pressure equalizing hole closing portion 63. The rotor press-fitting portion 62 is press-fitted and fixed to the lower surface side of the rotor 40. 7
The upper and lower surfaces of the valve chamber 73 receive the pressure of the refrigerant in the valve chamber 73 and the pressure of the refrigerant in the communication chamber 74.

The upper surface of the valve seat 80 has a planar shape, and its upper surface is in contact with the lower end surface of the main valve 70, and the bolt hole 87 of the flange 89 at the lower end thereof and the case 30 have the same shape.
The bolt 69 is inserted into the bolt hole 34 of the flange portion 35 and fastened. As shown in FIGS. 4 (a) and 4 (b), the lower surface side support shaft 43 is press-fitted at the center thereof. A suction pressure passage hole 82 for introducing the suction pressure of the compressor and a discharge pressure passage for introducing the discharge pressure are provided at a predetermined position radially away from the center of the lower support shaft 43. A hole 83, a conduction hole 84 for the outdoor heat exchanger, and a conduction hole 85 for the indoor heat exchanger, which are communicated with the indoor and outdoor heat exchangers, are provided.
A substantially cylindrical main valve stopper 86 for regulating the rotation position of the main valve is fixed. The case 30 and the valve seat 80 are fitted and fixed via an O-ring 88, and the valve chamber 73 is fixed.
The inside is sealed.

As shown in FIG. 4, the suction pressure communication hole 82 and the discharge pressure communication hole 83 are provided at symmetrical positions with respect to the lower support shaft 43, The through-hole 84 for the exchanger and the through-hole 85 for the indoor heat exchanger have a predetermined angular position different from the suction pressure through-hole 82 and the discharge pressure through-hole 83 at a symmetric position about the lower support shaft 43. Each is provided. The main valve stopper 86 is located on a straight line connecting the suction pressure passage 82 and the discharge pressure passage 83, and is located at an appropriate position between the lower surface side support shaft 43 and the discharge pressure passage 83. One is provided.
The conduit group 90 is connected to a suction pressure conducting tube 92 connected to the suction pressure conducting hole 82, a discharge pressure conducting tube 93 connected to the discharge pressure conducting hole 83, and a conducting hole 84 for the outdoor heat exchanger. And a conduction pipe 95 for the indoor exchanger connected to the conduction hole 85 for the indoor heat exchanger, and are connected and fixed to the lower end side of the valve seat 80, respectively.

Furthermore, the main valve 70 and the sub-valve 61 of the present embodiment
And the valve seat 80 can also comprise at least one of them by lubricating alumite treatment. The lubricating alumite treatment is performed, for example, by using “Kashima Coat” (trade name:
(Miyaki Co., Ltd.) is used as follows. That is, the main valve 70 is made of aluminum, and molybdenum disulfide is electrolytically deposited on a hard alumina layer formed by performing anodizing treatment on the aluminum. By this lubricating alumite treatment, the main valve 70
Can be improved in lubricity.

Furthermore, not only the main valve 70 but also the equalizing hole closing portion 63 of the sub-valve 61 and the valve seat 80 are made of aluminum, and the lubricating alumite treatment is performed on them, so that the sub-valve 61 and the Lubricity between the valves 70 and between the main valve 70 and the valve seat 80 can be further improved.

The lubricating alumite treatment is as follows.
In addition to the above "Kashima Coat", "Unimite" (trade name: Ueda Alumite Industry Co., Ltd.) or "Tuffmite"
(Product name: Ueda-Alumite Industry Co., Ltd.) can also be used for at least one of the main valve, the auxiliary valve, and the valve seat. The lubricating alumite treatment reduces the sliding friction between the sub-valve and the main valve and between the main valve and the valve seat, thereby stabilizing the operation. In addition, the improved lubricity enables the operation of the four-way switching valve with a low torque, so that the size of the motor can be reduced.

Next, the operation of the four-way switching valve 100 will be described. (A) to (d) of FIG. 5 and (a) of FIG.
FIGS. 5A to 5D are operation explanatory diagrams based on the internal structure for explaining the operation of the four-way switching valve 100. FIGS. 5A to 5D respectively show FIGS. 6A to 6D. Shows the same operating state as each of.

(A) shows a set state during the cooling operation, in which the suction pressure conducting pipe 92 and the indoor heat exchanger conducting pipe 9 are connected.
5 communicates with the main valve 70 via a communication portion 74, and the discharge pressure conducting tube 93 and the outdoor heat exchanger conducting tube 94 communicate with the outside of the main valve 70, that is, the valve chamber 73. In this state, there is a large pressure difference between the pressure in the valve chamber 73 and the pressure in the communication portion 74, and the main valve 70 is pressed against the valve seat 80 by this pressure difference and does not move easily. Therefore, the four-way switching valve 100 of the present embodiment is provided with the auxiliary valve 61 which is a relief valve when switching the refrigerant flow path from this state.
Is used to balance the pressures of the valve chamber 73 and the communication portion 74, and the main valve 70 is rotated after the force for pressing the main valve 70 is removed.

First, in the state (a), the operating pin 64 and the auxiliary valve 61 which are rotated via the rotor 40 by the pulse input to the stepping motor move in the hour hand direction in FIG. 5 ((b) in FIGS. 5 and 6). )), The auxiliary valve 61 is rotated.
The pressure equalizing hole 77 of the main valve 70 closed by the pressure equalizing hole closing portion 63 is released, and the refrigerant in the valve chamber 73 is introduced into the communication portion 74 through the pressure equalizing hole 77, and The pressure and the pressure in the communication portion 74 are balanced.

As shown in (b), the valve chamber 73 and the communicating portion 7
After the pressure is balanced with the pin 4, the pin contact portion 7 of the main valve 70
The main valve 70 is pushed by the operating pin 64 abutting on 9A to rotate and slide on the valve seat 80 in the hour hand direction, so that the stopper abutting portion 79a is separated from the main valve stopper 86 and another stopper abuts. The part 78a is rotated until it comes into contact with the main valve stopper 86 (FIGS. 5 and 6 (c)). By this operation, communication between the suction pressure conducting pipe 92 and the indoor heat exchanger conducting pipe 95 by the main valve 70 is switched to communication between the suction pressure conducting pipe 92 and the outdoor heat exchanger conducting pipe 94, and at the same time, the valve is opened. Discharge pressure conduit 93 via chamber 73 and conduit 94 for outdoor heat exchanger
Is switched to communication between the discharge pressure conducting tube 93 and the conducting tube 95 for the indoor heat exchanger. When the stopper contact portion 78a and the main valve stopper 86 are kept in contact with each other by their own magnetic force, the main valve 70 is securely held at the position.

As shown in (c), the suction pressure conducting pipe 92
After the stepping motor is rotated in the opposite direction after the communication between the and the outdoor heat exchanger conduction pipe 94 in the communication section 74, the operation pin 64 and the sub-valve 61 are moved in the counter-hour hand direction in FIG. 5, (d)), the pressure equalizing hole 77 of the main valve 70 is closed by the pressure equalizing hole closing portion 63 of the sub-valve 61. By this operation, the set state at the time of the heating operation, that is, the suction pressure conducting pipe 92 and the outdoor heat exchanger conducting pipe 94 communicate with each other via the communicating portion 74 of the main valve 70,
The discharge pressure conducting pipe 93 and the indoor heat exchanger conducting pipe 95 communicate with each other via the valve chamber 73. When switching from the state of (d) to the set state in the cooling operation of (a), for example, the closing of the equalizing hole 77 by the equalizing hole closing portion 63 of the sub-valve 61 is released, and the operation is started. The main valve 70 is rotated until the pin 64 contacts the pin contact portion 78A and the stopper contact portion 79a contacts the main valve stopper 86.

As described above, the above embodiment of the present invention
The following functions are provided by the above configuration. That is, the four-way switching valve 100 of the embodiment is configured so that the sub-valve 61
Since the main valve 70 pivots on the valve seat 80 after pivoting upward, it is possible to switch the flow of the refrigerant after balancing the pressure between the valve chamber 73 and the communication portion 74. Therefore, the switching operation of the flow path of the refrigerant can be performed easily and quickly as compared with the case where the main valve is rotated using the elastic member, and further, the reliability of the four-way switching valve 100 can be improved. Can be planned.

The sub-valve 61 is located between the rotor 40 and the main valve 70, is mounted on the main valve 70, and is moved in the direction of the main valve 70 by the upper surface side pressing spring 44. While being urged, it rotates integrally with the rotor 40 and functions as a relief valve that eliminates the pressure difference between the communication portion 74 and the valve chamber 73, so that the switching operation of the refrigerant flow path can be performed quickly. In addition, the number of movable parts can be reduced, and the product cost of the four-way switching valve 100 can be reduced.

Further, the stopper contact portions 78a, 79
When the main valve stopper 86 and the main valve stopper 86 are kept in contact with each other by their own magnetic force, the switching position of the main valve 70 with respect to the valve seat 80 can be reliably held against vibration. Further, the reliability of the four-way switching valve 100 can be further improved. As mentioned above, although one Embodiment of this invention was described in detail, this invention is not limited to the said Embodiment, Moreover, it is not limited to an air conditioner,
It can be used for all devices that switch the flow path.

FIG. 7 is a sectional view showing another embodiment of the present invention. Since the four-way switching valve generally denoted by reference numeral 200 has the same configuration as the above-described four-way switching valve, the same portions are denoted by the same reference numerals and description thereof is omitted. In the four-way switching valve 200, the support shaft 140 that supports the rotor 40 is formed of a single shaft. Support shaft 140
Is fixed by being press-fitted into a press-fitting hole 81 of a valve seat 80, and a rotor sleeve 4 is provided between the support shaft 140 and the rotor sleeve 41.
A bearing 148 is interposed at two places, that is, an upper part and a lower part.

A snap ring 141 is attached to the end of the support shaft 140 opposite to the valve seat 80 side.
42 is attached. The pressing spring 142 urges the rotor 140 toward the valve seat 80 via the spring receiving ring 143. A snap ring 145 is also provided between the rotor sleeve 41 of the support shaft 140 and the main valve 70, and a push spring 146 is provided. The pressing spring 146 urges the main valve 70 toward the valve seat 80 via the spring receiving ring 147.

In the four-way switching valve 200, the number of parts is further reduced, the need for shaft alignment is eliminated when two support shafts are used, and the structure is simplified. Further, the rotation accuracy of the rotor is also improved.

[0036]

As can be understood from the above description, in the four-way switching valve of the present invention, a sub-valve is provided on the upper surface of the main valve, and the sub-valve balances the pressure between the valve chamber and the communicating portion of the main valve. Since the position switching operation of the main valve is performed after the operation is performed, the ease and agility of the switching operation of the refrigerant flow path can be improved, and the product cost of the switching valve can be reduced.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a four-way switching valve according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the four-way switching valve of FIG.

FIG. 3 is a longitudinal sectional view of the four-way switching valve of FIG. 1;

4A is a cross-sectional view of the four-way switching valve of FIG. 3 taken along the line AA, and FIG. 4B is a cross-sectional view of the four-way switching valve of FIG.

5 (a) to 5 (d) are plan views showing the operation of the four-way switching valve of FIG. 1;

6 (a) to 6 (d) are longitudinal sectional views of the operation of the four-way switching valve in FIG.

FIG. 7 is a longitudinal sectional view of a four-way switching valve according to another embodiment of the present invention.

FIG. 8 is a cycle configuration diagram during a cooling / heating operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Motor part 20 Stator 30 Case 41 Rotor sleeve 42 Support shaft 43 Support shaft 44 Elastic member (upper surface pressing spring) 46 Elastic member (lower surface pressing spring) 50 Main body 61 Secondary valve (relief valve) 64 Operating pin 70 Main valve 73 valve chamber 74 communication part 77 equalizing hole 78a stopper contact part 79a stopper contact part 80 valve seat 82 suction pressure conduction hole 83 discharge pressure conduction hole 84 conduction hole 85 conduction hole 86 main valve stopper 100 four-way switching valve

Claims (7)

[Claims] A motor unit comprising a stator and a rotor;
In a four-way switching valve including a case, a main body disposed in a valve chamber in the case, and a main body including a valve seat, the valve seat communicates with a suction pressure side and a discharge pressure side of a compressor, respectively. A suction pressure passage hole, a discharge pressure passage hole, and two conduction holes respectively communicating with the indoor and outdoor heat exchangers, and the main valve is selected from the suction pressure passage hole and the two conduction holes. And a pressure equalizing hole for communicating the communication portion with the valve chamber. The rotor sleeve forming the rotor opens and closes the pressure equalizing hole to move the pressure. A valve and an operation pin for moving the position of the main valve, and by rotating the rotor of the motor unit, the sub-valve is rotated on the main valve, and the main valve is moved through the operation pin. Four-way sliding on the valve seat Valve. 2. The sub-valve, which is a relief valve, is located between the rotor and the main valve, is fixed to the rotor sleeve, and is slidably mounted on the main valve. The four-way switching valve according to claim 1, wherein 3. The rotor sleeve has a support shaft concentric with a rotation center of the main valve at upper and lower portions thereof, and the operating pin is fixed to the rotor sleeve, and rotates integrally with the rotor, The four-way switching valve according to claim 1, wherein the main valve is rotated. 4. The support shaft at the upper and lower portions of the rotor sleeve is provided with an elastic member, and the sub-valve and the main valve are urged in the valve seat direction by the elastic member. The four-way switching valve according to claim 3, wherein 5. The valve seat according to claim 1, further comprising: a main valve stopper for restricting a rotation range of the main valve, wherein the main valve has a stopper contact portion that contacts the main valve stopper. The four-way switching valve according to claim 1. 6. The four-way switching valve according to claim 5, wherein one of the main valve stopper and the stopper contact portion is formed of a magnet, and the other is formed of a magnetic material. 7. The four-way switching valve according to claim 1, wherein at least one of the main valve, the valve seat, and the sub-valve is formed by lubricating anodizing.