JP2001004052A - Solenoid controlled pilot type four-way valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid controlled pilot type four-way valve operable even in a high differential pressure of a refrigerant. SOLUTION: In an initial step of switching the cycle of cooling and heating, by energizing an electromagnetic coil 96, magnetic poles are switched between magnetic pole plate A 98 and a magnetic pole plate B 99 to rotate a permanent magnet 75. Thereby, an auxiliary valve 77 is rotated by an amount optionally set with respect to a valve element so as to open an auxiliary valve seat portion 83. A pressure chamber 85 located above the valve element 72 is set to a lower pressure close to the pressure of a low pressure communicating hole 81. Then, the pressure difference between the pressure chamber 85 having low pressure and the inside surface of the valve element 72 raises the valve element 72. Additionally, pressure of a refrigerant at the high pressure side pressing the valve element 72 to the valve set during operation is relieved to the low pressure side to eliminate pressure difference between the upside and downside of the valve element 72. Then, the rotation of the permanent magnet 75 rotates the valve element 72 and a coil actuates the auxiliary valve and rotates the valve element 72 to switch the air conditioner cycle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic pilot type four-way valve (hereinafter simply referred to as "electromagnetic four-way valve") for switching the flow path of refrigerant during cooling and heating in a heat pump type refrigerant circuit.
That. In particular, the present invention relates to a four-way valve which can be operated even when the pressure of the refrigerant is high.

[0002]

2. Description of the Related Art A four-way valve not using a pilot solenoid valve, that is, a direct-acting type, has been proposed in Japanese Utility Model Laid-Open No. 3-14681. As shown in FIG. 7, the direct acting type four-way valve includes a cylindrical valve body 50 and an electromagnet 51 disposed on an upper portion thereof. The valve body 5
Numeral 0 denotes a metal disc-shaped valve seat 57 and a plastic magnet thick disc-shaped valve body 59 disposed on the upper surface of the valve seat 57 so as to be slidable and rotatable about a metal shaft 58. , A center shaft 58 that rotatably supports the valve body 59, a cylindrical body 52 made of a non-magnetic material, and a cap 67.

[0003] The four openings 53, 54, 5
5, 56 are each a predetermined angle (90 degrees) as shown in FIG.
The openings 53 are used as inlets at intervals, and the openings 54 facing the opening 53 are used as outlets.
Are formed as through holes 55 and 56, respectively,
A stopper 60 made of a pipe is provided in a protruding shape only at the upper part of the pipe.

As shown in FIG. 8, through-holes 61 and 62 are provided in the thick disk-shaped valve body 59 at positions opposed to the inlet 53 and the through-hole 56 of the valve seat 57, and below the through-holes. A communication hole 63 that connects the two through holes 61 and 62 is provided in half, and an airtight communication hole 64 that airtightly connects the outlet 54 and the through hole 55 at a position corresponding to the outlet 54 and the through hole 55.
The lower portion of each of the communication holes 63 and 64 is formed in a planar arc shape, and by turning the valve body 59, the communication state is switched at each of the adjacent openings. .

[0005] The electromagnet 51 disposed above the valve body 50 in FIG.
Is wound, and a plastic magnet valve body 59 disposed under the coil 66 is rotated by the conversion of the N and S poles of the magnet by energizing the coil 66. This is performed between the stopper 60 of the valve seat 57 and the communication hole 63 of the valve body 59.

Further, in the refrigeration cycle using the above-described direct-acting type four-way valve, the following system has been proposed in which defrosting can be performed without performing reverse defrosting during heating operation.

FIG. 6 shows a so-called hot gas bypass defrost system, which differs from the basic refrigeration cycle shown in FIG. 5 which has been widely used when a pilot type four-way valve has been conventionally used. Parallel to F, two-way valve G
A hot bypass circuit H is connected to the hot bypass circuit H so that the discharge gas from the compressor C is guided to the outdoor heat exchanger F by bypassing the four-way valve A and the indoor heat exchanger D. Defrosting is performed by the discharged high-temperature gas refrigerant passing therethrough.

The direct acting type electromagnetic four-way valve has a structure in which the magnetic pole plates 68 and 69 of the electromagnet are made to correspond to the magnetic poles of the valve body 59 made of a plastic magnet. Rotate 90 degrees,
The flow path of the refrigerant in the heat pump refrigeration cycle is switched. However, in such a direct acting type four-way valve, since the valve body rotating torque is low, the valve body cannot be operated unless the pressure difference between the pressure above and below the valve body of the four-way valve is reduced. There was a problem.

In order to solve the above problems, a four-way valve for an air conditioner capable of reversing defrosting with a small driving force even during a heating operation has been proposed in Japanese Patent Application Laid-Open No. Hei 8-247328. . FIG. 9 is a longitudinal sectional view of the four-way valve, and FIG. 10 is a perspective view of a valve body portion of the four-way valve. The four-way valve for an air conditioner is configured as follows. That is, the valve body 1 is formed of a cylindrical body 2, a disk-shaped valve seat 3, a thick disk-shaped valve element 4, and a permanent magnet auxiliary valve 5. In addition, at the axis of the valve seat 3,
A shaft 6 to which the valve body 4 is attached is provided upright.
Is attached to the lower end of the body 2 by brazing or the like. The valve seat 3 has an inlet 7 and an outlet 8 and a through hole A9 and a Hole B10 is arranged.

The outlet 8 and either the through hole A9 or the through hole B10 are alternately provided in the valve body 4 at a position facing the guide hole 18 with the rotation of the valve body 4 in the left-right direction. A low-pressure side communication groove 21 having a substantially semilunar shape is formed so as to be in close communication with the valve. At the center of the upper surface of the communication groove 21, a small-diameter hole 22 connecting the communication groove 21 and the upper part of the valve element 4 is formed. , Provided at a position facing the connecting body 19.

The auxiliary valve 5 has a cylindrical body rotatably fitted on the outer periphery of the valve body 4 and is divided into a substantially semicircular shape with two corresponding gaps 29, one of which is an S-pole. And the other is N
The central portion of the upper surface of each of the two body portions, which is polarized and polarized, is formed into a sealing band portion 2 having a width slightly larger than the diameter of the hole 22 of the valve body.
The seal strip 27 has a hole 28 at the center thereof through which the shaft 6 passes.
The dimension of the gap 29 in the body of the auxiliary valve 5 is set slightly smaller than the free length of the springs A25 and B26 fitted in the two projections 23 and 24 protruding from the main body 4. A hole 28 in the axial center portion of the auxiliary valve 5 is inserted into the shaft 6 and is fitted and fixed to the projections A23 and B24 of the valve body 4.
Is mounted on the outer periphery of the valve body 4 so as to fit into both gaps 29 of the body of the auxiliary valve 5, and is mounted so as to be rotatable about the shaft 6. The auxiliary valve 5 is formed of a plastic magnet, and its magnetic force is generated by a spring A2.
5. It is set stronger than the spring force of the spring B26.

A body cap 30 is mounted on the upper part of the cylindrical body 2. A valve chamber 32 is provided between the body cap 30 and the upper surfaces of the valve body 4 and the auxiliary valve 5.
Are formed. A positioning concave portion 31 is formed outside the upper surface of the body cap 30, and is fitted to a lower end of a positioning convex portion 39 which is disposed on the lower surface of the electromagnet 35 as shown in FIG. The upper end of the shaft 6 is axially fixed by a concave portion on the lower surface of the center of the shaft 30.

An electromagnet 35 having a lead wire A33 and a lead wire B34 is disposed on the upper part of the valve body 1, and an arc-shaped iron core A36 extending from the lower end of the outer periphery of the electromagnet is provided. A core B37 is fitted to the outer portion of the cylindrical body 2 from above, and the iron core A36 and the iron core B37 are located at positions corresponding to the S pole and the N pole of the auxiliary valve 5 via the cylindrical body 2. It is detachably attached and fixed by a retaining ring 38. In this positioning, the positioning projection 39 provided on the lower surface of the electromagnet 35 is fitted to the positioning recess 31.

By the way, in the four-way valve shown in FIG. 9, the thick disk-shaped valve disposed on the upper surface of the valve seat is reversibly rotated by the driving means disposed on the upper part of the valve and the cooling / heating cycle is performed. In the switching of the cooling and heating cycle, the auxiliary valve 5 is first operated to open the hole 22 provided above the communication groove 21 on the low pressure side, and the high pressure acting on the valve body 4 is switched. The refrigerant pressure on the side is released to the low pressure side to eliminate the pressure difference between the upper and lower portions of the valve body 4, and then the valve body is rotated to switch the cooling / heating cycle.

[0015]

However, in the four-way valve for an air conditioner shown in FIG. 9, not only an auxiliary valve having a complicated structure is required, but also a four-way valve provided above the communication groove 21 on the low pressure side. The high-pressure refrigerant in the upper part of the valve element 4 is released to the communication groove 21 on the low-pressure side through the hole 22 to eliminate the pressure difference between the upper and lower parts of the valve element 4. Because of the enormous amount of refrigerant that lasts, it takes a considerable amount of time to eliminate the pressure difference between the top and bottom of the valve element, which is not preferable for controlling an air conditioner.

Further, the hole 22 is sealed by the sealing band 27 of the auxiliary valve 5, but the sealing property is unstable and lacks reliability.

In addition, the driving source for the operation of returning the auxiliary valve 5 slightly in the reverse direction after the rotation of the valve body 4 and sealing the hole 22 with the seal band is a spring A25 and a spring B26. Since the force is proportional to the amount of displacement between the valve element 4 and the auxiliary valve 5, the urging force is weakened with the closing operation of the auxiliary valve, and there is a risk that the auxiliary valve cannot be returned to the completely closed position.

[0018]

SUMMARY OF THE INVENTION According to the present invention, in the initial stage of the switching of the cooling and heating cycle, the auxiliary valve is opened by rotating the permanent magnet by switching the magnetic poles of the two magnetic pole plates by energizing the electromagnetic coil. The auxiliary valve seat is opened by rotating the valve by an arbitrarily set amount with respect to the body, the pressure chamber above the valve body is set to a low pressure close to the pressure of the low pressure communication hole, and the pressure of the low pressure pressure chamber is reduced. The valve body is raised by the pressure difference with the inner surface of the valve body, and the pressure of the high pressure side refrigerant that presses the valve body to the valve seat during operation is released to the low pressure side to eliminate the pressure difference between the top and bottom of the valve body. The pilot type electromagnetic four-way valve is characterized in that the valve element is rotated by the rotation of the permanent magnet, the auxiliary valve 77 is operated and the valve element is rotated by one coil, and the cooling / heating cycle is switched. is there.

That is, in the pilot type electromagnetic four-way valve according to the first invention, a metal case 73 made of a non-magnetic material for accommodating a valve body 72 is provided in a thick disk-shaped valve seat 71.
The valve body 72 is rotatably and vertically movable supported on a shaft 74, and the space between the upper part of the valve body 72 and the case 73 is a pressure chamber 85, and a permanent space disposed on the side of the valve body 72. An electromagnetic pilot four-way valve in which a valve body 72 disposed on an upper surface of a valve seat 71 is reversibly rotated by driving means by a magnet 75 and magnetic pole plates 98 and 99 of an electromagnetic coil 96, wherein the valve body An auxiliary valve seat 83 for communicating the pressure chamber 85 with the low-pressure communication hole 81 and the pressure chamber 8
5 and a high-pressure communication hole 82, a small hole 84 is provided, a boss 72a is provided at the center of the upper surface of the valve body 72, and a torsion coil spring 7 is provided at a position away from the center of the valve body.
8 is provided with an auxiliary valve support portion 95 on the lower surface at the upper end of a ring-shaped permanent magnet that is loosely fitted to the valve body 72, and is opposed to the support portion 95. A rotating band 76 having a rotating band engaging portion 80 provided in a hanging manner is fixed. A torsion coil spring 78 is fitted into the boss portion 72a of the valve body, and a locking piece 78a of the spring is fitted. 78b
In a state where a load is applied by contracting into a U-shape, the valve body protruding portion 79 and the rotating band engaging portion 80 are brought into contact with each other,
At the initial stage of the switching of the cooling and heating cycle, the energization of the electromagnetic coil 96 causes the rotation band 76 fixed to the permanent magnet 75 to rotate, and this rotation opens one of the locking pieces 78a or 78b of the torsion coil spring,
The auxiliary valve 77 is opened from the auxiliary valve seat portion 83, the pressure chamber 85 is set to a low pressure close to the low pressure side, the valve body 72 is floated from the valve seat 71, and the valve body 72 is rotated by a predetermined angle. When the power to the electromagnetic coil 96 is turned off,
7 returns to the opposite direction by the action of the torsion coil spring 78 and closes the auxiliary valve seat portion 83, so that the operation of the auxiliary valve and the rotation of the valve element are performed by one coil, thereby switching the cooling / heating cycle. It is a feature.

Further, in the pilot type electromagnetic four-way valve according to the second invention, a seal ring 105 is provided between an outer peripheral surface of the valve body 72 and an inner peripheral surface of the case 73. 1.

Further, in the pilot type electromagnetic four-way valve according to the third aspect of the invention, two convex portions 106 are provided on an outer peripheral portion of the valve body 72 so as to face each other, and a permanent magnet which is loosely fitted to the outside of the valve body 72. In the case where two concave portions 105 are provided on the inner peripheral portion corresponding to the convex portions 106, the circumferential width of the permanent magnet concave portion 105 is larger than the circumferential width of the valve body convex portion 106. Is set to be large, and a gap 107 is provided on the left and right of the valve body convex portion 106 so that the valve body convex portion 106 can freely rotate in the permanent magnet concave portion 105. Auxiliary valve 7 that rotates with
After the valve 7 has opened the auxiliary valve seat 83, the valve body 72 is moved to the permanent magnet 75 by filling the one gap 107.
The present invention according to claim 1 or claim 2, which is integrally rotated.

Further, in the pilot type electromagnetic four-way valve according to the fourth aspect of the invention, the auxiliary valve seat 83 has a cross-sectional area sufficiently larger than the cross-sectional area of the small hole 84 to provide an auxiliary valve at the beginning of the switching of the cooling / heating cycle. 4. The pressure chamber 85 above the valve body 72 quickly becomes a low pressure close to the pressure of the low pressure communication hole 81 when the valve seat portion 83 is opened, according to claim 1. 4. belongs to.

Further, in the pilot type electromagnetic four-way valve according to the fifth invention, a ball valve is used as the auxiliary valve 77 for sealing the auxiliary valve seat portion 83. It is what is described in.

A pilot type electromagnetic four-way valve according to a sixth aspect of the present invention is provided at the center of a valve seat 71 and supports an upper end of a shaft 74 for rotatably and vertically moving a valve body 72. 4. The device according to claim 1, wherein the support is provided at an upper portion.

Further, in the pilot type electromagnetic four-way valve according to the seventh aspect of the present invention, the electromagnetic coil 96 disposed at the upper part of the valve main body is turned sideways, so that the magnetic pole plate A98 and the magnetic pole plate B99 are not greatly bent. 4. The device according to claim 1, wherein the outer peripheral portion is disposed.

In the pilot type electromagnetic four-way valve according to the eighth aspect of the present invention, a thick disk-shaped valve seat 71 is provided with a metal case 73 made of a non-magnetic material for accommodating a valve body 72. The valve body 72 is rotatably and vertically movable on a shaft 74 supported on the upper part of the case 73.
The space between the upper part and the case 73 is a pressure chamber 85, and is driven by a permanent magnet 75 disposed on the side of the valve body 72 and magnetic pole plates 98 and 99 of an electromagnetic coil 96 disposed laterally on the upper part of the valve body. An electromagnetic pilot four-way valve configured to reversibly rotate a valve body 72 disposed on an upper surface of a valve seat 71, wherein a pressure chamber 85 and a low-pressure communication hole 81 communicate with the upper surface of the valve body 72. When providing a small hole 84 for communicating the auxiliary valve seat portion 83 and the pressure chamber 85 with the high-pressure communication hole 82, the sectional area of the auxiliary valve seat portion (83) is made sufficiently large with respect to the sectional area of the small hole 84. A boss 72a is provided at the center of the upper surface of the valve body 72, and a valve body projection 79 for engaging a torsion coil spring 78 is provided at a position away from the center of the valve body 72. Surface and inner peripheral surface of case 73 Between the seal ring 105 is provided, further, the two convex portions 106 on the outer periphery of the valve body 72
The permanent magnet 75, which is loosely fitted to the outside of the valve body 72, has two concave portions 105 on its inner periphery corresponding to the convex portions 106.
6, the circumferential width of the permanent magnet recess 105 is set to be larger than the circumferential width of the valve body 6, and gaps 107 are provided on the left and right of the valve body convex portion 106 so as to allow the outer periphery of the valve body 72 to be loose. At the upper end of the ring-shaped permanent magnet to be fitted, an auxiliary valve support portion 95 formed in a ball shape on the lower surface and an engaging portion 80 of a rotating band provided to face the support portion 95 in a hanging shape. The rotating band 76 provided is fixed, and a boss 72a at the center of the valve body is provided.
The valve body projecting portion 79 and the engaging portion 80 of the rotary belt are fitted with a torsion coil spring 78 and a load is applied by compressing the locking pieces 78a and 78b of the spring into a U-shape. At the initial stage of the switching of the cooling and heating cycle, the energization of the electromagnetic coil 96 causes the rotation band 76 fixed to the permanent magnet 75 to rotate, and this rotation causes any of the locking pieces 78a or 7
8b is opened, the auxiliary valve 77 is opened from the auxiliary valve seat portion 83, the pressure chamber 85 is set to a low pressure close to the low pressure side, and the valve body 72 is floated from the valve seat 71. Is embedded, the valve body 72 rotates integrally with the permanent magnet 75, and the power to the electromagnetic coil 96 is turned off by O.
When the FF is used, the rotating belt 77 is a torsion coil spring 78
In this manner, the auxiliary valve seat portion 83 is closed by returning in the reverse direction by the action of (1), whereby the operation of the auxiliary valve and the rotation of the valve element are performed by one coil, and the cooling / heating cycle is switched. .

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a pilot type electromagnetic four-way valve according to the present invention, in an initial stage of switching of a cooling / heating cycle during operation, an auxiliary valve seat portion is opened by energizing an electromagnetic coil, and a pressure above a valve body is reduced. A pressure difference occurs between the top and bottom of the valve body, and the valve body rises, so that the pressure of the high-pressure refrigerant that presses the valve body against the valve seat during operation can be released to the low-pressure side. Since the pressure difference between the upper and lower sides is eliminated, the rotation of the valve body thereafter can be performed with a small force.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of a pilot type electromagnetic four-way valve of the present invention, FIG. 2 is an exploded perspective view of a valve body and a valve seat, and FIG. It is.

The valve body (no reference numeral) includes a metal case 73 made of a non-magnetic material, a thick disk-shaped valve seat 71 attached to a lower end of the case 73, and a rotatable and The valve body 72 includes a valve body 72 that is vertically movable and a permanent magnet 75 that is loosely fitted to the outer peripheral surface of the valve body 72 and that is coaxially rotatable with respect to the valve body 72. A positioning projection 103 for positioning the magnetic pole plate A98 and the magnetic pole plate B99 is provided on a lower portion of the outer surface of the case 73.
104 are provided. A seal ring 105 is provided between the outer peripheral surface of the valve body 72 and the inner peripheral surface of the case 73.
Is provided.

At the axis of the valve seat 71, a shaft 74 for mounting a valve body 72 is implanted.
3 supported at the top. This valve seat 71 is
The valve seat 71 is provided with an inlet 87 and an outlet 86 on a circumference centered on the axis of the valve seat 71 as shown in FIG. The through holes 88 and the through holes 89 are arranged at 90 ° intervals so as to face each other. In addition, an inlet pipe 91 communicating with the discharge side of the compressor is attached to the inlet port 87, and an outlet pipe 90 communicating with the suction side of the compressor is attached to the outlet port 86. Are provided with a through-hole tube 92 and a through-hole tube 93, respectively.
Are connected to the indoor heat exchanger D and the outdoor heat exchanger F shown in FIG.

A metal case 7 made of the non-magnetic material
3, a valve body 72 has its axial center portion penetrated by the shaft 74, and is rotatably and vertically movable on a valve seat 71. As shown in FIG. By rotating the valve body 72 90 degrees in the left-right direction, a substantially semi-lunar high-pressure communication hole 82 that alternately communicates the introduction port 87 with either the through hole 88 or the through hole 89 is formed. Further, a small hole 84 for gradually releasing the pressure of the high-pressure communication hole 82 is formed above the high-pressure communication hole 82.

The high pressure communication hole 82 is provided in the valve body 72.
A substantially half-moon-shaped low pressure side which alternately and airtightly communicates the outlet 86 and either the through hole 88 or the through hole 89 with the rotation of the valve body 72 in the left-right direction at a position opposed to the low pressure side. A communication hole 81 is formed. In addition, the low-pressure communication hole 81
An auxiliary valve seat 83 communicating with the pressure chamber 85 is formed at the upper part of the upper part.

At the inlet 87, a pipe-shaped stopper 94 protruding from the upper surface of the valve seat 71 is provided.
Along with the rotation, the stopper abuts on one end of the high-pressure communication hole 82 to control the rotation of the valve body 72.

The valve body 72 has a boss 72a at the center of the upper surface, and a valve body projection 79 for engaging a torsion coil spring 78 described below at a position away from the center of the valve body. Is provided, and is freely rotated on the valve seat 71 by a shaft 74 whose upper end is supported by an upper portion of the case 73.

As shown in FIG. 4, the valve body 72 is provided with two convex portions 106 on the outer periphery of the valve body 72 so as to face each other. When two recesses 105 are provided on the inner periphery of the permanent magnet 75 in correspondence with the protrusions 106, the circumferential width of the permanent magnet recesses 105 is larger than the circumferential width of the valve body protrusions 106. Is set to be large. The gap 107
Are void portions formed on the left and right of the valve body convex portion 106.

The ring-shaped permanent magnet 75 is connected to the valve body 72.
The rotating belt 76 is fixed to the upper end of the permanent magnet. In addition, the rotating belt 76 is provided with an auxiliary valve supporting portion 95 and an engaging portion 80 of the rotating belt which is provided in a drooping shape so as to face the supporting portion 95 on the lower surface thereof. The auxiliary valve support 95 is for controlling the opening of the auxiliary valve seat 83 by rotating the auxiliary valve 77 along with the rotation of the rotary belt 76. In addition, the engaging portion 80 of the rotating belt is for rotating the rotating belt 76 with respect to the valve body 72 via one of the locking pieces 78a and 78b of the coil spring 78 described later.

The torsion coil spring 78 includes locking pieces 78a,
78b. The torsion coil spring 78 is fitted in the boss portion 72a at the center of the valve body and compresses the locking pieces 78a and 78b into a U-shape to apply the load to the valve body projecting portion 79 and apply a rotation. The band is brought into contact with the engaging portion 80. At a position where the phase of the valve body projecting portion 79 and the rotating band engaging portion 80 in the rotational direction coincide with each other due to the urging force of the torsion coil spring 78, the auxiliary valve 77 may seal the auxiliary valve seat portion 83. I am able to do it.

In the state where power is not supplied to the electromagnetic coil 96 during the cooling / heating operation, the auxiliary valve 77 is at the position for sealing the auxiliary valve seat 83, but the electromagnetic valve 96 is not connected to the electromagnetic coil 96 at the initial stage of switching of the cooling / heating cycle. The energization causes the permanent magnet 75 to rotate, and the auxiliary valve support 95 formed in the rotating band 76 fixed to the permanent magnet 75 to rotate, so that the auxiliary valve 77 moves from the auxiliary valve seat 83. That is, the auxiliary valve 77 seals or opens the auxiliary valve seat portion 83 together with the rotation of the permanent magnet 75, and the pressure chamber 85 is set to a high pressure or a low pressure, respectively.

A lead wire A10 is provided above the valve body.
1. An electromagnetic coil 96 having a lead wire B102 is disposed horizontally, and an arc-shaped magnetic pole plate A98 and a magnetic pole plate B99 are provided extending below the electromagnetic coil 96 by an iron core 97 penetrating the inside of the electromagnetic coil 96. It is fixed by caulking or the like and fitted into the outer peripheral portion of the case 73 from above the case 73. As shown in FIG. 4, the magnetic pole plates A98 and B99 are connected to the S pole of the permanent magnet 75 (shaded portion in FIG. 4), N At the positions facing the poles, the lower ends of the pole plates A98 and B99 are attached and fixed by caulking or the like. This positioning is performed by positioning protrusions 103 and 104 provided below the case 73 and the magnetic pole plate A9.
9, positioning protrusions 10 at the lower end of the pole plate B100, respectively.
3 and 104 are engaged with recesses provided correspondingly.

Next, the use and operation of the pilot type electromagnetic four-way valve of the present invention will be described. FIG.
FIG. 4A is a diagram illustrating a positional relationship between a permanent magnet 75 and an auxiliary valve 77, and FIG. 4-A illustrates a set state during a heating operation. In this case, no DC current is applied to the electromagnetic coil 96, but the magnetic pole plate A98 and the magnetic pole plate B99 are magnetically connected by the iron core as shown in FIG.
A small counterclockwise rotating torque (holding torque) is applied to the permanent magnet 75 located between the magnetic pole plate B99 and the magnetic pole plate B99. As shown in FIG.
Is in contact with one end side of the camera. That is, the high-pressure communication hole 8
2 through hole 8 leading to inlet 87 and indoor heat exchanger D
9 is in communication. In addition, the low pressure communication hole 8
By 1, the outlet 86 and the through hole 88 connected to the outdoor heat exchanger F are in communication.

Therefore, as shown by the solid arrow in FIG. 5, the refrigerant flowing out of the discharge port of the compressor C is supplied to the inlet pipe 91 and the inlet port 8.
7, through the through-hole 89, through the through-hole pipe 92, into the indoor heat exchanger D, through the capillary E, through the outdoor heat exchanger F,
It returns to the suction port of the compressor C via the through-hole pipe 93, the through-hole 88, the outlet 86, and the outlet pipe 90.

Next, in the state shown in FIG. 4A, when a direct current is applied to the lead wire A101 of the electromagnetic coil 96, the magnetic pole plate A98 becomes the S pole as shown in FIG. Becomes the N pole, and the opposite S pole and N pole of the permanent magnet 75 and the magnetic pole plate A98 and the magnetic pole plate B99 have the same polarity, so that a repulsive force is generated and a clockwise rotational moment is applied to the permanent magnet 75.

At this time, the valve body 72 cannot be rotated with a small force because the pressure chamber 85 is pressurized by the valve seat 71 due to the high pressure of the refrigerant in the high pressure state, but the permanent magnet 75 is rotatable with respect to the valve body 72. , The gap 10 due to the dimensional difference in the rotation direction between the valve body convex portion 106 and the permanent magnet concave portion 105 together with the rotating belt 76 fixed to the permanent magnet 75.
It can rotate until 7 is filled.

That is, the phases of the valve body 72 and the permanent magnet 75 in the rotation direction are shifted until the gap 107 is filled.
Auxiliary valve seat 83 provided on valve body 72 and auxiliary valve support 9 provided on rotating band 76 fixed to permanent magnet 75
5, the auxiliary valve 77 is shifted with respect to the auxiliary valve seat 83, so that the auxiliary valve seat 83 is opened. At this time, the sectional area of the auxiliary valve seat portion 83 provided so as to communicate the low-pressure communication hole 81 formed on the inner surface of the valve body 72 with the pressure chamber 85 above the valve body is such that the high-pressure communication hole 82 is formed above the valve body. Since the cross-sectional area of the small hole 84 provided to communicate with the pressure chamber 85 is set to be sufficiently large, and the pressure chamber 85 above the valve body 72 has a low pressure close to the pressure of the low-pressure communication hole 81, the valve The valve body 72 rises due to the pressure difference between the inner surface of the body 72 and the pressure of the refrigerant on the high pressure side that presses the valve body 72 against the valve seat 71 during operation to the low pressure side during operation, thereby causing a pressure difference between the upper and lower sides of the valve body. And the repulsive force of the magnetic force causes the valve element 7
2 and the permanent magnet 75 rotate together to the state shown in FIG.

When the valve body 72 rises due to the pressure difference, the valve body 72 moves away from the valve seat 71 to open the high-pressure communication hole 82. However, the seal ring 105 connects the high-pressure communication hole 82 to the pressure chamber 85. The degree is kept at the cross-sectional area of the small hole 84. That is, with the seal ring 105, the sectional area of the auxiliary valve seat portion 83 does not need to be sufficiently large with respect to the sum of the sectional area of the small hole 84 and the clearance area due to the valve body 72 being separated from the valve seat 71. What is necessary is just to make it large enough only for the cross-sectional area of the small hole 84,
Reference numeral 5 plays a role in reducing the size of the auxiliary valve seat 83 and, consequently, the electromagnetic pilot type four-way valve of the present invention.

Here, as shown in FIG. 3, the valve body projecting portion 79 formed on the upper portion of the valve body 72 and the engaging portion 80 of the rotating band formed below the rotating band 76 are sandwiched. The torsion coil spring 78 is disposed coaxially with the valve body 72.
Only when the phase in the rotation direction of the auxiliary valve seat portion 83 and the auxiliary valve 77 is out of alignment, the auxiliary valve seat portion 83 and the auxiliary valve 77 are arranged so as to be urged in the direction of matching the phases. When the auxiliary valve seat 83 and the auxiliary valve 77 are slightly out of phase in the rotational direction, the biasing force generated by the spring is not proportional to the amount of the deviation even if the phases in the rotation direction of the auxiliary valve seat 83 and the auxiliary valve 77 are slightly shifted. And the rate at which the biasing force increases with an increase in the amount of displacement can be reduced.

The urging force of the set state of the torsion coil spring 78 is larger than the rotation moment (holding torque) applied to the permanent magnet 75 when the electromagnetic coil 96 is not energized (FIG. 4A). , Electromagnetic coil 96
Is smaller than the rotational moment applied to the permanent magnet 75 when the power is supplied to the motor (FIG. 4-B).

When a DC current is applied to the electromagnetic coil 96, the magnetic pole plates A98 and B99 depend on the direction of the energization.
Becomes an S pole or N pole, an N pole or an S pole, and a clockwise or counterclockwise rotational moment is applied to the permanent magnet 75 by the repulsive force with the polarity of the permanent magnet 75.
6 is oriented horizontally, and the magnetic pole plates A98 and B99 are arranged to the outer peripheral portion of the case 73 without largely bending, so that the leakage of magnetic flux caused by applying a direct current to the electromagnetic coil 96 is minimized. As a result, even if a small electromagnetic coil is used, a predetermined rotational moment is generated in the permanent magnet.

In the state shown in FIG.
Is in contact with the other end of the high-pressure communication hole 82 and the rotation of the valve body 72 is stopped, but a direct current is applied to the lead wire A101 of the electromagnetic coil 96, and the permanent magnet 7
5, the clockwise rotation moment is still applied, and the auxiliary valve 77 is shifted with respect to the auxiliary valve seat 83, so that the auxiliary valve seat 83 is open.

By applying a direct current to the lead wire A101 of the electromagnetic coil 96, the state shown in FIG.
After the state of FIG. 4C has been operated through the state of FIG. 4C and the power supply to the lead wire A101 of the electromagnetic coil 96 is stopped,
The clockwise rotation moment applied to the permanent magnet 75 disappears, and the biasing force of the torsion coil spring 78 eliminates the displacement between the auxiliary valve seat 83 and the auxiliary valve 77, thereby rotating the auxiliary valve seat 83 and the auxiliary valve 77. Directions are in phase,
The auxiliary valve 77 seals the auxiliary valve seat 83, and the state shown in FIG. At this point, the high-pressure refrigerant in the high-pressure communication hole 82 flows into the pressure chamber 85 through the small hole 84,
A pressure difference occurs between the upper portion of the valve body 72 and the inner surface of the valve body, and the valve body 7
2 is pressed against the upper surface of the valve seat 71 and is brought into close contact therewith.

When the auxiliary valve 77 seals the auxiliary valve seat 83 by the urging force of the torsion coil spring 78, the valve 7
Reference numeral 2 denotes an ascending state, and the ascending operation is regulated by abutment of the valve body boss portion 72a on the upper portion of the case 73. In other words, since the valve element 72 is in direct contact with the case, the permanent magnet 75 integrated with the rotary belt 76 located above the valve element 72 is in a state where it can freely rotate. Even if the urging force is small, the auxiliary valve 77 can seal the auxiliary valve seat 83.

When the energization of the lead wire A101 of the electromagnetic coil 96 is stopped, the clockwise moment due to the energization applied to the permanent magnet 75 disappears, and at the same time, as shown in FIG.
In the same manner as the weak rotation moment (holding torque) in the counterclockwise direction at the time of de-energization described above in -A, a weak rotation torque (holding torque) in the opposite direction, that is, clockwise, is applied. The biasing force of the set state of the spring 78 is larger than the rotational moment (holding torque) applied to the permanent magnet 75 when the electromagnetic coil 96 is not energized, and is applied to the permanent magnet 75 when the electromagnetic coil 96 is energized. Since the torque is set to be smaller than the rotational moment, the urging force of the torsion coil spring 78 overcomes the rotational moment (holding torque) applied to the permanent magnet 75 when the electromagnetic coil 96 is not energized, so that the auxiliary valve seat 83 and the auxiliary valve 77 The displacement is eliminated and the auxiliary valve seat 83 and the auxiliary valve 77
Are in phase with each other in the rotation direction, and the auxiliary valve 77 is
3 will be sealed.

Therefore, as shown by the broken arrow in FIG. 5, the refrigerant flowing out of the discharge port of the compressor C is supplied to the inlet pipe 91 and the inlet port 8.
7, through the through hole 88, into the outdoor heat exchanger F through the through hole tube 93, through the capillary tube E, through the indoor heat exchanger D,
It returns to the suction port of the compressor C via the through-hole pipe 92, the through-hole 89, the outlet 86, and the outlet pipe 90, and forms a cooling operation circuit.

When a direct current is applied to the lead wire B102 of the electromagnetic coil 96 in the state shown in FIG. 4D, the state shown in FIG. The operation proceeds in the same manner as that described above, but symmetrically, from FIG. 4-D to FIG. 4-F via FIG. 4-E.

By applying a direct current to the lead wire B102 of the electromagnetic coil 96, the state shown in FIG.
After the state shown in FIG. 4-F has been operated through the state E, when the energization of the lead wire B102 of the electromagnetic coil 96 is stopped,
The operation proceeds from the state shown in FIG. 4C to the state shown in FIG. FIG. 4-A again
Is switched to the heating operation state.

[0056]

In the pilot type electromagnetic four-way valve according to the present invention, the auxiliary valve seat 83 is opened before the valve body 72 is rotated during operation, and the pressure difference between the upper and lower sides of the valve body 72 is eliminated. The valve body 72 can be easily rotated by the repulsive force of the permanent magnet 96 and the permanent magnet 75.

Therefore, the circuit can be switched even during the cooling or heating operation, and the conventional pilot-operated four-way valve does not require a hot bypass circuit or a liquid bypass circuit or a two-way valve, which are required for the conventional defrosting operation. The defrosting operation can be performed with the same circuit as the valve, and a significantly inexpensive and compact four-way valve can be provided.

The auxiliary valve 7 for sealing the auxiliary valve seat 83
The use of a ball valve for 7 makes it possible to provide a four-way valve in which the sealing performance of the auxiliary valve 77 is stabilized and the reliability is enhanced.

In addition, the torsion coil spring 78, which urges the auxiliary valve seat 83 and the auxiliary valve 77 so that the phases in the rotational direction coincide with each other, shifts the phase of the auxiliary valve seat 83 and the auxiliary valve 77 in the rotational direction. Only when the torsion coil spring 78
Is not in a free state but is placed under a load, so that even if the phases of the auxiliary valve seat portion 83 and the auxiliary valve 77 in the rotation direction slightly shift, the biasing force generated by the spring is the shift amount. , And the rate at which the biasing force increases with an increase in the amount of displacement can be reduced, so that the biasing force does not weaken with the closing operation of the auxiliary valve 77, It is possible to provide a four-way valve having a reliable auxiliary valve closing operation without a risk that the valve cannot be returned to the completely closed position.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a valve body according to one embodiment of the present invention.

FIG. 3 is a diagram showing a relationship between a valve body and a rotary band according to an embodiment of the present invention.

FIG. 4 is a transverse sectional view showing the positional relationship among the valve element, the permanent magnet, and the auxiliary valve in the section taken along line II of FIG. 1;

FIG. 5 is a basic circuit diagram of the air conditioner.

FIG. 6 is a circuit diagram of an air conditioner provided with a hot bypass circuit.

FIG. 7 is a longitudinal sectional view of a conventional four-way valve.

FIG. 8 is an exploded perspective view of a valve seat and a valve body in a conventional four-way valve.

FIG. 9 is a longitudinal sectional view of another conventional four-way valve.

FIG. 10 is a perspective view of a valve body portion of another conventional four-way valve.

[Explanation of symbols]

A four-way valve B expansion valve
C Compressor D Indoor heat exchanger E Capillary
F Outdoor heat exchanger G Two-way valve H Hot bypass circuit I Liquid bypass circuit 71 Valve seat 72 Valve body
73 Case 74 Shaft 75 Permanent magnet
76 Rotating band 77 Auxiliary valve 78 Torsion coil spring
79 Valve body protruding part 80 Engagement part of rotating belt 81 Low pressure communication hole
82 High pressure communication hole 83 Auxiliary valve seat 84 Small hole
85 Pressure chamber 86 Outlet 87 Inlet
88 Through hole 89 Through hole 90 Outgoing pipe
91 Inlet tube 92 Through hole tube 93 Through hole tube
94 Stopper 95 Auxiliary valve support 96 Electromagnetic coil
97 Iron core 98 Magnetic pole plate A 99 Magnetic pole plate B 101 Lead wire A 102 Lead wire B 103 Positioning protrusion 104 Positioning protrusion 10
5 Seal ring

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F25B 41/04 F25B 41/04 C

Claims (8)

[Claims] A valve disc (72) is provided on a thick disc-shaped valve seat (71).
Metal case made of non-magnetic material for storing
(73), the valve body (72) is rotatably and vertically movable supported on a shaft (74), and an upper part of the valve body (72) and a case.
The space between the valve (73) and the pressure chamber (85) is defined by a permanent magnet (75) disposed on the side of the valve body (72) and the magnetic pole plates (98) and (99) of the electromagnetic coil (96). The valve seat (7
An electromagnetic pilot four-way valve configured to reversibly rotate a valve element (72) disposed on the upper surface of 1), wherein an upper surface of the valve element (72) is in low-pressure communication with a pressure chamber (85). Hole
(81) and an auxiliary valve seat (83) for communicating with the pressure chamber.
(85) and a small hole (84) for communicating with the high-pressure communication hole (82), and further, a boss (72a)
And a valve body projection (79) for engaging a torsion coil spring (78) at a position away from the center of the valve body.
At the upper end of a ring-shaped permanent magnet that is loosely fitted to the valve body (72), an auxiliary valve support (95) is provided on the lower surface and provided in a drooping shape facing the support (95). A rotating band (76) provided with a rotating band engaging portion (80) is fixed, and a torsion coil spring (7) is attached to the boss (72a) of the valve body.
8) and fitting pieces (78a) and (78a) of the spring.
b) is contracted into a U-shape to make it come into contact with the valve body projecting portion (79) and the rotating band engaging portion (80) in a loaded state, and at an initial stage of switching of the cooling and heating cycle, The energization of the electromagnetic coil (96) causes the rotation band (76) fixed to the permanent magnet (75) to rotate, and this rotation opens one of the locking pieces (78a or 78b) of the torsion coil spring, and Open the valve (77) from the auxiliary valve seat (83),
The pressure in the pressure chamber (85) is set to a low pressure close to the pressure on the low pressure side, and the valve body (7
2) is lifted from the valve seat (71), and then the valve body (72) is rotated by a predetermined angle to turn on the electromagnetic coil (96).
F, the rotating belt (77) is a torsion coil spring (7
The auxiliary valve seat (83) is closed by returning in the reverse direction by the operation of 8), so that the operation of the auxiliary valve and the rotation of the valve element are performed by one coil, and the cooling / heating cycle is switched. Electromagnetic pilot operated four-way valve. 2. The electromagnetic pilot type four-way valve according to claim 1, wherein a seal ring 105 is provided between an outer peripheral surface of the valve body (72) and an inner peripheral surface of the case (73). . 3. A projection (106) on the outer periphery of the valve body (72).
The permanent magnet (75) loosely fitted on the outside of the valve body (72) has the convex portion (106) on its inner peripheral portion.
When providing two concave portions (105) corresponding to the width of the permanent magnet concave portion with respect to the circumferential width of the valve body convex portion (106).
The circumferential width of (105) is set large, and gaps (107) are provided on the left and right sides of the valve body protrusion (106), so that the valve body protrusion (106) in the permanent magnet recess (105). ) Can be freely rotated so that the permanent magnet (75)
The auxiliary valve (77) that rotates with the rotation of the auxiliary valve seat (8)
The valve body (72) rotates integrally with the permanent magnet (75) by closing the one gap (107) after the opening of (3). Electromagnetic pilot-operated four-way valve described in 1. 4. The cross-sectional area of said auxiliary valve seat (83) is reduced by a small hole.
When the auxiliary valve seat (83) is opened at the beginning of the switching of the cooling and heating cycle, the pressure chamber (85) above the valve body (72) is made sufficiently large with respect to the cross-sectional area of the valve (84).
4. The electromagnetic pilot type four-way valve according to claim 1, wherein the pressure quickly decreases to a pressure close to the pressure of the low-pressure communication hole (81). 5. An auxiliary valve (77) for sealing an auxiliary valve seat (83).
4. The electromagnetic pilot type four-way valve according to claim 1, wherein a ball valve is used. 6. A valve body (7) disposed at the center of a valve seat (71).
4. The electromagnetic pilot type four-way valve according to claim 1, wherein an upper end of a shaft (74) for rotatably and vertically moving the shaft (2) is supported on an upper part of the case (73). . 7. A magnetic pole plate A (98) and a magnetic pole plate B
The electromagnetic pilot type four-way valve according to claim 1, 2 or 3, wherein the (99) is disposed to the outer peripheral portion of the case (73) without being greatly bent. 8. A valve disc (72) is provided on a thick disc-shaped valve seat (71).
Metal case made of non-magnetic material for storing
(73), and a shaft supported on the upper part of the case (73).
The valve element (72) is provided rotatably and vertically movable in (74), the space between the upper part of the valve element (72) and the case (73) is a pressure chamber (85), and the valve element (72) The permanent magnet (75) arranged on the side of the valve and the electromagnetic coil (9
6) An electromagnetic pilot four-way valve in which a valve element (72) disposed on the upper surface of a valve seat (71) is reversibly rotated by a driving means including the magnetic pole plates (98) and (99). A pressure chamber (85) and a low-pressure communication hole are provided on the upper surface of the valve body (72).
(81) and an auxiliary valve seat (83) for communicating with the pressure chamber.
When providing a small hole (84) for communicating the high pressure communication hole (82) with the high pressure communication hole (82), the cross-sectional area of the auxiliary valve seat (83) should be small.
(84) should be sufficiently large with respect to the cross-sectional area.
(72) A boss (72a) is provided at the center of the upper surface, and a torsion coil spring (7
8) is provided with a valve body projection (79) for engagement, and a seal ring () is provided between the outer circumferential surface of the valve body (72) and the inner circumferential surface of the case (73). , The valve body (72)
Two convex portions (106) are provided facing each other on the outer periphery of the permanent magnet (75) loosely fitted to the outside of the valve body (72), while the convex portion (106) is provided on the inner peripheral portion of the permanent magnet (75). In providing the two concave portions (105) corresponding to the above, the circumferential width of the permanent magnet concave portion (105) is set to be larger than the circumferential width of the valve body convex portion (106). A gap (107) is provided on the left and right sides of the valve body convex portion (106). A ball-shaped lower surface is formed at the upper end of a ring-shaped permanent magnet that is loosely fitted to the outer periphery of the valve body (72). A rotating band (76) including an auxiliary valve supporting portion (95) and a hanging band engaging portion (80) provided to face the supporting portion (95) is fixed, and the valve body center portion is fixed. The boss portion (72a) is fitted with a torsion coil spring (78), and the locking piece (78a) of the spring is
(78b) is compressed into a U-shape to apply a load to the valve body projecting portion (79) and the rotating band engaging portion (80).
In the initial stage of the switching of the cooling and heating cycle, the energization of the electromagnetic coil (96) causes the rotation band (76) fixed to the permanent magnet (75) to rotate, and this rotation causes any of the torsion coil springs to rotate. The locking piece (78a or 78b) is opened, and the auxiliary valve (77) is opened from the auxiliary valve seat (83),
The pressure in the pressure chamber (85) is set to a low pressure close to the pressure on the low pressure side, and the valve body (7
2) is floated from the valve seat (71), and at the same time, when the one gap (107) is filled, the valve body (72) rotates integrally with the permanent magnet (75), and the electromagnetic coil (96) When the power supply to the switch is turned off, the rotating belt (77) returns to the opposite direction by the action of the torsion coil spring (78), and the auxiliary valve seat portion is turned off.
An electromagnetic pilot type four-way valve characterized in that, by closing (83), the operation of the auxiliary valve and the rotation of the valve element are performed by one coil to switch the cooling / heating cycle.