JPH11118050A - Sealed direction control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealed direction control valve that can miniaturize permanent magnets and electromagnetic coils and is compact and can be manufactured at low cost and shorten the time required for restoring to heating operation from defrosting an external heat exchanger where it is employed to an air conditioner. SOLUTION: This sealed direction control valve comprises a sealed valve case 1 fixedly provided with a valve seat 5 at the lower end, a permanent magnet 6 rotatably arranged in the sealed valve case 1, a main valve 7 rotatably arranged in the sealed valve case 1 and generating force to press the valve seat 5 by the pressure of the fluid passing through a plurality of flow passages 27, 28 and 29 communicated in the sealed valve case 1, and an electromagnetic coil 9 positioned inside the permanent magnet 6 and giving torque to the permanent magnet 6. By connecting a valve chamber 14 formed by the main valve 7 and the valve seat 5 and a valve chamber 13 in the sealed valve case 1, providing a communication hole 15 reducing the force generated by the main valve 7 to press the valve seat 5 and the rotation of the electromagnetic coil 9, the communication hole is opened and closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic directional control valve which can be used mainly as a four-way valve for controlling the direction of an air conditioner or a refrigerator.

[0002]

2. Description of the Related Art Conventionally, in a cooling / heating cycle of an air conditioner or the like, a four-way valve for directional control has been used to switch the flow direction of a sealed refrigerant during a cooling operation and a heating operation. . Therefore, as this kind of four-way valve, as disclosed in the invention relating to a four-way valve in Japanese Patent Application Laid-Open No. 8-42737, conventionally, Japanese Utility Model Application Laid-Open No. 54-165324, Japanese Patent Application Laid-Open No. 61-6486, and 3-307
Inventions and inventions such as No. 49 are known.

[0003] However, these conventional four-way valves are composed of a main valve element for switching the circuit and a pilot valve for operating the valve element, and a pipe for connecting the two is required, and the number of parts is large. However, since the construction is complicated and the assembly is troublesome, the cost is high. In addition, continuous heating is required for the pilot valve during the heating operation.

Another directional control valve is disclosed in Japanese Unexamined Patent Publication No.
As shown in the invention of No. 152075, a direct acting four-way valve is known. It consists of a valve body and an electromagnetic coil detachably mounted on the top of the valve body, the valve body being rotatable on the valve seat attached to the lower end of the cylindrical body and the inner surface of the body. It is composed of a permanent magnet and a resin valve provided, and is characterized in that it is compact and its manufacturing cost is lower than that of the above-described four-way valve.

However, the directional control valve has a structure in which the valve is directly moved by the attraction and repulsion of the permanent magnet and the electromagnetic coil. Therefore, the permanent magnet and the electromagnetic coil are enlarged in order to generate a driving force. As compared with the valve, there is a problem that although the manufacturing cost is low, the manufacturing cost still cannot be sufficiently reduced. Furthermore, since the direction control valve has a structure in which the valve is directly moved by the attraction and repulsion of the permanent magnet and the electromagnetic coil, the valve operation force is weak and the differential pressure operation performance is low.

On the other hand, during the heating operation of the air conditioner, the outdoor unit heat exchanger is periodically defrosted. In this operation, high-temperature refrigerant discharged from the compressor flows into the outdoor unit heat exchanger.
This is to remove the adhering frost. In addition, some air conditioners perform this defrosting operation by a bypass of a dedicated circuit, and others perform the operation by switching the circuit of a four-way valve. However, the indoor unit fan is stopped, and no cool air is blown into the room.

Further, when a rotary four-way valve that switches circuits by utilizing the repulsive force of an electromagnet and a permanent magnet is employed in a model that performs a defrosting operation by switching circuits, the circuit is controlled by a linear reciprocating four-way valve. The time required from defrosting to heating operation again needs to be at least twice as long as that switching from one to another. For example, the linear reciprocating type requires 1 to 1.5 minutes, whereas the rotary four-way valve requires about 3 minutes. Need a minute.

For the reason, during operation of the air conditioner, the inlet of the valve seat is connected to the discharge port of the compressor, the inside of the main body is also at a high pressure, and the outlet is connected to the suction port of the compressor. This is because the pressure is low in both of the communication grooves and the pressure difference causes the valve to be pressed against the valve seat, and the outflow of the refrigerant from the inlet side to the outlet side is regulated.

[0009]

DISCLOSURE OF THE INVENTION The present invention can reduce the size of a permanent magnet and an electromagnetic coil, can be produced compactly and at low cost, and when used in an air conditioner. Provided is a closed-type directional control valve capable of shortening a waiting time from defrosting of an outdoor heat exchanger to return to a heating operation during a heating operation.

[0010]

SUMMARY OF THE INVENTION The present invention provides a sealed valve case having a valve seat fixedly provided at a lower end portion, a permanent magnet rotatably disposed inside the sealed valve case, and a rotatable inside the sealed valve case. A main valve, which is arranged so as to be able to press against a valve seat by the pressure of a fluid passing through a plurality of flow paths communicating with the closed valve case, and a rotational force applied to the permanent magnet located inside the permanent magnet. A communication hole that reduces the pressing force of the main valve against the valve seat by conducting between the valve chamber formed by the main valve and the valve seat and the valve chamber in the closed valve case. A spring provided on the main valve and configured to open and close the communication hole by rotating an electromagnetic coil, and a spring for urging the rotor yoke and the main valve in a direction to close the communication hole. From the sealed directional control valve That.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view of a closed type directional control valve according to the present invention, and FIG. FIG. 3 is a cross-sectional plan view taken along the line BB in FIG. 1, FIG. 4 is a side cross-sectional view taken along the line CC in FIG. 3, and FIG. FIG. 4 is a sectional side view of a component development.

First, in the sealed type directional control valve, an inner case 3 is inserted from above into a cylindrical outer case 2 to weld each upper peripheral portion, and a valve is attached to a lower open end of the outer case 2. A sealed valve case 1 in which the seat 5 is fixed by welding or the like, and a permanent magnet 6 made of a donut-shaped magnet rotatably disposed inside the sealed valve case 1 together with a rotor yoke 17.
Is rotatably disposed inside the closed valve case 1 and connected to the closed valve case 1 via the valve seat 5 as shown in FIGS. A main valve 7 that generates a force pressing against the valve seat 5 due to a pressure difference between the fluids passing through the plurality of flow paths, and an electromagnetic coil 9 that applies a rotational force to the permanent magnet 6 via the inner case 3 of the closed valve case 1. The electromagnetic coil 9 is disposed inside the permanent magnet 6 by being provided inside the inner case 3.

Next, FIG.
The plurality of flow paths 27, 28, 29 and 30 shown in the plan view of FIG.
Among them, the flow path 27 is brazed to the discharge port of the compressor, and the high-pressure refrigerant fluid is introduced into the valve chamber 13 through the flow path 27 regardless of the valve position. The flow path 28
Is brazed to the suction port of the compressor, and low-pressure refrigerant fluid passes through the flow passage 29 regardless of the valve position,
It is discharged from 4.

Further, the flow path 29 is brazed to the indoor unit heat exchanger, and the flow path 30 is brazed to the outdoor unit heat exchanger. The flow path 29 is electrically connected to the flow path 27 or the flow path 28 depending on the valve position. Is selected. That is, when the valve is in a valve position where the flow path 27 and the flow path 29 are conductive and the flow path 28 and the flow path 30 are conductive, the heating operation is performed, and the flow path 27 and the flow path 30 are conductive and the flow path 28 is When the passage 29 is in the conducting valve position,
It becomes a cooling operation.

With such a configuration, the main valve 13 is strongly pressed in the direction of the valve seat 5 by the fluid that has entered the valve chamber 13, and the pressing force exerts a phenomenon that the main valve is hard to rotate. Therefore, the communication hole 15 for reducing the pressing force is provided with the main valve 7 shown in the side sectional view of FIG. 6, the plan view of the top view of FIG. 6, FIG. 7 and the plan view of the bottom face of FIG.
And a rotation of the electromagnetic coil 9,
The above-mentioned communication hole 15 is shown in a side sectional view shown in FIG.
The sub valve 21 provided on the lower surface of the rotor yoke 17 shown in FIG. 10 which is a plan view of the bottom surface in the −D direction is used as a pilot valve to perform opening and closing operations.

The permanent magnet 6, which is given a rotational force by energizing the electromagnetic coil 9, is provided with a slide ring 25 shown in FIG.
Therefore, the permanent magnet 6 rotates with the rotor yoke 17 via the fixed shaft 22 so that the main valve 7 rotates together with the rotor yoke 17. Further, between the rotor yoke 17 rotating integrally with the permanent magnet 6 and the main valve 7, an 8-shaped spring 24 shown in FIG. 11 is provided. Here, a round portion at the center of the figure-shaped spring 24 is fitted to the fixed shaft 22, and the other end is configured to hold the projection 8 of the main valve 7. The spring 24 is attached so as to bias the communication hole 15 in a direction in which the communication valve 15 is closed by the sub-valve 21.

The type and shape of the spring 24 are not particularly limited. Next, the above operation will be described with reference to FIGS. 11 and a series of operation explanatory diagrams from FIG. 12 to FIG. 15. First, FIG. 12 shows a state before operation, that is, a state in which the coil 11 of the electromagnetic coil 9 is not energized. The rotor yoke 17 to which the permanent magnet 6 is fixed is moved in the direction in which the hole 19 of the rotor yoke 17 shown in FIG. 11 contacts the stopper 4 of the inner case 3 due to the attraction between the permanent magnet 6 and the iron core 10 of the coil 11. Has been sucked. The width of the projection 8 of the main valve 7 in FIG. 6 is set slightly smaller than the width of the projection 16 of the rotor yoke 17 as shown in FIG. .

Next, when the coil 11 is energized from the state of FIG. 12 to the state of the operation 1 of FIG. 13, the rotor yoke 17 to which the permanent magnet 6 is fixed starts to rotate by the magnetic force, and the protrusion 8 of the main valve 7 The spring 24 is rotated while being bent until the gap 20 in the rotational direction at the portion where the hole 18 of the rotor yoke 17 is engaged disappears. In this position, the auxiliary valve 21 that rotates simultaneously with the rotor yoke 17
When the fluid flows from the outside to the inside of the main valve 7 and comes off from the communication hole 15, the pressures of the valve chamber 13 outside the main valve 7 and the valve chamber 14 inside the main valve 7 are balanced.

Next, if the frictional force between the main valve 7 and the valve seat 5 becomes smaller than the rotational force due to the electromagnetic force due to the pressure equilibrium as described above, as shown in the operation 2 in FIG.
The hole 18 of the rotor yoke 17 presses the projection 8 of the main valve 7, and the hole 19 of the rotor yoke 17
The main valve 7 rotates to a position where the main valve 7 contacts. Further, FIG.
5 shows a state in which the operation is completed, and the main valve 7
As a result, the rotor yoke 17 rotates to the center of the hole 19, and at the same time, the auxiliary valve 21 closes the communication hole 15.

The operations shown in FIGS. 12 to 15 are performed in the same manner in the reverse rotation. That is, the above-mentioned spring 24 functions to create a phase shift in the rotation of the main valve 7 and the sub-valve 21, and in particular, the main valve 7 is returned to the normal position, and the sub-valve 21 and the communication hole 15 are And the function of closing the communication hole 15 is achieved. According to the above-described electromagnetic coil 9, the iron core 10 and the coil 11 disposed in a concave portion formed outside the sealed valve case 1 composed of the outer case 2 and the inner case 3 welded by welding.
However, it is possible to use an epoxy resin 12 that has been poured and solidified for insulation.

In FIG. 5, when the main valve 7 is not in the valve operation, only the fixed shaft 22 is in contact with portions other than the valve seat 5, and an appropriate clearance is provided between the fixed shaft 22 and the main valve 7. Thereby, since it comes into contact with the valve seat 5 without being restricted by other parts, the sealing performance is improved. In FIG. 5, reference numeral 23 denotes a washer provided between the main valve 7 and the spring 24.

[0022]

According to the above-described closed type directional control valve of the present invention, the main main valve for switching the flow path,
Since this pressure control valve has a sub-valve which is a pilot valve for reducing a pressure difference due to the fluid introduced by the plurality of flow paths serving as a source of a force for pressing the main valve against the valve seat, The number of points is small, the structure is simple, and the assembly is easy.

Further, since power is supplied to the electromagnetic coil only for a few seconds when the flow path is switched, power consumption can be extremely reduced. Furthermore, by conducting between the two valve chambers having a pressure difference separated by the main valve and the valve seat, the pressure difference due to the fluid from the plurality of flow paths is almost eliminated, and the pressing force of the main valve against the valve seat is reduced. Because it can be greatly reduced, the rotational torque for operating the main main valve can be reduced, and the permanent magnets and electromagnetic coils that generate the driving force can be reduced in size.
The manufacturing cost can be reduced, and the power consumption during operation can be extremely reduced, which is economical.

On the other hand, in the present invention, unlike the conventional structure in which the valve element is directly moved by the attraction and repulsion of the permanent magnet and the electromagnetic coil, the operation of the pilot valve of the auxiliary valve causes
By making the two valve chambers having a pressure difference separated by the main valve and the valve seat conductive, the pressure difference in the plurality of flow paths is almost eliminated, and the pressing force of the main valve against the valve seat is greatly reduced. Since the main valve moves, it can be operated even when the pressure difference between the two valve chambers separated by the main valve and the valve seat is large before the operation of the electromagnetic coil, and the differential pressure operation performance can be sufficiently increased. .

Further, in the present invention, since the electromagnetic coil is disposed inside the permanent magnet, the inner case of the sealed valve case can be used for resin sealing for insulating the electromagnetic coil. For example, epoxy resin is used. Casting is possible, and a mold for resin sealing is not required, so that productivity is high and production can be performed at low cost. In addition, in order to reduce the leakage of the magnetic flux of the electromagnetic coil and the permanent magnet and obtain the same torque, the electromagnetic coil and the permanent magnet can be downsized, the power consumption can be reduced, and the whole can be produced compactly and at low cost. Therefore, when the directional control valve of the present invention is installed in an air conditioner or the like, the size of the device can be reduced, and the waiting time from defrosting the outdoor unit heat exchanger to returning to the heating operation during the heating operation can be reduced. You can also.

[Brief description of the drawings]

FIG. 1 is a side sectional view of one embodiment of a closed type directional control valve of the present invention.

FIG. 2 is a plan sectional view taken along the line AA in FIG.

FIG. 3 is a plan sectional view taken along a line BB in FIG. 1;

FIG. 4 is a side sectional view taken along the line CC in FIG. 3;

5 is an exploded view of parts of the sealed directional control valve of FIG. 1 before assembly.

FIG. 6 is a side sectional view of the main valve of FIG. 1;

FIG. 7 is a plan view as seen from the upper surface of FIG. 6;

FIG. 8 is a plan view seen from the bottom surface of FIG. 6;

FIG. 9 is a side sectional view of the rotor yoke of FIG. 1;

FIG. 10 is a plan view seen from the DD direction in FIG. 9;

11 is an enlarged plan view of the rotor yoke of FIG.

FIG. 12 is a plan view of the rotor yoke of FIG. 10 in a state before operation.

FIG. 13 is a plan view of the state of Operation 1 following FIG. 12;

FIG. 14 is a plan view of the state of Operation 2 following FIG. 13;

FIG. 15 is a plan view showing a state of the operation completion following FIG. 14;

FIG. 16 is a plan view seen from the lower surface in the EE direction of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sealing valve case 5 Valve seat 6 Permanent magnet 7 Main valve 9 Electromagnetic coil 13 Valve room 14 Valve room 15 Communication hole 24 Spring 27 Flow path 28 Flow path 29 Flow path 30 Flow path

Claims (2)

[Claims] 1. A closed valve case having a valve seat fixed to a lower end portion, a permanent magnet rotatably disposed inside the closed valve case, and a rotatably disposed and sealed inside the closed valve case. It comprises a main valve that generates a force that presses against a valve seat due to the pressure of fluid passing through a plurality of flow paths communicating with the valve case, and an electromagnetic coil that is located inside the permanent magnet and applies a rotational force to the permanent magnet, By providing a communication between the valve chamber formed by the main valve and the valve seat and the valve chamber in the sealed valve case, a communication hole for reducing the pressing force of the main valve against the valve seat is provided in the main valve, and the electromagnetic coil is provided. A closed-type directional control valve that opens and closes a communication hole by the rotation of. 2. The sealed directional control valve according to claim 1, further comprising a spring disposed between the rotor yoke and the main valve to bias the communication hole in a direction to close the communication hole.