JP2001193862A - Three-way valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a three-way valve capable of constituting a refrigeration system at a low cost and minimizing the power consumption. SOLUTION: This three-way valve comprises a cylindrical valve box 10 and a coil 24 installed to the circumference of the valve box. The valve box 10 is sealed by fixing an inlet pipe 12 to one end and a fixed iron core 14 to the other end, and a valve seat 21 having a flat surface having two conduits 22 and 23 opened therein is fixed to the vicinity of the inlet pipe 12 within the valve box. A first movable iron core 15 attracted by the fixed iron core 14 and a second movable iron core 16 attracted by the first movable iron core 15 are slidably provided between the valve seat 21 and the fixed iron core 14, and a first spring 17 and a second spring 18 are arranged between the fixed iron core 14 and the first movable iron core 15 and between the first movable iron core 15 and the second movable iron core 16, respectively. A valve element 13. which slides on the flat surface of the valve seat 21 to open and close the two conduits 22 and 23 is connected to the second movable iron core 16 through a connecting rod 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a three-way valve for switching the flow path of a refrigerant circuit. More specifically, the present invention relates to a three-way valve used for switching the flow path of a refrigerant circuit of a refrigerator having an evaporator in a freezing room, a refrigerator room, a vegetable room, and the like.

[0002]

2. Description of the Related Art A conventional three-way valve will be described with reference to FIG. FIG. 1 is a piping diagram of a refrigerator having evaporators C, D, and E respectively in a refrigerator compartment, a vegetable compartment, and a freezing compartment, for example, and is connected to the inlet pipe 2 connected to the outlet of the expansion valve F and the evaporator C. And a valve body 1 provided with an outlet pipe 3 and a valve seat 4, and a movable iron core 5 having a coil 6 mounted on the outer periphery and opening and closing the valve seat 4. Is connected to the outlet of the expansion valve F, and the outlet pipe 3 is connected to evaporators C and D, respectively.

[0003] In the above configuration, a refrigerant circuit for returning the refrigerant discharged from the compressor A to the condenser B → the expansion valve F → the evaporators C, D, E → the compressor A is formed. Coil 6 according to each required quantity of evaporator D of vegetable room
And the solenoid valve V is opened to supply the refrigerant.

[0004]

However, in the conventional three-way valve having the above-described structure, it is necessary to use two solenoid valves in the refrigerant circuit, which results in an expensive system. It is necessary to continue supplying power to the coil of the solenoid valve, and this is an uneconomical system requiring large power consumption.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to realize a three-way valve which can be configured at a low cost and has low power consumption.

[0006]

A three-way valve according to the present invention comprises a cylindrical valve box 10 and a coil 24 mounted on the outer periphery of the valve box 10, and the valve box 10 has one end. An inlet tube 12 is provided at the other end, and a fixed iron core 14 is fixedly sealed at the other end, and a valve having a flat surface in which two conduits 22 and 23 are opened near the inlet tube 12 inside the valve box 10. The seat 21 is fixed, and between the valve seat 21 and the fixed iron core 14, a first movable iron core 15 attracted to the fixed iron core 14 and a second movable iron core 16 attracted to the first movable iron core 15 are provided. A first spring 17 is provided between the fixed core 14 and the first movable core 15 so as to be slidable, and the first movable core 15 and the second movable core 1
The second movable iron core 16 is provided with a valve body 13 that slides on a plane of a valve seat 21 to open and close two conduits 22 and 23. Between the outer periphery of the second movable core 16 and the inner periphery of the valve box 10, disposed between the valve seat 21 and the first movable core 15, and provided on the valve seat 21 side. Magnetic tube 20 and magnetic tube 20
And a non-magnetic stopper 19 which is provided in series with the first movable core 15 and abuts on the first movable iron core 15, and controls the opening and closing of the two conduits 22 and 23 by energizing the coil 24.

[0007] In addition, the first movable iron core 1
Either the fifth movable core 16 or the second movable core 16 is a permanent magnet magnetized in the axial direction, and the biasing force applied by the first spring 17 to the first movable core 15 is such that the second spring 18 is driven by the second movable core 16. 16 is set larger than the urging force applied to the first movable core 15 and the attraction force of the permanent magnet when the first movable iron core 15 is attracted to the fixed iron core 14 and the second movable iron core 1.
6 is set to be larger than the urging force of the second spring 18 when it is attracted to the first movable iron core 15.

With this configuration, the operation of the first movable iron core and the operation of the second movable iron core are separately performed by utilizing the difference between the urging forces of the first spring and the second spring and changing the power supplied to the coil. The flow can be switched by one coil 24. In addition, each movable iron core 1
When the movable cores 5 and 16 or the movable core 15 and the fixed core 16 are in the attracted state, the attracted state can be maintained by the magnetic force of the permanent magnet, so that the coil is energized only when the movable core is operated. Good, so economical.

[0009]

1 is a diagram showing a refrigeration circuit using a three-way valve according to an embodiment of the present invention. As shown in the figure, the three-way valve of the present embodiment is incorporated as a circuit switching valve of a refrigeration circuit including a compressor A, a condenser B, evaporators C, D, E, and an expansion valve F. In the figure, reference numeral 10 denotes a valve box, and 24 denotes a coil mounted on the outer periphery of the valve box 10. The valve box 10 has a cylindrical shape, an inlet pipe 12 connected to the expansion valve F is provided at one end, and a fixed iron core 14 is fixed at the other end and is sealed. A valve seat 21 is fixed near the inner inlet pipe 12, and the valve seat 21 is connected to a conduit 22 connected to the evaporator C in the refrigerator compartment and a conduit 23 connected to the evaporator D in the vegetable compartment. Has an open plane.

Further, inside the valve box 10, a first movable core 15 and a second movable core 1 are provided between a valve seat 21 and a fixed core 14.
6 are slidably provided, a first spring 17 is disposed between the fixed iron core 14 and the first movable iron core 15, and a first spring 17 is provided between the first movable iron core 15 and the second movable iron core 16. Two springs 18 are provided. The first movable core 15 is magnetized in the axial direction by a permanent magnet, and the second movable core 16 is formed of a soft magnetic material.

Further, the biasing force applied by the first spring 17 to the first movable core 15 is set to be greater than the biasing force applied by the second spring 18 to the second movable core 16, and the attraction force of the first movable core is reduced. The urging force of the first spring 17 when attracted to the fixed core 14 and the urging force of the second spring 18 when the second iron core 16 is attracted to the first iron core 15 are set to be larger.

Further, the outer periphery of the second movable iron core 16 and the valve box 1
0, and between the valve seat 21 and the first movable iron core 15, and between the magnetic tube 20 and the magnetic tube 2 provided on the valve seat 21 side.
A non-magnetic stopper 19 is provided in series with the zero. Then, the movable core 15 abuts against the stopper 19 and the stop position in the direction of the valve seat 21 is regulated, and the first movable core 15 abuts on the valve seat 21 so that the stop position in the direction of the valve seat 21 is regulated. I have. A valve 13 is connected to the second movable iron core 16 through a connecting rod 11. The valve 13 slides on the plane of the valve seat 21 and the inlet pipe 12 and the two conduits 2.
2, 23 can be communicated or closed.

The operation of the embodiment of the present invention configured as described above will be described below. In FIG. 1, the coil 24 is non-conductive, the first movable iron core 15 contacts the stopper 19, and the second movable iron core 16 contacts the valve seat 21.
Therefore, the valve 13 closes the conduit 22. In this state, the refrigerant discharged from the compressor A branches off from the condenser B to the expansion valve F and returns to the compressor A via the evaporator E of the freezer. After passing through the evaporator D through the evaporator D, the refrigerant merges with the refrigerant discharged from the evaporator E and returns to the compressor A. Thereby, a refrigeration circuit of the freezer compartment and a refrigeration circuit of the vegetable compartment are formed.

Next, X in FIG. 3 showing the current flowing through the coil.
As shown by the arrow, the biasing force of the second spring 18 is
When a current that generates an attraction force smaller than the urging force of the spring 17 is applied to the coil 24, a magnetic field in the same direction as the magnetic field direction of the first movable core 15 is generated, and the first spring is larger than the urging force of the second spring 18. A traction force smaller than the urging force of the second movable iron core 17 is obtained, and as shown in FIG.
It is attracted to the first movable core 15 against the urging force of the spring 18. At this time, the first movable iron core 15 is not attracted to the fixed iron core 14 because the suction force received in the direction of the fixed iron core 14 is smaller than the urging force of the first spring 17. After that, even if the power supply to the coil 24 is stopped, the attraction force by the magnetic force of the second movable core 16 and the first movable core 15 exceeds the urging force of the second spring 18, so that the attraction state is maintained. In this state, the valve 13 closes both the conduits 22 and 23 to stop supplying the refrigerant to the evaporators C and D. Therefore, only the refrigeration circuit of the freezer is formed.

Next, as shown by Y in FIG.
When a current causing an attraction force larger than the urging force of the spring 17 is applied to the coil 24, a magnetic field in the same direction as the magnetic field direction of the first movable iron core 15 is generated, and a traction force larger than the urging force of the first spring 17 is obtained. As shown in FIG. 2 (b), the first movable core 15 and the second movable
It is sucked into 4. After that, even if the energization of the coil 24 is stopped, the attraction force by the magnetic force of the first movable iron core 15 and the fixed iron core 14 exceeds the urging force of the first spring 17, so that the attraction state is maintained. In this state, the valve 13 closes the conduit 23 and opens the conduit 22. Therefore the inlet pipe 12
And the conduit 22 are communicated with each other to supply the refrigerant to the evaporator C, thereby forming a refrigeration circuit of the refrigeration room.

Next, when a current in the negative direction indicated by Z in FIG. 3 is applied to the coil 24, a magnetic field in a direction opposite to the magnetic field direction of the first movable core 15 and canceling the magnetic field of the first movable core 15 is applied. And the attraction force between the first movable core 15 and the fixed core 14 and the attraction force between the second movable core 16 and the first movable core 15 disappear, and the first movable core 1
5 and the second movable core 16 are moved in the direction of the valve seat 21 by the urging forces of the first spring 17 and the second spring 18, respectively, the first movable core 15 abuts the stopper 19, and the second movable core 16
Returns to the position in contact with the valve seat 21. Thereafter, even if the energization of the coil 24 is stopped, this state is maintained and the state of FIG. 1 is maintained.

Further, from the state shown in FIG.
When a current is applied to the coil 24 so as to generate a magnetic field in the same direction as that of the magnetic field 5 and obtain a traction force greater than the urging force of the first spring 17, the first movable core 15 and the second movable core 16
Needless to say, simultaneously move in the direction of the fixed iron core 14 and each of them moves into the adsorbed state.

In the above-described embodiment, of the first movable iron core 15 and the second movable iron core 16, the first movable iron core 15 is a permanent magnet. However, the first movable iron core 15 is made of a soft magnetic material. Even when the second movable iron core 16 is a permanent magnet as a body, the same operation as in the above embodiment can be performed.

[0019]

According to the three-way valve of the present invention, the operation of the two movable iron cores can be controlled by changing the energized state of one coil using one valve body, and the flow path can be switched. It is possible, and it is not necessary to supply power to the coil except during the operation of the movable iron core. Therefore, a simplified refrigeration system that is excellent in economic efficiency can be configured at low cost.

[Brief description of the drawings]

FIG. 1 is a diagram showing a refrigeration circuit using a three-way valve according to an embodiment of the present invention.

FIGS. 2A and 2B are diagrams for explaining the operation of the three-way valve according to the embodiment of the present invention, wherein FIG. 2A shows a state in which a second movable core is attracted to a first movable core, and FIG. FIG. 1 is a diagram showing a state in which a second movable iron core is attracted.

FIG. 3 is a diagram showing a current supplied to a coil of a three-way valve according to the embodiment of the present invention.

FIG. 4 is a diagram showing piping of a refrigerator having three conventional evaporators.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Valve box 11 ... Connection rod 12 ... Inlet pipe 13 ... Valve body 14 ... Fixed iron core 15 ... 1st movable iron core 16 ... 2nd movable iron core 17 ... 1st spring 18 ... 2nd spring 19 ... Stopper 20 ... Magnetic tube 21 ... Valve seats 22,23 ... Conduit 24 ... Coil A ... Compressor B ... Condenser C ... Refrigerator evaporator D ... Vegetable room evaporator E ... Freezer evaporator F ... Expansion valve

Continued on the front page F term (reference) 3H067 AA15 CC32 CC46 DD05 DD32 ED20 FF17 GG02 GG12 GG23 GG24 3H106 DA08 DA23 DA27 DB02 DB12 DB23 DB32 DC12 DC18 DD03 EE25 EE34 FA01 FA07 GA15 GA23 GC02 KK23 KK34

Claims (2)

[Claims] 1. A cylindrical valve box (10) and said valve box (1).
0) a coil (24) mounted on the outer periphery of the valve box (10), wherein the valve box (10) is provided with an inlet pipe (12) at one end,
At the other end, a fixed iron core (14) is fixed and hermetically sealed, and inside the valve box (10) is located near the inlet pipe (12).
A valve seat (21) having a flat surface in which the conduits (22, 23) are opened is fixed, and the valve seat (21) and a fixed core (1) are fixed.
The first movable iron core (15) attracted to the fixed iron core (14) and the second movable iron core (16) attracted to the first movable iron core (15) are slidable between the first movable iron core (15) and the second movable iron core (16). A first spring (17) is provided between the fixed iron core (14) and the first movable iron core (15), and is provided between the first movable iron core (15) and the second movable iron core (16). A second spring (18) is provided, and a valve body (13) that slides on a plane of a valve seat (21) to open and close two conduits (22, 23) on the second movable iron core (16).
Are connected via a connecting rod (11), and a valve seat (21) and a first movable core (15) are provided between the outer periphery of the second movable core (16) and the inner periphery of the valve box (10). And a magnetic tube (2) provided at the valve seat (21) side.
0) and a stopper (19) of a non-magnetic material, which comes in contact with the first movable iron core (15) provided in series with the magnetic tube (20), is provided. A three-way valve for controlling the opening and closing of the conduits (22, 23). 2. One of the first movable iron core (15) and the second movable iron core (16) is a permanent magnet magnetized in the axial direction, and the first spring (17) is a first movable iron core. The biasing force applied to (15) is set to be greater than the biasing force applied by the second spring (18) to the second movable iron core (16),
In addition, the urging force of the first spring (17) and the second movable iron core (16) when the first movable iron core (15) is attracted to the fixed iron core (14) are applied to the first movable iron core (15). 2. The three-way valve according to claim 1, wherein the biasing force of the second spring is set to be larger than the urging force when the second spring is attracted.