JP2001193851A - Elector valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a selector valve capable of constituting a refrigeration system at a low cost and minimizing the power consumption. SOLUTION: This selector valve is provided with a valve box 10 and two tubes 11 and 11'. The valve box 10 comprises a valve chamber 13 having two right and left valve seats 12 and 12', one inlet pipe 14 communicating with the valve chamber 13, and two conduits 15 and 15'. Two valve elements 16 and 16' for opening and closing the valve seats 12 and 12', respectively, are arranged within the valve chamber 13, and projections 16a are formed on the valve element 16 and 16' through the valve seats 12 and 12', respectively. The tubes 11 and 11' comprise fixed iron cores 18 and 18', permanent magnets 19 and 19' adjacent thereto, and movable iron cores 21 and 21' provided on the permanent magnets 19 and 19' through springs 20 and 20', respectively. The movable iron cores 21 and 21' are in contact with the respective projections 16a of the valve elements 16 and 16', and a coil 22 is provided on one of the two tubes 11 and 11'.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a switching valve for switching a flow path of a refrigerant circuit. More specifically, the present invention relates to a switching valve used for switching a 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 switching valve will be described. FIG.
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 an inlet pipe 2 connected to an outlet of an expansion valve F and an outlet connected to the evaporator C. Two solenoid valves V each including a pipe 3 and a valve body 1 provided with 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 are arranged. The pipe 2 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, the refrigerant discharged from the compressor A forms a refrigeration circuit that returns to the condenser B → the expansion valve F → the evaporators C, D, E → the compressor A, and the evaporators C and D
The coil 6 is energized according to the required amount of
To supply the refrigerant.

[0004]

However, in the conventional switching 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 been refrigerated.
It is an object of the present invention to realize a switching valve that can configure a refrigeration system at low cost and consumes less power.

[0006]

According to the present invention, there is provided a switching valve comprising: a valve box; and two tubes provided on both right and left sides of the valve box. The valve box 10 includes a valve chamber 13 having two valve seats 12, 12 ′ on the left and right, one inlet pipe 14 communicating with the valve chamber 13, and the inlet pipe 14 and each valve seat 12, 12 ′. Two conduits 15, 15 ′ are provided sandwiching the valve chamber 13, and inside the valve chamber 13,
Two valve bodies 1 for opening and closing the respective valve seats 12, 12 '
A valve spring 17 for urging the 6, 6 'to separate from each other
, And each valve element 16, 16 ′ has a valve seat 1.
2 and 12 ', a projection 16a is formed. Each of the tubes 11, 11' has a fixed iron core 18, 1 at its end.
8 'and the permanent magnet 1 in contact with the fixed iron cores 18, 18'.
9, 19 'and the permanent magnets 19, 19'
The movable iron cores 21 and 21 'are provided on both sides of the movable cores 21 and 21'.
Each of the two tubes 11, 11 ′ is provided with a coil 22.

In addition, an outer yoke 23 for connecting the outer ends of the two tubes 11, 11 'to each other.
And an inner yoke 24 for connecting the inner ends of the two tubes 11, 11 'to each other.

[0008] In addition, the permanent magnets 19,
The urging force applied to the movable cores 21 and 21 ′ by the springs 20 and 20 ′ disposed between the movable core 19 and the movable cores 21 and 21 ′ is set so that one of them is set to be larger than the other, and the permanent magnet 19 , 19 ′ has an attraction force for attracting the movable iron cores 21, 21 ′.
1 and 21 '.

By adopting this configuration, the opening and closing of the two valve seats is controlled by giving a difference in the urging force of the spring for urging the two movable iron cores, and by changing the direction and magnitude of the energization to the coil. Besides making it possible, it is not necessary to energize the coil except during the operation of the movable iron core, so that a small and inexpensive switching valve can be obtained.

[0010]

FIG. 1 is a view showing a refrigeration circuit using a switching valve according to an embodiment of the present invention. The switching 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, as shown in FIG. In the figure, reference numeral 10 denotes a valve box. The valve box 10 has a cylindrical shape, and has a first tube 11 at one end and a second tube 1 at the other end.
1 'is provided inside the first and second valve seats 1 on the left and right.
A valve chamber 13 having 2, 12 'is formed. Also,
The valve box 10 has one inlet pipe 14 communicating with the valve chamber 13, and first and second conduits 15 and 15 ′ with the inlet pipe 14 sandwiching the first and second valve seats 12 and 12 ′, respectively. Is provided.

The first and second valve bodies 1 for opening and closing the first and second valve seats 12 and 12 'are provided inside the valve chamber 13.
A valve spring 17 for urging the 6, 6 'to separate from each other
The valve bodies 16 and 16 ′ are urged by valve springs 17 in the direction of sitting on the first and second valve seats 12 and 12 ′, respectively. Further, a projection 16a is formed on each of the valve bodies 16, 16 'so as to penetrate the first and second valve seats 12, 12', respectively.

Also, the first and second tubes 11, 1
1 ′, first and second fixed cores 18, 18 ′, from the end farther than the valve box 10 toward the closer,
First and second permanent magnets 19, 19 'in contact with 18', and first and second springs 20,
First and second movable iron cores 21 and 21 'are provided on both sides of 20'. And the first and second movable iron cores 2
1, 21 'are in contact with the projections 16a of the valve bodies 16, 16' described above. Further, the first of the two tubes
The tube 22 is provided with a coil 22.

Also, the first and second tubes 11, 1
1 'is provided with an outer yoke 23 that connects the outer ends thereof to form a magnetic path, and an inner yoke 24 that connects the inner ends thereof to form a magnetic path.

The first and second permanent magnets 19, 1
The first and second springs 20 and 20 ′ arranged between the movable core 9 ′ and the first and second movable cores 21 and 21 ′
Either one of the urging forces applied to the first and second permanent magnets 19 and 21 'is set to be larger than the other (the second spring 20' is larger in this embodiment). , 19 'are the first and second movable iron cores 21, 21'.
The first and the second springs 20 and 2
0 'is set larger than the urging force applied to the first and second movable iron cores 21 and 21'. Further, the urging force of the first and second springs 20, 20 'is set to be larger than the urging force of the valve spring 17, which urges the valve bodies 16, 16' in a direction away from each other.

The operation of the embodiment of the present invention thus configured will be described below. FIG. 1 shows a state in which the coil 22 is not electrically connected, and the first and second valve bodies 16 and 16 ′ are pressed by the first and second springs 20 and 20 ′. The second valve seat 12, 12 'is separated from the first,
The second valve seats 12, 12 'are open. Therefore, the refrigerant discharged from the compressor A returns to the compressor A through the evaporator E of the freezer branched through the condenser B → the expansion valve F, and the inlet pipe branched through the expansion valve F. 14 and is divided into left and right first conduit 15 → evaporator C and second conduit 1
A circuit for returning to the compressor A through 5 ′ → D is formed, and the refrigerant is supplied to all the evaporators C, D, and E.

Next, as shown in FIG.
In the same direction as the magnetic pole direction of the second permanent magnets 19, 19 ',
In addition, current is supplied so as to obtain an attraction force larger than the urging force of the first spring 20 and smaller than the urging force of the second spring 20 '. Then, the second movable core 21 ′ does not move, but the first movable core 21 operates in the direction of the first permanent magnet 19 and is attracted to the first permanent magnet 19. As a result, the first valve body 16 closes the first valve seat 12 to cut off the communication between the inlet pipe 14 and the first conduit 15 and stops the supply of the refrigerant to the evaporator C.

Also, as shown in FIG.
In the same direction as the magnetic pole direction of the second permanent magnets 19, 19 ',
When a current is applied so that an attraction force greater than the urging force of the second spring 20 'is obtained, the second movable iron core 21' operates in the direction of the second permanent magnet 19 'to operate the second permanent magnet 1'.
The first movable iron core 21 is also attracted by the first permanent magnet 19. As a result, the second valve body 16 'closes the second valve seat 12', interrupts the communication between the inlet pipe 14 and the second conduit 15 ', and stops the supply of the refrigerant to the evaporator D. Further, the first valve body 16 also closes the first valve seat 12, and the first pipe 16 is
And the supply of the refrigerant to the evaporator C is stopped.

The first and second movable iron cores 21, 21 '
Is attracted to the first and second permanent magnets 19 and 19 ', the attraction force of the first and second permanent magnets 19 and 19' increases the urging force of the first and second springs 20 and 20 '. Since it is set to be larger, the attracted state is maintained even when the power supply to the coil 22 is stopped.

Next, the coil 22 has a direction opposite to the magnetic pole direction of the first and second permanent magnets 19 and 19 'and is larger than the biasing force of the second spring 20' and smaller than the biasing force of the first spring 20. When a current is applied to obtain a repulsive force, the second movable iron core 21 'operates in the direction of the second valve seat 12', whereby the second valve body 16 'opens the second valve seat 12' to open the inlet. The pipe 14 communicates with the second conduit 15 ', and the evaporator D
Supply of refrigerant to the

Further, the first spring 20 is mounted on the coil 22 in the direction of the magnetic poles of the first and second permanent magnets 19 and 19 '.
When current is supplied so as to obtain a repulsive force larger than the urging force of the first movable iron core 21, the first movable iron core 21 operates in the direction of the first valve seat 12,
Accordingly, the first valve body 16 opens the first valve seat 12 and connects the inlet pipe 14 and the first conduit 15 to enable the supply of the refrigerant to the evaporator C. At this time, when the coil 22 is energized, the first and second movable iron cores 21 and 21 ′ are turned on by the first and second permanent magnets 1.
It only needs to be removed from 9,19 '.

It should be noted that the coil 22 is initially energized in the same direction as the magnetic poles of the first and second permanent magnets 19 and 19 'so that an attractive force greater than the urging force of the second spring 20' is obtained. When energized, the first and second movable iron cores 21,
21 'operates in the direction of the first and second permanent magnets 19, 19', respectively, and is attracted to the first and second permanent magnets 19, 19 ', and the first and second valve seats 12, 12'. Are closed at the same time. In a state where the first and second movable iron cores 21 and 21 ′ are attracted to the first and second permanent magnets 19 and 19 ′, the first and second permanent magnets 19 and 19 ′ are attached to the coil 22. When the current is supplied in a direction opposite to the magnetic pole of the first spring 20 and a repulsive force greater than the urging force of the first spring 20 is obtained, the first and second current
Of the movable iron cores 21 and 21 ′ are the first and second valve seats 1, respectively.
2, 12 'in the direction of the first and second valve seats 12, 1
Needless to say, 2 'is opened simultaneously.

[0022]

According to the switching valve of the present invention, one coil, two permanent magnets, and two movable iron cores are used, and a difference is exerted on the biasing force of the spring that biases the two movable iron cores. By changing the direction and size of energization to the coil, it is possible to open and close the two valve seats, and to stop energization of the coil except when the movable iron core is operating. Can be provided.

[Brief description of the drawings]

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

FIG. 2 is a diagram for explaining the operation of the switching valve according to the embodiment of the present invention.

FIG. 3 is a diagram for explaining the operation of the switching 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 ... 1st tube 11 '... 2nd tube 12 ... 1st valve seat 12' ... 2nd valve seat 13 ... Valve chamber 14 ... Inlet pipe 15 ... 1st conduit 15 '... 1st 2 conduit 16 16 first valve element 16 ′ second valve element 17 valve spring 18 first fixed iron core 18 ′ second fixed iron core 19 first permanent magnet 19 ′ second Permanent magnet 20 First spring 20 'Second spring 21 Second movable iron core 21' First movable iron core 22 Coil 23 Outer yoke 24 Inner yoke A Compressor B Condenser C ... Evaporator in refrigerator compartment D ... Evaporator in vegetable compartment E ... Evaporator in freezer compartment F ... Expansion valve

Continued on front page F term (reference) 3H067 AA22 AA32 BB02 CC32 DD05 DD13 DD32 EA15 EA26 FF18 GG02 GG12 GG24 3H106 DA07 DA25 DA26 DB02 DB12 DB22 DB32 DB37 DC08 DC18 DD03 EE34

Claims (3)

[Claims] 1. A valve box (10) and two tubes (11, 1) provided on both left and right sides of the valve box (10).
1 ′), and the valve box (10) has two valve seats (12, 1) on the left and right.
2 '), one inlet pipe (14) leading to the valve chamber (13), and two pipes (12, 12') sandwiching the inlet pipe (14) and the valve seats (12, 12 ') respectively. Two conduits (15,1
5 ') is provided, and two valve bodies (16, 16') for opening and closing the respective valve seats (12, 12 ') are biased in the valve chamber (13) in a direction away from each other. The spring (17) is interposed therebetween, and each valve element (16, 16 ') has a valve seat (12, 1).
2 '), a projection (16a) is formed. Each of the tubes (11, 11') has a fixed core (18, 18 ') at an end and a fixed core (18, 18'). In contact with the permanent magnet (19, 19 ') and the permanent magnet (1).
9, 19 ') are provided with movable iron cores (21, 21') with springs (20, 20 ') interposed therebetween, and the movable iron cores (21, 21') are provided on the respective valve elements (16, 16 '). The projections (16a) are in contact with each other, and one of the two tubes (11, 11 ')
A switching valve, characterized in that one (11) is provided with a coil (22). 2. An outer yoke (23) connecting the outer ends of the two tubes (11, 11 ') and an inner yoke (24) connecting the inner ends of the two tubes (11, 11'). 2. The switching valve according to claim 1, further comprising: 3. A spring (2) disposed between said permanent magnet (19, 19 ') and a movable core (21, 21').
0, 20 ') to the movable core (21, 21') is set to be greater than that of the other, and the permanent magnets (19, 19 ') are used by the movable core (21, 21').
1 ') is a spring (20, 20')
The switching valve according to claim 1, characterized in that the pressure is set to be larger than the biasing force applied to the movable iron core (21, 21 ').