JPS6222975A - Electric expansion valve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electric expansion valve for a refrigeration cycle that requires changing the flow rate of refrigerant.

2. Description of the Related Art Conventionally, this type of electric expansion valve has had a structure as shown in FIG. In Fig. 2, reference numeral 11 denotes a body, and there is a male threaded part 17 above the center part, a through hole 11a is provided in the center of the male threaded part 17, and an outlet pipe 14 is brazed to the lower end of this through hole 11a. has been done. Further, there is a communication hole 1b which communicates with the through hole 11a in a right angle direction and penetrates to the outer periphery, and an inlet pipe 13 is brazed to the outer periphery end of this communication hole 1b. Further, a part of the through hole 11a becomes a port 12 for adjusting the flow rate of fluid. A female threaded portion 18 is screwed into the male threaded portion 17, and this female threaded portion 18 is connected to the magnet 1.
9, and this magnet 19 has a through hole 1 in the center.
9a, and the magnet 19 has a cylindrical outer shape and has a north pole magnetized on a part of its outer periphery, and a south pole magnetized on the opposing position. A shaft 15 passes through the through hole 19a, and a needle 16 is machined at one end of the shaft. The other end has a flange portion 15a with a large outer diameter, and the intermediate portion has a stepped portion 15b, and a spring 2o is provided between the stepped portion 15b and the magnet 19. Therefore, the shaft 15 is in the same position relative to the magnet 19. In addition, the guide tube 2 is made of steel and has a very small gap between it and the outer periphery of the magnet 19.
1 is soldered to the body 11. Further, a coil 22 is attached to the outside of this guide tube 21, and this coil 22 uses electricity to create north and south poles on its inner surface, and these north and south poles rotate at equal angular pitches. The magnet 19 is attracted by the rotation of the north and south poles by the coil 22 and rotates. The rotation of the magnet 19 changes to vertical movement due to the male threaded portion 1 and the female threaded portion 18, and as the magnet 19 moves in the vertical direction, the shaft 15 also moves up and down, so that the needle 6 occupies the inner diameter of the port 12. changes, and the flow resistance changes.

As a result, the flow rate of the refrigerant can also be changed.

Problems to be Solved by the Invention In such a conventional configuration, the amount of pressure reduction can be varied in many cases, but the internal structure becomes complicated and the cost increases. In addition, in a multi-air conditioner, switching between one unit operation and two unit operation requires only two types of changes in the amount of decompression, and the purpose is to simplify the control software associated with changes in the amount of decompression, simplify the functions of the main unit, and reduce costs. That is.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a hollow part formed by a body and a guide tube to which an inlet pipe and an outlet pipe are attached, which is integrated with or engaged with an aspirator. A plunger is slidably provided, and adjustment holes with different inner diameters are formed in the plunger to enable communication between an inlet pipe and an outlet pipe,
The adjustment hole that connects the inlet pipe and the outlet pipe can be selected by sliding a plunger using a coil formed on the outer periphery of the guide tube.

Function: With this configuration, by energizing the mimagnetic coil, the plunger is attracted upward and the adjustment hole formed in the plunger can be switched, and the flow rate from the inlet pipe to the outlet pipe can be adjusted.

Example An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, 1 is a cylindrical body with two holes penetrating the sides at right angles to a hole in the center, and an inlet pipe 2. An outlet pipe 3 is brazed to the outside of the body 1. A cylindrical guide tube 4 is brazed into a circular hole in the center of the body 1, and an aspirator 5 is placed in a cylindrical cavity inside the guide tube 4.
is soldered. A plunger 6 is inserted between the body 1 and the guide tube 4, leaving a very small gap, and an O-ring 9 is inserted in the groove of the plunger 6 between this very small gap. There is. The upper part of this plunger 9 is flat, and there is a small recess in the center of this flat surface, and a spring end is inserted between this small recess and the suction element 6, and this spring 7 causes the plunger to The jar 6 is pressed against the body 1 side. The lower part of the plunger 6 has an inverted conical shape, and the apex of this inverted conical shape is a small flat surface. A center hole 6a is placed inwardly in the center of this small plane, and this center hole 6a
There are three through holes that communicate with each other and are perpendicular to each other. Two of them have adjustment holes 6b with different inner diameters that can face the inlet pipe.
One is a communication hole 6C facing the outlet pipe 3.

An electromagnetic coil 8 is attached to cover the guide tube 4, and when the electromagnetic coil 8 is energized, the plunger 6 is attracted upward, thereby adjusting the adjustment hole 6b facing the inlet pipe 2. It is possible to switch the refrigerant flow rate to 2
It can be changed in stages.

Effects of the Invention As described above, the present invention has the advantage that the internal structure of the electric expansion valve can be simplified, the cost can be reduced, and the control software can also be simplified.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an electric expansion valve according to an embodiment of the present invention, and Fig. 2 is a cross-sectional view of a conventional electric expansion valve.
...Body, 2...Inlet pipe, 3...
...Outlet pipe, 4...Guide tube, 5...
...Attractor, 6...Plunger, 6a...
...Center hole, 6b...Adjustment hole, 6C...
...Communication hole, 7...Spring, 8...
...Electromagnetic coil, 9...O ring.

Claims (1)

[Claims] An inlet pipe and an outlet pipe communicating with the inside of the body are connected to the side surface of the cylindrical body, and suction is drawn into the approximately cylindrical hollow space formed by the body and the cylindrical guide tube that covers the body opening. A plunger integrated with or engaged with the guide tube is slidably provided, and the plunger is provided with a plurality of adjustment holes having different inner diameters to enable communication between the inlet pipe and the outlet pipe, and provided on the outer periphery of the guide tube. The electric expansion valve is configured such that the adjustment hole connecting the inlet pipe and the outlet pipe can be selected by sliding the attractor and the plunger using a coil.