JPH0325470Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] Numerous innovations have been made in the refrigerant circuits of electric refrigerators, etc. to achieve high functionality through advanced control and to save energy. being done.

The present invention is used for such purposes, especially when it is desired to drive the compressor in the refrigerant circuit with an inverter motor to significantly change the rotation speed and widen the range of change in cooling capacity. This invention relates to an electric multi-way valve that takes advantage of its features.

[Conventional technology]

The applicant of the present application has applied for an electric multi-way valve as shown in FIG. 5 in Utility Application No. 24308/1983.
This electric multi-way valve has multiple valve ports, , on the same cross section of the outer cylinder, arranged at equal or double angles, and a valve closing element, , on the same cross section of the inner shaft, for the valve ports, , . Correspondingly, the valve closing elements are provided at equal or double angles, each of which is pressed by a spring toward the valve opening, and one end of the inner shaft is integrally attached to the rotor of the motor. Ta.

[Problem that the invention attempts to solve]

In this case, since the valve port is located on the inner circumferential surface of the outer cylinder, it is difficult to perform processing such as molding a valve seat on the valve port, and it is difficult to maintain airtightness when the valve is closed. moreover,
The length from the center of the inner shaft to the valve opening needs to be longer than a certain amount because it is necessary to insert a spring, and as a result, the resistance moment generated in the valve closing element increases, making it necessary to increase the motor torque. Ta. Additionally, when inserting the inner shaft, a complicated jig was required, making it difficult to assemble.

[Means for solving problems]

In the present invention, a plurality of valve ports are provided on concentric circles on the lower surface of the outer cylinder at equal or double angles, and a valve closing element such as a steel ball is attached to the valve ports on the lower end surface of the inner shaft. Correspondingly provided, the valve closing element,
The inner shaft is loaded into the outer cylinder so that the inner shaft is pressed by a spring toward the valve opening, and the upper end of the inner shaft is integrally attached to the rotor of the motor, thereby improving airtightness when the valve is closed. This is intended to reduce the moment of resistance generated in the valve closing element and to improve ease of assembly.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3 based on the drawings. A plurality of valve ports are arranged concentrically on the lower surface of the outer cylinder.
are set every 90° within a 180° range of the semicircle,
At the lower end of the inner shaft, for example, a steel ball closure,
is provided corresponding to the valve opening, , the valve closing element, , is pressed by a spring toward the valve opening, , and a rotor of a motor is integrally attached to the upper end of the inner shaft. It is a valve.

The motor consists of a rotor and a stator. For example, a non-magnetic stainless thin-walled cylinder with a bottom is interposed between the rotor and the stator, and the outer cylinder and the cylinder with a bottom are hermetically connected by a method such as welding. The interior and exterior are completely separated.

The motor is, for example, a pulse motor,
In response to pulse instructions sent from a microcomputer (not shown), it rotates by an angle proportional to the number of pulses.

A positioning pin is provided on the outer cylinder to protrude inward, and the rotatable range of the inner shaft is regulated by the pin as shown in FIG.

That is, the tip of the pin is fitted into a substantially ring-shaped groove provided on the outer periphery of the inner shaft,
This groove restricts the axial movement and rotatable range of the inner shaft.

Also, the part shown on the top of the pin is a weld overlay to maintain airtightness, the part shown is the refrigerant inlet, and the part shown on the top of the pin is a ring-shaped protrusion extending in the circumferential direction of the inner shaft, and the part shown on the top of the pin is a ring-shaped protrusion that extends in the circumferential direction of the inner shaft. This is to prevent wobbling.

[Operation of the present invention]

FIG. 4 shows the operation of the electric multi-way valve of the present invention, and in the state (A), the valve ports, , are closed by the valve closing pieces, , respectively. Note that at this time, the positioning pin is at the starting end of the groove.

In state (b), the valve opening is the valve closing button, respectively.
The valve is closed and only the valve port is open.

In state (c), the valve opening is the valve closing button, respectively.
The valve is closed and only the valve port is open.

In state (d), the valve opening is the valve closing button, respectively.
The valve is closed and only the valve port is open.
The locating pin is now at the end of the groove.

In state (e), all valve ports, , are open.

By rotating the inner shaft in five ways (A) to (E) in this way, the opening and closing states of the valve ports can be changed.

If the valve closing element is a steel ball, the valve is closed by strongly pressing a steel ball made of carbide or the like with the same diameter as the steel ball against each valve opening to form a valve seat. The amount of valve leakage can be kept to a minimum. In addition, the moment of resistance generated in the valve closing element is expressed as the product of the distance from the center of the inner shaft to the steel ball, the load applied to the valve closing element (spring load, fluid suction load, etc.), and the resistance coefficient. , the distance at this time can be minimized, and the moment of resistance becomes small, so the torque of the motor can be reduced. In addition, the ease of assembling the inner shaft and outer cylinder is
Since the mounting direction of the valve closing element and the spring is the same as the insertion direction, it can be assembled without a complicated assembly jig or the like.

[Effects of this invention]

In the present invention, as is clear from the above explanation, by arranging the valve port on a concentric circle on the lower surface of the outer cylinder, processing such as molding the valve seat can be easily performed on the valve port.
Valve leakage can be minimized. Moreover, since the distance from the center of the inner shaft to the valve opening can be reduced, the moment of resistance is reduced, and therefore the torque of the motor is reduced, allowing the motor to be made smaller. Furthermore, since the mounting direction of the valve closing element and the spring is the same as the insertion direction of the inner shaft, assembly work is also facilitated.

As described above, the present invention can provide extremely useful value in industry.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional view of the electric multi-way valve of the present invention, Figure 2
The figure is a sectional view taken along line A-A in Figure 1, and Figure 3 is B in Figure 1.
-B sectional view, FIG. 4 is a sectional view illustrating relative movement between the valve port and the valve closing element, and FIG. 5 is a longitudinal sectional view of a conventional electric multi-way valve. ...Outer cylinder, ... Valve port, ... Inner shaft, ... Valve closure, ... Spring, ...
Pulse motor, ... rotor, ... stator,
...thin-walled bottomed tube, ...positioning pin, ...
Groove on the inner shaft, ... refrigerant inlet, ... ring-shaped protrusion, ... electric multi-way valve.

Claims (1)

[Scope of claims for utility model registration] 1. Multiple valve ports on concentric circles on the lower surface of the outer cylinder,
are provided at equal angles or double angles, and a valve closing element, , is provided on the lower end surface of the inner shaft, and a valve opening, , is provided on the lower end surface of the inner shaft.
The inner shaft is installed in the outer cylinder so that the valve closing elements, , are pressed toward the valve opening, , by springs, and the upper end of the inner shaft is integrally attached to the rotor of the motor. Electric multi-way valve. 2 A positioning pin is provided on the outer cylinder to protrude inward, and the tip of the pin is slidably fitted into a groove formed on the inner shaft that regulates the range of axial movement and rotation. An electric multi-way valve according to claim 1 of a certain utility model registration claim.