JP2017223263A5 - - Google Patents

Description

Conventionally, an electric valve used for a package air conditioner, a room air conditioner, a refrigerator, and the like is known (for example, Patent Document 1). In this electric valve, as shown in FIG. 7, when the stepping motor is driven and the rotor 103 rotates, the valve element 114 is moved in the axis L direction via the moving shaft 102 by the screw feeding action of the female screw 131a and the male screw 121a. Moving. Thereby, adjustment which opens and closes the valve body 114 is made, and the flow rate of the refrigerant flowing in from the pipe joint 111 and flowing out from the pipe joint 112 is controlled.

In this motor-operated valve, a slight gap 123 is formed between the valve port 121 and the valve body 114 as shown in FIG. 8 even when the valve body 114 is moved to the maximum in the valve closing direction . At this time, the valve is designed to be in the minimum valve open state. Therefore, even at the minimum valve open state, is allowed fluid to flow slightly through the gap 123, it is possible to ensure the flow rate to follow the low frequency operation of the compressor. Further, since the refrigerant can always circulate in the refrigeration cycle, the compressor can be prevented from being burned out.

To achieve the above object, the motor-operated valve of the present invention is
This is an electric valve that converts the rotational motion of the rotor into a linear motion by screwing the male screw member and the female screw member, and moves the valve element accommodated in the valve body in the axial direction based on this linear motion. And
An insensitive portion that forms a minute clearance with the inner peripheral surface of the valve port when the valve body is inserted into the valve port ;
A tip portion having a tapered outer peripheral surface formed continuously with the insensitive portion, and
A height of the insensitive portion inserted into the valve port is formed to be higher than a height of a screw play at the time of the screwing.

As a result, the difference in flow rate between when the fluid is passed in the forward direction and when the fluid is passed in the reverse direction in the minimum valve open state can be eliminated, and the problem of energy saving can be solved.
Moreover, the motor operated valve of the present invention is
The valve body is made of stainless steel or brass.
Moreover, the motor operated valve of the present invention is
A support member fixed to the valve body and functioning as the female screw member;
A male screw shaft fixed to the rotor and functioning as the male screw member;
With
The valve body is held by the male screw shaft in a state of being biased in the direction of a valve seat member disposed in the valve body.

A case 61 of a stepping motor (not shown) is airtightly fixed to the upper end of the valve body 1 by welding or the like. In the case 61, a magnet rotor 62 whose outer peripheral portion is magnetized in multiple poles is rotatably provided. A stator coil (not shown) is disposed on the outer periphery of the case 61, and the stepping motor rotates the magnet rotor 62 according to the number of pulses when a pulse signal is given to the stator coil. The magnet rotor 62 has a fitting hole 62a and a rotation stopper (not shown). Then, the fitting hole 62a is fitted into the large-diameter portion 41 of the male screw shaft 4, the rotation stopper is engaged with the notch portion of the flange portion 41b of the male screw shaft 4, and the spring bracket 45 is further made large-diameter. The magnet rotor 62 is fixed to the male screw shaft 4 by being press-fitted into the end of the portion 41 and welded.

Claims (5)

This is an electric valve that converts the rotational motion of the rotor into a linear motion by screwing the male screw member and the female screw member, and moves the valve element accommodated in the valve body in the axial direction based on this linear motion. And
The valve body, when inserted into a valve port, an insensitive portion that forms a minute clearance with the inner peripheral surface of the valve port ;
A tip portion having a tapered outer peripheral surface formed continuously with the insensitive portion, and
The motor-operated valve, wherein a height of the insensitive portion inserted into the valve port is formed to be higher than a height corresponding to a screw play at the time of screwing.   The motor-operated valve according to claim 1, wherein the outer peripheral surface of the insensitive portion and the inner peripheral surface of the valve port are substantially parallel.   The motor-operated valve according to claim 2, wherein the outer peripheral surface of the insensitive portion and the inner peripheral surface of the valve port are parallel to each other. The motor-operated valve according to any one of claims 1 to 3, wherein the valve body is made of stainless steel or brass. A support member fixed to the valve body and functioning as the female screw member;
A male screw shaft fixed to the rotor and functioning as the male screw member;
With
The said valve body is hold | maintained at the said male screw shaft in the state urged | biased in the direction of the valve seat member arrange | positioned at the said valve main body, The Claim 1 characterized by the above-mentioned. Motorized valve.

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