Refrigerant passage change-over valve and air conditioner using the same
First Claim
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1. A refrigerant passage change-over valve configured to switch a refrigerant passage in a refrigerant circuit, the valve comprising:
- a valve case including a plurality of ports;
a valve body configured to rotate in the valve case and slide on openings of predetermined ones of the ports to switch a communication state among the ports;
a motor configured to rotate the valve body; and
a controller configured to control a rotation speed of the motor in accordance with a differential pressure between internal and external pressures of the valve body, whereinthe controller is configured to control the rotation speed of the motor such that a first non-zero rotation speed with a first differential pressure is larger than a second non-zero rotation speed with a second differential pressure higher than the first differential pressure, andthe controller is configured to control the rotation speed of the motor to be constant at the first non-zero rotation speed or the second non-zero rotation speed during an entire switching operation of the valve body.
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Abstract
A valve case (11) includes a plurality of ports (P1, P2, P3, . . . ). A valve body (50) rotates in the valve case (11) and slide on openings of predetermined ones of the ports (P1, P2, P3, . . . ) to switch a communication state among the ports (P1, P2, P3, . . . ). A motor (31) rotates the valve body (50). A controller (500) controls a rotation speed (ω) of the motor (31) in accordance with a differential pressure (ΔP) between internal and external pressures of the valve body (50).
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Citations
8 Claims
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1. A refrigerant passage change-over valve configured to switch a refrigerant passage in a refrigerant circuit, the valve comprising:
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a valve case including a plurality of ports; a valve body configured to rotate in the valve case and slide on openings of predetermined ones of the ports to switch a communication state among the ports; a motor configured to rotate the valve body; and a controller configured to control a rotation speed of the motor in accordance with a differential pressure between internal and external pressures of the valve body, wherein the controller is configured to control the rotation speed of the motor such that a first non-zero rotation speed with a first differential pressure is larger than a second non-zero rotation speed with a second differential pressure higher than the first differential pressure, and the controller is configured to control the rotation speed of the motor to be constant at the first non-zero rotation speed or the second non-zero rotation speed during an entire switching operation of the valve body. - View Dependent Claims (3, 4)
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2. A refrigerant passage change-over valve configured to switch a refrigerant passage in a refrigerant circuit, the valve comprising:
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a valve case including a plurality of ports; a valve body configured to rotate in the valve case and slide on openings of predetermined ones of the ports to switch a communication state among the ports; a motor configured to rotate the valve body; and a controller configured to control a rotation speed of the motor in accordance with a differential pressure between internal and external pressures of the valve body, wherein the controller is configured to control the rotation speed of the motor such that a first non-zero rotation speed with a first differential pressure is larger than a second non-zero rotation speed with a second differential pressure higher than the first differential pressure, wherein the controller is configured to set the rotation speed to the first non-zero rotation speed or the second non-zero rotation speed for an entire switching operation at a start of switching of the valve body in accordance with the differential pressure. - View Dependent Claims (5, 6, 7, 8)
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Specification