CN-116981873-B - Valve device

CN116981873BCN 116981873 BCN116981873 BCN 116981873BCN-116981873-B

Abstract

A rotor of a valve device (10) includes a drive disk (22) and a lever (24) that is fixed to the drive disk and connects the drive disk and the shaft so as to be rotatable integrally with each other while allowing the drive disk to be displaced in the axial direction of the shaft. A first torsion spring (28) is disposed between the housing and the shaft, and a second torsion spring (30) is disposed between the shaft and the lever. The drive unit of the valve device includes a motor (161) that drives rotation in a first rotation direction axially toward the initial rotation position and in a second rotation direction opposite to the first rotation direction within a rotation drive range between the initial rotation position and the maximum rotation position. The first torsion spring biases the shaft toward the second rotational direction with respect to the housing in a state where the shaft is driven by the motor toward the first rotational direction while the shaft is located at the initial rotational position.

Inventors

MIZUNUMA TAKEHITO
SANO RYO

Assignees

株式会社电装

Dates

Publication Date: 20260512
Application Date: 20220329
Priority Date: 20210421

Claims (5)

1. A valve device, comprising: a housing having a fluid passage formed therein for fluid communication; a plate-shaped fixing plate fixed to the inner side of the housing and having at least one flow path hole for passing a fluid; A driving unit that outputs a rotational force; a shaft which rotates about a predetermined axis by the rotational force, and A rotor that increases or decreases the opening of the flow path hole in accordance with the rotation of the shaft, The rotor includes a plate-shaped drive disk that slides relative to the fixed disk, and a lever that is fixed to the drive disk and connects the drive disk and the shaft so as to be rotatable integrally with each other in a state in which the drive disk is displaceable in an axial direction of the shaft, A first torsion spring that urges the shaft in a circumferential direction around an axis of the shaft with respect to the housing is arranged between the housing and the shaft, A second torsion spring that urges the lever in the circumferential direction with respect to the shaft is disposed between the shaft and the lever, The driving section includes a motor that rotationally drives the axial direction in a first rotational direction toward the initial rotational position and in a second rotational direction opposite to the first rotational direction within a rotational driving range between the initial rotational position and a maximum rotational position, The first torsion spring biases the shaft toward the second rotational direction with respect to the housing in a state in which the shaft is driven toward the first rotational direction by the motor so that the shaft is located at the initial rotational position.
2. A valve device according to claim 1, wherein, The valve device includes a motor control unit for controlling the motor while grasping the position of the shaft with reference to the origin position, The initial rotation position is a position where rotation of the shaft is restricted by contact with a stopper provided in the housing, The motor control unit performs an initialization process of updating the origin position in a state where the shaft is rotated to the initial rotation position and is in contact with the stopper unit.
3. A valve device according to claim 2, wherein, The motor is a stepper motor and the motor is a stepper motor, The motor control unit determines whether or not the shaft is in a state of touching the stopper unit based on a counter electromotive force generated in a coil of the motor.
4. A valve device according to any one of claim 1 to 3, The shaft includes a metallic shaft portion including the shaft center and extending in the shaft center direction, and a resin bracket portion coupled to the shaft portion and receiving the urging force of the first torsion spring and the second torsion spring.
5. A valve device according to any one of claim 1 to 3, The shaft penetrates the fixed disk and the driving disk and is rotatably supported by the housing.

Description

Valve device Related application The present application was made based on japanese patent application No. 2021-071787, filed on 21 a 4 th 2021, and the contents of the description thereof are incorporated herein by reference. Technical Field The present disclosure relates to valve devices. Background As such a valve device, for example, a flow control valve described in patent document 1 is known. The flow control valve described in patent document 1 includes a valve body, a driving device that drives the valve body, a speed reducing device that is disposed between the valve body and the driving device to increase a driving torque of the driving device, and a return spring that biases the valve body driven via the speed reducing device. The valve body of the flow control valve has a disk and a shaft as rotors, and is configured such that the disk and the shaft are integrally rotatable in a state in which the disk is displaceable in an axial direction of the shaft. Prior art literature Patent literature Patent document 1 Japanese patent laid-open publication No. 2002-257248 Disclosure of Invention In a valve device such as the flow control valve of patent document 1, when a disk serving as a rotor is rotated by a drive device, the opening degree of a flow path hole through which fluid passes from an inlet to an outlet of a housing is increased or decreased. However, the flow control valve of patent document 1 does not take any countermeasure to suppress looseness in the circumferential direction between the disk as the rotor and the shaft, and therefore the opening degree of the flow path hole varies. The variation in the opening degree of the flow path hole is undesirable because it causes variation in the flow rate of the fluid passing through the valve device. This was found by the present inventors after a careful study. The purpose of the present disclosure is to provide a valve device that can suppress the variation in the opening degree of a flow path hole caused by loosening in the circumferential direction from a drive unit to a rotor. In accordance with one aspect of the present disclosure, The valve device is provided with: a housing having a fluid passage formed therein for fluid communication; A plate-shaped fixing plate fixed to the inner side of the housing and having at least one flow path hole for passing a fluid; A driving unit that outputs a rotational force; a shaft which rotates around a predetermined axis by a rotational force, and A rotor for increasing or decreasing the opening of the flow path hole with rotation of the shaft, The rotor includes a plate-shaped drive disk that slides relative to the fixed disk, and a lever that is fixed to the drive disk and connects the drive disk and the shaft so as to be rotatable integrally in a state in which the drive disk is displaceable in an axial direction of the shaft, A first torsion spring that biases the shaft in a circumferential direction around an axial center of the shaft with respect to the housing is arranged between the housing and the shaft, A second torsion spring is disposed between the shaft and the lever for urging the lever in a circumferential direction with respect to the shaft, The driving section includes a motor that rotationally drives a first rotational direction axially toward the initial rotational position and a second rotational direction opposite to the first rotational direction within a rotational driving range between the initial rotational position and the maximum rotational position, The first torsion spring biases the shaft toward the second rotational direction with respect to the housing in a state where the shaft is driven by the motor toward the first rotational direction so that the shaft is located at the initial rotational position. By applying a force to the shaft in the circumferential direction with respect to the housing by the first torsion spring in this manner, the looseness between the drive unit and the shaft in the circumferential direction can be suppressed. Further, if the lever is biased in the circumferential direction with respect to the shaft by the second torsion spring, looseness between the shaft and the lever in the circumferential direction can be suppressed. Further, since the lever is fixed to the drive disk, the second torsion spring can suppress looseness in the circumferential direction between the shaft and the drive disk. Accordingly, the play in the circumferential direction from the drive unit to the rotor is suppressed, and the variation in the opening degree of the flow passage hole due to the play can be suppressed. In particular, if the shaft is biased in the second rotational direction with respect to the housing in the state of being positioned at the initial rotational position, highly accurate position control of the shaft (i.e., opening degree control of the flow passage hole) starting from the initial rotational position can be performed. Further, the bracketed