Control Valve Damping Member for Variable-Displacement Compressor Noise Reduction
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Solution Overview
Problem
Control valves in variable-displacement compressors experience noise generation due to vibrations of the movable iron core colliding with the housing member, leading to noise radiation issues.
Innovation Solution
A control valve design incorporating a first damping member, such as a rubber sheet, between the housing member and the coil unit's end portion member to absorb vibrations and reduce collisions, thereby minimizing noise radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the movable iron core is driven by electromagnetic force with PWM control, then the valve opening degree can be adjusted, but the movable iron core vibrates and collides with the housing member, generating noise
Solution Approach 1:
A damping member is introduced as an intermediary element between the movable iron core and the housing member. This damping member absorbs the vibrations and collision forces, preventing direct contact between the iron core and housing member, thereby reducing noise while maintaining the PWM control functionality for valve opening adjustment.
Solution Approach 2:
The damping member is pre-installed between the movable iron core and the housing member to provide cushioning before collision occurs. This beforehand cushioning prevents the harmful collision and vibration transmission to the housing member, reducing noise generation during the operation of adjusting the valve opening degree.
2Reliability
If the movable iron core is guided in the housing member, then the valve body can be controlled to open and close the fluid passage, but vibration causes collision between the iron core and housing member
Solution Approach 1:
The damping member serves as a mediator between the movable iron core and the housing member's inner peripheral surface. It allows the iron core to move and be guided within the housing member while absorbing collision forces, thus maintaining reliable valve control functionality without the harmful collisions and noise.
Solution Approach 2:
The damping member converts the harmful collision energy into beneficial vibration absorption and energy dissipation. By transforming the harmful collision between the iron core and housing member into controlled energy absorption, the system maintains reliable valve control while eliminating noise.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The damping member effectively reduces vibrations and noise radiation from the control valve, enhancing the operational silence of the variable-displacement compressor.
Implementation Method 1
a coil unit having a drive coil portion housed in a solenoid housing fixed to the valve housing to be disposed around the housing member, and an end portion member integrated with the drive coil portion and formed to cover a tube bottom side end portion of the housing member. The control valve is configured to drive and control the valve unit by an electromagnetic force generated by the drive coil portion
Implementation Method 2
a first damping member is disposed between a bottom wall of the housing member and the end portion member. even when the movable iron core vibrates, so as to repeatedly collide with a peripheral wall of the housing member, the vibration of the housing member can be reduced by the first damping member
Data Source
AI summary
A control valve capable of reducing vibration of a housing member, and a variable-displacement compressor provided with this control valve, are provided. A control valve 300 includes: a valve unit 310 having a valve body 304 and a movable iron core 308; a housing member 312 which is formed into a bottomed tubular shape and slidably houses the movable iron core 308; and a coil unit 313 having a drive coil portion 313A housed in a solenoid housing 311 to be disposed around the housing member 312, and an end portion member 313B formed to cover a tube bottom side end portion 312e. The control valve drives and controls the valve unit 310 by an electromagnetic force thereby adjusting an opening degree of the valve body 304. A first damping member 314 is disposed between a bottom wall 312b of the housing member 312 and the end portion member 313B.