Adjustable Shaft Control Valve for Variable Displacement Compressor
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Solution Overview
Problem
Existing control valves for variable displacement compressors in automotive air conditioners lack the ability for fine adjustment of suction pressure after installation, particularly when the pressure-sensing section is located inside the control valve body.
Innovation Solution
A control valve design that includes a shaft extending along the axis line for adjusting the drive force of the pressure-sensing section, allowing for easy fine-tuning of the load setting by adjusting the shaft's position or press-fitting amount, enabling precise control of suction pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pressure-sensing section is disposed inside the control valve body, then the control valve structure is more compact and integrated, but fine adjustment of the suction pressure setting after installation becomes difficult
Solution Approach 1:
The shaft is designed to be adjustable in position along the axis line, transforming a static structure into a dynamic one that can be modified after installation. This allows the drive force of the pressure-sensing section to be fine-tuned by changing the shaft's position, thereby resolving the contradiction between integrated structure and adjustability.
Solution Approach 2:
The control valve is divided into functional sections with the shaft as a separate adjustable component. The shaft can be independently adjusted relative to the body and pressure-sensing section, enabling fine adjustment of the suction pressure setting without disassembling the entire integrated structure.
2Measurement precision
If the shaft position is adjusted to fine-tune the drive force, then the suction pressure setting accuracy is improved, but the manufacturing and assembly process becomes more complex
Solution Approach 1:
The shaft is designed with predetermined adjustment positions or markings that guide the assembly process. This preliminary design feature allows for accurate adjustment without requiring complex measurement tools or procedures during assembly, thereby maintaining ease of manufacture while achieving high precision.
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
Enables accurate and easy external adjustment of the suction pressure setting, improving the compressor's operational efficiency and preventing evaporator freezing by maintaining the suction pressure within a predetermined range.
Implementation Method 1
a solenoid, provided at the other end side of the body, configured to drive the main valve element in a valve closing direction in accordance with an amount of current supplied
Implementation Method 2
a pressure-sensing section including a pressure-sensing member displaced by sensing the suction pressure, wherein the pressure sensing section exerts a drive force against solenoidal force
Data Source
AI summary
A control valve includes a body having a crankcase communicating port, a discharge chamber communicating port and a suction chamber communicating port, which are arranged in this order from one end side of the body, a solenoid, provided at the other end side of the body, for driving a main valve in accordance with the amount of current supplied, a power element, provided in an inner space surrounded by the body and the solenoid, capable of exerting the drive force to resist the solenoidal force created by a displacement of a pressure-sensing member of the power element, and a shaft by which the drive force of the power element is adjustable by adjusting the fixed position of one end side of the shaft, the shaft being fixed to one end of the body and the other end of the shaft being joined with the power element.