Refrigeration system and throttle control method therefor
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Solution Overview
Problem
Conventional refrigeration systems employing throttle orifice plates have a non-adjustable throttle effect, making it difficult to meet demands under varying working conditions such as low pressure height and high flow rate, limiting their adaptability and efficiency.
Innovation Solution
Incorporating a non-adjustable main throttle element with an auxiliary bypass flow path and an adjustable electronic expansion valve, controlled by a liquid level sensor and controller, allowing for dynamic adjustment of the throttle area based on refrigerant levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a throttle orifice plate is used in a refrigeration system, then the cost is moderate and the performance is stable, but the throttle effect is non-adjustable making it difficult to meet demands under varying working conditions
Solution Approach 1:
The system is divided into two independent throttle paths: a main throttle flow path with a non-adjustable orifice plate and a bypass flow path with an adjustable electronic expansion valve. This segmentation allows each component to perform its specialized function while collectively providing both stability and adjustability.
Solution Approach 2:
The bypass flow path with the electronic expansion valve acts as an intermediary mechanism that supplements the main throttle path. When additional throttle adjustment is needed, the bypass path activates to provide the necessary flow control without affecting the stability of the main path.
2Ease of manufacture
If a fixed type of throttle orifice plate is selected according to a set working condition, then the processing is convenient and cost is moderate, but the throttle area is difficult to meet demands when working conditions change to low pressure height and high flow rate
Solution Approach 1:
The system transitions from a static, fixed-throttle design to a dynamic configuration where the electronic expansion valve in the bypass path can adjust the throttle area in real-time based on working conditions, while the main orifice plate remains fixed for ease of installation.
Solution Approach 2:
The dual-path throttle system serves multiple functions: the main orifice plate handles normal operating conditions with its fixed, optimized throttle area, while the bypass path with the electronic expansion valve provides additional throttle capacity and adjustability for varying conditions, making the system universally applicable to different operating scenarios.
Data Source
AI summary
A refrigeration system, includes a compressor, a condenser (200), a throttle flow path (100), and an evaporator (300) connected in sequence. A non-adjustable main throttle element (110,120) is disposed in the throttle flow path. A bypass flow path (500) is connected to the throttle flow path respectively at the upstream and downstream of the main throttle element, and provided with an adjustable auxiliary throttle element (510) thereon. A liquid level sensor is disposed upstream or downstream of the throttle flow path, and configured to detect the liquid level. A controller is configured to control the opening of the auxiliary throttle element according to a liquid level signal from the liquid level sensor.