Refrigeration device, temperature sensor mounting pipe, and temperature sensor mounting structure
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Solution Overview
Problem
The complexity of two-way refrigerant circuits in refrigeration apparatuses makes simple temperature detection and control inefficient, leading to suboptimal operation.
Innovation Solution
Incorporating a cascade heat exchanger and a temperature sensor installed between the heat exchanger and decompressor in the low-temperature side refrigerant circuit, allowing for efficient temperature control and detection of the refrigerant's temperature directly affecting the cooling object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a two-way refrigerant circuit is used to cool the storage unit, then the cooling capability is improved, but the system complexity increases making temperature detection and control less efficient
Solution Approach 1:
The refrigerant circuit is divided into two independent systems: a high-temperature side refrigerant circuit and a low-temperature side refrigerant circuit. Each circuit operates independently with its own compressor, condenser, expansion valve, and evaporator, allowing simplified control and temperature detection in each segment rather than managing a complex single circuit
Solution Approach 2:
A cascade heat exchanger is introduced as an intermediary component that couples the high-temperature side and low-temperature side refrigerant circuits. The heat exchanger enables heat transfer between the two circuits, allowing the high-temperature refrigerant to cool the low-temperature refrigerant, thus achieving efficient temperature control without direct mixing of the circuits
2Measurement precision
If temperature sensor is installed in the low-temperature side refrigerant circuit after the cascade heat exchanger, then the temperature detection accuracy is improved, but the sensor maintenance becomes more difficult
Solution Approach 1:
The temperature sensor is mounted on the external surface of the pipeline rather than being inserted into the refrigerant flow path. This external mounting approach allows the sensor to detect refrigerant temperature through thermal conduction from the pipe wall, achieving accurate measurement while maintaining easy accessibility for installation and maintenance
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
This configuration enables more efficient operation of the refrigeration apparatus by quickly detecting temperature changes in the refrigerant, improving cooling efficiency and simplifying maintenance of the temperature sensor.
Implementation Method 1
a cascade heat exchanger configured to cool the low-temperature side refrigerant by using the high-temperature side refrigerant
Data Source
AI summary
This refrigeration device comprises: a high temperature side refrigerant circuit in which a high temperature side refrigerant circulates; a low temperature side refrigerant circuit in which a low temperature side refrigerant circulates; and a cascade heat exchanger that cools the low temperature side refrigerant with the high temperature side refrigerant. In the low temperature side refrigerant circuit, a low temperature side decompressor is disposed downstream of the cascade heat exchanger and a temperature sensor is installed in a piping portion between the cascade heat exchanger and the low temperature side decompressor.