Balanced Thermostatic Expansion Valve for Precise Pressure Regulation
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Solution Overview
Problem
The existing thermal expansion valves in refrigerating systems face challenges with systematic pressure differences affecting the accuracy of valve core regulation, particularly in high-pressure systems, and have issues with part complexity, dimension tolerance, and sealing requirements that lead to reduced performance and increased leakage risk.
Innovation Solution
The thermal expansion valve design features balanced pressure-bearing surfaces and a communication structure between the lower chamber and balance chamber, reducing systematic pressure differences and eliminating the need for separate parts, thereby improving regulation accuracy and reducing leakage risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the balance chamber communicates with the first interface chamber, then the pressure difference is reduced, but the sealing requirement increases and leakage risk increases
Solution Approach 1:
The patent extracts the communication path between the balance chamber and the first interface chamber by introducing a sealed second interface chamber. The balance chamber is now isolated from the high-pressure first interface chamber, eliminating the sealing problems while maintaining pressure balance through the integrated valve core design.
Solution Approach 2:
The patent segments the interface chamber into two separate chambers: a first interface chamber for high-pressure refrigerant and a second interface chamber for low-pressure refrigerant. This segmentation allows the balance chamber to communicate with the second interface chamber instead of the first, reducing sealing requirements and leakage risk.
2Measurement precision
If the valve core, transmission rod, and guide ball are separated into multiple parts, then the assembly is more complex, but the regulation accuracy can be improved
Solution Approach 1:
The patent merges the valve core, transmission rod, and guide ball into a single integrated valve core component. This integration eliminates the need for multiple separate parts and their associated clearances, reducing dimension tolerance accumulation while maintaining regulation accuracy through the unified structural design.
3Measurement precision
If the clearance between transmission piece and valve core is reduced, then the dimension tolerance accumulates, but the regulation accuracy improves
Solution Approach 1:
By integrating the transmission rod with the valve core into a single piece, the patent eliminates the clearance between these components entirely. This removes the source of dimension tolerance accumulation while maintaining the necessary regulation accuracy through the integrated structural design.
4Measurement precision
If the valve core is provided with a through hole for pressure communication, then the pressure balance is achieved, but the processing difficulty increases
Solution Approach 1:
The patent extracts the pressure communication function from the valve core by providing a separate communication hole in the valve body. This allows the valve core to remain a solid, easily manufacturable component while still achieving pressure balance between chambers through the external communication path.
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 improved design achieves a perfect balance in refrigerant flow in both directions, enhancing the accuracy of valve core regulation and reducing the risk of leakage, while simplifying the structure and processing costs.
Implementation Method 1
The temperature sensing bulb 4'2 is configured to sense the degree of superheating of refrigerant at the outlet end of the evaporator and the inlet end of the compressor, and generate a temperature pressure P b in the upper chamber
Implementation Method 2
The spring 6' imparts an upward elastic force Pt to the valve core 3'1
Implementation Method 3
the lower chamber 2'3 communicates with the outlet end of the evaporator via a balance tube (not shown), so as to generate an evaporating pressure P o in the lower chamber 2'3
Data Source
Figure 1
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Figure 3
AI summary
Disclosed are a thermostatic expansion valve and a refrigerating system comprising the thermostatic expansion valve. The thermostatic expansion valve comprises a valve body (1) arranged with an air box on the top, and the inner chamber of the air box is divided into an upper chamber (22) and a lower chamber (23) by a diaphragm (21). Within the inner chamber of the valve body (1) there are provided a valve plug component (3) and a valve port (11) matched with the valve plug component (3). The inner chamber of the valve body (1) is divided into a first interface chamber (12) and a second interface chamber (13) by a sealing line or sealing face (31) between the valve port (11) and the valve plug component (3). At the lower end part of the valve body (1) there is provided a balance chamber (14) to balance the valve plug component (3). The upper end part of the valve plug component (3) is arranged within the lower chamber (23) and the lower end part thereof is arranged within the balance chamber (14) of the valve body (1). The balance chamber (14) is in communication with the lower chamber (23), and the balance chamber (14) is in sealed isolation from both the first interface chamber (12) and the second interface chamber (13). The structure of the thermostatic expansion valve is capable of reducing the systematic pressure difference to which the valve plug component (3) is subjected, such that the regulating precision of the valve plug component (3) is improved.