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Temperature-sensing element

A temperature sensing element and temperature bulb technology, which is applied in the field of thermal expansion valves, can solve the problems of different superheat control characteristics, poor stability, and inability to meet design requirements of refrigeration systems, so as to ensure temperature control accuracy and operation stability. Good performance and improve overall energy efficiency

Inactive Publication Date: 2011-11-23
ZHEJIANG DUNAN ARTIFICIAL ENVIRONMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in the R134a refrigeration system, in the range of cooling and heating conditions: -25 ~ 10 ° C, in the range of superheat: 4 ~ 8 ° C, the maximum superheat control deviation of the thermal expansion valve filled with the same working fluid is close to 5 ℃, which makes the stability of the system operation very poor
At the same time, the superheat control characteristics of refrigeration systems in different applications are different, and the homogeneous charge cannot meet the design requirements

Method used

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Embodiment 1

[0020] The composition of the temperature-sensitive working medium is calculated by mass ratio, 47% of chlorotetrafluoroethane and 53% of octafluoropropane, which are filled in a gaseous state. In addition, the non-condensable gas filled is helium, and the filling is 3A type. Molecular sieves such as aluminosilicate 2 / 3K 2 O·1 / 3Na 2 O·Al 2 o 3 2SiO2 2 9 / 2H 2 O.

Embodiment 2

[0022] The composition of the temperature-sensitive working medium is calculated by mass ratio, 45% of chlorotetrafluoroethane and 55% of octafluoropropane, which are filled in a liquid state. In addition, the non-condensable gas to be filled is nitrogen, and the filling is activated carbon.

Embodiment 3

[0024] The composition of the temperature-sensitive working medium is calculated by mass ratio, 50% of chlorotetrafluoroethane and 50% of octafluoropropane, which are filled in liquid form, and the non-condensable gas filled is carbon dioxide, and the filling material is 4A molecular sieve such as aluminosilicate Na 2 O·Al 2 o 3 2SiO2 2 9 / 2H 2 O.

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Abstract

The invention discloses a temperature sensing element comprising a thermometer bulb and an inner cavity arranged in the thermometer bulb. A temperature-sensing working medium is filled in the inner cavity and consists of chlorotetrafluoroethane and octafluoropropane. By utilizing a thermostatic expansion valve in the temperature-sensing element disclosed by the invention, the control deviation of the superheat degree can be ensured to be smaller than 0.9 DEG C, the consistency of the control on the superheat degree of an evaporator is excellent, the temperature control precision and the operating stability of a system under cooling and heating conditions are favorably ensured and the overall energy efficiency of an R134a refrigerating system is increased.

Description

technical field [0001] The invention relates to a thermal expansion valve, in particular to a temperature sensing element of the thermal expansion valve. Background technique [0002] Thermal expansion valve is a self-operated throttling valve used in refrigeration systems. The key self-operated driving component is the power head. The function of the power head is to convert the temperature signal into the driving pressure. It is mainly composed of a temperature sensor and an air box head. , The function of the temperature sensing bag is to sense temperature, which is the temperature sensing element of the thermal expansion valve. The temperature-sensing bag is filled with temperature-sensing working fluid, which can respond to the superheated temperature at the outlet of the evaporator. The temperature bulb senses the change of the superheated temperature at the outlet of the evaporator, and the pressure in the temperature bulb changes accordingly, and acts on the upper s...

Claims

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Application Information

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IPC IPC(8): F16K31/68F25B41/06
CPCF25B41/062F25B41/335
Inventor 陈亮陈江平江挺候
Owner ZHEJIANG DUNAN ARTIFICIAL ENVIRONMENT
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