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Refrigeration air dryer

a dryer and refrigeration technology, applied in the direction of defrosting, separation process, domestic cooling apparatus, etc., can solve the problems of difficult to maintain the temperature stably in such an arrangement, large electric power consumption, etc., and achieve high precision, high precision, high precision

Inactive Publication Date: 2010-05-06
SMC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]It is a technical object of the present invention to provide a refrigeration air dryer which is capable of controlling the temperature of the secondary air in the outlet pipe with high precision as with an arrangement employing an electric heater, using a reheater employing heat occurring in the refrigerant system to raise the temperature of the secondary compressed air, by adjusting the flow rate of the refrigerant or air flowing through the reheater, without a need to heat the secondary air in the outlet pipe using an electric heater unlike the aforementioned conventional refrigeration air dryer.
[0018]With the refrigeration air dryer according to the present invention having the above-described configuration, the flow rate of the dehumidified air to be transmitted to the reheater after drain separation processing, or the flow rate of the refrigerant from the refrigerant compressor is controlled based upon the temperature of the dehumidified air flowing through the outlet pipe such that the temperature thereof is maintained at a constant level. Accordingly, the refrigeration air dryer is capable of controlling the flow rate thereof with relatively high precision using electric means. Thus, the refrigeration air dryer employing such a reheater is capable of controlling the temperature of the compressed air in the outlet pipe with high precision as with an arrangement employing an electric heater.
[0019]The above-described refrigeration air dryer according to the present invention employs the reheater to use heat that occurs in the refrigerant system to raise the temperature of the compressed air at the outlet pipe, instead of employing an electric heater to heat the dehumidified air at the outlet pipe, unlike the aforementioned conventional refrigeration air dryers. By adjusting the flow rate of the fluid that flows through the reheater, such an arrangement controls the temperature of the compressed air at the outlet pipe with high precision as with an arrangement employing an electric heater.

Problems solved by technology

Accordingly, although the aforementioned conventional refrigeration air dryer is capable of controlling the temperature with high precision, such an arrangement has the disadvantage of great electric power consumption.
It is difficult for such an arrangement to stably maintain the temperature in a required temperature range.

Method used

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Experimental program
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first embodiment

[0024]Roughly, the refrigeration air dryer shown in FIG. 1 includes a refrigerant system, an air system, and a control system which controls the flow rate of dehumidified air or the flow rate of a refrigerant flowing through a reheater 18 connected to the refrigerant system and the air system, so as to maintain the temperature of the secondary air output from the refrigeration air dryer.

[0025]The aforementioned refrigerant system includes: a refrigerant compressor 10; a high-temperature refrigerant pipe 22 which transmits a refrigerant, which has been compressed by the refrigerant compressor 10 so as to have a high temperature, to the reheater 18; a condenser 11 which condenses the refrigerant transmitted from the reheater 18 via an intermediate refrigerant pipe 27; an expansion valve 12 which decompresses, by adiabatic expansion, the refrigerant thus condensed by the condenser 11 so as to lower the temperature of the refrigerant; and a cooler 13 which cools the moist compressed ai...

second embodiment

[0043]On the other hand, in the above-described second embodiment, the refrigerant bypass pipe 31 is provided branching from the high-temperature refrigerant pipe 22 which transmits the refrigerant from the refrigerant compressor 10 to the reheater 18, and the three-way flow adjusting valve 32 is arranged at the junction thus formed. Also, instead of this junction, the three-way flow adjusting valve 32 may be arranged at the junction of the refrigerant bypass pipe 31 and the intermediate refrigerant pipe 27 arranged on the outlet side of the reheater 18.

[0044]It is needless to say that, in such modifications in which the three-way flow adjusting valve is arranged at such a pipe junction, the flow rate of the dehumidified air or the refrigerant flowing through the reheater 18 and the bypass pipe 29 or 31 is controlled according to a control signal received from the temperature controller 42.

[0045]The three-way flow adjusting valve arranged at the junction is not restricted to a singl...

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Abstract

A refrigeration air dryer outputs dehumidified air dehumidified by a cooling operation using a low-temperature refrigerant after the temperature thereof has been raised by exchanging heat with a high-temperature refrigerant at a reheater. The refrigeration air dryer includes a temperature sensor which detects the temperature of secondary air in the outlet pipe, valve means which adjusts the flow rate of the dehumidified air or the flow rate of the refrigerant flowing through the reheater, and a temperature controller which adjusts the flow rate of the dehumidified air or the flow rate of the refrigerant by controlling the valve means based upon the detected temperature detected by the temperature sensor, thereby maintaining the temperature of the secondary air at a constant level.

Description

BACKGROUND OF THE INVENTION[0001][1] Field of the Invention[0002]The present invention relates to a refrigeration air dryer which dehumidifies compressed air by condensing the moisture in the compressed air by cooling the compressed air.[0003][2] Description of the Related Art[0004]In air compressor system employing solenoid valves, air cylinders, etc., in order to prevent trouble from occurring due to the moisture included in compressed air to be supplied to the air compressor system, the moisture included in the compressed air is preferably removed beforehand. In order to remove such moisture, a refrigeration air dryer is employed. Such a refrigeration air dryer preferably controls the temperature of the compressed air at the outlet of the air dryer so as to again raise the temperature of the dehumidified compressed air in order to prevent occurrence of dew condensation at the secondary air pipe in the air dryer due to low-temperature compressed air dehumidified by cooling.[0005]F...

Claims

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Application Information

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IPC IPC(8): F25D21/00F25B1/00
CPCB01D53/265F25B43/00F25B29/00F25B49/02
Inventor AONO, HIDEAKI
Owner SMC CORP