US20110132018A1 - Electronic instrument for refrigerant recovery machine - Google Patents
Electronic instrument for refrigerant recovery machine Download PDFInfo
- Publication number
- US20110132018A1 US20110132018A1 US12/633,794 US63379409A US2011132018A1 US 20110132018 A1 US20110132018 A1 US 20110132018A1 US 63379409 A US63379409 A US 63379409A US 2011132018 A1 US2011132018 A1 US 2011132018A1
- Authority
- US
- United States
- Prior art keywords
- refrigerant
- pressure
- pipe
- temperature
- control unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B45/00—Arrangements for charging or discharging refrigerant
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/002—Collecting refrigerant from a cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/003—Control issues for charging or collecting refrigerant to or from a cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/005—Service stations therefor
- F25B2345/0051—Service stations therefor having a carrying handle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
Abstract
Used in a refrigerant recovery machine having a refrigerant input pipe and a refrigerant output pipe, an electronic instrument is disclosed to include a control unit, a LCD device controllable by the control unit to display the operation status of the refrigerant recovery machine, and a pressure sensor unit having an input pipe pressure sensor and an output pipe pressure sensor for detecting the pressure in the input pipe and the pressure in the output pipe and transmitting the respective detected pressure values to the control unit for comparison with a pre-set pressure threshold limit value so that the control unit controls the operation of the refrigerant recovery machine subject to the comparison results.
Description
- 1. Field of the Invention
- The present invention relates to refrigerant recovery technology and more particularly, to an electronic instrument for use in a refrigerant recovery machine to control the operation of the refrigerant recovery machine in collecting the refrigerant from the main unit of a cooler or refrigerator.
- 2. Description of the Related Art
- A refrigerant recovery machine is adapted to draw the refrigerant out of the main unit of a system (room cooler, car cooler, central air conditioning system or refrigerator) into a recovery tank. However, a conventional refrigerant recovery machine must be equipped with an extra high-pressure mechanical type safety pressure switch and an extra mechanical vacuum type safety pressure switch. These two safety switches are respectively connected to the valve blocks in the refrigerant input pipe and refrigerant output pipe of the refrigerant recovery machine. When the input or output pressure of the refrigerant recovery machine surpasses a respective predetermined pressure threshold limit value, the respective safety switch switches off the refrigerant recovery machine, assuring operational safety. However, these mechanical safety switches have a broad range of pressure error and tend to cause an incomplete refrigerant drawing problem. Further, these mechanical safety switches are commonly heavy and expensive, increasing the cost of the refrigerant recovery machine and complicating the installation of the piping.
- Further, during the operation of a refrigerant recovery machine, the pipes of the refrigerant recovery machine may be clogged with the dirty refrigerant. Clogging of the pipes may cause freezing of the refrigerant, resulting in an abnormal pressure value and affecting the drawing of the refrigerant.
- The present invention has been accomplished under the circumstances in view. It is the main object of the present invention to provide an electronic instrument for refrigerant recovery machine, which detects the pressure of the pipes in the refrigerant recovery machine and compares the detected pressure values with predetermined pressure threshold limit values, and then controls the operation of the refrigerant recovery machine subject to the pressure comparison results, enabling the refrigerant recovery machine to draw the refrigerant from the main unit of a refrigerator or cooler accurately and safely.
- It is another object of the present invention to provide an electronic instrument for refrigerant recovery machine, which detects the temperature of the pipes in the refrigerant recovery machine and compares the detected temperature values with a predetermined temperature threshold limit value, and then controls the operation of the refrigerant recovery machine subject to the temperature comparison result, enabling the refrigerant recovery machine to draw the refrigerant from the main unit of a refrigerator or cooler accurately and safely.
- To achieve these and other objects of the present invention, an electronic instrument is used in a refrigerant recovery machine comprising a refrigerant pipe system having an input pipe and an output pipe, a compressor pipe line and a condenser pipe line. The electronic instrument comprises a control unit, a LCD device controllable by the control unit to display the operation status of the refrigerant recovery machine, a pressure sensor unit and a temperature sensor unit for detecting the pressure in the input pipe and the output pipe and the temperature in the input pipe, the output pipe, the compressor pipe line and the condenser pipe line and transmitting the respective detected pressure and temperature values to the control unit for comparison with pre-set pressure threshold limit values and temperature threshold limit values so that the control unit controls the operation of the refrigerant recovery machine subject to the comparison results.
-
FIG. 1 is an elevational view of a refrigerant recovery machine carrying an electronic instrument in accordance with the present invention. -
FIG. 2 is a system block diagram of the refrigerant recovery machine shown inFIG. 1 . -
FIG. 3 is a system block diagram of the electronic instrument in accordance with the present invention. - Referring to
FIGS. 1-3 , arefrigerant recovery machine 1 is shown carrying anelectronic instrument 2. Therefrigerant recovery machine 1 has mounted therein arefrigerant pipe system 11, acompressor pipe line 12 and acondenser pipe line 13. Therefrigerant pipe system 11 comprises aninput pipe 111 and anoutput pipe 112.Valve switches 14 are respectively in theinput pipe 111 and theoutput pipe 112 for controlling closing/opening of the respective passages. Theelectronic instrument 2 comprises acontrol unit 21, a LCD (Liquid Crystal Display)device 22, apressure sensor unit 23, atemperature sensor unit 24,operating buttons 25 and analarm 26. The LCD (Liquid Crystal Display)device 22, thepressure sensor unit 23, thetemperature sensor unit 24, theoperating buttons 25 and thealarm 26 are respectively electrically connected to thecontrol unit 21. - The
control unit 21 comprises amicroprocessor 211, amultiplexer 212 and anoperation amplifier 213. Themicroprocessor 211 has set therein pressure threshold limit values and a temperature threshold limit value. The pressure threshold limit values include a high-pressure threshold limit value and a negative pressure (vacuum) threshold limit value. - The
LCD device 22 is controllable by thecontrol unit 21 and adapted to display status data of therefrigerant recovery machine 1 transmitted by thecontrol unit 21. - The
pressure sensor unit 23 comprises an inputpipe pressure sensor 231 adapted to detect the pressure in theinput pipe 111 of therefrigerant pipe system 11 of therefrigerant recovery machine 1, and an outputpipe pressure sensor 232 adapted to detect the pressure in theoutput pipe 112 of therefrigerant pipe system 11 of therefrigerant recovery machine 1. - The
temperature sensor unit 24 comprises an inputpipe temperature sensor 241 adapted to detect the temperature in theinput pipe 111 of therefrigerant pipe system 11 of therefrigerant recovery machine 1, an outputpipe temperature sensor 242 adapted to detect the temperature in theoutput pipe 112 of therefrigerant pipe system 11 of therefrigerant recovery machine 1, a compressor pipeline temperature sensor 243 adapted to detect the temperature in thecompressor pipe line 12 and a condenser pipeline temperature sensor 244 adapted to detect the temperature in thecondenser pipe line 13. - The
operating buttons 25 are operable by the user to control thecontrol unit 21 in controlling the operation of therefrigerant recovery machine 1 and the display mode of theLCD device 22. - The
alarm 26 is controlled by thecontrol unit 21. When therefrigerant recovery machine 1 is abnormal or fails, thealarm 26 gives a warning signal. Thealarm 26 can be a buzzer or light source. - When using the
refrigerant recovery machine 1 to draw in the refrigerant from the system main unit, switch off thevalve switches 14 of therefrigerant recovery machine 1 to close theinput pipe 111 and the temperature in theoutput pipe 112, and then connect theinput pipe 111 to the system main unit and theoutput pipe 112 to a refrigerant storage tank. At this time, the user can operate theoperation buttons 25 to start therefrigerant recovery machine 1 and then switch on thevalve switches 14 of therefrigerant recovery machine 1 to open theinput pipe 111 and the temperature in theoutput pipe 112. During operation of therefrigerant recovery machine 1, the refrigerant of the system main unit is drawn by therefrigerant recovery machine 1 into theinput pipe 111 to flow through thecompressor pipe line 12 and thecondenser pipe line 13 toward the refrigerant storage tank via theoutput pipe 112. When therefrigerant recovery machine 1 is drawing the refrigerant out of the system main unit toward the refrigerant storage tank, the inputpipe pressure sensor 231 and the outputpipe pressure sensor 232 keep detecting the pressure in theinput pipe 111 and the pressure in theoutput pipe 112 respectively and provides the respective detected pressure values to thecontrol unit 21 for comparison with the set pressure threshold limit values. Because the refrigerant is being drawn out of the system main unit into theinput pipe 111, the inside pressure of the system main unit is continuously lowered, producing a vacuum. Thus, when thecontrol unit 21 receives a pressure value from the inputpipe pressure sensor 231, themicroprocessor 211 compares the pressure value with the set negative pressure (vacuum) threshold limit value. When the detected pressure value is equal to or below the set negative pressure (vacuum) threshold limit value, it means the refrigerant has been completely drawn out of the system main unit. At this time, thecontrol unit 21 drives theLCD device 22 to display the message and thealarm 26 to give an alarm signal, and then stops therefrigerant recovery machine 1. Because theoutput pipe 112 delivers the refrigerant to the refrigerant storage tank, the pressure in the refrigerant storage tank will increase gradually. When thecontrol unit 21 receives a pressure value from the outputpipe pressure sensor 232, themicroprocessor 211 compares the pressure value with the set high pressure threshold limit value. When the detected pressure value is equal to or above the set high pressure threshold limit value, it means the storage amount of the refrigerant in the refrigerant storage tank has reached to the desired level. At this time, thecontrol unit 21 stops the operation of the refrigerant recovery machine 1 (if therefrigerant recovery machine 1 is not stopped at this time, the refrigerant storage tank may be unable to sustain the pressure and may break or the collected refrigerant may leaks through the relief valve to pollute the air) and drives theLCD device 22 to display the message and thealarm 26 to give an alarm signal. After replacement of the refrigerant storage tank that is fully filled up with the refrigerant with an empty refrigerant storage tank by the user, the pressure detected by the outputpipe pressure sensor 232 will be below the set high pressure threshold limit value, enabling thecontrol unit 21 to start therefrigerant recovery machine 1 and to draw the refrigerant out of the system main unit again. The user can also operate theoperation buttons 25 to start therefrigerant recovery machine 1 after replacement of the refrigerant storage tank that is fully filled up with the refrigerant with an empty refrigerant storage tank. During operation of therefrigerant recovery machine 1, the inputpipe temperature sensor 241, outputpipe temperature sensor 242, compressor pipeline temperature sensor 243 and condenser pipeline temperature sensor 244 of thetemperature sensor unit 24 detect the temperature in theinput pipe 111 andoutput pipe 112 of therefrigerant pipe system 11 of therefrigerant recovery machine 1 and the temperature in thecompressor pipe line 12 and the temperature in thecondenser pipe line 13 respectively and transmit the respective detected temperature values to thecontrol unit 21 so that themicroprocessor 211 of thecontrol unit 21 compares the received temperature values with the set temperature threshold limit value. When the detected temperature value from the inputpipe temperature sensor 241, the outputpipe temperature sensor 242, the compressor pipeline temperature sensor 243 or the condenser pipeline temperature sensor 244 is equal to or below the set temperature threshold limit value, it means the corresponding pipe line is a frozen status to block transfer of the refrigerant. Therefore, thecontrol unit 21 stops therefrigerant recovery machine 1 and drives theLCD device 22 to display the message and thealarm 26 to give an alarm signal when the detected temperature value from the inputpipe temperature sensor 241, the outputpipe temperature sensor 242, the compressor pipeline temperature sensor 243 or the condenser pipeline temperature sensor 244 is equal to or below the set temperature threshold limit value. After the trouble is eliminated and the temperature resumes normal, thecontrol unit 21 starts therefrigerant recovery machine 1 again. Further, themicroprocessor 211 has set therein an abnormality detection temperature value. When the detected temperature value from the compressor pipeline temperature sensor 243 or the condenser pipeline temperature sensor 244 reaches the set abnormality detection temperature value, it means thecompressor pipe line 12 or thecondenser pipe line 13 has broken or there is a refrigerant leakage. At this time, thecontrol unit 21 stops therefrigerant recovery machine 1 and drives theLCD device 22 to display the message and thealarm 26 to give an alarm signal. - In conclusion, the invention utilizes the
pressure sensor unit 23 andtemperature sensor unit 24 of theelectronic instrument 2 to detect the refrigerant drawing status and thecontrol unit 21 to control the operation of therefrigerant recovery machine 1 subject to the results of comparison of the detected values from thepressure sensor unit 23 and thetemperature sensor unit 24 with predetermined pressure and temperature threshold limit values, eliminating the use of high-pressure mechanical type and mechanical vacuum type safety pressure switch means as seen in the prior art techniques, reducing the cost and dimension of therefrigerant recovery machine 1. - Although a particular embodiment of the invention has been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.
Claims (3)
1. An electronic instrument used in a refrigerant recovery machine comprising a refrigerant pipe system, a compressor pipe line and a condenser pipe line, said refrigerant pipe system having an input pipe and an output pipe, the electronic instrument comprising:
a control unit for controlling the operation of said refrigerant recovery machine, said control unit comprising a microprocessor having set therein at least one pressure threshold limit value;
a liquid crystal display device electrically connected to said control unit and controllable by said control unit to display status of said refrigerant recovery machine; and
a pressure sensor unit electrically connected to said control unit, said pressure sensor unit comprising an input pipe pressure sensor adapted to detect the pressure in said input pipe and to transmit the detected temperature value to said control unit for comparison with one said pressure threshold limit value and an output pipe pressure sensor adapted to detect the pressure in said input pipe and to transmit the detected temperature value to said control unit for comparison with one said pressure threshold limit value.
2. The electronic instrument as claimed in claim 1 , wherein said at least one pressure threshold limit value comprises a high-pressure threshold limit value and a negative pressure threshold limit value.
3. The electronic instrument as claimed in claim 1 , further comprising a temperature sensor unit electrically connected to said microprocessor of said control unit, said temperature sensor unit comprising an input pipe temperature sensor adapted to detect the temperature in said input pipe and to transmit the detected temperature value to said microprocessor for comparison with a predetermined temperature threshold limit value set in said microprocessor, an output pipe temperature sensor adapted to detect the temperature in said output pipe and to transmit the detected temperature value to said microprocessor for comparison with said predetermined temperature threshold limit value, a compressor pipe line temperature sensor adapted to detect the temperature in said compressor pipe line and to transmit the detected temperature value to said microprocessor for comparison with said predetermined temperature threshold limit value and a condenser pipe line temperature sensor adapted to detect the temperature in said condenser pipe line and to transmit the detected temperature value to said microprocessor for comparison with said predetermined temperature threshold limit value.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/633,794 US20110132018A1 (en) | 2009-12-08 | 2009-12-08 | Electronic instrument for refrigerant recovery machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/633,794 US20110132018A1 (en) | 2009-12-08 | 2009-12-08 | Electronic instrument for refrigerant recovery machine |
Publications (1)
Publication Number | Publication Date |
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US20110132018A1 true US20110132018A1 (en) | 2011-06-09 |
Family
ID=44080639
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/633,794 Abandoned US20110132018A1 (en) | 2009-12-08 | 2009-12-08 | Electronic instrument for refrigerant recovery machine |
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US (1) | US20110132018A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100154442A1 (en) * | 2008-12-22 | 2010-06-24 | Michael Steven Schoenoff | Portable Refrigerant Recovery Machine |
USD666224S1 (en) * | 2011-09-28 | 2012-08-28 | Cps Products, Inc. | Refrigerant recovery unit |
WO2013068310A3 (en) * | 2011-11-08 | 2013-08-22 | Robert Bosch Gmbh | A method to operate a refrigerant recovery and recharge device |
WO2014053195A1 (en) * | 2012-10-01 | 2014-04-10 | Refco Manufacturing Ltd. | Service device for air conditioning systems |
WO2014143789A1 (en) * | 2013-03-15 | 2014-09-18 | Bosch Automotive Service Solutions Llc | Compressor device and method |
US20160187042A1 (en) * | 2014-12-30 | 2016-06-30 | Bosch Automotive Service Solutions Inc. | System and method for recovering refrigerant |
USD916141S1 (en) * | 2019-09-06 | 2021-04-13 | Harbor Freight Tools Usa, Inc. | Air compressor |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5560215A (en) * | 1992-05-14 | 1996-10-01 | Talarico; Angelo | Gas processor |
-
2009
- 2009-12-08 US US12/633,794 patent/US20110132018A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5560215A (en) * | 1992-05-14 | 1996-10-01 | Talarico; Angelo | Gas processor |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8800306B2 (en) * | 2008-12-22 | 2014-08-12 | Bosch Automotive Service Solutions Llc | Portable refrigerant recovery machine |
US20100154442A1 (en) * | 2008-12-22 | 2010-06-24 | Michael Steven Schoenoff | Portable Refrigerant Recovery Machine |
USD666224S1 (en) * | 2011-09-28 | 2012-08-28 | Cps Products, Inc. | Refrigerant recovery unit |
WO2013068310A3 (en) * | 2011-11-08 | 2013-08-22 | Robert Bosch Gmbh | A method to operate a refrigerant recovery and recharge device |
CN104685306A (en) * | 2012-10-01 | 2015-06-03 | 瑞福可制造有限公司 | Service device for air conditioning systems |
WO2014053195A1 (en) * | 2012-10-01 | 2014-04-10 | Refco Manufacturing Ltd. | Service device for air conditioning systems |
US9448140B2 (en) | 2012-10-01 | 2016-09-20 | Refco Manufacturing Ltd. | Service device for air-conditioning systems |
WO2014143789A1 (en) * | 2013-03-15 | 2014-09-18 | Bosch Automotive Service Solutions Llc | Compressor device and method |
US20160187042A1 (en) * | 2014-12-30 | 2016-06-30 | Bosch Automotive Service Solutions Inc. | System and method for recovering refrigerant |
EP3040652A1 (en) * | 2014-12-30 | 2016-07-06 | Robert Bosch Gmbh | System and method for recovering refrigerant |
CN106052225A (en) * | 2014-12-30 | 2016-10-26 | 博世汽车服务解决方案公司 | System and method for recovering refrigerant |
US10429110B2 (en) * | 2014-12-30 | 2019-10-01 | Bosch Automotive Service Solutions Inc. | System and method for recovering refrigerant |
USD916141S1 (en) * | 2019-09-06 | 2021-04-13 | Harbor Freight Tools Usa, Inc. | Air compressor |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SUN-WONDER INDUSTRIAL CO., LTD., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CHANG, AN-CHAO;REEL/FRAME:023623/0930 Effective date: 20091130 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |