CN102817822B - Refrigeration plant Digital Pressure Controller - Google Patents

Refrigeration plant Digital Pressure Controller Download PDF

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Publication number
CN102817822B
CN102817822B CN201210330026.3A CN201210330026A CN102817822B CN 102817822 B CN102817822 B CN 102817822B CN 201210330026 A CN201210330026 A CN 201210330026A CN 102817822 B CN102817822 B CN 102817822B
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China
Prior art keywords
pressure
low
high
executive circuit
cold
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CN201210330026.3A
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Chinese (zh)
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CN102817822A (en
Inventor
周水根
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浙江鸿森机械有限公司
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Publication of CN102817822A publication Critical patent/CN102817822A/en
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Abstract

The invention discloses a kind of refrigeration plant Digital Pressure Controller, this controller comprises the microprocessor being built-in with one or more cold-producing mediums pressure enthalpy parameter, control executive circuit, the signal of telecommunication of pressure sensor is converted to the analog-to-digital conversion circuit of data signal.The present invention is by the pressure data of pressure sensor collect and process machine, the signal of telecommunication of pressure sensor is converted to the analog-to-digital conversion circuit of data signal, to the microprocessor input pressure data of built-in cold-producing medium pressure enthalpy parameter, and by microprocessor, data are contrasted, and then to controlling the relay output action order of executive circuit, realize the security control of compressor.

Description

Refrigeration plant Digital Pressure Controller

Technical field

The present invention relates to a kind of pressure control device, particularly relate to refrigeration plant Digital Pressure Controller.

Background technology

General existing pressure controller mostly adopts mechanical type to control, and obviously there is significant deficiency for control accuracy and sensitivity aspect in traditional mechanical type control mode, the pressure controller even caused because machinery is stuck, the disasters such as the compressor blast of control.Compressor is the core component in refrigeration plant, the force value of the pressure controller required by the cold-producing medium difference that different compressors uses also is diverse, the installation personnel when installing and using compressor is caused to arrange or regulate pressure thus, need to observe Pressure gauge while check that the rating data of this kind of cold-producing medium bothers very much, the not traditional mechanical type pressure controller of this technical problem can solve, and is not more that common electronic pressure controller can be suitable for.

Chinese invention patent patent No. 200910201238.X discloses a kind of electronic pressure controller, this controller comprises control comparison circuit, the signal processing circuit be connected with control comparison circuit input respectively and digital-to-analogue conversion control module, and the proportion magnetic valve be connected with control comparison circuit output.This kind of electronic pressure controller presses enthalpy parameter to be obviously the compressor that can not be suitable for refrigeration plant owing to not having built-in cold-producing medium.

Summary of the invention

The invention provides a kind of structure simple, easy to use, safe, for the compressor refrigeration plant Digital Pressure Controller of refrigeration plant.

A kind of refrigeration plant Digital Pressure Controller, this controller comprises the microprocessor being built-in with one or more cold-producing mediums pressure enthalpy parameter, control executive circuit, the signal of telecommunication of pressure sensor is converted to the analog-to-digital conversion circuit of data signal, the button inputting circuits be connected with microprocessor input pin, the cold-producing medium that microprocessor shows built-in setting by display presses enthalpy parameter and the actual cold-producing medium detected press enthalpy parameter and carry out Data Comparison by microprocessor, according to Data Comparison result to the relay output action order controlling executive circuit, and then the compressor switch of control connection refrigeration plant Digital Pressure Controller.The pressure data of this kind of employing pressure sensor collect and process machine, the signal of telecommunication of pressure sensor is converted to the analog-to-digital conversion circuit of data signal, to the microprocessor input pressure data of built-in cold-producing medium pressure enthalpy parameter, and by microprocessor, data are contrasted, and then to controlling the relay output action order of executive circuit, realize the security control of compressor.

Described cold-producing medium pressure enthalpy parameter is that one or more in following five kinds of cold-producing medium models are respectively R22, R134a, R404A, R407c, R410A.Cold-producing medium is not limited to above-mentioned five kinds due to the data of One's name is legion input microprocessor, and above-mentioned five kinds is the cold-producing medium comparatively commonly used.

Described pressure sensor is two and is respectively high-pressure side pressure sensor and low-pressure end pressure sensor; Described control executive circuit is that two covers are respectively high voltage control executive circuit and low voltage control executive circuit, improves the accuracy of pressure data collection and execution.

Described button inputting circuits is provided with and arranges key, adds 1 key, subtracts 1 key, press during use and key is set, in conjunction with adding 1 key, subtracting 1 key, start selection to the cold-producing medium model of display display to determine, and high-pressure side pressure set points, high-pressure side differential values, low-pressure end pressure set points, the low-pressure end differential values of refrigeration plant Digital Pressure Controller are set.When the low-pressure end force value of its induction of described low-pressure end pressure sensor is less than the low-pressure end pressure set points of setting, the actuating of relay of low voltage control executive circuit; When low-pressure end force value is greater than low-pressure end pressure set points+low-pressure end differential values, the relay recovery of low voltage control executive circuit is normal; When the high-pressure side force value of its induction of described high-pressure side pressure sensor is greater than the high-pressure side pressure set points of setting, the actuating of relay of high voltage control executive circuit; When high-pressure side force value is less than high-pressure side pressure set points-high-pressure side differential values, the relay recovery of high voltage control executive circuit is normal.

The present invention is by the pressure data of pressure sensor collect and process machine, the signal of telecommunication of pressure sensor is converted to the analog-to-digital conversion circuit of data signal, to the microprocessor input pressure data of built-in cold-producing medium pressure enthalpy parameter, and by microprocessor, data are contrasted, and then to controlling the relay output action order of executive circuit, realize the security control of compressor.

Accompanying drawing explanation

Be illustrated in figure 1 refrigeration plant Digital Pressure Controller structured flowchart of the present invention.

Be illustrated in figure 2 refrigeration plant Digital Pressure Controller circuit theory diagrams of the present invention;

Be illustrated in figure 3 the high-pressure side analog-to-digital conversion circuit of refrigeration plant Digital Pressure Controller of the present invention;

Be illustrated in figure 4 the low-pressure end analog-to-digital conversion circuit of refrigeration plant Digital Pressure Controller of the present invention;

Be illustrated in figure 5 the high voltage control executive circuit of refrigeration plant Digital Pressure Controller of the present invention;

Be illustrated in figure 6 the low voltage control executive circuit of refrigeration plant Digital Pressure Controller of the present invention.

Detailed description of the invention

The detailed description of the invention of refrigeration plant Digital Pressure Controller of the present invention as shown in Figures 1 to 6, refrigeration plant Digital Pressure Controller of the present invention comprises the microprocessor 1 being built-in with one or more cold-producing mediums pressure enthalpy parameter, control executive circuit 4, the signal of telecommunication of pressure sensor 6 is converted to the analog-to-digital conversion circuit 5 of data signal, the button inputting circuits 3 be connected with microprocessor input pin, the cold-producing medium that microprocessor 1 shows built-in setting by display 2 presses enthalpy parameter and the actual cold-producing medium detected press enthalpy parameter and carry out Data Comparison by microprocessor 1, according to Data Comparison result to the relay output action order controlling executive circuit 4, and then the compressor switch of control connection refrigeration plant Digital Pressure Controller.

Be that one or more in following five kinds of cold-producing medium models are respectively R22, R134a, R404A, R407c, R410A as structure preferred refrigerant pressure enthalpy parameter.

Pressure sensor 6 is two and is respectively high-pressure side pressure sensor and low-pressure end pressure sensor; Described control executive circuit 4 is that two covers are respectively high voltage control executive circuit and low voltage control executive circuit.

Button inputting circuits 3 is provided with and arranges key, adds 1 key, subtracts 1 key, press during use and key is set, in conjunction with adding 1 key, subtracting 1 key, start selection to the cold-producing medium model of display 2 display to determine, and high-pressure side pressure set points, high-pressure side differential values, low-pressure end pressure set points, the low-pressure end differential values of refrigeration plant Digital Pressure Controller are set.When the low-pressure end force value of its induction of low-pressure end pressure sensor is less than the low-pressure end pressure set points of setting, the actuating of relay of low voltage control executive circuit; When low-pressure end force value is greater than low-pressure end pressure set points+low-pressure end differential values, the relay recovery of low voltage control executive circuit is normal; When the high-pressure side force value of its induction of described high-pressure side pressure sensor is greater than the high-pressure side pressure set points of setting, the actuating of relay of high voltage control executive circuit; When high-pressure side force value is less than high-pressure side pressure set points-high-pressure side differential values, the relay recovery of high voltage control executive circuit is normal.

Refrigeration plant of the present invention comprises to connect in button inputting circuits 3 with the microprocessor 1 of Digital Pressure Controller and arranges key, adds 1 key, subtracts the pin of 1 key and correspond to 30,29,10, connect DOUTH3 pin and the DOUTL2 pin of high-pressure side analog-to-digital conversion circuit and low-pressure end analog-to-digital conversion circuit respectively, connect CTLI pin and the CTL2 pin of high voltage control executive circuit and low voltage control executive circuit respectively.

High-pressure side analog-to-digital conversion circuit comprises the high-pressure inductor CN1 of analog-digital converter HX711 and connection thereof.Low-pressure end analog-to-digital conversion circuit comprises the low pressure inductor CN2 of analog-digital converter HX711 and connection thereof.High voltage control executive circuit and low voltage control executive circuit are respectively containing relay J Z1 and relay J Z2, and model is HK4100F.

Its concrete control flow is as follows: high-pressure side pressure sensor is connected compressor high-voltage end and low-pressure end respectively with low-pressure end pressure sensor, first refrigeration plant Digital Pressure Controller is arranged, press and key is set, when the cold-producing medium model of display 2 starts flicker, press and add 1 key or subtract 1 key, cold-producing medium model starts conversion, when arriving the model required for user, unclamp and add 1 key or subtract 1 key, stop flicker several times afterwards in the flicker of cold-producing medium model, cold-producing medium model arranges end; Press again and key is set, low-pressure end pressure set points starts flicker, press equally and add 1 key or subtract 1 key, low-pressure end pressure set points starts to add 1 or subtract 1, until numerical value arrives the setting numerical value required for user, unclamp button, setting value flicker stops flicker several times afterwards, and low-pressure end pressure set points arranges end; Again press and key is set, high-pressure side pressure set points starts flicker, above-mentioned same method is adopted to complete the setting of high-pressure side pressure set points, another is pressed and arranges key, above-mentioned same method is adopted to complete the setting of low-pressure end differential values, press again and key is set, adopt above-mentioned same method to complete the setting of high-pressure side differential values.When the low-pressure end force value of its induction of low-pressure end pressure sensor is less than the low-pressure end pressure set points of setting, the actuating of relay of low voltage control executive circuit makes compressor close; When low-pressure end force value is greater than low-pressure end pressure set points+low-pressure end differential values, the relay recovery healthy compressor of low voltage control executive circuit is opened; When the high-pressure side force value of its induction of high-pressure side pressure sensor is greater than the high-pressure side pressure set points of setting, the actuating of relay of high voltage control executive circuit makes compressor close; When high-pressure side force value is less than high-pressure side pressure set points-high-pressure side differential values, the relay recovery of high voltage control executive circuit normally makes compressor open, thus protects compressor from mistake high pressure or the infringement of crossing low pressure.

Claims (2)

1. a refrigeration plant Digital Pressure Controller, it is characterized in that: this controller comprises the microprocessor (1) being built-in with one or more cold-producing mediums pressure enthalpy parameter, control executive circuit (4), the signal of telecommunication of pressure sensor (6) is converted to the analog-to-digital conversion circuit (5) of data signal, the button inputting circuits (3) be connected with microprocessor input pin, the cold-producing medium that microprocessor (1) shows built-in setting by display (2) presses enthalpy parameter and the actual cold-producing medium detected press enthalpy parameter and carry out Data Comparison by microprocessor (1), according to Data Comparison result to the relay output action order controlling executive circuit (4), and then the compressor switch of control connection refrigeration plant Digital Pressure Controller, described pressure sensor (6) is two and is respectively high-pressure side pressure sensor and low-pressure end pressure sensor, described control executive circuit (4) is that two covers are respectively high voltage control executive circuit and low voltage control executive circuit, described button inputting circuits (3) is provided with and arranges key, adds 1 key, subtracts 1 key, press during use and key is set, in conjunction with adding 1 key, subtracting 1 key, the cold-producing medium model shown display (2) starts selection and determines, and arranges high-pressure side pressure set points, high-pressure side differential values, low-pressure end pressure set points, the low-pressure end differential values of refrigeration plant Digital Pressure Controller, when the low-pressure end force value of its induction of described low-pressure end pressure sensor is less than the low-pressure end pressure set points of setting, the actuating of relay of low voltage control executive circuit, when low-pressure end force value is greater than low-pressure end pressure set points+low-pressure end differential values, the relay recovery of low voltage control executive circuit is normal, when the high-pressure side force value of its induction of described high-pressure side pressure sensor is greater than the high-pressure side pressure set points of setting, the actuating of relay of high voltage control executive circuit, when high-pressure side force value is less than high-pressure side pressure set points-high-pressure side differential values, the relay recovery of high voltage control executive circuit is normal.
2. refrigeration plant Digital Pressure Controller as claimed in claim 1, is characterized in that: described cold-producing medium pressure enthalpy parameter is that one or more in following five kinds of cold-producing medium models are respectively R22, R134a, R404A, R407c, R410A.
CN201210330026.3A 2012-09-06 2012-09-06 Refrigeration plant Digital Pressure Controller CN102817822B (en)

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CN201210330026.3A CN102817822B (en) 2012-09-06 2012-09-06 Refrigeration plant Digital Pressure Controller

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Application Number Priority Date Filing Date Title
CN201210330026.3A CN102817822B (en) 2012-09-06 2012-09-06 Refrigeration plant Digital Pressure Controller

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CN102817822B true CN102817822B (en) 2015-10-14

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Citations (4)

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US5150581A (en) * 1991-06-24 1992-09-29 Baltimore Aircoil Company Head pressure controller for air conditioning and refrigeration systems
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JP2006266172A (en) * 2005-03-24 2006-10-05 Denso Corp Compressor displacement control device and refrigeration cycle device
JP5103065B2 (en) * 2007-06-19 2012-12-19 三洋電機株式会社 Control device for refrigerator
JP5627350B2 (en) * 2010-08-31 2014-11-19 三洋電機株式会社 Operation control method for capacity controlled screw refrigeration system

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Publication number Priority date Publication date Assignee Title
US5150581A (en) * 1991-06-24 1992-09-29 Baltimore Aircoil Company Head pressure controller for air conditioning and refrigeration systems
CN1886625A (en) * 2003-11-28 2006-12-27 三菱电机株式会社 Freezer and air contitioner
CN2807316Y (en) * 2005-04-08 2006-08-16 周立德 Pressure controller with digital display
CN201177766Y (en) * 2008-04-24 2009-01-07 上海科系思工业设备有限公司 Electronic pressure controller based on PID control algorithm

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