CN201307232Y

CN201307232Y - A refrigeration dryer controller

Info

Publication number: CN201307232Y
Application number: CNU2008202052782U
Authority: CN
Inventors: 王合洲
Original assignee: GUANGZHOU HANYUE PURIFYING TECHNOLOGY Co Ltd
Current assignee: GUANGZHOU HANYUE PURIFYING TECHNOLOGY Co Ltd
Priority date: 2008-12-15
Filing date: 2008-12-15
Publication date: 2009-09-09
Anticipated expiration: 2018-12-15

Abstract

The utility model discloses a refrigeration dryer controller which comprises a programmable controller, an A/D conversion module, a small man-machine interface, a communication module, an AC contactor, a relay and the like. The controller adopts the programmable controller as the main control unit, uses the small man-machine interface to set operational parameters, monitors the refrigeration dryer and micro-heat adsorption drying operation state, has stable performance and wide application range; the utility model can conveniently realize the automatic control and dew-point energy-saving control of a combined dryer; the system has the functions of refrigerant high pressure, refrigerant low pressure, compressor overload, phase sequence protection, over temperature alarm and low air pressure alarm; meanwhile, the system can conveniently realize host computer communication. The controller can improve the performance of air-compression refrigeration dryer in prior art; the refrigeration dryer controller has the practical characteristics of obvious energy saving effect, simple structure and low cost.

Description

The cooling driers controller

Technical field

The utility model relates to pressurized air purification techniques field, especially a kind of controller of cooling driers.

Background technology

The pressurized air purification industry is to rise gradually and develop industry faster in China in recent years, under the situation of global available resources growing tension, utilize pressurized air as power source general be applied in all trades and professions.Various compressed air purifiers also occur in succession, for cooling driers, the control system of at present domestic combination type drying machines all adopts traditional relay or Single-chip Controlling, and this kind control system exists many shortcomings when using in combination type drying machines:

1, function imperfection: present domestic pressurized air combination type drying machines singlechip controller, do not possess communication function, warning function, remote control function, just has only control function on the spot, the combination type drying machines singlechip controller does not satisfy needs far away in modern industry robotization control, and the indirect pressurized air combination type drying machines production firm that gives brings certain puzzlement.Because singlechip controller does not improve communication function, warning function, remote control function.Pressurized air absorption drier production firm has only tailor-made especially, tailor-made long, the high situation of price of time occurs.

2, maintenance capacity is big: because pressurized air combination type drying machines singlechip controller, no matter which electronic component has problem all must keep in repair, and because China's combination type drying machines is all used singlechip controller at present, this singlechip controller exist anti-ly do a little less than ability, stability is poor, the easily bad situation of I/O input and output and processor CPU is quite serious, so cause also suitable big of the maintenance capacity of singlechip controller.

3, maintenance cost height: because part pressurized air combination type drying machines production firm, do not possess the maintenance condition, so the The whole control case have to be sent back to manufacturer's maintenance, beaming back after maintenance is good, go again to install, so just formed servicing time long, maintenance cost is high, has brought bad negative effect also for pressurized air combination type drying machines production firm.

Summary of the invention

In order to overcome problems and the shortcoming that present domestic cooling driers control system exists, the utility model provides a kind of reliability height, cooling driers controller simple in structure.

The technical scheme that its technical matters that solves the utility model adopts is: this cooling driers controller comprises Programmable Logic Controller, be connected with an analog-to-digital converting module and a miniature man-machine interface on the Programmable Logic Controller, the analog signals input port of analog-to-digital converting module links to each other with condensing temperature sensor, dew point temperature sensor, air inlet thermistor, blow-off port temperature sensor respectively; First to second input port of Programmable Logic Controller links to each other with the low-voltage contact of high and low voltage switch, the high-voltage contact of high and low voltage switch respectively; First to fourth control delivery outlet of Programmable Logic Controller links to each other with first relay to the, four relays respectively; The normally opened contact of the normally opened contact to the of first relay four relays links to each other with A.C. contactor, hot gas bypass valve, No. 1 unloading valve, No. 2 unloading valves respectively, the A.C. contactor main contacts links to each other with compressor, also is built-in with program controling module in the Programmable Logic Controller.

Be provided with one group of normally closed contact that is used to control the compressor well heater on the described A.C. contactor.

Also be in series with overload protective device between the main contacts of described A.C. contactor and the compressor, on the main contacts of A.C. contactor, be parallel with a phase sequence relay; The control contact of described overload protective device, the control contact of phase sequence relay link to each other with the 3rd, the 4th input port of described Programmable Logic Controller respectively.

The the 8th to the tenth input port of described Programmable Logic Controller links to each other with the control contact of oil pressure protection module, the control contact of hydraulic pressure protection module, the control contact of compressor protection module respectively.

The the 5th to the 7th input port of described Programmable Logic Controller respectively with remote activation pilot relay normally opened contact, long-rangely stop the pilot relay normally opened contact, switch links to each other; Described remote activation pilot relay, long-rangely stop control and continue and be connected with remote activation button, long-range stop button respectively on the device.

Described Programmable Logic Controller the 5th to the 8th delivery outlet links to each other with the 5th relay to the eight relays respectively; The normally opened contact of the normally opened contact to the of the 5th relay eight relays links to each other with refrigerant reverse flow valve, No. 1 blowoff valve, No. 2 blowoff valves, No. 3 blowoff valves respectively.

Also be connected with a communication module on the described Programmable Logic Controller.

The the 8th, the 9th control delivery outlet of described Programmable Logic Controller is connected with operation display lamp, fault display lamp respectively.

The beneficial effects of the utility model are: distribution is simple, and the version compactness is attractive in appearance; Maintenance cost is very little, and manufacturing expense is low; The Ethernet networking is easy to operate, the reliability height, and antijamming capability is strong; Comprehensive, perfect in shape and function, applicability is strong; On the cooling driers controller, disposed analog-to-digital converting module, made the cooling driers controller can be more accurate, to the closed-loop control of analog quantitys such as temperature, pressure, flow analog quantity, adopt the PID closed-loop control, dewpoint temperature is accurate, and energy-saving effect is obvious, and is simple to operation etc.

Description of drawings

Fig. 1 is the cooling driers structural representation with the utility model control;

Fig. 2 is the schematic diagram of Programmable Logic Controller of the present utility model;

Fig. 3, the 4th is controlled by the control principle figure of the topworks of Fig. 2 Programmable Logic Controller.

Embodiment

The utility model is described in further detail below in conjunction with drawings and Examples:

As Fig. 1, Fig. 2 and shown in Figure 3, combination type drying machines controller comprises Programmable Logic Controller 21, Programmable Logic Controller 21 is connected with an analog-to-digital converting module 22 and a miniature man-machine interface 23, and the analog signals input port of analog-to-digital converting module 22 links to each other with condensing temperature sensor 15, dew point temperature sensor 16, air inlet thermistor 17, blow-off port temperature sensor 18 respectively; First to the tenth input port X0-X9 of Programmable Logic Controller 21 respectively with the low-voltage contact 71 of high and low voltage switch 7, the high-voltage contact 72 of high and low voltage switch 7, overload protective device normally opened contact FR-1, the control contact XJ-1 of phase sequence relay XJ, the normally opened contact KA9-1 of remote activation pilot relay KA9, the long-range normally opened contact KA10-1 that stops pilot relay KA10, switch SA1, the control contact of oil pressure protection module 103, the control contact of hydraulic pressure protection module 104, the control contact of compressor protection module 105 links to each other; First to the 8th control delivery outlet Y0-Y7 of Programmable Logic Controller 21 links to each other with the first relay K A1 to the, eight relay K A8 respectively, and the 9th, the tenth control delivery outlet Y8, Y9 link to each other with operation display lamp HL1, fault display lamp HL2 respectively.The normally opened contact KA8-1 of normally opened contact KA1-1 to the eight relay K A8 of the first relay K A1 links to each other with A.C. contactor KM1,101, No. 2 unloading valves 102 of 2, No. 1 unloading valve of hot gas bypass valve, 101, No. 2 blowoff valves 102 of 3, No. 1 blowoff valve of refrigerant reverse flow valve respectively; The main contacts of A.C. contactor KM1 links to each other with compressor 1, and Programmable Logic Controller 21 is built-in with a program controling module.The normally opened contact KM1-1 of A.C. contactor KM1 links to each other with compressor well heater 106, also is parallel with a phase sequence relay XJ on the main contacts KM1-1 of A.C. contactor; Remote activation button SB1, long-range stop button SB2 link to each other with remote activation pilot relay KA9, the long-range pilot relay KA10 that stops respectively, also are connected with a communication module 24 on the Programmable Logic Controller Programmable Logic Controller 21 and link to each other with host computer.The first power supply AC, second source DC provide AC power, direct supply respectively, and circuit breaker Q F1 links to each other with the first power supply AC.

The low temperature liquid cold-producing medium evaporator 9 of flowing through, through flashing to gaseous state, the cold-producing medium of gaseous state enters carburetor 8 from evaporator 9 outlets, treat to enter cold medium compressor 1 air entry after micro-liquid refrigerant is gasified totally within it, cold medium compressor 1 is compressed into the gaseous refrigerant of low temperature the gas of High Temperature High Pressure, by the autoregulation of hot gas bypass valve 2, there is fraction gas directly to enter evaporator 9, most gas then enters condenser 4 condensations and cooling by refrigerant reverse flow valve 3.The high pressure low temperature liquid refrigerant that comes out from condenser 4 enters the heating power expansion valve 6 by the throttling step-down by device for drying and filtering 5, becomes low pressure liquid and enters evaporator 9, and cooling has entered the pressurized air of evaporator 9.So, the circulation that goes round and begins again.When high and low voltage switch 7, phase sequence relay XJ, oil pressure protection module 103, hydraulic pressure protection module 104, compressor protection module 105 have the signal input, to handle through Programmable Logic Controller 21, cooling driers is shut down and is reported to the police.According to the signal that dew point temperature sensor 16 detects, Programmable Logic Controller 24 strengthens cooling water flow according to 101, No. 2 load/unload valves 102 of No. 1 load/unload valve of different unblankings, reduces intake air temperature and environment temperature.

Pressurized air is through air intake 19, precooler 11, evaporator 9 precoolings, by moisture trap 10 large quantity of moisture is removed, dry pressurized air carries out heat interchange through precooler 11 and the pressurized air that just enters combination type drying machines, carries out air feed by air out 20 again.When condensing temperature sensor 15, air inlet thermistor 17 or blow-off port temperature sensor 18 detected temperature surpass setting range, the cooling driers stopping alarm.

Claims

1, a kind of cooling driers controller, it is characterized in that described cooling driers controller comprises a Programmable Logic Controller (21), be connected with an analog-to-digital converting module (22) and a miniature man-machine interface (23) on the Programmable Logic Controller (21), the analog signals input port of analog-to-digital converting module (22) links to each other with condensing temperature sensor (15), dew point temperature sensor (16), air inlet thermistor (17), blow-off port temperature sensor (18) respectively; First to second input port (X0-X1) of Programmable Logic Controller (21) links to each other with the low-voltage contact (71) of high and low voltage switch (7), the high-voltage contact (72) of high and low voltage switch (7) respectively; First to fourth control delivery outlet (Y0-Y3) of Programmable Logic Controller (21) links to each other with first relay (KA1) to the 4th relay (KA4) respectively; The normally opened contact (KA1-1) of first relay (KA1) to the normally opened contact (KA4-1) of the 4th relay (KA4) links to each other with A.C. contactor (KM1), hot gas bypass valve (2), No. 1 unloading valve (101), No. 2 unloading valves (102) respectively, A.C. contactor (KM1) main contacts (KM1-1) links to each other with compressor (1), and Programmable Logic Controller also is built-in with program controling module in (21).

2, cooling driers controller according to claim 1 is characterized in that described A.C. contactor (KM1) is provided with one group of normally closed contact (KM1-2) that is used to control compressor well heater (106).

3, cooling driers controller according to claim 1, it is characterized in that also being in series with overload protective device (FR) between the main contacts (KM1-1) of described A.C. contactor (KM1) and the compressor (1), on the main contacts of A.C. contactor (KM1), be parallel with a phase sequence relay (XJ); The control contact (FR-1) of described overload protective device (FR), the control contact (XJ-1) of phase sequence relay (XJ) link to each other with the 3rd, the 4th input port (X2, X3) of described Programmable Logic Controller (21) respectively.

4, cooling driers controller according to claim 1 is characterized in that the 8th to the tenth input port (X7-X9) of described Programmable Logic Controller (21) links to each other with the control contact of oil pressure protection module (103), the control contact of hydraulic pressure protection module (104), the control contact of compressor protection module (105) respectively.

5, cooling driers controller according to claim 1, the 5th to the 7th input port (X4-X6) that it is characterized in that described Programmable Logic Controller (21) respectively with remote activation pilot relay (KA9) normally opened contact (KA9-1), long-rangely stop pilot relay (KA10) normally opened contact (KA10-1), switch (SA1) links to each other; Described remote activation pilot relay (KA9), long-rangely stop control and continue and be connected with remote activation button (SB1), long-range stop button (SB2) respectively on the device (KA10).

6, cooling driers controller according to claim 1 is characterized in that described Programmable Logic Controller the 5th to the 8th delivery outlet (Y4-Y7) links to each other with the 5th relay (KA5) to the 8th relay (KA8) respectively; The normally opened contact (KA8-1) of normally opened contact to the eight relays (KA8) of the 5th relay (KA5) links to each other with refrigerant reverse flow valve (3), No. 1 blowoff valve (12), No. 2 blowoff valves (13), No. 3 blowoff valves (14) respectively.

7, according to described any cooling driers controller of claim 1 to 6, it is characterized in that also being connected with on the described Programmable Logic Controller communication module (24).

8, cooling driers controller according to claim 7 is characterized in that the 8th, the 9th control delivery outlet (Y8, Y9) of described Programmable Logic Controller (21) is connected with operation display lamp (HL1), fault display lamp (HL2) respectively.