CN202747544U - Electric control device for central air-conditioning cold source system - Google Patents
Electric control device for central air-conditioning cold source system Download PDFInfo
- Publication number
- CN202747544U CN202747544U CN 201220401462 CN201220401462U CN202747544U CN 202747544 U CN202747544 U CN 202747544U CN 201220401462 CN201220401462 CN 201220401462 CN 201220401462 U CN201220401462 U CN 201220401462U CN 202747544 U CN202747544 U CN 202747544U
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- cooling
- frequency converter
- water
- freezing
- pressure sensor
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Abstract
The utility model belongs to the field of electric control and provides an electric control device for a central air-conditioning cold source system. The electric control device for the central air-conditioning cold source system comprises three cooling water pumps (8), a cooling system frequency converter (11), three freezing water pumps (4), a freezing system frequency converter (12), a freezing pipeline pressure sensor (10) and a cooling pipeline pressure sensor (9); the three cooling water pumps (8) are positioned at the water outlet end of a condenser of a refrigerating unit (1); the cooling pipeline pressure sensor (9) is communicated with the cooling system frequency converter (11); the three freezing water pumps (4) are positioned at the water outlet end of an evaporator of the refrigerating unit (1); and the freezing pipeline pressure sensor (10) is communicated with the freezing system frequency converter (12). According to the electric control device for the central air-conditioning cold source system, the output frequency can be changed in real time according to the change of an on-site pipeline pressure signal, the electric control device is more flexible and convenient to use, the close loop control of the whole system is realized, and the electric energy is greatly saved.
Description
Technical field
The utility model belongs to the electrical control field, relates generally to a kind of electrical control gear of central air-conditioning cold source system.
Background technology
In conjunction with shown in Figure 1, central air conditioner system includes refrigeration unit 1, cooling water recirculation system 2, the chilled water circulatory system 3; Refrigeration unit 1 is the heart of central air conditioner system, and refrigeration unit 1 comprises refrigeration compressor, condenser, air-cooler, evaporimeter and magnetic valve; Described cooling water recirculation system 2 is connected with the condenser of refrigeration unit 1, realizes the circulation of cooling system, and cooling water pump 8 is set between the water side of cooling water recirculation system 2 and condenser; Described chilled water system 3 is connected with the evaporimeter of refrigeration unit 1, realizes the circulation of refrigeration system; Chilled water pump 4 is set between the water side of chilled water system 3 and evaporimeter; Cryogenic gaseous cold-producing medium R22 becomes high-temperature high-pressure refrigerant gas by the compressed machine compression of the inlet valve of refrigeration compressor, then enters condenser with the heat transferred cooling water, and R22 is condensed into the normal temperature high voltage liquid refrigerant; Remove moisture and impurity from condenser liquid refrigerant drying filter out, become the low-temp low-pressure liquid refrigerant behind the magnetic valve of flowing through, the heating power expansion valve reducing pressure by regulating flow and enter evaporimeter; The heat of low-temp low-pressure liquid refrigerant absorption cycle cold water constantly evaporates in evaporimeter, all becomes the overheated dry flue gas of low-temp low-pressure when arriving evaporator outlet, returns the inlet valve of refrigeration compressor; Cold water after the cooling reaches instructions for use, is discharged by the evaporimeter cooling water outlet; So iterative cycles reaches the refrigeration purpose; Chilled water pump 4 is delivered to chilled water in the cooling coil 5 of each air blower, blows the purpose that cold wind reaches cooling-air by blower fan; The cooling water that cooling water pump 8 will absorb behind the heat is delivered on the cooling tower 6, by blower fan of cooling tower 7 it is carried out spraying cooling, carries out heat exchange with atmosphere; Cooled cooling water is sent to condenser and removes absorption refrigeration agent liberated heat.
The modes that adopt motor Driving Fan water pump to carry out power frequency operation are carried out work more in the prior art, because motor Driving Fan water pump carries out power frequency operation and can't regulate air quantity and flow, when needing low cruise, can't reduce the rotating speed of blower fan water pump, continuous firing year in year out causes the very large waste of electric energy, the cooling evaporation of water has been accelerated in the non-essential power frequency work of cooling blower in addition, causes the waste of enterprise's water resource to cause higher cost to enterprise.
The control of employing manual type; when variations in temperature, open or close corresponding motor by manually-operated; owing to forgetting operation for operating personnel often can appear in manually-operated; make indoor temperature too high or too low; too high cooling water temperature can cause air-conditioner host to be shut down, and affects normal operation and the service life thereof of air-conditioner host.Affect simultaneously indoor temperature, lost the meaning of using air-conditioning.The mode of operation of non intelligentization has taken more human resources.
The utility model content
For solving the problems of the technologies described above, the purpose of this utility model is the electrical control gear that proposes a kind of central air-conditioning cold source system, makes it have operation, easy to maintenance, the characteristics of saves energy.
The utility model adopts following technical scheme for finishing above-mentioned purpose:
A kind of electrical control gear of central air-conditioning cold source system, described electrical control gear include cooling water pump, cooling system frequency converter, chilled water pump, refrigeration system frequency converter, freezing pipeline pressure transmitter and cooling pipe pressure sensor; Described cooling water pump is three that are arranged in parallel, and three described cooling water pumps are positioned at the water side of refrigeration unit condenser; Described cooling pipe pressure sensor is two, is separately positioned on water inlet end and the water side of refrigeration unit condenser; Be positioned at the water inlet end of refrigeration unit condenser, two described cooling pipe pressure sensors of water side are connected with the cooling system frequency converter, formation is in order to controlling the pressure differential in the cooling pipe by the cooling system frequency converter, thereby the method for operation of three cooling water pumps is controlled the structure of carrying out speed governing; Described chilled water pump is three that are arranged in parallel, and three described cooling water pumps are positioned at the water side of refrigeration unit evaporimeter; Described freezing pipe pressure sensor is two, is separately positioned on water inlet end and the water side of refrigeration unit evaporimeter; Be positioned at the water inlet end of refrigeration unit evaporimeter, two described freezing pipe pressure sensors of water side are connected with the refrigeration system frequency converter, formation is in order to controlling the pressure differential in the freezing pipeline by the refrigeration system frequency converter, thereby the method for operation of three chilled water pumps is controlled the structure of carrying out speed governing.
The electrical control gear of a kind of central air-conditioning cold source system that the utility model proposes, electrical control gear are responsible for Power supply, power drive, signal detection and the transfer function of whole system, and change the running frequency of real time altering motor by detection signal; Adopt the transducer drive motor, 2 analog inputs can according to its output frequency of variation real time altering of on-the-spot pipeline pressure signal, use more flexible, convenient; Adopts pressure sensor detects, and fast, accurately calculates pressure differential in the pipeline by PLC, and the motor signal is given frequency converter accurately.Realize the closed-loop control of whole system, greatly saved electric energy simultaneously.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Among the figure: 1, refrigeration unit, 2, cooling water recirculation system, 3, the chilled water circulatory system, 4, chilled water pump, 5, cooling coil, 6, cooling tower, 7, blower fan of cooling tower, 8, cooling water pump, 9, cooling pipe pressure sensor, 10, freezing pipe pressure sensor, 11, the cooling system frequency converter, 12, the refrigeration system frequency converter.
The specific embodiment
With specific embodiment the utility model is illustrated by reference to the accompanying drawings:
As shown in Figure 1, a kind of electrical control gear of central air-conditioning cold source system, described electrical control gear include cooling water pump 8, cooling system frequency converter 11, chilled water pump 4, refrigeration system frequency converter 12, freezing pipe pressure sensor 10 and cooling pipe pressure transmitter 9; Described cooling water pump 8 is three that are arranged in parallel, and three described cooling water pumps 8 are positioned at the water side of refrigeration unit 1 condenser; Described cooling pipe pressure sensor 9 is two, is separately positioned on water inlet end and the water side of refrigeration unit 1 condenser; Be positioned at refrigeration unit 1 condenser water inlet end, two described cooling pipe pressure sensors 9 of water side are connected with cooling system frequency converter 11, utilize the pressure of 9 pairs of refrigeration unit of cooling pipe pressure sensor, 1 condenser water inlet end and water side to gather, and signal sent into cooling system frequency converter 11, the pressure differential of cooling system frequency converter 11 in the cooling pipe is as foundation, carry out the constant-pressure drop operation by frequency control, in the cooling water recirculation system in building, when turning off the cooling water pipeline of part floor, total pipe resistance also must increase, cause room temperature to descend, if by frequency control, make pressure reduction keep constant, the cooling water flow that does not then close floor will remain unchanged, thereby room temperature can not change yet.
Described chilled water pump 4 is three that are arranged in parallel, and three described cooling water pumps 4 are positioned at the water side of refrigeration unit 1 evaporimeter; Described freezing pipe pressure sensor 10 is two, is separately positioned on water inlet end and the water side of refrigeration unit 1 evaporimeter; Be positioned at the water inlet end of refrigeration unit 1 evaporimeter, two described freezing pipe pressure sensors 10 of water side are connected with refrigeration system frequency converter 12, utilize the pressure of 10 pairs of refrigeration unit of freezing pipe pressure sensor, 1 evaporimeter water inlet end and water side to gather, and signal sent into refrigeration system frequency converter 12, the pressure differential of refrigeration system frequency converter 12 in the freezing pipeline is as foundation, carry out the constant-pressure drop operation by frequency control, in the chilled water circulatory system in building, when turning off the chilled water pipeline of part floor, total pipe resistance also must increase, cause room temperature to descend, if by frequency control, make pressure reduction keep constant, the chilled-water flow that does not then close floor will remain unchanged, thereby room temperature can not change yet.Control, thereby the method for operation of three chilled water pumps is controlled the structure of carrying out speed governing.
The chilled water circulatory system is the control device of central air-conditioning cold source system, control mode is VFC, three chilled water pumps of refrigeration system Frequency Converter Control are controlled adding pump, subtracting pump of three chilled water pumps according to the system pressure signal, thus control signal sensitive reliably realized energy-conservation.Its main processes is:
Three chilled water pumps all can adopt separately star delta reduced-voltage starting mode to start, separate unit or many while power frequency operations; If three chilled water pumps are respectively 1# pump, 2# pump and 3# pump, the course of work is as follows:
Refrigeration unit provides the refrigeration system enabling signal after starting, and the 1# pump is started operation by the refrigeration system frequency converter, pressure sensor acquisition system pressure signal, if pressure satisfies system requirements, then the 1# pump continues operation; If pressure can not satisfy system requirements, operating frequency has reached 50HZ, in order to reduce the impact to system as far as possible, the 1# pump is switched to power frequency operation, then by frequency converter with the 2# pump startup, refrigeration system is in the running status of " power frequency one frequency conversion "; Operating frequency such as frequency converter reaches again 50HZ, and pressure in order to reduce the impact to system as far as possible, also switches to power frequency operation with the 2# pump when still not enough, then by frequency converter with the 3# pump startup, chilled water system is in the running status of " one frequency conversion of two power frequencies ".
Otherwise when if pressure is higher than system requirements, the operating frequency of frequency converter has been down to lower frequency limit, then makes the 1# pump shut down, and chilled water system is in again the running status of " power frequency one frequency conversion "; If the operating frequency of frequency converter drops to again lower frequency limit, and system pressure then makes the 2# pump also shut down when still higher, and chilled water system is returned to again the state of a pump frequency conversion operation, has so more uniform advantage of the working time that makes 3 pumps.
The operation principle of cooling water recirculation system is not done too much explanation with the operation principle of the chilled water circulatory system at this.
Claims (1)
1. the electrical control gear of a central air-conditioning cold source system, it is characterized in that: described electrical control gear includes cooling water pump (8), cooling system frequency converter (11), chilled water pump (4), refrigeration system frequency converter (12), freezing pipe pressure sensor (10) and cooling pipe pressure sensor (9); Described cooling water pump (8) is three that are arranged in parallel, and three described cooling water pumps (8) are positioned at the water side of refrigeration unit (1) condenser; Described cooling pipe pressure sensor (9) is two, is separately positioned on water inlet end and the water side of refrigeration unit (1) condenser; Two the described cooling pipe pressure sensors (9) that are positioned at refrigeration unit (1) condenser water inlet end, water side are connected with cooling system frequency converter (11), formation is in order to control the pressure differential in the freezing pipeline by cooling system frequency converter (11), to three described cooling water pumps (8) thus the method for operation control the structure of carrying out speed governing; Described chilled water pump (4) is three that are arranged in parallel, and three described cooling water pumps (4) are positioned at the water side of refrigeration unit (1) evaporimeter; Described freezing pipe pressure sensor (10) is two, is separately positioned on water inlet end and the water side of refrigeration unit (1) evaporimeter; Be positioned at the water inlet end of refrigeration unit (1) evaporimeter, two described freezing pipe pressure sensors (10) of water side are connected with refrigeration system frequency converter (12), formation is in order to controlling the pressure differential in the freezing pipeline by refrigeration system frequency converter (12), thereby the method for operation of three chilled water pumps is controlled the structure of carrying out speed governing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220401462 CN202747544U (en) | 2012-08-08 | 2012-08-08 | Electric control device for central air-conditioning cold source system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220401462 CN202747544U (en) | 2012-08-08 | 2012-08-08 | Electric control device for central air-conditioning cold source system |
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| Publication Number | Publication Date |
|---|---|
| CN202747544U true CN202747544U (en) | 2013-02-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220401462 Expired - Fee Related CN202747544U (en) | 2012-08-08 | 2012-08-08 | Electric control device for central air-conditioning cold source system |
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| CN (1) | CN202747544U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107166597A (en) * | 2017-06-30 | 2017-09-15 | 宁波钱创节能科技有限公司 | A kind of energy-saving air central |
-
2012
- 2012-08-08 CN CN 201220401462 patent/CN202747544U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107166597A (en) * | 2017-06-30 | 2017-09-15 | 宁波钱创节能科技有限公司 | A kind of energy-saving air central |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130220 Termination date: 20150808 |
|
| EXPY | Termination of patent right or utility model |