CN212274338U - Magnetic suspension centrifugal water chilling unit control system - Google Patents
Magnetic suspension centrifugal water chilling unit control system Download PDFInfo
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- CN212274338U CN212274338U CN202021076942.5U CN202021076942U CN212274338U CN 212274338 U CN212274338 U CN 212274338U CN 202021076942 U CN202021076942 U CN 202021076942U CN 212274338 U CN212274338 U CN 212274338U
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Abstract
The utility model belongs to the technical field of centrifugal chiller, in particular to a magnetic suspension centrifugal chiller control system, which comprises a control unit and an operation unit, wherein the control unit is used for controlling and adjusting the magnetic suspension centrifugal chiller, and the operation unit is used for operating the control unit; the control unit comprises a control cabinet, a main motor starting cabinet, a plurality of transmitters and sensors, the transmitters are used for connecting the control cabinet with the sensors one by one, and the control cabinet is used for controlling all parameters in the magnetic suspension centrifugal chiller. The control system can solve the problems that the control of the magnetic suspension centrifugal chiller unit in the prior art is decentralized, the operation of operators is inconvenient, and the magnetic suspension centrifugal chiller unit is difficult to operate in an ideal and safe state all the time.
Description
Technical Field
The utility model belongs to the technical field of centrifugal chiller, especially, relate to a centrifugal chiller control system of magnetic suspension.
Background
The centrifugal water chilling unit uses electricity as a power source, the Freon refrigerant evaporates in the evaporator to absorb the heat of secondary refrigerant water for refrigeration, Freon wet steam after evaporation and heat absorption is compressed into high-temperature and high-pressure gas by the compressor, the gas is condensed by the water-cooled condenser to become liquid, and the liquid flows through the throttling orifice plate and enters the evaporator for recirculation. Thus preparing the chilled water with the temperature of 7-12 ℃ for air conditioning at the tail end of the air conditioner.
The magnetic suspension centrifugal water chilling unit mainly comprises a magnetic suspension centrifugal compressor, a main motor, an evaporator, a condenser, a throttling device (such as a throttling valve) and the like. The core of the magnetic suspension centrifugal water chilling unit is a magnetic suspension centrifugal compressor which mainly comprises an impeller, a motor, a magnetic suspension bearing, a displacement sensor, a bearing controller, a motor driver and the like.
At present, the control of the magnetic suspension centrifugal water chilling unit is also very decentralized, the operation of operators is inconvenient, and the magnetic suspension centrifugal water chilling unit is difficult to operate in an ideal and safe state all the time.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a centrifugal cooling water set control system of magnetic suspension to solve among the prior art still very the decentralization to the control of the centrifugal cooling water set of magnetic suspension, operating personnel operates inconveniently, and be difficult to make the centrifugal cooling water set of magnetic suspension be in the problem of operation under the state of ideal safety all the time.
In order to achieve the above purpose, the technical scheme of the utility model is that: a magnetic suspension centrifugal chiller control system comprises a control unit and an operation unit, wherein the control unit is used for controlling and adjusting the magnetic suspension centrifugal chiller, and the operation unit is used for operating the control unit; the control unit comprises a control cabinet, a main motor starting cabinet, a plurality of transmitters and sensors, the transmitters are used for connecting the control cabinet with the sensors one by one, and the control cabinet is used for controlling each parameter in the magnetic suspension centrifugal chiller; the main motor starting cabinet is used for controlling a main motor of the magnetic suspension centrifugal type water chilling unit.
Furthermore, the guide vanes in the magnetic suspension centrifugal chiller are driven to open and close by an electric actuator, and the electric actuator is controlled by a control cabinet.
Further, the control cabinet is used for controlling the guide vanes to be opened and closed, and the control modes comprise an automatic control mode, a given control mode and a manual control mode; the automatic control mode is that the guide vanes are automatically controlled to be opened and closed according to the outlet temperature of the chilled water and the set PID parameters, and the refrigerating capacity of the refrigerating machine is adjusted, so that the outlet temperature of the chilled water is constant at the set target temperature; the given control mode sets a given value through an operation unit, so that the guide vane is automatically opened and closed to the given value; the manual control mode can be used for manually controlling the opening degree of the guide vane.
Further, a bypass valve of the magnetic suspension centrifugal chiller is controlled by a control cabinet, and if the opening degree of the guide vane is smaller than that of the adjacent guide vane and the outlet temperature of the chilled water is lower than the critical temperature, the control cabinet opens the bypass valve; otherwise the bypass valve is closed.
Further, a first-stage throttle valve of the magnetic suspension centrifugal chiller is used for adjusting an intermediate pressure value, and a second-stage throttle valve is used for adjusting an evaporation pressure value; the control cabinet is used for controlling the intermediate pressure value to be always larger than a value obtained by multiplying the condensation pressure value by the evaporation pressure value and taking the value as an integral, and the opening degree of the primary throttle valve cannot be lower than a set minimum value; the control cabinet is used for controlling the liquid level of the evaporator to be always kept in a set liquid level difference range, and the opening degree of the secondary throttling valve cannot be lower than a set minimum value.
The compressor of the magnetic suspension centrifugal water chilling unit is a three-stage compressor, and the intermediate pressure value refers to the pressure value of the second-stage compression part.
Further, the control cabinet is used for controlling the intermediate pressure value to be 80-120 kPa higher than the value obtained by multiplying the condensation pressure value by the evaporation pressure value.
Further, the temperature of a permanent magnet motor of the magnetic suspension centrifugal chiller is controlled by a motor cooling expansion valve, and the temperature of a frequency converter is controlled by a frequency converter cooling expansion valve; the motor cooling expansion valve is used for ensuring that the temperature of the permanent magnet motor always runs in a set temperature range, and the control cabinet is used for controlling the opening degree of the motor cooling expansion valve to be not lower than a set minimum value; the frequency converter cooling expansion valve adopts manual adjustment to ensure that the temperature of the frequency converter runs in a set temperature range, and the control cabinet is used for controlling the opening degree of the frequency converter cooling expansion valve not to be lower than a set minimum value.
Further, the operation unit adopts a touch type graphic display.
Further, the display lattice of the touch type graphic display is 640 × 480 touches.
The beneficial effects of this technical scheme lie in: touch graphic displays make the operation interface more convenient. Secondly, the control cabinet is used for carrying out unified control, the modularization degree is higher, and meanwhile, the maintenance is convenient.
Drawings
Fig. 1 is a structural connection diagram of a magnetic suspension centrifugal chiller control system of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the control system comprises a control unit 1, an operation unit 2, a main motor starting cabinet 3, a sensor 4, a transmitter 5, a control cabinet 6, a main motor 7, an electric actuator 8, a guide vane 9, a bypass valve 10, a primary throttle valve 11, a secondary throttle valve 12, a motor cooling expansion valve 13, a frequency converter cooling expansion valve 14 and a magnetic suspension centrifugal water chilling unit 15.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The embodiment is basically as shown in the attached figure 1: a magnetic suspension centrifugal chiller control system comprises a control unit 1 and an operation unit 2, wherein the control unit 1 is used for controlling and adjusting a magnetic suspension centrifugal chiller 15, and the operation unit 2 is used for operating the control unit 1; the control unit 1 comprises a control cabinet 6, a main motor starting cabinet 3 and a plurality of transmitters 5 and sensors 4, wherein the transmitters 5 connect the control cabinet 6 with the sensors 4 one by one, and the control cabinet 6 is used for controlling all parameters in the magnetic suspension centrifugal water chilling unit 15. The guide vanes 9 in the magnetic suspension centrifugal water chilling unit 15 are driven to open and close by an electric actuator 8, and the electric actuator 8 is controlled by a control cabinet 6. The main motor starting cabinet 3 is used for controlling a main motor 7 of a magnetic suspension centrifugal type water chilling unit 15
The control cabinet 6 is used for controlling the opening and closing of the guide vanes 9, and the control modes comprise an automatic control mode, a given control mode and a manual control mode; the automatic control mode is that the guide vanes 9 are automatically controlled to be opened and closed according to the outlet temperature of the chilled water and set PID parameters, and the refrigerating capacity of the refrigerating machine is adjusted to ensure that the outlet temperature of the chilled water is constant at the set target temperature; the given control mode sets a given value through the operation unit 2, so that the guide vane 9 is automatically opened and closed to the given value; the manual control manner enables the opening degree of the guide vane 9 to be manually controlled. During the trial run after the initial installation and the overhaul or under the conditions that the opening degree of the guide vane 9 and the current measuring circuit have faults and the like, the opening degree of the guide vane 9 can be manually controlled, the refrigerating capacity can be adjusted, and the non-stop overhaul is realized.
A bypass valve 10 of the magnetic suspension centrifugal water chilling unit 15 is controlled by the control cabinet 6, and if the opening degree of the guide vane 9 is smaller than that of the adjacent guide vane 9 and the outlet temperature of the chilled water is lower than the critical temperature, the control cabinet 6 opens the bypass valve 10; otherwise the bypass valve 10 is closed.
The primary throttling valve 11 of the magnetic suspension centrifugal chiller 15 is used for adjusting an intermediate pressure value (the compressor of the magnetic suspension centrifugal chiller 15 is a three-stage compressor, the intermediate pressure value refers to the pressure value of the second-stage compression part), and the secondary throttling valve 12 is used for adjusting an evaporation pressure value; the control cabinet 6 is used for controlling the middle pressure value to be always higher than the value obtained by multiplying the condensation pressure value by the evaporation pressure value and then being increased by 80 kPa-120 kPa, and the opening degree of the first-stage throttle valve 11 cannot be lower than the set minimum value; the control cabinet 6 is used for controlling the liquid level of the evaporator to be always kept within a set liquid level difference range, and the opening degree of the two-stage throttle valve 12 cannot be lower than a set minimum value.
The temperature of a permanent magnet motor of the magnetic suspension centrifugal water chilling unit 15 is controlled by a motor cooling expansion valve 13, and the temperature of a frequency converter is controlled by a frequency converter cooling expansion valve 14; the motor cooling expansion valve 13 is used for ensuring that the temperature of the permanent magnet motor always runs in a set temperature range, and the control cabinet 6 is used for controlling the opening degree of the motor cooling expansion valve 13 to be not lower than a set minimum value; the frequency converter cooling expansion valve 14 adopts manual adjustment to ensure that the temperature of the frequency converter runs in a set temperature range, and the control cabinet 6 is used for controlling the opening degree of the frequency converter cooling expansion valve 14 not to be lower than a set minimum value.
The operation unit 2 adopts a touch type graphic display, and the display lattice of the touch type graphic display is 640 × 480. In this embodiment, a GP-4502 type touch graphic display manufactured by DIGTOL corporation of Japan is used.
The control cabinet 6 in the embodiment adopts an S7-1200 series programmable controller produced by SIEMENS.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The above description is only for the embodiments of the present invention, and the common general knowledge of the known specific structures and characteristics in the schemes is not described herein too much, and those skilled in the art will know all the common technical knowledge in the technical field of the present invention before the application date or the priority date, can know all the prior art in this field, and have the ability to apply the conventional experimental means before this date, and those skilled in the art can combine their own ability to perfect and implement the schemes, and some typical known structures or known methods should not become obstacles for those skilled in the art to implement the present application. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (9)
1. A magnetic suspension centrifugal chiller control system is characterized in that: the magnetic suspension centrifugal water chilling unit comprises a control unit and an operation unit, wherein the control unit is used for controlling and adjusting the magnetic suspension centrifugal water chilling unit, and the operation unit is used for operating the control unit; the control unit comprises a control cabinet, a main motor starting cabinet, a plurality of transmitters and sensors, the transmitters are used for connecting the control cabinet with the sensors one by one, and the control cabinet is used for controlling each parameter in the magnetic suspension centrifugal chiller; the main motor starting cabinet is used for controlling a main motor of the magnetic suspension centrifugal type water chilling unit.
2. A magnetic levitation centrifugal chiller control system as claimed in claim 1 wherein: the opening and closing of guide vanes in the magnetic suspension centrifugal water chilling unit are driven by an electric actuator, and the electric actuator is controlled by a control cabinet.
3. A magnetic levitation centrifugal chiller control system as claimed in claim 1 wherein: the control cabinet is used for controlling the guide vanes to be opened and closed, and the control modes comprise an automatic control mode, a given control mode and a manual control mode; the automatic control mode is that the guide vanes are automatically controlled to be opened and closed according to the outlet temperature of the chilled water and the set PID parameters, and the refrigerating capacity of the refrigerating machine is adjusted, so that the outlet temperature of the chilled water is constant at the set target temperature; the given control mode sets a given value through an operation unit, so that the guide vane is automatically opened and closed to the given value; the manual control mode can be used for manually controlling the opening degree of the guide vane.
4. A magnetic levitation centrifugal chiller control system as claimed in claim 1 wherein: the bypass valve of the magnetic suspension centrifugal chiller is controlled by a control cabinet, and if the opening of the guide vane is smaller than the opening of the adjacent guide vane and the outlet temperature of the chilled water is lower than the critical temperature, the control cabinet opens the bypass valve; otherwise the bypass valve is closed.
5. A magnetic levitation centrifugal chiller control system as claimed in claim 1 wherein: the primary throttle valve of the magnetic suspension centrifugal water chilling unit is used for adjusting the intermediate pressure value, and the secondary throttle valve is used for adjusting the evaporation pressure value; the control cabinet is used for controlling the intermediate pressure value to be always larger than a value obtained by multiplying the condensation pressure value by the evaporation pressure value and taking the value as an integral, and the opening degree of the primary throttle valve cannot be lower than a set minimum value; the control cabinet is used for controlling the liquid level of the evaporator to be always kept in a set liquid level difference range, and the opening degree of the secondary throttling valve cannot be lower than a set minimum value.
6. A control system for a magnetically levitated centrifugal chiller as set forth in claim 5, wherein: the control cabinet is used for controlling the middle pressure value to be always higher than the value obtained by multiplying the condensation pressure value by the evaporation pressure value by 80-120 kPa.
7. A magnetic levitation centrifugal chiller control system as claimed in claim 1 wherein: the temperature of a permanent magnet motor of the magnetic suspension centrifugal water chilling unit is controlled by a motor cooling expansion valve, and the temperature of a frequency converter is controlled by a frequency converter cooling expansion valve; the motor cooling expansion valve is used for ensuring that the temperature of the permanent magnet motor always runs in a set temperature range, and the control cabinet is used for controlling the opening degree of the motor cooling expansion valve to be not lower than a set minimum value; the frequency converter cooling expansion valve adopts manual adjustment to ensure that the temperature of the frequency converter runs in a set temperature range, and the control cabinet is used for controlling the opening degree of the frequency converter cooling expansion valve not to be lower than a set minimum value.
8. A magnetic levitation centrifugal chiller control system as claimed in claim 1 wherein: the operation unit adopts a touch type graphic display.
9. A magnetic levitation centrifugal chiller control system as recited in claim 8 wherein: the display lattice of the touch type graphic display is 640 × 480 touches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021076942.5U CN212274338U (en) | 2020-06-12 | 2020-06-12 | Magnetic suspension centrifugal water chilling unit control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021076942.5U CN212274338U (en) | 2020-06-12 | 2020-06-12 | Magnetic suspension centrifugal water chilling unit control system |
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| CN212274338U true CN212274338U (en) | 2021-01-01 |
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| CN202021076942.5U Active CN212274338U (en) | 2020-06-12 | 2020-06-12 | Magnetic suspension centrifugal water chilling unit control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115200177A (en) * | 2022-05-27 | 2022-10-18 | 宁波奥克斯电气股份有限公司 | Air supplementing enthalpy increasing control method and device and air conditioner |
-
2020
- 2020-06-12 CN CN202021076942.5U patent/CN212274338U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115200177A (en) * | 2022-05-27 | 2022-10-18 | 宁波奥克斯电气股份有限公司 | Air supplementing enthalpy increasing control method and device and air conditioner |
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