CN216080566U - Chilled water constant pressure control system and water supply system - Google Patents
Chilled water constant pressure control system and water supply system Download PDFInfo
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- CN216080566U CN216080566U CN202121932363.0U CN202121932363U CN216080566U CN 216080566 U CN216080566 U CN 216080566U CN 202121932363 U CN202121932363 U CN 202121932363U CN 216080566 U CN216080566 U CN 216080566U
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Abstract
The utility model relates to a water supply control system, and particularly discloses a chilled water constant pressure control system which comprises a motor (1), a pumping device (2) connected with the motor (1), a pressure sensor (3) arranged at the outlet end of the pumping device (2), and a frequency converter (4) connected with the motor (1) and the pressure sensor (3), wherein the motor (1), the pumping device (2), the pressure sensor (3) and the frequency converter (4) form a closed-loop control circuit so that the motor (1) can be controlled through the frequency converter (4) according to a pressure signal detected by the pressure sensor (3). In addition, the utility model also discloses a water supply system. Utility model's refrigerated water constant voltage control system simple structure, the simple operation, water pressure is stable, excellent in use effect.
Description
Technical Field
The utility model relates to a water supply control system, in particular to a chilled water constant pressure control system. Furthermore, the utility model relates to a water supply system.
Background
The existing water chilling unit in a system such as a refrigerator, a heat exchanger unit, a pure water system or a soft water system comprises a freezing water pump or a cooling water pump and the like, wherein the freezing water pump or the cooling water pump belongs to a frequency converter fixed-frequency operation state, the pressure and the flow in a pipeline connected with the freezing water pump or the cooling water pump are adjusted by manually adjusting the frequency of the frequency converter and controlling the opening of a valve.
In addition, due to special requirements of the industry, the production workshop has extremely high requirements on the field environment, the temperature and the humidity of the main production workshop can be directly influenced by slight change of the chilled water pressure, and the automatic pressure stabilizing device of the water chilling unit system has low adjusting speed and poor pressure control effect in a pipeline, so that the environmental influence on the production workshop is large.
Therefore, there is a need to design a chilled water constant pressure control system to solve or overcome the above technical problems.
SUMMERY OF THE UTILITY MODEL
In view of the above, the technical problem to be solved by the present invention is to provide a chilled water constant pressure control system, which has a simple structure, can effectively control the pressure in a pipeline to be constant, and has a good use effect.
In addition, the technical problem to be solved by the utility model is to provide a water supply system, wherein the chilled water constant pressure control system in the water supply system has a simple structure, can effectively control the pressure in the pipeline to be constant, and has a good use effect.
In order to solve the above technical problems, an aspect of the present invention provides a chilled water constant pressure control system, which includes a motor, a pumping device connected to the motor, a pressure sensor disposed at an outlet end of the pumping device, and a frequency converter connected to the motor and the pressure sensor, wherein the motor, the pumping device, the pressure sensor, and the frequency converter form a closed-loop control circuit, so that the motor can be controlled by the frequency converter according to a pressure signal detected by the pressure sensor.
In a preferred embodiment of the present invention, the three-phase power input terminals of the inverter are connected to the line L1, the line L2, and the line L3, respectively, and the three-phase output terminals of the inverter are connected to the motor.
As another preferred embodiment of the present invention, the common terminal of the frequency converter is connected to the analog common terminal.
More preferably, the analog input end of the frequency converter is connected with the pressure sensor.
As still another preferred embodiment of the present invention, the pressure sensor is a pressure transmitter.
Further preferably, the frequency converter controls the rotating speed or rotating frequency of the motor by adopting a PID control mechanism according to the pressure signal of the pressure sensor.
As a specific structural form of the present invention, a filter is connected to a signal transmission circuit between the pressure sensor and the frequency converter.
More specifically, the pressure sensor is connected to an outlet line of the pumping device via a detection line.
As another specific configuration form of the present invention, the line L1, the line L2, and the line L3 are provided with a changeover switch.
In addition, the utility model also provides a water supply system, which comprises the chilled water constant pressure control system according to any one of the technical schemes.
Through the technical scheme, the utility model has the following beneficial effects:
in the chilled water constant pressure control system, the motor, the pumping device, the pressure sensor and the frequency converter are connected to form a closed-loop control circuit, and the pressure sensor and the frequency converter connected with the motor and the pressure sensor are arranged at the outlet end of the pumping device, so that the motor can be controlled by the frequency converter according to a pressure signal detected by the pressure sensor, the water pressure in a pipeline is constant, the production is stable, meanwhile, the motor can be started and stopped stably, the impact on the motor and the pumping device is reduced, and the service lives of the motor and the pumping device are prolonged.
Through the technical scheme, the chilled water constant-pressure control system comprises a motor, a pumping device connected with the motor, a pressure sensor arranged at the outlet end of the pumping device and a frequency converter connected with the motor and the pressure sensor, wherein the motor, the pumping device, the pressure sensor and the frequency converter form a closed-loop control circuit so that the motor can be controlled through the frequency converter according to a pressure signal detected by the pressure sensor. According to the chilled water constant pressure control system, the motor, the pumping device, the pressure sensor and the frequency converter are connected to form a closed-loop control circuit, and the pressure sensor and the frequency converter connected with the motor and the pressure sensor are arranged at the outlet end of the pumping device, so that the constant operation of water pressure in a pipeline is ensured, and the chilled water constant pressure control system is simple in structure and good in constant pressure effect.
Additional features and advantages of the utility model will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:
FIG. 1 is a schematic structural diagram of one embodiment of a chilled water constant pressure control system according to the present invention;
fig. 2 is a PID process schematic of the frequency converter of the present invention.
Description of the reference numerals
1 electric machine
2 pumping device
3 pressure sensor
4 frequency converter
Detailed Description
The following detailed description of embodiments of the utility model refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "disposed" or "connected" are to be construed broadly, e.g., the term "connected" may be a fixed connection, a detachable connection, or an integral connection; either directly or indirectly through intervening media, either internally or in any combination thereof. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1 and 2, in one aspect, the present invention provides a chilled water constant pressure control system, which includes a motor 1, a pumping device 2 connected to the motor 1, a pressure sensor 3 disposed at an outlet end of the pumping device 2, and a frequency converter 4 connected to the motor 1 and the pressure sensor 3, wherein the motor 1, the pumping device 2, the pressure sensor 3, and the frequency converter 4 form a closed-loop control circuit, so that the motor 1 can be controlled by the frequency converter 4 according to a pressure signal detected by the pressure sensor 3.
In the utility model, the motor 1, the pumping device 2, the pressure sensor 3 and the frequency converter 4 form a closed-loop control circuit, the pressure sensor 3 is arranged at the outlet end of the pumping device 2, the rotating speed of the motor 1 is adjusted through PID control (closed-loop control) of the frequency converter 4, the pressure at the outlet end of the pumping device 2 fed back by the pressure sensor 3 is detected at the same time, and the rotating speed of the motor 1 is controlled by the frequency converter 4 by utilizing the fed-back pressure signal, so that the pressure at the outlet end of the pumping device 2 can be effectively adjusted, and the aim of adjusting the pressure in the whole pipeline is fulfilled.
The control process of the chilled water constant pressure control system comprises the following steps: first, a rated pressure value is set. Secondly, when the pressure sensor 3 detects that the pressure at the outlet end of the pumping device 2 reaches a rated pressure value, the frequency converter 4 controls the motor 1 to operate at a constant speed; when the pressure sensor 3 detects that the pressure at the outlet end of the pumping device 2 is lower than or higher than the rated pressure value, the frequency converter 4 controls the motor 1 to run in an accelerating or decelerating mode, so that the pressure at the outlet end of the pumping device 2 is equal to the set pressure value, the purpose of constant pressure is achieved, the electric energy is saved, and the service life of mechanical equipment is prolonged.
It should be noted here that the frequency converter 4 of the present invention can control the rotation speed of the motor 1 according to the pressure signal fed back by the pressure sensor 3, so as to meet the requirement that the pressure at the outlet end of the pumping device 2 is equal to the set pressure value, so as to realize pressure constant control for twenty-four hours and reduce energy consumption, and after the pumping device 2 realizes frequency conversion control, a single motor 1 can realize 10000 degrees electricity/month of energy saving, and the energy saving effect is good. In addition, after the pumping device 2 realizes frequency conversion control, the pipeline realizes constant pressure control, the rotating speed of the motor 1 is automatically regulated through the frequency converter 4, the constant pressure output of liquid (such as chilled water and the like) in the pipeline is realized, and the stable production is further ensured. Moreover, after the pumping device 2 realizes frequency conversion control, the motor 1 is stable in starting and stopping, and the phenomenon of water hammer in a traditional pipeline can be effectively avoided.
In a preferred embodiment of the present invention, the three-phase power input terminals R, S, T of the inverter 4 are connected to the line L1, the line L2, and the line L3, respectively, and the three-phase output terminals U, V, W of the inverter 4 are connected to the motor 1.
For a person skilled in the art, the frequency converter belongs to a device commonly used in the field of frequency conversion, and as another preferred embodiment of the present invention, the common terminal COM of the frequency converter 4 is connected to the analog quantity common terminal GND.
In a further preferred embodiment of the present invention, the analog input P24 and AI2 of the frequency converter 4 are connected to the pressure sensor 3.
In some embodiments of the present invention, as shown in fig. 1, the frequency converter 4 has three-phase power input terminals R, S, T, and three-phase output terminals U, V, W connected to the line L1, the line L2, and the line L3, and the three-phase output terminals U, V, W are connected to the motor 1, and the frequency converter 4 further has a common terminal COM, an external power input terminal PW, an analog input terminal P24, a ground terminal PE, an analog input terminal AI2, and an analog common terminal GND sequentially disposed thereon, wherein the common terminal COM is connected to the analog common terminal GND, the analog input terminal P24 and the analog input terminal AI2 are both connected to the pressure sensor 3, and the pressure sensor 3 is disposed at an outlet end of the pumping device 2 for detecting a pressure value at an outlet end of the pumping device 2.
Preferably, the pressure sensor 3 is a pressure transmitter.
More preferably, the frequency converter 4 controls the rotation speed or rotation frequency of the motor 1 by using a PID control mechanism according to the pressure signal of the pressure sensor 3.
As a specific structural form of the present invention, a filter is connected to the signal transmission circuit between the pressure sensor 3 and the frequency converter 4, so as to effectively filter a frequency point of a specific frequency in the power line or frequencies other than the frequency point, and obtain a power signal of the specific frequency or eliminate a power signal of the specific frequency. By using the frequency selection function of the filter, the interference noise can be filtered out or the frequency spectrum analysis can be carried out.
As another specific structure form of the present invention, the pressure sensor 3 is connected to the outlet pipeline of the pumping device 2 via a detection pipeline, and the length of the detection pipeline is set according to actual production and installation requirements.
As a further specific structural form of the present invention, the line L1, the line L2, and the line L3 are provided with switches for controlling the opening and closing of various circuits in the system.
In addition, the utility model also provides a water supply system, which comprises the chilled water constant pressure control system according to any one of the technical schemes.
According to the technical scheme, the chilled water constant pressure control system comprises a motor 1, a pumping device 2 connected with the motor 1, a pressure sensor 3 arranged at the outlet end of the pumping device 2 and a frequency converter 4 connected with the motor 1 and the pressure sensor 3, wherein the motor 1, the pumping device 2, the pressure sensor 3 and the frequency converter 4 form a closed-loop control circuit, so that the motor 1 can be controlled through the frequency converter 4 according to a pressure signal detected by the pressure sensor 3.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the utility model. The utility model is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. The utility model provides a refrigerated water constant voltage control system, its characterized in that, including motor (1), with pumping device (2) that motor (1) is connected, locate pumping device's (2) exit end pressure sensor (3) and with motor (1) with converter (4) that pressure sensor (3) are connected, motor (1) pumping device (2) pressure sensor (3) with converter (4) form closed loop control circuit, with can be according to the pressure signal that pressure sensor (3) detected passes through converter (4) control motor (1).
2. The chilled water constant pressure control system according to claim 1, wherein three-phase power input terminals (R, S, T) of the inverter (4) are connected to a line L1, a line L2, and a line L3, respectively, and three-phase output terminals (U, V, W) of the inverter (4) are connected to the motor (1).
3. The chilled water constant pressure control system according to claim 1, wherein the common terminal (COM) of the frequency converter (4) is connected to the analog quantity common terminal (GND).
4. The chilled water constant pressure control system according to claim 1, wherein the analog input (P24, AI2) of the frequency converter (4) is connected with the pressure sensor (3).
5. The chilled water constant pressure control system according to claim 1, wherein the pressure sensor (3) is a pressure transmitter.
6. The chilled water constant pressure control system according to claim 5, wherein the frequency converter (4) controls the rotation speed or rotation frequency of the motor (1) by a PID control mechanism according to the pressure signal of the pressure sensor (3).
7. The chilled water constant pressure control system according to any one of claims 1 to 6, wherein a filter is connected to a signal transmission circuit between the pressure sensor (3) and the frequency converter (4).
8. The chilled water constant pressure control system according to any one of claims 1 to 6, wherein the pressure sensor (3) is connected to an outlet pipe of the pumping device (2) via a detection pipe.
9. The chilled water constant pressure control system of claim 2, wherein the line L1, the line L2 and the line L3 are provided with a switch.
10. A water supply system comprising the chilled water constant pressure control system according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121932363.0U CN216080566U (en) | 2021-08-16 | 2021-08-16 | Chilled water constant pressure control system and water supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121932363.0U CN216080566U (en) | 2021-08-16 | 2021-08-16 | Chilled water constant pressure control system and water supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216080566U true CN216080566U (en) | 2022-03-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121932363.0U Active CN216080566U (en) | 2021-08-16 | 2021-08-16 | Chilled water constant pressure control system and water supply system |
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|---|---|
| CN (1) | CN216080566U (en) |
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2021
- 2021-08-16 CN CN202121932363.0U patent/CN216080566U/en active Active
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