A constant flow two-stage cooling circulating water controller

Abstract

The utility model discloses a fixed flow two-stage cooling circulating water controller relates to industrial cooling circulating water control technical field. The utility model discloses through control button start -up system, and according to " circulating water pump cooling tower fan process equipment " order start -up, and interlock control cooling tower inlet valve. According to the automatic switching operation mode of plate exchange outlet water temperature: it is completely natural cooling mode when 30 DEG C, it is partial natural cooling mode when 30 DEG C. The utility model discloses through receiving system everywhere temperature, pressure and equipment state signal, according to the preset logic automatic control circulating water pump, cooling tower, refrigerated water system etc. the start -stop sequence and operation mode of equipment, and have the communication function and can feedback information to integrated management platform. Its solved the inconvenient manual control of existing system, high energy consumption, equipment control complex etc. problem, realized the system automation operation, promoted the building equipment intelligent management level.

Description

Technical Field

[0001] This utility model belongs to the field of industrial cooling circulating water control technology, and in particular relates to a constant flow two-stage cooling circulating water controller. Background Technology

[0002] Industrial cooling water circulation systems typically consist of cooling towers, circulating pumps, and control buttons. When the outlet water temperature of the cooled equipment is required to be below 32℃, a chilled water circulation system (including chillers and chilled pumps) is also required. In scenarios where a Building Automation (BA) system is not installed, cooling water circulation systems are often manually controlled or have controllers with only simple start-stop functions. This results in inconvenience in use, high energy consumption, poor economic efficiency, and a lack of automatic mode switching and optimized sequence control logic based on water temperature (such as the outlet water temperature of plate heat exchangers). Furthermore, the numerous controlled devices and complex control logic in a cooling water + chilled water staged cooling system further complicate management and reduce the level of intelligence.

[0003] Therefore, this utility model proposes an automatic controller for the two-stage cooling system, which collects system parameters and automatically executes control commands to overcome the shortcomings of the prior art. Utility Model Content

[0004] The purpose of this utility model is to provide a constant flow two-stage cooling circulating water controller. The "two-stage cooling" here refers to: the first stage uses a cooling tower for natural cooling or partial natural cooling, and the second stage uses chilled water provided by a refrigeration unit and a plate heat exchanger for mechanical refrigeration.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model is a constant flow two-stage cooling water controller, including a control module, an input module, an output module and a communication module;

[0007] The input module is used to collect signals, including the status and fault signals of the circulating water pump, the status signal of the chiller, the status signal of the cooling tower, the inlet water temperature of the cooling tower, the inlet water pressure of the cooling tower, the outlet water temperature of the plate heat exchanger, and the outlet water pressure of the plate heat exchanger.

[0008] The output module is used to output control signals, including cooling tower fan start / stop signals, circulating water pump start / stop signals, chilled water system start / stop signals, and cooling tower inlet valve switch signals;

[0009] The control module is used to receive signals from the input module and control the output module to act according to preset logic, thereby realizing equipment start-up and shutdown sequence control, operation mode switching and fault response.

[0010] The communication module is used to feed back system temperature, pressure, and equipment operating status to the integrated management platform.

[0011] In one embodiment, the preset equipment start-up sequence of the control module is: first start the circulating water pump, then start the cooling tower fan, and finally start the process equipment; the shutdown sequence is the reverse; and the start and stop of the cooling tower fan is interlocked with the opening and closing of the cooling tower inlet water pipe valve.

[0012] In one embodiment, a multi-location manual control module is also included. This module includes manual start / stop buttons installed in the user rooms and pump rooms. These buttons are directly connected to the controller's input module via signal lines. When an operator presses the manual start / stop button in a room or pump room, the resulting start / stop command signal is collected by the input module and transmitted to the control module. The control module then executes the corresponding system start / stop control logic, thereby enabling manual control of the system's start / stop from multiple locations.

[0013] In one embodiment, the control module presets relevant temperature parameter thresholds. For example, the inlet water temperature of the process equipment can be set to approximately 28–32°C, and the outlet water temperature to approximately 28–40°C; the chilled water supply and return water temperatures can be set to approximately 18°C / 28°C; and the cooling water supply and return water temperatures can be set to approximately 32°C / 40°C. These parameters can be adjusted according to the actual application scenario. Specifically, the core threshold for the plate heat exchanger outlet water temperature used for automatic switching of operating modes is set as follows: the threshold for entering a fully natural cooling mode is ≤30°C, the threshold for entering a partial natural cooling mode is >30°C, and the threshold for stopping the chilled water system in the partial natural cooling mode is <28°C.

[0014] In one embodiment, the control module presets two operating modes:

[0015] Completely natural cooling mode: When the outlet water temperature of the plate heat exchanger is ≤30℃, the chiller unit and plate heat exchanger will not work;

[0016] Partial natural cooling mode: When the plate heat exchanger outlet water temperature is >30℃, the chiller unit and plate heat exchanger operate; when the plate heat exchanger outlet water temperature is below 28℃, the chilled water system stops.

[0017] In one embodiment, a pressure monitoring and water replenishment control module is also included, which controls the constant pressure water replenishment device to start water replenishment when the system pressure is insufficient.

[0018] In one embodiment, a maintenance module is also included, which stops the controller and releases remote control when the maintenance button is pressed.

[0019] This utility model has the following beneficial effects:

[0020] This invention realizes the automated control of the cooling water circulation system, automatically controlling the start-up and shutdown sequence of the equipment according to a preset program, reducing manual operation and improving ease of use.

[0021] This invention reduces system energy consumption and improves operational economy by automatically switching between two cooling modes (complete natural cooling / partial natural cooling).

[0022] This invention features multi-location manual control and maintenance protection functions, enhancing the flexibility and safety of system operation.

[0023] The communication function of this invention enables centralized feedback of system status, thereby improving the intelligent operation and scientific management level of building equipment.

[0024] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A front view of a constant flow two-stage cooling water circulation controller;

[0027] Figure 2 This is a schematic diagram of the working principle of a two-stage cooling circulating water controller with a constant flow rate.

[0028] The attached diagram lists the components represented by each number as follows:

[0029] 1. Cooling pump start / stop and status signals; 2. Cooling tower start / stop and status signals; 3. Cooling tower inlet water temperature and pressure; 4. Plate heat exchanger outlet water temperature and pressure; 5. Chilled water system start / stop and status; 6. Remote control button; 7. Power switch; 8. System start button; 9. Local maintenance button; 10. AC 220V power input interface; 11. Power indicator light; 12. Communication interface; 13. System status indicator light. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Example 1

[0032] Please see Figures 1-2 As shown, this utility model is a constant flow two-stage cooling water controller, including a control module, an input module, an output module and a communication module;

[0033] The input module is used to collect signals, including the status and fault signals of the circulating water pump, the status signals of the chiller, the status signals of the cooling tower, the inlet water temperature of the cooling tower, the inlet water pressure of the cooling tower, the outlet water temperature of the plate heat exchanger, and the outlet water pressure of the plate heat exchanger.

[0034] The output module is used to output control signals, including cooling tower fan start / stop signals, circulating water pump start / stop signals, chilled water system start / stop signals, and cooling tower inlet valve switch signals;

[0035] The control module receives signals from the input module and controls the output module to perform actions according to preset logic, thereby enabling equipment start-up and shutdown sequence control, operation mode switching, and fault response.

[0036] The communication module is used to feed back system temperature, pressure and equipment operating status to the integrated management platform.

[0037] Furthermore, the control module presets the equipment start-up sequence as follows: first start the circulating water pump, then start the cooling tower fan, and finally start the process equipment; the shutdown sequence is the reverse; and the start and stop of the cooling tower fan is interlocked with the opening and closing of the cooling tower inlet water pipe valve.

[0038] Furthermore, it also includes multiple manual control modules, which have manual start / stop buttons in the use room and pump room, allowing manual control of the system's start and stop.

[0039] Furthermore, the preset water temperature parameters of the control module are: process equipment inlet water temperature 28-32℃, outlet water temperature 28-40℃; chilled water supply and return water temperature 18℃ / 28℃; cooling water supply and return water temperature 32℃ / 40℃.

[0040] Furthermore, the control module has two preset operating modes:

[0041] Completely natural cooling mode: When the outlet water temperature of the plate heat exchanger is ≤30℃, the chiller unit and plate heat exchanger will not work;

[0042] Partial natural cooling mode: When the plate heat exchanger outlet water temperature is >30℃, the chiller unit and plate heat exchanger operate; when the plate heat exchanger outlet water temperature is below 28℃, the chilled water system stops.

[0043] Furthermore, it also includes a pressure monitoring and water replenishment control module, which controls the constant pressure water replenishment device to start water replenishment when the system pressure is insufficient.

[0044] Furthermore, it also includes a maintenance module; when the maintenance button is pressed, the controller stops operating and remote control is deactivated.

[0045] Example 2

[0046] This utility model provides a constant flow two-stage cooling water circulating controller, the specific technical solution of which is as follows:

[0047] 1. Equipment start / stop control logic

[0048] The system is controlled by a start button, and the start-up sequence is: first start the circulating water pump → then start the cooling tower fan → finally start the process equipment; the shutdown sequence is the reverse. The start and stop of the cooling tower fan are interlocked with the opening and closing of the cooling tower inlet water pipe valve; when the system pressure is insufficient, the constant pressure water supply device is automatically activated to replenish water.

[0049] 2. Manual control replenishment

[0050] Manual start / stop buttons are installed in the rooms and pump rooms, allowing for manual intervention of the system operation from multiple locations.

[0051] 3. Water temperature parameter setting

[0052] Process equipment: Inlet water temperature 28~32℃, outlet water temperature 28~40℃;

[0053] Chilled water: Supply and return water temperatures 18℃ / 28℃;

[0054] Cooling water: supply and return water temperatures 32℃ / 40℃.

[0055] 4. Switching between operating modes

[0056] The system operates in two modes, automatically switching based on the outlet water temperature of the plate heat exchanger:

[0057] Completely natural cooling mode: When the outlet water temperature of the plate heat exchanger is ≤30℃, the chiller unit and plate heat exchanger will not work;

[0058] Partial natural cooling mode: When the outlet water temperature of the plate heat exchanger is >30℃, the chiller unit and plate heat exchanger work; when the outlet water temperature is below 28℃, the chilled water system stops.

[0059] 5. Signal Interaction

[0060] Input signals: circulating water pump status and fault signals, chiller status signals, cooling tower status signals, cooling tower inlet water temperature / pressure, plate heat exchanger outlet water temperature / pressure;

[0061] Output signals: Cooling tower fan start / stop signal, circulating water pump start / stop signal, chilled water system start / stop signal, cooling tower inlet valve switch signal.

[0062] 6. Maintenance function

[0063] When the maintenance button is pressed, the controller stops operating and all remote control functions are disabled, facilitating equipment maintenance.

[0064] 7. Communication Function

[0065] The system temperature, pressure, and equipment operating status are fed back to the integrated management platform in real time through the communication module, enabling centralized monitoring.

[0066] Example 3

[0067] like Figure 2 As shown in the figure, the operation process of a constant flow two-stage cooling water controller in this embodiment is as follows:

[0068] 1. System startup

[0069] When the operator presses the start button, the controller starts the system according to the preset logic: first, the circulating water pump is started, and after the water pump runs stably (the status signal feedback is normal), the cooling tower fan is turned on (and the cooling tower inlet water pipe valve is opened at the same time), and finally the process equipment is started; the system pressure sensor monitors the pressure in real time, and when the pressure is lower than the set value (such as 0.2MPa), the constant pressure water supply device automatically starts to supply water.

[0070] 2. Switching between operating modes

[0071] When the outlet water temperature of the plate heat exchanger is ≤30℃, the system enters a completely natural cooling mode: the chiller and plate heat exchanger stop working, and cooling is achieved only through the cooling water system;

[0072] When the outlet water temperature of the plate heat exchanger is >30℃, the system switches to partial natural cooling mode: the controller outputs a signal to start the chiller unit and plate heat exchanger, and the chilled water system is put into operation; when the outlet water temperature drops below 28℃, the controller sends a stop signal and the chilled water system is shut down.

[0073] 3. Manual control and maintenance

[0074] If manual intervention is required, operators can start and stop the system manually via a button in the workshop or pump room. When performing equipment maintenance, pressing the maintenance button will stop all control outputs from the controller and deactivate remote control permissions, ensuring maintenance safety.

[0075] 4. Status Feedback

[0076] The controller transmits parameters such as cooling tower inlet water temperature (32℃ / 40℃), chilled water supply and return water temperature (18℃ / 28℃), circulating water pump operating status, and chiller fault signals to the workshop integrated management platform in real time via a communication module (such as an RS485 interface) to achieve remote monitoring.

[0077] This embodiment achieves automated and intelligent operation of the cooling water circulation system through the above control logic, solving many problems of traditional manual control.

[0078] Combination Figure 2 The diagram shown illustrates the working principle of the two-stage cooling system of this invention:

[0079] The start / stop and status signals 1 for the cooling pump and 2 for the cooling tower are fed back to the input module of the controller from the field equipment.

[0080] The input module receives the sensor signals for cooling tower inlet water temperature and pressure 3 and plate heat exchanger outlet water temperature and pressure 4.

[0081] The start / stop and status 5 signals of the chilled water system are bidirectional. The status is fed back to the input module, and the start / stop command is issued by the output module.

[0082] Remote control button 6, power switch 7, system start button 8, and local maintenance button 9 are local human-machine interfaces connected to the controller.

[0083] The AC 220V power input interface 10 provides power, and the power indicator light 11 displays the power supply status.

[0084] Communication interface 12 is used to connect to the integrated management platform.

[0085] System status indicator 13 displays the current operating mode, fault status, etc.

[0086] The controller collects signals from the cooling pump start / stop and status signal 1, the cooling tower start / stop and status signal 2, the cooling tower inlet water temperature and pressure 3, the plate heat exchanger outlet water temperature and pressure 4, and the chilled water system start / stop and status signal 5. It processes these signals according to preset logic (such as start-up sequence and mode switching conditions), and controls the equipment to start / stop the cooling tower, chilled water system, and valves through the output module. It also uploads the status information through the communication interface, and the local status is indicated by the system status indicator light 13.

[0087] In the description of this specification, references to terms such as "an embodiment," "example," and "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0088] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A constant flow rate two-stage cooling water circulation controller, characterized in that, include: Input module: Collects status and fault signals of circulating water pump, status signals of chiller, status signals of cooling tower, inlet water temperature and pressure of cooling tower, and outlet water temperature and pressure of plate heat exchanger; Output module: Outputs cooling tower fan start / stop signals, circulating water pump start / stop signals, chilled water system start / stop signals, and cooling tower inlet valve on / off signals; Control module: Receives signals from input modules, controls output modules according to preset logic, and performs equipment start-up and shutdown sequence control, operation mode switching, and fault response. Communication module: Feeds back system parameters and device status to the integrated management platform; The control module presets the equipment start-up sequence as follows: circulating water pump → cooling tower fan → process equipment, and the shutdown sequence is the reverse. The start-up and shutdown of the cooling tower fan are interlocked with the opening and closing of the inlet valve. The control module has two preset operating modes: Complete natural cooling mode: When the plate heat exchanger outlet water temperature is ≤30℃, the control output module outputs a signal to disable the chiller unit and plate heat exchanger; Partial natural cooling mode: When the plate heat exchanger outlet water temperature is >30℃, the control output module outputs a signal to activate the chiller unit and plate heat exchanger; when the plate heat exchanger outlet water temperature is below 28℃, the control output module outputs a signal to stop the chilled water system.

2. The constant flow two-stage cooling water controller according to claim 1, characterized in that, It also includes a multi-location manual control module, wherein the manual control module is equipped with manual start / stop buttons in the use room and pump room, and the manual start / stop buttons are connected to the input module of the controller to send manual start / stop command signals to the control module.

3. A constant flow two-stage cooling water controller according to claim 1, characterized in that, The preset water temperature parameter thresholds of the control module include the plate heat exchanger outlet water temperature threshold for switching operating modes, wherein the switching threshold between fully natural cooling mode and partially natural cooling mode is 30°C, and the temperature threshold for stopping the chilled water system in partially natural cooling mode is 28°C.

4. A constant flow two-stage cooling water controller according to claim 1, characterized in that, It also includes a pressure monitoring and water replenishment control module, which activates a constant pressure water replenishment device when the system pressure is insufficient.

5. A constant flow two-stage cooling water controller according to claim 1, characterized in that, It also includes a maintenance module; when the maintenance button is pressed, the controller stops operating and remote control is disabled.

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