Temperature control device of cooling tower

Abstract

The utility model relates to the technical field of temperature control, and discloses a temperature control device of a cooling tower, which comprises a flow sensor, a flow control valve and a water inlet temperature sensor which are arranged at a water inlet of a water inlet branch pipe of each cooling tower; the flow sensor is used for detecting flow data of each cooling tower; the water inlet temperature sensor is used for detecting the water inlet temperature of each cooling tower; the outlet water temperature sensor is arranged at a water outlet of a water outlet branch pipe of each cooling tower and is used for detecting the outlet water temperature of each cooling tower; and the control module is used for controlling the flow control valve of each cooling tower according to the flow data at the water inlet of the water inlet branch pipe of each cooling tower and controlling the fan arranged in each cooling tower according to the water inlet temperature and the water outlet temperature of each cooling tower. Under the working condition that part of the cooling towers are started, water flow balance of the cooling towers connected in parallel is guaranteed, and linkage adjustment of the rotating speed and the number of the fans and the temperature difference between inlet water and outlet water is achieved.

Description

Technical Field

[0001] This utility model relates to the field of temperature control technology, specifically to a temperature control device for cooling towers. Background Technology

[0002] Water-cooled centralized air conditioning systems typically require multiple cooling towers connected in parallel, sharing inlet and outlet water mains. Each cooling tower has an electric valve on its inlet branch pipe that is linked to the corresponding cooling water pump, a manual maintenance valve on its outlet branch pipe, and a balancing pipe between the water collection basins of multiple cooling towers.

[0003] When only some cooling towers are operational, the water level in the water pans of the operational cooling towers often rises, causing overflow, while the water level in the water pans of the other, offline cooling towers drops, requiring continuous water replenishment. In response, maintenance personnel typically only open the electric valves on the inlet branch pipes of the offline cooling towers. Since the fans are not running, this untreated high-temperature water mixes with the treated low-temperature cooling water from the operational cooling towers and returns to the refrigeration unit, causing the refrigeration unit's cooling water inlet temperature to rise and reducing cooling efficiency. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the problem in the related technology that when only part of the cooling tower is turned on, the water level in the water pan of the cooling tower in the turned-on state rises, causing overflow, and when the cooling tower in the turned-off state, the water level in the water pan of the cooling tower drops, and the continuous replenishment of water causes high-temperature water that has not been effectively cooled to return to the refrigeration unit, which in turn leads to an increase in the inlet water temperature of the refrigeration unit and a decrease in refrigeration efficiency.

[0005] To solve the above-mentioned technical problems, this utility model provides a temperature control device for cooling towers, applicable to situations where some cooling towers are operating in a multi-unit cooling tower configuration. The temperature control device for the cooling tower includes:

[0006] Flow sensor, flow control valve, inlet water temperature sensor, outlet water temperature sensor, and control module;

[0007] The flow sensor, the flow control valve, and the inlet water temperature sensor are all installed at the inlet of the inlet branch pipe of each of the multiple cooling towers; the flow sensor is used to detect the flow rate data at the inlet of the inlet branch pipe of each cooling tower; the inlet water temperature sensor is used to detect the inlet water temperature at the inlet of the inlet branch pipe of each cooling tower.

[0008] The outlet water temperature sensors are all installed at the outlet of the outlet branch pipe of each of the multiple cooling towers; the outlet water temperature sensors are used to detect the outlet water temperature at the outlet of the outlet branch pipe of each cooling tower.

[0009] The control modules are all connected to the flow sensor, the flow control valve, the inlet water temperature sensor, and the outlet water temperature sensor. The control modules are used to control the flow control valve installed at the inlet of the inlet branch pipe of each cooling tower according to the flow data at the inlet of the inlet branch pipe of each cooling tower, and to control the fan installed in each cooling tower according to the inlet water temperature at the inlet of the inlet branch pipe of each cooling tower and the outlet water temperature at the outlet of the outlet branch pipe of each cooling tower.

[0010] In one optional implementation, the control module includes a data acquisition unit, a computing unit, and a control unit;

[0011] The data acquisition units are all connected to the flow sensor, the inlet water temperature sensor, the outlet water temperature sensor, and also to the control unit;

[0012] The data acquisition unit is used to acquire the flow rate data at the inlet of the inlet branch pipe of each cooling tower, the inlet water temperature at the inlet of the inlet branch pipe of each cooling tower, and the outlet water temperature at the outlet of the outlet branch pipe of each cooling tower, and send the flow rate data at the inlet of the inlet of the inlet branch pipe of each cooling tower, the inlet water temperature at the inlet of the inlet branch pipe of each cooling tower, and the outlet water temperature at the outlet of the outlet branch pipe of each cooling tower to the control unit.

[0013] The computing units are all connected to the data acquisition unit and the control unit;

[0014] The calculation unit is used to determine the average flow rate based on the flow rate data at the inlet of the inlet branch pipe of each cooling tower, and to determine the temperature difference between the inlet and outlet of each cooling tower based on the inlet water temperature at the inlet of the inlet branch pipe of each cooling tower and the outlet water temperature at the outlet of the outlet branch pipe of each cooling tower; and to send the average flow rate and the temperature difference between the inlet and outlet of each cooling tower to the control unit.

[0015] The control unit is connected to the flow control valve installed at the inlet of the water inlet branch pipe of each cooling tower;

[0016] The control unit is used to control the flow control valve installed at the inlet of the water inlet branch pipe of each cooling tower according to the average flow rate, and to control the fan installed in the corresponding cooling tower according to the temperature difference between the inlet and outlet of each cooling tower.

[0017] In one optional embodiment, the control unit includes a flow control unit and a temperature control unit; the flow control unit is connected to a flow control valve installed at the inlet of the water inlet branch pipe of each cooling tower, and the temperature control unit is connected to a fan installed in each cooling tower.

[0018] The flow control unit is used to control the opening degree of the flow control valve installed at the inlet of the water inlet branch pipe of each cooling tower according to the average flow rate.

[0019] The temperature control unit is used to control the speed of the fan installed in the corresponding cooling tower or to control the number of fans turned on in the corresponding cooling tower based on the temperature difference between the inlet and outlet of each cooling tower.

[0020] In one optional implementation, the control unit is specifically used to reduce the speed of the fan installed in the corresponding cooling tower or reduce the number of fans turned on in the corresponding cooling tower when the temperature difference between the inlet and outlet of the cooling tower is within a first preset range.

[0021] When the temperature difference between the inlet and outlet of the cooling tower is within the second preset range, the fan installed in the corresponding cooling tower is controlled to run at a preset constant speed, or the number of fans in the corresponding cooling tower is controlled to be turned on to a preset number.

[0022] When the temperature difference between the inlet and outlet of the cooling tower is within the third preset range, increase the speed of the fan installed in the corresponding cooling tower or increase the number of fans turned on in the corresponding cooling tower.

[0023] Wherein, the minimum value in the second preset range is greater than the maximum value in the first preset range, and the maximum value in the second preset range is less than the minimum value in the third preset range.

[0024] In one optional embodiment, the temperature control device of the cooling tower further includes: a main unit inlet water temperature sensor;

[0025] The main unit inlet water temperature sensor is installed at the water inlet of the cooling main unit;

[0026] The host water inlet temperature sensor is used to obtain the host water inlet temperature at the host water inlet.

[0027] In one optional implementation, the main unit inlet water temperature sensor is connected to the temperature control unit;

[0028] The temperature control unit is also used to control the water inlet temperature of the cooling unit to be within the target temperature range.

[0029] The technical solution provided by this utility model has the following technical effects:

[0030] This embodiment of the invention installs a flow sensor, a flow control valve, and an inlet water temperature sensor at the inlet of the water inlet branch pipe of each of the multiple cooling towers. This enables real-time acquisition of flow data, inlet water temperature, and outlet water temperature, as well as precise flow control. The flow control valve at the inlet of each cooling tower's water inlet branch pipe is controlled based on the flow data, and the fan in each cooling tower is controlled based on the inlet and outlet water temperatures. This achieves precise control of the cooling towers, effectively reducing overflow and water shortage, achieving water flow balance, and improving cooling efficiency. By installing the flow sensor, inlet water temperature sensor, and outlet water temperature sensor, the inlet water flow, inlet water temperature, and outlet water temperature of the cooling tower can be monitored in real time, providing accurate data support for the control module and ensuring the accuracy and timeliness of control. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a structural schematic diagram of the temperature control device for a cooling tower according to an embodiment of the present utility model;

[0033] The reference numerals in the attached figures are, in order: 11, flow sensor; 12, flow control valve; 13, inlet water temperature sensor; 14, outlet water temperature sensor; 15, control module. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0037] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0038] Figure 1 This is a structural schematic diagram of the temperature control device for a cooling tower according to an embodiment of the present utility model.

[0039] like Figure 1 As shown in the embodiment of this utility model, a temperature control device for a cooling tower is provided, which is applied to the condition where some cooling towers are turned on among multiple cooling towers. The temperature control device for the cooling tower includes:

[0040] Flow sensor 11, flow control valve 12, inlet water temperature sensor 13, outlet water temperature sensor 14, and control module 15.

[0041] The flow sensor 11, flow control valve 12, and inlet water temperature sensor 13 are all installed at the inlet of the inlet branch pipe of each of the multiple cooling towers. The flow sensor 11 is used to detect the flow rate data at the inlet of the inlet branch pipe of each cooling tower. The inlet water temperature sensor 13 is used to detect the inlet water temperature at the inlet of the inlet branch pipe of each cooling tower.

[0042] The outlet water temperature sensor 14 is installed at the outlet of the outlet branch pipe of each of the multiple cooling towers. The outlet water temperature sensor 14 is used to detect the outlet water temperature at the outlet of the outlet branch pipe of each cooling tower.

[0043] The control module 15 is connected to the flow sensor 11, the flow control valve 12, the inlet water temperature sensor 13, and the outlet water temperature sensor 14. The control module 15 is used to control the flow control valve 12 installed at the inlet of the inlet branch pipe of each cooling tower according to the flow data at the inlet of the inlet branch pipe of each cooling tower, and to control the fan installed in each cooling tower according to the inlet water temperature at the inlet of the inlet branch pipe of each cooling tower and the outlet water temperature at the outlet of the outlet branch pipe of each cooling tower.

[0044] In this embodiment, the flow sensor 11, the inlet water temperature sensor 13, and the outlet water temperature sensor 14 can be collectively referred to as the energy valve.

[0045] As an example, the temperature control device for this cooling tower can be applied to a water-cooled centralized air conditioning system. This system typically includes multiple cooling towers, and the device can be used when some towers are operational while the rest are shut down. In other words, the device can be applied to water-cooled centralized air conditioning systems where both cooling towers are simultaneously in a shut-down and operational state. Specifically, in this system, multiple cooling towers are connected in parallel, sharing inlet and outlet mains. Each cooling tower's inlet branch pipe is equipped with an electric valve linked to the corresponding cooling water pump, and each cooling tower's outlet branch pipe is equipped with a manual maintenance valve. A balancing pipe is installed between the water collection trays of the multiple cooling towers.

[0046] When some cooling towers are in operation, the water level in the cooling tower water pan is usually not assessed. This can easily lead to overflow when the water level in the water pan of the operating cooling tower rises, while water needs to be added continuously when the water level in the water pan of the other cooling towers that are shut down drops.

[0047] This embodiment of the invention, by setting a flow sensor 11, an inlet water temperature sensor 13, and an outlet water temperature sensor 14, can monitor the inlet water flow, inlet water temperature, and outlet water temperature of the cooling tower in real time, providing accurate data support for the control module 15 and ensuring the accuracy and timeliness of control. It can control the flow control valve 12 at the inlet of each cooling tower's inlet branch pipe based on the flow data at the inlet of each cooling tower's inlet branch pipe, and control the fan in each cooling tower based on the inlet water temperature at the inlet of each cooling tower's inlet branch pipe and the outlet water temperature at the outlet of each cooling tower's outlet branch pipe, achieving precise control of the cooling tower, effectively reducing overflow and water shortage, achieving water flow balance, and improving cooling effect. It can effectively prevent the problem of high-temperature water that has not been effectively cooled from mixing with low-temperature cooling water treated by the cooling tower when it is open and returning to the refrigeration unit, causing the refrigeration unit's cooling water inlet temperature to rise and reducing cooling efficiency.

[0048] In one alternative implementation, the control module 15 includes a data acquisition unit, a computing unit, and a control unit.

[0049] The data acquisition units are all connected to the flow sensor 11, the inlet water temperature sensor 13, the outlet water temperature sensor 14, and also to the control unit.

[0050] The data acquisition unit is used to acquire the flow rate data at the inlet of the inlet branch pipe of each cooling tower, the inlet water temperature at the inlet of the inlet branch pipe of each cooling tower, and the outlet water temperature at the outlet of the outlet branch pipe of each cooling tower, and send the flow rate data at the inlet of the inlet of the inlet branch pipe of each cooling tower, the inlet water temperature at the inlet of the inlet branch pipe of each cooling tower, and the outlet water temperature at the outlet of the outlet branch pipe of each cooling tower to the control unit.

[0051] The computing units are all connected to the data acquisition unit and the control unit.

[0052] The calculation unit determines the average flow rate based on the flow rate data at the inlet of each cooling tower's inlet branch pipe, and determines the temperature difference between the inlet and outlet of each cooling tower based on the inlet water temperature at the inlet of each cooling tower's inlet branch pipe and the outlet water temperature at the outlet of each cooling tower's outlet branch pipe. It then sends the average flow rate and the temperature difference between the inlet and outlet of each cooling tower to the control unit.

[0053] The control unit is connected to the flow control valve 12 installed at the inlet of the water inlet branch pipe of each cooling tower.

[0054] The control unit is used to control the flow control valve 12 installed at the inlet of the water inlet branch pipe of each cooling tower according to the average flow rate, and to control the fan installed in the corresponding cooling tower according to the temperature difference between the inlet and outlet of each cooling tower.

[0055] In this embodiment, the control module 15 includes a data acquisition unit, a calculation unit, and a control unit, which realizes the functions of data acquisition, calculation, and control, and improves the level of intelligence of control.

[0056] In one optional implementation, the control unit includes a flow control unit and a temperature control unit. The flow control unit is connected to a flow control valve 12 installed at the inlet of the water inlet branch pipe of each cooling tower, and the temperature control unit is connected to a fan installed in each cooling tower.

[0057] The flow control unit is used to control the opening of the flow control valve 12 installed at the inlet of the water inlet branch pipe of each cooling tower according to the average flow rate. Specifically, the opening of the flow control valve 12 installed at the inlet of the water inlet branch pipe of the cooling tower can be adjusted according to the average flow rate as the target value until the flow rate data at the inlet of the water inlet branch pipe of the cooling tower reaches the average flow rate (target value).

[0058] The temperature control unit is used to control the speed of the fans installed in the corresponding cooling tower or to control the number of fans turned on in the corresponding cooling tower based on the temperature difference between the inlet and outlet of each cooling tower.

[0059] In this embodiment, the control unit includes a flow control unit and a temperature control unit, which respectively control the flow rate and temperature, thereby improving the accuracy and efficiency of the control.

[0060] In this embodiment, the flow control unit is specifically used to control the opening degree of the flow control valve 12 installed at the inlet of the inlet branch pipe of each cooling tower based on the average flow rate and the flow rate data at the inlet of the inlet branch pipe of each cooling tower. The opening degree of the flow control valve 12 installed at the inlet of the inlet branch pipe of each cooling tower can be controlled based on the flow difference between the average flow rate and the flow rate data at the inlet of the inlet of the inlet branch pipe of each cooling tower. A proportional relationship (adjustment standard) between the flow difference and the opening degree of the flow control valve 12 can be preset, for example, a direct proportional relationship. The opening degree of the flow control valve 12 is adjusted according to the proportional-integral method; when the flow difference is large, the opening degree of the flow control valve 12 is larger, and when the flow difference is small, the opening degree of the flow control valve 12 is smaller.

[0061] Based on the above technical solution, the calculation unit is also used to calculate the flow difference for each cooling tower based on the average flow rate and the flow data at the inlet of the inlet branch pipe of each cooling tower. It also calculates the target opening of the flow control valve 12 at the inlet of the inlet branch pipe of each cooling tower based on a pre-set proportional relationship, the flow difference, and the current opening of the flow control valve 12 at the inlet of the inlet branch pipe. The flow control unit is used to adjust the opening of the flow control valve 12 at the inlet of the inlet branch pipe of the cooling tower from the current opening to the target opening. The target opening is determined based on a pre-set proportional relationship, the flow difference, and the current opening of the flow control valve 12 at the inlet of the inlet branch pipe of the cooling tower.

[0062] In this embodiment, the temperature control unit is specifically used to control the speed of the fan installed in the corresponding cooling tower or to control the number of fans turned on in the corresponding cooling tower based on the water temperature at the outlet of the outlet branch pipe of each cooling tower, the water temperature at the inlet of the inlet branch pipe of each cooling tower, and the temperature difference between the inlet and outlet of each cooling tower.

[0063] In this embodiment, the correspondence between temperature difference, fan speed, and the number of fans turned on (inlet water temperature and outlet water temperature) can be preset, and the specific relationship can be determined through simulation experiments. When the temperature difference is large, the fan speed is increased or the number of fans turned on is increased; when the temperature difference is small, the fan speed is decreased or the number of fans turned on is decreased.

[0064] In this embodiment, each cooling tower is equipped with at least one fan.

[0065] In one alternative implementation, the control unit is specifically configured to reduce the rotational speed of the fan installed in the corresponding cooling tower or reduce the number of fans turned on in the corresponding cooling tower when the temperature difference between the inlet and outlet of the cooling tower is within a first preset range.

[0066] When the temperature difference between the inlet and outlet of the cooling tower is within the second preset range, the fan installed in the corresponding cooling tower is controlled to run at a preset constant speed, or the number of fans in the corresponding cooling tower turned on is controlled to a preset number.

[0067] When the temperature difference between the inlet and outlet of the cooling tower is within the third preset range, increase the speed of the fan installed in the corresponding cooling tower or increase the number of fans turned on in the corresponding cooling tower.

[0068] Among them, the minimum value in the second preset range is greater than the maximum value in the first preset range, and the maximum value in the second preset range is less than the minimum value in the third preset range.

[0069] In this embodiment, when the temperature difference between the inlet and outlet of the cooling tower is large, it is necessary to increase the fan speed and the number of fans turned on. When the temperature difference between the inlet and outlet of the cooling tower is small, it is necessary to reduce the fan speed and the number of fans turned on.

[0070] In this embodiment, the preset constant rotation speed, preset quantity, first preset range, second preset range, and third preset range can be set and modified according to actual conditions, and can be a temperature range or a specific temperature value.

[0071] In this embodiment, the fan speed and the number of fans turned on can be adjusted simultaneously, or the fan speed or the number of fans turned on can be adjusted separately.

[0072] As an example, the first preset range can be [3℃, 5℃], the second preset range can be 5℃, and the third preset range can be (5℃, 10℃) or greater than 5℃. For example, when the temperature difference between the inlet and outlet is detected to be 5℃, the cooling tower fan maintains a preset constant speed. When the temperature difference between the inlet and outlet is detected to be within the range of 3 to 5℃, the cooling tower fan speed is reduced or the number of cooling tower fans turned on is reduced. When the temperature difference between the inlet and outlet is detected to exceed 5℃, the fan speed in the cooling tower is increased or the number of fans turned on in the cooling tower is increased. In this embodiment, adjusting the speed or the number of fans turned on by the temperature difference between the inlet and outlet can effectively prevent the high-temperature water that has not been effectively cooled from mixing with the low-temperature cooling water and returning to the refrigeration unit, causing the refrigeration unit's cooling water inlet temperature to rise.

[0073] In one alternative implementation, the cooling tower's temperature control device further includes a main unit inlet water temperature sensor.

[0074] The main unit inlet water temperature sensor is located at the water inlet of the cooling main unit.

[0075] The main unit inlet water temperature sensor is used to obtain the main unit inlet water temperature at the main unit's inlet.

[0076] In one alternative implementation, the main unit inlet water temperature sensor is connected to the temperature control unit.

[0077] The temperature control unit is also used to control the water inlet temperature of the cooling unit to be within the target temperature range.

[0078] In this embodiment, the temperature control unit is also used to control the water inlet temperature of the cooling unit at the inlet to be within the target temperature range, thereby achieving coordinated control of the cooling unit and the cooling tower and further improving the cooling effect.

[0079] In this embodiment, while the temperature control unit adjusts the fan speed or the number of fans turned on, the main unit inlet water temperature sensor also needs to collect the main unit inlet water temperature at the main unit's inlet in real time to ensure that the main unit inlet water temperature at the main unit's inlet is within the target temperature range. The target temperature range can be set and modified according to actual needs.

[0080] In this embodiment, the correspondence between the fan speed, the number of fans turned on, and the inlet water temperature of the cooling unit can be determined in advance through simulation experiments. When the inlet water temperature of the cooling unit is within the target temperature range, the temperature control unit prioritizes controlling the fan speed or the number of fans turned on in the corresponding cooling tower based on the temperature difference between the inlet and outlet of each cooling tower. During the process of controlling the fan speed or the number of fans turned on in the corresponding cooling tower, or after adjustment, if the inlet water temperature of the cooling unit is detected to be outside the target temperature range during the operation of the fans in the corresponding cooling tower, the temperature control unit is also used to fine-tune the fan speed or the number of fans turned on in the cooling tower based on the current inlet water temperature of the cooling unit until the inlet water temperature of the cooling unit is within the target temperature range.

[0081] In this embodiment, the temperature control unit can not only adjust the fan speed or the number of fans activated based on the temperature difference, but also dynamically adjust the fan speed or the number of fans activated by monitoring the inlet water temperature of the cooling unit during and after adjustment. By monitoring the inlet water temperature of the cooling unit in real time and making fine adjustments, the operation of the cooling tower can be controlled more precisely, making the inlet water temperature of the cooling unit closer to the target temperature range, thus improving the accuracy of temperature control. When load changes or other factors cause the inlet water temperature of the cooling unit to deviate from the target temperature range, the fine-tuning function can respond promptly and adjust the fan speed or the number of fans activated to maintain the inlet water temperature of the cooling unit within the target temperature range, enhancing the adaptability and stability of the device.

[0082] Under partial load conditions (partial cooling tower operation), the water level in the cooling tower water pan is typically not assessed. This embodiment of the invention detects the water flow rate in the inlet branch pipe of each cooling tower and calculates the real-time average flow rate as the basis for adjustment. The inlet water flow rate of each cooling tower is adjusted according to the adjustment standards to maintain balance. Measurements and calculations can be performed using flow sensors, outlet water temperature sensors, and inlet water temperature sensors. Based on the outdoor ambient temperature conditions, the control module (central control system) calculates and determines the water volume, temperature, and temperature difference entering and leaving the cooling tower water pan, and determines the flow rate and heat dissipation of each cooling water pump. This allows for adjustment of the opening degree of the flow control valve, the speed of the cooling tower fans, or the number of fans activated.

[0083] During the adjustment process, the inlet and outlet water temperatures of each cooling tower are monitored, and the speed or number of cooling tower fans is adjusted based on the temperature difference between the inlet and outlet water.

[0084] This utility model embodiment solves the problem of some cooling towers overflowing and others needing water replenishment when multiple cooling towers are not fully operational, and also solves the problem of excessively high inlet water temperature and low cooling efficiency of the main unit caused by the mixing of high and low temperature cooling water.

[0085] The technical solution of this utility model can ensure the water flow balance of multiple parallel cooling towers under partial load conditions, and realize the linkage adjustment of cooling tower fan speed, number of openings and inlet and outlet water temperature difference.

[0086] This invention allows the installation of an energy valve at the inlet of each cooling tower to monitor flow rate and inlet / outlet water temperature. The energy valve is linked to the corresponding cooling tower. This invention can adjust the opening of the flow control valve based on the average inlet flow rate of the cooling tower. A smaller flow rate results in a larger valve opening, and a larger flow rate results in a smaller valve closing. This can be achieved through proportional-integral adjustment to achieve a balanced flow. The cooling tower fan speed can also be adjusted according to the temperature difference between the inlet and outlet water; a larger temperature difference results in a higher fan speed, and a smaller temperature difference results in a lower fan speed.

[0087] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A temperature control device for a cooling tower, applied in a water-cooled centralized air conditioning system when some cooling towers are in operation, characterized in that, The temperature control device of the cooling tower includes: Flow sensor, flow control valve, inlet water temperature sensor, outlet water temperature sensor, and control module; The flow sensor, the flow control valve, and the inlet water temperature sensor are all installed at the inlet of the inlet branch pipe of each of the multiple cooling towers; the flow sensor is used to detect the flow rate data at the inlet of the inlet branch pipe of each cooling tower; the inlet water temperature sensor is used to detect the inlet water temperature at the inlet of the inlet branch pipe of each cooling tower. The outlet water temperature sensors are all installed at the outlet of the outlet branch pipe of each of the multiple cooling towers; the outlet water temperature sensors are used to detect the outlet water temperature at the outlet of the outlet branch pipe of each cooling tower. The control modules are all connected to the flow sensor, the flow control valve, the inlet water temperature sensor, and the outlet water temperature sensor. Each control module controls the flow control valve at the inlet of the inlet branch pipe of each cooling tower based on the flow data at the inlet of the inlet branch pipe, and controls the fan in each cooling tower based on the inlet water temperature at the inlet of the inlet branch pipe and the outlet water temperature at the outlet of the outlet branch pipe. The control module is a central control system.

2. The apparatus according to claim 1, characterized in that, The control module includes a data acquisition unit, a computing unit, and a control unit; The data acquisition units are all connected to the flow sensor, the inlet water temperature sensor, the outlet water temperature sensor, and also to the control unit; The data acquisition unit is used to acquire the flow rate data at the inlet of the inlet branch pipe of each cooling tower, the inlet water temperature at the inlet of the inlet branch pipe of each cooling tower, and the outlet water temperature at the outlet of the outlet branch pipe of each cooling tower, and send the flow rate data at the inlet of the inlet of the inlet branch pipe of each cooling tower, the inlet water temperature at the inlet of the inlet branch pipe of each cooling tower, and the outlet water temperature at the outlet of the outlet branch pipe of each cooling tower to the control unit. The computing units are all connected to the data acquisition unit and the control unit; The calculation unit is used to determine the average flow rate based on the flow rate data at the inlet of the inlet branch pipe of each cooling tower, and to determine the temperature difference between the inlet and outlet of each cooling tower based on the inlet water temperature at the inlet of the inlet branch pipe of each cooling tower and the outlet water temperature at the outlet of the outlet branch pipe of each cooling tower. The average flow rate and the temperature difference between the inlet and outlet of each cooling tower are sent to the control unit. The control unit is connected to the flow control valve installed at the inlet of the water inlet branch pipe of each cooling tower; The control unit is used to control the flow control valve installed at the inlet of the water inlet branch pipe of each cooling tower according to the average flow rate, and to control the fan installed in the corresponding cooling tower according to the temperature difference between the inlet and outlet of each cooling tower.

3. The apparatus according to claim 2, characterized in that, The control unit includes a flow control unit and a temperature control unit; the flow control unit is connected to a flow control valve installed at the inlet of the water inlet branch pipe of each cooling tower, and the temperature control unit is connected to a fan installed in each cooling tower. The flow control unit is used to control the opening degree of the flow control valve installed at the inlet of the water inlet branch pipe of each cooling tower according to the average flow rate. The temperature control unit is used to control the speed of the fan installed in the corresponding cooling tower or to control the number of fans turned on in the corresponding cooling tower based on the temperature difference between the inlet and outlet of each cooling tower.

4. The apparatus according to claim 2, characterized in that, The control unit is specifically used to reduce the speed of the fan installed in the corresponding cooling tower or reduce the number of fans turned on in the corresponding cooling tower when the temperature difference between the inlet and outlet of the cooling tower is within a first preset range. When the temperature difference between the inlet and outlet of the cooling tower is within the second preset range, the fan installed in the corresponding cooling tower is controlled to run at a preset constant speed, or the number of fans in the corresponding cooling tower is controlled to be turned on to a preset number. When the temperature difference between the inlet and outlet of the cooling tower is within the third preset range, increase the speed of the fan installed in the corresponding cooling tower or increase the number of fans turned on in the corresponding cooling tower. Wherein, the minimum value in the second preset range is greater than the maximum value in the first preset range, and the maximum value in the second preset range is less than the minimum value in the third preset range.

5. The apparatus according to claim 3, characterized in that, The temperature control device of the cooling tower also includes: a main unit inlet water temperature sensor; The main unit inlet water temperature sensor is installed at the water inlet of the cooling main unit; The host water inlet temperature sensor is used to obtain the host water inlet temperature at the host water inlet.

6. The apparatus according to claim 5, characterized in that, The main unit inlet water temperature sensor is connected to the temperature control unit; The temperature control unit is also used to control the water inlet temperature of the cooling unit to be within the target temperature range.

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