Water replenishing device

Abstract

The utility model provides a water replenishing device. The water replenishing device comprises a signal acquisition module, a frequency conversion control cabinet and a water replenishing pump which are connected in sequence, the make-up pump is connected with the cooling tower through a first make-up pipe; the signal acquisition module is used for acquiring cooling water information associated with a cooling tower and sending the cooling water information to the frequency conversion control cabinet; the signal acquisition module comprises a pressure sensor and / or a liquid level switch module; the liquid level switch module comprises a contactor, and a first liquid level switch and a second liquid level switch which are respectively connected with the contactor; the first liquid level switch and the second liquid level switch are arranged in the cooling tower; the pressure sensor is arranged on the first water supplementing pipe; the water replenishing device adopts the signal acquisition module to replace an electric contact pressure gauge in the prior art, so that the frequency conversion control cabinet can automatically adjust the output frequency based on the cooling water information acquired by the pressure sensor and / or the liquid level switch module, thereby adjusting the rotating speed of the water replenishing pump, and avoiding frequent start and stop of the water replenishing pump in the water replenishing process of the cooling tower.

Description

Technical Field

[0001] The utility model relates to the technical field of water replenishment in a cooling tower of a data center refrigeration system, and particularly relates to a water replenishing device. Background Technique

[0002] Generally speaking, a data center needs to use a refrigeration system for cooling throughout the year, and the automatic water replenishing device of the cooling tower is one of the important parts of the refrigeration system. Under normal operating conditions, the cooling tower is supplied with water jointly by the electric contact pressure gauge, the cooling tower water replenishing pump in the underground pump house, and the water tank. During the operation and commissioning process, it is found that: the interlocking control mode of the cooling tower water replenishing pump is through the electric contact pressure gauge installed on the water replenishing pipe, and the control mode is in digital quantity signal, that is, the on-off control is realized through the contact switch. When the pressure in the water replenishing pipe is higher than the set value, the water replenishing pump is closed; when the pressure in the water replenishing pipe is lower than the set value, the water replenishing pump is started. However, the pressure in the water replenishing pipe fluctuates greatly, and the electric contact pressure gauge is sensitive to the pressure fluctuation, resulting in frequent start and stop of the water replenishing pump. If it operates like this for a long time, the water replenishing pump is prone to failure. Content of the Utility Model

[0003] The embodiment of the utility model provides a water replenishing device, which uses a signal acquisition module to replace the electric contact pressure gauge in the prior art, so that the frequency conversion control cabinet can automatically adjust the output frequency based on the cooling water information collected by the pressure sensor and / or the liquid level switch module, thereby adjusting the rotation speed of the water replenishing pump, and avoiding the frequent start and stop of the water replenishing pump during the water replenishment process of the cooling tower.

[0004] In the first aspect, the embodiment of the utility model provides a water replenishing device, which includes: a signal acquisition module, a frequency conversion control cabinet, and a water replenishing pump connected in sequence; wherein, the water replenishing pump is connected to the cooling tower through a first water replenishing pipe;

[0005] The signal acquisition module is used to collect the cooling water information associated with the cooling tower and send the cooling water information to the frequency conversion control cabinet; wherein, the signal acquisition module includes: a pressure sensor and / or a liquid level switch module; the liquid level switch module includes a contactor, a first liquid level switch and a second liquid level switch respectively connected to the contactor; both the first liquid level switch and the second liquid level switch are arranged in the cooling tower; the pressure sensor is arranged on the first water replenishing pipe;

[0006] The frequency conversion control cabinet is used to adjust the output frequency according to the cooling water information and adjust the rotation speed of the water replenishing pump according to the adjusted output frequency.

[0007] Further, the frequency conversion control cabinet further includes a controller and a frequency converter connected in sequence; the pressure sensor is connected to the controller;

[0008] The pressure sensor is used to monitor the pressure in the first water replenishing pipe, obtain a pressure analog signal, and send the pressure analog signal to the controller;

[0009] The controller is used to convert the pressure analog signal into a pressure value, and adjust the output frequency of the variable frequency speed regulator according to the pressure value and the preset pressure standard value;

[0010] The variable frequency speed regulator is used to adjust the speed of the makeup water pump according to the adjusted output frequency, and then adjust the pressure in the first makeup water pipe so that the pressure in the first makeup water pipe meets the pressure standard value.

[0011] Further, the distance between the first liquid level switch and the bottom surface of the cooling tower is the first height, the distance between the second liquid level switch and the bottom surface of the cooling tower is the second height, the first height is greater than the second height, and both the first liquid level switch and the second liquid level switch are connected to the variable frequency speed regulator through a contactor;

[0012] The second liquid level switch is used to send a first digital signal to the contactor when it detects that the liquid level height in the cooling tower is less than the second height; the first liquid level switch is used to send a second digital signal to the contactor when it detects that the liquid level height in the cooling tower is less than the first height;

[0013] The second liquid level switch is used to send a third digital signal to the contactor when it detects that the liquid level height in the cooling tower is not less than the second height; the first liquid level switch is used to send a fourth digital signal to the contactor when it detects that the liquid level height in the cooling tower is not less than the first height;

[0014] The contactor is used to connect to the variable frequency speed regulator when receiving the first digital signal and the second digital signal, so that the makeup water pump starts to run;

[0015] The contactor is also used to keep connected to the variable frequency speed regulator when receiving the third digital signal and the second digital signal, so that the makeup water pump continues to run;

[0016] The contactor is also used to disconnect from the variable frequency speed regulator when receiving the third digital signal and the fourth digital signal, so that the makeup water pump stops running.

[0017] Further, the makeup water device further includes a timing module, and the timing module is connected to the controller;

[0018] The timing module is used to start timing when the pressure value is not less than the pressure standard value and the output frequency of the variable frequency speed regulator is not greater than the preset frequency, and send the timing time to the controller in real time;

[0019] The controller is used to obtain the timing time in real time, and control the makeup water pump to stop running when the timing time reaches the preset time setting value.

[0020] Further, the makeup water device further includes a makeup water tank, and the makeup water tank is connected to the makeup water pump through a second makeup water pipe;

[0021] The make-up water pump is also used to pump the water in the make-up water tank into the cooling tower at the adjusted speed, so that the pressure in the first make-up water pipe meets the pressure standard value.

[0022] Furthermore, the make-up water device further includes a buffer tank, and the buffer tank is communicated with the first make-up water pipe;

[0023] The buffer tank is used to adjust the pressure in the first make-up water pipe to meet the pressure standard value when the water consumption of the cooling tower is less than the preset water volume.

[0024] Furthermore, the controller is also used to reduce the output frequency of the variable frequency speed regulator when the pressure value is not less than the pressure standard value, and increase the output frequency of the variable frequency speed regulator when the pressure value is less than the pressure standard value.

[0025] Furthermore, the make-up water device further includes a swirl preventer, and the swirl preventer is arranged at the bottom of the make-up water tank and is connected to the second make-up water pipe;

[0026] The swirl preventer is used to prevent the generation of swirl in the make-up water tank.

[0027] Furthermore, the make-up water device further includes an overflow pipe, and the overflow pipe is communicated with the make-up water tank and is used to discharge the water in the make-up water tank exceeding the set water level from the make-up water tank;

[0028] The outlet of the overflow pipe is wrapped with 18-mesh copper or stainless steel wire for protecting the overflow pipe.

[0029] Furthermore, the make-up water device further includes a power supply module, and the power supply module is connected to the make-up water pump for supplying power to the make-up water pump.

[0030] The embodiment of the utility model brings the following beneficial effects:

[0031] A make-up water device provided by the embodiment of the utility model includes a signal acquisition module, a variable frequency control cabinet, and a make-up water pump which are connected in sequence; the make-up water pump is connected to the cooling tower through a first make-up water pipe; the signal acquisition module is used to acquire the cooling water information associated with the cooling tower and send the cooling water information to the variable frequency control cabinet; the signal acquisition module includes: a pressure sensor and / or a liquid level switch module; the liquid level switch module includes a contactor, and a first liquid level switch and a second liquid level switch which are respectively connected to the contactor; both the first liquid level switch and the second liquid level switch are arranged in the cooling tower; the pressure sensor is arranged on the first make-up water pipe; the make-up water device uses the signal acquisition module to replace the electric contact pressure gauge in the prior art, so that the variable frequency control cabinet can automatically adjust the output frequency based on the cooling water information acquired by the pressure sensor and / or the liquid level switch module, thereby adjusting the speed of the make-up water pump and avoiding the frequent start and stop of the make-up water pump during the make-up water process of the cooling tower.

[0032] Other features and advantages of the present utility model will be described in the subsequent specification, or, some features and advantages can be inferred from the specification or be undoubtedly determined, or can be learned by implementing the above technologies of the present disclosure.

[0033] To make the above objects, features, and advantages of the present disclosure more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes the following detailed description. Brief Description of the Drawings

[0034] To more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] Figure 1 Structural schematic diagram of a water replenishing device provided by an embodiment of the present utility model;

[0036] Figure 2 Structural schematic diagram of another water replenishing device provided by an embodiment of the present utility model;

[0037] Figure 3 Structural schematic diagram of another water replenishing device provided by an embodiment of the present utility model;

[0038] Figure 4 Structural schematic diagram of another water replenishing device provided by an embodiment of the present utility model;

[0039] Figure 5 Structural schematic diagram of another water replenishing device provided by an embodiment of the present utility model;

[0040] Figure 6 Circuit schematic diagram of a contactor provided by an embodiment of the present utility model;

[0041] Figure 7 Structural schematic diagram of another water replenishing device provided by an embodiment of the present utility model;

[0042] Figure 8 Structural schematic diagram of another water replenishing device provided by an embodiment of the present utility model;

[0043] Figure 9 Structural schematic diagram of another water replenishing device provided by an embodiment of the present utility model;

[0044] Figure 10 Structural schematic diagram of another water replenishing device provided by an embodiment of the present utility model;

[0045] Figure 11 Structural schematic diagram of another water replenishing device provided by an embodiment of the present utility model;

[0046] Figure 12 Structural schematic diagram of another water replenishing device provided by an embodiment of the present utility model;

[0047] Icon:

[0048] 01 - Signal acquisition module; 011 - Pressure sensor; 012 - Liquid level switch module; 0121 - Contactor; 0122 - First liquid level switch; 0123 - Second liquid level switch; 02 - Variable frequency control cabinet; 021 - Controller; 022 - Variable frequency speed regulator; 03 - Make-up water pump; 04 - First make-up water pipe; 05 - Cooling tower; 06 - Timing module; 07 - Make-up water tank; 08 - Second make-up water pipe; 09 - Buffer tank; 10 - Anti - swirl device; 11 - Overflow pipe; 12 - Power supply module. Detailed implementation manners

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0050] Based on this, an embodiment of the present utility model provides a water replenishing device, including a signal acquisition module 01, a variable frequency control cabinet 02, and a make-up water pump 03 that are connected in sequence; wherein, the make-up water pump 03 is connected to the cooling tower 05 through a first make-up water pipe 04.

[0051] The signal acquisition module 01 is used to collect cooling water information associated with the cooling tower 05 and send the cooling water information to the variable frequency control cabinet 02;

[0052] The variable frequency control cabinet 02 is used to adjust the output frequency according to the cooling water information and adjust the rotation speed of the make-up water pump 03 according to the adjusted output frequency. Among them, the signal acquisition module 01 includes: a pressure sensor 011 and / or a liquid level switch module 012.

[0053] In practical applications, the cooling water information associated with the cooling tower collected by the above - mentioned signal acquisition module may include the pressure in the first make-up water pipe monitored by the pressure sensor, and / or the liquid level in the cooling tower monitored by the first liquid level switch and the second liquid level switch.

[0054] The above - mentioned variable frequency control cabinet and make-up water pump may be arranged on a base. Specifically, the base may be arranged on the ground foundation in the underground pump house; the above - mentioned cooling tower may be arranged on the roof of the chiller room.

[0055] The above frequency conversion control cabinet is mainly used to adjust the working frequency of the make-up water pump, reduce energy consumption, and can start the make-up water pump smoothly, reducing the damage to the motor caused by the large current generated when the make-up water pump starts directly. At the same time, it has an analog input (for speed control or feedback signal) and PID control.

[0056] The above make-up water pump includes a motor. According to the frequency output by the frequency conversion control cabinet, the motor speed can be adjusted, thereby adjusting the water volume pumped into the first make-up water pipe and the cooling tower through the make-up water pump, and then changing the pressure in the first make-up water pipe and the liquid level in the cooling tower.

[0057] In one embodiment, as shown in Figure 1 In order to achieve cost savings, the above signal acquisition module 01 may only include a pressure sensor 011, and the pressure sensor 011 is arranged on the first make-up water pipe 04 (equivalent to being connected to the first make-up water pipe 04).

[0058] The above pressure sensor can be arranged on the outer wall of the first make-up water pipe. This pressure sensor (Pressure Transducer) can be understood as a device or apparatus composed of a pressure-sensitive element and a signal processing unit, which can sense the pressure signal and convert the pressure signal into an available output analog signal according to a certain rule.

[0059] In the specific implementation process, the pressure sensor can input the pressure monitored on the pipeline to the frequency conversion control cabinet of the cooling tower make-up water pump in the form of an analog signal. The frequency conversion control cabinet calculates through the measured pipeline pressure (equivalent to the pressure analog signal), adjusts the output frequency, and then adjusts the speed of the make-up water pump, and can realize the variable frequency constant pressure water supply of the pipe network.

[0060] This embodiment can control the frequent start and stop of the make-up water pump through the pressure sensor and the frequency conversion control cabinet. The frequency conversion control cabinet can adjust the output frequency according to the pressure analog signal collected by the pressure sensor to adjust the motor speed, thereby adjusting the water volume pumped into the make-up water pipe and the cooling tower through the make-up water pump, and then changing the pressure in the make-up water pipe, achieving the advantages of saving production costs and preventing the make-up water pump from starting and stopping frequently.

[0061] In one embodiment, as shown in Figure 2 In order to achieve cost savings and energy-saving water replenishment, the above signal acquisition module 01 may also only include a liquid level switch module 012; the liquid level switch module 012 includes a contactor 0121, and a first liquid level switch 0122 and a second liquid level switch 0123 respectively connected to the contactor 0121; both the first liquid level switch 0122 and the second liquid level switch 0123 are arranged in the cooling tower 05.

[0062] The above-mentioned contactor is an electrical control device that can be used to control the start and stop of the make-up water pump motor. The above-mentioned first liquid level switch and second liquid level switch, as a control switch, can output switch signals (i.e., digital signals 0 or 1), and these signals usually include two switch points of high liquid level and low liquid level.

[0063] In the specific actual process, the first liquid level switch and the second liquid level switch can detect the liquid level in the cooling tower. When the liquid level reaches or exceeds these set points, the corresponding switch will close or open, causing the contactor to close or open, triggering the frequency of the variable frequency control cabinet to rise to 50HZ for full-frequency start-up operation or the frequency to drop to 0HZ for stop operation, thereby triggering the start / stop of the make-up water pump. Common liquid level switches include tuning fork liquid level switches, float ball liquid level switches, magnetic switches, etc. The types of the above-mentioned first liquid level switch and second liquid level switch can be specifically selected according to the actual situation.

[0064] This embodiment can control the frequent start and stop of the make-up water pump through the first liquid level switch, the second liquid level switch, the contactor and the variable frequency control cabinet. According to the switch signals output by the first liquid level switch and the second liquid level switch, the frequency output by the variable frequency control cabinet can be changed to control the rotation speed of the make-up water pump to control the start and stop of the make-up water pump, thereby adjusting the amount of water pumped into the cooling tower by the make-up water pump, and then changing the liquid level in the cooling tower, achieving the advantages of saving production costs, energy-saving water replenishment, and preventing the make-up water pump from starting and stopping frequently.

[0065] In one embodiment, as shown in Figure 3 In order to achieve cost savings and energy-saving water replenishment, the above-mentioned signal acquisition module 01 may further include a pressure sensor 011 and a liquid level switch module 012.

[0066] This embodiment can control the frequent start and stop of the make-up water pump through the pressure sensor, the first liquid level switch, the second liquid level switch, the contactor and the variable frequency control cabinet. When the pressure sensor fails, the frequent start and stop of the make-up water pump can still be controlled through the first liquid level switch and the second liquid level switch, thus avoiding the defect that when the pressure sensor is used alone for control, the frequent start and stop of the make-up water pump cannot be effectively controlled due to the failure of the pressure sensor.

[0067] A water replenishing device provided by the utility model comprises a signal acquisition module, a frequency conversion control cabinet, and a water replenishing pump that are connected in sequence; the water replenishing pump is connected to a cooling tower through a first water replenishing pipe; the signal acquisition module is used for acquiring cooling water information associated with the cooling tower and sending the cooling water information to the frequency conversion control cabinet; the signal acquisition module includes: a pressure sensor and / or a liquid level switch module; the liquid level switch module includes a contactor, and a first liquid level switch and a second liquid level switch that are respectively connected to the contactor; both the first liquid level switch and the second liquid level switch are arranged in the cooling tower; the pressure sensor is arranged on the first water replenishing pipe; this water replenishing device uses the signal acquisition module to replace the electric contact pressure gauge in the prior art, enabling the frequency conversion control cabinet to automatically adjust the output frequency based on the cooling water information acquired by the pressure sensor and / or the liquid level switch module, thereby adjusting the rotation speed of the water replenishing pump and avoiding the frequent start and stop of the water replenishing pump during the water replenishing process of the cooling tower.

[0068] In one embodiment, as shown in Figure 4 Figure, the frequency conversion control cabinet 02 further includes a controller 021 and a variable frequency speed regulator 022 that are connected in sequence; when the signal acquisition module 01 includes a pressure sensor 011, the pressure sensor 011 is connected to the controller 021.

[0069] The pressure sensor 011 is used for monitoring the pressure in the first water replenishing pipe 04, obtaining a pressure analog signal, and sending the pressure analog signal to the controller 021.

[0070] The controller 021 is used for converting the pressure analog signal into a pressure value and adjusting the output frequency of the variable frequency speed regulator 022 according to the pressure value and a preset pressure standard value;

[0071] wherein, the controller 021 is further used for when the pressure value is not less than the pressure standard value, reducing the output frequency of the variable frequency speed regulator 022, and when the pressure value is less than the pressure standard value, increasing the output frequency of the variable frequency speed regulator 022.

[0072] The variable frequency speed regulator 022 is used for adjusting the rotation speed of the water replenishing pump 03 according to the adjusted output frequency, and further adjusting the pressure in the first water replenishing pipe 04 so that the pressure in the first water replenishing pipe 04 meets the pressure standard value.

[0073] The above-mentioned pressure standard value can be set according to the pressure thresholds corresponding to the shutdown and startup of the water replenishing pump obtained in advance according to the actual on-site operating conditions. Specifically, according to the actual on-site operating conditions, it can be obtained that the water replenishing pump generally starts when the pressure value is lower than 0.18 Mpa and stops when the pressure value is higher than 0.22 Mpa, and the above-mentioned pressure standard value can be selected from the formed interval (0.18 Mpa, 0.22 Mpa) according to actual needs. For example, 0.20 Mpa can be used as the above-mentioned pressure standard value.

[0074] The above-mentioned variable-frequency control cabinet is a complete set of equipment integrating various control functions and circuit protection, mainly used for centralized control and protection of motors. The variable-frequency control cabinet usually includes a variable-frequency speed regulator, as well as related control circuits (controllers) and protection circuits (circuit breakers), which can control and protect the motor. Among them, the core equipment of the variable-frequency control cabinet is the variable-frequency speed regulator. The speed of the motor mainly depends on the power supply frequency. By adjusting the output frequency of the variable-frequency speed regulator, the speed of the motor can be changed.

[0075] In the specific implementation process, the above-mentioned controller is generally a PID regulator, which is a feedback system controller widely used in control engineering. "PID" represents proportional (P), integral (I), and derivative (D). The PID controller uses a sensor to measure the difference between the process variable (equivalent to the above-mentioned pressure value) and the expected value (equivalent to the pressure standard value), and stabilizes this difference and makes it approach zero (equivalent to making the pressure in the first make-up water pipe 04 meet the pressure standard value) by dynamically adjusting the control signal.

[0076] Specifically, the PID controller generates an output control signal to the variable-frequency speed regulator based on the difference between the pressure value and the pressure standard value, which is synthesized by three parts: proportional, integral, and derivative, to control the output frequency of the variable-frequency speed regulator and thus control the speed of the make-up water pump motor, so as to minimize the error, that is, to make the pressure in the first make-up water pipe 04 as equal as possible to the pressure standard value. Among them, the proportional coefficient P is proportional to the error, the integral coefficient I accumulates the previous errors to reduce the continuous error, and the derivative coefficient D predicts the future trend based on the speed of the error and reduces the rapidly changing error.

[0077] In the specific actual process, the pressure sensor can input the pressure monitored on the pipeline to the variable-frequency control cabinet of the cooling tower make-up water pump in the form of an analog signal. The variable-frequency control cabinet calculates through the measured pipeline pressure (equivalent to the above-mentioned pressure analog signal) by the built-in PID regulator, adjusts the output frequency, and then adjusts the speed of the make-up water pump, so as to realize variable-frequency constant-pressure water supply for the pipe network. Specifically, the variable-frequency control cabinet controls the pipe network pressure online. When the pipe network pressure reaches the set value (equivalent to the above-mentioned pressure standard value), it gradually reduces the speed of the make-up water pump. When the pipe network pressure does not reach the set value, it gradually increases the speed of the make-up water pump until it reaches the set value.

[0078] The above-mentioned make-up water device replaces the electric contact pressure gauge on the make-up water pipe with a pressure sensor. Due to the corresponding pressure value signal parameters caused by the instantaneous change value of the flow rate, after the PID regulator of the variable-frequency controller of the cooling tower make-up water pump processes the pressure analog quantity, it can control the variable-frequency speed regulator to automatically adjust the water pump speed, so as to maintain a set constant pressure in the make-up water pipe network, which has the advantage of not causing the make-up water pump to start and stop frequently.

[0079] Specifically, digital quantity is a kind of physical quantity. Its change is discontinuous in time and always occurs at a series of discrete instants. It is also called switch quantity. For example, the switch signal 0 / 1 output by the electric contact pressure gauge causes the make-up water pump to start and stop immediately after receiving the digital quantity signal. An analog quantity refers to a quantity whose variable changes continuously within a certain range, that is, it can take any value within a certain range (domain of definition). For example, the signal input from the pressure sensor to the frequency conversion controller is an analog continuous signal. Therefore, the frequency conversion operation of the make-up water pump can be within a range interval instead of starting and stopping immediately.

[0080] By replacing the electric contact pressure gauge with a pressure sensor in the above-mentioned make-up water device, an analog quantity signal can be used to interlock the frequency conversion control cabinet of the cooling tower make-up water pump, thereby realizing the interlock control of the make-up water pump to operate in a constant pressure and variable frequency water supply mode, overcoming the defect that in the on-site commissioning stage and the certification test stage, due to the large pressure fluctuation in the make-up water pipeline in the prior art, using digital quantity to control the start and stop of the interlocked make-up water pump causes the make-up water pump to start and stop frequently.

[0081] Furthermore, the process of automatically adjusting the speed of the make-up water pump by the analog quantity control frequency converter in this application is simple, and it is convenient to replace the pressure sensor element, which can improve the commissioning efficiency of the refrigeration system and bring social and economic benefits to the construction of the data center.

[0082] The make-up water device provided by the above embodiment includes a pressure sensor, a controller, a frequency converter, and a make-up water pump connected in sequence; the make-up water pump is connected to the cooling tower through a first make-up water pipe; the pressure sensor is arranged on the first make-up water pipe and is used to monitor the pressure in the first make-up water pipe, obtain a pressure analog signal, and send the pressure analog signal to the controller; the controller is used to receive the pressure analog signal and output a signal to the frequency converter according to the pressure analog signal and a preset pressure standard value. At this time, the frequency converter adjusts the output frequency so that the pressure in the first make-up water pipe meets the pressure standard value. This make-up water device uses a pressure sensor to replace the electric contact pressure gauge in the prior art, which can make the frequency conversion control cabinet automatically adjust the output frequency based on the pressure analog signal collected by the pressure sensor, so that the pressure of the make-up water pipe is maintained at a constant value, avoiding the frequent start and stop of the make-up water pump during the cooling tower make-up water process.

[0083] In one embodiment, as shown in Figure 5 When the signal acquisition module 01 includes a first liquid level switch 0122, a second liquid level switch 0123, and a contactor 0121, the distance between the first liquid level switch 0122 and the bottom surface of the cooling tower 05 (that is, the bottom of the water collecting tray in the cooling tower) is the first height, and the distance between the second liquid level switch 0123 and the bottom surface of the cooling tower 05 is the second height. The first height is greater than the second height. Both the first liquid level switch 0122 and the second liquid level switch 0123 are connected to the frequency converter 022 through the contactor 0121.

[0084] The second liquid level switch 0123 is used to send a first digital signal to the contactor 0121 when the liquid level height in the cooling tower 05 is detected to be less than the second height; the first liquid level switch 0122 is used to send a second digital signal to the contactor 0121 when the liquid level height in the cooling tower 05 is detected to be less than the first height; the second liquid level switch 0123 is used to send a third digital signal to the contactor 0121 when the liquid level height in the cooling tower 05 is detected to be not less than the second height; the first liquid level switch 0122 is used to send a fourth digital signal to the contactor 0121 when the liquid level height in the cooling tower 05 is detected to be not less than the first height.

[0085] The contactor 0121 is used to connect to the variable frequency speed regulator 022 when receiving the first digital signal and the second digital signal, so as to start the operation of the make-up water pump 03; the contactor 0121 is also used to maintain the connection with the variable frequency speed regulator 022 when receiving the third digital signal and the second digital signal, so as to continue the operation of the make-up water pump 03; the contactor 0121 is also used to disconnect from the variable frequency speed regulator 022 when receiving the third digital signal and the fourth digital signal, so as to stop the operation of the make-up water pump 03.

[0086] The above-mentioned first height and second height can be set according to the actual height of the water collecting tray in the cooling tower.

[0087] It should be noted that the above-mentioned liquid level switch is not equivalent to the liquid level sensor. In fact, if it is necessary to measure whether a certain liquid level is reached, a liquid level switch is generally used, while if it is necessary to accurately measure the height of the liquid level, a liquid level sensor is generally used. The liquid level switch is a switch control circuit, while the liquid level sensor is a circuit component equivalent to a transformer or a current transformer. The liquid level switch is a switch on the container, which gives an action signal when the liquid level reaches.

[0088] The above-mentioned contactor is an electrical control device that can be used to control the start and stop of the make-up water pump motor. Specifically, the contactor mainly includes a coil, main contacts, auxiliary contacts, normally open contacts and normally closed contacts. As Figure 6 shown in the circuit schematic diagram of a contactor, the normally closed contact SB1, the normally open contact SB2 and the coil KM are connected in series in sequence and then connected in parallel with the 3 main contacts T1, T2, T3 to form a main circuit. The coil KM is also connected in parallel with the auxiliary contact T4 to form a self-locking control circuit. When the coil is powered on, all the main contacts and auxiliary contacts are closed, thus connecting the circuit. When the coil is powered off, all the main contacts and auxiliary contacts are opened, thus cutting off the circuit.

[0089] In the specific implementation process, the on-off of the main contacts connected to the main circuit can be controlled by controlling the on-off of the auxiliary contacts connected to the control circuit, so as to achieve the purpose of controlling the start and stop of the make-up water pump.

[0090] Specifically, the first liquid level switch can be connected to the normally closed point of the contactor, and the second liquid level switch can be connected to the normally open point of the contactor. Assuming that the first height is 0.4 meters from the bottom of the water collecting tray and the second height is 0.2 meters from the bottom of the water collecting tray, during the process of filling water into the cooling tower, the liquid level in the cooling tower will rise. When the second liquid level switch monitors that the liquid level in the cooling tower has not risen to 0.2 meters, it can send a first digital signal (which can be understood as digital signal 1) to the contactor to make the normally open point of the contactor in a closed state. Since the liquid level in the cooling tower has not reached 0.2 meters, it must not have reached 0.4 meters either. At this time, the first liquid level switch can send a second digital signal (which can be understood as digital signal 1) to the contactor to make the normally closed point of the contactor in a closed state. Since both the normally open point and the normally closed point of the contactor are in a closed state, the coil can be energized, the main contacts and the auxiliary contacts are both closed, and the variable frequency controller can operate for speed regulation, thereby making the make-up water pump in an operating state.

[0091] When the second liquid level switch monitors that the liquid level in the cooling tower has risen to 0.2 meters, it can send a third digital signal (which can be understood as digital signal 0) to the contactor to make the normally open point of the contactor in an open state. If the first liquid level switch monitors that the liquid level in the cooling tower is still less than the second height, it can still send a second digital signal (which can be understood as digital signal 1) to the contactor to make the normally open point of the contactor in a closed state. Although the normally open point is in an open state at this time, since the normally closed point is still in a closed state, the auxiliary contact can still be in a closed state, the coil can be energized, the main contact is closed, and the variable frequency controller can operate for speed regulation, thereby making the make-up water pump still in an operating state.

[0092] If the first liquid level switch monitors that the liquid level height in the cooling tower has reached the first height, it can send a fourth digital signal (which can be understood as digital signal 0) to the contactor to make the normally closed point of the contactor in the off state; at this time, since both the normally open point and the normally closed point of the contactor are in the off state, the auxiliary contact is also in the off state, resulting in the coil being de-energized, the main contact being opened, and the frequency conversion controller unable to operate. As a result, the make-up water pump is in the shutdown state and stops replenishing water into the cooling tower. After that, if the water volume in the cooling tower is consumed, the liquid level height will drop. The first liquid level switch can still send a second digital signal (which can be understood as digital signal 1) to the contactor to make the normally open point of the contactor in the closed state. At this time, if the second liquid level switch monitors that the liquid level height in the cooling tower has not dropped below 0.2 meters, it can still send a third digital signal (which can be understood as digital signal 0) to the contactor to make the normally open point of the contactor in the off state. Although the normally closed point is in the closed state at this time, since the normally open point is still in the off state, the auxiliary contact is still in the off state, making the coil still de-energized, the main contact opened, and the frequency conversion controller unable to operate. As a result, the make-up water pump is still in the shutdown state.

[0093] At this time, if the second liquid level switch monitors that the liquid level height in the cooling tower has dropped below 0.2 meters, it can still send a first digital signal (which can be understood as digital signal 1) to the contactor to make the normally open point of the contactor in the closed state, re-energizing the coil, closing the main contact and the auxiliary contact, and thus making the make-up water pump in the running state again to replenish water into the cooling tower and increasing the liquid level height in the cooling tower.

[0094] The make-up water device provided in the above embodiment uses the first liquid level switch and the second liquid level switch to replace the electric contact pressure gauge in the prior art. The high and low liquid level signal parameters in the cooling tower can be input into the frequency converter of the make-up water pump of the cooling tower in the form of digital signals through the first liquid level switch and the second liquid level switch via the contactor to automatically adjust the pump speed and control the start or stop of the make-up water pump. Since the cooling tower is relatively high, the vertical distance between the above-mentioned first liquid level switch and the second liquid level switch is usually relatively large. Therefore, the difference between the high liquid level corresponding to the first liquid level switch and the low liquid level corresponding to the second liquid level switch is generally relatively large, making the change of the liquid level height in the cooling tower slower. Therefore, by detecting the high and low liquid level signal parameters, the frequent start and stop of the make-up water pump during the water replenishment process of the cooling tower can be avoided.

[0095] On the basis of the above embodiment, the embodiment of the present invention also provides another make-up water device. See Figure 7Schematic diagram of the structure of another water replenishing device shown. Based on the above embodiments, if the signal acquisition module 01 includes a pressure sensor 011, the water replenishing device may further include: a timing module 06, which is arranged in the frequency conversion control cabinet 02 and is connected to the controller 021; the timing module 06 is used to start timing when the pressure value is not less than the pressure standard value and the output frequency of the variable frequency speed regulator 022 is not greater than the preset frequency, and send the timing time to the controller 021 in real time; the controller 021 is used to obtain the timing time in real time, and when the timing time reaches the preset time setting value, control the water replenishing pump 03 to stop running.

[0096] The above timing module can adopt a device capable of timing, such as a timer.

[0097] The above preset time setting value can be adjusted and set in advance according to actual requirements. For example, it can be adjusted and set to 20 seconds.

[0098] The above preset frequency can also be preset according to actual requirements. Generally, it can be set to 20 Hz. When the pressure value is not less than the pressure standard value, the frequency can be reduced to 20 Hz.

[0099] In the specific implementation process, when the pressure value is not less than the pressure standard value, the frequency can be reduced to 20 Hz. If the water in the cooling tower is not consumed, that is, the pressure value in the water replenishing pipe is always not less than the pressure standard value, the water replenishing pump will always run at a running frequency of 20 Hz. However, since the water in the cooling tower is not consumed and there is no need to replenish water for the cooling tower, if the water replenishing pump runs at a running frequency of 20 Hz for a long time, it will cause unnecessary energy loss.

[0100] To reduce unnecessary energy loss, a timing module can be set. When the pressure value is not less than the pressure standard value and the output frequency of the variable frequency speed regulator is not greater than 20 Hz, the controller can send a timing signal to the timing module to make the timing module start timing, and return the timing time to the controller in real time. When the timing time received by the controller reaches 20 seconds, control the water replenishing pump to stop running; specifically, when the duration of the condition that the pressure value is not less than the pressure standard value and the output frequency of the variable frequency speed regulator is not greater than 20 Hz reaches 20 seconds, it means that the water in the cooling tower has not been consumed for a long time and there is no need to start a water replenishing pump to replenish water for the cooling tower. Therefore, after the delay monitoring, the water replenishing pump can be controlled to stop running first, so as to achieve energy-saving water replenishment.

[0101] Based on the above embodiments, the embodiment of the present invention also provides another water replenishing device. See Figure 8Schematic diagram of the structure of another water replenishing device. On the basis of the above embodiment, when the signal acquisition module 01 includes a pressure sensor 011 and / or a liquid level switch module 012, the water replenishing device further includes: a water replenishing pool 07, and the water replenishing pool 07 is connected to a water replenishing pump 03 through a second water replenishing pipe 08; the water replenishing pump 03 is further configured to pump the water in the water replenishing pool 07 into the cooling tower 05 at an adjusted rotation speed, so that the pressure in the first water replenishing pipe 04 meets the pressure standard value.

[0102] In the specific implementation process, the water replenishing pump is connected to the cooling tower through the first water replenishing pipe, the water replenishing pump is connected to the water replenishing pool through the second water replenishing pipe, and the motor of the water replenishing pump can rotate according to the adjusted rotation speed, then pump the water in the water replenishing pool through the second water replenishing pipe, and then transport it to the cooling tower through the first water replenishing pipe.

[0103] On the basis of the above embodiment, the embodiment of the present invention further provides another water replenishing device. Refer to Figure 9 Schematic diagram of the structure of another water replenishing device. On the basis of the above embodiment, the water replenishing device further includes: a buffer tank 09, the buffer tank 09 is communicated with the first water replenishing pipe 04, and the buffer tank 09 is configured to adjust the pressure in the first water replenishing pipe 04 to meet the pressure standard value when the water consumption of the cooling tower 05 is less than a preset water volume.

[0104] The above buffer tank can also be arranged on the base and communicated with the first water replenishing pipe.

[0105] The above water consumption of the cooling tower can be understood as water consumption, that is, after the cooling tower stores water, the lost water, such as evaporation loss, splash loss, discharge loss, etc. of the cooling tower.

[0106] In the specific implementation process, when the water consumed in the cooling tower is less, a part of the gas in the buffer tank can push the water up to maintain the standard pressure. Only when the water consumption is particularly large and a part of the gas in the buffer tank cannot meet the pressure requirement, the water replenishing pump is started to replenish water, thereby reducing the consumption of the pump and realizing energy-saving configuration; that is, the buffer tank can maintain the pressure of the pipe network system for a certain period of time when the water consumption of the cooling tower is small or there is no water consumption, so that all water replenishing pumps are automatically shut down; when the water consumption increases, it is automatically turned on. Without a buffer tank, the system pressure must be maintained by a water replenishing pump when the water consumption is small or there is no water consumption, consuming power.

[0107] On the basis of the above embodiment, the embodiment of the present invention further provides another water replenishing device. Refer to Figure 10 Schematic diagram of the structure of another water replenishing device. On the basis of the above embodiment, the water replenishing device further includes: a swirl preventer 10, the swirl preventer 10 is arranged at the bottom of the water replenishing pool 07 and connected to the second water replenishing pipe 08; the swirl preventer 10 is used to prevent swirl from occurring in the water replenishing pool 07.

[0108] The above-mentioned swirl preventer can be understood as a special pipe fitting used to prevent swirl in the makeup water tank during liquid transportation and prevent air from entering the pipeline.

[0109] In the specific implementation process, by installing the swirl preventer on the suction pipe port of the makeup water pump, the swirl in the makeup water tank can be eliminated as much as possible, ensuring that the water pump can always start at full power and work normally, avoiding air entering the water pump to cause cavitation, enabling the liquid level in the makeup water tank to drop to a lower level to ensure maximum flow transportation, and thus maximizing the effective volume of the makeup water tank.

[0110] The reason for the generation of swirl is that during the process of the liquid level dropping due to pipeline water absorption, the dropping rate at a certain point is greater than that of other surfaces, resulting in negative pressure at this point position, thus forming a swirl, and air will be carried into the liquid along with the swirl. The principle of the swirl preventer is to pump water from a vast space rather than a certain point. The water flows evenly through its surroundings and air inflow is avoided. This not only reduces the water flow velocity at the inlet of each surface but also enables the water surface to drop evenly, thus avoiding the generation of swirl.

[0111] Based on the above-mentioned embodiments, the embodiment of the present utility model also provides another makeup water device. Refer to Figure 11 the structural schematic diagram of another makeup water device shown. Based on the above-mentioned embodiments, the makeup water device further includes: an overflow pipe 11, which is communicated with the makeup water tank 07 and is used to discharge the water in the makeup water tank 07 that exceeds the set water level from the makeup water tank. The outlet of the overflow pipe 11 is wrapped with 18-mesh copper or stainless steel wire to protect the overflow pipe.

[0112] In the specific implementation process, the overflow pipe can be set at a position near the upper part of the outer side wall of the makeup water tank. When the water level in the makeup water tank exceeds the set water level, that is, when the water volume is too large, the excess water can be discharged through the overflow pipe to the drainage ditch.

[0113] Specifically, a drain pipe can also be set at a position near the lower part of the outer side wall of the makeup water tank. When it is necessary to drain the water in the makeup water tank according to the actual situation, the water in the makeup water tank can be discharged in large quantities through the drain pipe to the drainage ditch.

[0114] In actual implementation, generally, 18-mesh copper or stainless steel wire can be set at the pipe orifices of the above-mentioned overflow pipe and drain pipe to prevent snakes, insects, rats and other sundries from entering and causing blockage.

[0115] Based on the above-mentioned embodiments, the embodiment of the present utility model also provides another makeup water device. Refer to Figure 12Schematic structural diagram of another water replenishing device shown. On the basis of the above embodiments, the water replenishing device further includes: a power supply module 12, and the power supply module 12 is connected to the water replenishing pump for supplying power to the water replenishing pump 03.

[0116] The above power supply module can be understood as a device capable of supplying power, such as a power distribution cabinet, etc.

[0117] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0118] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0119] Finally, it should be noted that the above embodiments are only specific implementation manners of the present invention, used to illustrate the technical solutions of the present invention, rather than limiting it. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: any person skilled in the art within the technical scope disclosed by the present invention can still modify the technical solutions recorded in the foregoing embodiments or easily think of changes, or perform equivalent replacements for some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A water replenishing device, characterized in that: The water replenishment device comprises: a signal acquisition module, a frequency conversion control cabinet, and a water replenishment pump connected in sequence; wherein the water replenishment pump is connected to the cooling tower through a first water replenishment pipe; The signal acquisition module is used to collect cooling water information associated with the cooling tower and send the cooling water information to the frequency conversion control cabinet; wherein the signal acquisition module includes: a pressure sensor and / or a liquid level switch module; the liquid level switch module includes a contactor, and a first liquid level switch and a second liquid level switch respectively connected to the contactor; the first liquid level switch and the second liquid level switch are both arranged in the cooling tower; the pressure sensor is arranged on the first water supply pipe; The frequency conversion control cabinet is used to adjust the output frequency according to the cooling water information, and adjust the rotation speed of the water supply pump according to the adjusted output frequency.

2. The water replenishing device according to claim 1, characterized in that: The variable frequency control cabinet also includes a controller and a variable frequency speed regulator connected in sequence; the pressure sensor is connected to the controller; The pressure sensor is used to monitor the pressure in the first water supply pipe, obtain a pressure simulation signal, and send the pressure simulation signal to the controller; The controller is used to convert the pressure analog signal into a pressure value, and adjust the output frequency of the variable frequency speed regulator according to the pressure value and a preset pressure standard value; The variable frequency speed regulator is used to adjust the rotation speed of the water supply pump according to the adjusted output frequency, and then adjust the pressure in the first water supply pipe so that the pressure in the first water supply pipe meets the pressure standard value.

3. The water replenishing device according to claim 2, characterized in that: The distance between the first liquid level switch and the bottom surface of the cooling tower is a first height, the distance between the second liquid level switch and the bottom surface of the cooling tower is a second height, the first height is greater than the second height, and the first liquid level switch and the second liquid level switch are both connected to the variable frequency speed regulator through the contactor; The second liquid level switch is used to send a first digital signal to the contactor when the liquid level in the cooling tower is detected to be less than the second height; the first liquid level switch is used to send a second digital signal to the contactor when the liquid level in the cooling tower is detected to be less than the first height; The second liquid level switch is used to send a third digital signal to the contactor when it is detected that the liquid level in the cooling tower is not less than the second height; the first liquid level switch is used to send a fourth digital signal to the contactor when it is detected that the liquid level in the cooling tower is not less than the first height; The contactor is used to connect with the variable frequency speed regulator when receiving the first digital signal and the second digital signal, so as to start the water supply pump; The contactor is also used to maintain connection with the variable frequency speed regulator when receiving the third digital signal and the second digital signal, so that the water supply pump continues to operate; The contactor is also used to disconnect from the variable frequency speed regulator when receiving the third digital signal and the fourth digital signal, so as to stop the water supply pump.

4. The water replenishing device according to claim 2, characterized in that: The water replenishing device further comprises a timing module, and the timing module is connected to the controller; The timing module is used to start timing when the pressure value is not less than the pressure standard value and the output frequency of the variable frequency speed regulator is not greater than the preset frequency, and send the timing time to the controller in real time; The controller is used to obtain the timing time in real time, and when the timing time reaches a preset time setting value, the water replenishment pump is controlled to stop running.

5. The water replenishing device according to claim 2, characterized in that: The water replenishment device also includes a water replenishment tank, and the water replenishment tank is connected to the water replenishment pump through a second water replenishment pipe; The water supply pump is also used to pump water in the water supply tank into the cooling tower according to the adjusted rotation speed, so that the pressure in the first water supply pipe meets the pressure standard value.

6. The water replenishing device according to claim 5, characterized in that: The water replenishment device further includes a buffer tank, and the buffer tank is connected to the first water replenishment pipe; The buffer tank is used to adjust the pressure in the first water supply pipe to meet the pressure standard value when the water consumption of the cooling tower is less than the preset water consumption.

7. The water replenishing device according to claim 2, characterized in that: The controller is also used to reduce the output frequency of the variable frequency speed regulator when the pressure value is not less than the pressure standard value, and to increase the output frequency of the variable frequency speed regulator when the pressure value is less than the pressure standard value.

8. The water replenishing device according to claim 5, characterized in that: The water replenishment device further comprises a vortex preventer, which is arranged at the bottom of the water replenishment tank and connected to the second water replenishment pipe; The vortex preventer is used to prevent vortex from occurring in the water replenishment tank.

9. The water replenishing device according to claim 5, characterized in that: The water replenishment device further comprises an overflow pipe, which is in communication with the water replenishment tank and is used to discharge water in the water replenishment tank that exceeds a set water level out of the water replenishment tank; The outlet of the overflow pipe is wrapped with 18-mesh copper or stainless steel wire to protect the overflow pipe.

10. The water replenishing device according to claim 1, characterized in that: The water replenishment device also includes a power supply module, which is connected to the water replenishment pump and is used to supply power to the water replenishment pump.

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