Automatic control device for heating equipment and cooling fan in machine room

Abstract

The utility model belongs to the technical field of automatic temperature control, and particularly discloses an automatic control device for heating equipment and a cooling fan in a machine room, which comprises double temperature probes, a temperature controller, a frequency converter and an interlocking circuit, and is characterized in that the double probes are respectively mounted at the top and the bottom of the machine room, acquire temperature signals in real time and transmit the temperature signals to the temperature controller; the controller controls starting and stopping of the heater and the draught fan according to a preset threshold value. The first relay is closed to start the heater at low temperature, and the second relay is closed and the rotating speed of the draught fan is adjusted through the frequency converter at high temperature. The interlocking circuit physically isolates two equipment loops through a relay normally-closed contact, a time delay relay is additionally arranged, it is ensured that after the heater is started, a fan loop is disconnected in a delayed mode, and hedging of cold airflow and hot airflow is avoided.

Description

Technical Field

[0001] This utility model relates to the field of automatic temperature control technology, specifically to an automatic control device for computer room heating equipment and cooling fans. Background Technology

[0002] In the electrolytic aluminum industry and other industrial settings, enclosed spaces such as computer rooms, control rooms, and power distribution rooms need to maintain suitable temperatures to ensure the normal operation of equipment. Currently, computer room temperature control largely relies on manual intervention: cooling is achieved through fans in summer and heating through heaters in winter. However, the fans and heaters are not connected to automatic control systems, relying on manual start-up and shutdown, resulting in slow response and low efficiency.

[0003] Patent CN213901323U discloses a fan room heat dissipation device, including a main body of the fan room, a cold water chamber, a drying chamber, and a main unit chamber. The cold water chamber is located inside and outside the main body of the fan room. This utility model relates to the field of fan room heat dissipation technology. The internal structure of this design is simple. The cold water chamber can store cold water, thereby actively dissipating heat from the inside of the main body of the fan room.

[0004] The above solution is only for heat dissipation and cannot raise the temperature, thus failing to fully realize intelligent temperature regulation. Utility Model Content

[0005] The purpose of this utility model is to provide an automatic control device for computer room heating equipment and radiator fans, so as to solve the problem that the fans and heaters are not connected to the automatic control system, rely on manual start and stop, and have slow response and low efficiency.

[0006] To achieve the above objectives, the basic solution provided by this utility model is as follows: an automatic control device for computer room heating equipment and a cooling fan, including a first temperature probe, a second temperature probe, a temperature controller, a frequency converter, a changeover switch, and an interlock circuit. The output terminal of the first temperature probe is connected to the first signal input terminal of the temperature controller, the output terminal of the second temperature probe is connected to the second signal input terminal of the temperature controller, the first control output terminal of the temperature controller is connected to the power circuit of the heater through a first relay, and the second control output terminal of the temperature controller is connected to the fan control circuit through a second relay.

[0007] The interlock circuit includes a normally closed auxiliary contact of a first relay, which is connected in series in the fan control circuit. The second relay has a second normally closed auxiliary contact, which is connected in series in the heater power circuit.

[0008] The inverter input terminal is connected to the speed control signal output terminal of the temperature controller, and the inverter output terminal is connected to the three-phase power input terminal of the fan motor through the main contacts of the second relay.

[0009] The common terminal of the changeover switch is connected to the enable terminal of the temperature controller, the first switching terminal is connected to the automatic control signal source, and the second switching terminal is connected to the start / stop button of the manual control panel.

[0010] The principle and beneficial effects of this invention are as follows: Dual temperature probes collect temperature signals at different heights in the computer room in real time. The temperature controller determines whether to trigger the heater or the fan based on a preset threshold. When the temperature is below the lower limit, the temperature controller closes the first relay to start the heater; when the temperature is above the upper limit, the second relay closes and the fan speed is adjusted via the frequency converter. The interlock circuit ensures that the heater and the fan do not work simultaneously through the relay auxiliary contacts, and the manual command is executed first when the switch changes modes.

[0011] Option 2, a preferred embodiment of the basic scheme, involves a threshold storage module for the temperature controller connected to an EEPROM chip via an SPI data bus. The EEPROM chip stores upper and lower temperature thresholds. The first control output is configured to close a first relay when the detected temperature is below the lower threshold, and the second control output is configured to close a second relay when the detected temperature is above the upper threshold. The EEPROM chip stores programmable threshold data and communicates with the temperature controller in real-time via the SPI bus. The temperature controller dynamically adjusts its control logic based on the stored thresholds, for example, lowering the lower threshold in winter and raising the upper threshold in summer.

[0012] Option 3, a preferred option of the basic scheme, connects the signal input terminal of the frequency converter to the output pin of the temperature controller via an optocoupler isolation module. The power supply terminal of the optocoupler isolation module is connected to an isolation power supply. The three-phase output terminal of the frequency converter is connected to the fan motor via an LC filter. The optocoupler isolation module isolates the signal from the temperature controller from the high-voltage circuit of the frequency converter to prevent electromagnetic interference, and the LC filter removes high-frequency harmonics from the frequency converter output, ensuring a smooth input voltage to the fan motor.

[0013] Option 4, a preferred option of the basic scheme, includes a heater forced start button and a fan forced start button. The normally open contacts of the buttons are connected in parallel to the coil circuit of the corresponding relays. In manual mode, pressing the button directly closes the coil circuit of the corresponding relay, forcibly starting or stopping the heater or fan. A diode prevents the automatic control signal from flowing back into the manual circuit, avoiding signal conflict.

[0014] Option 5, a preferred option of the basic scheme, adds a time-delay relay to the interlock circuit. The coil of this time-delay relay is connected in parallel with the coil of the first relay, and its normally open contact is connected in series with the front end of the coil of the second relay in the fan control circuit. A positive temperature coefficient thermistor is connected in series in the heater power supply circuit. After the heater starts, the time-delay relay keeps the fan circuit disconnected for 3-5 seconds to prevent cold air from directly impacting the hot airflow. The thermistor's resistance increases as the heater temperature rises, automatically limiting the current and preventing overload. Attached Figure Description

[0015] Figure 1 This is a circuit connection diagram of an automatic control device for a computer room heating equipment and a cooling fan according to this utility model.

[0016] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle. Detailed Implementation

[0017] The present invention will be further described in detail below through specific embodiments:

[0018] The reference numerals in the accompanying drawings include: 101-first temperature probe, 102-second temperature probe, 2-temperature controller, 3-frequency converter, 4-heater, 5-fan, 6-changeover switch, 7-EEPROM chip, 8-optical isolation module, 9-LC filter, 10-first relay, 11-second relay, 12-time delay relay, 13-positive temperature coefficient thermistor.

[0019] Example

[0020] like Figure 1 and Figure 2The diagram shows an automatic control device for a computer room heating system and a cooling fan. It includes a first temperature probe 101, a second temperature probe 102, a temperature controller 2, a frequency converter 3, a changeover switch 6, and an interlock circuit. The outputs of the first and second temperature probes 101 and 102 are connected to the temperature controller 2. The OU12 pin of the temperature controller 2 is connected to the coil of the first relay 10; the OUT2 pin is connected to the coil of the second relay 11; the PWM_OUT pin is connected to the input of an optocoupler isolation module 8; and the output of the optocoupler isolation module 8 is connected to the PWM IN pin of the frequency converter 3. The main contact 10-NO of the first relay 10 is connected to the power supply of the heater 4. A thermistor 13 is connected in series in the heater 4 circuit. The main contact of the second relay 11 is connected to the input of the frequency converter 3; the output of the frequency converter 3 is connected to an LC filter 9; and the output of the LC filter 9 is connected to the fan 5. A wire is drawn from the single-phase power supply L1 and splits into two branches, which are connected to the A1 terminals of the first relay 10 coil and the A1 terminal of the time delay relay 12 coil, respectively. A wire is drawn from the single-phase power supply N and splits into two branches, which are connected to the A2 terminals of the first relay 10 coil and the A2 terminal of the time delay relay 12 coil, respectively. A wire is drawn from the three-phase power supply L1 and connected to the COM terminal of the normally open contact of the time delay relay 12. The NO terminal of the normally open contact of the time delay relay 12 is connected to the A1 pin of the second relay 11 coil via a wire. The A2 pin of the second relay 11 coil is connected to the N terminal of the three-phase power supply.

[0021] The implementation method of this embodiment is as follows: The first temperature probe 101 and the second temperature probe 102 are respectively installed at the top and bottom of the computer room to collect temperature signals in real time. The probe output is connected to the input of the temperature controller 2 through a shielded signal line. The temperature controller 2 communicates with the external EEPROM chip 7 through the SPI bus to read the preset upper and lower temperature thresholds (lower limit 18℃, upper limit 28℃) and makes logical judgments based on the real-time temperature signals. When either temperature probe detects that the computer room temperature is lower than the lower threshold, the first control output of the temperature controller 2 closes the coil circuit of the first relay 10. The main contacts of the first relay 10 close, and the heater 4 is connected to a single-phase power supply (AC 220V) to start heating; the normally closed auxiliary contact 10-NC of the first relay opens at the same time, cutting off the fan control circuit to ensure that the fan cannot start. When the temperature is higher than the upper threshold, the second control output of the temperature controller 2 closes the coil circuit of the second relay 11 and outputs a PWM speed regulation signal to the frequency converter 3. When the main contact of the second relay 11 is closed, the three-phase power supply (AC 380V) is output to the fan 5 motor via the frequency converter 3 and LC filter 9; when the normally closed auxiliary contact 11-NC of the second relay 11 is opened, the heater control circuit is cut off to prevent thermal conflict; the frequency converter 3 dynamically adjusts the fan speed according to the temperature change rate calculated by the EEPROM chip: when the temperature change rate is ≤1℃ / min, the speed is linearly adjusted.

[0022] When the temperature change rate is greater than 1℃ / min, the rotation speed is directly increased to 80% of the maximum rotation speed.

[0023] When the heater is started, the coil of time delay relay 12 is energized synchronously with the coil of first relay 10, and its normally open contact 12-NO closes after a delay of 3-5 seconds. This contact is connected in series with the front end of the coil of second relay 11 in the fan control circuit to ensure that the fan circuit is completely disconnected after the heater is started, so as to avoid cold air from hitting the hot airflow.

[0024] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An automatic control device for computer room heating equipment and cooling fans, characterized in that, It includes a first temperature probe (101), a second temperature probe (102), a temperature controller (2), a frequency converter (3), a changeover switch (6), and an interlock circuit. The output terminal of the first temperature probe (101) is connected to the first signal input terminal of the temperature controller (2), and the output terminal of the second temperature probe (102) is connected to the second signal input terminal of the temperature controller (2). The first control output terminal of the temperature controller (2) is connected to the power circuit of the heater (4) through the first relay (10), and the second control output terminal of the temperature controller (2) is connected to the control circuit of the fan (5) through the second relay (11). The interlock circuit includes a normally closed auxiliary contact (10-NC) of the first relay (10), which is connected in series in the control circuit of the fan (5). The second relay (11) is provided with a second normally closed auxiliary contact (11-NC), which is connected in series in the power supply circuit of the heater (4). The input terminal of the frequency converter (3) is connected to the speed control signal output terminal of the temperature controller (2), and the output terminal of the frequency converter (3) is connected to the three-phase power input terminal of the fan (5) motor through the main contact of the second relay (11). The common terminal of the changeover switch (6) is connected to the enable terminal of the temperature controller (2), the first switching terminal is connected to the automatic control signal source, and the second switching terminal is connected to the start / stop button of the manual control panel.

2. The automatic control device for a computer room heating system and a cooling fan according to claim 1, characterized in that... The temperature controller (2) is connected to an EEPROM chip (7) via an SPI data bus. The EEPROM chip (7) stores the upper and lower temperature thresholds.

3. The automatic control device for a computer room heating system and a cooling fan according to claim 1, characterized in that, The signal input terminal of the inverter (3) is connected to the output pin of the temperature controller (2) through the optocoupler isolation module (8). The power supply terminal of the optocoupler isolation module (8) is connected to the isolation power supply (5V). The three-phase output terminal of the inverter (3) is connected to the fan (5) through the LC filter (9).

4. The automatic control device for a computer room heating system and a cooling fan according to claim 1, characterized in that, The manual control panel includes a heater (4) forced start button and a fan (5) forced start button, and the normally open contacts of the buttons are connected in parallel in the coil circuit of the corresponding relays (10, 11).

5. The automatic control device for a computer room heating system and a cooling fan according to claim 1, characterized in that... The coil of the first relay (10) is connected in parallel with a time delay relay (12), the time delay relay (12) is connected in series with the front end of the coil of the second relay (11), and a positive temperature coefficient thermistor (13) is connected in series in the power supply circuit of the heater (4).

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