Warehouse constant temperature control system

Abstract

The utility model provides a warehouse constant temperature control system, comprising an intelligent controller and a peripheral circuit, the intelligent controller comprises M ADI interfaces and K NTC interfaces; the peripheral circuit comprises an ADI interface equipment circuit, an ADO interface equipment circuit and a temperature acquisition circuit, the ADI interface equipment circuit is electrically connected with the M ADI interfaces, the ADO interface equipment circuit is electrically connected with the N ADO interfaces, and the temperature acquisition circuit is electrically connected with the K NTC interfaces. The output end of the signal amplification circuit is electrically connected to a load, the load comprises a heat source unit or a cold source unit, and the heat source unit and the cold source unit are connected to a compressor and a water pump; the heat source unit is used for increasing the warehouse temperature when the warehouse temperature is smaller than or equal to the first critical temperature, and the cold source unit is used for reducing the warehouse temperature when the warehouse temperature is larger than or equal to the second critical temperature. When the temperature is high in summer, the temperature of the warehouse is reduced; and when the temperature is low in winter, the temperature of the warehouse is increased, so that the temperature of the warehouse is within a constant range.

Description

Technical Field

[0001] The utility model relates to the technical field of constant temperature control, in particular to a warehouse constant temperature control system. Background Art

[0002] Central air conditioners have the advantages of rapid cooling and high power, and are widely used in warehouses, large shopping malls, office buildings and hotels. Materials are stored in warehouses. In order to preserve materials for a long time, the temperature of the warehouse needs to be kept constant to avoid the warehouse temperature being too low or too high.

[0003] The existing warehouse control system has few IO interfaces, weak data integration capabilities, and needs to improve its control capabilities for multiple devices. Currently, only central air conditioning is installed in the warehouse, and the central air conditioning is manually controlled to adjust the warehouse temperature. It cannot adaptively increase or decrease the temperature according to the temperature in the warehouse, and cannot ensure that the warehouse temperature is within a constant range.

[0004] Therefore, there is a need for a warehouse constant temperature control system that can adaptively increase or decrease the temperature according to the temperature in the warehouse, thereby ensuring that the warehouse temperature is within a constant range. Utility Model Content

[0005] In order to overcome the problems existing in the related art, the purpose of the utility model is to provide a warehouse constant temperature control system, which can adaptively increase or decrease the temperature according to the temperature in the warehouse, thereby ensuring that the warehouse temperature is within a constant range.

[0006] A warehouse constant temperature control system, comprising an intelligent controller and a peripheral circuit, wherein the intelligent controller comprises M ADI interfaces and K NTC interfaces;

[0007] The peripheral circuit includes an ADI interface device circuit, an ADO interface device circuit and a temperature acquisition circuit, wherein the ADI interface device circuit is electrically connected to the M ADI interfaces, the ADO interface device circuit is electrically connected to the N ADO interfaces, and the temperature acquisition circuit is electrically connected to the K NTC interfaces;

[0008] The ADO interface device circuit includes N ADO interface device units, and the ADO interface device units include a signal comparison circuit, a switch control circuit and a signal amplification circuit;

[0009] The output end of the signal amplification circuit is electrically connected to a load, and the load includes a heat source unit or a cold source unit, and the heat source unit and the cold source unit are connected to a compressor and a water pump; the heat source unit is used to increase the warehouse temperature when the warehouse temperature is less than or equal to a first critical temperature, and the cold source unit is used to reduce the warehouse temperature when the warehouse temperature is greater than or equal to a second critical temperature.

[0010] In a preferred technical solution of the present invention, when the ambient temperature is less than 15 degrees Celsius and the warehouse temperature is less than or equal to 15 degrees Celsius, the heat source unit is started, the first water supply temperature of the water pump is 45 degrees Celsius, and the first return water temperature of the water pump is 40 degrees Celsius.

[0011] In a preferred technical solution of the present utility model, when the ambient temperature is greater than 20 degrees Celsius and the warehouse temperature is greater than or equal to 20 degrees Celsius, the cold source unit is started, the second water supply temperature of the water pump is 7 degrees Celsius, and the second return water temperature of the water pump is 12 degrees Celsius.

[0012] In a preferred technical solution of the utility model, the heat source unit includes a blower and a surface cooler. In heating mode or cooling mode, the blower supplies air at full frequency and full load, and the opening percentage of the electric regulating valve of the surface cooler is dynamically adjustable.

[0013] In a preferred technical solution of the utility model, the load also includes a humidifier, the input end of the humidifier is electrically connected to the water replenishment flow switch, and the output end of the humidifier is electrically connected to the humidity alarm; the humidifier opens the water replenishment solenoid valve in the humidification mode, and controls the humidity alarm according to the feedback of the water replenishment flow switch.

[0014] In a preferred technical solution of the present invention, the input end of the signal comparison circuit is electrically connected to the PWM signal port, the output end of the signal comparison circuit is electrically connected to the input end of the switch control circuit, and the output end of the switch control circuit is electrically connected to the input end of the signal amplification circuit.

[0015] In a preferred technical solution of the utility model, the signal comparison circuit includes a Schmitt trigger, and the switch control circuit includes an operational amplifier, a first switch control resistor and a second switch control resistor; the input end of the Schmitt trigger is electrically connected to the PWM signal port, and the output end of the Schmitt trigger is electrically connected to the non-inverting input end of the operational amplifier through the first switch control resistor and the second switch control resistor.

[0016] In a preferred technical solution of the utility model, the signal amplifying circuit includes a transistor and a first signal amplifying resistor, the base of the transistor is electrically connected to the output end of the operational amplifier; the collector of the transistor is electrically connected to a first power supply, the emitter of the transistor is electrically connected to the first end of the first signal amplifying resistor, and the second end of the first signal amplifying resistor is electrically connected to the ADO interface.

[0017] In a preferred technical solution of the present utility model, the ADI interface device circuit includes M ADI interface device units, and the M ADI interface device units are independent of each other and have the same circuit structure.

[0018] In a preferred technical solution of the utility model, the ADI interface device unit includes a first resistor, a second resistor, a third resistor and a fourth resistor, the second resistor, the third resistor and the fourth resistor are connected in series, the first end of the first resistor and the first end of the second resistor are electrically connected to the ADI1 interface; the first end of the fourth resistor is electrically connected to the pAI1 interface, and the second end of the fourth resistor is grounded.

[0019] The beneficial effects of the utility model are:

[0020] The utility model provides a warehouse constant temperature control system including an intelligent controller and a peripheral circuit, wherein the intelligent controller includes M ADI interfaces and K NTC interfaces; the peripheral circuit includes an ADI interface device circuit, an ADO interface device circuit and a temperature acquisition circuit, wherein the ADI interface device circuit is electrically connected to the M ADI interfaces, the ADO interface device circuit is electrically connected to the N ADO interfaces, and the temperature acquisition circuit is electrically connected to the K NTC interfaces; the ADO interface device circuit includes N ADO interface device units, and the ADO interface device unit includes a signal comparison circuit, a switch control circuit and a signal amplification circuit; the above-mentioned warehouse constant temperature control system has more ADI interfaces and ADO interfaces, and has the advantage of being able to centrally control more loads, and the intelligent controller collects indoor parameters of different attributes according to the M ADI interfaces. The output end of the signal amplification circuit is electrically connected to the load, and the load includes a heat source unit or a cold source unit, and the heat source unit and the cold source unit are connected to a compressor and a water pump; the heat source unit is used to increase the warehouse temperature when the warehouse temperature is less than or equal to the first critical temperature, and the cold source unit is used to reduce the warehouse temperature when the warehouse temperature is greater than or equal to the second critical temperature. When the temperature is high in summer, the temperature of the warehouse is lowered; when the temperature is low in winter, the temperature of the warehouse is raised, so that the warehouse temperature is within a constant range. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the intelligent controller provided by the utility model;

[0022] Figure 2 This is a composition diagram of the warehouse constant temperature control system provided by the utility model;

[0023] Figure 3 It is a circuit diagram of the ADO interface device circuit provided by the utility model;

[0024] Figure 4 It is a circuit diagram of the ADI interface device circuit provided by the utility model;

[0025] Figure 5 It is a circuit diagram of the temperature acquisition circuit provided by the utility model;

[0026] Figure 6 It is a circuit diagram of the communication circuit provided by the utility model;

[0027] Figure 7 This is the control principle diagram of the warehouse constant temperature control system provided by the utility model;

[0028] Figure 8 It is a schematic diagram of a signal amplifying circuit control unit provided by the utility model. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0030] Example 1

[0031] like Figure 1-Figure 2 As shown, this embodiment provides a warehouse constant temperature control system, including an intelligent controller and peripheral circuits, wherein the intelligent controller includes M ADI interfaces and K NTC interfaces;

[0032] The peripheral circuit includes an ADI interface device circuit, an ADO interface device circuit and a temperature acquisition circuit, wherein the ADI interface device circuit is electrically connected to the M ADI interfaces, the ADO interface device circuit is electrically connected to the N ADO interfaces, and the temperature acquisition circuit is electrically connected to the K NTC interfaces;

[0033] The ADO interface device circuit includes N ADO interface device units, and the ADO interface device units include a signal comparison circuit, a switch control circuit and a signal amplification circuit;

[0034] like Figure 7-Figure 8 As shown, the output end of the signal amplification circuit is electrically connected to a load, and the load includes a heat source unit or a cold source unit, and the heat source unit and the cold source unit are connected to a compressor and a water pump; the heat source unit is used to increase the warehouse temperature when the warehouse temperature is less than or equal to a first critical temperature, and the cold source unit is used to reduce the warehouse temperature when the warehouse temperature is greater than or equal to a second critical temperature.

[0035] When the ambient temperature is less than 15 degrees Celsius and the warehouse temperature is less than or equal to 15 degrees Celsius, the heat source unit is started, the first water supply temperature of the water pump is 45 degrees Celsius, and the first return water temperature of the water pump is 40 degrees Celsius.

[0036] When the ambient temperature is greater than 20 degrees Celsius and the warehouse temperature is greater than or equal to 20 degrees Celsius, the cold source unit is started, the second water supply temperature of the water pump is 7 degrees Celsius, and the second return water temperature of the water pump is 12 degrees Celsius.

[0037] The heat source unit comprises an air blower and a surface cooler. In a heating mode or a cooling mode, the air blower supplies air at full frequency and full load, and the opening percentage of the electric regulating valve of the surface cooler is dynamically adjustable.

[0038] The load also includes a humidifier, an input end of the humidifier is electrically connected to a water replenishment flow switch, and an output end of the humidifier is electrically connected to a humidity alarm; the humidifier opens a water replenishment solenoid valve in a humidification mode, and controls the humidity alarm according to feedback from the water replenishment flow switch.

[0039] When the ambient temperature is less than 15 degrees Celsius and the storage temperature is ≤15 degrees Celsius, the system enters the heating mode; when the ambient temperature is greater than 20 degrees Celsius and the storage temperature is ≥20 degrees Celsius, the system enters the cooling mode.

[0040] When the warehouse temperature is ≤8 degrees Celsius in heating mode, turn on the heat source unit and run the water pump control instruction. The heat source unit autonomously controls and adjusts the operating frequency of the compressor and the water pump, reduces the compressor exhaust volume and the refrigeration circulation water pump flow rate to meet the parameter requirements of 45 degrees Celsius for water supply and 40 degrees Celsius for return water in heating mode.

[0041] When the warehouse temperature is ≥28 degrees Celsius in refrigeration mode, turn on the cold source unit and run the water pump control command. The cold source unit autonomously controls and adjusts the operating frequency of the compressor and water pump, increases the compressor exhaust volume and the refrigeration circulation water pump flow rate to meet the parameter requirements of 7 degrees Celsius for supply water and 12 degrees Celsius for return water in refrigeration mode.

[0042] When the storage temperature is greater than 12 degrees Celsius in heating mode, the heat source unit is turned off, and the compressor and water pump of the heat source unit are operated at a reduced frequency until the compressor and water pump of the heat source unit stop running, and heating is stopped. When the storage temperature is less than 23 degrees Celsius in cooling mode, the cold source unit is turned off, and the compressor and water pump of the cold source unit are operated at a reduced frequency until the compressor and water pump of the cold source unit stop running, and cooling is stopped.

[0043] In heating mode, when the warehouse temperature is ≤8 degrees Celsius, it enters heating mode; the blower supplies air at full frequency and full load, and at the same time detects the supply air temperature signal feedback, and dynamically adjusts the opening percentage of the electric regulating valve of the surface cooler to meet the parameter requirement of the supply air temperature of 15 degrees Celsius.

[0044] In cooling mode, when the storage temperature is ≥28 degrees Celsius, the cooling mode is entered; the blower supplies air at full frequency and full load, and at the same time detects the supply air temperature signal feedback, and dynamically adjusts the opening percentage of the electric regulating valve of the surface cooler to meet the parameter requirement of the supply air temperature of 20 degrees Celsius.

[0045] When the humidity in the warehouse is ≤42% in heating mode or cooling mode, enter the humidification mode. Open the water supply solenoid valve of the wet film humidifier and detect the feedback of the water supply water flow switch. When the water flow switch is reversed, the feedback is that the humidification operation is faulty and the humidity alarm alarms; when the water flow switch is closed, the feedback is that the humidification operation is normal; at the same time, the blower supplies air at full frequency and full load. According to the feedback of the supply air temperature, the opening percentage of the electric regulating valve of the surface cooler is dynamically adjusted to meet the parameter requirements of 15 degrees Celsius for the supply air temperature in the heating mode or 20 degrees Celsius for the supply air temperature in the cooling mode. When adjusting the environmental parameters of the warehouse, the humidification mode has a higher priority than the heating mode and the cooling mode.

[0046] When the humidity in the warehouse is ≥68%RH in heating mode or cooling mode, the dehumidification mode is entered; the reheat condensing dehumidification equipment is turned on, the feedback return air humidity is detected, and the dehumidification compressor operation is autonomously controlled and adjusted; at the same time, the blower supplies air at full frequency and full load, and according to the feedback supply air temperature, the percentage of the opening of the electric regulating valve of the surface cooler is dynamically adjusted to meet the parameter requirements of 15 degrees Celsius for the supply air temperature in heating mode and 20 degrees Celsius for the supply air temperature in cooling mode.

[0047] When the warehouse temperature is greater than 12 degrees Celsius in heating mode, the heating mode is exited, the fan frequency is reduced to 30%, and the surface cooler regulating valve is opened to 100%, and the warehouse is stopped from heating. When the warehouse temperature is less than 23 degrees Celsius in cooling mode, the cooling mode is exited, the fan frequency is reduced to 30%, and the surface cooler regulating valve is opened to 100%, and the warehouse is stopped from cooling.

[0048] When the humidity in the storage is greater than 53%RH in the humidification mode, exit the humidification mode. Close the water supply solenoid valve of the wet film humidifier, detect the feedback of the water supply water flow switch, and when the water flow switch is closed, feedback indicates that the humidification operation has exited the fault, and the humidity alarm alarms. When the water flow switch is disconnected, feedback indicates that the humidification operation has exited normally.

[0049] In dehumidification mode, when the humidity in the warehouse is less than 65%RH, the dehumidification mode is exited. The reheat condensing dehumidification equipment is turned off, and the compressor is autonomously controlled to reduce the frequency until the compressor stops running and waits for the restart instruction.

[0050] The warehouse constant temperature control system of this embodiment also includes a configuration control panel, which has three working modes: shutdown mode, debugging mode and automatic mode. The configuration control panel can switch between the three working modes. When the interface of the configuration control panel displays the shutdown mode, all the equipment controlled by the system exits the running state and stops waiting for work instructions; when the interface of the configuration control panel displays the debugging mode, without setting the prerequisite, the air source heat / cold pump, the hot water unit, the variable frequency fan in the combined air handling unit, the electric regulating valve of the surface cooler in the combined air handling unit, the solenoid valve of the wet film humidifier in the combined air handling unit and the reheat condensing dehumidification equipment can be manually started or paused to meet the requirements of the warehouse temperature of 5-30 degrees Celsius and the humidity of 40-70% RH during the debugging process. The main control logic program is written in the DDC controller, and the configuration control panel is responsible for the human-computer interaction configuration program.

[0051] When the configuration screen interface is set in automatic mode, the automatic control system will independently judge the heating / cooling mode conversion of the cold / heat source equipment in the whole season, the warehouse heating / cooling control and transition adjustment conversion, the humidification / dehumidification operation mechanism in the warehouse, etc. according to the logical conditions in the heat source unit, cold source unit and air handling unit, so as to maintain the warehouse temperature within the range of 5-30 degrees Celsius and the humidity within the range of 40-70% RH throughout the year. The main control logic program is written in the PLC controller.

[0052] The configuration control screen interface information includes ambient temperature, ambient humidity, ambient wind speed, ambient atmospheric pressure, temperature inside the warehouse, humidity inside the warehouse, heat source unit, cold source unit, water pump operating status, wind speed of the air handling unit, supply air temperature, supply air humidity, humidification status, dehumidification status, operation fault alarm information in debugging mode or automatic mode, feedback information and system alarm information.

[0053] The warehouse constant temperature control system of this embodiment also includes a host computer. In addition to the interface function of the configuration control screen, the host computer should also have functions such as historical query, report output, and presentation of operating condition curves. Please refer to the design specification requirements for details.

[0054] The intelligent controller uses an MCU (Microcontroller Unit), which may be an STM series MCU or an STC series MCU, and is not limited here.

[0055] The ADI interface device circuit in the peripheral circuit can collect digital signals or analog signals. If an analog signal is collected, the analog signal is a direct current signal with a voltage between 0-10V and a current between 4-20mA.

[0056] The output of the ADO interface of the intelligent controller is a direct current voltage of 0-10V, and N ADO interfaces are connected to the ADO interface device circuit.

[0057] The intelligent controller also includes a BUS / AB interface, which communicates serially with RS485 communication equipment through RS485 circuits. Using RS485 circuits for remote communication can upload real-time control data or control downstream RS485 equipment.

[0058] The intelligent controller also includes a NET / AB interface, which communicates serially with Bacnet communication devices through Bacnet circuits. Using Bacnet circuits for remote communication can upload real-time control data or control downstream Bacnet devices.

[0059] The signal comparison circuit of the ADO interface device unit receives the corresponding PWM signal. For example, the signal comparison circuit of the second ADO interface device unit receives the PWM2 signal. The signal comparison circuit compares the corresponding PWM signal with the signal threshold to obtain a signal comparison output value. The signal comparison output value is output to the switch control circuit. The switch control circuit outputs a control signal to the signal amplification circuit according to the size of the signal comparison output value to control the conduction or shutdown of the signal amplification circuit.

[0060] The temperature acquisition circuit includes K temperature acquisition units, the K temperature acquisition units are electrically connected to corresponding NTC interfaces, and the K temperature acquisition units can acquire the temperatures of K different positions in the room.

[0061] A warehouse constant temperature control system provided in this embodiment includes an intelligent controller and a peripheral circuit, wherein the intelligent controller includes M ADI interfaces and K NTC interfaces; the peripheral circuit includes an ADI interface device circuit, an ADO interface device circuit and a temperature acquisition circuit, wherein the ADI interface device circuit is electrically connected to the M ADI interfaces, the ADO interface device circuit is electrically connected to the N ADO interfaces, and the temperature acquisition circuit is electrically connected to the K NTC interfaces; the ADO interface device circuit includes N ADO interface device units, and the ADO interface device unit includes a signal comparison circuit, a switch control circuit and a signal amplification circuit; the above-mentioned warehouse constant temperature control system has more ADI interfaces and ADO interfaces, and has the advantage of being able to centrally control more loads, and the intelligent controller collects indoor parameters of different attributes according to the M ADI interfaces. The output end of the signal amplification circuit is electrically connected to the load, and the load includes a heat source unit or a cold source unit, and the heat source unit and the cold source unit are connected to a compressor and a water pump; the heat source unit is used to increase the warehouse temperature when the warehouse temperature is less than or equal to the first critical temperature, and the cold source unit is used to reduce the warehouse temperature when the warehouse temperature is greater than or equal to the second critical temperature. When the temperature is high in summer, the temperature of the warehouse is lowered; when the temperature is low in winter, the temperature of the warehouse is raised, so that the warehouse temperature is within a constant range.

[0062] Example 2

[0063] This embodiment provides a warehouse constant temperature control system, including an intelligent controller and a peripheral circuit, wherein the intelligent controller includes M ADI interfaces and K NTC interfaces;

[0064] The peripheral circuit includes an ADI interface device circuit, an ADO interface device circuit and a temperature acquisition circuit, wherein the ADI interface device circuit is electrically connected to the M ADI interfaces, the ADO interface device circuit is electrically connected to the N ADO interfaces, and the temperature acquisition circuit is electrically connected to the K NTC interfaces;

[0065] The ADO interface device circuit includes N ADO interface device units, and the ADO interface device units include a signal comparison circuit, a switch control circuit and a signal amplification circuit; wherein M≥12, N≥6, and K≥6.

[0066] The input end of the signal comparison circuit is electrically connected to the PWM signal port, the output end of the signal comparison circuit is electrically connected to the input end of the switch control circuit, and the output end of the switch control circuit is electrically connected to the input end of the signal amplification circuit.

[0067] The signal comparison circuit includes a Schmitt trigger, and the switch control circuit includes an operational amplifier, a first switch control resistor and a second switch control resistor; the input end of the Schmitt trigger is electrically connected to the PWM signal port, and the output end of the Schmitt trigger is electrically connected to the non-inverting input end of the operational amplifier through the first switch control resistor and the second switch control resistor.

[0068] Figure 3 An input end of the second Schmitt trigger Uo5A is electrically connected to the second PWM signal PWM2, and an input end of the second Schmitt trigger Uo5A is electrically connected to the second power supply VCC through the first signal comparison resistor Ro10.

[0069] The output end of the second Schmitt trigger Uo5A is electrically connected to the non-inverting input end of the operational amplifier Uo1B through the first switch control resistor Ro11 and the second switch control resistor Ro12. The output end of the operational amplifier Uo1B is electrically connected to the base of the transistor Qo1, the collector of the transistor Qo1 is electrically connected to the first power supply, the supply voltage of the first power supply is 24V, and the emitter of the transistor is electrically connected to the ADO1 interface through the first signal amplification resistor Ro15.

[0070] The Schmitt trigger is a bistable multivibrator with a positive threshold voltage and a negative threshold voltage. When the voltage of the PWM signal received by the Schmitt trigger is greater than the positive threshold voltage, the Schmitt trigger outputs a high level; when the voltage of the PWM signal received by the Schmitt trigger is less than the negative voltage threshold, the Schmitt trigger outputs a low level; when the voltage of the PWM signal received by the Schmitt trigger is greater than or equal to the negative voltage threshold and less than or equal to the positive voltage threshold, the output of the Schmitt trigger remains unchanged.

[0071] When the second Schmitt trigger Uo5A outputs a high level, the non-inverting input terminal of the operational amplifier Uo1B receives a high level, and the output terminal of the operational amplifier Uo1B outputs a high level to the base of the transistor Qo1, and the transistor Qo1 is turned on to provide the first power supply to the ADO1 interface.

[0072] The signal comparison circuit of this embodiment includes a Schmitt trigger, and the switch control circuit includes an operational amplifier, a first switch control resistor, and a second switch control resistor. The input end of the Schmitt trigger is electrically connected to the PWM signal port, and the output end of the Schmitt trigger is electrically connected to the non-inverting input end of the operational amplifier through the first switch control resistor and the second switch control resistor. When the second Schmitt trigger Uo5A outputs a high level, the non-inverting input end of the operational amplifier Uo1B receives a high level, and the output end of the operational amplifier Uo1B outputs a high level to the base of the transistor Qo1, and the transistor Qo1 is turned on to provide the first power supply to the ADO1 interface.

[0073] Example 3

[0074] This embodiment provides a warehouse constant temperature control system, including an intelligent controller and a peripheral circuit, wherein the intelligent controller includes M ADI interfaces and K NTC interfaces;

[0075] The peripheral circuit includes an ADI interface device circuit, an ADO interface device circuit and a temperature acquisition circuit, wherein the ADI interface device circuit is electrically connected to the M ADI interfaces, the ADO interface device circuit is electrically connected to the N ADO interfaces, and the temperature acquisition circuit is electrically connected to the K NTC interfaces;

[0076] The ADO interface device circuit includes N ADO interface device units, and the ADO interface device units include a signal comparison circuit, a switch control circuit and a signal amplification circuit, wherein M≥12, N≥6, and K≥6.

[0077] The ADI interface device circuit includes M ADI interface device units, and the M ADI interface device units are independent of each other and have the same circuit structure.

[0078] like Figure 4 As shown, the ADI interface device unit includes a first resistor Ri11, a second resistor Ri12, a third resistor Ri13 and a fourth resistor Ri14, the second resistor Ri12, the third resistor Ri13 and the fourth resistor Ri14 are connected in series, the first end of the first resistor Ri11 and the first end of the second resistor Ri12 are electrically connected to the ADI1 interface; the first end of the fourth resistor Ri14 is electrically connected to the pAI1 interface, and the second end of the fourth resistor Ri14 is grounded.

[0079] The ADI interface device unit also includes a first capacitor Ci12, a first end of the fourth resistor Ri14 is electrically connected to a second end of the third resistor Ri13, a second end of the third resistor Ri13 is electrically connected to a positive electrode of the first capacitor Ci12, and a negative electrode of the first capacitor Ci12 is grounded.

[0080] A first end of the second resistor Ri12 is electrically connected to the ADI1 interface of the intelligent controller, and a first end of the fourth resistor Ri14 is electrically connected to the pAI1 interface of the AI ​​device or the DI device.

[0081] The ADI interface device unit is a photoelectric isolation circuit, through which the device signal of the corresponding AI device or DI device can be collected, and the device signal is a digital signal or an analog signal. In this embodiment, the ADI interface device circuit includes 12 ADI interface device units, which can collect device signals of 12 devices at the same time.

[0082] The ADI interface device circuit of this embodiment includes M ADI interface device units, which are independent of each other and have the same circuit structure. M ADI interface device units are provided to simultaneously collect device signals of M devices, thereby improving the detection capability of the warehouse constant temperature control system for the indoor environment.

[0083] Example 4

[0084] This embodiment provides a warehouse constant temperature control system, including an intelligent controller and a peripheral circuit, wherein the intelligent controller includes M ADI interfaces and K NTC interfaces;

[0085] The peripheral circuit includes an ADI interface device circuit, an ADO interface device circuit and a temperature acquisition circuit, wherein the ADI interface device circuit is electrically connected to the M ADI interfaces, the ADO interface device circuit is electrically connected to the N ADO interfaces, and the temperature acquisition circuit is electrically connected to the K NTC interfaces;

[0086] The ADO interface device circuit includes N ADO interface device units, and the ADO interface device units include a signal comparison circuit, a switch control circuit and a signal amplification circuit, wherein M≥12, N≥6, and K≥6.

[0087] like Figure 6 As shown, the peripheral circuit also includes a communication circuit, which includes a communication chip Us, and the communication chip includes a first communication interface CANL / 485A, a second communication interface CANH / 485B, a TXD terminal and a RXD terminal, the first communication interface CANL / 485A is electrically connected to the NA terminal, and the second communication interface CANH / 485B is electrically connected to the NB terminal; the TXD terminal is electrically connected to the TX1 interface of the intelligent controller, and the RXD terminal is electrically connected to the RX1 interface of the intelligent controller.

[0088] The BUS / AB interface of the intelligent controller communicates serially with the RS485 communication device through the RS485 circuit, and can upload control data or control the downstream RS485 device. The NET / AB interface of the intelligent controller communicates serially with the Bacnet communication device through the Bacnet circuit, and can upload control data or control the downstream Bacnet device.

[0089] like Figure 5As shown, the temperature acquisition circuit includes K temperature acquisition units, and the temperature acquisition unit includes a first thermistor Rn11 and a second thermistor Rn12. The first end of the first thermistor Rn11 is electrically connected to the first end of the second thermistor Rn12, and the second end of the first thermistor Rn11 is electrically connected to the second power supply VCC; the first end of the second thermistor Rn12 is electrically connected to the NTC1 interface, and the second end of the second thermistor Rn12 is electrically connected to the pNTC1 interface; the first end of the first thermistor Rn11 is electrically connected to the positive electrode of the first temperature test capacitor Cn1, and the negative electrode of the first temperature test capacitor Cn1 is grounded.

[0090] In this embodiment, an intelligent controller has 6 NTC interfaces, namely NTC1 interface, NTC2 interface, NTC3 interface, NTC4 interface, NTC5 interface and NTC6 interface. The temperature acquisition unit is a photoelectric isolation circuit, and the second end of the second thermistor Rn12 is electrically connected to the pNTC1 interface of the power device of the device to be detected. When the device to be detected is working, the temperature of the power device is high, which causes the temperature of the second thermistor Rn12 to rise. The resistance of the second thermistor Rn12 is inversely proportional to the temperature, and the voltage of the NTC1 interface of the intelligent controller will also change. The intelligent controller converts the voltage of the NTC1 interface into a temperature value, and determines whether the temperature of the corresponding device to be detected is too high according to the size of the temperature value. If so, the cooling device is started to reduce the temperature of the corresponding device to be detected.

[0091] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a restriction. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in the subsequent accompanying drawings.

[0092] It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would then be positioned "below" or "below" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly.

[0093] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0094] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A warehouse constant temperature control system, characterized in that: It includes an intelligent controller and peripheral circuits, wherein the intelligent controller includes M ADI interfaces and K NTC interfaces; The peripheral circuit includes an ADI interface device circuit, an ADO interface device circuit and a temperature acquisition circuit, wherein the ADI interface device circuit is electrically connected to the M ADI interfaces, the ADO interface device circuit is electrically connected to the N ADO interfaces, and the temperature acquisition circuit is electrically connected to the K NTC interfaces; The ADO interface device circuit includes N ADO interface device units, and the ADO interface device units include a signal comparison circuit, a switch control circuit and a signal amplification circuit; The output end of the signal amplifying circuit is electrically connected to a load, and the load includes a heat source unit or a cold source unit, and the heat source unit and the cold source unit are connected to a compressor and a water pump; the heat source unit is used to increase the warehouse temperature when the warehouse temperature is less than or equal to a first critical temperature, and the cold source unit is used to reduce the warehouse temperature when the warehouse temperature is greater than or equal to a second critical temperature; The input end of the signal comparison circuit is electrically connected to the PWM signal port, the output end of the signal comparison circuit is electrically connected to the input end of the switch control circuit, and the output end of the switch control circuit is electrically connected to the input end of the signal amplification circuit; The heat source unit includes a blower and a surface cooler. In the heating mode or the cooling mode, the blower blows air at full frequency and full load, and the opening percentage of the electric regulating valve of the surface cooler is dynamically adjustable. The load also includes a humidifier, an input end of the humidifier is electrically connected to a water replenishment flow switch, and an output end of the humidifier is electrically connected to a humidity alarm; the humidifier opens a water replenishment solenoid valve in a humidification mode, and controls the humidity alarm according to feedback from the water replenishment flow switch.

2. The warehouse constant temperature control system according to claim 1, characterized in that: The signal comparison circuit includes a Schmitt trigger, and the switch control circuit includes an operational amplifier, a first switch control resistor and a second switch control resistor; the input end of the Schmitt trigger is electrically connected to the PWM signal port, and the output end of the Schmitt trigger is electrically connected to the non-inverting input end of the operational amplifier through the first switch control resistor and the second switch control resistor.

3. The warehouse constant temperature control system according to claim 2, characterized in that: The signal amplification circuit includes a transistor and a first signal amplification resistor, the base of the transistor is electrically connected to the output end of the operational amplifier; the collector of the transistor is electrically connected to a first power supply, the emitter of the transistor is electrically connected to the first end of the first signal amplification resistor, and the second end of the first signal amplification resistor is electrically connected to the ADO interface.

4. The warehouse constant temperature control system according to claim 1, characterized in that: The ADI interface device circuit includes M ADI interface device units, and the M ADI interface device units are independent of each other and have the same circuit structure.

5. The warehouse constant temperature control system according to claim 4, characterized in that: The ADI interface device unit includes a first resistor, a second resistor, a third resistor and a fourth resistor, the second resistor, the third resistor and the fourth resistor are connected in series, the first end of the first resistor and the first end of the second resistor are electrically connected to the ADI1 interface; the first end of the fourth resistor is electrically connected to the pAI1 interface, and the second end of the fourth resistor is grounded.

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