Central air conditioner with pressure abnormity intelligent protection function

Abstract

The utility model provides a central air conditioner with pressure abnormity intelligent protection, which comprises a cold water system and a cooling water system, the cold water system comprises an evaporator, a water pump, a water segregator, a user side and a water collector which are sequentially connected in series, and the evaporator is further communicated with a compressor of a refrigeration host. The water collector is used for collecting chilled water flowing back from all the user side branches, the water distributor is used for distributing the chilled water to all the user side branches, and pressure sensors are arranged at a water inlet of the water distributor, an outlet of the water collector, a plurality of water inlets of the water collector and an inlet and outlet of the refrigeration host. The pressure sensor is connected with an intelligent controller, and the intelligent controller is used for controlling the cold water system to start and stop according to feedback data of the pressure sensor. The defect that in the prior art, system equipment is damaged or even shut down is caused by abnormal pipeline pressure can be overcome.

Description

TECHNICAL FIELD

[0001] The utility model relates to central air conditioning system's safety control technical field, specifically related to a kind of central air conditioner with pressure abnormality intelligent protection. BACKGROUND

[0002] In the daily operation of central air conditioning system, the stability of main pipeline pressure is the basis for normal operation of the system. When the main pipeline pressure exceeds the normal range (such as higher than 0.95Mpa or lower than 0.3Mpa), it may cause irreversible damage to the equipment in the system, such as magnetic suspension centrifuge, high-pressure centrifuge, water supply pump, refrigeration pump and cooling pump, and even cause system shutdown.

[0003] Although certain protective measures have been taken in the design and operation of current central air conditioning systems to deal with the problem of abnormal main pipeline pressure, the existing technology still has the following significant defects:

[0004] (1) Slow response

[0005] The protection logic of some systems is not reasonable enough, and the response time from detecting pressure abnormalities to executing protection measures is relatively long, which cannot quickly cut off the fault source and prevent the situation from further expanding.

[0006] (2) Limited protection range

[0007] The protection logic of some existing systems only targets single devices such as main machines or water supply pumps, ignoring the protection needs of other key devices such as refrigeration system water pumps when the pressure is abnormal, resulting in poor overall protection effect of the system.

[0008] (3) Low degree of intelligence

[0009] Traditional protection measures often rely on manual judgment and manual operation, and cannot achieve automatic and intelligent control. This not only increases labor costs, but also reduces the reliability and stability of the system.

[0010] (4) Weak self-diagnosis and processing capability

[0011] Existing systems can only perform simple stop operations when the pressure is abnormal, and lack self-diagnosis and processing capabilities. This leads to the need for professional personnel to conduct on-site troubleshooting and maintenance after a fault occurs, increasing maintenance costs and time costs.

[0012] (5) Lack of early warning mechanism

[0013] Some systems lack an early warning mechanism and cannot issue early warning signals when the pressure approaches the abnormal threshold, so that operators can take measures to avoid faults.

[0014] (6) Low system integration

[0015] Central air conditioning systems of different brands and models differ in their protection logic and control methods, making system integration and unified management difficult. This increases the complexity and difficulty of system maintenance. Utility Model Content

[0016] Therefore, this utility model provides a central air conditioner with intelligent protection against abnormal pressure, which can overcome the above-mentioned defects in the prior art.

[0017] To address the aforementioned issues, this utility model provides a central air conditioning system with intelligent protection against pressure anomalies, comprising a chilled water system and a cooling water system. The chilled water system includes an evaporator, a water pump, a water distributor, user terminals, and a water collector connected in series. The evaporator is also connected to the compressor of the refrigeration unit. The water collector is used to collect chilled water returning from each user terminal branch. The water distributor is used to distribute chilled water to each user terminal branch. Pressure sensors are installed at the inlet of the water distributor, the outlet of the water collector, several inlets of the water collector, and the inlet and outlet of the refrigeration unit. The pressure sensors are connected to an intelligent controller, which controls the start and stop of the chilled water system based on the feedback data from the pressure sensors.

[0018] In some embodiments, the refrigeration unit includes a magnetic levitation centrifuge and a high-pressure centrifuge.

[0019] In some embodiments, the outlet of the water collector is also connected to a water supply pump, the water supply pump is connected to an external water source, and the intelligent controller is communicatively connected to the refrigeration unit, the water pump and the water supply pump to control their start and stop.

[0020] In some embodiments, the water pump and the water replenishment pump are further connected to a motor and a reducer for driving the water pump and the water replenishment pump to operate.

[0021] In some embodiments, an electric gate is also provided at several water inlets of the water collector. The electric gate is used to control the flow rate of several water inlet pipes of the water collector. A position sensor is provided on the electric gate, and the position sensor is signal-connected to the intelligent controller.

[0022] This utility model provides a central air conditioning system with intelligent protection against abnormal pressure. Pressure sensors are installed at the inlet and outlet of the distributor and collector to monitor the distribution and return of chilled water in real time. Pressure data at these locations reflects the hydraulic balance of the system, helping to adjust the flow distribution of each branch and ensure stable system operation. It also allows for timely detection of pipe blockages and leaks. As one of the core components of the central air conditioning system, the pressure changes at the inlet and outlet of the chiller unit directly reflect the unit's operating status and load. Installing pressure sensors at these locations ensures the unit operates efficiently and safely. When abnormal pressure occurs, the unit's operating status can be adjusted promptly, or corresponding measures can be taken to prevent unit damage or system failure. The chilled water circulation pump is responsible for circulating chilled water throughout the system. Pressure changes at its inlet and outlet reflect the pump's operating status and head capacity. By installing pressure sensors at these locations, monitoring the pressure allows for assessment of whether the pump's performance meets system requirements and timely detection of pump malfunctions or performance degradation. Simultaneously, pump operating parameters can be adjusted based on pressure data to optimize system energy efficiency. High-precision pressure sensors ensure accurate real-time monitoring of the main pipeline pressure. Furthermore, once an abnormal pressure is detected, the protection logic is immediately activated to shorten the time before equipment damage occurs. The intelligent controller connects to key equipment such as the refrigeration unit, the water supply pump, and the refrigeration system water pumps to ensure overall system safety. The device has a compact structure, is easy to install, and has clear control logic, facilitating daily maintenance and troubleshooting. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the water circulation structure of a central air conditioning system with intelligent protection against pressure abnormalities, according to an embodiment of this utility model. Detailed Implementation

[0024] See also Figure 1As shown in the figure, according to an embodiment of this utility model, a central air conditioning system with intelligent protection against pressure anomalies is provided, including a chilled water system and a cooling water system. The chilled water system includes an evaporator, a water pump, a distributor, user terminals, and a collector connected in series. The evaporator is also connected to the compressor of the refrigeration unit. The collector is used to collect the chilled water returning from each user terminal branch. The distributor is used to distribute the chilled water to each user terminal branch. Pressure sensors are installed at the inlet of the distributor, the outlet of the collector, several inlets of the collector, and the inlet and outlet of the refrigeration unit. The pressure sensors are connected to an intelligent controller, which controls the start and stop of the chilled water system based on the feedback data from the pressure sensors. Installing pressure sensors at the inlet and outlet of the distributor and collector allows for real-time monitoring of the distribution and return of chilled water. The pressure data at these locations reflects the hydraulic balance of the system, helps adjust the flow distribution of each branch, and ensures stable system operation. It also allows for timely detection of pipe blockages and leaks. As one of the core components of a central air conditioning system, the pressure changes at the inlet and outlet of the refrigeration unit directly reflect its operating status and load. Installing pressure sensors at these locations to monitor the pressure ensures the unit operates efficiently and safely. When abnormal pressure occurs, the unit's operating status can be adjusted promptly, or appropriate measures can be taken to prevent unit damage or system failure. The chilled water circulation pump is responsible for circulating chilled water throughout the system. Pressure changes at its inlet and outlet reflect the pump's operating status and head capacity. Installing pressure sensors at these locations allows for the assessment of whether the pump's performance meets system requirements and timely detection of pump malfunctions or performance degradation. Simultaneously, pump operating parameters can be adjusted based on pressure data to optimize system energy efficiency. High-precision pressure sensors are used to ensure accurate real-time monitoring of the main pipeline pressure.

[0025] Specifically, central air conditioning systems with intelligent pressure anomaly protection also include actuators for controlling the start and stop of the equipment. These actuators include electrical components such as solenoid valves and relays, which are connected to the control circuits of the refrigeration unit, the make-up water pump, and the refrigeration system water pump. The intelligent controller achieves intelligent control of the equipment by controlling the start and stop of the equipment and the on / off state of the actuators. The control circuit uses relays to control the solenoid valves and other actuators, with the relays serving to amplify, isolate, and protect signals. The relays control the on / off state of the solenoid valves, thereby controlling the flow of media (such as water or gas).

[0026] In one specific embodiment, the refrigeration unit includes a magnetic levitation centrifuge and a high-pressure centrifuge.

[0027] In one specific embodiment, the water collector outlet is also connected to a makeup water pump, which is connected to an external water source. The intelligent controller is communicatively connected to the chiller, the water pump, and the makeup water pump to control their start and stop. Once an abnormal pressure is detected, the protection logic is immediately activated to shorten the equipment damage time. The intelligent controller connects to key equipment such as the chiller, the makeup water pump, and the chiller system's water pumps to ensure overall system safety. The device has a compact structure, is easy to install, and has clear control logic, facilitating daily maintenance and troubleshooting.

[0028] In one specific embodiment, the water pump and the makeup water pump are further connected to a motor and a reducer for driving the operation of the water pump and the makeup water pump. The output shaft of the motor is directly connected to the input shaft of the reducer to transmit power. After the reducer reduces the speed through its internal gear structure, it transmits the power to the water pump and the makeup water pump to achieve mechanical movement. The structure is simple and the operation is convenient.

[0029] In one specific embodiment, several inlets of the water collector are further equipped with electric gates. These electric gates control the flow rate of the water inlets. Each electric gate is equipped with a position sensor, which is signal-connected to the intelligent controller. The position sensor monitors the position of the electric gate and converts the position information into an electrical signal, which is then output to the control circuit. The control circuit adjusts the operation of the electric gate's motor based on the position signal and the input control signal.

[0030] Intelligent control system control logic:

[0031] High voltage protection procedure:

[0032] When the pressure sensor detects that the pressure in the main pipeline is continuously higher than 0.95 MPa, the intelligent controller immediately determines that it is a high-pressure abnormal state.

[0033] The controller sends a stop command to the refrigeration unit (i.e., magnetic levitation centrifuge, high-pressure centrifuge, etc.) and simultaneously cuts off the power to the water supply pump, causing it to stop running.

[0034] Entering a 2-minute delay waiting phase, during which the controller continuously monitors the main pipeline pressure.

[0035] A delay waiting phase is implemented to prevent the accumulation of cold air in the evaporator, which could damage the equipment, and to avoid prolonged equipment downtime due to erroneous signal indications. The stability of the input signal is monitored, meaning whether the signal value fluctuates within a reasonable range. Frequent fluctuations or abrupt changes in the signal value may indicate a problem with the sensor or signal transmission line. For example, a momentary change in signal value greater than 30% is considered a false signal. Continuity monitoring is also performed, ensuring the signal remains continuous without interruption. A sudden interruption or disappearance of the signal may indicate a sensor malfunction or connection problem, and the signal is identified as a false signal, maintaining the previous instantaneous value. After the delay, if the pressure returns to normal, the main unit is restarted; if the pressure still does not return to normal, the controller sends a stop command to the refrigeration system pumps (including chilled water pumps and cooling water pumps) to ensure the entire refrigeration system is in a safe shutdown state. If the circulating water pump stops but the main unit does not, the cold energy in the evaporator of the main unit cannot be dissipated, which will cause some of the chilled water in the evaporator to freeze, thereby damaging the internal parts of the equipment; at the same time, the heat in the condenser cannot be dissipated, which may cause the refrigerant to not be completely liquefied when it enters the expansion valve, thereby causing the compressor to surge and damaging the system equipment.

[0036] Low-voltage protection procedure:

[0037] When the pressure sensor detects that the main pipeline pressure is consistently below 0.3 MPa, the intelligent controller determines it to be a low-pressure abnormality.

[0038] Similar to high-voltage protection, the controller first stops the operation of all main units and cuts off the power to the water supply pump.

[0039] It also enters a 2-minute delay waiting phase, and pressure changes are continuously monitored.

[0040] If the pressure does not return to the normal range after the delay period, the operation of the refrigeration system water pump will be stopped.

[0041] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A central air conditioning system with intelligent protection against abnormal pressure, characterized in that, The system includes a chilled water system and a cooling water system. The chilled water system includes an evaporator, a water pump, a water distributor, user terminals, and a water collector connected in series. The evaporator is also connected to the compressor of the refrigeration unit. The water collector is used to collect the chilled water returning from each user terminal branch. The water distributor is used to distribute the chilled water to each user terminal branch. Pressure sensors are installed at the inlet of the water distributor, the outlet of the water collector, several inlets of the water collector, and the inlet and outlet of the refrigeration unit. The pressure sensors are connected to an intelligent controller, which is used to control the start and stop of the chilled water system based on the feedback data from the pressure sensors.

2. The central air conditioning system with intelligent pressure anomaly protection according to claim 1, characterized in that, The refrigeration unit includes a magnetic levitation centrifuge and a high-pressure centrifuge.

3. The central air conditioning system with intelligent pressure anomaly protection according to claim 1, characterized in that, The outlet of the water collector is also connected to a water supply pump, which is connected to an external water source. The intelligent controller is communicatively connected to the refrigeration unit, the water pump, and the water supply pump to control their start and stop.

4. The central air conditioning system with intelligent pressure anomaly protection according to claim 3, characterized in that, The water pump and the water replenishment pump are also connected to a motor and a reducer for driving the water pump and the water replenishment pump.

5. The central air conditioning system with intelligent pressure anomaly protection according to claim 1, characterized in that, The water collector is also equipped with electric gates at several water inlets. The electric gates are used to control the flow rate of the water inlet pipes of the water collector. The electric gates are equipped with position sensors, which are signal-connected to the intelligent controller.

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