Closed-loop refrigerant system anti-cross-flow and leakage control system for multiple units operating in parallel

Abstract

This invention discloses a control system and method for preventing cross-contamination and leakage in a closed-loop refrigerant system with multiple units operating in parallel. The system includes a controller, a pressure boosting and depressurization system, and a liquid storage tank system. The liquid storage tank system is bidirectionally connected to each refrigerant unit in the refrigerant system through the pressure boosting and depressurization system. The controller controls the connection and disconnection between the three systems. In the method of this invention, the controller acquires water pressure data within the refrigerant units and controls the pressure boosting and depressurization process based on the water pressure data. 1. This invention can solve the technical difficulties of cross-contamination and leakage in a closed-loop refrigerant system with multiple units operating in parallel, has a wide range of applications, and can be widely used in closed-loop refrigerant systems.

Description

Technical Field

[0001] This invention relates to the field of refrigerant system control, specifically a closed-loop refrigerant system control system for preventing cross-contamination and leakage when multiple units are operating in parallel. Background Technology

[0002] When multiple units of a closed-loop refrigerant system are connected in parallel, the supply ports and return ports of each unit are connected in parallel. During system operation, due to differences in the internal piping of each unit, the internal pressure cannot be kept consistent. Some units will inevitably trigger the depressurization process first. If the depressurization continues, it will eventually cause the internal liquid storage tank to fill up and overflow, resulting in system leakage. Summary of the Invention

[0003] This invention provides a control system for preventing cross-contamination and leakage in a closed-loop refrigerant system when multiple units are operating in parallel, in order to solve the problem of leakage in existing closed-loop refrigerant systems when multiple units are operating in parallel.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A closed-loop refrigerant system for preventing cross-contamination and leakage when multiple units are operating in parallel includes a controller, a pressure boosting and depressurization system, and a refrigerant tank system. The refrigerant tank system stores coolant and is bidirectionally connected to each refrigerant unit in the refrigerant system through the pressure boosting and depressurization system. The controller controls the connection and disconnection between the refrigerant tank system and the pressure boosting and depressurization system, as well as between the pressure boosting and depressurization system and the refrigerant system.

[0006] Furthermore, it also includes a level gauge installed in the liquid storage tank system. The level gauge collects liquid level data in the liquid storage tank system. The level gauge is electrically connected to the controller, and the level gauge transmits the collected liquid level data to the controller.

[0007] Furthermore, it also includes a pressure sensor installed in the coolant system. The pressure sensor collects the water pressure of the coolant system and is electrically connected to the controller. The pressure sensor transmits the collected water pressure data to the controller.

[0008] Furthermore, the liquid supply port of the liquid storage tank system is connected to the liquid inlet of the pressure boosting and depressurization system via a pipeline, and the liquid return port of the liquid storage tank system is connected to the liquid outlet of the pressure boosting and depressurization system via a pipeline. The pressure boosting and depressurization system also has a liquid inlet connected to the liquid supply port of each chiller unit in the chilled liquid system via a pipeline, and the pressure boosting and depressurization system also has a liquid outlet connected to the liquid return port of each chiller unit in the chilled liquid system via a pipeline, thus forming a bidirectional connection. Each pipeline is equipped with a solenoid valve, and the controller is electrically connected to each solenoid valve. The controller controls the connection and disconnection between the liquid storage tank system and the pressure boosting and depressurization system, as well as between the pressure boosting and depressurization system and the chilled liquid system, through the solenoid valves.

[0009] A control method for a closed-loop refrigerant system with multiple units operating in parallel to prevent cross-contamination and leakage is provided. The process is as follows: the controller acquires the water pressure of the refrigerant system and compares the water pressure with a preset pressure relief trigger value. When the water pressure of the refrigerant system is higher than the pressure relief trigger value, the controller controls the pressure boosting and depressurization system to release the coolant in the refrigerant system into the storage tank system. The controller also acquires the real-time water pressure of the refrigerant system and compares it with a preset pressure relief stop value. When the real-time water pressure is lower than the preset pressure relief stop value, the controller controls the pressure boosting and depressurization system to stop depressurizing.

[0010] When the coolant system water pressure is lower than the preset pressure boosting trigger value, the controller controls the pressure boosting and depressurization system to input coolant from the storage tank system into the coolant system. The controller also collects the real-time water pressure of the coolant system and compares it with the preset pressure boosting stop value. When the real-time water pressure is higher than the preset pressure boosting stop value, the controller controls the pressure boosting and depressurization system to stop the pressure boosting operation.

[0011] Furthermore, the controller acquires the liquid level data of the liquid storage tank system. When the liquid level of the liquid storage tank system is higher than the preset high liquid level alarm value, the controller controls the pressure boosting and depressurization system to stop depressurizing. At the same time, the controller increases the depressurization trigger value by a certain value to become a new depressurization trigger value, and re-determines whether the water pressure of the coolant system is higher than the new depressurization trigger value. If it is higher than the new trigger value, the controller controls the pressure boosting and depressurization system to depressurize until the water pressure of the coolant system is lower than the new depressurization trigger value, at which point the controller controls the pressure boosting and depressurization system to stop depressurizing.

[0012] When the liquid level in the storage tank system is higher than the high liquid level alarm value, the controller increases the pressure boosting trigger value by a certain amount to become the new pressure boosting trigger value, and increases the pressure boosting stop value by a certain amount to become the new pressure boosting stop value. The control system judges according to the new pressure boosting trigger value and pressure boosting stop value, and controls the pressure boosting and depressurization system to perform pressure boosting.

[0013] This invention prevents cross-contamination and leakage in closed-loop refrigerant systems with multiple units operating in parallel, effectively increasing system reliability. The pressure boosting and depressurization system can utilize a water pump, enabling refrigerant replenishment and drainage, reducing product costs and further enhancing system reliability.

[0014] The beneficial effects of this invention are:

[0015] 1. This invention can solve the technical difficulties of liquid leakage when multiple units in a closed-loop refrigerant system are connected in parallel;

[0016] 2. This invention has a simple structure, is easy to manufacture, and is safe and reliable;

[0017] 3. This invention has a wide range of applications and can be widely used in closed-loop refrigerant systems. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the existing coolant system.

[0019] Figure 2 This is a schematic diagram of the structure of an embodiment of the present invention. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments. Example

[0021] like Figure 2 As shown in the figure, this embodiment discloses a closed-loop refrigerant system for preventing cross-contamination and leakage when multiple units are operating in parallel, including a controller, a reservoir system, and a pressure boosting and depressurization system. The control system is connected to the reservoir system, the pressure boosting and depressurization system, and the refrigerant system via cable lines, collecting relevant information and sending relevant operating commands; the reservoir system is connected to the pressure boosting and depressurization system via water pipes; the pressure boosting and depressurization system is connected to the refrigerant system via water pipes.

[0022] Specifically, the liquid supply port of the liquid storage tank system is connected to the liquid inlet of the pressure boosting and depressurization system via a pipeline, and the liquid return port of the liquid storage tank system is connected to the liquid outlet of the pressure boosting and depressurization system via a pipeline. The pressure boosting and depressurization system also has a liquid inlet connected to the liquid supply port of each chiller unit in the chilled liquid system via a pipeline, and the pressure boosting and depressurization system also has a liquid outlet connected to the liquid return port of each chiller unit in the chilled liquid system via a pipeline, thus forming a bidirectional connection. Each pipeline is equipped with a solenoid valve, and the controller is electrically connected to each solenoid valve. The controller controls the connection and disconnection between the liquid storage tank system and the pressure boosting and depressurization system, as well as between the pressure boosting and depressurization system and the chilled liquid system, through the solenoid valves.

[0023] The liquid storage tank system is equipped with a level gauge, which is electrically connected to the controller. The level gauge collects the liquid level data within the liquid storage tank system and transmits it to the controller. The cold liquid system is equipped with a pressure sensor, which is also electrically connected to the controller. The pressure sensor collects the water pressure of the cold liquid system and transmits it to the controller.

[0024] The coolant reservoir system stores a certain amount of coolant for pressurizing the cold liquid system, and its internal space is used to store coolant when the cold liquid system is depressurized. During pressurization, the pressurization / depressurization system introduces coolant from the reservoir system into the cold liquid system, increasing the pressure within the system; during depressurization, it releases coolant from the cold liquid system back into the reservoir system, reducing the pressure. Example

[0025] This embodiment discloses a control method for the control system described in Embodiment 1, the process of which is as follows:

[0026] (1) When the pressure in the coolant system is higher than the pressure relief trigger value, the controller controls the pressure relief system to perform pressure relief work, releasing the coolant in the coolant system into the storage tank system until the pressure in the coolant system is lower than the pressure relief stop value, and then controls the pressure relief system to stop the pressure relief work.

[0027] (2) After the pressure in the coolant system is lower than the pressure boosting trigger value, the controller controls the pressure boosting and depressurization system to boost the coolant in the storage tank system into the coolant system until the pressure in the coolant system is higher than the pressure boosting stop value, and then controls the pressure boosting and depressurization system to stop boosting.

[0028] (3) When the liquid level in the storage tank system is higher than the high liquid level alarm value, the controller controls the pressure relief system to stop the pressure relief operation. At the same time, the pressure relief trigger value is increased by a certain value (such as 0.07 MPa) to become the new pressure relief trigger value. The controller then re-evaluates whether the pressure of the coolant system is higher than the new pressure relief trigger value. If it is higher than the new trigger value, the pressure relief operation is started until the pressure is lower than the new pressure relief trigger value, at which point the controller controls the pressure relief system to stop the pressure relief operation. When the pressure in the entire parallel system increases, the pressure relief trigger value of the coolant system whose liquid level in the storage tank system has exceeded the high liquid level alarm value will be higher than that of other units. In this way, other coolant units will reach the pressure relief trigger value first and then relieve pressure, thus avoiding further pressure relief by the units that have already reported the high liquid level alarm in the storage tank, which could lead to liquid overflow and leakage.

[0029] (4) When the liquid level in the storage tank system is higher than the high liquid level alarm value, the controller increases the pressure boosting trigger value by a certain amount (e.g., 0.03 MPa) to become the new pressure boosting trigger value, and increases the pressure boosting stop value by a certain amount (e.g., 0.02 MPa) to become the new pressure boosting stop value. The controller judges according to the new pressure boosting trigger value and pressure boosting stop value, and controls the pressure boosting and depressurization system to perform pressure boosting. When the pressure in the entire parallel system decreases, the constant pressure trigger value of the coolant system whose liquid level in the storage tank system has exceeded the high liquid level alarm value will be higher than that of other units. In this way, it will reach the constant pressure trigger value first and perform constant pressure compared to other coolant units. It will prioritize inputting the coolant in the storage tank system of the unit that has reported the high liquid level alarm into the parallel system, further balancing the liquid level in the storage tanks of each unit.

[0030] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. These embodiments are merely descriptions of preferred embodiments and are not intended to limit the scope or concept of the invention. The specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. Such combinations, as long as they do not violate the spirit of the present invention, should also be considered as part of this disclosure. To avoid unnecessary repetition, the present invention will not further describe the various possible combinations.

[0031] This invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this invention and without departing from the design idea of ​​this invention, all modifications and improvements made by those skilled in the art to the technical solutions of this invention should fall within the protection scope of this invention. The technical content for which protection is sought in this invention has been fully described in the claims.

Claims

1. A control method for a closed-loop refrigerant system with multiple units operating in parallel to prevent cross-contamination and leakage, characterized in that, The closed-loop refrigerant system anti-cross-flow and leakage control system for multiple units operating in parallel includes a controller, a pressure boosting and depressurization system, and a liquid storage tank system. The liquid storage tank system stores coolant and is bidirectionally connected to each refrigerant unit in the refrigerant system through the pressure boosting and depressurization system. The controller controls the connection and disconnection between the liquid storage tank system and the pressure boosting and depressurization system, as well as between the pressure boosting and depressurization system and the refrigerant system. The control method of the closed-loop refrigerant system anti-cross-flow and leakage control system when multiple units are connected in parallel is as follows: The controller acquires the water pressure of the refrigerant system and compares the water pressure with a preset pressure relief trigger value. When the water pressure of the refrigerant system is higher than the pressure relief trigger value, the controller controls the pressure boosting and depressurization system to release the coolant in the refrigerant system into the storage tank system. The controller also collects the real-time water pressure of the refrigerant system and compares it with a preset pressure relief stop value. When the real-time water pressure is lower than the preset pressure relief stop value, the controller controls the pressure boosting and depressurization system to stop depressurizing. When the coolant system water pressure is lower than the preset pressure boosting trigger value, the controller controls the pressure boosting and depressurization system to input the coolant from the storage tank system into the coolant system, and collects the real-time water pressure of the coolant system and compares it with the preset pressure boosting stop value. When the real-time water pressure is higher than the preset pressure boosting stop value, the controller controls the pressure boosting and depressurization system to stop the pressure boosting operation. The controller acquires the liquid level data of the storage tank system. When the liquid level in the storage tank system is higher than the preset high liquid level alarm value, the controller controls the pressure boosting and depressurization system to stop depressurizing. At the same time, the controller increases the depressurization trigger value by a certain amount to become a new depressurization trigger value, and re-determines whether the coolant system water pressure is higher than the new depressurization trigger value. If it is higher than the new trigger value, the controller controls the pressure boosting and depressurization system to depressurize until the coolant system water pressure is lower than the new depressurization trigger value, at which point the controller controls the pressure boosting and depressurization system to stop depressurizing. When the liquid level in the storage tank system is higher than the high liquid level alarm value, the controller increases the pressure boosting trigger value by a certain amount to become a new pressure boosting trigger value, and increases the pressure boosting stop value by a certain amount to become a new pressure boosting stop value. The control system judges according to the new pressure boosting trigger value and pressure boosting stop value, and controls the pressure boosting and depressurization system to increase pressure.

2. The control method for the anti-leakage control system of a closed-loop refrigerant system with multiple units operating in parallel according to claim 1, characterized in that, It also includes a level gauge installed in the liquid storage tank system. The level gauge collects liquid level data in the liquid storage tank system. The level gauge is electrically connected to the controller and transmits the collected liquid level data to the controller.

3. The control method for the anti-leakage control system of a closed-loop refrigerant system with multiple units operating in parallel according to claim 1, characterized in that, It also includes a pressure sensor installed in the coolant system. The pressure sensor collects the water pressure of the coolant system and is electrically connected to the controller. The pressure sensor transmits the collected water pressure data to the controller.

4. The control method for the anti-leakage control system of a closed-loop refrigerant system with multiple units operating in parallel according to claim 1, characterized in that, The liquid supply port of the liquid storage tank system is connected to the liquid inlet of the pressure boosting and depressurization system via a pipeline, and the liquid return port of the liquid storage tank system is connected to the liquid outlet of the pressure boosting and depressurization system via a pipeline. The pressure boosting and depressurization system also has a liquid inlet connected to the liquid supply port of each chiller unit in the chilled liquid system via a pipeline, and the pressure boosting and depressurization system also has a liquid outlet connected to the liquid return port of each chiller unit in the chilled liquid system via a pipeline, thus forming a bidirectional connection. Each pipeline is equipped with a solenoid valve, and the controller is electrically connected to each solenoid valve. The controller controls the connection and disconnection between the liquid storage tank system and the pressure boosting and depressurization system, as well as between the pressure boosting and depressurization system and the chilled liquid system, through the solenoid valves.

Images