Cooling unit

Abstract

The invention relates to a cooling unit which comprises a refrigeration side, a cold carrying side and a first heat exchanger, the refrigeration side exchanges heat with the cold carrying side through the first heat exchanger, the refrigeration side comprises a condenser, a throttling valve and a compressor, the cold carrying side comprises a first branch and a second branch, the first branch is connected with the second branch in parallel, and the second branch is connected with the first heat exchanger. The first heat exchanger is connected with the second heat exchanger; the first branch circuit and the second branch circuit are respectively connected with a terminal, the first branch circuit comprises a first pump, the second branch circuit comprises a second pump, the first branch circuit and the second branch circuit can be communicated under a preset condition, and the operation stability and reliability of the cooling unit are improved through the design of redundant backup of the cold carrying side.

Description

Technical Field

[0001] The present application relates to the field of chillers, and in particular to a cooling unit. Background Art

[0002] In many industrial refrigeration and air-conditioning fields, the reliability and maintainability of refrigeration units are extremely important for the stable and continuous operation of industrial equipment. High-reliability refrigeration units are required. When a refrigeration unit fails, it needs to be shut down for maintenance, and the industrial equipment that requires refrigeration has to temporarily stop working, causing losses. If the refrigeration unit fails when unattended, the industrial equipment may even be damaged and have fire hazards due to untimely heat dissipation. Summary of the invention

[0003] In order to solve the above problems, the first aspect of the present application provides a cooling unit, including a refrigeration side, a cold load side, and a first heat exchanger. The refrigeration side and the cold load side exchange heat through the first heat exchanger. The refrigeration side includes a condenser, a throttle valve, and a compressor. The cold load side includes a first branch and a second branch. The first branch and the second branch are connected in parallel and can be connected to the first heat exchanger respectively; the first branch and the second branch are respectively connected to a terminal, the first branch includes a first pump, the second branch includes a second pump, and the first branch and the second branch can be connected under preset conditions.

[0004] By setting up redundant backup on the cold side, the fault tolerance of the cooling unit operation is improved, the stability and reliability are increased, and the continuous operation of the refrigeration is ensured.

[0005] Optionally, the cooling side also includes a main road, the first branch and the second branch are connected respectively, and the main road is connected to the first heat exchanger; the working fluid flow path on the cooling side includes at least the first branch and / or the second branch, the main road, the first heat exchanger, the main road, the first branch and / or the second branch; setting up the main road can reduce costs and facilitate heat exchange with the first heat exchanger. At the same time, the main road can be connected to the natural cooling circuit to improve fault tolerance.

[0006] Optionally, the cooling side further includes a connecting pipe, which can connect the first branch and the second branch under preset conditions.

[0007] The connecting pipe can connect the first branch with the second branch after one of the first pump of the first branch or the second pump of the second branch is damaged, and the working fluids of the two branches can be driven by the undamaged water pump.

[0008] Optionally, the connecting pipe is connected between the first pump and the terminal, and the other end of the connecting pipe is connected between the second pump and the other terminal.

[0009] The connecting pipe can connect the first branch and the second branch to form a backup.

[0010] Optionally, the main road includes a temperature sensor and / or a pressure sensor for detecting the operating status of the main road; the first branch and / or the second branch include a temperature sensor and / or a pressure sensor for detecting the operating status of the corresponding branch; temperature and pressure sensors are respectively arranged on the main road and the first branch and the second branch to facilitate the discovery of the location where the fault occurs.

[0011] Optionally, the main road also includes a main road temperature sensor and a main road pressure sensor, the main road temperature sensor is used to detect the temperature of the main road, and the main road pressure sensor is used to detect the tension of the main road; the first branch includes a first branch pressure sensor and a first branch temperature sensor, the first branch pressure sensor is used to detect the pressure of the first branch, and the first branch temperature sensor is used to detect the temperature of the first branch, and the second branch includes a second branch pressure sensor and a second branch temperature sensor; the second branch pressure sensor is used to detect the pressure of the second branch, and the second branch temperature sensor is used to detect the temperature of the second branch.

[0012] Setting sensors on multiple components can fully sense the working status of each component and detect faults in time.

[0013] Optionally, the main circuit also includes a spherical filter and a pipe heater to form a flow path of the first branch and / or the second branch, the first heat exchanger, the spherical filter, the pipe heater, the first branch and / or the second branch; the pipe heater is provided to control the temperature of the working fluid circulation on the cooling side to ensure the normal operation of the refrigeration.

[0014] Optionally, the first branch and the second branch are respectively provided with an evaporator, and the evaporator includes at least one group of liquid cooling plates; the liquid cooling plates are used for heat exchange with the terminal; multiple groups of parallel liquid cooling plates are arranged at the terminal for heat exchange, with high fault tolerance and good heat exchange effect.

[0015] Optionally, it also includes a liquid replenishment circuit, which connects the first branch and the second branch. The liquid replenishment circuit includes a liquid storage tank and a liquid replenishment pump, which is used to replenish the working fluid to the cooling side; the liquid replenishment circuit can replenish the working fluid in time to ensure the normal operation of refrigeration.

[0016] Optionally, the refrigeration side includes a first refrigeration circuit and a second refrigeration circuit, the first refrigeration circuit and the second refrigeration circuit each include a condenser and a throttle valve, the first refrigeration circuit and the second refrigeration circuit are respectively connected to the first heat exchanger, the first refrigeration circuit includes a first compressor, and the second refrigeration circuit includes a second compressor; the first refrigeration circuit and / or the second refrigeration circuit include a temperature sensor and / or a pressure sensor for detecting the operating status of the first refrigeration circuit and / or the second refrigeration circuit, and the first refrigeration circuit and / or the second refrigeration circuit include a temperature sensor and / or a pressure sensor; by setting a redundant backup on the cold side, the fault tolerance of the cooling unit operation is improved, the stability and reliability are increased, and the continuous operation of the refrigeration is ensured; temperature sensors and pressure sensors are set at multiple positions on the refrigeration side, and the location of the fault is accurately determined through a variety of data.

[0017] Optionally, the first refrigeration circuit and the second refrigeration circuit respectively include a condenser, and the condenser is provided with a condenser temperature sensor; the first compressor and the second compressor are respectively provided with an intake pressure sensor and an intake temperature sensor, and are also connected to an exhaust temperature sensor and an exhaust pressure sensor; by setting sensors in each component, the location of the fault can be accurately determined from two dimensions of temperature and pressure.

[0018] Optionally, it also includes a natural cooling circuit, which includes a dry cooler and a three-way valve. The natural cooling circuit is connected to the main road, and the flow path of the natural cooling circuit at least includes the main road, the three-way valve, the dry cooler, and the main road.

[0019] Optionally, the condenser is a dual-system condenser, which includes a dry cooler; the dual-system condenser has a smaller volume and is easy to install and maintain.

[0020] Optionally, the first compressor and / or the second compressor is a variable frequency compressor; the first pump and / or the second pump is a variable frequency pump; by changing the frequency of the variable frequency compressor and the variable frequency pump, the refrigeration capacity of the cooling unit can be changed to adapt to the refrigeration needs of the terminal.

[0021] The present invention provides redundant backup on the cold-carrying side, with multiple branches backing up each other, thereby improving the fault tolerance of the cooling unit operation, increasing stability and reliability, and ensuring continuous refrigeration operation.

[0022] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of Example 1 of the present application;

[0024] Figure 2 This is a schematic diagram of Example 6 of the present application;

[0025] Figure 3 This is a schematic diagram of the backup mode of Example 1;

[0026] Figure 4 This is a schematic diagram of the backup mode of Example 6;

[0027] Figure 5 This is a flowchart of the application;

[0028] Figure numerals: 01-fan, 02-condenser, 031-main circuit temperature sensor, 032-first branch circuit temperature sensor, 033-second branch circuit temperature sensor, 034-intake temperature sensor, 035-exhaust temperature sensor, 036-condenser temperature sensor, 041-main circuit pressure sensor, 042-first branch circuit pressure sensor, 043-second branch circuit pressure sensor, 044-intake pressure sensor, 045-exhaust pressure sensor , 05-connecting pipe, 06-pressure switch, 071-first compressor, 072-second compressor, 08-throttle valve, 09-gas-liquid separator, 10-drying filter, 11-liquid reservoir, 12-first pump, 13-second pump, 14-first heat exchanger, 15-check valve, 16-liquid replenishment pump, 17-dry cooler, 18-liquid storage tank, 19-three-way valve, 20-constant pressure tank, 21-pipeline heater, 23-spherical filter, 24-regulating valve.

[0029] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0030] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0031] It should be clear that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0032] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0033] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0034] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0035] Example 1

[0036] The present application embodiment provides a cooling unit, such as Figure 1 , 3As shown, it includes a refrigeration side, a cold-carrying side, and a first heat exchanger 14. The refrigeration side and the cold-carrying side perform heat exchange through the first heat exchanger 14. The refrigeration side includes a first refrigeration circuit and a second refrigeration circuit. The first refrigeration circuit and the second refrigeration circuit respectively include a condenser 02 and a throttle valve 08. The first refrigeration circuit and the second refrigeration circuit are respectively connected to the first heat exchanger 14. The first refrigeration circuit includes a first compressor 071, and the second refrigeration circuit includes a second compressor 072. The first refrigeration circuit and the second refrigeration circuit are backup for each other. When the first refrigeration circuit fails, the second refrigeration circuit takes over all the refrigeration work to ensure the machine The group operates without stopping; similarly, when the second refrigeration circuit fails, the first refrigeration circuit assumes all refrigeration work; the cold-carrying side includes a main circuit, a first branch circuit and a second branch circuit, the first branch circuit and the second branch circuit are connected in parallel, and can be respectively connected to the first heat exchanger 14 and perform heat exchange, and can be respectively connected to the main circuit and perform heat exchange, forming an independent at least partial cold-carrying circuit; the main circuit is connected to the first heat exchanger 14, the first branch circuit and the second branch circuit are respectively connected to a terminal, the first branch circuit includes a first pump 12, the second branch circuit includes a second pump 13, and the first branch circuit and the second branch circuit can be connected under preset conditions; in this embodiment , the first branch and the second branch serve as backup for each other. When a water pump failure occurs in one of the branches, the first branch and the second branch can be connected, and the water pump of the undamaged branch can provide refrigerant circulation; the backup of the refrigeration side and the cold-carrying side can effectively improve the fault tolerance of the cooling unit, and can cover a variety of faults through the backup, and ensure that the unit does not stop running and continues to provide cooling for the terminal; in other embodiments, more backups can be set, such as three refrigeration circuits and three cold-carrying branches; in other embodiments, no main road can be set on the cold-carrying side, and multiple branches can directly exchange heat with the first heat exchanger 14 respectively; In this embodiment, the terminal is an energy storage container; in other embodiments, the first branch can be provided with multiple water pumps in parallel, and the second branch can also be provided with multiple water pumps in parallel; the first heat exchanger 14 is a plate heat exchanger, the cooling side cools the plate heat exchanger, and the working fluid on the cold side flows through the plate heat exchanger, and further brings the cold to the terminal through the working fluid circulation to perform terminal cooling; in this embodiment, the two branches correspond to two terminals respectively, which can ensure that the two terminals have a backup design at the same time, each branch is not idle and wasted, which is more cost-effective, components are more fully utilized, the redundant design is more reasonable, and the fault tolerance rate is higher.

[0037] The cooling side also includes a main road, and the first branch and the second branch respectively form independent at least partial cooling circuits with the main road, and the main road is connected to the first heat exchanger 14; the working fluid flow path on the cooling side includes at least the first branch and / or the second branch, the main road, the first heat exchanger 14, the main road, the first branch and / or the second branch; in other embodiments, a first pump and a second pump or more pumps can be set on the main road to back up each other, and multiple branches are connected to the terminals via the main road to form branch loops, so that the main road assumes the backup function, and the backup pumps among the multiple pumps are in a dormant state during normal times, and only the first pump works normally as a working pump. When the working pump fails and is damaged, the backup pump is automatically enabled and switched to a working state; thereby, simultaneous backup of multiple terminals can be achieved, and the cost is lower and the control logic is simpler.

[0038] The cold-carrying side also includes a connecting pipe 05, which can connect the first branch and the second branch under preset conditions; in the present embodiment, the preset condition is that the first pump 12 is damaged or the second pump 13 is damaged, and the connecting pipe 05 can connect the first branch and the second branch after one of the first pump 12 of the first branch or the second pump 13 of the second branch is damaged, and the working fluid of the two branches is driven by the undamaged water pump; in other embodiments, the first branch and the second branch can be connected through a connecting groove.

[0039] The connecting pipe 05 is connected between the first pump 12 and the terminal, and the other end of the connecting pipe 05 is connected between the second pump 13 and the other terminal.

[0040] The main circuit includes a temperature sensor and / or a pressure sensor; the first branch circuit and / or the second branch circuit include a temperature sensor and / or a pressure sensor.

[0041] The main circuit also includes a main circuit temperature sensor 031 and a main circuit pressure sensor 041; the first branch includes a first branch circuit pressure sensor 042 and a first branch circuit temperature sensor 032, and the second branch includes a second branch circuit pressure sensor 043 and a second branch circuit temperature sensor 033; in this embodiment, the main circuit has a main circuit temperature sensor 031 and a main circuit pressure sensor 041, and the first branch and the second branch have pressure sensors respectively; in other embodiments, the first branch and the second branch may also be provided with temperature sensors respectively.

[0042] A constant pressure component is provided between the first branch and the second branch; further, the constant pressure component is a constant pressure tank 20.

[0043] The first branch also includes a liquid collector, an evaporator, and a liquid separator; forming a flow path of the main road, a liquid separator, an evaporator, a liquid collector, a first pump 12, and the main road; in this embodiment, the first branch also includes a liquid separator, an evaporator, a liquid collector, and a check valve 15, and the working fluid flowing out of the main road passes through the liquid separator, the evaporator, the liquid collector, the first liquid pump, and the check valve 15 in sequence, and finally flows back to the main road; in this embodiment, when one of the first branch or the second branch fails, the check valve prevents the working fluid from flowing back, and the evaporator is a plurality of parallel liquid cooling plates; in other embodiments, the liquid separator and the liquid collector may not be used.

[0044] The second branch also includes a liquid collector, an evaporator, and a liquid separator; forming a flow path of the main road, a liquid separator, an evaporator, a liquid collector, a second pump 13, and the main road; in this embodiment, the second branch has the same configuration as the first branch; in other embodiments, the second branch may be different from the first branch in configuration.

[0045] The main circuit also includes a spherical filter 23 and a pipe heater, forming a flow path of the first branch and / or the second branch, the first heat exchanger 14, the spherical filter 23, the pipe heater, the first branch and / or the second branch.

[0046] The first branch and the second branch are respectively provided with an evaporator, and the evaporator includes at least one group of liquid cooling plates; the liquid cooling plates are used for heat exchange with the terminal.

[0047] It also includes a liquid replenishment circuit, which connects the first branch and the second branch. The liquid replenishment circuit includes a liquid storage tank 18 and a liquid replenishment pump 16, which are used to replenish the working fluid to the cooling side. In this embodiment, the liquid replenishment circuit connects the first branch and the second branch, and can replenish the working fluid to the cooling side in time. In this embodiment, the working fluid on the cooling side is a mixture of water and ethylene glycol.

[0048] The first refrigeration circuit also includes a condenser 02, a fan 01, a drying filter 10, a throttle valve 08, a gas-liquid separator 09 and a pressure switch 06, forming a circuit of a first heat exchanger 14, a gas-liquid separator 09, a first compressor, a pressure switch 06, a condenser 02, a drying filter 10, a throttle valve 08 and a first heat exchanger 14.

[0049] The second refrigeration circuit also includes a condenser 02, a fan 01, a drying filter 10, a throttle valve 08, a gas-liquid separator 09 and a pressure switch 06, forming a circuit of a first heat exchanger 14, a gas-liquid separator 09, a second compressor, a pressure switch 06, a condenser 02, a drying filter 10, a throttle valve 08, and a first heat exchanger 14; in this embodiment, the first refrigeration circuit and the second refrigeration circuit are two identical branches, which are not interconnected, and respectively perform cooling and heat exchange on the first heat exchanger 14.

[0050] The fan is a variable frequency fan; in the present embodiment, the fan is a variable frequency fan, when the ambient temperature changes or the power of the cooling unit changes, the fan can adjust the frequency, increase or decrease the frequency to meet the cooling needs.

[0051] The first refrigeration circuit and / or the second refrigeration circuit include a temperature sensor and / or a pressure sensor; in the present embodiment, the first refrigeration circuit and the second refrigeration circuit respectively have a temperature sensor and a pressure sensor, which can more accurately monitor the working status of the first refrigeration circuit and the second refrigeration circuit; in other embodiments, the first refrigeration circuit and the second refrigeration circuit may only have a temperature sensor or a pressure sensor.

[0052] The condenser 02 is provided with a condenser temperature sensor, the first compressor 071 and the second compressor 072 are respectively provided with an intake pressure sensor 044 and an intake temperature sensor 034, as well as an exhaust temperature sensor 035 and an exhaust pressure sensor 045; providing multiple groups of temperature sensors and pressure sensors can accurately grasp the working status of each component, which is conducive to fault detection.

[0053] The first compressor 071 and / or the second compressor 072 are variable frequency compressors; the first pump 12 and / or the second pump 13 are variable frequency pumps; in this embodiment, the first compressor 071 and the second compressor 072 are variable frequency compressors respectively, when one of the first refrigeration circuit or the second refrigeration circuit fails and stops running, the refrigeration circuit that has not failed will increase the frequency according to the refrigeration demand of the terminal, and when the first compressor 071 or the second compressor 072 is upgraded to full frequency operation, the refrigeration capacity of the refrigeration circuit is greater than or equal to the sum of the refrigeration capacities of the first refrigeration circuit and the second refrigeration circuit at the ambient temperature when no failure occurs, thus, when one of the refrigeration circuits fails, the other refrigeration circuit that has not failed will be used for operation. The refrigeration side can achieve complete backup, provide the same cooling capacity as the two refrigeration circuits when there is no fault, meet the refrigeration needs of the terminal, and improve the fault tolerance of the refrigeration system; in this embodiment, the first pump 12 and the second pump 13 are variable frequency pumps respectively. When the first water pump of the first branch fails, the second water pump will increase the frequency. At the same time, the connecting pipe 05 connects the first branch with the second branch. The second water pump after the frequency increase can simultaneously make the first branch and the second branch reach the flow rate when the first water pump is not damaged, thereby achieving complete backup of the cold-carrying side, and further forming a dual cooling unit on the refrigeration side and the cold-carrying side, which can adapt to various fault conditions without affecting the refrigeration process, and has extremely high fault tolerance and stability.

[0054] Example 2

[0055] The difference from Example 1 is that in this embodiment, the first compressor 071 is a variable frequency compressor, and the second compressor 072 is a fixed frequency compressor; thereby, the cost can be reduced to a certain extent, and in the event of a failure in the second refrigeration circuit, the normal operation of the unit can be guaranteed to provide the required sufficient cooling capacity; when a failure occurs in the first refrigeration circuit, partial refrigeration function can be achieved, delaying the shutdown time of the entire unit due to the failure.

[0056] Example 3

[0057] The difference from the first embodiment is that in this embodiment, the first pump 12 is a variable frequency pump, and the second pump 13 is a fixed frequency pump.

[0058] Example 4

[0059] The difference from Embodiment 2 is that in this embodiment, the first pump 12 is a variable frequency pump, and the second pump 13 is a fixed frequency pump.

[0060] Example 5

[0061] The difference from Example 1 is that in this embodiment, only the cooling side is designed as a backup, and the cooling side is a single system;

[0062] Example 6

[0063] like Figure 2 , 4 As shown, the difference from Example 1 is that this embodiment also includes a natural cooling circuit, the natural cooling circuit includes a dry cooler 17 and a three-way valve, the natural cooling circuit is connected to the main road, and the flow path of the natural cooling circuit at least includes the main road, the three-way valve 19, the dry cooler 17, and the main road, forming a natural cooling circuit of the main road, the three-way valve, the dry cooler 17, and the main road; in this embodiment, the condenser 02 is a dual-system condenser, and the dual-system condenser 02 includes the dry cooler 17.

[0064] The three-way valve is arranged on the main section where the first branch and the second branch flow to the first heat exchanger 14. The working fluid can flow into the dry cooler 17 through the three-way valve. The dry cooler 17 exchanges heat with the external environment through the fan, uses the ambient temperature to cool the working fluid, and improves the cooling efficiency.

[0065] Example 7

[0066] like Figure 3 As shown, a cooling method comprises the following steps:

[0067] S01: The cooling unit starts and the main control board scans the unit;

[0068] S02: The main control board determines the scanning signal. If the scanning signal is normal, the cooling unit is adjusted to operate in the first cooling mode; if the scanning signal is abnormal, an abnormality is identified and an abnormality processing signal is output;

[0069] S03: the cooling unit operates in one of the first cooling mode, the backup mode and the standby mode according to the abnormal processing signal;

[0070] In the first refrigeration mode, the refrigeration capacity of the cooling unit is Q1. In the backup mode, the refrigeration capacity of the cooling unit is Q2, and Q1 / 2≤Q2≤Q1 is satisfied. In the standby mode, the backup refrigeration unit is shut down.

[0071] The backup modes include a first backup mode, a second backup mode, and a third backup mode.

[0072] In this embodiment, the cooling unit will automatically determine the operating status of the unit and control the cooling unit to operate in different modes. The first refrigeration mode is the normal working mode. The first refrigeration circuit and the second refrigeration circuit are all operating normally, and the first branch and the second branch are also all normal. At this time, at the ambient temperature, the cooling capacity of the cooling unit is Q1. In addition, when an abnormality occurs in a part of the cooling unit, the main control board will output an abnormal processing signal according to the different faults, thereby adjusting the operating mode of the unit. When the abnormality is relatively minor and does not affect the operation of the cooling unit, it still operates in the first refrigeration mode. When certain specific faults occur, the main control board controls the cooling unit to switch from the first refrigeration mode to the first backup mode. The first backup mode, the second backup mode or the third backup mode, wherein the first backup mode, the second backup mode and the third backup mode correspond to different fault conditions respectively. At this time, the cooling capacity of the cooling unit can still provide Q1 or a cooling capacity exceeding Q1 / 2. Therefore, after a fault occurs, the system can be temporarily adjusted to temporarily shelve the fault. The normal refrigeration is guaranteed through redundant configuration, the fault tolerance of the system is improved, the continuous and stable operation of the unit is guaranteed, and the impact on the terminal is minimized. This is of great significance for some terminals that require all-weather refrigeration. In this embodiment, the unit scan in S01 is a real-time scan; in other embodiments, a scan can be performed at intervals.

[0073] The unit scan in S01 includes collecting at least one of the temperature data in the refrigeration side and the temperature data in the cooling side by the main control board; in the present embodiment, the main control board collects the temperature data in the refrigeration side and the temperature data in the cooling side, and compares them with the preset data, so as to accurately determine the operating status of the cooling unit, find the location of the fault, and initiate the corresponding processing strategy; in other embodiments, only one of the temperature data in the refrigeration side and the temperature data in the cooling side may be collected.

[0074] The temperature data on the cooling side includes at least one of the data of the condenser temperature sensor 036, the data of the suction temperature sensor 034, and the data of the exhaust temperature sensor 035; the temperature data on the cooling side includes at least one of the temperature data of the main circuit temperature sensor 031, the first branch circuit temperature sensor 032, and the second branch circuit temperature sensor 033. In this embodiment, the first refrigeration circuit and the second refrigeration circuit on the cooling side are respectively provided with a condenser temperature sensor 036 on the condenser 02, and the suction temperature sensor 034 and the exhaust temperature sensor 035 are respectively provided on the inlet side and the outlet side of the first compressor 071 and the second compressor 072; and the main circuit temperature sensor 031 is provided in the path from the main circuit on the cooling side to the first branch and the second branch. The provision of multiple sensors enables the main control board to understand the operating status of each component or pipeline in the cooling unit, which is conducive to timely detection of faults and determination of the location of faults.

[0075] The unit scan in S01 includes collecting at least one of the pressure data on the refrigeration side and the pressure data on the cooling side by the main control board; pressure data is also an important indicator parameter. In this embodiment, the main control board collects temperature data and pressure data, and the pressure data includes the pressure data on the refrigeration side and the pressure data on the cooling side, which is conducive to determining the fault location; in other embodiments, fault judgment can be made only through temperature data and pressure data.

[0076] The pressure data on the refrigeration side includes at least one of the exhaust pressure sensor 045 data and the suction pressure sensor 044 data; the pressure data on the cold load side includes at least one of the first branch pressure sensor 042 data, the second branch pressure sensor 043 data, and the main pressure sensor 041 data; in this embodiment, the main control board will collect temperature data and exhaust pressure sensor 045 data, suction pressure sensor 044 data, first branch pressure sensor 042 data, second branch pressure sensor 043 data, and main pressure sensor 041 data during the S01 unit scanning process, and compare and comprehensively judge according to the preset data to determine the operating status of the cooling unit and accurately determine the location of the fault, which is conducive to later troubleshooting.

[0077] The unit scan in S01 includes collecting the fault codes of various components; in this embodiment, when a fault occurs in each component of the cooling unit, a corresponding fault code will be sent. The main control board can determine the type of fault based on the fault code, and then output a corresponding abnormal processing signal. The fault code may include but is not limited to the fault codes of the first compressor 071 and the second compressor 072, the fault code of the fan, the fault code of the first water pump and the second water pump, and other functional components. Fault codes.

[0078] The scanning abnormality in S02 includes that the temperature data and pressure data collected in S01 exceed the range of preset data, and / or the fault code is scanned; in the present application, the preset data is not a set of fixed data, but a set of data dynamically set according to the ambient temperature, refrigeration demand, pipeline layout, etc., and the preset data of each sensor may be different. For a certain temperature sensor data, the preset data can be a specified maximum temperature warning value under the ambient temperature, or a set of temperature intervals including a minimum temperature warning value and a maximum temperature warning value. If the temperature is higher than the maximum temperature warning value or lower than the minimum temperature warning value, it is judged to exceed the range of preset data or the temperature is lower than the minimum temperature warning value. For a certain pressure sensor data, the preset data can be a minimum pressure warning value, or a set of pressure intervals including a minimum pressure warning value and a maximum pressure warning value. If the temperature is lower than the minimum pressure warning value or higher than the maximum pressure warning value, it is judged to be In this embodiment, multiple judgment methods are used to collect temperature data, pressure data and fault codes at the same time for comprehensive judgment; in other embodiments, only one of them can be used.

[0079] The abnormal processing signal in S03 includes: when the first refrigeration circuit or the second refrigeration circuit fails, and the first branch and the second branch are normal, a first type of abnormal processing signal is output, and the cooling unit operates in the first backup mode; when the first refrigeration circuit and the second refrigeration circuit are normal, and the first branch or the second branch fails, a second type of abnormal processing signal is output, and the cooling unit operates in the second backup mode; when the first refrigeration circuit or the second refrigeration circuit fails, and the first branch or the second branch fails, a third type of abnormal processing signal is output, and the cooling unit operates in the third backup mode; when the first refrigeration circuit or the second refrigeration circuit fails, and the first branch or the second branch fails, a third type of abnormal processing signal is output, and the cooling unit operates in the third backup mode; If the refrigeration circuit is normal, and both the first branch and the second branch fail or other conditions occur, five types of abnormal processing signals are output, and the cooling unit operates in standby mode; in this embodiment, when the pressure data of the suction pressure sensor 044 and the exhaust pressure sensor 045 of the first refrigeration circuit exceed the preset data range, the pressure data of the suction pressure sensor 044 and the exhaust pressure sensor 045 of the second refrigeration circuit do not exceed the preset data range, and at the same time, the pressure of the first branch pressure sensor 042 and the second branch pressure sensor 043 do not exceed the preset data range, the temperature sensors on the refrigeration side and the cold load side The data of the device will increase. At this time, it is judged that the first refrigeration circuit or the second refrigeration circuit fails. If the first branch and the second branch are normal, a type of abnormal processing signal is output. At the same time, the fault warning of the unit is triggered. According to the pressure and temperature sensors and fault codes in different parts, the location of the fault can be accurately determined, which is conducive to handling the fault; when the pressure data of each pressure sensor in the first refrigeration circuit and the second refrigeration circuit does not exceed the preset data range, the pressure data of the first branch pressure sensor 042 and the temperature data of the first branch temperature sensor 032 exceed the preset data range, the pressure data of the main pressure sensor 041 exceeds the preset data range, the pressure data of the second branch pressure sensor 043 and the temperature data of the second branch temperature sensor 033 do not exceed the preset data range, the temperature data of each temperature sensor on the refrigeration side has no obvious change, and the data of the main temperature sensor 031 has no obvious change, it is judged that the first refrigeration circuit and the second refrigeration circuit are normal, and the first branch or the second branch fails, then the second type of abnormal processing signal is output, and the cooling unit operates in the second backup mode. If the fault code information of the first water pump is further received, it is further confirmed that the first water pump is faulty;When the pressure data of the suction pressure sensor 044 and the exhaust pressure sensor 045 of the first refrigeration circuit exceed the preset data range, the pressure data of the suction pressure sensor 044 and the exhaust pressure sensor 045 of the second refrigeration circuit do not exceed the preset data range, and at the same time, the pressure data of the first branch pressure sensor 042 and the temperature data of the first branch temperature sensor 032 exceed the preset data range, the pressure data of the main pressure sensor 041 exceeds the preset data range, and the pressure data of the second branch pressure sensor 043 does not exceed the preset data range, the pressure data of the main pressure sensor 041 decreases, combined with the fault code, it is determined that when the first refrigeration circuit or the second refrigeration circuit fails, the first branch or the second branch fails, then three types of abnormal processing signals are output, and the cooling unit operates in the third backup mode. The specific faulty component is further confirmed according to the fault code information; when the first refrigeration circuit or the second refrigeration circuit fails, the first branch or the second branch fails. The pressure sensors of the cold circuit do not exceed the preset data, and the pressure data of the main circuit pressure sensor 041, the first branch pressure sensor 042, and the second branch pressure sensor 043 exceed the preset data range. Combined with the feedback information of the fault code, it is judged that when the first refrigeration circuit and the second refrigeration circuit are normal, the first branch and the second branch are both faulty, and five types of abnormal processing signals are output, and the cooling unit operates in standby mode. Similarly, when both the first refrigeration circuit and the second refrigeration circuit fail, the cooling unit also operates in standby mode. In standby mode, the refrigeration side and various components and the components on the cold side will stop working. In each backup mode, the cooling unit can continue to provide normal refrigeration work and full-power refrigeration work, and continue to provide the required refrigeration capacity for the terminal. Through redundant backup adjustment, the impact of component failure can be eliminated, and the operation can continue without stopping, thereby improving the continuity and reliability of the cooling unit. ;

[0080] The minimum frequency of the first compressor 071 and the second compressor 072 is F1, and the maximum frequency is F2. The minimum rotation speed of the first pump 12 and the second pump 13 is F3, and the maximum rotation speed is F4. The working frequency of the first compressor 071 and / or the second compressor 072 is FC, and the working rotation speed of the first pump 12 and / or the second pump 13 is FP. In the first refrigeration mode, F1≤FC≤F2 / 2, and F3≤FP≤F4 / 2. In this embodiment, the first compressor 071 and the second compressor 072 are variable frequency compressors, and the working frequency of the variable frequency compressor can be dynamically adjusted between the minimum frequency F1 and the maximum frequency F2. When the ambient temperature changes, in order to ensure the temperature stability of the terminal, the working frequency of the first compressor 071 and the second compressor 072 will increase to improve the refrigeration capacity. The first pump 12 and the second pump 13 are variable frequency pumps, and the working rotation speed can be adjusted between the minimum rotation speed F3 and the maximum rotation speed F4. When the heat generation of the terminal is relatively large and the refrigeration demand is relatively large, the first The operating speed of the first pump 12 and the second pump 13 will increase, the working fluid flow rate in the cold side will become faster, the flow rate will become larger, and the terminal will be cooled quickly. Furthermore, the frequency conversion of the first compressor 071 and / or the second compressor 072 and the frequency conversion of the first pump 12 and / or the second pump 13 can be carried out simultaneously, or only the frequency conversion of the compressor or the frequency conversion of the water pump can be carried out, and the strategy can be customized according to the specific situation. In this embodiment, when the first compressor 071 and the second compressor 072 respectively operate at half of the highest frequency F2 / 2, and the first pump 12 and the second pump 13 respectively operate at half of the highest speed F4 / 2, the refrigeration demand of the terminal can be met, so that the first compressor 071 and the second compressor 072 can be fully backed up. When the first compressor 071 cannot work, the second compressor 072 can be fully backed up by increasing the frequency to F2, and the cooling unit continues to operate stably. The first pump 12 and the second pump 13 can also be fully backed up, and the fault tolerance of the cooling unit will be greatly improved.

[0081] In the first backup mode, the operating frequency of the first compressor 071 or the second compressor 072 meets F2 / 2≤FC≤F2; in the second backup mode, the connecting pipe 05 connects the first branch with the second branch, and the operating speed of the first pump 12 or the second pump 13 meets F4 / 2≤FP≤F4; in the third backup mode, the connecting pipe 05 connects the first branch with the second branch, the operating frequency of the first compressor 071 or the second compressor 072 meets F2 / 2≤FC≤F2, and the operating speed of the first pump 12 or the second pump 13 meets F4 / 2≤FP≤F4. In the standby mode, the main control board controls the first compressor 071 and the second compressor 072 to stop, the first pump 12 and the second pump 13 to stop, and the cooling unit is on standby; in this embodiment, in the first backup mode, only one of the first refrigeration circuit and the second refrigeration circuit can work normally. In order to meet the refrigeration demand of the terminal, the one without failure will be frequency-upgraded, and one refrigeration circuit will cool the two terminals. At this time, the operating frequency of the compressor corresponding to the one without failure meets F2 / 2≤FC≤F2, and the specific value depends on the refrigeration demand of the terminal. The temperature of the second branch is determined by summing the ambient temperature; in the second backup mode, a pump of one of the first branch and the second branch fails, and the working fluid circulation of the corresponding branch cannot be performed. For example, the first pump 12 of the first branch fails. At this time, the connecting pipe 05 connects the first branch and the second branch, "short-circuits" the first pump 12, and the second pump 13 is frequency-upgraded. The operating speed of the second pump 13 meets F4 / 2≤FP≤F4. The second pump 13 provides working fluid circulation for the first branch and the second branch at the same time, and can continue to provide the required cooling capacity for the terminal; in the third backup mode, A refrigeration circuit on the refrigeration side fails, and at least a part of the refrigeration circuit on the cold-carrying side fails, for example, the first refrigeration circuit fails, and the first branch fails. At this time, the second compressor 072 of the second refrigeration circuit is frequency-upgraded, and the second pump 13 of the second branch is frequency-upgraded, and the second refrigeration circuit and the second branch are responsible for the refrigeration work of two loads. After the frequency upgrade, the cooling capacity of the second refrigeration circuit and the second branch can reach the cooling capacity of the first refrigeration circuit, the second refrigeration circuit, the second branch, and the first branch when they are working normally respectively. Therefore, the cooling unit can still continue to work normally.

[0082] Failure of the first refrigeration circuit includes damage to the first compressor 071 or other components, and failure of the second refrigeration circuit includes damage to the second compressor 072 or other components; failure of the first branch includes damage to the first pump 12, and failure of the second branch includes damage to the second pump 13; in this embodiment, the first refrigeration circuit and the second refrigeration circuit are two completely independent refrigeration systems, which back up each other. When any component of the first refrigeration circuit is damaged and causes the first refrigeration circuit to fail, the second refrigeration circuit can activate the backup function and take on the refrigeration work alone; the second branch and the first branch are partial backups, mainly completing the backup of the pump. When the first pump 12 is damaged, the backup of the second pump 13 can be activated.

[0083] In this application, the minimum operating frequency of the compressor is 25 Hz and the maximum operating frequency is 120 Hz.

[0084] In the present application, when the main control board scans the signal abnormally, it includes a slight abnormality in the cooling unit, which will not have a substantial impact on the refrigeration of the cooling unit. At this time, the cooling unit is still running in the first refrigeration mode; it also includes a fault, and the fault representative has been able to affect the normal operation of the cooling unit, such as compressor damage and pump damage. At this time, the main control board will control the cooling unit to operate in one of the first backup mode, the second backup mode, the third backup mode, and the standby mode; therefore, by setting multiple backup modes, it can adapt to multiple fault conditions, has strong anti-interference performance, high stability, and can run without stopping when encountering a fault, which has practical significance for scenarios that require long-term refrigeration.

[0085] Example 8

[0086] The present application also discloses another cooling method, including the above-mentioned cooling method, and also includes, optionally, the cooling unit in S03 can also operate in a natural cooling mode according to an abnormal processing signal. In the natural cooling mode, the cooling capacity of the cooling unit is Q3, and Q3≤Q1 / 2; the natural cooling mode is a natural cooling cycle, which can improve the cooling efficiency and save energy consumption; in this embodiment, the cooling unit in S03 can also operate in a natural cooling mode according to an abnormal processing signal. In the natural cooling mode, the cooling capacity of the cooling unit is Q3, and Q3≤Q1 / 2, and the abnormal processing signal in S03 also includes that when both the first refrigeration circuit and the second refrigeration circuit fail, the first branch and\or the second branch are normal, four types of abnormal processing signals are output, and the cooling unit operates in the natural cooling mode; in this embodiment, a natural cooling circuit is also provided, and the natural cooling circuit exchanges heat with the environment through dry cooling. In other backup modes, the natural cooling circuit is used as a supplement Refrigeration can reduce the workload of the first refrigeration circuit and the second refrigeration circuit and save energy. When the pressure data of the suction pressure sensor 044 and the exhaust pressure sensor 045 of the first refrigeration circuit exceed the preset data range, the pressure data of the suction pressure sensor 044 and the exhaust pressure sensor 045 of the second refrigeration circuit exceed the preset data range, and at the same time the pressure of the first branch pressure sensor 042 and the second branch pressure sensor 043 does not exceed the preset data range, the temperature sensor data on the refrigeration side and the cold load side will increase, then it is judged that both the first refrigeration circuit and the second refrigeration circuit have failed. At this time, all refrigeration work will be performed by the natural cooling circuit. When the ambient temperature is low, such as winter in the north, the natural cooling circuit can provide sufficient cooling capacity to continue to cool the terminal. When the ambient temperature is not low enough, the natural cooling circuit can delay the arrival time of the system entering the standby mode, which can buy time for emergency repairs and provide system stability. Optionally, the abnormal processing signal in S03 also includes: when both the first refrigeration circuit and the second refrigeration circuit fail, and the first branch and / or the second branch are normal, four types of abnormal processing signals are output, and the cooling unit operates in natural cooling mode; when both the first refrigeration circuit and the second refrigeration circuit fail, the natural cooling circuit can play a cooling role in a short time as a backup.

[0087] Optionally, in the natural cooling mode, the first compressor and the second compressor are shut down, and the operating speeds of the first pump and the second pump meet F3≤FP≤F4; in the natural cooling mode, the first compressor 071 and the second compressor 072 are shut down, and the operating speeds of the first pump 12 and the second pump 13 meet F3≤FP≤F4; in the natural cooling mode, the first refrigeration circuit and the second refrigeration circuit are all faulty, and the first branch and / or the second branch are normal. At this time, refrigeration can only be carried out through the natural cooling circuit. The refrigeration capacity at this time has been greatly reduced. The speed of the second pump 13 and / or the first pump 12 can be adjusted according to the ambient temperature. In this embodiment, the natural cooling mode is more of an emergency measure to prevent the terminal from losing refrigeration in a short period of time, and to buy more time for the staff to repair the failure on the refrigeration side.

[0088] Example 9

[0089] The present application also discloses a control device, including a processor and a memory, wherein the memory stores a computer program that can be executed by the processor, and when the computer program is executed by the processor, the cooling method of embodiment 7 or 8 described above is implemented.

[0090] Example 10

[0091] The present application also discloses a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a controller, the cooling method of Embodiment 7 or 8 described above is implemented.

[0092] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cooling unit, comprising a refrigeration side, a cooling-carrying side, and a first heat exchanger (14), wherein the refrigeration side and the cooling-carrying side perform heat exchange through the first heat exchanger (14), wherein the refrigeration side comprises a condenser (02), a throttle valve (08), and a compressor, and wherein: The cooling side comprises a first branch and a second branch, the first branch and the second branch are connected in parallel and can be connected to a first heat exchanger (14) respectively; the first branch and the second branch are respectively connected to a terminal, the first branch comprises a first pump (12), the second branch comprises a second pump (13), and the first branch and the second branch can be connected under preset conditions.

2. The cooling unit according to claim 1, characterized in that: The cooling side also includes a main circuit, the first branch circuit and the second branch circuit are respectively connected to the main circuit, and the main circuit is connected to the first heat exchanger (14); the working medium flow path of the cooling side at least includes the first branch circuit and / or the second branch circuit, the main circuit, the first heat exchanger (14), the main circuit, the first branch circuit and / or the second branch circuit.

3. The cooling unit according to claim 2, characterized in that: The cooling side also includes a connecting pipe (05), which can connect the first branch and the second branch under preset conditions; the first end of the connecting pipe (05) is connected between the first pump (12) and the terminal, and the other end of the connecting pipe (05) is connected between the second pump (13) and another terminal.

4. The cooling unit according to claim 2, characterized in that: The main circuit includes a temperature sensor and / or a pressure sensor for detecting the operating status of the main circuit; the first branch circuit and / or the second branch circuit include a temperature sensor and / or a pressure sensor for detecting the operating status of the corresponding branch circuit.

5. The cooling unit according to claim 4, characterized in that: The main circuit further comprises a main circuit temperature sensor (031) and a main circuit pressure sensor (041); the main circuit temperature sensor (031) is used to detect the temperature of the main circuit, and the main circuit pressure sensor (041) is used to detect the pressure of the main circuit; the first branch circuit comprises a first branch circuit pressure sensor (042) and a first branch circuit temperature sensor (032); the first branch circuit pressure sensor (042) is used to detect the pressure of the first branch, and the first branch circuit temperature sensor (032) is used to detect the temperature of the first branch; the second branch circuit comprises a second branch circuit pressure sensor (043) and a second branch circuit temperature sensor (033); the second branch circuit pressure sensor (043) is used to detect the pressure of the second branch, and the second branch circuit temperature sensor (033) is used to detect the temperature of the second branch.

6. The cooling unit according to claim 1 or 2, characterized in that: It also includes a liquid replenishment circuit, the liquid replenishment circuit connects the first branch and the second branch, and the liquid replenishment circuit includes a liquid storage tank (18) and a liquid replenishment pump (16) for replenishing working fluid to the cooling side.

7. The cooling unit according to any one of claims 1 to 5, characterized in that: The refrigeration side includes a first refrigeration circuit and a second refrigeration circuit, the first refrigeration circuit and the second refrigeration circuit each include a condenser (02) and a throttle valve (08), the first refrigeration circuit and the second refrigeration circuit are respectively connected to a first heat exchanger (14), the first refrigeration circuit includes a first compressor (071), and the second refrigeration circuit includes a second compressor (072); the first refrigeration circuit and / or the second refrigeration circuit include a temperature sensor (02) and / or a pressure sensor for detecting the operating status of the first refrigeration circuit and / or the second refrigeration circuit.

8. The cooling unit according to claim 7, characterized in that: The condenser (02) is provided with a condenser temperature sensor (036), and the first compressor (071) and the second compressor (072) are respectively provided with an intake pressure sensor (044) and an intake temperature sensor (034), and are also connected to an exhaust temperature sensor (035) and an exhaust pressure sensor (045).

9. The cooling unit according to claim 7, characterized in that: It also includes a natural cooling circuit, the natural cooling circuit includes a dry cooler (17) and a three-way valve (19), the natural cooling circuit is connected to the main road, and the flow path of the natural cooling circuit at least includes the main road, the three-way valve (19), the dry cooler (17), and the main road.

10. The cooling unit according to claim 2, characterized in that: The first compressor (071) and / or the second compressor (072) are variable frequency compressors; the first pump (12) and / or the second pump (13) are variable frequency pumps.

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