A dual-system environmental control device with three compressors that can be backed up by each other

Abstract

The present invention discloses a dual-system environmental control device with three compressors that can be mutually backed up, including a first refrigeration system, a second refrigeration system, and a backup compressor. The first refrigeration system includes a first compressor, a first condenser, and a first evaporator. The second refrigeration system includes a second compressor, a second condenser, and a second evaporator. Solenoid valves are respectively installed on the return ports and outlet pipelines of the first and second compressors. Two pipelines are respectively connected to the return port and the outlet end of the backup compressor, and solenoid valves are respectively installed on each pipeline. The outlet pipelines are respectively bypass-connected to the outlet pipelines of the first compressor and the second compressor, and the return pipelines are respectively bypass-connected to the return pipelines of the first compressor and the second compressor. The present invention can meet the redundant backup environmental adjustment function under any working conditions.

Description

Technical Field

[0001] The present invention relates to the field of environmental control equipment, and specifically to a dual-system environmental control equipment that uses three compressors that can back up each other. Background Art

[0002] As the overall temperature and humidity control equipment, the environmental control equipment mainly completes the functions of temperature adjustment, dehumidification, and ventilation inside it. It is generally required to use a dual-system environmental control equipment to provide temperature and humidity guarantee. At the same time, during the use of the environmental control equipment, if the compressors of one or both refrigeration systems fail and cannot work, the backup compressor is controlled to be switched to be used for backup of one refrigeration system to achieve the overall internal temperature and humidity adjustment function, or to be used for derated backup of both refrigeration systems to achieve the temperature and humidity adjustment function. Due to the existence of various operating conditions that require compressor redundancy adjustment, the traditional refrigeration system redundancy method cannot meet the requirements. Therefore, a redundancy method in which three compressors can back up each other is provided, which can meet the redundancy backup environmental adjustment function under any operating conditions. Summary of the Invention

[0003] The present invention provides a dual-system environmental control equipment that uses three compressors that can back up each other to solve the problem that the existing refrigeration system redundancy scheme of the environmental control equipment cannot meet the needs of various operating conditions.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] A dual-system environmental control equipment that uses three compressors that can back up each other includes a first refrigeration system, a second refrigeration system, and a backup compressor. The first refrigeration system includes a refrigeration cycle loop formed by connecting a first compressor, a first condenser, and a first evaporator through pipelines. The second refrigeration system includes a refrigeration cycle loop formed by connecting a second compressor, a second condenser, and a second evaporator through pipelines. Electromagnetic valves are respectively installed at the return port pipelines and the outlet port pipelines of the first compressor and the second compressor; the outlet end of the backup compressor is connected with two output pipelines, and each output pipeline is respectively installed with an electromagnetic valve. The two output pipelines are respectively bypass-connected to the outlet port pipelines of the first compressor and the second compressor; the return port of the backup compressor is connected with two return air pipelines, and each return air pipeline is respectively installed with an electromagnetic valve. The two return air pipelines are respectively bypass-connected to the return port pipelines of the first compressor and the second compressor.

[0006] Further, the return port of the first compressor is also connected to the return port of the second compressor through a pipeline with an electromagnetic valve, and the outlet end of the first compressor is also connected to the outlet end of the second compressor through a short circuit with an electromagnetic valve.

[0007] Further, the electromagnetic valves are all electromagnetic cut-off valves.

[0008] Further, it also includes a controller, and the controller is respectively and electrically connected to each solenoid valve for control.

[0009] The present invention includes two refrigeration systems. Each refrigeration system contains 1 compressor. The backup compressor is respectively connected in parallel with the compressors of the other two systems through pipelines and solenoid valves. If a certain compressor fails, the environmental control equipment can control the opening and closing of the solenoid valves, and through the backup use between the compressors without shutting down the machine, to ensure the normal use of each refrigeration system.

[0010] Compared with the prior art, the advantages of the present invention are as follows:

[0011] 1. The present invention is a dual-system environmental control equipment that utilizes three compressors that can backup each other. If a compressor inside the system fails, the environmental control equipment can control the opening and closing of the solenoid valves, and through the backup use between the compressors without shutting down the machine, to ensure the normal use of each refrigeration system.

[0012] 2. The two systems of the present invention are independent of each other, can work simultaneously or independently. When one system fails, it does not affect the normal operation of the other system.

[0013] 3. The present invention has three control modes: local control, automatic operation, and host computer program control. The control is flexible and the operation is convenient. Through the host computer, the temperature, humidity, air flow rate of the air inside the overall system, as well as the working state and fault information of the environmental control equipment can be remotely controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic structural diagram of an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The present invention will be further described below in conjunction with the drawings and embodiments.

[0016] As Figure 1 shown, this embodiment discloses a dual-system environmental control equipment that utilizes three compressors that can backup each other, including a first refrigeration system, a second refrigeration system, and a backup compressor 1-3.

[0017] The first refrigeration system includes a first compressor 1-1, a first condenser 2-1 equipped with a first condensing fan 9-1, a first liquid receiver 3-1, a first sight glass 4-1, a first expansion valve 5-1, a first evaporator 6-1 equipped with a first centrifugal fan 8-1, and a first gas-liquid separator 7-1. The outlet end of the first compressor 1-1 is connected to the inlet end of the first condenser 2-1 through a pipeline with a first solenoid valve a. The outlet end of the first condenser 2-1 is connected to the inlet end of the first liquid receiver 3-1 through a pipeline. The outlet end of the first liquid receiver 3-1 is connected to the inlet end of the first sight glass 4-1 through a pipeline. The outlet end of the first sight glass 4-1 is connected to the inlet end of the first expansion valve 5-1 through a pipeline. The outlet end of the first expansion valve 5-1 is connected to the inlet end of the first evaporator 6-1 through a pipeline. The outlet end of the first evaporator 6-1 is connected to the inlet end of the first gas-liquid separator 7-1 through a pipeline. The outlet end of the first gas-liquid separator 7-1 is connected to the return port end of the first compressor 1-1 through a pipeline with a second solenoid valve b, thereby forming a refrigeration cycle loop of the first refrigeration system.

[0018] The second refrigeration system includes a second compressor 1-2, a second condenser 2-2 equipped with a second condensing fan 9-2, a second liquid receiver 3-2, a second sight glass 4-2, a second expansion valve 5-2, a second evaporator 6-2 equipped with a second centrifugal fan 8-2, and a second gas-liquid separator 7-2. The outlet end of the second compressor 1-2 is connected to the inlet end of the second condenser 2-2 through a pipeline with a third solenoid valve c. The outlet end of the second condenser 2-2 is connected to the inlet end of the second liquid receiver 3-2 through a pipeline. The outlet end of the second liquid receiver 3-2 is connected to the inlet end of the second sight glass 4-2 through a pipeline. The outlet end of the second sight glass 4-2 is connected to the inlet end of the second expansion valve 5-2 through a pipeline. The outlet end of the second expansion valve 5-2 is connected to the inlet end of the second evaporator 6-2 through a pipeline. The outlet end of the second evaporator 6-2 is connected to the inlet end of the second gas-liquid separator 7-2 through a pipeline. The outlet end of the second gas-liquid separator 7-2 is connected to the return port end of the second compressor 1-2 through a pipeline with a fourth solenoid valve d, thereby forming a refrigeration cycle loop of the second refrigeration system.

[0019] The outlet end of the backup compressor 1-3 is connected with two output pipelines. One output pipeline is equipped with a fifth solenoid valve e and is bypass-connected to the pipeline between the first solenoid valve a at the outlet end of the first compressor 1-1 and the first condenser 2-1 in the first refrigeration system. The other output pipeline is equipped with a seventh solenoid valve g and is bypass-connected to the pipeline between the third solenoid valve c at the outlet end of the second compressor 1-2 and the second condenser 2-2 in the second refrigeration system.

[0020] The return ports of backup compressors 1-3 are connected to two input pipelines. One of the input pipelines is equipped with a sixth solenoid valve f and is bypass-connected to the pipeline between the second solenoid valve b at the return port of the first compressor 1-1 and the first gas-liquid separator 7-1 in the first refrigeration system. The other input pipeline is equipped with an eighth solenoid valve h and is bypass-connected to the pipeline between the fourth solenoid valve d at the return port of the second compressor 1-2 and the second gas-liquid separator 7-2 in the second refrigeration system.

[0021] A pipeline with a ninth solenoid valve i is also bypassed from the pipeline between the third solenoid valve c at the outlet of the second compressor 1-2 and the second condenser 2-2. This pipeline is bypass-connected to the pipeline between the first solenoid valve a at the outlet of the first compressor 1-1 and the first condenser 2-1 in the first refrigeration system.

[0022] A pipeline with a tenth solenoid valve j is also bypassed from the pipeline between the second solenoid valve b at the return port of the first compressor 1-1 and the first gas-liquid separator 7-1. This pipeline is bypass-connected to the pipeline between the fourth solenoid valve d at the return port of the second compressor 1-2 and the second gas-liquid separator 7-2 in the second refrigeration system.

[0023] It also includes a controller, which is respectively electrically connected to the first solenoid valve a, the second solenoid valve b, the third solenoid valve c, the fourth solenoid valve d, the fifth solenoid valve e, the sixth solenoid valve f, the seventh solenoid valve g, the eighth solenoid valve h, the ninth solenoid valve i, and the tenth solenoid valve j for control.

[0024] When the first refrigeration system is operating normally, the low-temperature and low-pressure gas becomes a high-temperature and high-pressure gas after doing work through the first compressor 1-1. Subsequently, it undergoes condensation and heat dissipation through the first condenser 2-1 and the first condensing fan 9-1 to become a medium-temperature and medium-pressure liquid. Then, after passing through the first liquid storage tank 3-1, the filter, and the first sight glass 4-1, it undergoes throttling and pressure reduction through the expansion valve 5-1 to become a low-temperature and low-pressure liquid. After evaporation and heat dissipation through the first evaporator 6-1 and the first centrifugal fan 8-1, it becomes a low-temperature and low-pressure gas, and then returns to the compressor after passing through the first gas-liquid separator 7-1 for cyclic operation.

[0025] When the second refrigeration system is operating normally, the low-temperature and low-pressure gas is compressed by the second compressor 1-2 to become a high-temperature and high-pressure gas. Subsequently, it undergoes condensation and heat dissipation through the second condenser 2-2 and the second condenser fan 9-2 to become a medium-temperature and medium-pressure liquid. Then, after passing through the second liquid storage tank 3-2, the filter, and the second sight glass 4-2, it passes through the expansion valve 5-2 for throttling and pressure reduction to become a low-temperature and low-pressure liquid. After evaporation and heat dissipation through the second evaporator 6-2 and the second centrifugal fan 8-2, it becomes a low-temperature and low-pressure gas, and then returns to the compressor through the gas-liquid separator 7-2 for cyclic operation. If the compressor of the first refrigeration system or the second refrigeration system fails at this time, or if the compressors of both the first and second refrigeration systems fail simultaneously, only by shutting down the environmental control equipment can the cause of the compressor failure be investigated. Either for a long time for maintenance or replacing the compressor. In both of these methods, the environmental control equipment cannot be used normally during the maintenance period, thus unable to ensure the temperature and humidity requirements of the overall working conditions.

[0026] The environmental control equipment of the present invention connects the backup compressor in series with the first refrigeration system and the second refrigeration system through pipelines. One-way solenoid valves are installed on the exhaust pipe, return pipe of each compressor, and the related pipelines. When the electrical control receives a signal of compressor failure, it can immediately switch to the backup compressor 1-3 for operation by controlling the opening and closing of the solenoid valves on the control loop without shutting down or affecting the refrigeration effect, to ensure the normal use of the first refrigeration system or the second refrigeration system. At the same time, it can also be switched to the backup compressor 1-3 to derate and work for both the first and second refrigeration systems simultaneously. And these three compressors are of the same model. After the compressor backup switch, the opening degree of the throttling device does not change, and at the same time, the refrigeration capacity and power consumption of the environmental control equipment do not change, ensuring the stability of the internal working conditions of temperature and humidity. The present invention can achieve the normal operation of the refrigeration system of the environmental control equipment through compressor backup under the following four compressor failure conditions;

[0027] Backup mode one; The backup compressor 1-3 backs up the first compressor 1-1 of the first refrigeration system:

[0028] When the first compressor 1-1 of the first refrigeration system of the environmental control equipment fails during operation, the electrical control will automatically determine that the first compressor 1-1 is open-circuited, directly start the backup compressor 1-3, and at the same time close the first solenoid valve a and the second solenoid valve b, open the fifth solenoid valve e and the sixth solenoid valve f, and close other solenoid valves. Finally, control the rotation speed of the backup compressor 1-3 to be the same as the rotation speed of the first compressor 1-1 before the failure. At this time, the environmental control equipment ensures the normal use of the first refrigeration system by switching to the backup compressor 1-3 for operation.

[0029] Backup mode two; The backup compressor 1-3 backs up the second compressor 1-2 of the second refrigeration system:

[0030] When the second compressor 1-2 of the second refrigeration system of the environmental control equipment fails during operation, the electrical control will automatically determine that the second compressor 1-2 is open-circuited, directly start the backup compressor 1-3, close the solenoid valves c and d at the same time, open the fifth solenoid valve g and the sixth solenoid valve h, and close other solenoid valves. Finally, control the speed of the backup compressor 1-3 to be the same as the speed of the second compressor 1-2 before the failure. At this time, the environmental control equipment ensures the normal use of the second refrigeration system by switching to the backup compressor 1-3 for operation.

[0031] Backup mode three; the second compressor 1-2 of the second refrigeration system backs up the first compressor 1-1 of the first refrigeration system:

[0032] When the first compressor 1-1 of the first refrigeration system of the environmental control equipment fails during operation and the backup compressor 3-1 also fails, the electrical control will automatically determine that the first compressor 1-1 and the backup compressor 1-3 are open-circuited, directly start the second compressor 1-2 of the second refrigeration system, open the ninth solenoid valve i and the tenth solenoid valve j at the same time, and close other solenoid valves. Finally, control the speed of the second compressor 1-2 of the second refrigeration system to be the same as the speed of the first compressor 1-1 before the failure. At this time, the environmental control equipment gives priority to ensuring the normal use of the first refrigeration system by switching to the second compressor 1-2 of the second refrigeration system for operation.

[0033] Backup mode four; the backup compressor 1-3 simultaneously derates the use of the first refrigeration system and the second refrigeration system:

[0034] When the first compressor 1-1 of the first refrigeration system and the second compressor 1-2 of the second refrigeration system of the environmental control equipment both fail during operation, the electrical control will automatically determine that the first compressor 1-1 and the second compressor 1-2 are open-circuited, directly start the backup compressor 1-3, close the solenoid valves a, b, c, d, i, j at the same time, open the solenoid valves e, f, g, h. Finally, control the speed of the backup compressor 1-3 to be the same as the speed of the first compressor 1-1 or the second compressor 1-2 before the failure. At this time, the environmental control equipment realizes the derated use of the first refrigeration system and the second refrigeration system simultaneously by switching to the backup compressor 1-3 for operation.

[0035] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. The embodiments described in the present invention are only descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. Among the various specific technical features described in the above specific embodiments, they can be combined in any suitable manner without contradiction. As long as such a combination does not violate the idea of the present invention, it should also be regarded as the content disclosed in the present disclosure. To avoid unnecessary repetition, the present invention does not separately describe various possible combination methods.

[0036] The present invention is not limited to the specific details in the above embodiments. Without departing from the technical concept of the present invention and within the scope not deviating from the design idea of the present invention, various modifications and improvements made by those skilled in the art to the technical solution of the present invention shall fall within the protection scope of the present invention. The technical content claimed by the present invention has been fully recorded in the claims.

Claims

1. A dual-system environmental control device with three compressors that can be mutually backed up, characterized in that, It includes a first refrigeration system, a second refrigeration system, and a backup compressor. The first refrigeration system includes a refrigeration cycle loop formed by connecting a first compressor, a first condenser, and a first evaporator through pipelines. The second refrigeration system includes a refrigeration cycle loop formed by connecting a second compressor, a second condenser, and a second evaporator through pipelines. Solenoid valves are respectively installed at the return port pipelines and the outlet port pipelines of the first compressor and the second compressor; The outlet end of the backup compressor is connected with two output pipelines, and solenoid valves are respectively installed on each output pipeline. The two output pipelines are respectively bypass-connected to the outlet port pipelines of the first compressor and the second compressor; The return port of the backup compressor is connected with two return air pipelines, and solenoid valves are respectively installed on each return air pipeline. The two return air pipelines are respectively bypass-connected to the return port pipelines of the first compressor and the second compressor; The return port of the first compressor is also connected to the return port of the second compressor through a pipeline with a solenoid valve, and the outlet port of the first compressor is also connected to the outlet port of the second compressor through a pipeline with a solenoid valve; The solenoid valves are all electromagnetic shut-off valves.

2. The dual-system environmental control device with three compressors that can be mutually backed up according to claim 1, characterized in that, It further includes a controller, and the controller is respectively electrically connected to each solenoid valve for control.

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