Protection module, compressor, compressor system and control method of compressor system

Abstract

The invention relates to a protection module, a compressor, a compressor system and a control method of the compressor system. The protection module comprises a data acquisition part used for acquiring operation parameters of the compressor system; and the control part receives the operation parameters acquired by the data acquisition part and judges whether the compressor system has faults or not. And when the compressor system is judged to have a fault and the compressor of the compressor system needs to be locked or stopped, the control part sends a compressor instruction for locking or stopping the compressor. After the compressor command is issued, the control portion further determines whether the compressor is in forced operation, and when it is determined that the compressor is in forced operation, the control portion issues an alarm command through the alarm control port. According to the protection module, the compressor, the compressor system and the control method of the compressor system, whether the compressor is in forced operation or not is monitored, and when the compressor is in forced operation, protection control continues to be provided, an alarm is given, related personnel are reminded to remove faults as soon as possible, and the compressor is protected to the maximum extent.

Description

Technical Field

[0001] The present invention relates to a protection module, a compressor, a compressor system and a control method of the compressor system. More specifically, the present invention relates to a protection module connected to a compressor system, a compressor protected by the protection module, a compressor system having the protection module and a control method of the compressor system. Background Art

[0002] The contents in this section merely provide background information related to the present invention and may not constitute prior art.

[0003] In various applications of compressors, it is ideal that the compressor can operate properly to ensure the performance reliability of the compressor or the compressor system including the compressor. In order to ensure the normal and proper operation of the compressor, the compressor can be provided with a protection module, for example, to provide AC input protection, overheating protection, etc. In addition, in the protection module, the control of the injection enthalpy increase (EVI) function can also be integrated to improve the system energy efficiency, reduce the compressor exhaust temperature, and expand the operating range of the compressor.

[0004] After the compressor is powered on, the protection module detects the AC input of the compressor and starts the compressor protection monitoring. For compressors equipped with EVI modules and EVI control integrated in the protection module, the EVI control is also turned on. When the compressor stops running, the protection module detects that the AC power is turned off and stops various protection controls of the protection module accordingly.

[0005] During the operation of the compressor, the protection module tracks the operating status of the compressor through corresponding sensors. When a fault is detected and the compressor needs to be locked or shut down, the protection module will issue an instruction to lock or shut down the compressor, for example, an instruction to cut off the power supply to the compressor, and accordingly, each control module of the protection module stops running, for example, this includes: shutting down the EVI function module so that the electronic expansion valve used for EVI injection is closed to stop EVI injection; and stopping other overheat protection.

[0006] When a fault is detected and the compressor needs to be locked or shut down, although the protection module issues a command to lock or shut down the compressor, the compressor will still be forced to run when the contacts of the contactor are stuck or the control wiring of the compressor is bypassed by mistake. However, since the protection module has detected the fault, the protection module will be shut down and stop providing various protection controls. In addition, when the protection module is integrated with EVI control, the electronic expansion valve associated with the EVI control module will be closed. Therefore, the forced-running compressor continues to run without liquid / air injection, and the exhaust gas is prone to overheating, while the exhaust gas overheating protection cannot function normally, which causes the lubricating oil of the compressor to carbonize at high temperature, resulting in rapid failure of the compressor.

[0007] Therefore, it is necessary to improve the design of the protection module to overcome the above problems that may occur. Summary of the invention

[0008] An object of the present invention is to solve at least one of the above problems.

[0009] One aspect of the present invention is to provide a protection module, which is connected to a compressor system, and includes: a data acquisition unit, which is configured to acquire operating parameters of the compressor system; and a control unit, which is configured to receive the operating parameters acquired by the data acquisition unit, and determine whether the compressor system has a fault based on the operating parameters, and the control unit includes an alarm control port, wherein when the control unit determines that the compressor system has a fault and needs to lock or shut down the compressor of the compressor system, the control unit issues a compressor instruction to lock or shut down the compressor. After issuing the compressor instruction, the control unit further determines whether the compressor is in forced operation, and when it is determined that the compressor is in forced operation, the control unit issues an alarm instruction through the alarm control port.

[0010] The compressor system includes an injection enthalpy increase branch, and the control unit also includes an injection enthalpy increase control port, wherein when the control unit determines that the compressor is in forced operation, the control unit enables the injection enthalpy increase branch via the injection enthalpy increase control port.

[0011] The data acquisition unit includes an AC input signal acquisition port, which is configured to acquire an AC input signal of a power supply circuit of the compressor. When the AC input signal acquired by the AC input signal acquisition port indicates that the AC input is phase-missing, phase-misaligned, overvoltage, and / or undervoltage, the control unit determines that the compressor needs to be locked or shut down.

[0012] The data acquisition unit includes an exhaust signal acquisition port, which is configured to acquire the compressor exhaust temperature and / or the circuit connection status of the compressor exhaust temperature sensor. When the data acquired by the exhaust signal acquisition port indicates that the compressor exhaust temperature is too high and / or the circuit connection of the compressor exhaust temperature sensor is short-circuited or open-circuited, the control unit determines that the compressor needs to be locked or shut down.

[0013] The protection module also includes a power supply control port, and the compressor instruction is a power-off instruction issued through the power supply control port to power off the power supply circuit of the compressor. The data acquisition unit includes an AC input signal acquisition port, and the AC input signal acquisition port is configured to acquire the AC input signal of the power supply circuit of the compressor. After the control unit issues the compressor instruction, the control unit determines the current of the power supply circuit of the compressor according to the AC input signal acquired by the AC input signal acquisition port to determine whether the compressor is in forced operation.

[0014] The protection module also includes a memory, which stores thresholds of operating parameters, and stores collected operating parameters and control records executed by the protection module. After the control unit issues a compressor instruction, the control unit accesses the operating parameters and control records stored in the memory to determine whether the compressor is in forced operation.

[0015] Another aspect of the present invention is to provide a compressor, wherein the compressor is protected by using the protection module according to the present invention.

[0016] Another aspect of the present invention is to provide a compressor system, comprising: a compressor; a condenser connected to an exhaust port of the compressor; an evaporator connected to an air inlet of the compressor; and an alarm device. The compressor system further comprises a protection module according to the present invention, an alarm control port of the protection module is connected to the alarm device, and the protection module is configured to send an alarm instruction to the alarm device via the alarm control port to activate the alarm device to send an alarm.

[0017] The compressor system further includes an injection enthalpy increase branch connected to an injection enthalpy increase port of the compressor. When the protection module determines that the compressor is in forced operation, the protection module enables the injection enthalpy increase branch to provide injection enthalpy increase injection.

[0018] The compressor system also includes a protection relay. When the protection module determines that there is a fault in the compressor system and the compressor of the compressor system needs to be locked or shut down, the protection module sends a compressor instruction to the protection relay to disconnect the power supply circuit of the compressor.

[0019] In one embodiment, the injection enthalpy increase branch includes an economizer or a flash tank disposed between the condenser and the evaporator.

[0020] The protection module is installed in a junction box on the compressor housing, or in a control box of the compressor system.

[0021] Another aspect of the present invention is to provide a control method for a compressor system, the compressor system comprising a compressor, a condenser, an evaporator and an alarm device. The control method comprises: when the compressor system is powered on, collecting operating parameters of the compressor system; judging whether the compressor system has a fault according to the collected operating parameters; and when it is judged that the compressor system has a fault and the compressor of the compressor system needs to be locked or shut down, issuing a compressor instruction to lock or shut down the compressor. The control method also comprises, after issuing the compressor instruction, further judging whether the compressor is in forced operation, and when it is judged that the compressor is in forced operation, starting the alarm device to issue an alarm.

[0022] The compressor system also includes an injection enthalpy increase branch. The control method also includes: when it is determined that the compressor is in forced operation after the compressor instruction is issued, the injection enthalpy increase branch is enabled to provide injection enthalpy increase injection.

[0023] The present invention provides an improved protection module, a compressor, a compressor system and a control method for a compressor system. After the present invention detects a fault in the compressor system and issues an instruction to shut down or lock the compressor, it further determines whether the compressor is in forced operation, and when the compressor is in forced operation, the protection module continues to operate, continues to control the controlled components of the compressor system based on the operating parameters, continues to provide protection control, reminds relevant personnel to eliminate the fault as soon as possible, and avoids high-temperature carbonization of the lubricating oil of the compressor when the compressor is in forced operation, which causes the compressor to fail quickly, thereby protecting the compressor to the maximum extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Embodiments of the present invention will be described below by way of example only with reference to the accompanying drawings. In the accompanying drawings, the same features or components are indicated by the same reference numerals, and the drawings are not necessarily drawn to scale, and in the accompanying drawings:

[0025] Figure 1 A schematic block diagram of a compressor system according to one embodiment of the present invention is shown;

[0026] Figure 2 A schematic block diagram of a protection module according to an embodiment of the present invention is shown; and

[0027] Figure 3 A control flow chart of a protection module according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0028] The following description is merely exemplary in nature and is not intended to limit the present invention, its application and use. It should be understood that in all of the accompanying drawings, similar reference numerals indicate the same or similar parts and features. The various drawings only schematically represent the concepts and principles of the embodiments of the present invention, and do not necessarily show the specific dimensions and proportions of the various embodiments of the present invention. Specific parts in specific drawings may be exaggerated to illustrate the relevant details or structures of the embodiments of the present invention.

[0029] In the description of the embodiments of the present invention, the directional terms related to "upper", "lower", "left", and "right" are used to describe the upper, lower, left, and right positions of the views shown in the accompanying drawings. In practical applications, the positional relationships of "upper", "lower", "left", and "right" used in this document can be defined according to actual conditions, and these relationships can be reversed.

[0030] Figure 1 1 shows a schematic block diagram of a compressor system according to one embodiment of the present invention, showing the flow of a working fluid (refrigerant) within the compressor system 100. Figure 1 As shown, the compressor system 100 includes a compressor 1, a condenser 2, a throttle valve 3, and an evaporator 4. In the compressor system 100, the pipeline connecting the compressor 1, the condenser 2, the throttle valve 3, and the evaporator 4 constitutes the main flow pipeline of the refrigerant. In addition, in the example shown in the figure, the compressor system 100 is also provided with an injection enthalpy increase (EVI) branch, and an economizer or flash tank connected between the condenser 2 and the evaporator 4 (more particularly, connected between the condenser 2 and the throttle valve 3) is correspondingly provided. In one example, an economizer configured as a plate heat exchanger 5 is provided. The compressor 1 is provided with an air inlet 11, an exhaust port 12, and an EVI port 13. One end of the EVI branch is connected to the outlet pipeline of the condenser 2, and the other end is connected to the EVI port 13 of the compressor 1, and an electronic expansion valve 6, a plate heat exchanger 5, and a solenoid valve 7 are connected therebetween. In the example shown in the figure, a solenoid valve 7 is shown. However, it should be noted that the solenoid valve 7 is not necessary. In other examples according to the present invention, the solenoid valve 7 may not be provided. The EVI branch can provide gaseous refrigerant to the compression chamber of the compression mechanism of the compressor 1 to increase the mass flow of the compressed refrigerant, thereby increasing the cooling capacity / heating capacity and improving the system energy efficiency ratio. In addition, the EVI branch can also provide liquid refrigerant to the compressor 1 to cool the compression mechanism and thus reduce the exhaust temperature of the compression mechanism.

[0031] The air inlet 11 is connected to the outlet of the evaporator 4, and the air outlet 12 is connected to the inlet of the condenser 2. A portion of the liquid refrigerant flowing out of the condenser 2 flows into the plate heat exchanger 5 through the pipeline L1. Another portion of the liquid refrigerant flowing out of the condenser 2 flows into the pipeline L2 of the EVI branch, flows through the electronic expansion valve 6 and flows into the plate heat exchanger 5. After heat exchange in the plate heat exchanger 5, the liquid refrigerant flowing into the plate heat exchanger 5 through the pipeline L1 flows to the pipeline L3, and flows into the evaporator 4 through the throttle valve 3; and the refrigerant flowing into the EVI branch flows into the pipeline L4 of the EVI branch after absorbing heat in the plate heat exchanger 5, flows through the solenoid valve 7, flows into the EVI port 13 of the compressor 1 and enters the compressor 1. In the embodiment shown above, the EVI branch of the compressor system 100 is implemented based on the plate heat exchanger 5. However, the present invention is not limited thereto, and in other examples according to the present invention, as described above, the EVI branch of the compressor system 100 may also be implemented based on other economizers or flash tanks.

[0032] The compressor system 100 is also provided with a protection module 20. The protection module 20 is configured to monitor the operating status of the compressor system 100, and control the related controlled components of the compressor system 100 according to the monitoring data, control the operation of the compressor 1, and provide various protection functions for the compressor 1, such as AC input protection function, overheating protection function, EVI control function, etc., to ensure the performance reliability of the compressor 1 and the compressor system 100. The protection module 20 is in the form of an integrated circuit board. Figure 1 In the example shown, the protection module 20 is installed in a terminal box (not shown) on the housing of the compressor 1. However, the present invention is not limited thereto, and in other examples according to the present invention, the protection module may also be installed in a control box (not shown) of a unit of the compressor system 100.

[0033] Figure 2 FIG. 2 shows a schematic block diagram of the protection module 20. Figure 2 As shown, the protection module 20 includes a data acquisition unit 21 , a setting unit 22 , a storage unit 23 and a control unit 24 .

[0034] The data acquisition unit 21 is configured to collect operating parameters of the compressor system 100 to monitor the operating state of the compressor system 100. The data acquisition unit 21 includes a plurality of acquisition ports, for example, an exhaust signal acquisition port 211, an injection signal acquisition port 212, and an AC input signal acquisition port 213, which are respectively connected to sensors installed inside the compressor 1 and other parts of the compressor system 100 to obtain operating parameters measured by each sensor. The operating parameters acquired by the data acquisition unit 21 include the compressor exhaust temperature, the inlet and outlet temperatures of the plate heat exchanger, the AC input signal of the power supply circuit of the compressor motor, and the like.

[0035] The exhaust signal acquisition port 211 can be connected to an exhaust temperature sensor (e.g., a compressor exhaust pipe temperature sensor and / or a compression mechanism exhaust port temperature sensor) to collect the compressor exhaust temperature (e.g., the temperature of the gas discharged from the exhaust pipe of the compressor and / or the temperature of the gas discharged from the compression mechanism of the compressor) and the circuit connection status of the exhaust temperature sensor. The jet signal acquisition port 212 can be connected to the inlet and outlet sensors of the plate heat exchanger 5 to collect the inlet and outlet jet temperatures of the plate heat exchanger 5 and the circuit connection status of the inlet and outlet sensors of the plate heat exchanger 5. The AC input signal acquisition port 213 can be connected to the power supply circuit of the compressor motor to collect the AC input signal of the power supply circuit of the compressor motor. Figure 2 , the exhaust signal acquisition port 211, the jet signal acquisition port 212, and the AC input signal acquisition port 213 are schematically shown. However, the present invention is not limited thereto, and in other examples according to the present invention, the data acquisition unit 21 may also be provided with other acquisition ports to collect other operating parameters.

[0036] The setting unit 22 is configured to set the thresholds of the operating parameters and the function settings of the protection module 20. The setting unit 22 can be operated to set the operating parameters of the compressor system 100, for example, to set the thresholds of the compressor exhaust temperature and the thresholds of the inlet and outlet jet temperatures of the plate heat exchanger. In addition, the setting unit 22 can also be operated to turn on or off the control items of the protection module 20, for example, to turn on or off the compressor jet control.

[0037] The storage 23 is used to store the threshold values ​​of various operating parameters set by the setting unit 22, and store the measured values ​​of various operating parameters during the operation of the compressor system 100 and the control records performed by the protection module 20, such as EVI injection control, AC input control, etc.

[0038] The control unit 24 can receive the operating parameters collected by the data acquisition unit 21, and compare them with the corresponding threshold values ​​stored in the storage 23, determine the operating state of the compressor system 100, determine whether the compressor system 100 has a fault, and perform corresponding control. The control unit 24 includes a plurality of control ports, which are electrically connected to the corresponding controlled devices of the compressor system 100 respectively to perform corresponding control. For example, the control ports of the control unit 24 may include a power supply control port 241, an injection enthalpy (EVI) control port 242, an alarm control port 243, and a throttling control port 244. For example, the controlled devices of the compressor system 100 may include a protection relay (not shown in the figure), a control valve of the EVI branch (for example, an electronic expansion valve 6 and / or a solenoid valve 7), other throttling valves in the coolant pipeline (for example, a throttling valve 3), an alarm device, a switch, etc. When the EVI branch includes an electronic expansion valve 6 and a solenoid valve 7, the control valve of the EVI branch controlled by the control unit 24 may be either or both of the electronic expansion valve 6 and the solenoid valve 7, and when the EVI branch does not include the solenoid valve 7, the control valve is the electronic expansion valve 6. An alarm device (not shown in the figure) communicates with the control unit 24, and is configured to be activated upon receiving an alarm instruction issued by the control unit 24, so as to sound an alarm, prompt fault information, and remind relevant personnel (e.g., users or maintenance personnel) to check, so that relevant personnel can quickly and accurately determine the cause of the fault so as to quickly troubleshoot the fault. The alarm device may use an alarm indicator light or an alarm buzzer and a display screen (e.g., an LED display screen), and may be constructed as an interactive device. The alarm device may be installed on the protection module 20, or may be installed at other locations that are easily accessible to users or maintenance personnel.

[0039] The power supply control port 241 can be connected to the protection relay or system control circuit of the compressor, for example, to disconnect the power supply circuit of the compressor motor and provide AC input protection (for example, AC input phase loss protection, phase error protection, voltage protection). The EVI control port 242 can be connected to the control valve of the EVI branch (for example, the electronic expansion valve 6 and / or the solenoid valve 7) to control the EVI injection and provide the EVI control function. For example, the EVI control port 242 can be connected to the electronic expansion valve 6, such as Figure 1 As shown by the dotted line in FIG. 24. The alarm control port 243 can be connected to an alarm device to control the start and stop of the alarm device. The throttle control port 244 can be connected to a throttle valve 3 in the coolant main line to adjust the superheat. Figure 2 , schematically shows a power supply control port 241, an EVI control port 242, an alarm control port 243, and a throttling control port 244. However, as mentioned above, this is only an example, and the present invention is not limited thereto. In other examples according to the present invention, the control unit 24 may be provided with more control ports to provide other protection control functions.

[0040] Figure 3 A control flow chart of the protection module 20 according to the present invention is shown.

[0041] like Figure 3 As shown, in step 201, the compressor 1 is powered on, the compressor 1 starts to run, and accordingly, the protection module 20 detects the AC input of the compressor 1 and starts to run. In step 202, the protection module 20 monitors the operating state of the compressor system 100. Specifically, the data acquisition unit 21 collects the operating parameters of the compressor system 100, and the control unit 24 determines the operating state of the compressor system 100 according to the operating parameters collected by the data acquisition unit 21 and the corresponding thresholds and control records in the storage 23.

[0042] In step 203, the control unit 24 determines whether a fault is detected. Faults include, for example, frequent compressor startup, compressor exhaust overheating and / or motor overheating, exhaust temperature sensor open circuit or short circuit, AC input phase loss, phase mismatch, overvoltage and / or undervoltage, inlet and outlet jet temperatures of the plate heat exchanger exceeding the range, inlet and outlet sensors of the plate heat exchanger open circuit or short circuit, etc.

[0043] If a fault is detected in the compressor system, then in step 204, the control unit 24 further determines whether the current fault requires the compressor 1 to be locked or shut down. The situations where the compressor 1 needs to be locked or shut down include but are not limited to: the data collected by the exhaust signal acquisition port 211 of the data acquisition unit 21 shows that the compressor exhaust is overheated and / or the motor is overheated, and / or the exhaust temperature sensor is open or short-circuited; the data collected by the AC input signal acquisition port 213 of the data acquisition unit 21 shows that the AC input is missing phase, misphase, overvoltage and / or undervoltage. If the current fault does not require the compressor 1 to be shut down or locked, for example, when the information collected by the jet signal acquisition port 212 shows that the inlet and outlet jet temperatures of the plate heat exchanger 5 are out of range or the inlet and outlet sensors of the plate heat exchanger 5 are open or short-circuited, then in step 205, the control unit 24 issues a first alarm instruction through the alarm control port 243, starts the alarm device, issues an alarm, displays the current fault information, and reminds the user or maintenance personnel to check the system. After noticing the alarm, the user or maintenance personnel can troubleshoot the fault according to the displayed fault information. It should be noted that step 205 is not necessary. Figure 3Step 205 is shown with a dotted line. In other examples according to the present invention, when a fault is detected but the compressor does not need to be shut down or locked, no alarm may be issued. If the current fault requires the compressor 1 to be shut down or locked, then in step 206, the control unit 24 issues a compressor command to lock or shut down the compressor. For example, the compressor command may be a power-off command issued via the power supply control port 241 to disconnect the power supply circuit of the compressor motor. After receiving the power-off command, the protection relay or the system control circuit disconnects the power supply circuit of the compressor motor.

[0044] Next, in step 207, the control unit 24 determines whether the compressor 1 is in forced operation. In this step, the control unit 24 determines the current of the power supply circuit of the compressor based on the AC input signal of the power supply circuit collected by the AC input signal collection port 213 of the data collection unit 21, thereby determining whether the compressor 1 is in forced operation. If the data collected by the AC input signal collection port 213 shows that there is current in the power supply circuit of the compressor, it is determined that the power supply circuit of the compressor 1 is not disconnected, and the compressor 1 is in forced operation. If the data collected by the AC input signal collection port 213 shows that there is no current in the power supply circuit of the compressor, it is determined that the power supply circuit of the compressor 1 has been disconnected, and the compressor has been locked or stopped. The reasons for the forced operation of the compressor 1 include but are not limited to: the switch contacts in the three-phase AC input circuit of the power supply circuit of the compressor are adhered; the power supply control port 241 is short-circuited; or the power supply control port 241 is mistakenly bypassed by the control loop. In addition, since the storage 23 stores historical operation data and historical control records of the compressor system 100, the control unit 24 can determine whether the compressor is forced to operate by accessing the historical operation data and historical control records stored in the storage 23. For example, when the historical operation data and historical control records stored in the storage 23 show that the AC input information within a predetermined time after the compressor command to lock or stop the compressor is issued shows that there is current in the power supply circuit of the compressor, it can be determined that the compressor is forced to operate.

[0045] If it is determined that the compressor 1 is in forced operation, then in step 208, the control unit 24 issues a second alarm instruction through the alarm control port 243 to start the alarm device, sound an alarm, display the current fault information, and remind the user or maintenance personnel to check the system. In addition, in the case where the compressor 1 is provided with an EVI module and the protection module 20 is integrated with the EVI control, in step 209, the control unit 24 also enables the EVI branch to continue to provide EVI injection. Specifically, the control unit 24 first determines whether the EVI branch is closed, for example, by detecting the open and closed state of the control valve (electronic expansion valve 6 and / or solenoid valve 7) of the EVI branch to determine whether the EVI branch is closed. If it is determined that the EVI branch is still running and has not been closed at this time, the control unit 24 allows the EVI branch to continue to operate, for example, the injection enthalpy control port 242 of the control unit 24 keeps the control valve of the EVI branch open to continue to provide EVI injection. If it is determined that the EVI branch is closed at this time, the control unit 24 issues an injection enthalpy increase instruction through the EVI control port 242 to restart the control valve (electronic expansion valve 6 and / or solenoid valve 7) of the EVI branch, thereby enabling the EVI branch to continue to provide EVI injection. In this way, the exhaust temperature can be lowered when the compressor 1 is forced to run, thereby preventing the lubricating oil of the compressor 1 from carbonizing at high temperature and causing the compressor 1 to fail quickly. In this case, preferably, the control unit 24 also continues to provide other protection controls. For example, it can continue to provide overheat protection, so that even when the compressor 1 is forced to run, the compressor 1 can be protected to the maximum extent. It should be noted here that step 209 is not necessary, so in Figure 3 Step 209 is shown by a dotted line. As described above, when the compressor 1 is provided with an EVI module and the protection module 20 is integrated with the EVI control, the control unit 24 enables the EVI branch only when the compressor is forced to run, and only when the EVI branch is closed at this time, the control unit 24 issues an injection enthalpy increase instruction to restart the control valve of the EVI branch, thereby enabling the EVI branch.

[0046] If it is determined in step 207 that the compressor 1 has been locked or stopped without forced operation, then in step 210, the control unit 24 issues a third alarm instruction via the alarm control port 243, activates the alarm device, issues an alarm, and displays the current fault information. Since a fault has been detected and the power supply circuit of the compressor motor has been disconnected, the protection module 20 stops running and the control unit 24 stops various protection controls in step 211. In the case where the compressor 1 is provided with an EVI module and the protection module 20 is integrated with the EVI control, the EVI function module is also turned off and the EVI injection is stopped.

[0047] It should be noted that the first alarm instruction issued in step 205, the second alarm instruction issued in step 208, and the third alarm instruction issued in step 210 may be different from each other, so as to issue different alarms and prompt corresponding fault information, for example, the color and / or flashing frequency of the alarm indicator light, the volume of the alarm buzzer, and / or the information content displayed on the display screen may be different. Moreover, in a modified example according to the present invention, the protection module may issue an alarm only when it is determined that there is a fault in the compressor system and the compressor continues to operate, but not in other cases. That is, it is only determined that the second alarm instruction is issued in the above step 208 when the compressor is forced to operate, and steps 205 and 210 are not executed.

[0048] Then, after noticing the alarm issued by the protection module, the user or maintenance personnel can eliminate the fault in a targeted manner according to the alarm issued and the displayed fault information. In the case of forced operation of the compressor, in order to end the forced operation as soon as possible, the user or maintenance personnel can manually shut down the compressor 1 before troubleshooting, for example, unplug the AC plug of the compressor system 100. After the fault is eliminated, the compressor 1 can be powered on again, and the protection module 20 starts to operate accordingly, continues to monitor the operating status of the compressor 1, and repeats the above control process.

[0049] The above describes a protection module according to an embodiment of the present invention, a compressor having the protection module, a compressor system, and a control method for the compressor system. In the present invention, the protection module can provide AC input protection, overheat protection, and also integrates an EVI control function, can monitor the forced operation of the compressor, and can issue an alarm when the forced operation of the compressor is detected, reminding the user to check, and allowing the protection module to continue to provide protection control, thereby reducing the possibility of compressor failure.

[0050] Here, exemplary embodiments of the present invention have been described in detail, but it should be understood that the present invention is not limited to the specific embodiments described and shown in detail above. Without departing from the spirit and scope of the present invention, those skilled in the art can make various modifications and variations to the present invention. All these modifications and variations fall within the scope of the present invention. Moreover, all components described herein can be replaced by other technically equivalent components.

Claims

1. A protection module, the protection module being connected to a compressor system, the protection module comprising: A data acquisition unit, the data acquisition unit is configured to collect operating parameters of the compressor system; as well as a control unit, the control unit being configured to receive the operating parameters collected by the data collection unit, and judging whether the compressor system has a fault based on the operating parameters, the control unit comprising an alarm control port, wherein when the control unit judges that the compressor system has a fault and needs to lock or shut down the compressor of the compressor system, the control unit issues a compressor instruction to lock or shut down the compressor, It is characterized in that after issuing the compressor instruction, the control unit further determines whether the compressor is in forced operation, and when it is determined that the compressor is in forced operation, the control unit issues an alarm instruction through the alarm control port.

2. The protection module according to claim 1, wherein: The compressor system includes an injection enthalpy increase branch; and The control unit further includes an injection enthalpy increase control port, wherein when the control unit determines that the compressor is in forced operation, the control unit enables the injection enthalpy increase branch through the injection enthalpy increase control port.

3. The protection module according to claim 1 or 2, wherein: The data acquisition unit includes an AC input signal acquisition port, and the AC input signal acquisition port is configured to acquire an AC input signal of a power supply circuit of the compressor; When the AC input signal collected by the AC input signal collection port shows that the AC input is missing phase, misphase, overvoltage and / or undervoltage, the control unit determines that the compressor needs to be locked or shut down.

4. The protection module according to claim 1 or 2, wherein: The data acquisition unit includes an exhaust signal acquisition port, and the exhaust signal acquisition port is configured to acquire the compressor exhaust temperature and / or the circuit connection status of the compressor exhaust temperature sensor; as well as When the data collected by the exhaust signal collection port shows that the compressor exhaust temperature is too high and / or the circuit connection of the compressor exhaust temperature sensor is short-circuited or open-circuited, the control unit determines that the compressor needs to be locked or shut down.

5. The protection module according to claim 1 or 2, wherein: The protection module further comprises a power supply control port, and the compressor instruction is a power-off instruction issued through the power supply control port to cut off the power supply circuit of the compressor; The data acquisition unit includes an AC input signal acquisition port, and the AC input signal acquisition port is configured to acquire an AC input signal of a power supply circuit of the compressor; as well as Wherein, after the control unit issues the compressor instruction, the control unit determines the current of the power supply circuit of the compressor according to the AC input signal collected by the AC input signal collection port to determine whether the compressor is in forced operation.

6. The protection module according to claim 1 or 2, wherein: The protection module further includes a storage device, wherein the storage device stores the threshold value of the operating parameter, and stores the collected operating parameter and the control record executed by the protection module. After the control unit issues the compressor instruction, the control unit accesses the operating parameters and control records stored in the memory to determine whether the compressor is in forced operation.

7. A compressor, characterized in that: The compressor is protected using the protection module according to any one of claims 1-6.

8. A compressor system, comprising: compressor; a condenser connected to an exhaust port of the compressor; an evaporator connected to an air inlet of the compressor; as well as Alarm devices, It is characterized in that the compressor system also includes a protection module according to any one of claims 1-6, the alarm control port of the protection module is connected to the alarm device, and the protection module is configured to send an alarm instruction to the alarm device via the alarm control port to activate the alarm device to sound an alarm.

9. The compressor system according to claim 8, wherein: The compressor system further comprises an injection enthalpy increase branch, wherein the injection enthalpy increase branch is connected to an injection enthalpy increase port of the compressor; When the protection module determines that the compressor is in forced operation, the protection module enables the injection enthalpy increase branch to provide injection enthalpy increase injection.

10. The compressor system according to claim 8, wherein: The compressor system also includes a protection relay; When the protection module determines that a fault exists in the compressor system and the compressor of the compressor system needs to be locked or shut down, the protection module sends the compressor instruction to the protection relay to disconnect the power supply circuit of the compressor.

11. The compressor system according to claim 9, wherein: The injection enthalpy increase branch includes an economizer or a flash tank arranged between the condenser and the evaporator.

12. The compressor system according to any one of claims 8 to 11, wherein: The protection module is installed in a junction box on the housing of the compressor, or in a control box of the compressor system.

13. A method for controlling a compressor system, the compressor system comprising a compressor, a condenser, an evaporator and an alarm device, The control method comprises: When the compressor system is powered on, collecting operating parameters of the compressor system; Determining whether the compressor system has a fault according to the collected operating parameters; as well as When it is determined that the compressor system has a fault and it is determined that the compressor of the compressor system needs to be locked or stopped, a compressor command for locking or stopping the compressor is issued, Characteristically, the control method further comprises: after issuing the compressor instruction, further determining whether the compressor is in forced operation, and when it is determined that the compressor is in forced operation, starting the alarm device to sound an alarm.

14. The control method of the compressor system according to claim 13, wherein: The compressor system further comprises an injection enthalpy increase branch, Wherein, the control method further comprises: when it is determined that the compressor is in forced operation after the compressor instruction is issued, enabling the jet enthalpy increase branch to provide jet enthalpy increase injection.

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