A fusible plug protection control method, device and unit

Abstract

The present invention discloses a fusible plug protection control method, device and unit. The method includes: when the unit is running, monitoring the temperature of the refrigerant flowing to the fusible plug; judging the range of the refrigerant temperature; if the refrigerant temperature is greater than or equal to the first preset temperature and less than or equal to the second preset temperature, reducing the frequency of the compressor according to the current indoor temperature. During the operation of the unit, when the present invention monitors that the temperature of the refrigerant flowing to the fusible plug is greater than or equal to the first preset temperature and less than or equal to the second preset temperature, the compressor is reduced in frequency according to the current indoor temperature to reduce the refrigerant temperature, prevent the fusible plug from melting and failing, protect the fusible plug, avoid the problem of inconvenience in maintenance and increased maintenance costs caused by the melting of the fusible plug, maintain the normal operation of the unit, protect the unit, reduce the later maintenance of the unit, reduce maintenance costs, and improve after-sales maintenance efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of units, and in particular to a fusible plug protection control method, device and unit. Background Art

[0002] The fusible plug in the unit is the last line of protection. When the refrigeration system is working, if the pressure in the oil separator suddenly increases, the temperature of the refrigerant will also increase. When the temperature rises to the melting point of the fusible alloy, the fusible alloy will melt immediately, forming a gap. The refrigerant in the oil separator is released into the atmosphere, achieving pressure relief, thereby protecting the safety of people and equipment.

[0003] However, after the fusible plug melts, it needs to be recast with fusible alloy and tested for leaks before it can be used again. Generally, replacement is adopted during the maintenance process, which increases the maintenance cost. In addition, some units have narrow space and it is inconvenient to replace the internal components of the equipment, resulting in low after-sales maintenance efficiency.

[0004] With respect to the problem in the prior art that the melting of the fusible plug of the unit causes inconvenience in maintenance and increases maintenance costs, no effective solution has been proposed so far. Summary of the Invention

[0005] The embodiments of the present invention provide a fusible plug protection control method, device and unit, so as to at least solve the problem in the prior art that the melting of the fusible plug of the unit causes inconvenience in maintenance and increases maintenance costs.

[0006] To solve the above technical problems, an embodiment of the present invention provides a fusible plug protection control method, comprising:

[0007] When the unit is running, monitor the temperature of the refrigerant flowing to the fusible plug;

[0008] Determining the range of the refrigerant temperature;

[0009] If the refrigerant temperature is greater than or equal to the first preset temperature and less than or equal to the second preset temperature, the compressor is frequency-reduced according to the current indoor temperature.

[0010] Optionally, reduce the compressor frequency based on the current indoor temperature, including:

[0011] If the current indoor temperature reaches the set temperature, controlling the frequency of the compressor to decrease to a first frequency;

[0012] If the current indoor temperature does not reach the set temperature, controlling the frequency of the compressor to decrease to a second frequency;

[0013] The second frequency is greater than the first frequency.

[0014] Optionally, after determining the range of the refrigerant temperature, the method further includes:

[0015] If the refrigerant temperature is lower than the first preset temperature, the unit is controlled to operate normally according to the current working mode;

[0016] If the refrigerant temperature is greater than the second preset temperature, a first prompt message is output, and the unit is controlled to stop running after a first preset time.

[0017] Optionally, after monitoring the temperature of the refrigerant flowing to the fusible plug, it also includes: if it is monitored that the change value of the refrigerant temperature within the second preset time is greater than a preset threshold, a second prompt message is output, and the unit is controlled to stop running after a third preset time.

[0018] Optionally, while reducing the frequency of the compressor according to the current indoor temperature, the following steps are also included:

[0019] Determine the target speed according to the condensing temperature corresponding to the current high pressure, and increase the speed of the external fan to the target speed; or,

[0020] Directly increase the rotation speed of the external fan to the maximum rotation speed.

[0021] Optionally, the second preset temperature is lower than the melting point of the fusible alloy.

[0022] An embodiment of the present invention further provides a fusible plug protection control device, comprising:

[0023] A monitoring module is used to monitor the temperature of the refrigerant flowing to the fusible plug when the unit is running;

[0024] A judgment module, used to judge the range of the refrigerant temperature;

[0025] The control module is configured to reduce the frequency of the compressor according to the current indoor temperature if the refrigerant temperature is greater than or equal to the first preset temperature and less than or equal to the second preset temperature.

[0026] An embodiment of the present invention further provides a unit, comprising: the fusible plug protection control device described in the embodiment of the present invention.

[0027] An embodiment of the present invention further provides a computer device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method described in the embodiment of the present invention when executing the computer program.

[0028] An embodiment of the present invention further provides a non-volatile computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the method described in the embodiment of the present invention are implemented.

[0029] By applying the technical solution of the present invention, during the operation of the unit, when it is monitored that the temperature of the refrigerant flowing to the fusible plug is greater than or equal to the first preset temperature and less than or equal to the second preset temperature, the compressor is reduced in frequency according to the current indoor temperature to reduce the refrigerant temperature, prevent the fusible plug from melting and failing, protect the fusible plug, avoid the problem of maintenance inconvenience and increased maintenance costs caused by the melting of the fusible plug, maintain the normal operation of the unit, protect the unit, reduce the later maintenance of the unit, reduce maintenance costs, and improve after-sales maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a flow chart of a fusible plug protection control method provided in Example 1 of the present invention;

[0031] Figure 2 This is a schematic diagram of the fusible plug protection control flow provided in the second embodiment of the present invention;

[0032] Figure 3 This is a structural block diagram of the fusible plug protection control device provided in the third embodiment of the present invention. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings. It is apparent that the embodiments described are only some, not all, of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first", "second", etc. in the description, claims, and drawings of the present invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way are interchangeable where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or that are inherent to these processes, methods, products, or apparatus.

[0035] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0036] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0037] Example 1

[0038] This embodiment provides a fusible plug protection control method. Figure 1 This is a flow chart of the fusible plug protection control method provided in the first embodiment of the present invention. Figure 1 As shown, the method includes the following steps:

[0039] S101, when the unit is running, monitor the temperature of the refrigerant flowing to the fusible plug.

[0040] S102: Determine the range of the refrigerant temperature.

[0041] S103: If the refrigerant temperature is greater than or equal to the first preset temperature and less than or equal to the second preset temperature, reduce the frequency of the compressor according to the current indoor temperature.

[0042] Specifically, a high-precision temperature sensor can be provided on the connecting pipe of the fusible plug to monitor the temperature of the refrigerant flowing to the fusible plug. For example, the temperature sensor can be installed 30±5 mm in front of the fusible plug along the refrigerant flow direction.

[0043] The first preset temperature and the second preset temperature can be preset according to actual conditions, wherein the first preset temperature is lower than the second preset temperature, and the second preset temperature is lower than the melting point of the fusible alloy. For example, the first preset temperature is set to 60° C. and the second preset temperature is set to 70° C.

[0044] In this embodiment, during the operation of the unit, when it is monitored that the temperature of the refrigerant flowing to the fusible plug is greater than or equal to the first preset temperature and less than or equal to the second preset temperature, the compressor is reduced in frequency according to the current indoor temperature to reduce the refrigerant temperature, prevent the fusible plug from melting and failing, protect the fusible plug, avoid the problem of maintenance inconvenience and increased maintenance costs caused by the melting of the fusible plug, maintain the normal operation of the unit, protect the unit, reduce the later maintenance of the unit, reduce maintenance costs, and improve after-sales maintenance efficiency.

[0045] In one embodiment, reducing the compressor frequency based on the current indoor temperature includes: if the current indoor temperature reaches a set temperature, controlling the compressor frequency to be reduced to a first frequency; if the current indoor temperature does not reach the set temperature, controlling the compressor frequency to be reduced to a second frequency. The second frequency is greater than the first frequency. The first and second frequencies can be pre-set based on actual conditions, for example, the first frequency can be set to 30 Hz and the second frequency to 40 Hz. The set temperature refers to the target temperature set by the user.

[0046] This embodiment performs frequency reduction control according to different situations based on the current indoor temperature. When the current indoor temperature does not reach the set temperature, the compressor frequency is prevented from dropping too low and affecting the indoor temperature, ensuring that the user's temperature control needs are taken into account while protecting the fusible plug.

[0047] After determining the range of the refrigerant temperature, it also includes: if the refrigerant temperature is lower than the first preset temperature, the unit is controlled to operate normally according to the current working mode; if the refrigerant temperature is higher than the second preset temperature, a first prompt message is output, and the unit is controlled to stop operating after a first preset time.

[0048] The unit's operating modes include cooling mode, heating mode, dehumidification mode, and ventilation mode. The first prompt message is used to inform the user that the refrigerant temperature flowing to the fusible plug is too high. The first prompt message can be output via at least one of the following: display, voice, and lighting. The first preset time can be preset based on actual conditions, for example, to 3 minutes.

[0049] In this embodiment, when the temperature of the refrigerant flowing to the fusible plug is too high, the unit can be promptly controlled to shut down, thereby achieving the purpose of protecting the fusible plug and the unit.

[0050] After reducing the frequency of the compressor according to the current indoor temperature, continue to monitor the temperature of the refrigerant flowing to the fusible plug. If the refrigerant temperature drops below the first preset temperature, the unit can operate normally. If the refrigerant temperature continues to rise above the second preset temperature, a prompt will be given and the unit will be controlled to shut down. If the refrigerant temperature is still greater than or equal to the first preset temperature and less than or equal to the second preset temperature, continue monitoring.

[0051] In one embodiment, after monitoring the refrigerant temperature flowing to the fusible plug, it also includes: if it is monitored that the change value of the refrigerant temperature within the second preset time is greater than the preset threshold, a second prompt message is output, and the unit is controlled to stop running after a third preset time.

[0052] The second preset time and the third preset time can be preset based on actual conditions, for example, the second preset time can be set to 10 minutes and the third preset time can be set to 5 seconds. The preset threshold can be preset based on actual conditions, for example, the preset threshold can be set to 10°C. The second prompt message is used to notify the user of an abnormal change in the refrigerant temperature flowing to the fusible plug. The second prompt message can be output via at least one of the following: display, voice, and lighting.

[0053] In this embodiment, when a sharp change in the temperature of the refrigerant flowing to the fusible plug is detected, the unit is promptly controlled to shut down, thereby achieving the purpose of protecting the fusible plug and protecting the unit.

[0054] In actual applications, a certain duration can be set. When the continuous preset time meets the temperature condition, the corresponding operation is performed to ensure the reliability of the control. For example, if the continuous preset time meets the condition that the refrigerant temperature is greater than or equal to the first preset temperature and less than or equal to the second preset temperature, the compressor is reduced in frequency according to the current indoor temperature; if the continuous preset time meets the condition that the refrigerant temperature is less than the first preset temperature, the unit is controlled to operate normally according to the current working mode; if the continuous preset time meets the condition that the refrigerant temperature is greater than the second preset temperature, the first prompt information is output, and the unit is controlled to stop running after the first preset time.

[0055] In addition to reducing the compressor frequency, the refrigerant temperature can also be lowered by increasing the speed of the unit's external fan. Specifically, while reducing the frequency of the compressor according to the current indoor temperature, it also includes: determining the target speed based on the condensing temperature corresponding to the current high pressure, and increasing the speed of the external fan to the target speed; or directly increasing the speed of the external fan to the maximum speed.

[0056] Specifically, a pre-set relationship between condensing temperature and external fan speed can be used. The target external fan speed is then determined based on the condensing temperature corresponding to the current high-pressure pressure, thereby increasing the external fan speed. The higher the condensing temperature and the greater the high-pressure pressure, the higher the corresponding external fan speed. Increasing the external fan speed can accelerate heat dissipation and cool the entire unit.

[0057] This embodiment can rapidly cool down the unit by reducing the compressor frequency and increasing the external fan speed, thereby rapidly reducing the temperature of the refrigerant flowing to the fusible plug.

[0058] Example 2

[0059] The following describes the above-mentioned fusible plug protection control method with reference to a specific embodiment. However, it should be noted that this specific embodiment is only intended to better illustrate the present application and does not constitute an undue limitation of the present application. Explanations of terms that are the same or corresponding to those in the above-mentioned embodiment will not be repeated in this embodiment.

[0060] like Figure 2 As shown in the figure, the fusible plug protection control process includes the following steps:

[0061] S201, start.

[0062] S202 , monitoring the temperature T of the refrigerant flowing to the fusible plug through a temperature sensor on the fusible plug connecting pipe.

[0063] S203, determine whether T<T1 is satisfied, if not, proceed to S204, if so, proceed to S206.

[0064] S204, determine whether T>T2 is satisfied, if not, proceed to S205, if so, proceed to S207.

[0065] S205, the unit enters the fusible plug temperature control process, and the main board controls the compressor frequency and external fan speed.

[0066] Taking a cold storage as an example, if the storage temperature reaches the set temperature t0, the compressor frequency is reduced to F1, and the external fan speed is increased (or directly increased to the maximum speed) based on the current high pressure to quickly cool the unit. If the storage temperature does not reach the set temperature t0, the compressor frequency is reduced to F2, and the external fan speed is increased (or directly increased to the maximum speed) based on the current high pressure to quickly cool the unit.

[0067] During the cooling process, the temperature T is continuously monitored. For example, whether the current temperature T is still within the range of [T1, T2] is detected every minute. If T stabilizes below T1, the fusible plug temperature control process is exited and normal operation is entered. If T is greater than T2, the temperature sensor temperature is too high, which is displayed on the display panel, and the system is shut down after 3 minutes.

[0068] S206, the unit is in normal operation.

[0069] S207, issues a temperature abnormality warning and controls the unit to stop running after 3 minutes.

[0070] When the temperature sensor detects a rapid temperature change within 10 minutes, for example, the temperature change value △T>10℃, the temperature sensor temperature change abnormality will be displayed on the display panel as an alarm, and the machine will shut down after 5 seconds.

[0071] T1 represents a first preset temperature, T2 represents a second preset temperature, F1 represents a first frequency, and F2 represents a second frequency.

[0072] In this embodiment, a temperature sensor is provided on the connecting pipe of the fusible plug to monitor the temperature of the refrigerant flowing to the fusible plug. When the refrigerant temperature is within a preset range (i.e., greater than or equal to the first preset temperature and less than or equal to the second preset temperature), the unit is controlled to quickly reduce the frequency to reduce the refrigerant temperature; when the refrigerant temperature changes sharply, the unit is controlled to shut down, thereby achieving the purpose of protecting the fusible plug and the unit, and avoiding maintenance inconvenience and increased maintenance costs due to the melting of the fusible plug.

[0073] Example 3

[0074] Based on the same inventive concept, this embodiment provides a fusible plug protection control device that can be used to implement the fusible plug protection control method described in the above embodiment. The device can be implemented through software and / or hardware.

[0075] Figure 3This is a structural block diagram of the fusible plug protection control device provided in the third embodiment of the present invention. Figure 3 As shown, the device includes:

[0076] The monitoring module 31 is used to monitor the temperature of the refrigerant flowing to the fusible plug when the unit is running;

[0077] A determination module 32 is used to determine the range of the refrigerant temperature;

[0078] The control module 33 is configured to reduce the frequency of the compressor according to the current indoor temperature if the refrigerant temperature is greater than or equal to the first preset temperature and less than or equal to the second preset temperature.

[0079] Optionally, the control module 33 includes:

[0080] a first control unit, configured to control the frequency of the compressor to decrease to a first frequency if the current indoor temperature reaches a set temperature;

[0081] a second control unit, configured to control the frequency of the compressor to decrease to a second frequency if the current indoor temperature does not reach the set temperature;

[0082] The second frequency is greater than the first frequency.

[0083] Optionally, the control module 33 is also used to: after determining the range of the refrigerant temperature, if the refrigerant temperature is lower than the first preset temperature, control the unit to operate normally according to the current working mode; and if the refrigerant temperature is higher than the second preset temperature, output a first prompt message and control the unit to stop running after a first preset time.

[0084] Optionally, the above-mentioned device may also include: an alarm control module, which is used to output a second prompt message after monitoring the refrigerant temperature flowing to the fusible plug, if it is monitored that the change value of the refrigerant temperature within the second preset time is greater than a preset threshold, and control the unit to stop running after a third preset time.

[0085] Optionally, the control module 33 also includes: a third control unit, which is used to determine the target speed based on the condensing temperature corresponding to the current high pressure while reducing the frequency of the compressor according to the current indoor temperature, and increase the speed of the external fan to the target speed; or directly increase the speed of the external fan to the maximum speed.

[0086] Optionally, the second preset temperature is lower than the melting point of the fusible alloy.

[0087] The above-mentioned fusible plug protection control device can execute the fusible plug protection control method provided in the embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method. For technical details not fully described in this embodiment, please refer to the fusible plug protection control method provided in the embodiment of the present invention.

[0088] Example 4

[0089] This embodiment provides a unit, including: the fusible plug protection control device described in the above embodiment.

[0090] Example 5

[0091] This embodiment provides a computer device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method described in the above embodiment when executing the computer program.

[0092] Example 6

[0093] This embodiment further provides a non-volatile computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the method described in the above embodiment are implemented.

[0094] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of this embodiment.

[0095] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, or of course, by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A fusible plug protection control method, characterized in that: include: When the unit is running, monitor the temperature of the refrigerant flowing to the fusible plug; Determining the range of the refrigerant temperature; If the refrigerant temperature is greater than or equal to a first preset temperature and less than or equal to a second preset temperature, the compressor is reduced in frequency according to the current indoor temperature, and the second preset temperature is less than the melting point of the fusible alloy; If the refrigerant temperature is greater than the second preset temperature, a first prompt message is output, and the unit is controlled to stop running after a first preset time; If it is monitored that the change value of the refrigerant temperature within the second preset time is greater than the preset threshold, a second prompt message is output, and the unit is controlled to stop running after a third preset time.

2. The method according to claim 1, characterized in that Reduce the compressor frequency according to the current indoor temperature, including: If the current indoor temperature reaches the set temperature, controlling the frequency of the compressor to decrease to a first frequency; If the current indoor temperature does not reach the set temperature, controlling the frequency of the compressor to decrease to a second frequency; The second frequency is greater than the first frequency.

3. The method according to claim 1, characterized in that After determining the range of the refrigerant temperature, the method further includes: If the refrigerant temperature is lower than the first preset temperature, the unit is controlled to operate normally according to the current working mode.

4. The method according to any one of claims 1 to 3, characterized in that While reducing the compressor frequency according to the current indoor temperature, it also includes: Determine the target speed according to the condensing temperature corresponding to the current high pressure, and increase the speed of the external fan to the target speed; or, Directly increase the rotation speed of the external fan to the maximum rotation speed.

5. A fusible plug protection control device, characterized in that: include: A monitoring module is used to monitor the temperature of the refrigerant flowing to the fusible plug when the unit is running; A judgment module, used to judge the range of the refrigerant temperature; a control module configured to reduce the frequency of the compressor according to the current indoor temperature if the refrigerant temperature is greater than or equal to a first preset temperature and less than or equal to a second preset temperature, wherein the second preset temperature is less than the melting point of the fusible alloy; The control module is further configured to: output a first prompt message if the refrigerant temperature is greater than the second preset temperature, and control the unit to stop running after a first preset time; The fusible plug protection control device also includes: an alarm control module, which is used to output a second prompt message if it is monitored that the change value of the refrigerant temperature within the second preset time is greater than a preset threshold, and control the unit to stop running after a third preset time.

6. A unit, characterized in that: include: The fusible plug protection control device according to claim 5.

7. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method according to any one of claims 1 to 4 when executing the computer program.

8. A non-volatile computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 4 are implemented.

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