Inverter cooling system suitable for extremely cold environments

Abstract

The present invention provides a frequency converter heat dissipation device suitable for extremely cold environments, including a housing, a frequency converter movement substrate unit, a main contactor, an auxiliary preheating component, a temperature intelligent control system, a frequency converter and multiple temperature sensors in the cavity. The interior of the housing is divided into two chambers, an inner cavity and an outer cavity, by the frequency converter movement substrate unit; the frequency converter movement is located in the inner cavity and is installed on the substrate of the frequency converter movement substrate unit; the auxiliary preheating component is located in the inner cavity and heats the inner cavity; the inner cavity temperature sensor is installed in the inner cavity, collects the temperature in the inner cavity, and transmits the inner cavity temperature data to the temperature intelligent control system; when the inner cavity temperature data reaches the operating temperature range of the frequency converter, the temperature intelligent control system controls the main contactor to complete the power-on operation preparation of the frequency converter. The frequency converter heat dissipation device suitable for extremely cold environments ensures the operation and operation reliability of the frequency converter in extremely cold temperature environments.

Description

Technical Field

[0001] The invention relates to the technical field of frequency converter heat dissipation, and in particular to a frequency converter heat dissipation device suitable for extremely cold environments. Background Art

[0002] With the development of science and technology, the application fields of inverters are becoming more and more extensive, and special environment applications are also everywhere. For example: explosion-proof environment, waterproof environment, high temperature environment, low temperature environment, etc.

[0003] The inverter used in extremely cold temperature environment must meet its own internal ambient temperature conditions to operate normally. The control circuit components and power devices inside the inverter have certain requirements for the working environment temperature, generally between -10~+40℃, which is quite large compared with the extremely cold temperature environment below -40℃.

[0004] In the Chinese patent application with application number: 201920975983.9, a heat dissipation mechanism of a frequency converter is involved, including a frequency converter housing, a control button, a display screen and a heat dissipation component. The front face of the frequency converter housing is equipped with a display screen, the lower side of the display screen is equipped with a control button, and the interior of the frequency converter housing is equipped with a heat dissipation component; the heat dissipation component includes a heat dissipation hole, a dust-proof and breathable net, a control button, a connection seat, a heat dissipation fan, a positioning column, a threaded column and a heat sink. The upper side of the interior of the frequency converter housing is provided with a heat dissipation hole, the interior of the heat dissipation hole is equipped with a dust-proof and breathable net, the right end face of the frequency converter housing is equipped with a control button, the lower side of the interior of the frequency converter housing is equipped with a connection seat, the interior of the connection seat is equipped with a heat dissipation fan, the interior of the frequency converter housing is equipped with a positioning column, the left and right end faces of the frequency converter housing are connected with threaded columns, and the interior of the frequency converter housing is equipped with a heat sink. This patent is based on the heat dissipation design of frequency converters used in normal temperature environments and non-high altitude areas. The main solution is to improve heat dissipation efficiency and dust avoidance, and extend the service life of the inverter. However, it does not solve the problem of normal use of the inverter in extremely cold temperature environments.

[0005] In the Chinese patent application with application number: 201720247617.2, a heat sink for a frequency converter is involved. The heat sink for a high frequency converter includes a frequency converter, a frequency converter housing, an intelligent operation panel, an air outlet, a dust removal device, a heat dissipation hole, a heat dissipation fan, a lock nut, a temperature sensor, a heat absorption plate and a heat dissipation frame. The frequency converter is located inside the frequency converter housing; the heat absorption plate is welded to the bottom of the heat dissipation frame in the form of welding; the lock nut at the upper end of the heat dissipation fan is fixed with a reverse thread; a heat dissipation fan is arranged above the heat dissipation frame; the heat dissipation fan is arranged to be two on the left and right; and a temperature sensor is arranged inside the heat dissipation fan. This patent is based on the heat dissipation design of the frequency converter used in normal temperature environment and non-high altitude areas. The main problems solved are heat dissipation efficiency and dust avoidance, and the service life of the frequency converter is extended. However, the problem of normal use of the frequency converter in extremely cold temperature environment is not solved.

[0006] In the Chinese patent application with application number: 201721924482.5, a frequency converter with a heat dissipation rate adjusted according to the altitude is involved, including a frequency converter body and an air pressure sensor disposed outside the frequency converter body, wherein an AC / DC conversion circuit, a DC intermediate circuit, a central control module, a detection circuit, an inverter, a heat dissipation rate adjustment module, a heat sink, and a fan are also disposed in the frequency converter body, wherein the output end of the AC / DC conversion circuit is connected to the DC intermediate circuit and the inverter in sequence, the output end of the central control module is connected to the DC intermediate circuit and the inverter respectively, and the input end of the detection circuit is connected to the DC intermediate circuit and the inverter respectively. The output end of the inverter is connected, the output end of the detection circuit is connected to the input end of the central control module, the heat dissipation rate adjustment module is connected to the fan, and the heat sink is fixed to the surface of the inverter; wherein, the heat dissipation rate adjustment module is also provided with a filter circuit, an analog-to-digital conversion circuit, a controller, a PWM wave generation module, and a drive module, the input end of the filter circuit is connected to the air pressure sensor, the filter circuit, the analog-to-digital conversion circuit, the controller, the PWM wave generation module, and the drive module are connected in sequence, and the output end of the drive module is connected to the fan; an FPGA chip is provided in the controller. This patent is based on the heat dissipation design of the inverter used in normal temperature environment and high altitude areas. It mainly solves the influence of air density on heat dissipation efficiency and makes up for the problem of reduced capacity use of inverters in high altitude areas. However, it does not solve the problem of normal use of inverters in extremely cold temperature environments.

[0007] To this end, we invented a new inverter cooling device suitable for extremely cold environments to solve the above technical problems. Summary of the invention

[0008] The object of the present invention is to provide a frequency converter heat dissipation device which can be used in extremely cold temperature environments to meet its own internal temperature conditions and operate normally and reliably.

[0009] The purpose of the present invention can be achieved through the following technical measures: a frequency converter heat dissipation device suitable for extremely cold environments, the frequency converter heat dissipation device suitable for extremely cold environments comprises a box, a frequency converter movement substrate unit, a main contactor, an auxiliary preheating component, a temperature intelligent control system and a multi-zone temperature sensor in the cavity, the interior of the box is divided into two chambers, an inner cavity and an outer cavity, by the frequency converter movement substrate unit, the frequency converter movement is located in the inner cavity and is installed on the frequency converter movement substrate unit; the auxiliary preheating component is located in the inner cavity, and is a temperature sensor for the inner cavity and the frequency converter movement. The core substrate unit is heated; the inner cavity temperature sensor is installed in the inner cavity, connected to the temperature intelligent control system, collects the temperature in the inner cavity, and transmits the inner cavity temperature data to the temperature intelligent control system; the temperature intelligent control system is connected to the main contactor, one end of the main contactor is connected to the three-phase incoming power supply, and the other end is connected to the three-phase power input R / S / T terminal of the inverter. When the temperature intelligent control system determines that the inner cavity temperature data reaches the operating temperature range of the inverter, it controls the main contactor to be energized, and the inverter is powered on to complete the operation preparation.

[0010] The present invention also includes the following technical measures:

[0011] The inverter heat dissipation device suitable for extremely cold environments also includes an auxiliary heating control switch, which is connected to the auxiliary preheating component to control the auxiliary preheating component to be powered on for heating or powered off.

[0012] The main contactor, the auxiliary preheating component, the auxiliary heat control switch and the temperature intelligent control system are respectively mounted on the inverter core substrate unit.

[0013] The multiple temperature sensors include a substrate temperature sensor, an ambient temperature sensor, an external cavity temperature sensor and an internal cavity temperature sensor. The substrate temperature sensor is located on the inverter movement substrate unit, collects the temperature of the inverter movement substrate unit, and transmits it to the temperature intelligent control system; the ambient temperature sensor is installed through the wall on the rear cover wall of the external cavity, collects the ambient temperature, and transmits it to the temperature intelligent control system; the external cavity temperature sensor is located on the inner wall of the external cavity, collects the temperature inside the external cavity, and transmits it to the temperature intelligent control system; the internal cavity temperature sensor is located on the inner wall of the inner cavity, collects the temperature inside the inner cavity, and transmits it to the temperature intelligent control system; the temperature intelligent control system controls whether to turn off the auxiliary heat control switch according to the temperature information collected by each temperature sensor.

[0014] The inverter heat dissipation device suitable for extremely cold environments also includes a temperature display, which is located on the detachable front panel of the box and is connected to the temperature intelligent control system to display the temperature information of each location collected by the temperature sensor.

[0015] The inverter heat dissipation device suitable for extremely cold environments also includes an openable heat dissipation rain shower window, which is located on the back of the box and is connected to the temperature intelligent control system. The temperature intelligent control system controls whether to open the openable heat dissipation rain shower window based on temperature information collected by each temperature sensor.

[0016] The inverter heat dissipation device suitable for extremely cold environments also includes an external cavity oil-cooled heat dissipation component and an oil-cooled circulation pump flow sensor. The external cavity oil-cooled heat dissipation component and the oil-cooled circulation pump flow sensor are installed in the external cavity on the back of the inverter movement substrate unit and are connected by pipelines. The movement substrate of the inverter movement substrate unit is made of metal material with a relatively small thermal resistance coefficient to facilitate heat conduction and heat uniformity. The outlet of the external cavity oil-cooled heat dissipation component is connected to the inlet of the oil-cooled circulation pump flow sensor through a pipeline, and the outlet of the oil-cooled circulation pump flow sensor is connected to the substrate inside the inverter movement substrate unit through a pipeline. The cooling oil inlet of the cooling oil channel and the cooling oil outlet of the substrate cooling oil channel are connected to the inlet of the outer cavity oil-cooling heat dissipation component through a pipeline, thus forming a closed cooling oil circulation channel. After the temperature intelligent control system is powered on, the oil-cooling circulation pump flow sensor is controlled in real time to start running according to the temperature information collected by the substrate temperature sensor and the inner cavity temperature sensor, driving the cooling oil to flow in the substrate cooling oil channel, flow through the outer cavity oil-cooling heat dissipation component, and then flow through the oil-cooling circulation pump flow sensor for circulation, thereby improving the heat equalization efficiency and controlling the temperature value of the inner cavity and the inverter movement substrate unit.

[0017] The inverter cooling device suitable for extremely cold environments also includes a remote communication module, which is connected to the temperature intelligent control system. The temperature intelligent control system transmits the temperature information collected by each temperature sensor to the remote communication module, and uploads the temperature information to the host computer in real time through the remote communication module.

[0018] The remote communication module is also connected to the frequency converter. Under the control of the host computer, the remote communication module controls the operation of the frequency converter and the transmission of real-time data.

[0019] The inverter heat dissipation device suitable for extremely cold environments also includes an observation window, which is located on a detachable front panel of the box body and adopts a double-layer glass design to keep out the cold and keep warm.

[0020] The box adopts a closed dustproof double-layer design and is filled with foam in the middle.

[0021] The auxiliary preheating component includes a first auxiliary preheating component and a second auxiliary preheating component.

[0022] The inverter heat sink device suitable for extremely cold environment in the present invention is a motor control system device used in extremely cold, severe cold and extremely cold temperature environments, and can be used in high latitudes, scientific drilling, oil mines, wind power and other fields. The heat dissipation medium of the inverter heat sink device suitable for extremely cold environment is -70℃ cooling oil; the inverter power device substrate adopts low thermal resistance metal material oil cooling and heat equalization design; the substrate is embedded with oil cooling pipelines and is equipped with oil cooling and heat dissipation components, circulation pumps and flow detection and control functions; it is equipped with intelligent auxiliary preheating and preheating functions; it is equipped with temperature intelligent control system and heat source mode optional function; it is equipped with multi-zone temperature sensors to display the external environment, external cavity, inner cavity and substrate temperature in real time; the box body is sealed, heat-insulated and dust-proof double-layer insulation design, with an observation window, and a controllable rain shower window. The power device of the high-power inverter is directly installed on the oil-cooled heat dissipation substrate, and multiple low-power inverters can be directly installed on the oil-cooled heat dissipation substrate. The device ensures the operation and reliability of the inverter in extremely cold temperature environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural diagram of a specific embodiment of the inverter heat dissipation device suitable for an extremely cold environment of the present invention;

[0024] Figure 2 It is a schematic diagram of the internal cooling oil pipeline of the inverter core substrate in a specific embodiment of the present invention;

[0025] Figure 3 It is a block diagram of a frequency converter temperature control system in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings.

[0027] like Figure 1 As shown, Figure 1 The structure diagram of the inverter heat dissipation device suitable for extremely cold environment of the present invention. The inverter heat dissipation device suitable for extremely cold environment is composed of an outer cavity 1, an inner cavity 2, an outer cavity oil cooling heat dissipation component 3, an inverter 5, an inverter movement substrate unit 8, a substrate cooling oil channel 4, an oil cooling circulation pump flow sensor 7, a substrate temperature sensor 10, an ambient temperature sensor 11, an outer cavity temperature sensor 12, an inner cavity temperature sensor 16, an openable heat dissipation rain shower window 6, an LCD temperature display 20, a temperature intelligent control system 15, a remote communication module 18, a main contactor 9, an auxiliary heat control switch 19, a first auxiliary preheating component 14, a second auxiliary preheating component 17, an observation window 21, a box 13, etc.

[0028] The box body 13 of the present invention adopts a closed, heat-insulating and dust-proof double-layer design, and is filled with a foaming agent in the middle, which maximizes the heat-insulating and cold-proof effect; the detachable front panel of the box body 13 is provided with an LCD temperature display 20 and an observation window 21, and the observation window 21 adopts a double-layer glass design to keep out the cold; the three-phase power input, frequency conversion output and control line are respectively arranged at the lower part of the front panel of the box body 13, and are all designed as waterproof aviation connectors; an openable heat dissipation rain shower window 6 is provided on the back of the box body 13, and whether the rain shower window needs to be opened is determined according to the internal temperature of the box body; the interior of the box body 13 is divided into two chambers by the inverter movement substrate unit 8, the inner chamber 2 is close to the front panel, and the inverter 5, LCD temperature display 20 and temperature intelligent control system 15 are mainly installed, and the outer chamber 1 is close to the back, and the outer chamber oil-cooled heat dissipation component 3 and the openable heat dissipation rain shower window 6 are mainly installed.

[0029] The heat dissipation medium of the present invention is -70℃ cooling oil; the inverter core substrate unit 8 is made of metal material with low thermal resistance coefficient, and a cooling oil channel 4 is provided inside the substrate. Figure 2 As shown; the outer cavity 1 is provided with an outer cavity oil cooling and heat dissipation component 3 and an oil cooling circulation pump flow sensor 7.

[0030] The present invention is provided with an intelligent auxiliary preheating function. The first auxiliary preheating component 14 and the second auxiliary preheating component 17 are evenly installed on the IGBT module side of the inverter movement substrate unit 8. Before the inverter movement is powered on, the temperature of the inner cavity 2 must first be heated to a temperature range that ensures the safe operation of the electronic components. The first auxiliary preheating component 14 and the second auxiliary preheating component 17 are set for preheating the inverter cavity.

[0031] The present invention is provided with a temperature intelligent control system 15 and an LCD temperature display 20, with a heat source mode optional function; it is provided with a multi-zone temperature sensor 10 / 11 / 12 / 16, with external environment, external cavity, inner cavity and substrate temperature display.

[0032] The power device of the high-power inverter of the present invention is directly installed on the inverter core substrate unit 8, which is a substrate heat source mode; the low-power inverter can be directly installed on the inverter core substrate unit 8 as a whole, which is an intra-cavity heat source mode. Different heat source modes have different control temperature curves.

[0033] The present invention is applicable to the working process of the inverter heat dissipation device in an extremely cold environment, such as Figure 3As shown: power on - three-phase power supply is powered on - through the normally closed contact of the auxiliary heat control switch 19 - the auxiliary preheating component 14 / 17 is powered on for heating - the temperature intelligent control system 15 is powered on to collect and monitor the temperature - when the temperature preheating in the cavity reaches the operating temperature range of the inverter, the main contactor 9 is controlled to be attracted - the power input terminal RST of the inverter 5 is powered on - the inverter 5 is ready for operation - the remote communication module 18 data transmission control - the inverter 5 is started - the output terminal UVW of the inverter 5 is connected to the motor - the motor is powered on and runs;

[0034] like Figure 3 As shown: the temperature intelligent control system 15 is powered on to collect and monitor the temperature - control and start the oil cooling circulation pump flow sensor 7 - the cooling oil circulates through the substrate cooling oil channel 4 - the cooling oil circulates through the outer cavity oil cooling heat dissipation component 3 - uniformly heats to increase and control the temperature of the inner cavity 2;

[0035] like Figure 3 As shown: the temperature intelligent control system 15 is powered on to collect and monitor the temperature - collect the signal of the substrate temperature sensor 10 - collect the signal of the inner cavity temperature sensor 16 - collect the signal of the outer cavity temperature sensor 12 - collect the signal of the ambient temperature sensor 11 - intelligent control - real-time control according to the temperature curve whether to close the auxiliary heat control switch 19 - real-time control according to the temperature curve whether to open the outer cavity 1 heat dissipation rain shower window 6;

[0036] The temperature intelligent control system 15 is powered on to collect and monitor the temperature - the signal is transmitted to the LCD temperature control display 20 in real time; the temperature intelligent control system 15 is powered on to collect and monitor the temperature - real-time data transmission with the host computer through the remote communication module 18;

[0037] The frequency converter 5 transmits real-time data with the host computer through the remote communication module 18.

[0038] The inverter adopting the heat dissipation design of the present invention can meet the operating temperature requirements of internal control circuit components and power devices when used in extremely cold temperature environments, ensuring that the inverter can operate reliably in extremely cold temperature environments below -40°C.

Claims

1. A frequency converter heat sink suitable for extremely cold environments, characterized in that: The inverter heat dissipation device suitable for extremely cold environments includes a box body, an inverter movement substrate unit, a main contactor, an auxiliary preheating component, a temperature intelligent control system and a multi-zone temperature sensor in the cavity. The interior of the box body is divided into two chambers, an inner cavity and an outer cavity, by the inverter movement substrate unit. The inverter movement is located in the inner cavity and is installed on the inverter movement substrate unit; the auxiliary preheating component is located in the inner cavity to heat the inner cavity and the inverter movement substrate unit; the inner cavity temperature sensor is installed in the inner cavity, connected to the temperature intelligent control system, collects the temperature in the inner cavity, and transmits the inner cavity temperature data to the temperature intelligent control system; the temperature intelligent control system is connected to the main contactor, one end of the main contactor is connected to a three-phase incoming power supply, and the other end is connected to the inverter three-phase power input R / S / T terminal. When the temperature intelligent control system determines that the inner cavity temperature data reaches the operating temperature range of the inverter, it controls the main contactor to be pulled in, and the inverter is powered on to complete the operation preparation; The inverter heat dissipation device suitable for extremely cold environments also includes an auxiliary heat control switch, which is connected to the auxiliary preheating component to control the auxiliary preheating component to be powered on or powered off; The main contactor, the auxiliary preheating assembly, the auxiliary heat control switch and the temperature intelligent control system are respectively mounted on the inverter core substrate unit; The multi-zone temperature sensor includes a substrate temperature sensor, an ambient temperature sensor, an external cavity temperature sensor and an internal cavity temperature sensor. The substrate temperature sensor is located on the inverter movement substrate unit, collects the temperature of the inverter movement substrate unit, and transmits it to the temperature intelligent control system; the ambient temperature sensor is installed through the wall on the rear cover wall of the external cavity, collects the ambient temperature, and transmits it to the temperature intelligent control system; the external cavity temperature sensor is located on the inner side wall of the external cavity, collects the temperature in the external cavity, and transmits it to the temperature intelligent control system; the internal cavity temperature sensor is located on the inner side wall of the internal cavity, collects the temperature in the internal cavity, and transmits it to the temperature intelligent control system; the temperature intelligent control system controls whether to turn off the auxiliary heat control switch according to the temperature information collected by each temperature sensor; The inverter heat dissipation device suitable for extremely cold environments also includes a temperature display, which is located on the detachable front panel of the box and is connected to the temperature intelligent control system to display the temperature information of each zone collected by the temperature sensor; It also includes a remote communication module, which is connected to the temperature intelligent control system. The temperature intelligent control system transmits the temperature information collected by each temperature sensor to the remote communication module, and uploads the temperature information to the host computer in real time through the remote communication module; the remote communication module is also connected to the frequency converter. Under the control of the host computer, the remote communication module controls the operation of the frequency converter and the transmission of real-time data; The inverter heat dissipation device suitable for extremely cold environments also includes an openable heat dissipation rain shower window, which is located at the back of the box and is connected to the temperature intelligent control system. The temperature intelligent control system controls whether to open the openable heat dissipation rain shower window according to the temperature information collected by each temperature sensor; The inverter heat dissipation device suitable for extremely cold environments also includes an observation window, which is located on the detachable front panel of the box body and adopts a double-layer glass design to keep out the cold and keep warm; The box adopts a closed dustproof double-layer design, and the middle is filled with foaming agent; The auxiliary preheating component includes a first auxiliary preheating component and a second auxiliary preheating component; The inverter heat dissipation device suitable for extremely cold environments also includes an external cavity oil-cooled heat dissipation component and an oil-cooled circulation pump flow sensor. The external cavity oil-cooled heat dissipation component and the oil-cooled circulation pump flow sensor are installed in the external cavity on the back of the inverter movement substrate unit and are connected by pipelines. The movement substrate of the inverter movement substrate unit is made of metal to facilitate heat conduction and heat uniformity. The outlet of the external cavity oil-cooled heat dissipation component is connected to the inlet of the oil-cooled circulation pump flow sensor through a pipeline, and the outlet of the oil-cooled circulation pump flow sensor is connected to the substrate cooling oil channel inside the inverter movement substrate unit through a pipeline. The cooling oil inlet of the substrate cooling oil channel is connected to the inlet of the outer cavity oil-cooling heat dissipation component through a pipeline, thus forming a closed cooling oil circulation channel. After the temperature intelligent control system is powered on, the oil-cooling circulation pump flow sensor is controlled in real time to start running according to the temperature information collected by the substrate temperature sensor and the inner cavity temperature sensor, driving the cooling oil to flow in the substrate cooling oil channel, flow through the outer cavity oil-cooling heat dissipation component, and then flow through the oil-cooling circulation pump flow sensor for circulation, thereby improving the heat distribution efficiency and controlling the temperature value of the inner cavity and the inverter movement substrate unit.

Images