CN114025576A

CN114025576A - Heat dissipation system based on heat pump frequency converter and control method thereof

Info

Publication number: CN114025576A
Application number: CN202111339182.1A
Authority: CN
Inventors: 赵密升; 肖威; 李建国
Original assignee: Guangdong New Energy Technology Development Co Ltd
Current assignee: Guangdong New Energy Technology Development Co Ltd
Priority date: 2021-11-12
Filing date: 2021-11-12
Publication date: 2022-02-08

Abstract

The embodiment of the invention discloses a heat radiation system based on a heat pump frequency converter and a control method thereof. The heat dissipation system comprises a first circulation loop, a second circulation loop, a first temperature sensor, a controller and a cooperative temperature control loop. According to the technical scheme, the cooling form of the radiator and the working load of the heat pump system are dynamically adjusted through the acquired temperature of the frequency converter and the opening condition feedback of the system control three-way electromagnetic valve, optimal load and heat dissipation dynamic balance are achieved, the product performance is furthest exerted on the premise of ensuring the action safety of the frequency converter, double-loop circulation of cooling liquid flowing through a circulating pump is achieved, the temperature range and the temperature variable frequency of the heat pump frequency converter are monitored to achieve a feedback algorithm of a control model, the output power of the heat pump frequency converter is dynamically adjusted, the frequency converter can further fully exert the power of the frequency converter under various loads, compared with the power of a traditional frequency converter, the power of the frequency converter is improved by more than 30%, and the stability is higher.

Description

Heat dissipation system based on heat pump frequency converter and control method thereof

Technical Field

The embodiment of the invention relates to the technical field of heat pump control, in particular to a heat dissipation system based on a heat pump frequency converter and a control method thereof.

Background

The frequency converter is used as an electric energy conversion device, certain heat can be generated in the operation process of internal electric power and electronic components, and if the heat cannot be technically dissipated, the electric power and the electronic components can be damaged due to overheating. In the prior art, a frequency converter usually adopts an air cooling or liquid cooling mode for heat dissipation, wherein the air cooling heat dissipation mode is that a fan is used for stirring air flow, and air blows through fins of a heat sink so as to take away heat; the liquid cooling heat dissipation mode is to form a water channel in the radiator, and when cooling water flows through the radiator, the heat is taken away.

In the field of heat pump control, the traditional heat pump frequency converter adopts air cooling for heat dissipation, the design requirement on an air channel is high, the heat dissipation performance is poor, the energy efficiency of the frequency converter cannot be fully exerted, and the control cost is high; the traditional high-power frequency converter uses the refrigerant for heat dissipation, the temperature change of the refrigerant is large, the difficulty in controlling constant temperature heat dissipation is large, and the system is complex and poor in stability.

Disclosure of Invention

The embodiment of the invention provides a heat dissipation system based on a heat pump frequency converter and a control method thereof, which are used for realizing double-loop circulation of cooling liquid after flowing through a circulating pump, monitoring the temperature range and the temperature variable frequency of the heat pump frequency converter to realize a feedback algorithm of a control model, controlling the heat pump frequency converter to dynamically adjust the output power, further enabling the frequency converter to fully exert the power under various loads and improving the stability of the heat dissipation system.

In a first aspect, an embodiment of the present invention provides a heat dissipation system based on a heat pump frequency converter, including:

the first circulation loop comprises a frequency converter heat dissipation plate, a cooling liquid tank, a circulation pump and a three-way electromagnetic valve which are sequentially connected through a cooling liquid pipeline;

the second circulation loop comprises the frequency converter heat dissipation plate, the cooling liquid tank, the circulating pump, the three-way electromagnetic valve and the heat exchanger which are sequentially connected through a cooling liquid pipeline; the heat exchange efficiency of the second circulation loop is higher than that of the first circulation loop;

the first temperature sensor is arranged on the frequency converter cooling plate and used for collecting a first temperature value of the frequency converter cooling plate;

the controller is electrically connected with the first temperature sensor and used for respectively controlling the flow rates of the cooling liquid flowing through the first circulation loop and the second circulation loop through the three-way electromagnetic valve according to the first temperature value provided by the first temperature sensor;

and the cooperative temperature control loop consists of the first temperature sensor, the controller and a heat pump controller, and when the temperature rising rate of the heat pump frequency converter exceeds a preset maximum value or the heat pump frequency converter is in a high-temperature working state, the output power is controlled, and the temperature of the heat pump frequency converter is rapidly reduced.

Optionally, the first temperature sensor is further configured to acquire the first temperature value of the frequency converter heat dissipation plate according to a preset time period;

the controller is further configured to calculate a rate of change of temperature of the first temperature value, and perform the following steps:

when the first temperature value is larger than a first temperature preset value and smaller than or equal to a second temperature preset value, and the temperature change rate is larger than a first threshold value, controlling the flow of the cooling liquid flowing through the first circulation loop to be reduced, and simultaneously controlling the flow of the cooling liquid flowing through the second circulation loop to be increased;

when the first temperature value is greater than a second temperature preset value and less than or equal to a third temperature preset value, and the temperature change rate is less than or equal to a second threshold value, controlling the three-way electromagnetic valve to keep unchanged;

and when the first temperature value is greater than a second temperature preset value and less than or equal to a third temperature preset value, and the temperature change rate is greater than a second threshold value, controlling the flow of the cooling liquid flowing through the first circulation loop to be reduced, and simultaneously controlling the flow of the cooling liquid flowing through the second circulation loop to be increased.

Optionally, the heat dissipation system further includes a second temperature sensor and a third temperature sensor;

the second temperature sensor is arranged on the cooling liquid pipeline connected with the cooling liquid outlet of the frequency converter cooling plate in the first circulating loop, is connected with the controller and is used for collecting a second temperature value of the cooling liquid output from the frequency converter cooling plate;

the third temperature sensor is arranged on the cooling liquid pipeline connected with the cooling liquid inlet of the frequency converter cooling plate in the first circulating loop, is connected with the controller and is used for collecting a third temperature value of the cooling liquid flowing into the frequency converter cooling device;

the controller is further configured to calculate a difference between the second temperature value and the third temperature value, and perform the following steps:

when the first temperature value is greater than the first temperature preset value and less than or equal to a second temperature preset value, the temperature change rate is greater than the second threshold value and less than or equal to the first threshold value, and the difference value between the second temperature value and the third temperature value is less than or equal to a third threshold value, controlling the three-way electromagnetic valve to keep unchanged;

when the first temperature value is greater than the first temperature preset value and less than or equal to a second temperature preset value, the temperature change rate is greater than the second threshold value and less than or equal to the first threshold value, and the difference value between the second temperature value and the third temperature value is greater than a third threshold value, controlling the flow rate of the cooling liquid flowing through the first circulation loop to be reduced, and simultaneously controlling the flow rate of the cooling liquid flowing through the second circulation loop to be increased;

wherein the second threshold is less than the third threshold

Optionally, the heat dissipation system further includes a heat exchange loop, the heat exchange loop includes the heat exchanger and an evaporation loop of the heat pump device connected by a refrigerant pipe, and the evaporation loop of the heat pump device includes a compressor;

the heat dissipation system also comprises a fourth temperature sensor which is used for collecting a fourth temperature value of a refrigerant flowing through an evaporation loop of the heat pump device and flowing into the heat exchanger;

the controller is further configured to perform the steps of:

when the first temperature value is greater than or equal to a fourth temperature preset value, the temperature change rate is greater than the second threshold value, and the fourth temperature value is greater than or equal to the first temperature preset value, controlling the frequency of the compressor to be reduced;

when the first temperature value is greater than or equal to a fourth temperature preset value and the temperature change rate is less than or equal to the second threshold value, controlling the compressor to keep the current frequency;

wherein the third temperature preset value is less than the fourth temperature preset value.

Optionally, the controller is further configured to perform the following steps:

when the frequency of the compressor is smaller than a first preset frequency and the temperature change rate is larger than a second threshold value, controlling the flow rate of the cooling liquid flowing through the second circulation loop to be opened to a maximum value and controlling the frequency of the compressor to be reduced;

when the frequency of the compressor is reduced to a second preset frequency, operating the compressor at the second preset frequency;

when the frequency of the compressor is a second preset frequency and the first temperature value is greater than or equal to a fifth temperature preset value, controlling the compressor to close protection;

the fourth temperature preset value is smaller than the fifth temperature preset value, and the first preset frequency is greater than the second preset frequency.

In a second aspect, an embodiment of the present invention further provides a method for controlling a heat dissipation system based on a heat pump inverter, where the working method is applied to the heat dissipation system based on the heat pump inverter in the first aspect, and the method includes:

acquiring a first temperature value of a frequency converter cooling plate acquired by a first temperature sensor;

controlling the flow rates of the cooling liquid flowing through the first circulation loop and the second circulation loop respectively through a three-way valve according to the first temperature value provided by the first temperature sensor;

when the temperature rising rate of the heat pump frequency converter exceeds a preset maximum value or the heat pump frequency converter is in a high-temperature working state, the output power is controlled, and the temperature of the heat pump frequency converter is rapidly reduced.

Optionally, the controller is further configured to obtain the first temperature value of the frequency converter cooling plate, which is acquired by the first temperature sensor according to a preset time period, calculate a temperature change rate of the first temperature value, and execute the following steps:

when the first temperature value is greater than a second temperature preset value and less than or equal to a third temperature preset value, and the temperature change rate is greater than a second threshold value, controlling the flow of the cooling liquid flowing through the first circulation loop to be reduced, and simultaneously controlling the flow of the cooling liquid flowing through the second circulation loop to be increased;

wherein the first preset temperature value is less than the second preset temperature value, and the second preset temperature value is less than the third preset temperature value; the first threshold is greater than the second threshold.

Optionally, the heat dissipation system further comprises a second temperature sensor and a third temperature sensor; the controller is further configured to obtain a second temperature value of the coolant, which is acquired by the second temperature sensor and output from the frequency converter heat dissipation plate, and a third temperature value of the coolant, which is acquired by the third temperature sensor and flows into the frequency converter heat dissipation device, calculate a difference between the second temperature value and the third temperature value, and execute the following steps:

wherein the second threshold is less than the third threshold.

Optionally, the heat dissipation system further includes a heat exchange loop, the heat exchange loop includes a heat exchanger connected by a refrigerant pipe and an evaporation loop of the heat pump device, and the evaporation loop of the heat pump device includes a compressor; the heat dissipation system further comprises a fourth temperature sensor; the controller is further configured to obtain a fourth temperature value of the refrigerant flowing through the evaporation circuit of the heat pump apparatus and flowing into the heat exchanger, which is acquired by the fourth temperature sensor, and execute the following steps:

The cooling system based on the heat pump frequency converter provided by the embodiment comprises: the temperature control system comprises a first circulation loop, a second circulation loop, a first temperature sensor, a controller and a cooperative temperature control loop, wherein the first circulation loop comprises a frequency converter heat dissipation plate, a cooling liquid box, a circulation pump and a three-way electromagnetic valve which are sequentially connected through a cooling liquid pipeline, the second circulation loop comprises a frequency converter heat dissipation plate, a cooling liquid box, a circulation pump, a three-way electromagnetic valve and a heat exchanger which are sequentially connected through a cooling liquid pipeline, the heat exchange efficiency of the second circulation loop is higher than that of the first circulation loop, the first temperature sensor is arranged on the frequency converter heat dissipation plate and used for collecting a first temperature value of the frequency converter heat dissipation plate, the controller is electrically connected with the first temperature sensor and used for respectively controlling the flow of cooling liquid flowing through the first circulation loop and the second circulation loop through the three-way electromagnetic valve according to the first temperature value provided by the first temperature sensor, and the cooperative temperature control loop consists of a first temperature sensor, a controller and a heat pump controller and is used for controlling the output power and quickly reducing the temperature of the heat pump frequency converter when the temperature rising rate of the heat pump frequency converter exceeds a preset maximum value or the heat pump frequency converter is in a high-temperature working state. The first temperature value of the frequency converter heat dissipation plate acquired by the first temperature sensor reaches the three-way electromagnetic valve after the cooling liquid passes through the circulating pump according to the height of the first temperature value by the controller, the flow of the cooling liquid flowing through the first circulating loop and the second circulating loop is controlled by controlling the opening degree of the three-way electromagnetic valve, double-loop circulation of the cooling liquid after the cooling liquid passes through the circulating pump is realized, meanwhile, the temperature range and the temperature variable frequency of the heat pump frequency converter are monitored to realize a feedback algorithm of a control model, the output power of the heat pump frequency converter is controlled to be dynamically adjusted, the frequency converter can further fully exert the power of the frequency converter under various loads, and compared with the power of a traditional frequency converter, the power of the frequency converter is improved by more than 30%, and the frequency converter has higher stability.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:

fig. 1 is a schematic structural diagram of a heat dissipation system based on a heat pump frequency converter according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a heat exchange loop in a heat dissipation system based on a heat pump frequency converter according to an embodiment of the present invention;

fig. 3 is a schematic flowchart of a control method of a heat dissipation system based on a heat pump inverter according to an embodiment of the present invention;

fig. 4 is an overall control logic diagram of a control method of a heat dissipation system based on a heat pump inverter according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently or simultaneously. In addition, the order of the operations may be re-arranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like. In addition, the embodiments and features of the embodiments in the present invention may be combined with each other without conflict.

The term "include" and variations thereof as used herein are intended to be open-ended, i.e., "including but not limited to". The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment".

It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used for distinguishing corresponding contents, and are not used for limiting the order or interdependence relationship.

It is noted that references to "a", "an", and "the" modifications in the present invention are intended to be illustrative rather than limiting, and that those skilled in the art will recognize that reference to "one or more" unless the context clearly dictates otherwise.

Fig. 1 is a schematic structural diagram of a heat dissipation system based on a heat pump inverter according to an embodiment of the present invention. As shown in fig. 1, the heat dissipation system includes: a first circulation loop including a frequency converter heat dissipation plate 110, a cooling liquid tank 120, a circulation pump 130 and a three-way electromagnetic valve 140 connected in sequence by a cooling liquid pipeline, a second circulation loop including a frequency converter heat dissipation plate 110, a cooling liquid tank 120, a circulation pump 130, a three-way electromagnetic valve 140 and a heat exchanger 150 connected in sequence by a cooling liquid pipeline, the heat exchange efficiency of the second circulation loop is higher than that of the first circulation loop, a first temperature sensor 30 arranged on the frequency converter heat dissipation plate 110 for collecting a first temperature value of the frequency converter heat dissipation plate 110, a controller 40 electrically connected with the first temperature sensor 30 for controlling the flow rate of the cooling liquid flowing through the first circulation loop and the second circulation loop respectively by the three-way electromagnetic valve 140 according to the first temperature value provided by the first temperature sensor 30, cooperating with a temperature control loop (not shown in the figure), the first temperature sensor, the three-way electromagnetic valve and the three-way electromagnetic valve are connected in sequence by a cooling liquid pipeline, the first temperature sensor, And the controller and the heat pump controller are used for controlling the output power and quickly reducing the temperature of the heat pump frequency converter when the temperature rising rate of the heat pump frequency converter exceeds a preset maximum value or the heat pump frequency converter is in a high-temperature working state. .

Wherein, the converter is as an electric energy conversion equipment, and inside electric power and electronic components can produce certain heat at the operation in-process, if the heat can not distribute away in time, then can lead to electric power and electronic components to damage because of overheated. Therefore, in the present embodiment, the inverter heat dissipation plate 110 is used as a heat dissipation device, and the flow rates of the cooling liquid flowing through the first circulation circuit and the second circulation circuit are controlled according to the temperature change of the inverter heat dissipation plate 110, so as to stabilize the temperature of the inverter. The circulation pump 130 is used for driving the cooling liquid in the loop to circulate, and in the present embodiment, the cooling liquid flows from the cooling liquid tank through the circulation pump 130 via the cooling liquid pipeline, and the cooling liquid in the cooling liquid pipeline is circulated by the circulation pump 130. The heat exchanger 150 in the second circulation loop is used for transferring heat between two or more fluids with different temperatures, so that the heat is transferred from the fluid with higher temperature to the fluid with lower temperature, and the temperature of the fluid meets the heat dissipation requirement of the heat pump frequency converter.

Since the first circulation circuit exchanges heat with air and the second circulation circuit exchanges heat with another fluid or a refrigerant, the heat exchange efficiency of the second circulation circuit is higher than that of the first circulation circuit.

In addition, the three-way electromagnetic valve 140 adopts a working principle of one inlet and two outlets, for example, when the three-way electromagnetic valve 140 is not electrified, the valve core is in the original position, so that the first outlet is closed, the second outlet is opened, and after the three-way electromagnetic valve is electrified, the generated magnetic field sucks up the valve core, so that the second outlet is closed, and the first outlet is unblocked. In this embodiment, after the coolant passes through the coolant pipeline, flows from the coolant tank 120 through the circulation pump 130, and flows through the three-way electromagnetic valve 140, when the flow rate of the coolant flowing through the first circulation loop and the second circulation loop is controlled, when the stepper motor drives the valve core of the three-way electromagnetic valve 140 to rotate clockwise, the first circulation loop returns to be fully opened, the second circulation loop is closed, the valve core continues to rotate, the opening degree of the first circulation loop gradually decreases, the opening degree of the second circulation loop gradually increases, and the first circulation loop is closed until the opening degree of the second circulation loop is fully opened; when the stepping motor rotates anticlockwise to drive the valve core to rotate anticlockwise, the opening degree of the first circulation loop is gradually increased, the opening degree of the second circulation loop is gradually decreased, and the specific opening degree control of the first circulation loop and the second circulation loop needs to be controlled according to the temperature value of the frequency converter heat dissipation plate 110.

In this embodiment, adopt the coolant liquid that specific heat capacity is big and the temperature is low that prevents frostbite as heat-dissipating medium, this heat-dissipating medium temperature is stable, can not produce the low temperature and lead to the converter condensation to damage, and safety and stability is strong, and the coolant liquid carries out the double loop circulation of first circulation circuit and second circulation circuit through the circulating pump.

When the coolant flows through the three-way electromagnetic valve 140, the coolant flows into the frequency converter heat dissipation plate 110 for frequency conversion heat dissipation and then flows back to the coolant tank 120 to realize heat dissipation circulation, when the coolant flows through the second circulation loop, the coolant flows through the coolant pipeline from the coolant tank 120 for flow through the circulation pump, and after the coolant flows through the three-way electromagnetic valve 140, a part of the coolant flows into the heat exchanger 150 for heat exchange and then flows into the frequency converter heat dissipation plate 110 together with the coolant in the first circulation loop for frequency conversion heat dissipation and then flows back to the coolant tank 120 to realize heat dissipation circulation.

Specifically, in the present embodiment, the circulation pump 130 is turned on 5 seconds before the inverter is started, thereby opening the three-way solenoid valve 140 to circulate the coolant through the cooling pipe. The controller 40 is electrically connected to the first temperature sensor 30, the first temperature sensor 30 collects a first temperature value of the heat dissipation plate 110 of the inverter, in this embodiment, the first temperature value may be denoted as T1, the first temperature sensor 110 transmits the T1 collected in real time to the controller 40, the controller 40 reaches the three-way electromagnetic valve 140 after the cooling liquid passes through the circulation pump 130 according to the height of T1, and the flow rate of the cooling liquid flowing through the first circulation loop and the second circulation loop is controlled by controlling the opening degree of the three-way electromagnetic valve 140, so as to ensure the temperature stability of the inverter.

It should be noted that the specific example of the controller 40 controlling the flow rates of the cooling liquids flowing through the first circulation circuit and the second circulation circuit according to the level of T1 is described in other embodiments.

Optionally, the first temperature sensor 30 is further configured to acquire a first temperature value of the frequency converter heat dissipation plate 110 according to a preset time period, and the controller 40 is further configured to calculate a temperature change rate of the first temperature value, and execute the following steps: when the first temperature value T1 is greater than the first temperature preset value, is less than or equal to the second temperature preset value, and the temperature change rate is greater than the first threshold value, the flow rate of the coolant flowing through the first circulation loop is controlled to decrease, and the flow rate of the coolant flowing through the second circulation loop is controlled to increase, when the first temperature value T1 is greater than the second temperature preset value, is less than or equal to the third temperature preset value, and the temperature change rate is less than or equal to the second threshold value, the three-way solenoid valve 140 is controlled to remain unchanged, when the first temperature value T1 is greater than the second temperature preset value, is less than or equal to the third temperature preset value, and the temperature change rate is greater than the second threshold value, the flow rate of the coolant flowing through the first circulation loop is controlled to decrease, and the flow rate of the coolant flowing through the second circulation loop is controlled to increase, wherein the first temperature preset value is less than the second temperature preset value, and the second temperature preset value is less than the third temperature preset value, the first threshold is greater than the second threshold.

The first temperature sensor 30 is electrically connected to the controller 40, and the controller 40 sends a command for acquiring a temperature signal to the first temperature sensor 30. The preset time period is set reasonably by a designer according to the working power of the inverter heat dissipation plate 110, the preset time period may be stored in the controller 40 by the designer, the controller 40 collects the first temperature value T1 according to the preset time period, in this embodiment, the preset time period is 10s, that is, the first temperature sensor 30 is controlled to collect the first temperature value T1 of the inverter heat dissipation plate 110 once every 10s, the difference value of the temperature values obtained twice continuously is the temperature change rate of the first temperature value T1, in this embodiment, the temperature change rate is recorded as T5.

In addition, in the embodiment, the coolant with a large specific heat capacity and a low anti-freezing temperature is used as a heat dissipation medium, when the coolant circulates through the first circulation loop or the second circulation loop through the circulation pump 130, in order to ensure that the inverter has a stable temperature, a designer reasonably presets a first temperature preset value, a second temperature preset value, and a third temperature preset value, and determines the collected first temperature value T1 of the inverter heat dissipation plate 110 according to the three preset values to further control the opening degree of the three-way electromagnetic valve 140, so as to control the flow rates of the coolant flowing through the first circulation loop and the second circulation loop, in the embodiment, the first temperature preset value is set to 65 ℃, the second temperature preset value is set to 80 ℃, and the third temperature preset value is set to 90 ℃. The first threshold and the second threshold are used to determine the degree of change of the temperature change rate T5, in this embodiment, the first threshold is 1, the second threshold is 0, when the temperature change rate T5 is greater than 1, it indicates that the temperature of the inverter heat dissipation plate 110 continues to rise, and when the temperature change rate T5 is less than or equal to 0, it indicates that the temperature of the inverter heat dissipation plate 110 has fallen, and the amplitude of the temperature change is small.

Specifically, when the temperature is more than 65 ℃ and less than or equal to 80 ℃ and T5 is more than 1, the temperature of the frequency converter is slightly higher and continuously rises, at the moment, the cooling liquid flows through the three-way electromagnetic valve 140 through the cooling liquid pipeline, the controller 40 controls the opening degree of the three-way electromagnetic valve 140, the flow of the cooling liquid flowing through the first circulation loop is controlled to be reduced, and meanwhile, the flow of the cooling liquid flowing through the second circulation loop is increased; when the temperature is more than 80 ℃ and less than or equal to T1 and less than or equal to 90 ℃ and the temperature is less than or equal to T5 and less than or equal to 0, the temperature of the frequency converter is higher, but the temperature is reduced to some extent, and at the moment, the controller 40 can keep the current temperature of the frequency converter only by controlling the state of the three-way electromagnetic valve 140 to be unchanged; when the temperature is more than 80 ℃ and less than or equal to T1 and less than or equal to 90 ℃ and T5 is more than 0, the temperature of the frequency converter is higher, and the temperature is continuously increased, at the moment, in order to realize heat dissipation, the controller 40 controls the opening degree of the three-way electromagnetic valve 140, the flow of the cooling liquid flowing through the first circulation loop is controlled to be reduced, and the flow of the cooling liquid flowing through the second circulation loop is increased.

It should be noted that the flow rate of the coolant flowing through the first circulation circuit and the flow rate of the coolant flowing through the second circulation circuit are controlled by the opening degree of the three-way electromagnetic valve 140, and the opening degree control of the three-way electromagnetic valve 140 is already described in the above embodiments, and is not described here again.

Optionally, with continued reference to fig. 1, the heat dissipation system further includes a second temperature sensor 50 and a third temperature sensor 60, the second temperature sensor 50 is disposed on the coolant pipeline connected to the coolant outlet of the inverter heat dissipation plate 110 in the first circulation loop, and is connected to the controller 40, and is configured to collect a second temperature value of the coolant output from the inverter heat dissipation plate 110, the third temperature sensor 60 is disposed on the coolant pipeline connected to the coolant inlet of the inverter heat dissipation plate 110 in the first circulation loop, and is connected to the controller 40, and is configured to collect a third temperature value of the coolant flowing into the inverter heat dissipation plate 110, the controller 40 is further configured to calculate a difference between the second temperature value and the third temperature value, and perform the following steps: when the first temperature value T1 is greater than the first temperature preset value and less than or equal to the second temperature preset value, the temperature change rate T5 is greater than the second threshold value and less than or equal to the first threshold value, and the difference between the second temperature value and the third temperature value is less than or equal to the third threshold value, the three-way solenoid valve 140 is controlled to be kept unchanged, when the first temperature value T1 is greater than the first temperature preset value and less than or equal to the second temperature preset value, the temperature change rate T5 is greater than the second threshold value and less than or equal to the first threshold value, and the difference between the second temperature value and the third temperature value is greater than the third threshold value, the flow rate of the cooling liquid flowing through the first circulation loop is controlled to be reduced, and the flow rate of the cooling liquid flowing through the second circulation loop is controlled to be increased, wherein the second threshold value is less than the third threshold value.

On the basis of the above embodiment, the coolant passes through the coolant pipeline, flows through the circulation pump 130 from the coolant tank 120, flows through the three-way electromagnetic valve 140, flows into the frequency converter heat dissipation plate 110 for frequency conversion heat dissipation, and flows back to the coolant tank 120 to realize heat dissipation circulation, during this circulation process, the collected second temperature value and third temperature value can better monitor the first temperature value T2 and the temperature change rate T5, and the difference value between the second temperature value and the third temperature value calculated by the controller 40 according to the second temperature value and the third temperature value is used to represent the temperature change value during the process that the coolant flowing out of the coolant tank 120 flows into the coolant tank 120 after passing through the circulation pump 130 and the three-way electromagnetic valve 140, thereby further ensuring the stability of heat dissipation.

In this embodiment, the second temperature value is denoted as T2, the second temperature value is denoted as T3, the difference between the second temperature value T2 and the third temperature value T3 is denoted as T6, the maximum allowable range of the difference between the second temperature value T2 and the third temperature value T3 in the entire heat dissipation system is a third threshold value, and the third threshold value is set to 5.

Specifically, when the temperature is greater than 65 ℃ and less than or equal to T1 and less than or equal to 80 ℃, and 0 ℃ and less than or equal to T5 and less than or equal to 1, and T6 and less than or equal to 5, it indicates that the temperature of the frequency converter is slightly higher, the temperature rises in a short time, but the rising amplitude is not high, the temperature change value in the process that the cooling liquid flowing out of the cooling liquid tank 120 flows into the cooling liquid tank 120 after passing through the circulating pump 130 and the three-way electromagnetic valve 140 is smaller, and at this time, the controller 40 can maintain the current temperature of the frequency converter only by controlling the state of the three-way electromagnetic valve 140 to be unchanged; when the temperature of the frequency converter is higher than 65 ℃ and less than or equal to T1 and less than or equal to 80 ℃, and the temperature is higher than or equal to 0 and less than or equal to T5 and less than or equal to 1, and T6 is greater than 5, it is indicated that the temperature of the frequency converter is slightly higher, but the temperature is not higher in a short time, and the temperature change value in the process that the cooling liquid flowing out of the cooling liquid tank 120 flows into the cooling liquid tank 120 after passing through the circulating pump 130 and the three-way electromagnetic valve 140 is larger, at this time, the opening degree of the three-way electromagnetic valve 140 needs to be controlled by the controller 40 to reduce the temperature change value in the process that the cooling liquid flowing out of the cooling liquid tank 120 flows into the cooling liquid tank 120 after passing through the circulating pump 130 and the three-way electromagnetic valve 140, so as to keep the stability of the heat dissipation system, specifically, the opening degree of the three-way electromagnetic valve 140 is controlled by the controller 40 to reduce the flow rate of the cooling liquid flowing through the first circulation loop, and increase the flow rate of the cooling liquid flowing through the second circulation loop.

Optionally, the heat dissipation system further includes a heat exchange loop, the heat exchange loop includes a heat exchanger 150 and an evaporation loop 160 of the heat pump device, the evaporation loop of the heat pump device includes a compressor (not shown in fig. 1), the heat dissipation system further includes a fourth temperature sensor 70, configured to collect a fourth temperature value of a refrigerant flowing through the evaporation loop 160 of the heat pump device and flowing into the heat exchanger, and the controller 40 is further configured to perform the following steps: and when the first temperature value T1 is greater than or equal to a fourth temperature preset value, the temperature change rate T5 is greater than a second threshold value, and the fourth temperature value is greater than or equal to the first temperature preset value, controlling the frequency of the compressor to be reduced, and when the first temperature value T1 is greater than or equal to the fourth temperature preset value and the temperature change rate T5 is less than or equal to the second threshold value, controlling the compressor to keep the current frequency, wherein the third temperature preset value is less than the fourth temperature preset value.

Fig. 2 is a schematic structural diagram of a heat exchange loop in a heat dissipation system based on a heat pump frequency converter according to an embodiment of the present invention. As shown in fig. 2, the heat exchange circuit includes a heat exchanger 150 connected by a refrigerant pipe and an evaporation circuit of the heat pump apparatus, and the evaporation circuit of the heat pump apparatus includes a compressor 161. Referring to fig. 2, a specific process of the refrigerant of the evaporation loop of the heat pump device flowing into the inverter heat exchanger 150 for heat exchange includes a condenser 162, an expansion valve 163 and an evaporator 164, a branch of a thin pipe is taken from a pipeline in front of the expansion valve 163 of the heat pump system, and the refrigerant flows through the inverter heat exchanger for heat exchange and then flows back to the pipeline of the heat pump system. The temperature of the refrigerant before the heat pump expansion valve 163 is stabilized within a range of 25 to 40 degrees centigrade, and the heat exchanger is suitable for heat exchange of the frequency converter. The direct and frequency conversion driver circuit laminating increase heat transfer area of converter heat exchanger, if the too high heat transfer effect of heat transfer refrigerant is poor, if be less than 20 degrees vapor in the easy condensation air, cause the converter circuit short circuit.

On the basis of the above embodiment, referring to fig. 1, when the coolant flows through the second circulation loop, the coolant flows through the coolant pipeline from the coolant tank 120 through the circulation pump 130, and after flowing through the three-way solenoid valve 140, a part of the coolant flows into the heat exchanger 150 for heat exchange, and then flows into the frequency converter heat dissipation plate 110 for frequency conversion heat dissipation together with the coolant in the first circulation loop, and then flows back to the coolant tank 120 for heat dissipation circulation.

It should be noted that, in this embodiment, the fourth temperature sensor 70 may be disposed in a pipeline of the heat exchanger 150 flowing into the evaporation loop 160 of the heat pump device in the heat exchange loop, and is used for collecting a fourth temperature value of a refrigerant flowing into the heat exchanger 150 and flowing through the evaporation loop 160 of the heat pump device when the refrigerant flows into the heat exchanger 150, in which the fourth temperature value is T4, and the preset fourth temperature value is 85 ℃.

Specifically, when T1 is greater than or equal to 85 ℃, T5 is greater than 0, and T4 is greater than or equal to 60 ℃, it indicates that the current temperature of the frequency converter is high, and the temperature is continuously increased, and when part of the cooling liquid flows into the heat exchanger 150 for heat exchange, the return air temperature of the compressor during operation is increased, at this time, the controller 40 is required to control the rotation speed of the compressor 161 in the evaporation loop 160 of the heat pump device, so that the frequency of the compressor 161 is reduced, that is, the current temperature of the frequency converter can be maintained, and the heat dissipation stability is ensured; when the temperature T1 is more than or equal to 85 ℃ and the temperature T5 is less than or equal to 0, the current temperature of the frequency converter is higher, but the temperature is reduced to some extent, and at the moment, the controller 40 only needs to control the compressor 161 to keep the current rotating speed frequency to keep the current temperature.

Optionally, the controller 40 is further configured to perform the following steps: when the frequency of the compressor 161 is less than the first preset frequency and the temperature change rate T5 is greater than the second threshold, the flow rate of the cooling fluid flowing through the second circulation circuit is controlled to be maximum, and the frequency of the compressor 161 is controlled to be decreased, when the frequency of the compressor 161 is decreased to the second preset frequency, the compressor 161 is operated at the second preset frequency, and when the frequency of the compressor 161 is the second preset frequency and the first temperature value T1 is greater than or equal to the fifth temperature preset value, the compressor 161 is controlled to be turned off for protection, wherein the fourth temperature preset value is less than the fifth temperature preset value, and the first preset frequency is greater than the second preset frequency.

In this embodiment, the fifth temperature preset value is 95 ℃, and the first preset frequency and the second preset frequency are preset required frequencies when a designer exchanges heat between part of the cooling liquid flowing through the heat exchanger 150 and the return air refrigerant of the compressor 161 in the heat exchange loop according to the working rotating speed of the compressor 161. The first preset frequency is a medium frequency when the compressor 161 operates, the first preset frequency is denoted as F1, and F1 is 50Hz, when the compressor 161 operates at the medium frequency, the overall power of the frequency converter is low, the loss is low, the second preset frequency is a minimum frequency when the compressor 161 operates, and when the frequency of the compressor 161 is lower than the second preset frequency, the compressor 161 cannot rotate, so that when part of the cooling liquid flows through the heat exchanger 150, the return air refrigerant of the compressor 161 cannot exchange heat with the cooling liquid, the second preset frequency is denoted as F2, and F2 is 30 Hz.

Specifically, when the frequency of the compressor 161 is less than F1 and T5 > 0, it indicates that the temperature of the inverter is continuously increasing, and the coolant flowing through the three-way solenoid valve 140 needs to be subjected to heat exchange by the heat exchanger 150 to achieve the purpose of heat dissipation, at this time, the flow rate of the coolant flowing through the second circulation circuit is controlled to be set to the maximum value, so that the coolant is circulated by the second circulation circuit through the circulation pump 130, and the load of the compressor 161 currently performing return air refrigerant exchange with the heat exchanger 150 is continuously reduced, that is, the frequency of the compressor 61 is continuously reduced; when the frequency of the compressor 161 is reduced to F2, the compressor 161 is rotated at the frequency F2, if in the current state, T1 is greater than or equal to 95 ℃, which indicates that the temperature of the inverter reaches a limit value, at this time, the opening degree of the three-way electromagnetic valve 140 is controlled to control the flow rates of the cooling liquid flowing through the first circulation loop and the second circulation loop, so that the heat dissipation of the whole heat dissipation system cannot be realized, and in order to avoid the damage of the whole heat dissipation system and the inverter, the compressor of the inverter is directly closed, so that the protection of the system is realized.

Fig. 3 is a schematic flowchart of a method for controlling a heat dissipation system based on a heat pump inverter according to an embodiment of the present invention. As shown in fig. 3, the method specifically includes the following steps:

s310, acquiring a first temperature value of the frequency converter cooling plate acquired by the first temperature sensor.

And S320, respectively controlling the flow rates of the cooling liquid flowing through the first circulation loop and the second circulation loop through a three-way valve according to the first temperature value provided by the first temperature sensor.

S330, when the temperature rising rate of the heat pump frequency converter exceeds a preset maximum value or the heat pump frequency converter is in a high-temperature working state, controlling the output power and quickly reducing the temperature of the heat pump frequency converter.

Optionally, the controller is further configured to obtain a first temperature value of the frequency converter heat dissipation plate, which is acquired by the first temperature sensor according to a preset time period, calculate a temperature change rate of the first temperature value, and execute the following steps: when the first temperature value is greater than the first temperature preset value and less than or equal to the second temperature preset value, and the temperature change rate is greater than a first threshold value, controlling the flow of the cooling liquid flowing through the first circulation loop to be reduced, and simultaneously controlling the flow of the cooling liquid flowing through the second circulation loop to be increased, when the first temperature value is greater than the second temperature preset value and less than or equal to a third temperature preset value, and the temperature change rate is less than or equal to the second threshold value, controlling the three-way electromagnetic valve to be kept unchanged, when the first temperature value is greater than the second temperature preset value and less than or equal to the third temperature preset value, and the temperature change rate is greater than the second threshold value, controlling the flow of the cooling liquid flowing through the first circulation loop to be reduced, and simultaneously controlling the flow of the cooling liquid flowing through the second circulation loop to be increased, wherein the first temperature preset value is less than the second temperature preset value, and the second temperature preset value is less than the third temperature preset value, the first threshold is greater than the second threshold.

Optionally, the heat dissipation system further includes a second temperature sensor and a third temperature sensor, the controller is further configured to obtain a second temperature value of the coolant output from the heat dissipation plate of the frequency converter and collected by the second temperature sensor, and a third temperature value of the coolant flowing into the heat dissipation device of the frequency converter and collected by the third temperature sensor, calculate a difference between the second temperature value and the third temperature value, and perform the following steps: when the first temperature value is greater than the first temperature preset value and less than or equal to the second temperature preset value, the temperature change rate is greater than the second threshold value and less than or equal to the first threshold value, the difference value between the second temperature value and the third temperature value is less than or equal to the third threshold value, the three-way electromagnetic valve is controlled to be kept unchanged, when the first temperature value is greater than the first temperature preset value and less than or equal to the second temperature preset value, the temperature change rate is greater than the second threshold value and less than or equal to the first threshold value, and the difference value between the second temperature value and the third temperature value is greater than the third threshold value, the flow of the cooling liquid flowing through the first circulation loop is controlled to be reduced, and meanwhile, the flow of the cooling liquid flowing through the second circulation loop is controlled to be increased, wherein the second threshold value is less than the third threshold value.

It should be noted that the above description is made in detail in the working principle part of the heat dissipation system, and is not repeated herein.

The logic control of the working method of the heat dissipation system based on the heat pump frequency converter provided in this embodiment will be described as a whole.

Fig. 4 is an overall control logic diagram of a control method of a heat dissipation system based on a heat pump inverter according to an embodiment of the present invention. As shown in fig. 4, after the first temperature value T1 acquired by the first temperature sensor is acquired, the three-way solenoid valve is controlled to respectively control the flow rates of the cooling liquids of the first circulation loop and the second circulation loop according to the first temperature preset value (65 ℃), the second temperature preset value (80 ℃), the third temperature preset value (90 ℃), the temperature change rate (T5), the difference value T6 between the second temperature preset value and the third temperature preset value, the first threshold value (1), the second threshold value (2), and the third threshold value (5).

Specifically, referring to fig. 4, the first temperature sensor transmits T1 acquired in real time to the controller, and the controller makes a further determination according to the level of T1.

When T1 is less than or equal to 65 ℃, the temperature of the frequency converter is low, at the moment, the cooling liquid flows through the three-way electromagnetic valve through the cooling liquid pipeline, the opening degree of the three-way electromagnetic valve is controlled by the controller, the flow of the cooling liquid flowing through the first circulation loop is controlled to be maximum, and meanwhile, the three-way electromagnetic valve is controlled to be closed to flow the cooling liquid flowing to the second circulation loop.

When the temperature is more than 65 ℃ and less than or equal to T1 and less than or equal to 80 ℃, further judging the temperature change rate T5, and when T5 is more than 1, indicating that the temperature of the frequency converter is slightly higher and the temperature continuously rises, at the moment, cooling liquid flows through the three-way electromagnetic valve through the cooling liquid pipeline, the opening degree of the three-way electromagnetic valve is controlled by the controller, the flow of the cooling liquid flowing through the first circulation loop is controlled to be reduced, and meanwhile, the flow of the cooling liquid flowing through the second circulation loop is controlled to be increased; when the temperature is more than 65 ℃ and less than or equal to T1 and less than or equal to 80 ℃, further judging the temperature change rate T5, when the temperature is more than 0 and less than or equal to T5 and less than or equal to 1, further judging T6, and when the temperature is less than or equal to T6, indicating that the temperature of the frequency converter is slightly higher and rises within a short time, but the rising amplitude is not high, and the temperature change value of the cooling liquid flowing out of the cooling liquid box in the process of flowing into the cooling box after passing through the circulating pump and the three-way electromagnetic valve is smaller, at the moment, the controller can keep the current temperature of the frequency converter only by controlling the state of the three-way electromagnetic valve to be kept unchanged; when the temperature is greater than 65 ℃ and less than or equal to T1 and less than or equal to 80 ℃, further judging the temperature change rate T5, if the temperature is greater than 0 and less than or equal to T5 and less than or equal to 1, further judging the temperature T6, and if the temperature T6 is greater than 5, indicating that the temperature of the frequency converter is slightly higher and rises in a short time, but the rising amplitude is not high, and the temperature change value in the process that the cooling liquid flowing out of the cooling liquid tank flows into the cooling tank after passing through the circulating pump and the three-way electromagnetic valve is larger, at the moment, the opening degree of the three-way electromagnetic valve needs to be controlled by the controller to reduce the temperature change value in the process that the cooling liquid flowing out of the cooling liquid tank flows into the cooling tank after passing through the circulating pump and the three-way electromagnetic valve, so as to keep the stability of the heat dissipation system.

When the temperature is more than 80 ℃ and less than or equal to T1 and less than or equal to 90 ℃, further judging the temperature change rate T5, and when T5 is less than or equal to 0, the temperature of the frequency converter is higher, but the temperature is reduced to some extent, and at the moment, the controller can keep the current temperature of the frequency converter only by controlling the state of the three-way electromagnetic valve to be kept unchanged; when the temperature is more than 80 ℃ and less than or equal to T1 and less than or equal to 90 ℃, further judging the temperature change rate T5, and when T5 is more than 0, indicating that the temperature of the frequency converter is higher and the temperature is continuously increased, at the moment, in order to realize heat dissipation, controlling the opening degree of the three-way electromagnetic valve by the controller, controlling the flow of the cooling liquid flowing through the first circulation loop to be reduced, and simultaneously increasing the flow of the cooling liquid flowing through the second circulation loop.

When T1 is more than 90 ℃, the temperature of the frequency converter is higher but the temperature of the frequency converter does not reach the limit value, at the moment, the flow of the cooling liquid flowing through the second circulation loop is controlled to be opened to the maximum value, and the three-way electromagnetic valve is controlled to be closed to the cooling liquid flowing to the first circulation loop.

Optionally, the heat dissipation system further includes a heat exchange loop, the heat exchange loop includes a heat exchanger and an evaporation loop of the heat pump device, the evaporation loop of the heat pump device includes a compressor, the heat dissipation system further includes a fourth sensor, the controller is further configured to obtain a fourth temperature value of a refrigerant flowing through the evaporation loop of the heat pump device and flowing into the heat exchanger, which is collected by the fourth sensor, and execute the following steps: and when the first temperature value is greater than or equal to a fourth temperature preset value, the temperature change rate is greater than a second threshold value, and the fourth temperature value is greater than or equal to the first temperature preset value, controlling the frequency of the compressor to be reduced, and when the first temperature value is greater than or equal to the fourth temperature preset value and the temperature change rate is less than or equal to the second threshold value, controlling the compressor to keep the current frequency, wherein the third temperature preset value is less than the fourth temperature preset value.

Optionally, the controller is further configured to perform the following steps: and when the frequency of the compressor is less than the first preset frequency and the temperature change rate is greater than a second threshold value, controlling the flow of the cooling liquid flowing through the second circulation loop to be opened to the maximum value, and controlling the frequency of the compressor to be reduced, when the frequency of the compressor is reduced to the second preset frequency, operating the compressor at the second preset frequency, and when the frequency of the compressor is the second preset frequency and the first temperature value is greater than or equal to a fifth temperature preset value, controlling the compressor to be shut down for protection, wherein the fourth temperature preset value is less than the fifth temperature preset value, and the first preset frequency is greater than the second preset frequency.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A heat dissipation system based on a heat pump frequency converter is characterized by comprising:

the cooperative temperature control loop consists of the first temperature sensor, the controller and a heat pump controller; and the control device is used for controlling the output power and quickly reducing the temperature of the heat pump frequency converter when the temperature rising rate of the heat pump frequency converter exceeds a preset maximum value or the heat pump frequency converter is in a high-temperature working state.

2. The heat dissipation system of claim 1, wherein the first temperature sensor is further configured to acquire the first temperature value of the frequency converter heat dissipation plate according to a preset time period;

3. The heat dissipating system of claim 2, further comprising a second temperature sensor and a third temperature sensor;

wherein the second threshold is less than the third threshold.

4. The heat dissipation system of claim 2, further comprising a heat exchange circuit, wherein the heat exchange circuit comprises the heat exchanger and an evaporation circuit of the heat pump device connected by a refrigerant pipe, and the evaporation circuit of the heat pump device comprises a compressor;

the controller is further configured to perform the steps of:

5. The heat dissipating system of claim 4, wherein the controller is further configured to perform the steps of:

6. A control method of a heat pump frequency converter based heat dissipation system is applied to the heat pump frequency converter based heat dissipation system according to any one of claims 1-5, and is characterized by comprising the following steps:

7. The control method according to claim 6, wherein the controller is further configured to obtain the first temperature value of the inverter heat dissipation plate acquired by the first temperature sensor according to a preset time period, calculate a temperature change rate of the first temperature value, and perform the following steps:

8. The control method of claim 7, wherein the heat dissipation system further comprises a second temperature sensor and a third temperature sensor; the controller is further configured to obtain a second temperature value of the coolant, which is acquired by the second temperature sensor and output from the frequency converter heat dissipation plate, and a third temperature value of the coolant, which is acquired by the third temperature sensor and flows into the frequency converter heat dissipation device, calculate a difference between the second temperature value and the third temperature value, and execute the following steps:

wherein the second threshold is less than the third threshold.

9. The control method according to claim 7, wherein the heat dissipation system further comprises a heat exchange loop, the heat exchange loop comprises a heat exchanger and an evaporation loop of the heat pump device, the heat exchanger and the evaporation loop are connected through a refrigerant pipeline, and the evaporation loop of the heat pump device comprises a compressor; the heat dissipation system further comprises a fourth temperature sensor; the controller is further configured to obtain a fourth temperature value of the refrigerant flowing through the evaporation circuit of the heat pump apparatus and flowing into the heat exchanger, which is acquired by the fourth temperature sensor, and execute the following steps:

10. The control method of claim 9, wherein the controller is further configured to perform the steps of: