CN216121187U

CN216121187U - Compact frequency conversion laser heat dissipation system

Info

Publication number: CN216121187U
Application number: CN202121663120.1U
Authority: CN
Inventors: 江鹰
Original assignee: Lightning Arrow Ye Shanghai Laser Technology Co ltd
Current assignee: Lightning Arrow Ye Shanghai Laser Technology Co ltd
Priority date: 2021-07-21
Filing date: 2021-07-21
Publication date: 2022-03-22
Anticipated expiration: 2031-07-21

Abstract

The utility model discloses a compact type frequency conversion laser heat dissipation system, which comprises an evaporator, a gas-liquid separator, a compressor and a condenser, wherein a heat sink of the laser is directly connected with the flat surface of the evaporator through a thermal interface material piece; along the flowing direction of the refrigerant, an evaporator, a gas-liquid separator, a compressor, a condenser and a high-pressure liquid storage tank are sequentially connected and then connected to a refrigeration loop of the evaporator through the high-pressure liquid storage tank; the high-pressure liquid storage tank is used for compensating and adjusting the liquid refrigerant when the working condition changes; the compressor comprises a frequency conversion module used for controlling the power of the compressor, the frequency conversion module comprises a frequency converter, and the frequency converter is connected with a temperature sensor used for detecting the temperature change of the evaporator.

Description

Compact frequency conversion laser heat dissipation system

Technical Field

The utility model relates to a compact type frequency conversion laser heat dissipation system.

Background

The laser generates heat in the working process, and if the heat is not conducted away in time, the normal work of internal components can be influenced, so that the quality of output beams of the laser is reduced, and the service life of the laser is shortened. The higher the input power of the laser, the more pronounced the thermal effect. However, with the development of advanced laser manufacturing technology, high input power cannot be avoided. Therefore, the heat dissipation problem of the laser becomes one of the important problems restricting the high power laser.

At present, the adopted laser heat dissipation system mainly comprises two methods of air cooling and water cooling.

Air cooling is a common heat dissipation method for lasers. The heat generated by the heating element is transferred to the heat sink, and the surface of the heat sink is provided with the radiating fins to conduct away the heat through forced convection. However, because the heat exchange coefficient of air is limited, air cooling is mainly applied to lasers with low power, and the requirement cannot be met when a large-scale laser adopts the traditional air cooling technology.

The water cooling method mainly utilizes a water cooling machine to cool water, and the water is sent to the laser to exchange heat with the heat sink, so as to achieve the purpose of reducing the temperature of the laser. The main structure of the device comprises an inner circulation and an outer circulation; the internal circulation includes an evaporator, a condenser, a compressor, an expansion valve, and a gas-liquid separator. The compressor sucks in the refrigerant vapor generated by the evaporator, and the refrigerant is compressed into high-temperature and high-pressure vapor in the compressor. The high temperature and high pressure steam is sent to a condenser to release heat and be condensed into high pressure liquid. The liquid is throttled by an expansion valve and enters an evaporator. At this point, the coolant (water) that has cooled the laser enters the evaporator for heat exchange with the coolant liquid. The refrigerant liquid is converted to a refrigerant vapor to be drawn by the compressor into the next cycle. The chilled water with the temperature reduced in the external circulation is sent back to the laser generator to cool the generator. Thus, heat generated by operation of the laser can be dissipated to the environment through such a refrigeration cycle. However, the water cooling method has the problems of large occupied area, complex system, incapability of ensuring the heat dissipation effect, unstable operation process and the like. Particularly, with the development of the current high-power laser, the water-cooling heat dissipation system is more complex and occupies a large space.

The prior art has the following defects:

1. the existing structure needs to additionally arrange a water cooler to cool the secondary refrigerant (water), and then uses the water to exchange heat with the laser, so that the system is complex, the occupied area is large, the system is not compact enough, and the use requirement in a narrow space cannot be met.

2. The compressor is the core of the refrigeration system and is affected by the power change of the laser, and the compressor needs to be started and stopped frequently to realize the control of the refrigeration capacity of the refrigeration system. However, the metal parts are damaged due to the possible thermal shock in the frequent start-stop process, so that the service life of the compressor is shortened, and the production benefit is reduced.

3. To ensure the safety of the laser, the cooling capacity of the refrigeration system is usually designed according to the peak power of the laser. Therefore, when the laser is not in the peak operation, the refrigeration system still operates according to the maximum heat dissipation load, which is easy to cause energy waste.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the prior art and provide a compact variable frequency laser heat dissipation system with strong adjusting capability and good safety performance.

The technical problem to be solved can be implemented by the following technical scheme.

A compact heat dissipation system for frequency conversion laser comprises an evaporator, a gas-liquid separator, a compressor and a condenser, and is characterized in that,

the heat sink of the laser is directly connected to the flat surface of the evaporator via a thermal interface material (e.g., a thermally conductive silicone member); along the flowing direction of the refrigerant (including gas state and liquid state), an evaporator, a gas-liquid separator, a compressor, a condenser and a high-pressure liquid storage tank are formed and connected in sequence, and then the high-pressure liquid storage tank is connected to a refrigeration loop of the evaporator; the high-pressure liquid storage tank is used for compensating and adjusting the liquid refrigerant when the working condition changes;

the compressor comprises a frequency conversion module used for controlling the power of the compressor, the frequency conversion module comprises a frequency converter, and the frequency converter is connected with a temperature sensor used for detecting the temperature change of the evaporator.

As a preferred embodiment of the present invention, the evaporator is a plate evaporator.

As a further improvement of the technical scheme, a throttle valve is arranged on a connecting pipeline between the high-pressure liquid storage tank and the evaporator.

As a further improvement of the technical solution, the frequency conversion module further comprises a microprocessor and a PMW controller, wherein the microprocessor receives a signal from the temperature sensor and sends out a specific signal by comparing a difference between a set temperature and a temperature measured by the temperature sensor; and the PMW controller controls the analog circuit according to a signal sent by the microprocessor to adjust the rotating speed of the compressor.

As a further improvement of the technical scheme, all parts of the refrigeration loop and the frequency conversion module are arranged in the same box body.

The compact type frequency conversion laser heat dissipation system adopting the technical scheme has the following advantages or beneficial effects:

1. compared with the existing water cooling system for heat dissipation, the novel structural design scheme adopted by the utility model avoids using circulating water as an intermediate medium, integrates the evaporator of the refrigeration system and the laser through heat sink, and directly uses the evaporator to dissipate heat of the laser. The space utilization rate is effectively optimized, the heat dissipation system is more compact, and the requirements of different places, particularly under the application environment with limited size, are met.

2. Compared with a water cooling system, the frequency conversion adjusting type heat dissipation system adopted by the utility model can adjust the refrigerating capacity of the refrigerating system by utilizing the frequency converter according to the heat dissipation intensity of the laser. When the load of the laser changes, the frequency converter is used for stepless speed change, so that the rotating speed of the compressor slowly changes, the compressor is prevented from being started and stopped frequently, the service life of the compressor is prolonged, and the system is operated more stably and reliably.

3. When the power of the laser is increased, the heat effect is obviously increased, and components are easily damaged. Compared with the traditional water cooling system which directly works according to the maximum power requirement of laser heat dissipation, the design can dynamically respond in real time according to the heat dissipation requirement, and is more energy-saving and environment-friendly.

Drawings

FIG. 1 is a schematic structural diagram of a heat dissipation system of a compact frequency-variable laser according to the present invention;

FIG. 2 is a schematic view of the connection between the heat sink and the evaporator according to the present invention;

in the figure: 1-compressor 2-condenser 3-high pressure liquid storage tank 4-throttle valve 5-temperature sensor 6-evaporator 7-gas-liquid separator 8-frequency converter;

11-heat sink 12-heat conductive silicone grease;

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

The utility model provides a novel structure design of a compact frequency conversion laser heat dissipation system, which can enable the structure of the laser heat dissipation system to be more compact and ensure the heat dissipation effect. In addition, the frequency converter is added, so that the whole system is more stable and reliable in operation, the safety performance is improved, and the effect of saving energy is achieved.

Referring to fig. 1, the heat dissipation system includes two modules: refrigeration module and frequency conversion module.

The refrigeration module comprises an evaporator 6 (plate evaporator) with a flat surface, a compressor 1, a condenser 2, a throttle valve 4 (throttling equipment), a gas-liquid separator 7, a high-pressure liquid storage tank 3 (used for compensating and adjusting liquid refrigerants when working conditions change) and the like.

The frequency conversion module comprises a temperature sensor 5, a microprocessor, a PMW controller and a frequency converter 8 (frequency conversion device).

The heat dissipation system adopts the evaporator to directly dissipate heat of the laser, the heat sink of the laser is directly connected with the surface of the evaporator 6 (plate evaporator) with a flat surface through a thermal interface material (thermal interface material piece/thermal interface material layer), and a refrigerant in the evaporator absorbs energy dissipated by the heat sink of the laser and converts the energy from a liquid state to a gas state, so that the heat is taken away through phase change. Meanwhile, the compressor 1 is connected through the frequency converter 8, and the frequency converter 8 is connected with the temperature sensor 5.

As shown in fig. 2, the relationship between the heat sink 11, the thermal interface material (the thermally conductive silicone grease 12, or the thermally conductive silicone member, or the thermally conductive silicone layer), and the evaporator 6 is illustrated; that is, the heat sink 11 is connected to the surface of the flat-surface evaporator 6 through a thermal interface material. Other thermal interface material members may of course be used instead of the thermally conductive silicone grease 12.

The added frequency conversion module obviously improves the compactness and stability of the device on the premise of ensuring the heat dispersion performance, and is helpful for solving the situation that the laser is difficult to apply in a narrow space and has insufficient stability.

Particularly, the refrigeration module and the frequency conversion module are arranged in the same box body so as to reduce the space occupancy rate. The evaporator is provided with a temperature sensor 5 for detecting the temperature of the refrigerant flowing out of the laser heat sink. And controlling the rotating speed of the compressor according to the real-time temperature detected by the temperature sensor, and adjusting the refrigerating capacity.

The gas refrigerant is introduced into the compressor 1 and compressed into a high-temperature high-pressure gas. The high-temperature and high-pressure gas is carried to the condenser 2 to dissipate heat to the outside. The cooled refrigerant enters the throttle valve 4 to reach the evaporator 6, absorbs heat and is converted into a gas state again, and the gas is sucked by the compressor 1 to enter the next cycle. Compared with the prior art, the design system has the advantages that the complexity is obviously reduced, the occupied space is reduced, and the use of narrow space is not limited any more.

The radiating system is designed with the frequency conversion module specially for solving the problems of reliability and stability of the system, so that the whole system is more stable in operation. The frequency conversion module is applied to laser heat dissipation based on the refrigeration principle of a frequency conversion air conditioner, and a refrigerant is introduced into a refrigeration cycle to evaporate and absorb heat; the problem that the traditional water cooling circulation utilizes water as an intermediate medium, so that the volume and the mass are large is avoided; the temperature sensor 5 senses the temperature of the evaporator 6, sends a signal to the frequency converter 8, and adjusts the power of the compressor 1, so that the refrigerating capacity is adjusted, dynamic response is realized according to the heat dissipation requirement, energy conservation is realized, and the service life of the compressor is prolonged.

The frequency conversion module further receives a signal from the temperature sensor 5 through the microprocessor, and sends out a specific signal by comparing the difference between the set temperature and the temperature measured by the sensor. The PMW controller controls the analog circuit according to the signal sent by the microprocessor to regulate the rotating speed of the compressor 1. When the laser works under low power, the temperature of the evaporator is reduced, the temperature sensor 5 sends out a signal after detecting the temperature change, the rotating speed of the compressor 1 is reduced by the frequency converter 8, and the refrigerating capacity is adjusted. With prior art need utilize compressor 1 to frequently open and stop to control the refrigerating output different, this technical scheme utilizes converter 8 to adjust the rotational speed of compressor 1, can avoid frequently opening the damage to compressor components and parts of the in-process that stops. The stability and the reliability of the whole system are obviously improved, and the economic loss caused by the failure, the shutdown and the production halt of equipment is reduced. On the other hand, when the power of laser instrument rises, the fuel factor aggravates, CPU sends out the signal through the comparison to the temperature that sets for temperature and sensor detected, and the rotational speed is adjusted up to controller control executor (compressor), increases the refrigerating output, maintains that the laser instrument temperature is in a comparatively reasonable scope, has avoided the laser instrument serious overtemperature condition to appear, guarantees the safe operation of laser instrument. Compared with the traditional refrigeration system which generally adopts a mode of controlling the start and stop of the compressor for regulating heat, the variable-frequency refrigeration system can control the work of the compressor without repeatedly starting and stopping the compressor by controlling the frequency of power supply, can prolong the service life of the compressor compared with the traditional refrigeration mode, and is more energy-saving. The utility model can adopt or use the current advanced control technology of the variable frequency air conditioning system.

The working state of the typical compact frequency conversion laser heat dissipation system provided by the utility model is as follows:

before the laser starts to operate, the heat dissipation system is first turned on. The rotation speed of the compressor 1 is slowly increased under the action of the frequency converter 8, and the refrigerant gas is slowly sucked into the compressor 1. The compressor 1 does work, the refrigerant vapor is converted into high-temperature high-pressure vapor, and the high-temperature high-pressure vapor enters the condenser 2 to lose heat to the outside and is converted into refrigerant liquid again. The refrigerant liquid enters the evaporator 6 through the throttle valve 4, absorbs the heat from the laser heat sink, and is converted into refrigerant vapor to enter the cycle. In the process, the heat is dissipated from the laser heat sink to the outside, and the temperature of the laser is reduced. When the power of the laser is suddenly increased, the heat effect is also intensified correspondingly, and in order to avoid the damage of the heat effect to the equipment, the heat dissipation capacity, namely the refrigerating capacity, of the heat dissipation system must be increased. Compared with the traditional water-cooling circulation heat dissipation, the refrigeration system is always set to work under the requirement of the highest heat dissipation load of the laser. The compact frequency conversion heat dissipation system utilizes the frequency converter to adjust the rotating speed of the compressor, and has the advantages of flexible adjustment, wide range, energy conservation and environmental protection.

The frequency converter detects the temperature of the evaporator by using the detection device, and the temperature is processed by the microprocessor and then transmitted to the PWM controller in the form of signals. The controller increases the rotating speed of the compressor according to the instruction, and specifically shows that the effect of increasing the refrigerating capacity is achieved by increasing the power supply frequency. The system has the advantages of excellent compactness, strong regulating capability and good safety performance.

The heat dissipation system provided by the utility model has the following advantages:

1. the novel structure design is adopted, the refrigeration system is integrated into the laser, and the heat sink of the laser is directly connected with the surface of the evaporator through the thermal interface material, so that the compact design of the laser heat dissipation system is realized. Utilize the refrigeration system evaporimeter directly to cool down the laser heat sink, compare current laser heat dissipation system, under the condition of guaranteeing the same heat dissipation capacity (guarantee original heat dissipation intensity promptly), further optimized laser heat dissipation system's structure, solved its problem that occupies greatly to the space, the shared space of system obviously descends, makes the structure compacter, has improved the compact and the stability of system.

2. A frequency conversion module is added. The power of the compressor is adjusted by the frequency converter, so that the temperature is regulated and controlled, and the reliable and stable operation of the system is ensured. The frequency conversion module can dynamically respond according to the heat dissipation requirement, when the load of the laser changes, the rotation speed is stably changed by using the stepless starting mode of the frequency conversion system, the rotation speed of the compressor slowly changes, the damage caused by frequent starting and stopping of the compressor is avoided, and the service life of the compressor is prolonged.

3. When the power of the laser changes, the refrigerating system can dynamically respond according to the heat dissipation requirement of the laser, so that the refrigerating capacity is adjusted. The refrigeration system is prevented from working under the highest heat dissipation load intensity for a long time, the energy is saved, the environment is protected, and the production cost is reduced.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the system architecture of the present invention. In the practical implementation process, no matter how to change the composition, material and geometric dimension of the refrigeration module, the type of the refrigerant, the combination mode and connection mode of the refrigeration system, the type, shape or power of the frequency conversion module, the sensing mode, sensing position, processor form and controller form of the composition, combination mode and frequency conversion module, the change of the above forms can not radically change the gist of the utility model, namely the design of the compact laser frequency conversion heat dissipation system, the heat sink of the laser is directly connected with the surface of the evaporator; the frequency conversion module is added, namely when the load of the heat dissipation system is small, the rotating speed of the compressor is adjusted to change slowly, the compressor is prevented from being started and stopped frequently, when the power of the laser is increased, the rotating speed of the compressor is increased, the refrigerating capacity is improved, and the stable operation of the system is guaranteed. The compressor can realize dynamic response to the heat dissipation requirement of the laser, and the system is more energy-saving. They are therefore considered to be within the scope of the utility model as defined by the claims.

Claims

1. A compact heat dissipation system for a frequency conversion laser comprises an evaporator, a gas-liquid separator, a compressor and a condenser, and is characterized in that,

the heat sink of the laser is directly connected with the flat surface of the evaporator through a thermal interface material piece; along the flowing direction of the refrigerant, an evaporator, a gas-liquid separator, a compressor, a condenser and a high-pressure liquid storage tank are sequentially connected and then connected to a refrigeration loop of the evaporator through the high-pressure liquid storage tank; the high-pressure liquid storage tank is used for compensating and adjusting the liquid refrigerant when the working condition changes;

2. The compact variable frequency laser heat dissipation system of claim 1, wherein the evaporator is a plate evaporator.

3. The compact frequency-converted laser heat dissipation system as defined in claim 1, wherein a throttle valve is disposed on a connection pipeline between the high-pressure liquid storage tank and the evaporator.

4. The compact frequency converted laser heat removal system of claim 1, wherein the frequency conversion module further comprises a microprocessor and a PMW controller, the microprocessor receiving a signal from the temperature sensor and emitting a specific signal by comparing a difference between a set temperature and a temperature measured by the temperature sensor; and the PMW controller controls the analog circuit according to a signal sent by the microprocessor to adjust the rotating speed of the compressor.

5. The compact variable frequency laser cooling system as recited in claim 1, wherein the components of the refrigeration circuit and the variable frequency module are disposed in a same housing.

6. The system according to claim 1, wherein the thermal interface material is a thermally conductive silicone.