Cooling constant temperature device for laser module

Abstract

The utility model relates to the technical field of gas analysis based on a laser gas absorption spectrum technology, in particular to a laser module cooling constant temperature device, which comprises a laser module and a constant temperature control system, the laser module comprises a laser shell, a light source collimating lens, a laser fixing plate, a heat dissipation plate, a heat conduction groove, a gas inlet and outlet connector and a mounting hole, the constant-temperature control system comprises a temperature sensor, a temperature controller, a solid-state relay, an electromagnetic valve and a flow needle valve; a temperature controller in the constant-temperature control system receives a signal of a temperature sensor, outputs a control signal to a solid-state relay through PID operation, and controls on-off of an electromagnetic valve in real time so as to control the flow of heat-conducting fluid entering the laser module and lock the temperature of the laser module at a fixed temperature point, so that constant-temperature control over the laser module is achieved. The scheme is mainly suitable for a scene where the working environment temperature of the laser is high.

Description

Technical Field

[0001] The utility model relates to the technical field of gas analysis based on laser gas absorption spectroscopy technology, in particular to a laser module cooling and constant temperature device. Background Art

[0002] Gas composition analysis technology based on laser gas absorption spectroscopy has been widely used in various fields of production and life. Its working principle is to use a laser beam of a specific wavelength to pass through the gas to be measured and be partially absorbed by the gas. The relationship between the attenuation degree of light intensity and the concentration of the gas satisfies the Lambert-Beer theorem. Therefore, the concentration of the gas to be measured can be obtained by analyzing the attenuation information of the light intensity.

[0003] In practical applications, due to the temperature and composition characteristics of the gas to be measured, the laser often has to work in a high temperature environment of 40 to 70 degrees. The laser working environment must be cooled to prevent the laser from being damaged by excessive temperature. In addition, the laser is also very sensitive to fluctuations in ambient temperature. Temperature fluctuations of a few tenths of a degree will cause large changes in the laser spectrum, affecting the stability of the analytical instrument. The conventional practice is to use TEC cooling sheets to perform heat exchange treatment on the laser locally, but in this application, since the TEC cooling sheet itself is placed in a high temperature environment, the cooling efficiency is greatly reduced, and poor heat dissipation can easily lead to damage.

[0004] In summary, the utility model proposes a laser module cooling thermostat to solve the practical problems encountered in the above applications. This laser module cooling thermostat directly uses compressed air, cooling water, etc. that are easily available at the application site as heat transfer fluids, combined with temperature control elements with PID calculation output functions and fluid control elements such as solenoid valves, while achieving good cooling and heat dissipation functions, it locks the ambient temperature at a temperature point suitable for the operation of the laser module, greatly improving the working stability of the laser gas analyzer. Utility Model Content

[0005] The purpose of the utility model is to provide a laser module cooling constant temperature device to solve the practical problems encountered in the above applications.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A laser module cooling thermostat, comprising a laser module and a thermostat control system, wherein the laser module is designed with a heat sink and a fixing plate, the surface of the fixing plate has a laser housing fixed by a compression fixing form, and the outside of the fixing plate is provided with a heat dissipation device capable of fast, stable and fast heat dissipation;

[0008] The heat dissipation device includes a heat dissipation plate, which is fixedly mounted on the surface of the fixing plate. The gap between the laser housing and the heat dissipation plate is filled with thermal grease. The heat dissipation plate is designed with a laser mounting hole, and the laser housing is placed in the mounting hole.

[0009] Among them, the heat sink is designed with an upper heat conduction groove and a lower heat conduction groove.

[0010] Preferably, two air inlet and outlet joints are installed at both ends of the upper heat-conducting groove and the lower heat-conducting groove, and the heat-conducting fluid is introduced into and flows out of the laser module respectively through the two air inlet and outlet joints.

[0011] Preferably, the constant temperature control system includes a temperature sensor, a temperature controller, a solid-state relay, a solenoid valve, and a flow needle valve.

[0012] Preferably, the temperature controller in the constant temperature control system receives a signal from the temperature sensor, compares it with the set temperature, and outputs a control signal to the solid-state relay through PID calculation to control the on and off of the solenoid valve in real time.

[0013] Preferably, the constant temperature control system uses compressed air or refrigerant gas or liquid as the heat transfer fluid, the flow needle valve limits the pressure and flow rate of the heat transfer fluid entering the system, and the solenoid valve is connected after the flow needle valve. Under the control of the solid-state relay, it is frequently turned on and off to allow the heat transfer fluid to enter the laser module in a pulsed manner, locking the temperature of the laser module at a fixed temperature point, thereby achieving constant temperature control of the laser module.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] In the utility model, the working environment temperature of the laser is lowered by introducing a heat-conducting fluid into the laser module, so that the laser can work normally at a higher ambient temperature; at the same time, by configuring a temperature control system, the temperature control technology is combined with the fluid heat-conducting technology, and the purpose of controlling the constant temperature of the laser environment is achieved while dissipating heat, thereby providing a stable and suitable working environment temperature for the laser and ensuring the measurement stability of the analytical instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the structure diagram of the laser module of the utility model;

[0017] Figure 2 This is a schematic diagram of the upper heat conduction groove of the utility model;

[0018] Figure 3 This is a control flow chart of the cooling thermostatic device of the laser module of the utility model;

[0019] Figure 4 This is a schematic diagram of disassembly and assembly of the utility model;

[0020] Figure 5 This is a schematic diagram of the matching relationship between the laser housing and the mounting hole of the utility model;

[0021] Figure 6 This is the positional relationship between the laser fixing plate and the laser housing of the utility model.

[0022] In the figure: 1. Laser housing; 2. Heat sink; 3. Light source collimating lens; 4. Laser fixing plate; 5. Air inlet and outlet joints; 6. Upper heat conduction groove; 7. Lower heat conduction groove; 8. Mounting hole. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0024] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively with reference to the relevant drawings below. Several embodiments of the utility model are given. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0027] For examples, see Figure 1-6 , the utility model provides a technical solution:

[0028] A laser module cooling and constant temperature device includes a laser module and a constant temperature control system. The laser module is designed with a heat sink 2, and the heat sink 2 is designed with a laser mounting hole. The laser housing 1 is placed in the mounting hole 8, and a laser fixing plate 4 is used to press and fix the laser housing 1 on the heat sink 2. The gap between the laser housing 1 and the heat sink 2 is filled with thermal grease. The heat sink 2 is designed with a light source collimating lens 3, which is located just in front of the light emitting direction of the device inside the laser housing 1 and is installed on the heat sink 2 by bonding or threading. The temperature control system includes a temperature sensor, a temperature controller, a solid-state relay, a solenoid valve, and a flow needle valve. The temperature controller in the constant temperature control system receives the signal from the temperature sensor, compares it with the set temperature, and outputs a control signal to the solid-state relay through PID calculation, so as to control the on and off of the solenoid valve in real time, thereby controlling the flow of the heat-conducting fluid.

[0029] As a preferred solution of the utility model, the heat sink 2 is made of aluminum alloy, which has good thermal conductivity and can reduce the weight of the structure. The aluminum alloy heat sink 2 is designed with an upper heat conduction groove 6 and a lower heat conduction groove 7. Two inlet and outlet joints 5 are respectively provided at both ends of the upper heat conduction groove 6 and the lower heat conduction groove 7. The heat conduction fluid enters the laser module through the inlet and outlet joints 5, flows through the heat conduction groove, takes away the heat on the aluminum alloy heat sink, and finally flows out of the other inlet and outlet joints 5.

[0030] As a preferred solution of the utility model, a transverse heat conduction groove is designed on the upper and lower parts of the laser housing 1. Since the lower heat conduction groove 7 is closer to the air inlet and outlet, the cross-sectional area of ​​the lower heat conduction groove 7 is designed to be smaller than the cross-sectional area of ​​the upper heat conduction groove 6 to ensure that the flow rates of the upper and lower heat conduction groove circuits of the laser light source are equivalent.

[0031] As a preferred solution of the utility model, the gap between the laser mounting hole 8 on the heat sink 2 and the laser housing 1 is designed to be as small as possible while meeting the tolerance of the laser housing 1, and the gap between the laser housing 1 and the mounting hole 8 of the fixing plate is filled with thermal grease to ensure good thermal conductivity between the laser housing and the fixing plate.

[0032] As a preferred solution of the utility model, a high-frequency and high-life electromagnetic valve is selected to meet the system's fast pulse working mode.

[0033] As a preferred solution of the utility model, compressed air is selected as the heat transfer fluid when the heat dissipation requirements can be met. It is easier to obtain at the application site and has lower sealing requirements. When the ambient temperature is too high and compressed air cannot meet the requirements, clean water is selected as the heat transfer fluid to enhance the heat transfer efficiency.

[0034] The working process of the utility model is as follows: the heat transfer fluid is controlled by the flow needle valve and the solenoid valve, enters the laser module through the air inlet joint, flows through the heat transfer groove, takes away the heat on the aluminum alloy heat sink, and finally flows out from the air outlet joint. The temperature controller in the constant temperature control system receives the signal of the temperature sensor, outputs the control signal to the solid-state relay through PID operation, and controls the on and off of the solenoid valve in real time to control the flow of the heat transfer fluid entering the laser module, and locks the temperature of the laser module at a fixed temperature point, thereby realizing constant temperature control of the laser module. This solution is mainly suitable for scenes with high working environment temperature of the laser. In such scenes, the laser itself has a large heat dissipation demand. At the same time, the laser is also extremely sensitive to changes in ambient temperature. Fluctuations in ambient temperature will cause fluctuations in the absorption spectrum of the laser gas, causing measurement drift. This solution achieves the purpose of controlling the constant temperature of the laser environment while dissipating heat, thereby providing a stable and suitable working environment temperature for the laser, and ensuring the measurement stability of the analytical instrument.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A laser module cooling and constant temperature device, comprising a laser module and a constant temperature control system, characterized in that: The laser module is designed with a heat sink (2) and a fixing plate (4); the surface of the fixing plate (4) has a laser housing (1) fixed by a compression fixation method; and the outside of the fixing plate (4) is provided with a heat dissipation device capable of rapid, stable and rapid heat dissipation; The heat dissipation device comprises a heat dissipation plate (2), the heat dissipation plate (2) is fixedly mounted on the surface of a fixing plate (4), a gap between the laser housing (1) and the heat dissipation plate (2) is filled with thermal grease, a laser mounting hole (8) is designed on the heat dissipation plate (2), and the laser housing (1) is placed in the mounting hole (8); The heat dissipation plate (2) is internally designed with an upper heat conduction groove (6) and a lower heat conduction groove (7).

2. A laser module cooling and constant temperature device according to claim 1, characterized in that: Two inlet and outlet gas joints (5) are installed at both ends of the upper heat conduction groove (6) and the lower heat conduction groove (7), and the heat conduction fluid is respectively introduced into and flows out of the laser module through the two inlet and outlet gas joints (5).

3. The laser module cooling and constant temperature device according to claim 1, characterized in that: The constant temperature control system includes a temperature sensor, a temperature controller, a solid-state relay, a solenoid valve, and a flow needle valve.

4. A laser module cooling and constant temperature device according to claim 3, characterized in that: The temperature controller in the constant temperature control system receives the signal from the temperature sensor, compares it with the set temperature, and outputs a control signal to the solid-state relay through PID calculation to control the on and off of the solenoid valve in real time.

5. A laser module cooling and constant temperature device according to claim 4, characterized in that: The constant temperature control system uses compressed air or refrigerant gas or liquid as the heat transfer fluid. The flow needle valve limits the pressure and flow rate of the heat transfer fluid entering the system. The solenoid valve is connected after the flow needle valve. Under the control of the solid-state relay, it is frequently turned on and off to allow the heat transfer fluid to enter the laser module in a pulsed manner, locking the temperature of the laser module at a fixed temperature point, thereby achieving constant temperature control of the laser module.

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