CN202453751U - Temperature control device for optical detecting device applied online - Google Patents

Abstract

The utility model provides an online temperature control device for an optical detection device, which can solve the problems in the prior art such as unstable detection results and high dark noise caused by excessive temperature or instability of the optical detection device. The technical solution is an online temperature control device for optical detection devices, including a base and a sleeve on the base, an optical detection device and a temperature sensor are installed inside the sleeve, one end of the sleeve is connected to the reaction chamber, and the other end is set There is a gland and is light-sealed. Two semiconductor cooling chips are installed on the upper part of the sleeve. The semiconductor cooling chip is equipped with a heat sink, and the cooling fin is equipped with a cooling fan. The utility model adopts dual semi-conductor refrigeration sheets for temperature control, and adopts the method of hierarchical control of refrigeration sheets according to different external temperature conditions, so that the temperature control is more flexible, which can not only ensure sufficient temperature control efficiency, but also achieve power saving effect .

Description

An optical detection device temperature control device for online application

technical field

The utility model belongs to an on-line analysis and detection instrument, in particular to a device for controlling the temperature of an optical detection device of an on-line analysis and detection instrument using an optical method. the

Background technique

On-line analysis and detection instruments are usually realized by optical methods. Due to the heat generation of electronic devices or the influence of external ambient temperature, optical detection devices generally work under higher temperature conditions. The online application of optical detection device temperature control devices can be used for optical methods. The temperature control of the optical detection device (usually a photomultiplier tube) of the online analysis instrument, through this device, can provide an ideal working environment for the optical detection device: stable and low temperature. the

The existing optical detection devices used in on-line analytical instruments usually have a structural design without a temperature control device or a simple open-loop temperature control device. After actual use, it is found that the shortcomings of this device are: 1. Due to the working environment of the on-line instrument Complex, the dark noise of the photoelectric detection device is large and unstable, which is not conducive to the stable operation of the instrument. 2. Lack of temperature sensor for real-time monitoring of temperature, unable to control the temperature in a relatively stable state, usually makes the photoelectric detection device in a very low temperature environment, so that the window of the photoelectric detection device is easy to fog, which affects the detection results of the instrument . 3. The temperature control of a single semiconductor cooling chip cannot guarantee sufficient temperature control efficiency at different external temperatures, especially at high temperatures. 4. The open-loop control method is relatively simple and cannot accurately control the temperature. the

Contents of the invention

The utility model provides an on-line temperature control device for an optical detection device, which can solve the problems in the prior art such as unstable detection results and high dark noise caused by excessive temperature or instability of the optical detection device. the

In order to achieve the purpose of solving the above technical problems, the technical solution of this utility model is an optical detection device temperature control device for online application, including a base and a sleeve on the base, a temperature sensor and a mounting device are installed in the sleeve. In the inner chamber of the photoelectric detection device, one end of the sleeve is connected to the reaction chamber, and the other end is provided with a gland and is optically sealed. Two semiconductor cooling chips are installed on the upper part of the sleeve, and the semiconductor cooling chip is equipped with The cooling fin is equipped with a cooling fan. the

Further, the sleeve is designed as an outer square inner circle structure, which facilitates the installation of optical detection devices, temperature sensors and semiconductor refrigeration chips, and at the same time places dry silica gel. the

Still further, the sleeve is made of aluminum, and the exposed part is wrapped with thermal insulation stickers. the

Furthermore, it is possible to control two of the peltiers to work at the same time, or to control one of the peltiers to work. the

Still further, the cold and hot sides of the semiconductor cooling chip are tightly installed with the outer side of the sleeve and the heat sink respectively by using heat-conducting silicone grease. the

Furthermore, the semiconductor refrigeration chip and the temperature sensor adopt closed-loop PID control technology. the

Still further, the gland and the sleeve are connected by threads, and the joint surface is optically sealed by an O-ring. the

Furthermore, an aviation plug is installed on the gland, and the aviation plug is a watertight plug. the

Optionally, the inner diameter of the sleeve is 20-50mm, and the length is 50-80mm. the

Optionally, the temperature control startup temperature upper limit is 25°C, and is stable at 5°C. the

Optionally, the specification of the semiconductor cooling sheet is a cube of 20-30 mm. the

Compared with the prior art, the utility model has the following advantages and positive effects:

1. Adopt dual semiconductor refrigeration chips for temperature control. According to different external temperature conditions, the method of hierarchical control of refrigeration chips is adopted to control the temperature more flexibly, which can not only ensure sufficient temperature control efficiency, but also achieve power saving effect.

2. A temperature sensor is added for temperature feedback, and the closed-loop PID control method is adopted, which greatly improves the accuracy of temperature control, provides an ideal working environment for optical detection devices, and reduces its own dark noise and instability. the

3. The gland adopts threads and O-rings, and at the same time uses aviation plugs for electrical connection, which is quick and easy to assemble and disassemble, and is easy to operate. the

Description of drawings

Fig. 1 is the schematic diagram of a kind of on-line application optical detection device temperature control device of the present utility model;

1. Photoelectric detection device; 2. Sleeve; 3. Temperature sensor; 4. Semiconductor cooling sheet; 5. Heat sink; 6. Cooling fan; 7. Gland; 8. O-shaped rubber ring; 9. Aviation plug; 10 . Base; 11. Reaction chamber.

Detailed ways

Referring to Fig. 1, the utility model comprises a base 10 and a sleeve 2 on the base 10, an optical detection device 1 and a temperature sensor 3 are installed inside the sleeve 2, and one end of the sleeve 2 is connected with a reaction chamber 11, The other end is provided with a gland 7 and is optically sealed. Two semiconductor cooling fins 4 are installed on the upper part of the sleeve 2, and a cooling fin 5 is mounted on the semiconductor cooling fin 4, and a cooling fan 6 is mounted on the cooling fin 5. the

When installing, first install the photoelectric detection device 1 in the sleeve 2 and fix it with a bolt on one side. Then install the temperature sensor 3. The electrical wiring of the photoelectric detection device 1 and the temperature sensor 3 is welded on the inner terminal of the aviation plug 9, and then the aviation plug 9 is installed on the gland 7, and the gland 7 is connected to the sleeve 2 by thread and O-shaped rubber ring 8 , forming a light seal. The semiconductor refrigeration sheet 4 is two independent semiconductor refrigeration sheets, the surface is coated with heat-conducting silicone grease, the cooling surface is closely attached to the sleeve 2, and the heating surface is closely attached to the heat sink 5. The fixed bolts are tightly embedded between the two. The cooling fan 6 is connected with the cooling fin 5 by bolts. The sleeve 2 is connected with the reaction chamber 11 by threads. the

In order to control the temperature flexibly and accurately, the semiconductor cooling chip 4 adopts the mode of two independent installation and independent control. When starting to work, when the system detects that the initial temperature inside the sleeve 2 is higher than 25°C, the semiconductor cooling sheet 4 will start to run two pieces at the same time, the heat sink 5 and the cooling fan 6 will take away the heat, and the temperature inside the sleeve 2 will continue to drop , when the temperature dropped to 5°C, the semiconducting refrigerating sheet 4 was turned off and only one was left to work. And 5°C is the ideal working temperature of the general optical detection device 1, if the temperature is too low, the window is prone to fogging, and if the temperature is too high, there will be obviously increased dark noise. the

During the temperature control process, the semiconductor cooling chip 4 cooperates with the temperature sensor 3 to adopt PID closed-loop control, and the PWM of the solid state relay corresponding to the semiconductor cooling chip 4 is controlled by the program, and then the temperature is stabilized. the

The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model in other forms. Any skilled person who is familiar with this profession may use the technical content disclosed above to change or remodel it into an equivalent change. Equivalent embodiment. However, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present utility model without departing from the content of the technical solution of the utility model still belong to the protection scope of the technical solution of the utility model. the

Claims (9)

1. the optical detection device attemperating unit of an online application; Comprise the sleeve on base and the base, temperature sensor be installed in the said sleeve and have the inner chamber that photoelectricity testing part is installed that one end of said sleeve is connected with reaction chamber; The other end is provided with gland and carries out the light sealing; It is characterized in that: said upper cartridge is equipped with two chip semiconductor cooling pieces, on the said semiconductor chilling plate heat radiator is housed, and radiator fan is housed on the heat radiator.

2. the optical detection device attemperating unit of a kind of online application according to claim 1; It is characterized in that: two said semiconductor chilling plate surfaces coated are with heat-conducting silicone grease; Said semi-conductive chill surface and said sleeve are adjacent to, and said semi-conductive heating face is adjacent to said heat radiator.

3. the optical detection device attemperating unit of a kind of online application according to claim 1 and 2 is characterized in that: said semiconductor chilling plate and said temperature sensor employing closed loop pid control mode.

4. the optical detection device attemperating unit of a kind of online application according to claim 1 and 2, it is characterized in that: said semiconductor chilling plate specification is the square of 20-30mm.

5. the optical detection device attemperating unit of a kind of online application according to claim 1 and 2, it is characterized in that: said sleeve-shaped is the square-outside and round-inside structure, said sleeve diameter scope is 20-50mm, length range 50-80mm.

6. the optical detection device attemperating unit of a kind of online application according to claim 5, it is characterized in that: the material of said sleeve is an aluminium, the insulation of exposed part parcel is pasted.

7. the optical detection device attemperating unit of a kind of online application according to claim 1 and 2 is characterized in that: said gland and said sleeve are through being threaded, and faying face utilizes O type circle to carry out the light sealing.

8. the optical detection device attemperating unit of a kind of online application according to claim 1 and 2 is characterized in that: on said gland, aviation plug is installed, said aviation plug employing weather proof receptacle.

9. the optical detection device attemperating unit of a kind of online application according to claim 1 and 2, it is characterized in that: two chip semiconductor cooling pieces can be worked simultaneously, or wherein a slice work.

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