Constant-temperature soundproof box for dissolved gas detection unit and detection equipment

Abstract

The utility model relates to the technical field of gas detection, and particularly discloses a constant-temperature soundproof box for a dissolved gas detection unit and detection equipment, the constant-temperature soundproof box comprises a box body, and a detection element for detecting a photoacoustic signal and generating a photoacoustic spectrum is placed in the box body; the insulation board is arranged on the inner wall of the box body in a surrounding manner; the noise reduction plate is arranged on the inner side of the heat preservation plate in a surrounding mode, the noise reduction plate is elastic and comprises a bottom plate, a side plate and a top plate, the top wall of the bottom plate is used for supporting a detection element, and the thickness of the side plate and the thickness of the top plate are both smaller than the thickness of the bottom plate; a plurality of protrusions are arranged on the inner sides of the bottom plate, the side plates and the top plate, and a groove is formed between every two adjacent protrusions. The heat preservation plate and the noise reduction plate are arranged in the box body, so that the influence of environment temperature fluctuation and external noise on the photoacoustic spectrum detection process can be weakened, the signal-to-noise ratio, sensitivity and stability of detection are improved, and the application capability of low-concentration gas analysis is expanded.

Description

Technical Field

[0001] The present application relates to the technical field of gas detection, and in particular to a constant temperature soundproof box for a dissolved gas detection unit. Background Art

[0002] Transformers are core equipment in power systems, and their safe and stable operation is crucial. The insulating oil within transformers decomposes and produces various characteristic gases during long-term operation or when faults such as local overheating or discharge occur. The types and concentrations of these gases are key indicators for determining the type and severity of transformer faults. Early and accurate detection of these gases can provide early warning of faults.

[0003] In order to effectively detect the content of characteristic gases produced by the decomposition of insulating oil inside the transformer, photoacoustic spectroscopy is usually used. Photoacoustic spectroscopy is an analytical technology based on the photoacoustic effect. Its basic principle is that when the sample absorbs modulated light energy, the absorbed light energy is converted into heat energy, causing the local temperature of the sample to rise and fall periodically; this periodic temperature change will cause the medium around the sample, such as gas, to expand and contract periodically, thereby generating sound waves that can be detected by a microphone, namely photoacoustic signals; by analyzing the intensity and frequency of these photoacoustic signals, qualitative and quantitative analysis of the sample composition and concentration can be achieved.

[0004] When the photoacoustic spectrometer is placed directly near the transformer and connected to the transformer oil tank through a pipeline to achieve continuous online monitoring of dissolved gas in the oil, the external ambient temperature and noise can easily affect the detection process, resulting in large fluctuations in the detection signal, increased errors, limited sensitivity and detection limit, and difficulty in accurately detecting the gas content, which is not conducive to achieving early and accurate warning of transformer failures. Utility Model Content

[0005] In order to reduce the impact of ambient temperature and noise on the accuracy of detection, the present application provides a constant temperature soundproof box and detection equipment for a dissolved gas detection unit.

[0006] In a first aspect, the present application provides a constant temperature soundproof box for a dissolved gas detection unit, which adopts the following technical solution:

[0007] A constant temperature soundproof box for a dissolved gas detection unit, comprising a box body, wherein a detection element for detecting a photoacoustic signal and generating a photoacoustic spectrum is placed inside the box body;

[0008] A heat preservation plate is arranged around the inner wall of the box;

[0009] A noise reduction plate is arranged around the inner side of the thermal insulation plate, the noise reduction plate is elastic, and includes a bottom plate, side plates, and a top plate. The bottom plate, side plates, and top plate enclose a cavity for accommodating the detection element. The top wall of the bottom plate is used to support the detection element. The thickness of the side plates and the top plate are both smaller than that of the bottom plate.

[0010] The inner sides of the bottom plate, the side plate and the top plate are all provided with a plurality of protrusions arranged in an array, and a groove is provided between two adjacent protrusions.

[0011] By adopting the above technical solution, the box can provide space for accommodating the detection element, and the insulation board can reduce the impact of the external ambient temperature on the temperature inside the box, so that the detection element is in a relatively stable temperature environment; the noise reduction board adopts elastic sound-absorbing cotton, and the inner side is provided with protrusions and grooves arranged in an array, so that it can effectively absorb external noise and reduce the impact of noise on detection accuracy; because when used outdoors, the box needs to be placed on the ground or platform, the noise has a stronger ability to propagate in solids, and the external noise is more easily transmitted to the bottom wall of the box through the ground or platform. Therefore, when the thickness of the bottom plate is greater than the thickness of the side plate and the top plate, the noise transmitted to the inside of the box through the bottom wall of the box can be reduced, thereby further enhancing the sound insulation effect; furthermore, the detection element is placed on the top wall of the bottom plate inside the box, and the detection element is not in direct contact with the side plate and the top plate, so that the noise and vibration transmitted to the detection element through the side plate and the top plate can be reduced; therefore, the device can effectively reduce the impact of environmental noise and temperature fluctuations on the photoacoustic spectroscopy detection signal in harsh environments, improve the signal-to-noise ratio, sensitivity and stability of the detection, thereby expanding the application capabilities of low-concentration gas analysis.

[0012] Optionally, a temperature control module is provided in the box, and the temperature control module includes a temperature sensor, a controller, a heating unit and a refrigeration unit, and the controller is electrically connected to the temperature sensor, the heating unit and the refrigeration unit respectively.

[0013] By adopting the above technical solution, the temperature inside the box is monitored in real time using a temperature sensor, and the temperature signal is transmitted to the controller. The controller controls the operation of the heating unit or the refrigeration unit according to the received temperature signal, thereby maintaining a constant temperature inside the box and reducing the impact of the ambient temperature on the accuracy of detection.

[0014] Optionally, the refrigeration unit includes an evaporator, a radiator, a fan, a water pump and a water tank, the evaporator is arranged inside the box, and the radiator, fan, water pump and water tank are all arranged outside the box.

[0015] By adopting the above technical solution, water cooling is used for refrigeration, and the water pump, fan and radiator are arranged on the outside of the box. Therefore, while ensuring the cooling effect on the inside of the box, the impact of the noise and vibration generated by the water pump and fan during operation on the detection can be reduced.

[0016] Optionally, two partitions are provided between the base plate and the bottom insulation plate, the two partitions are arranged in parallel and spaced apart, a partition cavity is formed between the two partitions, both partitions are provided with depressions, there are multiple depressions and they are arranged in an array, and the depressions are recessed toward the side where the two partitions are close to each other.

[0017] By adopting the above technical solution, the partition cavity can reduce heat transfer and further enhance the thermal insulation effect; the depressions arranged in an array on the partition are concave toward the side closer to each other, which can increase the sound propagation path and the number of reflections, and improve the sound insulation and noise reduction capabilities.

[0018] Optionally, a connecting piece is provided between the two partitions, and a plurality of the connecting pieces are provided and arranged in an array.

[0019] By adopting the above technical solution, the connecting piece can play an auxiliary supporting role for the two partitions, thereby enhancing the structural stability.

[0020] Optionally, the connecting member includes a connecting column, an insulating cavity is provided inside the connecting column, and an end portion of the connecting column is fixedly connected to the partition.

[0021] By adopting the above technical solution, the conduction effect of heat and sound in the gas medium is weaker than that in the solid medium. Therefore, the setting of the heat insulation cavity can reduce the impact of the setting of the connecting column on the thermal insulation effect and sound insulation effect.

[0022] Optionally, the connecting part includes a connecting pipe and a corrugated hose arranged at both ends of the connecting pipe, the corrugated hose is elastic, and the end of the corrugated hose away from the connecting pipe is fixedly connected to the partition so that a closed insulation cavity is formed between the connecting pipe, the two corrugated hoses and the two partitions.

[0023] By adopting the above technical solution, the interior of the corrugated hose is filled with gas, and the corrugated hose is in a bulging state, thereby being able to provide a certain support effect for the two partitions. In addition, when the vibration caused by the sound wave reaches the partition below, the vibration will first encounter the corrugated hose. Due to the flexibility and elasticity of the corrugated hose, most of the vibration energy will be absorbed, reflected or dissipated, and only a small part can be transmitted to the connecting pipe, thereby weakening the transmission of the vibration caused by the sound wave between the two partitions, weakening the sound bridge effect, and helping to enhance the sound insulation effect.

[0024] When the corrugated hose expands and the internal air pressure increases, its stiffness increases, so when it is subjected to vibrations caused by sound waves, its deformation will be smaller and the efficiency of transmitting vibration will be lower, thereby enhancing the sound insulation ability and more effectively weakening the sound bridge effect; by adjusting the air pressure, the elastic properties of the corrugated hose can also be optimized to provide the best vibration isolation effect within the target frequency range, thereby more effectively weakening the sound bridge effect.

[0025] Optionally, an opening is provided on the side wall of the connecting pipe, and a screw cap is threadedly connected to the opening so that the corrugated hose expands when air is inflated into the connecting pipe through the opening.

[0026] By adopting the above technical solution, after opening the screw cap, air can be inflated into the interior of the connecting pipe through the opening, thereby causing the corrugated hose to bulge and expand, and then the screw cap can be tightened, thereby facilitating the inflation of air into the insulating cavity inside the corrugated hose and the connecting pipe.

[0027] Optionally, one end of the corrugated hose away from the connecting pipe is fixedly connected to a connecting block, and the connecting block is fixedly connected to the partition.

[0028] By adopting the above technical solution, it is convenient to fix the connecting piece between the two partitions.

[0029] In a second aspect, the present application provides a detection device, which adopts the following technical solution:

[0030] A detection device, using any of the above-mentioned constant temperature soundproof boxes, wherein a detection element is arranged in the box, and the noise reduction plate cover is arranged on the outside of the detection element, and the detection element includes a light source, a light modulator, a photoacoustic cell, a microphone, a signal processing unit and a sample processing unit.

[0031] By adopting the above technical solution, an insulation board and a noise reduction board are set on the outside of the detection element, thereby reducing the impact of ambient temperature fluctuations and external noise on the detection results, making the device more accurate and more applicable when used outdoors.

[0032] In summary, this application has the following beneficial technical effects:

[0033] 1. The interior of the box is equipped with insulation panels and noise reduction panels, which can reduce the impact of ambient temperature fluctuations and external noise on the photoacoustic spectroscopy detection process, thereby ensuring the accuracy of the test results.

[0034] 2. The partition cavity between the two partitions can enhance the heat preservation and noise reduction effect of the box. The depressions on the two partitions can increase the sound propagation path and the number of reflections, further improving the sound insulation and noise reduction capabilities.

[0035] 3. The connecting parts include a connecting pipe and a corrugated hose, which form an elastic connection between the two partitions. On the one hand, it can support the two partitions. On the other hand, the elastic structure can absorb and attenuate vibration energy, thereby weakening the transmission ability of sound waves and further improving the sound insulation and noise reduction capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a cross-sectional view of the constant temperature sound insulation box in Example 1 of the present application;

[0037] Figure 2 This is a schematic structural diagram of the constant temperature sound insulation box in Example 1 of the present application with the box cover hidden;

[0038] Figure 3 This is a cross-sectional view of the detection device in Example 1 of the present application with the box cover hidden;

[0039] Figure 4 This is a cross-sectional view of the constant temperature sound insulation box in Example 2 of the present application with the box cover hidden, intended to show the installation positions of the partitions and connectors;

[0040] Figure 5 This is a cross-sectional view of the constant temperature sound insulation box in Example 3 of the present application with the box cover hidden, intended to show the internal structure of the connector;

[0041] Figure 6 yes Figure 5 Enlarged schematic diagram of point A in the middle.

[0042] Figure numerals: 1. Box body; 11. Box body; 12. Box cover; 2. Detection element; 3. Insulation board; 4. Noise reduction board; 41. Bottom plate; 42. Side plate; 43. Top plate; 44. Protrusion; 45. Groove; 5. Partition; 6. Partition chamber; 7. Connecting piece; 71. Connecting column; 72. Connecting pipe; 73. Corrugated hose; 8. Insulation chamber; 9. Screw cap; 10. Connecting block. DETAILED DESCRIPTION

[0043] The following combination Figures 1-6 This application is described in further detail.

[0044] Example 1: This embodiment of the present application discloses a constant temperature soundproof box for a dissolved gas detection unit. Figure 1 、 Figure 2 and Figure 3The constant temperature soundproof enclosure for the dissolved gas detection unit includes an enclosure 1, insulation panels 3, and noise reduction panels 4. The enclosure 1 is a rectangular box consisting of a main body 11 and a lid 12 removably mounted on top. Opening the lid 12 facilitates placement of the detection element 2 within the enclosure 11, ensuring accurate detection. Both the main body 11 and the lid 12 are constructed from a sturdy, highly sealed aluminum alloy shell, effectively preventing external interference such as noise and airflow, thereby enhancing overall isolation.

[0045] Reference Figure 3 The insulation board 3 is fixedly mounted on the inner wall of the box body 1. The insulation board 3 is made of high-efficiency thermal insulation foam, such as closed-cell polyurethane rigid foam. In other embodiments, the insulation board 3 may also be made of aerogel composite board or other materials. The noise reduction board 4 is fixedly mounted on the inner wall of the insulation board 3. The noise reduction board 4 is made of sound-absorbing cotton, so the noise reduction board 4 is elastic. A plurality of protrusions 44 arranged in an array are provided on the inner side of the noise reduction board 4. A groove 45 is provided between two adjacent protrusions 44, and the plurality of grooves 45 are also arranged in an array. Therefore, the reflection and absorption path of the sound can be extended, thereby improving the sound absorption effect. The sound-absorbing cotton can be made of polyester fiber sound-absorbing cotton, which is environmentally friendly and has good sound absorption performance.

[0046] The noise reduction panel 4 comprises a bottom panel 41, side panels 42, and a top panel 43. The bottom panel 41 is horizontally arranged and fixedly connected to the top wall of the insulation panel 3 at the bottom of the box body 1. Four side panels 42 are provided, all arranged vertically and surrounding the bottom panel 41. The top panel 43 is fixed to the insulation panel 3 on the inside of the box cover 12. The top wall of the bottom panel 41 supports the detection element 2. The thickness of the bottom panel 41 is greater than that of the side panels 42 and top panel 43, thereby helping to ensure sound insulation.

[0047] The temperature control module is located within the enclosure 1 and includes a temperature sensor, a controller, a heating unit, and a cooling unit. The temperature sensor monitors the temperature within the enclosure 1 in real time. In this embodiment, a thermocouple temperature sensor is used, offering high measurement accuracy and fast response speed. Alternatively, a thermistor temperature sensor can be used, offering lower cost. The controller is electrically connected to the temperature sensor, heating unit, and cooling unit, respectively. Based on the temperature information fed back by the temperature sensor, the controller controls the operation of the heating and cooling units, thereby ensuring a constant temperature within the enclosure 1.

[0048] The heating unit includes a resistance wire. When the resistance wire is energized and heated, the interior of the housing 1 can be heated. It has a simple structure and high heating efficiency. A ceramic heating plate can also be used, which heats evenly and has a long service life. In this embodiment, the refrigeration unit adopts a water-cooling method. The refrigeration unit includes an evaporator, a radiator, a fan, a water pump and a water tank. Among them, the evaporator is fixedly installed inside the housing 1, so that the cooling water flows into the evaporator and can take away the heat inside the housing 1. The cooling water after absorbing heat flows into the radiator again, and the heat dissipation is accelerated under the action of the fan, and then flows back into the evaporator, thereby realizing the circulation of cooling water and cooling the interior of the housing 1. The water pump, fan, radiator and water tank are all arranged outside the housing 1. Therefore, the noise and vibration of the water pump and fan when working are not easily transmitted to the interior of the housing 1, thereby reducing the influence of the refrigeration unit on the detection results.

[0049] The side walls of the box 1 are also provided with pipeline channels and electrical interfaces, which facilitate the introduction of samples into the detection element 2 inside the box and the supply of power to the detection element 2 inside the box, thereby ensuring the smooth progress of the detection process.

[0050] The implementation principle of Example 1 is as follows: the detection element 2 is placed inside the box 1, and then the box cover 12 is closed, so that the inside of the box 1 is in a closed state. The insulation board 3 reduces the conduction of external heat, maintains the constant internal ambient temperature, and effectively blocks the influence of external temperature changes on the detection results; through the cooperation of the temperature sensor with the heating unit and the refrigeration unit, the real-time monitoring and automatic adjustment of the internal temperature of the box 1 can be realized, and the temperature control accuracy can reach ±0.1°C. The noise reduction board 4 has a complex concave and convex surface structure, which can greatly reduce environmental noise in a wider frequency range, prevent sound waves from directly interfering with the microphone to collect weak photoacoustic signals, thereby reducing the impact of external noise on the internal detection process.

[0051] Reference Figure 3 This embodiment also discloses a detection device, comprising the aforementioned constant temperature and soundproof enclosure and a detection element 2 disposed within the enclosure. A heat insulation board 3 and a noise reduction board 4 are both disposed outside the detection element 2. The detection element 2 includes a light source, a light modulator, a photoacoustic cell, a microphone, a signal processing unit, and a sample processing unit. This allows the detection device to operate in a constant temperature and soundproof environment, improving detection accuracy and stability.

[0052] The light source is a laser light source, which is used to emit light of a specific wavelength. The optical modulator is used to modulate the light emitted by the light source, converting a continuous light beam into a periodically changing modulated light beam. The photoacoustic cell is the core component of photoacoustic spectroscopy detection. The sample absorbs the modulated light energy in the photoacoustic cell and generates a photoacoustic signal. The microphone is used to detect the photoacoustic signal. It can use a capacitive microphone with high sensitivity and a wide frequency response range, or a dynamic microphone with a simple structure and strong anti-interference ability. The signal processing unit processes and analyzes the photoacoustic signal detected by the microphone to obtain information on the composition and concentration of the sample. The signal processing unit uses a single-chip microcomputer with a small size and low cost. The sample processing unit is used to pre-treat the sample and to control the flow, pressure and temperature of the gas sample to be tested entering the photoacoustic cell.

[0053] The working principle of this embodiment is as follows: the detection device utilizes the stable environment provided by the constant temperature and soundproof chamber, enabling detection element 2 to perform detection more accurately. During detection, the sample processing unit introduces the sample into the photoacoustic cell. Light emitted by the light source is modulated by the light modulator and then enters the cell. The sample absorbs the light energy, generating a photoacoustic signal, which is detected by the microphone and transmitted to the signal processing unit for analysis.

[0054] Example 2: Reference Figure 4 This embodiment differs from Example 1 in that, in this embodiment, two partitions 5 are further disposed between the bottom wall of the bottom plate 41 and the insulation board 3 at the bottom of the box body 1. The edges of the partitions 5 are fixedly connected to the inner wall of the insulation board 3 on the peripheral side. The two partitions 5 are arranged in parallel and spaced apart, forming a partition cavity 6 between the two partitions 5. The partition cavity 6 reduces heat transfer between the insulation board 3 and the noise reduction board 4, thereby enhancing the thermal insulation effect. Since the propagation ability of sound in a gaseous medium is weaker than that in a solid medium, the partition cavity 6 also enhances the sound insulation effect.

[0055] Both baffles 5 are provided with multiple depressions arranged in an array, with each depression concave toward the side of the two baffles 5 that approaches each other. When sound waves attempt to pass through the depressions, they no longer simply propagate in a straight line. Instead, the depressions force the sound waves to undergo multiple reflections, refractions, and scattering. This lengthens and complicates the path, forcing the sound waves to overcome more resistance during propagation, and energy is lost with each reflection and scattering, further enhancing the sound insulation effect.

[0056] Connectors 7 are provided between the two partitions 5. Multiple connectors 7 are provided and arranged in an array. In this embodiment, connectors 7 include connecting posts 71. Connecting posts 71 are made of a plastic material, such as polypropylene, which provides excellent thermal insulation. The ends of connecting posts 71 are fixedly connected to the adjacent sides of the two partitions 5. Connecting posts 71 support the two partitions 5, thereby ensuring the stability of the partitions 5 and the partition chamber 6. Furthermore, an insulating chamber 8 is provided within connecting posts 71 to reduce heat transfer.

[0057] It should be noted that the edges of the partitions 5 are fixedly connected to the insulation board 3, thus supporting the partitions 5 through the insulation board 3 and ensuring the stability of the partitions 5 in their installation position. The partitions 5 are relatively thin and therefore lightweight; the connectors 7 provide additional support, further enhancing the stability of the partitions 5 and ensuring the stability of the partition chamber 6 between the two partitions 5. Due to the thinness of the partitions 5, the sound insulation and thermal insulation effects are enhanced without significantly increasing the volume of the box 1.

[0058] The implementation principle of Example 2 is as follows: two partitions 5 are arranged between the insulation board 3 and the noise reduction board 4, and a partition cavity 6 is formed between the two partitions 5, thereby enhancing the insulation and sound insulation effects; the two partitions 5 are supported by multiple connecting columns 71, thereby ensuring the overall strength, thereby ensuring the stability of the partitions 5 and the partition cavity 6; an insulating cavity 8 is provided inside the connecting column 71, which can further reduce the transferred heat.

[0059] Example 3: Reference Figure 5 and Figure 6 This embodiment differs from Example 2 in that the connector 7 in this embodiment includes a connecting tube 72 and corrugated hoses 73 disposed at both ends of the connecting tube 72. The connecting tube 72 is made of a plastic tube, which is lightweight and poorly conductive to heat. The corrugated hose 73 is made of rubber, which has good elasticity and sealing properties, but poor thermal conductivity. The corrugated hose 73 is elastic and can bulge radially when inflated. The end of the corrugated hose 73 away from the connecting tube 72 is fixedly connected to the partition 5, thereby forming a sealed insulating cavity 8 between the connecting tube 72, the two corrugated hoses 73, and the two partitions 5.

[0060] The sidewall of the connecting tube 72 is provided with an opening, to which a screw cap 9 is threadedly connected. Opening the screw cap 9 facilitates the inflating of the connecting tube 72, causing the bellows 73 to swell and expand. Tightening the screw cap 9 then seals the opening in the connecting tube 72, thereby maintaining the bellows 73 in an inflated state and preventing the gas inside from escaping. Furthermore, a one-way valve can be provided at the opening to facilitate inflating the interior of the connecting tube 72. When inflation is stopped, the gas inside the connecting tube 72 and the bellows is unlikely to escape, thereby reducing the amount of gas that leaks out during the tightening of the screw cap 9.

[0061] One end of the corrugated hose 73 away from the connecting pipe 72 is fixedly connected to a connecting block 10, and the connecting block 10 is fixedly connected to the partition 5. The connecting block 10 is made of plastic and is connected to the partition 5 by gluing or screwing. Therefore, after the inflation process into the corrugated hose 73 is completed, the connecting piece 7 can be moved between the two partitions 5, and then the connecting piece 7 is fixedly connected to the partition 5, thereby facilitating the installation process of the connecting piece 7.

[0062] The two partitions 5 are connected by a bellows 73 and a connecting tube 72. Normally, the bellows 73 is inflated, providing some support between the two partitions 5. The bellows 73 and connecting tube 72 are filled with gas, which reduces the transmission of heat and noise. Because the bellows 73 are flexible and elastic, they together form an elastic isolation layer. When sound waves cause the partition 5 below to vibrate, the vibrations first encounter the bellows 73. Due to the bellows' flexibility and elasticity, most of the vibration energy is absorbed, reflected, or dissipated, leaving only a small portion transmitted to the connecting tube 72, thereby reducing the transmission of vibration energy and further enhancing the sound insulation effect.

[0063] The above are optional embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A constant temperature soundproof box for a dissolved gas detection unit, characterized in that: include: A housing (1), wherein a detection element (2) for detecting a photoacoustic signal and generating a photoacoustic spectrum is placed inside the housing (1); A heat-insulating plate (3) is arranged around the inner wall of the box (1); A noise reduction plate (4) is arranged around the inner side of the heat-insulating plate (3), the noise reduction plate (4) is elastic, and comprises a bottom plate (41), a side plate (42) and a top plate (43), wherein the bottom plate (41), the side plate (42) and the top plate (43) enclose a cavity for accommodating the detection element (2), the top wall of the bottom plate (41) is used to support the detection element, and the thickness of the side plate (42) and the top plate (43) are both smaller than the thickness of the bottom plate (41); The inner sides of the bottom plate (41), the side plate (42) and the top plate (43) are all provided with a plurality of protrusions (44) arranged in an array, and a groove (45) is provided between two adjacent protrusions (44).

2. A constant temperature soundproof box for a dissolved gas detection unit according to claim 1, characterized in that: A temperature control module is provided in the box (1), and the temperature control module comprises a temperature sensor, a controller, a heating unit and a refrigeration unit, and the controller is electrically connected to the temperature sensor, the heating unit and the refrigeration unit respectively.

3. A constant temperature soundproof box for a dissolved gas detection unit according to claim 2, characterized in that: The refrigeration unit comprises an evaporator, a radiator, a fan, a water pump and a water tank; the evaporator is arranged inside the box body (1); and the radiator, fan, water pump and water tank are all arranged outside the box body (1).

4. A constant temperature soundproof box for a dissolved gas detection unit according to claim 1, characterized in that: Two partitions (5) are provided between the bottom plate (41) and the insulation plate (3) at the bottom. The two partitions (5) are arranged in parallel and spaced apart. A partition cavity (6) is formed between the two partitions (5). Both partitions (5) are provided with a recess. A plurality of recesses are provided and arranged in an array. The recesses are recessed toward the side where the two partitions (5) are close to each other.

5. A constant temperature soundproof box for a dissolved gas detection unit according to claim 4, characterized in that: A connecting piece (7) is provided between the two partitions (5), and a plurality of the connecting pieces (7) are provided and arranged in an array.

6. A constant temperature soundproof box for a dissolved gas detection unit according to claim 5, characterized in that: The connecting member (7) comprises a connecting column (71), a heat-insulating cavity (8) is provided inside the connecting column (71), and an end portion of the connecting column (71) is fixedly connected to the partition (5).

7. The constant temperature soundproof box for a dissolved gas detection unit according to claim 5, characterized in that: The connecting member (7) comprises a connecting pipe (72) and a corrugated hose (73) provided at both ends of the connecting pipe (72). The corrugated hose (73) is elastic. One end of the corrugated hose (73) away from the connecting pipe (72) is fixedly connected to the partition (5), so that a sealed heat-insulating cavity (8) is formed between the connecting pipe (72), the two corrugated hoses (73) and the two partitions (5).

8. The constant temperature soundproof box for a dissolved gas detection unit according to claim 7, characterized in that: An opening is provided on the side wall of the connecting pipe (72), and a screw cap (9) is threadedly connected to the opening so that the corrugated hose (73) expands when air is inflated into the connecting pipe (72) through the opening.

9. A constant temperature soundproof box for a dissolved gas detection unit according to claim 8, characterized in that: One end of the corrugated hose (73) away from the connecting pipe (72) is fixedly connected to a connecting block (10), and the connecting block (10) is fixedly connected to the partition (5).

10. A detection device using the constant temperature sound insulation box according to any one of claims 1 to 9, characterized in that: A detection element (2) is provided in the box (1), and the noise reduction plate (4) is provided on the outside of the detection element (2). The detection element (2) includes a light source, a light modulator, a photoacoustic cell, a microphone, a signal processing unit, and a sample processing unit.

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