WO2022120990A1

WO2022120990A1 - Dew point sensor

Info

Publication number: WO2022120990A1
Application number: PCT/CN2020/139405
Authority: WO
Inventors: 张宾; 何伟生; 陈新准; 马鹏飞; 邱国财; 刘新雅; 郑晓银; 刘光亮; 林惠庭; 李修龙
Original assignee: 广州奥松电子有限公司
Priority date: 2020-12-07
Filing date: 2020-12-25
Publication date: 2022-06-16
Also published as: CN112268930A; CN112268930B

Abstract

A dew point sensor, comprising a dew formation system, a photoelectric detection system, a heat dissipation system, and a control system; the heat dissipation system comprises a heat dissipation base (109); an auxiliary chamber (1092) is provided at the upper end of the heat dissipation base (109), and a main chamber (1091) is provided at the lower end of the heat dissipation base (109); the auxiliary chamber (1092) extends downwardly from the upper surface of the heat dissipation base (109) to the main chamber (1091); and the main chamber (1091) is filled with a sealant, so as to seal the main chamber (1091) and isolate the gas outside the main chamber (1091). By means of improvements on the dew formation system, the occupied space of the dew formation system is simplified, the sealing performance of the dew condensation system is improved, and damage to the dew point sensor caused by water vapor infiltration is prevented. The detection accuracy of the dew point sensor is improved by means of improvements on the photoelectric detection system. By means of improvements on the heat dissipation system, the air tightness of the dew point sensor is improved, and toxic or corrosive gas in an operation environment can be prevented from leaking out to the outside to endanger the lives of workers.

Description

a dew point sensor

technical field

The present invention relates to the technical field of dew condensation measurement, and more particularly, to a dew point sensor.

Background technique

In the operating environment of natural gas, metallurgy, health quarantine, toxic or corrosive gas, etc., the water vapor in the gas has an important impact on the operation. At present, the dew point temperature of the gas is often detected by a dew point sensor, thereby indirectly measuring the humidity in the gas.

Dew point sensors can be classified into various types according to the cooling method and detection control method used. The dew point sensor can use a thermoelectric cooler (Peltier element) to cool the dew layer sensor, so that the water vapor in the gas condenses on the dew layer sensor, resulting in dew or frost, and at the same time, the signal collected by the receiver is passed through the automatic control circuit to make the dew point sensor. The dew or frost on the layer sensor is in equilibrium with the water vapor in the gas, and then use the thermometer to accurately measure the temperature of the dew layer sensor, that is, the temperature of the dew or frost layer, so as to obtain the dew point temperature of the gas, and thus indirectly measure the gas humidity in. The exposed layer sensor includes components such as mirror surface and light-emitting tube, receiving tube or surface acoustic wave device.

The dew point temperature of the gas is to cool the water vapor in the gas under the condition of equal pressure until the condensed phase appears, and then by controlling the temperature of the dew layer of the dew layer sensor, the water vapor in the gas and the flat surface of water or ice are in thermodynamic equilibrium. At this time, the temperature of the dew layer is the dew point temperature of the gas.

In the prior art, the dew point sensor is composed of a heat dissipation system, a thermoelectric refrigeration system, a precision temperature measuring resistance, a photoelectric detection, a mirror surface and other components. In practical applications, the dew point sensor has corresponding requirements for its size, adaptability to dust pollution environment, measurement temperature difference limit, sealing resistance to gas pressure, corrosion resistance, etc.

Conventional dew point sensors use Kovar alloys as heat dissipation components, but Kovar alloys have relatively poor thermal conductivity and poor heat dissipation performance, resulting in a low measurement temperature difference limit and inaccurate temperature measurement results.

The conventional dew point sensor uses copper as the mirror surface, which has poor anti-pollution ability and is easy to be scratched. The surface of the mirror surface is dirty and scratched, which will reduce the detection accuracy and is not conducive to long-term use.

The conventional dew point sensor has poor sealing performance. When the humidity of the gas is detected, the water vapor in the working environment condenses on the dew layer of the dew sensor, and some water vapor penetrates into the dew point sensor, which will affect the dew point sensor. Internal circuits and other components are damaged, reducing the service life of the dew point sensor.

The conventional dew point sensor has poor sealing performance. When testing the working environment containing toxic or corrosive gases, the toxic or corrosive gas will leak out of the working environment through the dew point sensor, posing a threat to the life safety of the staff.

technical problem

The present invention aims to overcome the defect of the above-mentioned poor sealing performance of the dew point sensor in the prior art, and provides a dew point sensor, which is used for improving the air tightness of the dew point sensor, avoiding toxic or corrosive leakage from the working environment to the outside world through the dew point sensor, and preventing the dew point sensor from leaking to the outside world. Threats to the safety of staff.

technical solutions

The technical solution adopted by the present invention is to provide a dew point sensor, which includes a control system, a dew condensation system, a photoelectric detection system, and a heat dissipation system, and has a heat dissipation seat; the upper end of the heat dissipation seat is provided with an auxiliary cavity, and the lower end of the heat dissipation seat is provided with an auxiliary cavity. There is a main cavity; the auxiliary cavity is downwardly connected to the main cavity from the upper surface of the heat sink; the control system includes a control adapter board and an electrical pin, and the control adapter board is located in the In the main cavity, the electrical pins are inserted into the main cavity through the auxiliary cavity and connected to the control adapter board, and the control adapter board is connected to the remote control host; wherein, the control The adapter board is electrically connected to the photoelectric detection system and the dew condensation system through the electrical pins; the main cavity is filled with a sealant, so that the main cavity is sealed and isolated from the gas outside the main cavity.

In this solution, the electrical pins are inserted into the main cavity and the auxiliary cavity and are electrically connected to the control adapter board, so that the circuits of the dew point sensor are concentrated in the main cavity and the heat sink. In the auxiliary cavity, avoid the circuit from being exposed to the outside of the dew point sensor, thereby affecting the detection effect and causing damage to the circuit. Furthermore, the main cavity is filled with a sealant, which is arranged in such a way that the electrical pins and the heat sink can be insulated and connected, so as to prevent the electrical pins and the heat sink from conducting electricity. Furthermore, the sealant seals the main cavity to prevent external water vapor from penetrating into the dew point sensor and causing damage to the circuit inside the dew point sensor. Not only that, the sealant fixes the electrical pins and the control adapter board, so as to prevent the connection between the electrical pins and the control adapter board from being misaligned, resulting in failure of smooth detection. More importantly, the sealant seals the main cavity to seal and isolate the external gas, improve the air tightness of the dew point sensor, and avoid toxic or corrosive leakage from the operating environment through the dew point sensor to the outside world, which is harmful to the life of the staff. security poses a threat.

Preferably, the auxiliary cavity is filled with a sealant, so as to connect the electrical pin and the heat sink in an insulating manner. In this solution, since the auxiliary cavity is small, the electrical needle is easy to contact with the auxiliary cavity when it is accommodated, so that the heat sink is conductive. Therefore, the auxiliary cavity is filled with a sealant, so that the electrical needle is Insulated connection with the heat sink.

Preferably, a part of the structure of the electrical needle is exposed on the upper surface of the heat sink. This solution is arranged in such a way that it is convenient to connect to the dew condensation system and the photoelectric detection system through the structure in which the electrical pins are exposed on the upper surface of the heat sink.

Preferably, the heat dissipation base is provided with a concave cavity below the main cavity; the heat dissipation system further includes a heat dissipation tail cover; the concave cavity is matched with the heat dissipation tail cover; the control adapter board is installed on the on the heat dissipation tail cover; wherein, after the heat dissipation tail cover and the cavity are installed, the control adapter board is located in the main cavity.

Preferably, the outer side of the heat dissipation seat is formed with a connection structure which is matched and connected with the detection port of the external detection pipe. In this solution, the dew point sensor has a wide range of applications, and can be applied to a pipeline working environment, such as a natural gas pipeline. After the connection structure is matched and connected with the detection port of the external detection pipe, the dew condensation system of the dew point sensor is located in the detection pipe, so as to facilitate detection. As can be seen from the foregoing, the main cavity of the dew point sensor is filled with the sealant, which can seal the internal environment of the heat dissipation system of the dew point sensor and prevent toxic or corrosive gases from leaking to the outside world.

Preferably, the dew condensation system is arranged on the upper surface of the heat sink, and the photoelectric detection system includes a photoelectric detection device and a detection cover; the lower surface of the detection cover is recessed upward to remove part of the structure, and the detection cover A detection cavity is formed between the side wall and the top of the detection cover; the photoelectric detection device is installed on the top of the detection cover; wherein, after the detection cover is installed on the heat sink, the junction A dew system is located within the detection chamber. Compared with the prior art, the solution is provided with a detection cavity, which can avoid the influence of airflow fluctuations on the detection results, resulting in inaccurate detection results.

Preferably, the dew condensation system has a mirror surface; the side wall of the detection cover is provided with an air hole, and the air hole communicates with the detection cavity; after the detection cover is installed, the lower end of the air hole is roughly connected to the The upper surface of the mirror surface is flush. In this solution, the mirror surface is the dew condensation place of the dew point sensor. In this solution, after the airflow enters the detection cavity, it can directly contact the upper surface of the mirror surface, and the fluctuation of the airflow in the detection cavity is small, which can make the detection result more accurate.

Preferably, the dew condensation system includes a cooling fin, the upper surface of which is a cooling surface, the lower surface is a heat dissipation surface, and the heat dissipation surface is connected to the upper surface of the heat dissipation base; a heat conduction structure, the lower surface of which is connected to the cooling surface The mirror surface is connected to the upper surface of the heat conduction structure to transfer the cooling energy of the cooling surface to the upper surface of the heat conduction structure; the lower surface of the mirror surface is connected to the upper surface of the heat conduction structure to transfer the cooling energy of the upper surface of the heat conduction structure. to the upper surface of the mirror surface, so that the water vapor in the working environment condenses on the upper surface of the mirror surface to form condensate; the thermometer is embedded in the heat conduction structure. In this solution, the cooling energy generated by the cooling surface of the cooling sheet is transmitted to the upper surface of the mirror surface through the heat conduction structure, so that the water vapor in the working environment condenses on the upper surface of the mirror surface, and then the temperature is measured The meter detects the temperature of the heat-conducting structure, thereby indirectly detecting the temperature of the mirror surface, that is, detecting the dew point temperature of the gas. The heat dissipation surface is connected to the upper surface of the heat dissipation base, so that the heat generated by the heat dissipation surface is dissipated from the heat dissipation base.

In this solution, the dew condensation system is used to generate cooling energy, so that the water vapor in the working environment condenses on the mirror surface to form condensate. The photoelectric detection system detects the thickness of the condensate on the mirror surface by utilizing the change of the light intensity reflected by the mirror surface. The condensate refers to dew or frost condensed on the mirror surface. The heat sink is used to dissipate the heat generated by the dew point sensor during operation. The main cavity is used for accommodating the control adapter board.

In this scheme, the cooling plate in the dew condensation system is used for cooling. When the temperature of the upper surface of the mirror surface drops below the dew point temperature of the gas, the upper surface of the mirror surface starts to condense. Under the control of the control system, the photoelectric detection system The thickness of the condensate on the upper surface of the mirror is detected, and the detected thickness information of the condensate is fed back to the control system. Under the control of the control system, the cooling power of the cooling sheet is adjusted so that the temperature of the mirror surface is consistent with the dew point temperature of the gas.

Compared with the prior art, the thermometer is embedded in the heat-conducting structure, so that the total occupied space of the thermometer and the heat-conducting structure is maintained within the range of the space occupied by the heat-conducting structure, and the thermometer does not increase the occupied space. Compared with the prior art, the heat conduction component of the dew point sensor is divided into three parts: a cooling sheet, a heat conduction structure and a mirror surface, which can reduce the volume of the dew condensation system, thereby improving the response speed of the dew point sensor and avoiding Loss of cooling performance.

Preferably, the dew condensation system further includes a sealing ring, the sealing ring has an accommodating cavity communicating with the upper and lower surfaces, the accommodating cavity is built with the mirror surface, the heat conducting structure, the thermometer, and the sealing A ring wraps around the mirror surface. Compared with the prior art, in this solution, a sealing ring is used to wrap the periphery of the mirror surface to prevent water vapor from infiltrating into the dew point sensor through the dew condensation system, thereby causing damage to the circuits and components inside the dew point sensor. At the same time, the sealing ring surrounds the heat-conducting structure to surround the heat-conducting structure, so as to avoid damage to the heat-conducting structure caused by water vapor, and also prevent water vapor from penetrating into the dew point sensor through the heat-conducting structure.

Preferably, the mirror surface is a silicon wafer; and or, the mirror surface is a silicon wafer, and the outer surface of the mirror surface is provided with a platinum layer, a gold layer or a rhodium layer; and/or, the mirror surface is a silicon wafer, and its The outer surface is provided with a platinum layer, a gold layer or a rhodium layer, and a hydrophobic material coating is provided on the upper surface of the platinum layer, the gold layer or the rhodium layer. In this solution, the mirror surface is a silicon wafer, the surface of which is smooth and bright and has high thermal conductivity. In addition, the outer surface of the mirror surface is provided with a platinum layer or a gold layer or a rhodium layer and a hydrophobic material coating, which can improve the anti-fouling ability of the mirror surface, and make the mirror surface less likely to be scratched, thereby avoiding adverse effects on detection accuracy.

beneficial effect

The invention sets up a condensation system, a photoelectric detection system, and a heat dissipation system, and optimizes each system. By improving the condensation system, the space occupied by the condensation system is simplified and the sealing performance of the condensation system is improved. The dew point sensor is prevented from being damaged due to infiltration of water vapor; the detection accuracy of the dew point sensor is improved through the improvement of the photoelectric detection system; the air tightness of the dew point sensor is improved through the improvement of the heat dissipation system It can prevent toxic or corrosive gases in the operating environment from leaking out of the outside world, threatening the lives of workers.

Description of drawings

Figure 1 is an exploded view of the present invention.

Figure 2 is an exploded view of the condensation system.

Fig. 3 is a structural diagram of a dew condensation system.

4 is a cross-sectional view of the present invention.

FIG. 5 is a structural diagram of the heat sink 109 .

6 is a cross-sectional view of a part of the structure of the present invention.

Reference numerals: detection upper cover 100, photoelectric detection device 101, detection cover 102, air hole 1021, mirror surface 103, sealing ring 104, heat conduction structure 105, thermometer 106, refrigeration sheet 107, electrical needle 108, heat sink 109, The main cavity 1091 , the auxiliary cavity 1092 , the concave cavity 1093 , the connection structure 1094 , the control adapter plate 110 , the aviation joint 111 , the heat dissipation tail cover 112 , and the mounting post 1121 .

Embodiments of the present invention

The accompanying drawings of the present invention are only used for exemplary illustration, and should not be construed as limiting the present invention. In order to better illustrate the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, which do not represent the size of the actual product; for those skilled in the art, some well-known structures and their descriptions in the drawings may be omitted. understandable.

As shown in FIG. 1 , this embodiment provides a dew point sensor, which includes a dew condensation system, a photoelectric detection system, a heat dissipation system, and a control system.

Wherein, as shown in FIG. 2 and FIG. 3 , the dew condensation system includes a mirror surface 103 , a sealing ring 104 , a heat conduction structure 105 , a thermometer 106 , and a cooling sheet 107 . The dew condensation system is installed on the cooling system. The specific working process of the dew condensation system is as follows: the cooling sheet 107 generates cooling capacity through the principle of thermoelectric cooling, and the cooling capacity generated by the cooling sheet 107 is transferred to the upper surface of the mirror surface 103 through the heat conducting structure 105, so that the water in the working environment can be cooled. The vapor condenses on the upper surface of the mirror surface 103 to form condensate. The dew condensation system then detects the temperature of the heat-conducting structure 105 through the thermometer 106, thereby indirectly detecting the temperature of the mirror surface 103, thereby indirectly obtaining the humidity of the gas.

Specifically, the cooling sheet 107 has a cooling surface and a heat dissipation surface, the upper surface of the cooling sheet 107 is a cooling surface, and the lower surface thereof is a heat dissipation surface. In detail, the cooling sheet 107 may have a three-layer structure, but is not limited to a three-layer structure.

In an application embodiment, the cooling sheet 107 adopts a cooling sheet having a three-layer structure, and the cross-sectional area of the structure of the uppermost layer of the cooling sheet 107 is smaller than that of the structures of other layers.

Specifically, the heat-conducting structure 105 is used to transmit the cooling energy from the cooling surface of the cooling sheet 107 . In detail, the heat-conducting structure 105 has an upper surface and a lower surface, and the lower surface of the heat-conducting structure 105 is connected with the cooling surface, so as to transfer the cooling energy of the cooling surface to the upper surface of the heat-conducting structure. In detail, in order to reduce the volume of the thermally conductive structure 105 , the thermally conductive structure 105 is generally in the shape of a rectangular parallelepiped. In detail, in order to reduce the volume of the dew condensation system, further improvements are made to the heat-conducting structure 105. The heat-conducting structure 105 is recessed from the side surface, the upper surface and the lower surface to remove part of the structure to form an open area. 106 is embedded in the open area. In detail, the open area is generally in the shape of a rectangular parallelepiped. In detail, the thermally conductive structure 105 may be made of thermally conductive metal, preferably copper.

In an application embodiment, in order to further accommodate the thermometer 106, the thermally conductive structure 105 is further improved. The thermally conductive structure 105 is recessed from its outer wall to form a groove, and the thermometer 106 is embedded in the groove. and match the grooves.

Specifically, the mirror surface 103 is the dew condensation place of the dew condensation system. The lower surface of the mirror surface 103 is connected to the upper surface of the thermally conductive structure 105 to transfer the cooling energy from the upper surface of the thermally conductive structure 105 to the upper surface of the mirror surface 103, so that the water vapor in the working environment is condensed on the mirror surface The upper surface of 103 forms condensate. In detail, in order to improve the thermal conductivity, the mirror surface 103 is a silicon wafer, and the cross section of the silicon wafer is generally square. In detail, in order to improve the anti-fouling ability of the mirror surface and make the mirror surface not easy to be scratched, a platinum layer or a gold layer or a rhodium layer and a hydrophobic material coating are provided on the outer surface of the mirror surface 103. Further, the The platinum layer, the gold layer or the rhodium layer is arranged on the upper surface of the mirror surface 103, and the hydrophobic material coating is arranged on the upper surface of the platinum layer, the gold layer or the rhodium layer.

Specifically, the thermometer 106 is used for temperature measurement. In detail, the thermometer 106 is generally in the shape of a rectangular parallelepiped, and the thermometer 106 is matched with the open area. In detail, the thermometer is a platinum resistor. In order to further increase the heat conduction area, the outer surface of the platinum resistor is provided with a thermally conductive silicone grease layer or a thermally conductive adhesive layer, so that the thermometer 106 and the thermally conductive structure are pasted without gaps. tight.

Specifically, in order to prevent water vapor from infiltrating into the dew point sensor through the dew condensation system, a sealing ring 104 is used for sealing in this embodiment of the present application. The sealing ring 104 has an accommodating cavity communicating with the upper and lower surfaces. In detail, the sealing ring 104 is generally in the shape of a trapezoid table. In detail, the heat conduction structure 105 , the mirror surface 103 , and the thermometer 106 are all enclosed in the sealing ring 104 , that is, the heat conduction structure 105 , the mirror surface 103 , and the thermometer 106 are all located in the accommodating cavity. In detail, there is a certain distance between the upper surface of the sealing ring 104 and the lower surface thereof, and the lower end of the sealing ring 104 is enclosed by the upper end of the refrigeration sheet 107 . In detail, the lower end of the sealing ring 104 is wrapped around the periphery of the uppermost structure of the cooling sheet 107 . In detail, in order to locate the water vapor condensed on the upper surface of the mirror surface 103 in the area where the upper surface of the mirror surface 103 is located, the upper surface of the sealing ring 104 has a certain distance from the upper surface of the mirror surface 103 , and the upper surface of the sealing ring 104 has a certain distance. The surface is higher than the upper surface of the mirror surface 103 . In detail, in order to further improve the air tightness of the dew condensation system, the sealing ring 104 is closely connected with the mirror surface 103 , and the sealing ring 104 may be a rubber sealing ring.

Wherein, as shown in FIG. 1 , the photoelectric detection system includes a photoelectric detection device 101 and a detection cover 102 .

Specifically, the photoelectric detection device 101 is composed of an LED emitting light source and a photosensitive receiving tube, and the thickness of the condensate is measured by detecting the change of the light intensity reflected by the dew condensation specular surface through the LED emitting light source and the photosensitive receiving tube.

Specifically, after the lower surface of the detection cover 102 is recessed upward to remove part of the structure, a detection cavity is formed between the side wall and the top of the detection cover 102 . In detail, the photodetection device 101 is located at the upper end of the detection cavity. It can be said that the photodetection device 101 is installed on the top of the detection cover. After the detection cover 102 is installed on the heat dissipation system, the dew condensation system is located in the detection cavity. In detail, in order to facilitate the installation of the photoelectric detection device 101 on the upper end of the detection cover 102 , the upper end of the detection cover 102 is provided with a detection cover 100 , and the detection cover 100 is detachably mounted on the detection cover 102 . In detail, the side wall of the detection cover 102 is provided with an air hole 1021, and the air hole 1021 communicates with the detection cavity. In order to further improve the detection accuracy, after the detection cover 102 is installed, the lower end of the air hole 1021 is approximately flush with the upper surface of the mirror surface 103 .

Wherein, as shown in FIG. 4 , FIG. 5 , and FIG. 6 , the heat dissipation system includes a heat dissipation base 109 and a heat dissipation tail cover 112 .

Specifically, the heat sink 109 is generally cylindrical. The upper surface of the heat dissipation base 109 is connected to the heat dissipation surface of the cooling fin 107 of the dew condensation system, so as to dissipate the heat generated by the heat dissipation surface through the heat dissipation base 109 . In detail, in order to facilitate heat dissipation, the heat dissipation seat 109 may be formed of a metal material. In detail, the upper end of the heat sink 109 is provided with an auxiliary cavity 1092, and the lower end thereof is provided with a main cavity 1091. The main cavity 1091 is disposed at the lower end of the heat sink 109 , and is formed by the lower surface of the heat sink 109 being recessed upward to remove part of the structure. The auxiliary cavity 1092 is a through hole, and the through hole is communicated downward from the upper surface of the heat sink 109 to the main cavity 1091 . Specifically, the dew condensation system is arranged on the upper surface of the heat sink 109 , that is, the heat dissipation surface of the cooling sheet 107 is connected to the upper surface of the heat sink 109 , so that the heat sink 109 can dissipate the heat generated by the heat sink.

In detail, the outer side of the heat sink 109 is formed with a connection structure that is matched with the detection port of the external detection pipe. The connection structure 1094 can be a thread or a protrusion. The connection structure 1094 can be specifically based on the structure of the detection port. to set.

In an application embodiment, a thread is formed on the outer side of the heat dissipation seat 109, and the heat dissipation seat 109 is connected with the detection port through the thread to achieve sealing and avoid leakage of the gas installed in the external detection pipe.

Specifically, the heat dissipation tail cover 112 is mounted on the lower end of the heat dissipation base 109 , and the heat dissipation tail cover 112 can be connected to the heat dissipation base 109 by means of threads. In detail, the heat dissipation tail cover 112 has mounting posts 1121 .

In an application embodiment, as shown in FIG. 5 , the heat sink 109 is further provided with a concave cavity 1093 below the main cavity 1091 . The cavity 1093 is matched with the heat dissipation tail cover 112 .

The control system includes electrical pins 108 , a control adapter board 110 , an aviation connector 111 , and a remote control host. The remote control host is not shown in the figure.

Specifically, the control adapter board 110 is located in the main cavity 1191 . In detail, the control adapter plate 110 is disposed on the mounting post 1121 . The aviation connector 111 is disposed on the mounting post 1121 , between the heat dissipation tail cover 112 and the control adapter board 110 , and is connected to the control adapter board 110 . Specifically, after the heat dissipation tail cover 112 and the cavity 1093 are installed, the aviation connector 111 and the control adapter board 110 are both located in the main cavity 1091 . In detail, the aviation connector 111 is also connected to the remote control host, so that the remote control host can exchange information with the dew point sensor. Through the remote control host, the current detection state and corresponding parameters can be observed through the screen provided by the remote control host, and the detection parameters can be set through the external control host.

Specifically, the electrical pins 108 are used for electrical conduction. In detail, the electrical needles 108 are made of conductive metal, and several of them are provided. The sizes of the electrical needles 108 can be set to be the same or different. In detail, the electrical needle 108 is inserted into the main cavity 1091 through the auxiliary cavity 1092 . When the electrical pins 108 are inserted into the main cavity 1091 , the electrical pins 108 are inserted into the main cavity 1091 and are electrically connected to the control adapter board 110 . The electrical pins 108 can be connected to the control adapter board 110 by soldering. In addition, the electrical pin 108 can also be electrically connected to the photoelectric detection system and the dew condensation system through a cable. In detail, the electrical needles 108 are distributed outside the dew condensation system. In detail, the aviation connector 111 can also be connected to the electrical pin 108 .

Specifically, in order to prevent water vapor and air from entering and causing damage to the internal circuits and components of the dew point sensor, to prevent toxic gases from leaking to the outside through the main cavity 1091, to avoid electrical conduction between the electrical needle 108 and the heat sink 109, and to avoid the electrical needle 108 and control switching The connection between the boards 110 is misaligned. In this embodiment of the present application, a sealant is filled in the main cavity 1091 of the heat dissipation system. In order to insulately connect the electrical pins 108 and the heat sink 109 , the auxiliary cavity 1091 is filled with a sealant. In detail, the sealant may be glue, and the glue may include epoxy resin. The main cavity 1091 and the auxiliary cavity 1092 are filled with epoxy resin and a corresponding curing agent. After the epoxy resin is solidified, the main cavity 1091 and the auxiliary cavity 1092 form a sealed environment.

In an application embodiment, in order to prevent the electrical pins 108 and the heat sink 109 from conducting electricity, an insulating pad may be provided on the inner wall of the main cavity 1091, and the insulating pad may be a rubber pad.

In one application embodiment, the electrical pins 108 and the control adapter board 110 may be fixed by a glass frit process.

In one application embodiment, the sealing between the electrical pins 108 and the heat sink 109 may be resistant to gas pressure through a glass sintering process.

The specific working process of the dew point meter is as follows: when the water vapor in the working environment passes through the detection cavity, it sweeps over the upper surface of the mirror surface 103 . When the temperature of the upper surface of the mirror surface 103 is higher than the dew point temperature of the gas, the upper surface of the mirror surface 103 is in a dry state. At this time, under the control of the control system, the photoelectric detection device 101 transmits a signal to the remote control host through the switching control board 110 and the aviation connector 111, and receives the feedback signal from the remote control host, and the feedback signal is compared by the control loop. , and after amplification, the cooling sheet 107 is driven to perform cooling. When the temperature of the upper surface of the mirror surface 103 drops below the dew point temperature of the gas, the upper surface of the mirror surface 103 begins to condense to form condensate. At this time, the photoelectric detection device 101 continues to transmit signals through the switching control board 110 and the aviation connector 111 to Remote control the host, and receive the feedback signal from the remote control host. According to the change of the feedback signal, the feedback signal is compared and amplified by the control loop to adjust the excitation current of the refrigeration sheet 107, that is, to adjust the refrigeration power of the refrigeration sheet 107. The temperature of the upper surface of the mirror surface 103 corresponds to the dew point temperature of the gas. At this time, the temperature of the mirror surface 103 can be detected by the thermometer 106 to obtain the dew point or frost point in the gas.

Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principle of the claims of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

A dew point sensor includes a control system, a dew condensation system, and a photoelectric detection system; it is characterized in that it also includes

A heat dissipation system is provided with a heat dissipation seat (109); the upper end of the heat dissipation seat (109) is provided with an auxiliary cavity (1092), and the lower end thereof is provided with a main cavity (1091); the auxiliary cavity (1092) consists of The upper surface of the heat dissipation seat (109) is communicated downward to the main cavity (1091);

The control system includes a control adapter board (110), an electrical pin (108), and a remote control host, wherein the control adapter board (110) is located in the main cavity (1091), and the electrical pin (108) ) is inserted into the main cavity (1091) through the auxiliary cavity (1092) and connected to the control adapter board (110), and the control adapter board (110) is connected to the remote control host ;

Wherein, the control adapter board (110) is electrically connected to the photoelectric detection system and the dew condensation system through the electrical pins (108); the main cavity (1091) is filled with a sealant, so that the The main cavity (1091) is sealed and isolated from the gas outside the main cavity (1091).
The dew point sensor according to claim 1, characterized in that, the auxiliary cavity (1091) is filled with a sealant, so that the electrical pin (108) and the heat dissipation seat (109) are insulated and connected.
The dew point sensor according to claim 1, characterized in that a part of the structure of the electrical needle (108) is exposed on the upper surface of the heat sink (109).
The dew point sensor according to claim 1, characterized in that the heat dissipation base is provided with a cavity (1093) below the main cavity (1091); the heat dissipation system further comprises a heat dissipation tail cover (112) ); the cavity (1093) is matched with the heat dissipation tail cover (112); the control adapter plate (110) is mounted on the heat dissipation tail cover (112);

Wherein, after the heat dissipation tail cover (112) and the cavity (1093) are installed, the control adapter board (110) is located in the main cavity (1091).
The dew point sensor according to claim 1, characterized in that, a connection structure (1094) is formed on the outer side of the heat dissipation seat (109) to be matched with the detection port of the external detection pipe.
The dew point sensor according to claim 1, characterized in that the dew condensation system is arranged on the upper surface of the heat dissipation seat (109), and the photoelectric detection system comprises a photoelectric detection device (101) and a detection cover (102);

In the detection cover (102), after the lower surface of the detection cover (102) is recessed upward to remove part of the structure, a detection cavity is formed between the side wall and the top of the detection cover (102);

the photoelectric detection device (101), which is mounted on the top of the detection cover (102);

Wherein, after the detection cover (102) is installed on the heat sink (109), the dew condensation system is located in the detection cavity.
The dew point sensor according to claim 6, characterized in that the dew condensation system has a mirror surface (103); a side wall of the detection cover (102) is provided with an air hole (1021), communicated with the detection cavity;

After the detection cover (102) is installed, the lower end of the air hole (1021) is substantially flush with the upper surface of the mirror surface (103).
A dew point sensor according to claim 1, wherein the dew condensation system comprises:

a cooling sheet (107), the upper surface of which is a cooling surface, and the lower surface is a heat dissipation surface, and the heat dissipation surface is connected to the upper surface of the heat dissipation seat (109);

a heat-conducting structure (105), the lower surface of which is connected to the cooling surface, so as to transfer the cooling energy of the cooling surface to the upper surface of the heat-conducting structure (105);

The mirror surface (103), the lower surface of which is connected with the upper surface of the thermally conductive structure (105), so as to transfer the cooling energy from the upper surface of the thermally conductive structure (105) to the upper surface of the mirror surface (103), so that the working environment is The water vapor condenses on the upper surface of the mirror surface (103) to form condensate;

A thermometer (106), embedded in the thermally conductive structure (105).
The dew point sensor according to claim 8, characterized in that the dew condensation system further comprises a sealing ring (104), the sealing ring (104) has an accommodating cavity communicating with the upper and lower surfaces, and the accommodating cavity has a built-in The mirror surface (103), the thermally conductive structure (105), the thermometer (106), and the sealing ring (104) is wrapped around the periphery of the mirror surface (103).
The dew point sensor according to claim 8 or 9, wherein the mirror surface (103) is a silicon wafer; and or, the mirror surface (103) is a silicon wafer, and the outer surface of the mirror surface (103) is a silicon wafer. A platinum layer or a gold layer or a rhodium layer is provided; and/or the mirror surface is a silicon wafer, and its outer surface is provided with a platinum layer, a gold layer or a rhodium layer, and the upper surface of the platinum layer, the gold layer or the rhodium layer is provided with a Coated with hydrophobic material.