A security camera with a photosensitive shooting function

Abstract

The application discloses a security camera with a photosensitive shooting function, and belongs to the technical field of security camera dehumidification, which comprises a camera shell, and further comprises a dehumidification air duct fixed to one side of the camera shell; a plurality of galvanic couples are arranged in the dehumidification air duct; the galvanic couples comprise P-type semiconductors and N-type semiconductors fixed in the dehumidification air duct; the cold end of the P-type semiconductor and the hot end of the N-type semiconductor are connected through wires; and the hot end of the P-type semiconductor and the cold end of the N-type semiconductor are connected through wires. The dehumidification air duct comprises an air inlet pipe, an elbow pipe and an air outlet pipe connected in sequence; the air inlet pipe and the air outlet pipe are fixed to the side wall of the camera shell respectively, the P-type semiconductors and the N-type semiconductors are arranged through the top wall of the air inlet pipe and the bottom wall of the air outlet pipe, the cold end of the P-type semiconductor and the cold end of the N-type semiconductor are located in the air inlet pipe, and the hot end of the P-type semiconductor and the hot end of the N-type semiconductor are located in the air outlet pipe. The application has the effect of improving the heat dissipation efficiency of the light splitter.

Description

Technical Field

[0001] This application relates to the technical field of dehumidification for security cameras, and in particular to a security camera with a photosensitive shooting function. Background Technology

[0002] Light-sensitive shooting refers to capturing clear images under low-light conditions by utilizing the light-sensing element of a camera. Security cameras automatically activate light-sensitive mode in low-light or no-light environments. They are also equipped with infrared lights or other supplementary lighting devices to provide an infrared light source for the camera.

[0003] Security cameras with light-sensing capabilities are often used to shoot in low light or no light conditions. When the relative humidity inside the security camera is high, water droplets will appear on the lens, causing the monitoring image to be blurry or have light spots. However, due to the dim light, staff cannot quickly check whether there are water droplets on the lens through the monitoring image. Therefore, a dehumidification structure needs to be added to the security camera to keep the lens dry for a long time.

[0004] Relative humidity refers to the ratio of the partial pressure of water vapor in the air to the saturated vapor pressure. At a given temperature, the higher the partial pressure of water vapor, the higher the relative humidity. When the partial pressure of water vapor exceeds the saturated vapor pressure, it will condense and form water droplets on the lens. Changes in external temperature affect both the partial pressure of water vapor and the saturated vapor pressure. Generally, increasing temperature decreases relative humidity, while decreasing temperature increases it.

[0005] Common dehumidification methods in existing technologies include desiccant methods and condensation dehumidification methods. Desiccant methods involve placing desiccants inside security cameras to reduce relative humidity; however, desiccants need frequent replacement, and regenerable desiccants require external means such as heating for regeneration. Condensation dehumidification methods require condensers and compressors, making them unsuitable for use in security cameras. Summary of the Invention

[0006] To address the issue of poor dehumidification within security cameras, this application provides a security camera with a light-sensitive shooting function.

[0007] The security camera with photosensitive shooting function provided in this application adopts the following technical solution:

[0008] A security camera with photosensitive shooting function includes a camera housing and a dehumidifying duct fixed to one side of the camera housing. Multiple sets of thermocouples are disposed within the dehumidifying duct. Each thermocouple includes a P-type semiconductor and an N-type semiconductor fixed within the dehumidifying duct. The cold end of the P-type semiconductor and the hot end of the N-type semiconductor are connected by a wire. The hot end of the P-type semiconductor and the cold end of the N-type semiconductor are also connected by a wire. Multiple sets of thermocouples are arranged in parallel, and a power supply is provided in the parallel circuit.

[0009] Optionally, the dehumidification duct includes an air inlet pipe, a bend pipe, and an air outlet pipe connected in sequence; the air inlet pipe and the air outlet pipe are respectively fixed to the side wall of the camera housing; the P-type semiconductor and the N-type semiconductor are disposed through the top wall of the air inlet pipe and the bottom wall of the air outlet pipe; the cold end of the P-type semiconductor and the cold end of the N-type semiconductor are located inside the air inlet pipe; and the hot end of the P-type semiconductor and the hot end of the N-type semiconductor are located inside the air outlet pipe.

[0010] Optionally, two heat exchange plates are fixedly connected inside the air inlet pipe; the cold end of the P-type semiconductor and the cold end of the N-type semiconductor are located between the two heat exchange plates; air inlet holes and air outlet holes are respectively opened on the two heat exchange plates; and a water outlet pipe is fixedly connected to the bottom of the air inlet pipe.

[0011] Optionally, the top wall of the air outlet duct has a heat exchange port, and a telescopic tube is fixedly connected along the heat exchange port; the hot end of the N-type semiconductor and the hot end of the P-type semiconductor are both located inside the telescopic tube, and the telescopic tube includes a top ring fixedly connected to the top wall of the air outlet duct and a bottom ring slidably disposed at the bottom of the top ring; the bottom ring includes two heat insulation rings nested together, and magnetic rings are fixedly connected to the bottom ends of the two heat insulation rings; an electromagnetic ring that can attract the magnetic ring is embedded and fixedly disposed on the bottom wall of the air outlet duct; a tension spring is fixedly connected to the bottom end of the top ring; the bottom end of the tension spring is fixedly connected to the top end of the electromagnetic ring, and the tension spring is used to drive the bottom ring to return to its original position.

[0012] Optionally, a control switch is also provided on the parallel circuit of the electrocouple pair; the control switch is located inside the power supply box; the control switch includes a moving plate end electrically connected to the power supply and a fixed plate end connected to the parallel circuit; the electromagnet and the fixed plate end are both fixed to one side of the moving plate end, and the moving plate end is slidably disposed inside the power supply box; a magnetic attracting plate that can magnetically attract the electromagnet is fixed to one end of the moving plate end.

[0013] Optionally, a dovetail piece is fixedly connected to the bottom of the moving plate end, and a dovetail groove is provided on the bottom wall of the power supply box to accommodate the dovetail piece; a compression spring is fixedly connected in the dovetail groove, and the end of the compression spring is fixedly connected to the dovetail piece to push the moving plate end to reset in a direction away from the fixed plate end.

[0014] Optionally, a temperature and humidity circuit is provided inside the camera housing, the temperature and humidity circuit including a thermistor, a humidity sensor and a relay connected in series; the electromagnet is connected to the normally closed contact of the relay.

[0015] Optionally, a second relay is connected in parallel with the thermistor, and the normally open contact of the second relay is electrically connected to the electromagnetic ring.

[0016] In summary, this application includes at least one of the following beneficial technical effects:

[0017] 1. This application introduces airflow into a dehumidification duct and uses a thermocouple to lower the air temperature, thereby condensing water vapor in the air into liquid water and reducing the relative humidity of the air; by repeatedly performing the above operation, dehumidification of the camera housing can be achieved.

[0018] 2. Since the device inside the camera housing releases a lot of heat when it is working, the relative humidity will increase during the internal cooling process when the outside temperature drops. In this application, after drying the gas, the gas is heat-exchanged with the hot end of the N-type semiconductor. On the one hand, the temperature of the exhaust gas can be increased to slow down the cooling rate of the temperature inside the camera housing. On the other hand, the relative humidity of the exhaust gas can be increased by heating.

[0019] 3. This application also includes a temperature and humidity circuit for controlling the switch of the thermocouple pair. When the relative humidity increases, the control switch of the thermocouple pair will be turned on automatically, reducing the need for manual monitoring of humidity. Attached Figure Description

[0020] Figure 1 This is a structural schematic diagram of a security camera according to an embodiment of this application.

[0021] Figure 2 This is a cross-sectional view of the dehumidification duct in an embodiment of this application.

[0022] Figure 3 This is a schematic diagram of the structure of the telescopic tube in an embodiment of this application.

[0023] Figure 4 This is a cross-sectional view of the power supply box according to an embodiment of this application.

[0024] Reference numerals: 1. Camera housing; 2. Dehumidification duct; 21. Air inlet pipe; 22. Bend; 23. Wedge-shaped platform; 24. Heat exchange plate; 25. Air inlet; 26. Air outlet; 27. Spiral air duct; 28. Water outlet pipe; 29. ​​Water outlet; 3. Electrode pair; 31. P-type semiconductor; 32. N-type semiconductor; 4. Air outlet pipe; 41. Heat exchange port; 42. Telescopic pipe; 43. Top ring; 44. Bottom ring; 45. Heat insulation ring; 46. Magnetic ring; 47. Electromagnetic ring; 48. Tension spring; 5. Control switch; 51. Electromagnet; 52. Power supply box; 53. Moving plate end; 54. Fixed plate end; 55. Magnetic plate; 56. Dovetail plate; 57. Dovetail groove; 58. Compression spring. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0026] This application discloses a security camera with a photosensitive shooting function. (Refer to...) Figure 1 The security camera with light-sensing shooting function includes a camera housing 1 and a dehumidifying air duct 2 fixed to one side of the camera housing 1.

[0027] Reference Figure 1 and Figure 2 The dehumidification duct 2 includes an air inlet pipe 21, a bend pipe 22, and an air outlet pipe 4 connected in sequence. The air inlet pipe 21 is located below the air outlet pipe 4. The air inlet pipe 21 and the air outlet pipe 4 are respectively fixed to the side wall of the camera housing 1, and the side wall of the camera housing 1 has an air inlet communicating with the air inlet pipe 21 and an air outlet communicating with the air outlet pipe 4. The wall of the dehumidification duct 2 is made of heat-insulating material to reduce heat exchange between the airflow and the external environment. An air pump is installed in the air inlet to introduce the airflow from the camera housing 1 into the air inlet pipe 21. After dehumidification, the airflow returns to the camera housing 1 through the air outlet pipe 4. A filter screen is installed in the air inlet to block dust and impurities from entering the air inlet pipe 21.

[0028] Reference Figure 2Multiple sets of thermocouples 3 are installed inside the dehumidification duct 2. Each thermocouple 3 includes a P-type semiconductor 31 and an N-type semiconductor 32 fixed within the inlet duct 21 and the outlet duct 4. The P-type semiconductor 31 and the N-type semiconductor 32 penetrate the top wall of the inlet duct 21 and the bottom wall of the outlet duct 4, with the cold ends of the P-type semiconductor 31 and the N-type semiconductor 32 located inside the inlet duct 21, and the hot ends of the P-type semiconductor 31 and the N-type semiconductor 32 located inside the outlet duct 4. The cold ends of the P-type semiconductor 31 and the hot ends of the N-type semiconductor 32 are connected by wires; similarly, the hot ends of the P-type semiconductor 31 and the cold ends of the N-type semiconductor 32 are also connected by wires. Multiple sets of thermocouples 3 are connected in parallel, and a power supply and a control switch 5 are installed in the parallel circuit. When the control switch 5 is closed, the power supply applies voltage to the thermocouples 3, causing the cold end of the P-type semiconductor 31 to absorb heat and the hot end of the N-type semiconductor 32 to release heat.

[0029] Reference Figure 2 Two heat exchange plates 24 are fixedly connected inside the air inlet duct 21. The heat exchange plates 24 have a square longitudinal section, and their four peripheral sidewalls are fixedly connected to the inner wall of the air inlet duct 21. The cold ends of the P-type semiconductor 31 and the N-type semiconductor 32 are located between the two heat exchange plates 24. An air inlet hole 25 is provided on the heat exchange plate 24 near the air inlet, and an air outlet hole 26 is provided on the heat exchange plate 24 away from the air inlet. The air inlet hole 25 and the air outlet hole 26 are staggered so that after the airflow enters the area between the two heat exchange plates 24, it makes full contact with the thermocouple pair 3 and leaves through the air outlet hole 26. Both heat exchange plates 24 are made of heat insulation material, so that the P-type semiconductor 31 in the heat absorption state creates a low-temperature space in the area between the two heat insulation plates.

[0030] Reference Figure 2 A spiral air passage 27 can be provided between the two heat exchange plates 24, and the spiral air passage 27 is arranged around the thermocouple pair 3 to prolong the contact time between the airflow and the thermocouple pair 3.

[0031] Reference Figure 2 A water outlet pipe 28 is fixedly connected to the bottom wall of the air inlet pipe 21, and a water outlet hole 29 communicating with the water outlet pipe 28 is opened in the area between the two heat exchange plates 24 on the bottom wall of the air inlet pipe 21. Wedge-shaped platforms 23 are fixedly connected to the bottom of the opposite sides of the two heat exchange plates 24. After the airflow enters the low-temperature area between the two heat exchange plates 24, the water vapor in the airflow condenses into liquid water and adheres to the heat exchange plates 24 or the periphery of the P-type semiconductor 31. Finally, the liquid water flows into the water outlet pipe 28 and is discharged due to gravity. The cold end of the P-type semiconductor 31 and the cold end of the N-type semiconductor 32 are covered with a waterproof membrane to reduce the impact of liquid water on the conductivity of the thermocouple pair 3; the waterproof membrane can be made of ultra-high molecular weight polyethylene film.

[0032] Reference Figure 2 and Figure 3The top wall of the air outlet duct 4 has a heat exchange port 41, and a telescopic tube 42 is fixedly connected to the heat exchange port 41. The hot ends of the N-type semiconductor 32 and the P-type semiconductor 31 are both located inside the telescopic tube 42, and the tops of the N-type semiconductor 32 and the P-type semiconductor 31 extend out of the heat exchange port 41 to release heat to the outside of the air outlet duct 4. An exhaust fan can be installed in the heat exchange port 41 to accelerate the airflow and speed up heat exchange. The telescopic tube 42 is made of heat-insulating material to reduce heat exchange between the thermocouple pair 3 and the airflow inside the air outlet duct 4. The telescopic tube 42 includes a top ring 43 fixedly connected to the inner top wall of the air outlet duct 4 and a bottom ring 44 slidably disposed at the bottom of the top ring 43. The bottom ring 44 includes two concentrically arranged heat-insulating rings 45, which are respectively attached to the outer peripheral wall and the inner peripheral wall of the bottom ring 44. Two heat-insulating rings 45 are fixedly connected to their bottom ends with magnetic rings 46. The diameters of the heat-insulating rings 45 and the magnetic rings 46, which are in contact with the outer wall of the top ring 43, are similar to reduce heat exchange inside and outside the telescopic tube 42. An electromagnetic ring 47, which can attract the magnetic rings 46, is embedded and fixed in the bottom wall of the air outlet duct 4. The electromagnetic ring 47 is concentrically arranged with the bottom ring 44. When the electromagnetic ring 47 is energized, the bottom ring 44 moves downward due to magnetic attraction and connects with the electromagnetic ring 47, thereby forming an annular area within the air outlet duct 4 that reduces heat exchange in the telescopic tube 42. At this time, the heat released from the hot end of the N-type semiconductor 32 is discharged through the heat exchange port 41. A tension spring 48 is provided in the annular area between the two heat-insulating rings 45. The top end of the tension spring 48 is fixedly connected to the bottom end face of the top ring 43, and the bottom end is fixedly connected to the top end face of the electromagnetic ring 47, which is used to drive the bottom ring 44 to return upward. After the electromagnetic ring 47 is de-energized, the bottom ring 44 moves upward; some of the heat released by the hot end of the N-type semiconductor 32 flows into the air outlet 4 through the gap between the bottom ring 44 and the bottom wall of the air outlet 4; the airflow after condensation and drying increases in temperature after passing through the air outlet 4, further reducing the relative humidity of the airflow.

[0033] A temperature and humidity circuit is installed inside the camera housing 1. An electromagnet 51 is connected in series within the temperature and humidity circuit. The circuit detects the temperature and humidity inside the camera housing 1 and provides feedback on these parameters by switching the electromagnet 51 on and off. The temperature and humidity circuit includes a thermistor and a humidity sensor connected in series and is externally powered. The thermistor has a negative temperature coefficient, while the humidity sensor has a positive temperature coefficient. The thermistor's resistance decreases as temperature increases, while the humidity sensor's resistance increases as temperature increases and as the partial pressure of water vapor increases. Appropriate temperature coefficients are selected for the thermistor and humidity sensor so that the sum of their resistances increases synchronously with the increase in relative humidity.

[0034] Simultaneously, a relay 1 is connected in series in the temperature and humidity circuit, and electromagnet 51 is connected to the normally closed contact of relay 1. When the relative humidity rises to the preset humidity threshold, the sum of the resistances of the thermistor and the humidity sensor increases synchronously, causing the coil current of relay 1 to fall below the preset pull-in current, thereby energizing electromagnet 51 and opening it. When the relative humidity drops below the humidity threshold, the coil current of relay 1 becomes higher than the pull-in current, and electromagnet 51 is de-energized and closed.

[0035] Reference Figure 4 The security camera also includes a power supply box 52 for housing the electromagnet 51 and the control switch 5. The power supply box 52 can be installed on the outer wall of the camera housing 1 or the outer wall of the air duct 4. The control switch 5 includes a moving end 53 connected to the power supply and a fixed end 54 connected to the parallel circuit of the thermocouple pair 3. The electromagnet 51 and the fixed end 54 are fixed inside the power supply box 52, and the moving end 53 is slidably disposed inside the power supply box 52. The electromagnet 51 and the fixed end 54 are disposed on one side of the moving end 53. In this embodiment, the fixed end 54 is disposed along the length direction of the electromagnet 51. A magnetic suction piece 55 is fixed to the end of the moving end 53, which can magnetically attract the electromagnet 51. After the electromagnet 51 is energized, the moving end 53 and the fixed end 54 are electrically contacted by attracting the magnetic suction piece 55, so that the parallel circuit of the thermocouple pair 3 is connected to the power supply. A dovetail plate 56 is fixedly connected to the bottom of the moving plate end 53, and a dovetail groove 57 is opened on the bottom wall of the power supply box 52 to accommodate the dovetail plate 56; a compression spring 58 is fixedly connected in the dovetail groove 57, and the end of the compression spring 58 is fixedly connected to the dovetail plate 56 to push the moving plate end 53 to reset in a direction away from the fixed plate end 54.

[0036] A second relay and an electromagnetic ring 47 are connected in parallel to the thermistor. The electromagnetic ring 47 is connected to the normally open contact of the second relay. When the temperature rises, the resistance of the thermistor decreases. When the coil current of the second relay exceeds the preset pull-in current, the electromagnetic ring 47 opens and drives the bottom ring 44 to move downward and connect with the inner bottom wall of the air outlet duct 4. At this time, the heat released by the N-type semiconductor 32 flows out through the heat exchange port 41, and the dry airflow enters the camera housing 1 at a low temperature to cool the inside of the camera housing 1. When the temperature drops, the resistance of the thermistor increases. When the coil current of the second relay is lower than the pull-in current, the electromagnetic ring 47 closes, the bottom ring 44 moves upward and separates from the electromagnetic ring 47, and the dry airflow exchanges heat with the hot end of the N-type semiconductor 32 before entering the camera housing 1 to further reduce the relative humidity inside the dry airflow.

[0037] The specific implementation principle of a security camera with photosensitive shooting function in this embodiment is as follows:

[0038] In this embodiment, the absolute value of the thermistor's resistance is greater than the absolute value of the humidity sensor's resistance. During the cooling process, the relative humidity increases, and the sum of the thermistor and humidity sensor's resistances increases. When the total resistance rises to the point where the current in the series circuit is lower than the preset current of relay one, electromagnet 51 conducts and energizes thermocouple 3. Starting the air pump introduces air from inside the camera housing 1 into the dehumidification duct 2 for condensation and dehumidification. At this time, the thermistor's resistance rises, the current through relay two is lower than its preset current, electromagnetic ring 47 is de-energized and closed, bottom ring 44 moves upward and separates from electromagnetic ring 47, and the dry airflow exchanges heat with the hot end of N-type semiconductor 32 before entering the camera housing 1.

[0039] During the heating process, the relative humidity decreases, and the sum of the resistances of the thermistor and the humidity sensor decreases. The current through the series circuit exceeds the preset current of relay one, causing electromagnet 51 to de-energize. When the partial pressure of water vapor in the air increases, such as during rainy weather, the sum of the resistances of the thermistor and the humidity sensor increases, causing electromagnet 51 to energize. Air from inside the camera housing 1 is then introduced into the dehumidification duct 2 for condensation and dehumidification. At this time, the thermistor resistance decreases, and the current through relay two exceeds its preset current. Electromagnetic ring 47 is energized and opens, allowing dry airflow, maintained at a low temperature, to enter the camera housing 1 for cooling.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A security camera with photosensitive shooting function, comprising a camera housing (1), characterized in that: It also includes a dehumidifying air duct (2) fixed to one side of the camera housing (1); multiple sets of thermocouples (3) are provided in the dehumidifying air duct (2), and each thermocouple (3) includes a P-type semiconductor (31) and an N-type semiconductor (32) fixed in the dehumidifying air duct (2); the cold end of the P-type semiconductor (31) and the hot end of the N-type semiconductor (32) are connected by a wire; the hot end of the P-type semiconductor (31) and the cold end of the N-type semiconductor (32) are connected by a wire; multiple sets of thermocouples (3) are arranged in parallel, and a power supply is provided on the parallel circuit; The dehumidification duct (2) includes an air inlet pipe (21), a bend pipe (22), and an air outlet pipe (4) connected in sequence; the air inlet pipe (21) and the air outlet pipe (4) are respectively fixed to the side wall of the camera housing (1); the P-type semiconductor (31) and the N-type semiconductor (32) are disposed through the top wall of the air inlet pipe (21) and the bottom wall of the air outlet pipe (4); the cold end of the P-type semiconductor (31) and the cold end of the N-type semiconductor (32) are located in the air inlet pipe (21); the hot end of the P-type semiconductor (31) and the hot end of the N-type semiconductor (32) are located in the air outlet pipe (4). Two heat exchange plates (24) are fixedly connected inside the air inlet pipe (21); the cold end of the P-type semiconductor (31) and the cold end of the N-type semiconductor (32) are located between the two heat exchange plates (24); air inlet holes (25) and air outlet holes (26) are respectively opened on the two heat exchange plates (24); a water outlet pipe (28) is fixedly connected to the bottom of the air inlet pipe (21). The top wall of the air outlet pipe (4) is provided with a heat exchange port (41), and a telescopic pipe (42) is fixedly connected along the heat exchange port (41); the hot end of the N-type semiconductor (32) and the hot end of the P-type semiconductor (31) are both located inside the telescopic pipe (42). The telescopic pipe (42) includes a top ring (43) fixedly connected to the top wall of the air outlet pipe (4) and a bottom ring (44) slidably located at the bottom of the top ring (43); the bottom ring (44) includes two heat insulation rings (45) nested together, and a magnetic ring (46) is fixedly connected to the bottom end of the two heat insulation rings (45); an electromagnetic ring (47) that can attract the magnetic ring (46) is embedded and fixedly installed on the bottom wall of the air outlet pipe (4); a tension spring (48) is fixedly connected to the bottom end of the top ring (43); the bottom end of the tension spring (48) is fixedly connected to the top end of the electromagnetic ring (47), and the tension spring (48) is used to drive the bottom ring (44) to return to its original position.

2. A security camera with photosensitive shooting function according to claim 1, characterized in that: A control switch (5) is also provided on the parallel circuit of the electric couple (3); the control switch (5) is located in the power supply box (52); the control switch (5) includes a moving plate end (53) electrically connected to the power supply and a fixed plate end (54) connected to the parallel circuit; an electromagnet (51) is also fixed in the power supply box (52); the electromagnet (51) and the fixed plate end (54) are both fixed on one side of the moving plate end (53), and the moving plate end (53) is slidably disposed in the power supply box (52); a magnetic attracting plate (55) that can magnetically attract the electromagnet (51) is fixed at one end of the moving plate end (53).

3. A security camera with photosensitive shooting function according to claim 2, characterized in that: A dovetail piece (56) is fixedly connected to the bottom of the moving plate end (53), and a dovetail groove (57) is provided on the bottom wall of the power box (52) to accommodate the dovetail piece (56); a compression spring (58) is fixedly connected in the dovetail groove (57), and the end of the compression spring (58) is fixedly connected to the dovetail piece (56) to push the moving plate end (53) to reset in a direction away from the fixed plate end (54).

4. A security camera with photosensitive shooting function according to claim 2, characterized in that: The camera housing (1) is provided with a temperature and humidity circuit, which includes a thermistor, a humidity-sensitive resistor and a relay connected in series; the electromagnet (51) is connected to the normally closed contact of the relay.

5. A security camera with photosensitive shooting function according to claim 4, characterized in that: A second relay is connected in parallel to the thermistor, and the normally open contact of the second relay is electrically connected to the electromagnetic ring (47).

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