Photoelectric smoke detector and photoelectric smoke detector self-maintenance system

Abstract

A photoelectric smoke detector and a photoelectric smoke detector self-maintenance system, which relate to the technical field of fire detectors, are used to solve the problem of low efficiency when detecting whether the photoelectric smoke detector can work normally. The light-emitting component is arranged in the optical detection cavity; the photosensitive device is arranged in the optical detection cavity; the photosensitive device is electrically connected to the alarm device, and the photosensitive devices are all located on the light-emitting path of the first light, and at most part of the photosensitive device is located on the light-emitting path of the second light; when the first light source is turned on and the second light source is turned off, the alarm device is turned on, and when the first light source is turned off and the second light source is turned on, the alarm device is turned off. This application is used to detect whether a fire has occurred.

Description

Technical Field

[0001] The present application relates to the technical field of fire detectors, and in particular to a photoelectric smoke detector and a photoelectric smoke detector self-maintenance system. Background Art

[0002] Photoelectric smoke detectors are devices that detect fires by using the absorption and scattering of light by fire smoke. Due to various reasons such as equipment aging, some photoelectric smoke detectors may malfunction. If they are not discovered in time, a tragedy may occur when a fire breaks out.

[0003] In the related art, in order to test the photoelectric smoke detector and determine whether it can work normally, that is, whether it can alarm when a fire occurs, the operator usually uses a smoke gun to blow white gas into the photoelectric smoke detector to simulate the fire scene, and determines whether the photoelectric smoke detector is faulty by testing whether the photoelectric smoke detector can alarm.

[0004] However, since there are many photoelectric smoke detectors on a building, operators need to use a smoke gun to spray white gas into each photoelectric smoke detector and detect them one by one, which makes the detection efficiency extremely low. Summary of the invention

[0005] The present application provides a photoelectric smoke detector and a photoelectric smoke detector self-maintenance system, which are used to solve the problem of low efficiency when detecting whether the photoelectric smoke detector can work normally.

[0006] In a first aspect, the present application provides a photoelectric smoke detector for electrically connecting to an alarm device. The photoelectric smoke detector includes a housing, a light-emitting component, and a photosensitive device. An optical detection cavity is provided inside the shell; a light-emitting component is arranged in the optical detection cavity, and the light-emitting component includes a first light source and a second light source, the first light source is used to emit a first light, and the second light source is used to emit a second light; a photosensitive device is arranged in the optical detection cavity, and the photosensitive device is electrically connected to the alarm device; the photosensitive devices are all located on the light exit path of the first light, and at most a part of the photosensitive devices is located on the light exit path of the second light; when the first light source is turned on and the second light source is turned off, the photosensitive device generates a first electrical signal according to the first light, and transmits the first electrical signal to the alarm device; when the first light source is turned off and the second light source is turned on, the photosensitive device generates a second electrical signal according to the second light, and transmits the second electrical signal to the alarm device; when the first light source is turned on and the second light source is turned off, the alarm device is turned on, and when the first light source is turned off and the second light source is turned on, the alarm device is turned off; or, when the first light source is turned on and the second light source is turned off, the alarm device is turned off, and when the first light source is turned off and the second light source is turned on, the alarm device is turned on.

[0007] In the photoelectric smoke detector of the present application, all the photosensitive components are located on the light-emitting path of the first light, and at most part of them are located on the light-emitting path of the second light.

[0008] Therefore, the photosensitive device can sense two different intensities of light and generate two different signals (a first electrical signal and a second electrical signal), and then transmit the first electrical signal to the alarm device and the second electrical signal to the alarm device.

[0009] If the alarm device does not sound an alarm after receiving the first electrical signal, but can sound an alarm after receiving a second electrical signal different from the first electrical signal, it means that the photoelectric smoke detector is normal. On the contrary, if it does not sound an alarm after receiving the second electrical signal, it means that the photoelectric smoke detector is damaged. This is the alarm process of simulating a dimming photoelectric smoke detector. Or,

[0010] If the alarm device does not alarm after receiving the second electrical signal, but can alarm after receiving the first electrical signal different from the second electrical signal, it means that the photoelectric smoke detector is normal. Otherwise, if it does not alarm, it means that the photoelectric smoke detector is damaged. This is the alarm process of simulating the scattered light photoelectric smoke detector.

[0011] The light-emitting component emits the first light and the second light to simulate the light of different intensities sensed by the photosensitive device at the fire scene, so that the photosensitive device can emit different electrical signals to the alarm device, so that the alarm device can switch between the closed state and the open state when receiving different electrical signals, thereby judging whether the photoelectric smoke detector is normal.

[0012] By using the combination of light-emitting components and photosensitive devices, the photoelectric smoke detector can be tested to determine whether it is faulty. It is convenient and quick to use a smoke gun to simulate a fire scene without having to use a smoke gun on site.

[0013] Optionally, the color of the first light is different from the color of the second light;

[0014] The photoelectric smoke detector also includes a refractive lens, which is arranged in the optical detection cavity and on the light-emitting side of the light-emitting element, and is used to refract the first light and the second light, and the light-emitting path of the part of the first light located on the light-entering side of the refractive lens is parallel to the light-emitting path of the part of the second light located on the light-entering side of the refractive lens; the photosensitive device is entirely located on the light-emitting path of the first light refracted by the refractive lens, and at most partially located on the light-emitting path of the second light refracted by the refractive lens.

[0015] Optionally, the refractive lens comprises a silicon optical antenna for directionally refracting the first light and the second light.

[0016] Optionally, a light-exiting path of a portion of the first light rays located on the light-incident side of the refractive lens coincides with a light-exiting path of a portion of the second light rays located on the light-incident side of the refractive lens.

[0017] Optionally, all photosensitive devices are not located on the light exit path of the second light refracted by the refracting lens; the photoelectric smoke detector also includes a reflective element, which is arranged in the optical detection cavity, and the reflective element is at least partially located on the light exit path of the second light refracted by the refracting lens, and is used to reflect part of the second light refracted by the refracting lens to the photosensitive device.

[0018] Optionally, the reflector includes a baffle, and the baffle and the shell are an integrally formed structure.

[0019] Optionally, the first light is red light, and the second light is blue light.

[0020] In a second aspect, the present application provides a photoelectric smoke detector self-maintenance system, comprising at least one photoelectric smoke detector, a controller and an alarm device, wherein the photoelectric smoke detector is any one of the above-mentioned photoelectric smoke detectors; the controller is electrically connected to the photosensitive device of the photoelectric smoke detector; and the alarm device is electrically connected to the controller.

[0021] In the photoelectric smoke detector self-maintenance system of the present application, since the photosensitive device of the photoelectric smoke detector is electrically connected to the controller, and the alarm device is electrically connected to the controller, the photoelectric smoke detector can transmit the detected signal to the controller, and the controller can control the alarm device to be turned off or on according to different signals, thereby completing the detection of the photoelectric smoke detector.

[0022] Optionally, the photoelectric smoke detector self-maintenance system further includes a timing device, which is electrically connected to the controller;

[0023] The controller is configured to: when the timing device reaches a first preset time point, control the first light source of the light-emitting component of the photoelectric smoke detector to turn on, and the second light source of the light-emitting component of the photoelectric smoke detector to turn off; when the timing device reaches a second preset time point, control the first light source to turn off, and the second light source to turn on;

[0024] Alternatively, when the timing device reaches a first preset time point, the first light source is turned off and the second light source is turned on; when the timing device reaches a second preset time point, the first light source is controlled to be turned on and the second light source is turned off.

[0025] Optionally, the alarm device includes a buzzer and a display device, the buzzer is electrically connected to the controller; the display device is electrically connected to the controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification, but do not constitute a limitation to the technical solution of the present invention.

[0027] Figure 1 A schematic diagram of the external structure of the photoelectric smoke detector self-maintenance system provided in this application;

[0028] Figure 2 Another schematic diagram of the external structure of the photoelectric smoke detector self-maintenance system provided in this application;

[0029] Figure 3 A schematic diagram of another external structure of the photoelectric smoke detector self-maintenance system provided in this application;

[0030] Figure 4 A schematic diagram of the external structure of a photoelectric smoke detector provided in the related art;

[0031] Figure 5 Another schematic diagram of the external structure of a photoelectric smoke detector provided in the related art;

[0032] Figure 6 It is another external structure schematic diagram of a photoelectric smoke detector provided in the related art;

[0033] Figure 7 It is another external structure schematic diagram of a photoelectric smoke detector provided in the related art;

[0034] Figure 8 It is another external structure schematic diagram of a photoelectric smoke detector provided in the related art;

[0035] Fig. 9 A schematic diagram of the external structure of a photoelectric smoke detector provided in this application;

[0036] Fig.10 Another schematic diagram of the external structure of the photoelectric smoke detector provided in this application;

[0037] Fig.11 Another schematic diagram of the external structure of the photoelectric smoke detector provided in this application;

[0038] Fig.12 Another schematic diagram of the external structure of the photoelectric smoke detector provided in this application.

[0039] Figure numerals: 10 - self-maintenance system of photoelectric smoke detector; 100 - photoelectric smoke detector; 10a - shell; 10b - light-emitting element; 10c - photosensitive element; 110 - shell; 120 - light-emitting assembly; 121 - first light source; 122 - second light source; 130 - photosensitive device; 140 - refracting lens; 150 - reflector. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0042] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0043] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. In addition, when describing a pipeline, the "connected" and "connection" used in this application have the meaning of conduction. The specific meaning needs to be understood in conjunction with the context.

[0044] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0045] Photoelectric smoke detector systems are widely used in daily life as devices that detect smoke and issue alarms when a fire occurs.

[0046] Based on this, Figure 1As shown, the present application provides a photoelectric smoke detector self-maintenance system 10, including at least one photoelectric smoke detector 100, an alarm device and a controller, the photoelectric smoke detector 100 is electrically connected to the controller, and the alarm device is electrically connected to the controller.

[0047] When a fire occurs, the smoke concentration in the air will increase, and the particles in the smoke will enter the photoelectric smoke detector 100. At this time, the photoelectric smoke detector 100 can send an alarm signal to the controller based on the smoke, and the controller will control the alarm device to alarm based on the electrical signal.

[0048] Among them, Figure 2 As shown, multiple photoelectric smoke detectors 100 can be provided, and the multiple photoelectric smoke detectors 100 are electrically connected to the controller, that is, an alarm device is electrically connected to the photoelectric smoke detector 100 to detect the indoor smoke concentration and alarm. Of course, one photoelectric smoke detector 100 can also be provided.

[0049] In addition, the photoelectric smoke detector 100 is generally installed on the roof. When a fire occurs, the hot smoke in the room will float upward. Therefore, installing the photoelectric smoke detector 100 on the roof can quickly detect the smoke in the room, thereby quickly responding to the alarm.

[0050] For example, Figure 3 As shown, the alarm device generally includes a buzzer and a display device. The buzzer is electrically connected to the controller, and the display device is also electrically connected to the controller.

[0051] When the controller receives the alarm signal, it will control the buzzer to sound and give a sound alarm prompt. At the same time, the photoelectric smoke detector 100 that issued the alarm signal will also show a prompt at the corresponding position on the display device, such as a flashing light spot. The above two alarm modes of sound and picture will indicate the occurrence of fire.

[0052] In order to detect smoke using the photoelectric smoke detector 100 and use the alarm device to give an alarm prompt, as Figure 4 As shown, in the related art, a photoelectric smoke detector 100 is provided, which includes a housing 10a, a light emitting element 10b and a photosensitive element 10c. A cavity is provided inside the housing 110, and the light emitting element 10b is arranged in the cavity, and the light emitting element 10b can emit infrared light; the photosensitive element 10c is arranged in the cavity and is electrically connected to the controller.

[0053] According to the different positions between the photosensitive element 10c and the light emitting element 10b, the photoelectric smoke detector 100 includes two types: a dimming type and a scattered light type.

[0054] like Figure 5As shown, when the photoelectric smoke detector 100 is of dimming type, the photosensitive element 10c is arranged on the light emitting path of the light emitting element 10b, that is, the photosensitive element 10c and the light emitting element 10b are arranged opposite to each other.

[0055] In this case, if Figure 5 As shown, in the non-alarm mode, the photosensitive element 10c can receive light with a relatively high intensity. At this time, if a fire occurs, smoke will enter the cavity. Since the smoke contains particles, Figure 6 As shown, a portion of the light irradiated to the photosensitive element 10c will come into contact with the particles and scatter, causing the light to irradiate other positions. In this way, the light received by the photosensitive element 10c will be reduced and the light intensity will also be weakened. At this time, the photosensitive element 10c will emit an alarm signal, and the controller will control the alarm device to issue an alarm prompt after receiving the alarm signal.

[0056] like Figure 7 As shown, when the photoelectric smoke detector 100 is of scattered light type, the photosensitive element 10c and the light-emitting element 10b are arranged at a certain angle, that is, the photosensitive element 10c is partially arranged on the light emitting path of the light-emitting element 10b, or is not located on the light sensing path of the light-emitting element 10b.

[0057] In this case, if Figure 7 As shown, in the non-alarm mode, the photosensitive element 10c can receive light of lower intensity, or cannot receive light. At this time, if a fire occurs, smoke will enter the cavity. Since the smoke contains particles, Figure 8 As shown, a portion of the light that does not irradiate the photosensitive element 10c will come into contact with the particulate matter and be scattered, causing the light to irradiate the photosensitive element 10c. In this way, the light received by the photosensitive element 10c will increase, and the light intensity will also increase. At this time, the photosensitive element 10c will emit an alarm signal, and the controller will control the alarm device to issue an alarm prompt after receiving the alarm signal.

[0058] Through the above detection method, the photoelectric smoke detector 100 is used to detect the smoke concentration and issue an alarm.

[0059] It can be understood that in order to allow the light scattered by the particles to contact the photosensitive element 10c, the angle between the light emitting element 10b and the photosensitive element 10c should be set in advance.

[0060] Due to reasons such as equipment aging, some of the photoelectric smoke detectors 100 may malfunction, which may lead to tragedy when a fire breaks out if it is not discovered in time.

[0061] Therefore, in the related art, in order to detect the photoelectric smoke detector 100 and determine whether it can work normally, that is, whether it can alarm when a fire occurs, the operator usually holds a smoke gun and blows white gas into the photoelectric smoke detector 100 to simulate the fire scene, and determines whether the photoelectric smoke detector 100 can work normally by detecting whether the photoelectric smoke detector can alarm.

[0062] However, since there are many photoelectric smoke detectors 100 on a building, the operator needs to use a smoke gun to spray white gas into each photoelectric smoke detector 100 and detect them one by one, which is time-consuming and extremely inefficient.

[0063] It is also labor-intensive, requiring one person to operate the smoke gun on site and another to confirm the alarm result in the control room.

[0064] Based on this, the present application provides a photoelectric smoke detector 100, which is electrically connected to an alarm device, such as Fig. 9 As shown, it includes a housing 110, a light emitting assembly 120 and a photosensitive device 130. The housing 110 has an optical detection cavity, i.e., an optical maze; the light emitting assembly 120 is disposed in the optical detection cavity, and the light emitting assembly 120 includes a first light source 121 and a second light source 122, the first light source 121 is used to emit a first light, and the second light source 122 is used to emit a second light; the photosensitive device

[0065] 130 is arranged in the optical detection cavity, and the photosensitive device 130 is electrically connected to the alarm device; the photosensitive device 130 is entirely located on the light-emitting path of the first light, and at most a part of the photosensitive device 130 is located on the light-emitting path of the second light;

[0066] When the first light source 121 is turned on and the second light source 122 is turned off, the photosensitive device 130 generates a first electrical signal according to the first light, and transmits the first electrical signal to the alarm device; when the first light source 121 is turned off and the second light source 122 is turned on, the photosensitive device 130 generates a second electrical signal according to the second light, and transmits the second electrical signal to the alarm device;

[0067] When the first light source 121 is turned on and the second light source 122 is turned off, the alarm device is turned on; when the first light source 121 is turned off and the second light source 122 is turned on, the alarm device is turned off; or, when the first light source 121 is turned on and the second light source 122 is turned off, the alarm device is turned off; when the first light source 121 is turned off and the second light source 122 is turned on, the alarm device is turned on.

[0068] The photosensitive device 130 is entirely located on the light-emitting path of the first light, and at most partially located on the light-emitting path of the second light.

[0069] Therefore, the photosensitive device 130 can generate two different signals (a first electrical signal and a second electrical signal) according to two lights of different intensities, and then transmit the first electrical signal to the alarm device and the second electrical signal to the alarm device.

[0070] If the alarm device does not alarm after receiving the first electrical signal, but can alarm after receiving the second electrical signal different from the first electrical signal, it means that the photoelectric smoke detector 100 is normal. On the contrary, if it does not alarm after receiving the second electrical signal, it means that the photoelectric smoke detector 100 is damaged. This is the alarm process of simulating the dimming type photoelectric smoke detector. Or,

[0071] If the alarm device does not alarm after receiving the second electrical signal, but can alarm after receiving the first electrical signal different from the second electrical signal, it means that the photoelectric smoke detector 100 is normal. On the contrary, if it does not alarm after receiving the first electrical signal, it means that the photoelectric smoke detector 100 is damaged. This is the alarm process of simulating the scattered light photoelectric smoke detector.

[0072] The light emitting assembly 120 emits the first light and the second light to simulate the fire scene. The light sensing device 130 receives light of different intensities, so that the light sensing device 130 can transmit different electrical signals to the alarm device, so that the alarm device can switch between the closed state and the open state when receiving different electrical signals, thereby judging whether the photoelectric smoke detector 100 is normal.

[0073] Moreover, when the photoelectric smoke detector 100 in the present application detects whether a fault occurs, only one person is required to operate it in the control room, which can save manpower.

[0074] It is understandable that the alarm device does not sound an alarm after receiving the first electrical signal, but can sound an alarm after receiving the second electrical signal different from the first electrical signal. In this case, the photoelectric smoke detector 100 is a dimming type photoelectric smoke detector 100.

[0075] When the alarm device does not sound an alarm after receiving the second electrical signal, but can sound an alarm after receiving the first electrical signal different from the second electrical signal, in this case, the photoelectric smoke detector 100 is a scattering type photoelectric smoke detector 100 .

[0076] Exemplarily, in order to locate all the photosensitive devices 130 on the light-emitting path of the first light, and at most a portion of the photosensitive devices 130 on the light-emitting path of the second light, as shown in FIG. Fig.10As shown, the color of the first light is different from the color of the second light; the photoelectric smoke detector 100 also includes a refractive lens 140, which is arranged in the optical detection cavity and on the light-emitting side of the light-emitting component 120, and is used to refract the first light and the second light, and the light-emitting path of the part of the first light located on the light-incident side of the refractive lens 140 is parallel to the light-emitting path of the part of the second light located on the light-incident side of the refractive lens 140; the photosensitive device 130 is entirely located on the light-emitting path of the first light refracted by the refractive lens 140, and at most partially located on the light-emitting path of the second light refracted by the refractive lens 140.

[0077] By setting the refractive lens 140, the photosensitive device 130 is completely located on the light-emitting path of the refracted first light, and at most partially located on the light-emitting path of the second light. In this way, the photosensitive device 130 is completely located on the light-emitting path of the first light, and at most partially located on the light-emitting path of the second light.

[0078] Since light of different colors will be refracted to different directions after passing through the refractive lens 140 , the refractive lens 140 is disposed between the light emitting component 120 and the photosensitive device 130 so that the first light and the second light can be emitted to different directions after passing through the refractive lens 140 .

[0079] If all the photosensitive devices 130 are arranged on the light-exiting path of the first light refracted by the refractive lens 140, the intensity of the first light sensed by the photosensitive device 130 is the strongest. Since the photosensitive device 130 is at most partially located on the light-exiting path of the second light, the intensity of the second light sensed by the photosensitive device 130 is smaller than the intensity of the first light. That is, the photosensitive device 130 senses two lights of different intensities and can generate two different electrical signals (the first electrical signal and the second electrical signal), just like the two intensities of light sensed by the photosensitive device 130 when a fire occurs. In this way, the photoelectric smoke detector 100 can be detected to determine whether it can work normally.

[0080] Since the first light and the second light can be refracted in different directions under the action of the refracting lens 140, when setting the photosensitive device 130, it is only necessary to adjust the position of the photosensitive device 130 according to the refraction conditions of the first light and the second light, which is convenient for setting.

[0081] In this case, there is no need to make too many modifications to the photoelectric smoke detector 100, and the cost is relatively low.

[0082] The refractive lens 140 includes a silicon optical antenna for directionally refracting the first light and the second light. By setting the silicon optical antenna and utilizing its directional refraction capability, the first light and the second light can be directionally refracted, which can make the setting of the photosensitive device 130 more convenient.

[0083] Alternatively, the refractive lens 140 may be a common refracting lens, as long as the photosensitive device 130 can sense light of different intensities and send different electrical signals (first electrical signal and second electrical signal) through the light of different intensities to control the alarm device to be turned off or on.

[0084] In addition, if Fig.11 As shown, in order to facilitate the setting of the refractive lens 140, the light-exit path of the part of the first light on the light-entering side of the refractive lens 140 can be made to coincide with the light-exit path of the part of the second light on the light-entering side of the refractive lens 140. In this way, the directions of the first light and the second light passing through the refractive lens 140 are only affected by their own refractive index, and when setting the refractive lens 140, it is more convenient to measure the angle between the photosensitive device 130 and the light-emitting component 120 without considering too many external factors.

[0085] In some embodiments, the first light is red light and the second light is blue light. The wavelength band of red light and the wavelength band of blue light are quite different. Therefore, the use of red light and blue light can facilitate the setting of the photosensitive device 130 and avoid the need to set a smaller photosensitive device 130 to meet the demand due to the refractive index of the two lights being too close.

[0086] In order to emit red light and blue light, the light emitting component 120 may be of model IRB339-1C.

[0087] In this case, since the wavelength of red light is 940nm, the wavelength of blue light is 470nm, and the forward working current is 20mA, the corresponding photosensitive device 130 should be PD333-3C / H2 / L900 which is compatible with both 470nm and 940nm wavelengths. Since PD333-3C / H2 / L900 is compatible with both wavelengths, it can generate 30-50uA photocurrent when receiving red light and blue light, so both red light and blue light can meet the alarm requirements.

[0088] Of course, the first light and the second light may also be any other suitable colors, for example, the first light is red light and the second light is green light, or the first light is blue light and the second light is green light.

[0089] In other embodiments, Fig. 9As shown, in order to realize that the photosensitive device 130 is completely located on the light-emitting path of the first light, and the photosensitive device 130 is at most partially located on the light-emitting path of the second light, the photosensitive device 130 can also be directly arranged on the light-emitting path of the first light, and the photosensitive device 130 is at most partially located on the light-emitting path of the second light. For example, when the first light source 121 is turned on, the first light can be completely irradiated on the photosensitive device 130, and when the second light source 122 is turned on, the second light can be partially irradiated on the photosensitive device 130.

[0090] After some of the first light and the second light pass through the refractive lens 140 , the refraction directions of the two light rays are quite different, for example, one is obliquely upward and the other is obliquely downward, that is, the photosensitive devices 130 are not all located on the light exit path of the second light refracted by the refractive lens 140 .

[0091] In this case, in order to allow the second light to partially irradiate the photosensitive device 130, as shown in FIG. Fig.12 As shown, the photoelectric smoke detector 100 also includes a reflector 150, which is disposed in the optical detection cavity and at least partially located on the light exit path of the second light refracted by the refracting lens 140, for reflecting part of the second light refracted by the refracting lens 140 onto the photosensitive device 130.

[0092] By arranging the reflector 150 in the optical detection cavity, the reflector 150 is used to allow the second light to partially irradiate the photosensitive device 130, so that the photosensitive device 130 can sense the second light of a certain intensity. At the same time, since the second light sensed by the photosensitive device 130 is obtained by reflection from the reflector 150, the position of the photosensitive device 130 can be reasonably set to meet the need of detecting whether the photoelectric smoke detector 100 can work normally, without the need to modify the photosensitive device 130 to meet the need of detecting whether the photoelectric smoke detector 100 can work normally.

[0093] The reflector 150 includes a baffle, and the baffle and the housing 110 are an integrally formed structure. The baffle is used as the reflector 150 to reflect the second light. The baffle has a simple structure and is easy to set up. The baffle and the housing 110 are designed as an integrally formed structure, which can increase the structural strength of the baffle and the housing 110, and does not require secondary processing, which is convenient for manufacturing.

[0094] Of course, the reflector 150 may also be any other component capable of reflecting light.

[0095] On this basis, in order to be able to regularly detect the photoelectric smoke detector 100 to determine whether it can work normally.

[0096] The photoelectric smoke detector self-maintenance system 10 of the present application further includes a timing device, which is electrically connected to the controller;

[0097] The controller is configured to: when the timing device reaches a first preset time point, control the first light source 121 of the light emitting component 120 of the photoelectric smoke detector 100 to turn on, and the second light source 122 of the light emitting component 120 of the photoelectric smoke detector 100 to turn off; when the timing device reaches a second preset time point, control the first light source 121 to turn off, and the second light source 122 to turn on;

[0098] Alternatively, when the timing device reaches a first preset time point, the first light source 121 is turned off and the second light source 122 is turned on. When the timing device reaches a second preset time point, the first light source 121 is controlled to be turned on and the second light source 122 is turned off.

[0099] By setting a timing device, when the photoelectric smoke detector 100 is a diffuse light type photoelectric smoke detector, when the photoelectric smoke detector 100 needs to be tested, the first light source 121 is automatically turned on and the second light source 122 is turned off. When the test is completed, the first light source 121 is automatically turned off and the second light source 122 is turned on, so that the photoelectric smoke detector 100 is in a normal state.

[0100] Alternatively, when the photoelectric smoke detector 100 is a dimming type photoelectric smoke detector, when the photoelectric smoke detector 100 needs to be tested, the second light source 122 is automatically turned on and the first light source 121 is turned off. When the test is completed, the second light source 122 is automatically turned off and the first light source 121 is turned on, so that the photoelectric smoke detector 100 is in a normal state.

[0101] By setting a timing device, multiple photoelectric smoke detectors 100 can be tested regularly, thereby ensuring that a faulty photoelectric smoke detector 100 can be found in time.

[0102] In some embodiments, the photoelectric smoke detector 100 can be remotely detected through a cloud platform or an APP, which is convenient and quick.

[0103] In order to more clearly understand the detection process of the photoelectric smoke detector self-maintenance system 10 in the present application, a detailed description is given below in a specific embodiment.

[0104] The dimming photoelectric smoke detector is used as an example for introduction.

[0105] In a normal state, that is, when the photoelectric smoke detector 100 is not detecting, the first light source 121 is turned on, and the second light source 122 is turned off. At this time, all the photosensitive devices 130 are set on the light path of the first light refracted by the silicon optical antenna. At this time, the photosensitive device 130 can sense the maximum light intensity and send a first electrical signal to the alarm device. At this time, the alarm device is in a closed state. This process is equivalent to the normal operation of the photoelectric smoke detector self-maintenance system 10 when there is no fire.

[0106] In the detection state, that is, when the photoelectric smoke detector 100 is detected, the first light source 121 is turned off, and the second light source 122 is turned on. At this time, the photoelectric smoke detector 100 is partially located on the light path of the second light refracted by the silicon optical antenna. At this time, the intensity of the second light sensed by the photosensitive device 130 is less than the intensity of the first light sensed. At this time, the photosensitive device 130 can send a second electrical signal to the alarm device. This process is equivalent to the normal operation of the photoelectric smoke detector self-maintenance system 10 when a fire occurs.

[0107] At this time, due to the difference between the first electrical signal and the second electrical signal, the alarm device should sound an alarm. If it sounds an alarm, it means that the photoelectric smoke detector 100 is normal. If it does not sound an alarm, it means that the photoelectric smoke detector 100 is faulty.

[0108] Through the above operations, different working states of the dimming type photoelectric smoke detector 100 in a normal state and in a fire state are simulated, so as to detect the photoelectric smoke detector 100 and determine whether it is damaged.

[0109] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A photoelectric smoke detector, used to be electrically connected to an alarm device, characterized in that: include: A housing having an optical detection cavity therein; A light emitting component is disposed in the optical detection cavity, the light emitting component comprises a first light source and a second light source, the first light source is used to emit a first light, and the second light source is used to emit a second light; A photosensitive device is disposed in the optical detection cavity, and the photosensitive device is electrically connected to the alarm device; the photosensitive device is entirely located on the light-emitting path of the first light, and at most a portion of the photosensitive device is located on the light-emitting path of the second light; When the first light source is turned on and the second light source is turned off, the photosensitive device generates a first electrical signal according to the first light, and transmits the first electrical signal to the alarm device; When the first light source is turned off and the second light source is turned on, the photosensitive device generates a second electrical signal according to the second light, and transmits the second electrical signal to the alarm device; In the case where the photoelectric smoke detector is a dimming type photoelectric smoke detector, if the alarm device receives the first electrical signal but does not give an alarm, and receives the second electrical signal but gives an alarm, the photoelectric smoke detector is normal; if the alarm device receives the first electrical signal but does not give an alarm, and receives the second electrical signal but does not give an alarm, the photoelectric smoke detector is abnormal; In the case where the photoelectric smoke detector is a diffuse light type photoelectric smoke detector, if the alarm device does not alarm when receiving the second electrical signal, but alarms when receiving the first electrical signal, the photoelectric smoke detector is normal; if the alarm device does not alarm when receiving the first electrical signal, but does not alarm when receiving the second electrical signal, the photoelectric smoke detector is abnormal; The color of the first light is different from the color of the second light; The photoelectric smoke detector further includes a refractive lens, which is disposed in the optical detection cavity and on the light-emitting side of the light-emitting component, and is used to refract the first light and the second light, so that the light-emitting path of the portion of the first light located on the light-entering side of the refractive lens is parallel to the light-emitting path of the portion of the second light located on the light-entering side of the refractive lens; The photosensitive devices are all located on the light-exiting path of the first light refracted by the refractive lens, and at most partially located on the light-exiting path of the second light refracted by the refractive lens.

2. The photoelectric smoke detector according to claim 1, characterized in that: The refractive lens includes a silicon optical antenna for directionally refracting the first light and the second light.

3. The photoelectric smoke detector according to claim 1, characterized in that: The light-exiting path of the portion of the first light located on the light-entering side of the refractive lens coincides with the light-exiting path of the portion of the second light located on the light-entering side of the refractive lens.

4. The photoelectric smoke detector according to claim 1, characterized in that: All of the photosensitive devices are not located on the light exit path of the second light refracted by the refractive lens; The photoelectric smoke detector also includes a reflector, which is arranged in the optical detection cavity and at least partially located on the light exit path of the second light refracted by the refractive lens, for reflecting part of the second light refracted by the refractive lens onto the photosensitive device.

5. The photoelectric smoke detector according to claim 4, characterized in that: The reflector comprises a baffle, and the baffle and the shell are an integrally formed structure.

6. The photoelectric smoke detector according to claim 1, characterized in that: The first light is red light, and the second light is blue light.

7. A photoelectric smoke detector self-maintenance system, characterized in that: include: At least one photoelectric smoke detector, which is the photoelectric smoke detector according to any one of claims 1 to 6; A controller electrically connected to the photosensitive device of the photoelectric smoke detector; An alarm device is electrically connected to the controller.

8. The photoelectric smoke detector self-maintenance system according to claim 7, characterized in that: The photoelectric smoke detector self-maintenance system further comprises a timing device, and the timing device is electrically connected to the controller; The controller is configured to: when the timing device reaches a first preset time point, control the first light source of the light-emitting component of the photoelectric smoke detector to turn on, and the second light source of the light-emitting component of the photoelectric smoke detector to turn off; when the timing device reaches a second preset time point, control the first light source to turn off, and the second light source to turn on; Alternatively, when the timing device reaches a first preset time point, the first light source is turned off and the second light source is turned on, and when the timing device reaches a second preset time point, the first light source is controlled to be turned on and the second light source is turned off.

9. The photoelectric smoke detector self-maintenance system according to claim 7, characterized in that: The alarm device comprises: A buzzer, electrically connected to the controller; The display device is electrically connected to the controller.

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