Air purging device

Abstract

The invention provides an air purging device. At least one dustproof air hole and at least one dust removal air hole are formed in the shell of the air purging device, so that the air inlet duct, connected with the air inlet connector, on the air duct inner core is shunted, and the dust removal duct and the dustproof duct which are independent of each other are obtained; the air flow input into the air inlet duct is guided to the dustproof air curtain opening from the dustproof air duct through the dustproof air hole to prevent external dust from entering, and meanwhile, the air flow input into the air inlet duct is guided to the lens from the dedusting air duct through the dedusting air hole to remove dust falling on the lens. The dust falling on the lens is cleaned while external dust is prevented from entering the lens.

Description

Technical Field

[0001] This application relates to the field of optical equipment protection technology, and in particular to air purging devices. Background Technology

[0002] Products with lenses, such as thermal imaging devices or pyrometers, often experience lens contamination when used in dusty environments. Take pyrometers as an example: a pyrometer is a non-contact temperature measuring instrument that uses the thermal radiation characteristics of an object to measure its surface temperature. Pyrometers are typically used in dusty environments, such as industrial temperature monitoring. Related technologies often incorporate a purging device that blows air outwards through dust-proof vents, forming a dust curtain to prevent external dust from entering the lens. However, this purging device only prevents external dust from falling onto the lens. For instance, if the purging device has not been connected to compressed air for a period of time, and dust has already fallen onto the lens, the purging device cannot remove the dust, leading to lens contamination and reduced measurement accuracy. Summary of the Invention

[0003] In view of this, this application provides an air purging device to clean dust that has fallen onto the lens.

[0004] The technical solution provided in this application is as follows: According to an embodiment of the first aspect of this application, an air purging device is provided, the air purging device being applied to a lens; the air purging device includes: The housing has an air inlet on its exterior. The housing is provided with an air intake duct that communicates with the air intake interface; The housing has a dustproof air curtain opening at one end away from the lens; the housing has at least one dustproof air hole; the dustproof air hole is used to divert the air intake duct to form a dustproof air duct; the dustproof air duct is used to direct the airflow input from the air intake interface to the dustproof air curtain opening; The housing has at least one dust removal vent, which is used to divert the air intake duct to form a dust removal duct; the dust removal duct is used to direct the airflow input from the air intake interface to the lens to remove dust from the lens.

[0005] Optionally, the line connecting the projection of the dust removal vent on the lens and the center of the lens does not coincide with the line connecting the projection of the dust prevention vent on the lens and the center of the lens.

[0006] Optionally, the cross-sectional area of ​​the dust removal duct is larger than the cross-sectional area of ​​the dust prevention duct.

[0007] Optionally, the angle between the direction of the dust removal airflow and the plane where the lens is located is smaller than the angle between the direction of the dust removal airflow and the axis of the lens; the dust removal airflow refers to the airflow flowing out from the dust removal air hole.

[0008] Optionally, the angle between the direction of the dustproof airflow and the axis of the lens is smaller than the angle between the direction of the dust removal airflow and the axis of the lens; the dust removal airflow refers to the airflow flowing out of the dust removal vent, and the dustproof airflow refers to the airflow flowing out of the dustproof vent.

[0009] Optionally, the diameter inside the housing gradually increases from the lens to the dustproof air curtain opening.

[0010] Optionally, the dust removal vents and / or the dust prevention vents are evenly distributed around the axis of the lens.

[0011] Optionally, the housing is provided with an air intake duct communicating with the air intake interface, including: The housing has an inner core for air ducts, and the inner core for air ducts is provided with an air intake duct that communicates with the air intake interface. The dustproof air curtain opening, the dustproof air hole, and the dust removal air hole are disposed on the inner core of the air duct.

[0012] Optionally, the air duct inner core is detachably installed inside the housing via a threaded connection.

[0013] Optionally, the air purging device can be detachably mounted on the lens.

[0014] As can be seen from the above technical solution, this application provides at least one dustproof air hole and at least one dust removal air hole inside the housing of the air blowing device to split the air intake air duct connected to the air intake interface on the inner core of the air duct, resulting in independent dust removal air duct and dustproof air duct. While the airflow input to the air intake air duct is guided from the dustproof air duct through the dustproof air hole to the dustproof air curtain to prevent external dust from entering, the airflow input to the air intake air duct is guided from the dust removal air duct through the dust removal air hole to the lens to remove the dust that has fallen on the lens. This achieves the goal of preventing external dust from entering while cleaning the dust that has fallen on the lens. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this application and, together with the specification, serve to explain the principles of this application.

[0016] Figure 1 A cross-sectional schematic diagram of an air purging device applied to a lens in a related art, provided as an embodiment of this application; Figure 2This is an overall structural diagram of the air purging device provided in the embodiments of this application; Figure 3 This is a schematic cross-sectional view of the air purging device provided in the embodiments of this application; Figure 4 This is a schematic diagram showing the arrangement of dustproof and dust removal vents in the air purging device provided in the embodiments of this application. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solutions provided in the embodiments of this application, and to make the above-mentioned objectives, features and advantages of the embodiments of this application more apparent and understandable, the technical solutions in the embodiments of this application will be further described in detail below with reference to the accompanying drawings.

[0018] When some optical devices with lenses, such as thermal imaging devices, visible light imaging devices, and pyrometers, are used in dusty environments, dust often adheres to the lenses of these optical devices, affecting their operation.

[0019] Specifically, taking a pyrometer as an example, a pyrometer is a non-contact temperature measuring instrument that uses the thermal radiation characteristics of an object to measure its surface temperature. The detector inside the pyrometer has a small area. In order to collect a sufficiently strong thermal radiation signal, an optical system, such as a lens, is needed to gather the radiation energy emitted from a distant target object and focus it onto the tiny detector.

[0020] Since pyrometers are typically used in dusty environments, such as industrial temperature measurement, dust adhering to the lens of the pyrometer can significantly affect the accuracy of temperature measurement.

[0021] Specifically, dust particles absorb infrared radiation, which weakens the signal received by the pyrometer's detector and affects the accuracy of temperature measurement. At the same time, irregular dust accumulation changes the refractive index of the optical path, causing the temperature measurement point to shift and the temperature measurement to be inaccurate. Furthermore, the interference radiation generated by the temperature difference between the dust itself and the target temperature may also lead to a large temperature measurement deviation in ultra-high temperature measurements.

[0022] Therefore, pyrometers in dusty environments need to be equipped with a purging device to prevent dust, in order to ensure image clarity and temperature measurement accuracy.

[0023] The pyrometer in the related technology is equipped with a purging device that forms a dust curtain by blowing outwards through a set of dustproof vents, preventing external dust from entering the lens glass. However, this purging device can only prevent external dust from falling onto the lens. For example, if the purging device has not been connected to compressed air for a period of time and dust has already fallen onto the lens, the purging device cannot remove the dust from the lens, resulting in a decrease in the measurement accuracy of the pyrometer.

[0024] Of course, other products with lenses and similar working environments, such as thermal imaging devices and visible light imaging devices, usually also have the above problems.

[0025] Please refer to Figure 1 , Figure 1 This is a cross-sectional schematic diagram of an air purging device applied to a lens in a related art, provided as an embodiment of this application.

[0026] In this embodiment, Figure 1 The cross-sectional view on the left is a cross-section obtained by cutting the air purging device according to the cutting plane defined by AA in the image on the right.

[0027] like Figure 1 As shown, the main body of the air purging device is typically composed of a housing (1), with a compressed air inlet (11) designed at one end. After the compressed air enters a centralized chamber (12) inside the device through the inlet (11), its flow path is directly guided to a single set of dustproof air holes (13). This set of air holes (13) is typically composed of multiple tiny holes, and the axial direction of all the air holes (13) is set to be uniformly arranged around the central axis of the air purging device at a fixed, slightly outward angle (e.g., 15° to 30°), so that the airflow ejected from the dustproof air holes (13) diffuses outward.

[0028] When compressed air is continuously supplied, the high-speed airflow ejected from this set of air holes (13) forms an outwardly diffused air curtain at the dustproof air curtain opening (14) on the left side of the device. This air curtain constitutes a barrier that can effectively block and blow away air from the external environment that attempts to approach and adhere to the lens surface (i.e., Figure 1 The dust particles at the right-side threaded connection point are theoretically kept relatively clean in the lens area.

[0029] However, because all airflow is directed to the outside, the device lacks any internal airflow channels or cleaning mechanisms that direct airflow towards the lens itself. If the compressed air supply is interrupted (e.g., during equipment maintenance, air source failure, or valve closure), external dust will adhere to the lens. Even if the air supply is restored, the device cannot remove this already deposited dust because its airflow direction is always outward, failing to effectively blow and clean the lens surface.

[0030] Based on this, this application proposes an air purging device that can clean dust that has fallen onto the lens while preventing external dust from entering.

[0031] Please refer to Figure 2 , Figure 2 This is an overall structural diagram of the air purging device provided in the embodiments of this application.

[0032] like Figure 2 As shown, the purging device consists of three parts: a housing (2), an inner core of the air duct (3), and an air inlet (4).

[0033] Specifically, the air inlet (4) here can be a G1 / 4 external thread interface, which facilitates quick connection of the factory air supply line by the user. The housing (2) can be made of durable metal or engineering plastic to withstand the impact and corrosion common in industrial environments.

[0034] It should be noted that the air duct core (3) here can be an independent structure or a part of the shell (2). That is, the air duct core (3) can be integrally formed with the shell (2). As the internal structure of the shell (2), this application does not impose any restrictions on this.

[0035] The air intake interface (4) can be separated from the housing (2), that is, the air intake interface (4) can be detachably connected to the housing (2); or, the air intake interface (4) can be integrally formed with the housing (2), that is, the air intake interface is part of the housing (2), and this application does not limit this.

[0036] The specific structure of the inner core (3) of the air duct will be described in detail below. Figure 3 A detailed description will not be provided here.

[0037] Please refer to Figure 3 , Figure 3 This is a cross-sectional schematic diagram of the air purging device provided in an embodiment of this application.

[0038] in, Figure 3 The cross-sectional view on the left is a cross-section obtained by cutting the air purging device according to the cutting plane defined by AA in the image on the right.

[0039] like Figure 3 As shown, the air purging device is applied to the lens (51), and the air purging device may include: The housing (2) has an air inlet on its exterior; The housing (2) has an air intake duct (31) inside that is connected to the air intake interface (4); The housing (2) has a dustproof air curtain (32) at the end away from the lens (51); the housing (2) has at least one dustproof air hole (33); the dustproof air hole (33) is used to divert the air intake duct to obtain a dustproof air duct (34); the dustproof air duct (34) is used to direct the airflow input from the air intake interface (4) to the dustproof air curtain (32). The housing (2) has at least one dust removal air hole (35) inside. The dust removal air hole (35) is used to divert the air intake duct (31) to obtain the dust removal duct (36). The dust removal duct (36) is used to direct the airflow input from the air intake interface (4) to the lens (51) for dust removal.

[0040] In this embodiment, the dustproof air hole (33) can be set inside the housing (2) near the dustproof air curtain opening (32) to guide the airflow to the dustproof air curtain opening (32) and prevent external dust from entering; the dust removal air hole (35) can be set inside the housing (2) near the lens (51) to guide the airflow to the lens (51) and remove the dust attached to the lens (51).

[0041] It should be noted that the lens (51) here can be the lens of any optical device (5), such as a pyrometer, thermal imaging device, visible light imaging device, etc. This application does not impose any restrictions on this.

[0042] The intake air duct (31) is split into two air ducts, namely the dust removal air duct (36) and the dust prevention air duct (34). The original dust prevention function is performed through the dust prevention air duct (34), and the newly added dust removal function is performed through the dust removal air duct (36). At the same time, there is no need to increase the number of intake ports (4).

[0043] As an example, the cross-sectional area of ​​the dust removal duct (36) is larger than that of the dust prevention duct (34).

[0044] Since the lens (51) that needs to be dusted is located at the innermost part of the air blowing device, in order to ensure that the dust attached to the lens (51) can be removed first, the air flow rate of the dust removal channel can be controlled to be greater than that of the dust prevention channel. For example, the cross-sectional area of ​​the dust removal channel (36) can be set to be greater than that of the dust prevention channel (34).

[0045] The cross-sectional area of ​​the air duct refers to the flow cross-sectional area of ​​the air duct, that is, the maximum radial dimension of the air duct perpendicular to the airflow direction. The larger the cross-sectional area of ​​the air duct, the greater the airflow per unit time.

[0046] In this embodiment, the shapes of the dustproof vent (33) and the dust removal vent (35) can be circular, rectangular, slit-shaped, etc., and this application does not impose any restrictions on them.

[0047] When the dustproof vent (33) and the dust removal vent (35) are circular, the width of the dust removal duct (36) can be set to be greater than the width of the dustproof duct (34), and the diameter of the dust removal vent (35) can be set to be greater than the diameter of the dustproof vent (33).

[0048] When the dustproof vent (33) and the dust removal vent (35) are rectangular or slit-shaped, the area of ​​the dust removal vent (35) can be larger than the area of ​​the dustproof vent (33).

[0049] The following description uses the example of dustproof vent (33) and dust removal vent (35) being circular vents.

[0050] As an example, the width of the dust removal duct (36) is designed to be 1 mm, the diameter of the dust removal air hole (35) is designed to be 3 mm, the width of the dust prevention duct (34) is designed to be 0.7 mm, and the diameter of the dust prevention air hole (33) is designed to be 2 mm. By reasonably distributing the airflow, the dust removal airflow is greater than the dust prevention airflow, so as to ensure that the dust removal dust is discharged first.

[0051] In this embodiment, the dust removal vents (35) and / or the dust prevention vents (33) can be evenly distributed around the axis of the lens (51).

[0052] As an example, in order to effectively cover the dustproof and dust removal areas, the dust removal vents (35) and / or dustproof vents (33) can be evenly distributed around the central axis of the lens (51).

[0053] In addition, in order to avoid the dust removal airflow and the dust prevention airflow interfering with each other and causing turbulence, when setting the dust removal air hole (35) and the dust prevention air hole (33), ensure that the line connecting the projection of the dust removal air hole (35) on the lens (51) and the center of the lens (51) does not coincide with the line connecting the projection of the dust prevention air hole (33) on the lens (51) and the center of the lens (51).

[0054] Please refer to Figure 4 , Figure 4 This is a schematic diagram showing the arrangement of dustproof and dust removal vents in the air purging device provided in the embodiments of this application.

[0055] like Figure 4 As shown, eight dustproof vents and four dust removal vents are evenly distributed in the inner core of the air duct.

[0056] To avoid interference and turbulence between the dust removal and dust suppression airflows, the dust suppression and dust removal vents can be arranged at different angles. This ensures that the line connecting the projection of any dust removal vent onto the lens and the center of the lens glass does not coincide with the line connecting the projection of any dust suppression vent onto the lens glass and the center of the lens glass. For example... Figure 4 The arrangement of elements.

[0057] In this embodiment, in order to ensure that the dust removal airflow can remove the dust attached to the lens (51), the angle between the direction of the dust removal airflow and the plane where the lens (51) is located can be set to be smaller than the angle between the direction of the dust removal airflow and the axis of the lens (51); the dust removal airflow refers to the airflow flowing out from the dust removal air hole (35).

[0058] For example, the dust removal airflow is blown towards the lens (51). The angle between the direction of the dust removal airflow and the axis of the lens (51) can be designed to be 60°, that is, the angle between the direction of the dust removal airflow and the plane where the lens (51) is located is 30°. In this way, it can ensure that the dust removal airflow can be reflected back to the dustproof air curtain opening (32) after it blows to the lens (51), and it can also ensure that the airflow forms a strong shearing force with the center of the lens (51), thereby improving the dust removal effect.

[0059] The smaller the angle between the dust removal airflow direction and the lens (51) surface, the closer the dust removal airflow is to the lens surface, and the higher the shearing force generated.

[0060] In this embodiment, the angle between the direction of the dustproof airflow and the axis of the lens (51) can be set to be smaller than the angle between the direction of the dust removal airflow and the axis of the lens (51); the dust removal airflow refers to the airflow flowing out from the dust removal air hole, and the dustproof airflow refers to the airflow flowing out from the dustproof air hole, so as to ensure that the dustproof airflow will not interfere with the dust removal airflow reflected back by the lens glass.

[0061] Specifically, the angle between the direction of the dust-proof airflow blowing towards the dust-proof air curtain opening (32) and the axis of the lens (51) can be designed to be a small angle, such as 20°, to ensure that the dust-proof airflow can be discharged along the inner wall surface (37) and to ensure that a 360° air curtain is formed at the dust-proof air curtain opening (32). At the same time, the discharge of the dust-proof airflow along the inner wall surface (37) can further avoid the interference between the dust removal airflow and the dust-proof airflow, and the generation of turbulence.

[0062] In this embodiment, the diameter of the inner wall surface inside the housing (2) gradually increases from the lens (51) to the dustproof air curtain opening (32). That is, the inner wall surface (37) inside the housing (2) can be set as a cone shape, which is conducive to the internal dust flowing out with the airflow. At the same time, the air curtain generated at the dustproof air curtain opening (32) also helps to prevent external dust from penetrating into the internal lens (51).

[0063] It should be noted that the above structural description is based on the fact that the inner core of the air duct (3) and the shell (2) are an integral structure, that is, the inner core of the air duct (3) is described as an internal structure of the shell (2). In this embodiment, the inner core of the air duct (3) can be an independent structure and detachably connected to the shell (2). That is: the inner core of the air duct is provided inside the shell, and the inner core of the air duct is provided with an air intake duct that communicates with the air intake interface; the dustproof air curtain, dustproof air hole and dust removal air hole are provided on the inner core of the air duct.

[0064] Specifically, the housing (2) has an internal air duct cavity and an external air inlet (4). The inner core (3) of the air duct is located inside the air duct cavity; the inner core (3) of the air duct is provided with an air intake duct (31) that is connected to the air intake interface (4). The first end of the inner core (3) of the air duct away from the lens (51) is provided with a dustproof air curtain opening (32); the inner core (3) of the air duct is provided with at least one dustproof air hole (33); the dustproof air hole is used to divert the air intake air duct (31) to obtain a dustproof air duct (34); the dustproof air duct (34) is used to direct the airflow input from the air intake interface (4) to the dustproof air curtain opening (32). The inner core (3) of the air duct is provided with at least one dust removal air hole (35). The dust removal air hole (35) is used to divert the air intake air duct (31) to obtain the dust removal air duct (36). The dust removal air duct (36) is used to direct the airflow input from the air intake interface (4) to the lens (51) to remove dust from the lens (51).

[0065] Similarly, the dustproof vent (33) can be set in the inner core (3) of the air duct near the dustproof air curtain opening (32) to guide the airflow to the dustproof air curtain opening (32) and prevent external dust from entering; the dust removal vent (35) can be set in the inner core (3) of the air duct near the lens (51) to guide the airflow to the lens (51) and remove the dust attached to the lens (51).

[0066] The air intake duct (31), dust removal duct (36), dust removal vent (35), dustproof duct (34), and dustproof vent (33) can all be integrated into the duct core (3) as a structural component and connected to the housing (2) via the first thread (21). This simplifies the design and allows the component to be integrated as a general-purpose part into other products requiring dust removal and prevention. Furthermore, the duct core (3) can also be connected to the housing (2) via snap-fit, flange, or other means; this application does not impose any restrictions on this connection.

[0067] Meanwhile, the air purging device can also be detachably mounted on the lens (51), which can be the lens of an optical device (5), such as a pyrometer, thermal imaging device, or visible light imaging device. Specifically, the air purging device can be mounted on the lens (51) by means of a threaded connection, for example, by means of a second thread (22), and connected to the optical device (5). In addition, the air purging device can also be connected to the lens (51) of the optical device (5) by means of a clip, flange, etc., and this application does not impose any restrictions on this.

[0068] In this embodiment, both the first thread (21) and the second thread (22) can be M50 threads, and this application does not impose any restrictions on this.

[0069] As an example, considering that in some practical scenarios, the viscosity of dust is relatively high, such as in temperature monitoring scenarios in chemical and cement manufacturing, the dust may contain oil or moisture, and it is difficult to remove the dust already attached to the lens (51) by airflow shearing alone. In this case, the number of dust removal vents (35) can be increased, and the dust removal vents (35) and dust prevention vents (33) can be arranged non-uniformly and alternately, so that the dust removal airflow forms multiple interfering vortex fields on the lens surface, thereby agitating the dust.

[0070] For example, six dust removal vents (35) and eight dust prevention vents (33) can be used, and they can be distributed in a non-uniform and staggered manner. The non-uniform and staggered distribution here means that, under the premise that the line connecting the projection of the dust removal vent (35) on the lens (51) and the center of the lens (51) does not coincide with the line connecting the projection of the dust prevention vent (33) on the lens (51) and the center of the lens (51), the angle between the projection of each dust removal vent (35) on the lens (51) and the line connecting the center of the lens (51) is not exactly the same.

[0071] For example, the first angle between the line connecting the projection of the first dust removal vent on the lens and the center of the lens and the line connecting the projection of the second dust removal vent on the lens and the center of the lens is 20°, and the second angle between the line connecting the projection of the second dust removal vent on the lens and the center of the lens and the line connecting the projection of the third dust removal vent on the lens and the center of the lens is 30°. This application does not impose any limitations on this.

[0072] Furthermore, the taper of the inner wall surface (37) of the air duct core (3) can be increased so that the diameter of the inner wall surface (37) near the dustproof air curtain opening (32) is greater than the diameter of the inner wall surface (37) near the lens (51), so that the airflow carrying dust rebounding from the lens surface generates a stronger suction effect and accelerates its discharge to the dustproof air curtain opening (32).

[0073] For dust with high viscosity, the dust removal airflow first stirs the high viscosity dust in the form of a vortex, causing it to detach from the lens (51) surface. Subsequently, under the guidance and suction of the conical inner wall (37), the loosened dust and the dustproof air curtain airflow quickly merge and are efficiently discharged to the outside of the system, greatly reducing the risk of dust circulating or re-attaching inside the device.

[0074] This concludes the discussion on... Figure 3 Description of the components of the air purging device.

[0075] The following is still in the format of Figure 3 Taking the air purging device as an example, the process of realizing the dust prevention and dust removal functions is briefly introduced: When the external air supply line is connected to the G1 / 4 air inlet (4), compressed air enters the inlet of the air duct core (3). The airflow first converges into an initial air inlet duct (31), and is then split into two parallel air ducts that are completely independent in space and distinct in function: one is a dust removal duct (36) for removing existing dust from the lens (51), and the other is a dustproof duct (34) for preventing external dust from entering. This split design is the basis for realizing the dual function of the air purging device of this application.

[0076] To ensure that the majority of airflow energy is used for the most critical dust removal task, the geometry of the two ducts has been optimized. For example, the width of the dust removal duct (36) is set to 1 mm, connecting four dust removal air holes (35) with a diameter of 3 mm; while the width of the dust prevention duct (34) is set to 0.7 mm, connecting eight dust prevention air holes (33) with a diameter of 2 mm. This differentiated size configuration ensures that, under the same inlet pressure, more airflow can be allocated to the dust removal duct (36), thereby providing sufficient airflow intensity and flow rate for active dust removal.

[0077] The airflow distributed to the dust removal duct (36) is ejected through four dust removal air holes (35). The direction of the dust removal airflow from these four dust removal air holes (33) is at a 60° angle to the axis of the lens (51). This angle ensures that the ejected airflow can impact the surface of the lens (51) at the most ideal angle of incidence. When the dust removal airflow impacts the lens (51), since the surface of the lens (51) is perpendicular to its axis, i.e., at a 90° angle, the actual angle between the dust removal airflow and the surface of the lens (51) is 30°, which can generate a strong shearing effect on the surface of the lens (51). This shearing action can effectively clean the dust particles that have adhered to the surface of the lens (51), thus completing the function of active dust removal. The removed dust is then blown out from the dust curtain opening (32) by the incident airflow and the reflected airflow it generates.

[0078] The airflow distributed to the dustproof duct (34) is ejected through eight dustproof vents (33). The angle between the direction of the dustproof airflow from these vents (33) and the axis of the lens (51) is set to 20°. This angle allows the ejected dustproof airflow to closely and almost parallelly adhere to the inner wall surface (37) of the duct core (3) and move to the dustproof air curtain opening (32). The inner wall surface (37) is designed with a diameter that gradually increases from the lens (51) to the dustproof air curtain opening (32). This funnel-shaped structure guides and accelerates the airflow. After the airflow is ejected along the wall at this angle, it quickly converges and forms a continuous and stable annular air curtain barrier, i.e., the dustproof air curtain, at the dustproof air curtain opening (32). This air curtain disperses and blocks dust particles that attempt to invade from the outside, effectively preventing new dust from contacting the lens (51). In addition, the dustproof air vent (33) and the dust removal air vent (35) are spatially staggered, which effectively avoids the two airflows from interfering with each other inside the device and causing turbulence, thereby ensuring the independence and efficiency of their respective functions.

[0079] Ultimately, the dust carried by the internal dust removal airflow and the external dust blocked by the air curtain are swept away by the airflow and discharged from the device.

[0080] As can be seen, this application successfully achieves the functions of on-demand airflow distribution, active dust removal, continuous dust prevention, and effective waste dust discharge, ensuring that the lens of the optical equipment can maintain a high level of cleanliness for a long time even in harsh industrial environments with extremely high dust concentrations, thereby fundamentally guaranteeing its temperature measurement accuracy.

[0081] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. An air purge device, characterized by, The air blowing device is applied to a lens; the air blowing device comprises: a shell, which is externally provided with an air inlet interface; the shell is internally provided with an air inlet air duct in communication with the air inlet interface; an air curtain opening is arranged at an end of the shell away from the lens; at least one dustproof air hole is arranged in the shell; the dustproof air hole is used for shunting the air inlet air duct to obtain a dustproof air duct; the dustproof air duct is used for guiding the airflow input by the air inlet interface to the dustproof air curtain opening; at least one dust removal air hole is arranged in the shell; the dust removal air hole is used for shunting the air inlet air duct to obtain a dust removal air duct; the dust removal air duct is used for guiding the airflow input by the air inlet interface to the lens to remove dust from the lens.

2. The apparatus of claim 1, wherein, The projection of the dust removal air hole on the lens and the line between the center of the lens and the projection of the dustproof air hole on the lens do not coincide.

3. The apparatus of claim 1, wherein, The cross-sectional area of the dust removal air duct is greater than that of the dustproof air duct.

4. The apparatus of claim 1, wherein, The angle between the flow direction of the dust removal airflow and the plane where the lens is located is smaller than the angle between the flow direction of the dust removal airflow and the axis of the lens; the dust removal airflow refers to the airflow flowing out of the dust removal air hole.

5. The apparatus of claim 1, wherein, The angle between the flow direction of the dust removal airflow and the axis of the lens is smaller than the angle between the flow direction of the dust removal airflow and the axis of the lens; the dust removal airflow refers to the airflow flowing out of the dust removal air hole, and the dustproof airflow refers to the airflow flowing out of the dustproof air hole.

6. The apparatus of claim 1, wherein, The diameter of the shell inside gradually increases from the lens to the dustproof air curtain opening.

7. The apparatus of claim 1, wherein, The dust removal air hole and / or the dustproof air hole are uniformly distributed around the axis of the lens.

8. The apparatus of claim 1, wherein, The shell is internally provided with an air inlet air duct in communication with the air inlet interface, comprising: the shell is internally provided with an air duct inner core, and the air duct inner core is provided with an air inlet air duct in communication with the air inlet interface; wherein the dustproof air curtain opening, the dustproof air hole and the dust removal air hole are arranged on the air duct inner core.

9. The apparatus of claim 8, wherein, The air duct inner core is detachably installed in the shell by screw connection.

10. The apparatus of any one of claims 1 to 9, wherein, The air blowing device is detachably installed on the lens.

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