Adjusting holder base of smoke detector and smoke detector

Abstract

The invention provides an adjusting holder base of a smoke detector and the smoke detector, and belongs to the field of smoke detectors. The adjusting holder base of the smoke detector comprises a bottom shell, a rotary table and a fixed cover, the bottom shell comprises a convex hemispherical part, and a plurality of fixing columns are arranged on the outer surface of the hemispherical part; the rotary table comprises a concave spherical bowl part, the spherical bowl part is provided with a plurality of avoiding holes, the spherical bowl part covers the hemispherical part, the multiple avoiding holes sleeve the multiple fixing columns respectively, gaps are formed between the hole walls of the avoiding holes and the fixing columns, and the inner surface of the spherical bowl part is in sliding fit with the outer surface of the hemispherical part; the fixing cover is located on the side, away from the hemisphere part, of the spherical bowl part and connected with the multiple fixing columns so as to limit the rotary table to move in the direction away from the hemisphere part. And the spherical bowl part is in sliding fit with the hemispherical part, so that the turntable can rotate in any direction relative to the bottom shell. The detector body of the smoke detector can be installed on the rotary table, so that the detector body can rotate in any direction relative to the bottom shell along with the rotary table, and adjustment of the smoke detector is facilitated.

Description

Technical Field

[0001] This application relates to the field of smoke detectors, and particularly to an adjustable pan-tilt base for a smoke detector and a smoke detector. Background Art

[0002] Smoke detectors are widely used in various fire alarm systems and can trigger an alarm when a fire occurs.

[0003] The line-type infrared beam smoke detector is a common type of smoke detector. When in use, it is placed opposite to a reflector. This type of smoke detector structurally includes a transmitting part and a receiving part. The transmitting part emits an infrared beam of a certain intensity. After being reflected by the reflector, the receiving part synchronously collects and amplifies the returned infrared beam, and analyzes and judges the collected signal through a built-in single-chip microcomputer. When smoke enters the detection area, the smoke blocks the infrared beam, reducing the intensity of the infrared light received by the receiving part, thereby triggering an alarm.

[0004] The placement requirements for the line-type infrared beam smoke detector and the reflector are relatively high. During installation, it is generally necessary to adjust the line-type infrared beam smoke detector so that the infrared beam emitted by the transmitting part can irradiate the reflector and the receiving part can receive the reflected infrared beam. However, the adjustment structure of the line-type infrared beam smoke detector in the related art is usually relatively complex. During adjustment, it is often necessary to disassemble and reinstall some structures. The disassembly and installation process is not only cumbersome, but also the adjusted angle is likely to change again during the reinstallation process, making the adjustment process very inconvenient. Summary of the Invention

[0005] The embodiments of this application provide an adjustable pan-tilt base for a smoke detector and a smoke detector, which can facilitate the adjustment of the smoke detector without the need for disassembly and reinstallation of the structure. The technical solutions are as follows:

[0006] In a first aspect, the embodiments of this application provide an adjustable pan-tilt base for a smoke detector. The adjustable pan-tilt base for the smoke detector includes a bottom shell, a turntable, and a fixing cover. The bottom shell includes a convex hemispherical portion, and the outer surface of the hemispherical portion has a plurality of fixing posts. The turntable includes a concave spherical bowl portion. The spherical bowl portion has a plurality of avoidance holes. The spherical bowl portion covers the hemispherical portion. The plurality of avoidance holes are respectively sleeved outside the plurality of fixing posts, and there is a gap between the hole wall of the avoidance hole and the fixing post. The inner surface of the spherical bowl portion is in sliding fit with the outer surface of the hemispherical portion. The fixing cover is located on the side of the spherical bowl portion away from the hemispherical portion and is connected to the plurality of fixing posts to limit the turntable from moving in a direction away from the hemispherical portion.

[0007] In some examples, the outer surface of the spherical bowl portion is a hemispherical convex surface, and the fixed cover fits onto the outer surface of the spherical bowl portion.

[0008] In some examples, the bottom shell further includes a first cylindrical portion that is sleeved outside the hemispherical portion, and one end of the first cylindrical portion is connected to the hemispherical portion;

[0009] The turntable further includes a second cylindrical portion that is sleeved outside the spherical bowl portion, and one end of the second cylindrical portion is connected to the spherical bowl portion. One ends of the spherical bowl portion and the second cylindrical portion are both located in the first cylindrical portion, and there is a gap between the second cylindrical portion and the first cylindrical portion.

[0010] In some examples, the turntable further includes a third cylindrical portion that is sleeved outside the second cylindrical portion and is connected to the other end of the second cylindrical portion. The third cylindrical portion is located outside the first cylindrical portion and there is a gap between the third cylindrical portion and the first cylindrical portion.

[0011] In some examples, two limiting protrusions are provided at the end of the second cylindrical portion connected to the spherical bowl portion, and the two limiting protrusions are arranged at intervals along the circumferential direction of the second cylindrical portion;

[0012] The bottom shell further includes a limiting portion that is located in the first cylindrical portion and between the hemispherical portion and the first cylindrical portion;

[0013] The limiting portion is located between the two limiting protrusions and has a gap with at least one of the limiting protrusions.

[0014] In some examples, a first through hole is provided in the middle of the hemispherical portion, a second through hole is provided in the middle of the spherical bowl portion, the second through hole communicates with the first through hole, a third through hole is provided in the middle of the fixed cover, the third through hole communicates with the second through hole, and the first through hole, the second through hole and the third through hole are used for arranging wire harnesses;

[0015] An annular sealing ring is fixed on the inner surface of the spherical bowl portion. The annular sealing ring abuts against the outer surface of the hemispherical portion to form a seal, and the annular sealing ring surrounds the first through hole, the second through hole and the third through hole.

[0016] In some examples, the annular sealing ring and the turntable are secondary injection molded parts.

[0017] In some examples, there is an annular gap between the edge of the inner surface of the spherical bowl portion and the outer surface of the hemispherical portion;

[0018] The adjustment pan-tilt base further includes a locking ring which is sleeved outside the hemispherical portion and can move in a direction away from the hemispherical portion into the annular gap to lock the turntable.

[0019] In some examples, one side of the locking ring away from the spherical bowl portion has a plurality of grooves which are circumferentially spaced apart along the locking ring.

[0020] The adjustment pan-tilt base further includes a pushing ring which is sleeved outside the hemispherical portion. The pushing ring is located on the side of the locking ring away from the spherical bowl portion and can rotate relative to the locking ring. One side of the pushing ring close to the locking ring has a plurality of wedge-shaped protrusions which are respectively located in the plurality of grooves. The wedge-shaped protrusions are used to move out of the grooves along with the pushing ring to push the locking ring to move towards the annular gap.

[0021] In a second aspect, an embodiment of the present application further provides a smoke detector which includes a detector main body and any one of the adjustment pan-tilt bases as described in the first aspect, and the detector main body is connected to the turntable.

[0022] The beneficial effects brought by the technical solutions provided by the embodiments of the present application at least include:

[0023] By covering the concave spherical bowl portion of the turntable outside the convex hemispherical portion of the bottom case, and the spherical bowl portion is in sliding fit with the hemispherical portion, the turntable can rotate relative to the bottom case in any direction. By providing a plurality of avoidance holes in the spherical bowl portion and a plurality of fixing columns on the outer surface of the hemispherical portion, and the plurality of fixing columns are respectively located in the plurality of avoidance holes, and there is a gap between the hole wall of the avoidance hole and the outer side wall of the fixing column, the turntable can rotate relative to the bottom case within a certain range without being restricted by the fixing columns. By providing a fixing cover on the side of the spherical bowl portion away from the hemispherical portion and connecting the fixing cover to the plurality of fixing columns, the spherical bowl portion is restricted between the hemispherical portion and the fixing cover, avoiding the separation of the spherical bowl portion from the hemispherical portion. The detector main body of the smoke detector can be installed on the turntable, so that the detector main body can rotate relative to the bottom case in any direction along with the turntable, facilitating the adjustment of the smoke detector. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a schematic structural diagram of a smoke detector provided by an embodiment of the present application;

[0026] Figure 2 It is a schematic structural diagram of an adjustment cloud platform base of a smoke detector provided by an embodiment of the present application;

[0027] Figure 3 It is an assembly schematic diagram of a bottom shell and a turntable provided by an embodiment of the present application;

[0028] Figure 4 It is a schematic internal structure diagram of an adjustment cloud platform base provided by an embodiment of the present application;

[0029] Figure 5 It is a schematic structural diagram of a turntable provided by an embodiment of the present application.

[0030] Reference numerals in the drawings:

[0031] 10 - Detector main body;

[0032] 20 - Adjustment cloud platform base; 21 - Bottom shell; 21a - Annular gap; 211 - Hemispherical portion; 211a - First through hole; 212 - Fixed column; 213 - First cylindrical portion; 214 - Limiting portion; 22 - Turntable; 221 - Ball bowl portion; 2211 - Annular sealing ring; 221a - Avoidance hole; 221b - Second through hole; 222 - Second cylindrical portion; 223 - Third cylindrical portion; 224 - Limiting protrusion; 23 - Fixed cover; 23a - Third through hole; 24 - Locking ring; 241 - Ear plate; 24a - Groove; 25 - Pushing ring; 251 - Wedge-shaped protrusion; 26 - Adjusting member; 27 - Waterproof joint. Detailed implementation manners

[0033] In the following description, for the purpose of illustration rather than limitation, specific details such as specific system structures and technologies are set forth in order to provide a thorough understanding of the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0034] It should also be understood that the term "and / or" used in the specification and appended claims of the present application refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0036] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0037] In addition, in the description of the specification and the appended claims of the present application, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0038] The reference to "one embodiment" or "some embodiments" etc. described in the specification of the present application means that specific features, structures or characteristics described in connection with that embodiment are included in one or more embodiments of the present application. Thus, statements such as "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments" etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "comprising", "including", "having" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways. "Plurality" means two or more.

[0039] Figure 1 It is a schematic structural diagram of a smoke detector provided by an embodiment of the present application. As Figure 1 shown, the smoke detector includes a detector main body 10 and an adjustable pan-tilt base 20, and the detector main body 10 is installed on the adjustable pan-tilt base 20.

[0040] Figure 2 It is a schematic structural diagram of an adjustable pan-tilt base of a smoke detector provided by an embodiment of the present application. As Figure 2 shown, the adjustable pan-tilt base of the smoke detector includes a bottom shell 21, a turntable 22 and a fixing cover 23. In the smoke detector, the detector main body 10 can be connected to the turntable 22.

[0041] Figure 3 It is an assembly schematic diagram of a bottom shell and a turntable provided by an embodiment of the present application. As Figure 3As shown in the figure, the bottom shell 21 includes a hemispherical portion 211 that protrudes outward. The outer surface of the hemispherical portion 211 has a plurality of fixing posts 212. The turntable 22 includes a concave spherical bowl portion 221. The spherical bowl portion 221 has a plurality of avoidance holes 221a. The spherical bowl portion 221 covers the outside of the hemispherical portion 211. The plurality of avoidance holes 221a are respectively sleeved outside the plurality of fixing posts 212, and there is a gap between the hole wall of the avoidance hole 221a and the fixing post 212. The inner surface of the spherical bowl portion 221 is in sliding fit with the outer surface of the hemispherical portion 211.

[0042] The fixing cover 23 is located on the side of the spherical bowl portion 221 away from the hemispherical portion 211. The fixing cover 23 is connected to the plurality of fixing posts 212 to limit the movement of the turntable 22 in the direction away from the hemispherical portion 211.

[0043] By covering the concave spherical bowl portion 221 of the turntable 22 outside the convex hemispherical portion 211 of the bottom shell 21, and the spherical bowl portion 221 is in sliding fit with the hemispherical portion 211, the turntable 22 can rotate relative to the bottom shell 21 in any direction. By providing a plurality of avoidance holes 221a in the spherical bowl portion 221 and a plurality of fixing posts 212 on the outer surface of the hemispherical portion 211, the plurality of fixing posts 212 are respectively located in the plurality of avoidance holes 221a, and there is a gap between the hole wall of the avoidance hole 221a and the outer side wall of the fixing post 212, so that the turntable 22 can rotate relative to the bottom shell 21 within a certain range without being restricted by the fixing posts 212. By providing a fixing cover 23 on the side of the spherical bowl portion 221 away from the hemispherical portion 211 and connecting the fixing cover 23 to the plurality of fixing posts 212, the spherical bowl portion 221 is restricted between the hemispherical portion 211 and the fixing cover 23, preventing the spherical bowl portion 221 from separating from the hemispherical portion 211. The detector main body 10 of the smoke detector can be installed on the turntable 22, so that the detector main body 10 can rotate relative to the bottom shell 21 with the turntable 22 in any direction, facilitating the adjustment of the smoke detector.

[0044] In the embodiment of the present application, the outer surface of the hemispherical portion 211 may include a part of the spherical surface, such as a spherical crown surface. The height of the spherical crown surface may be less than the radius of the spherical surface or equal to the radius of the spherical surface. When the height of the spherical crown surface is equal to the radius of the spherical surface, the spherical crown surface is a hemispherical surface. The bottom of the spherical crown surface is a circle. The inner surface of the spherical bowl portion 221 is in sliding fit with the outer surface of the hemispherical portion 211, so that the turntable 22 can rotate relative to the bottom shell 21. Here, the rotation may include rotation around two mutually perpendicular diameters of the bottom of the spherical crown surface and also rotation around the height of the spherical crown surface.

[0045] Figure 4 It is a schematic diagram of the internal structure of an adjustable cloud platform base provided by an embodiment of the present application. As Figure 4 shown, the outer surface of the spherical bowl portion 221 is a hemispherical convex surface, and the fixing cover 23 is attached to the outer surface of the spherical bowl portion 221.

[0046] By setting the outer surface of the ball bowl portion 221 as a hemispherical convex surface and fitting the fixed cover 23 onto the outer surface of the ball bowl portion 221, during the process of rotating the turntable 22, the ball bowl portion 221 slides on the surface of the fixed cover 23. The concave surface of the fixed cover 23 close to the ball bowl portion 221 and the outer surface of the hemispherical portion 211 jointly restrict the ball bowl portion 221, preventing the ball bowl portion 221 from moving away from the hemispherical portion 211 without affecting the rotation of the ball bowl portion 221.

[0047] As Figure 4 shown, the bottom shell 21 further includes a first cylindrical portion 213. The first cylindrical portion 213 is sleeved outside the hemispherical portion 211, and one end of the first cylindrical portion 213 is connected to the hemispherical portion 211. The turntable 22 further includes a second cylindrical portion 222. The second cylindrical portion 222 is sleeved outside the ball bowl portion 221, and one end of the second cylindrical portion 222 is connected to the ball bowl portion 221. One ends of the ball bowl portion 221 and the second cylindrical portion 222 are both located in the first cylindrical portion 213, and there is a gap between the second cylindrical portion 222 and the first cylindrical portion 213.

[0048] The first cylindrical portion 213 surrounds the hemispherical portion 211, the ball bowl portion 221, and the second cylindrical portion 222, which can provide protection for the turntable 22. The arrangement of the first cylindrical portion 213 and the second cylindrical portion 222 can also prevent foreign objects from entering between the outer surface of the hemispherical portion 211 and the inner surface of the ball bowl portion 221, so as to avoid affecting the rotation of the turntable 22. The gap between the first cylindrical portion 213 and the second cylindrical portion 222 enables the rotation of the turntable 22 not to be affected by the first cylindrical portion 213.

[0049] As Figure 4 shown, the turntable 22 further includes a third cylindrical portion 223. The third cylindrical portion 223 is sleeved outside the second cylindrical portion 222. One end of the second cylindrical portion 222 is connected to the ball bowl portion 221, and the third cylindrical portion 223 is connected to the other end of the second cylindrical portion 222. The third cylindrical portion 223 is located outside the first cylindrical portion 213 and has a gap with the first cylindrical portion 213.

[0050] By providing the third cylindrical portion 223 connected to the second cylindrical portion 222 outside the first cylindrical portion 213, the gap between the third cylindrical portion 223 and the first cylindrical portion 213 communicates with the gap between the second cylindrical portion 222 and the first cylindrical portion 213, making it more difficult for foreign objects from the outside to enter between the outer surface of the hemispherical portion 211 and the inner surface of the ball bowl portion 221 through the gap between the turntable 22 and the bottom shell 21, further avoiding affecting the rotation of the turntable 22. The gap between the first cylindrical portion 213 and the third cylindrical portion 223 enables the rotation of the turntable 22 not to be affected by the third cylindrical portion 223.

[0051] The gap sizes between the first cylindrical portion 213 and the second cylindrical portion 222, and between the first cylindrical portion 213 and the third cylindrical portion 223 can both be set according to the rotation range of the turntable 22. The larger the rotation range, the larger the gap is set; the smaller the rotation range, the smaller the gap is set.

[0052] Exemplarily, the turntable 22 can rotate 16° around any diameter at the bottom of the spherical crown surface. That is, with the state where the height of the inner surface of the spherical bowl portion 221 coincides with the height of the outer surface of the hemispherical portion 211 as a reference, the turntable 22 can rotate up to 8° in any direction around any diameter at the bottom of the spherical crown surface.

[0053] Figure 5 is a schematic structural diagram of a turntable provided by an embodiment of the present application. As Figure 5 shown, at one end where the second cylindrical portion 222 is connected to the spherical bowl portion 221, there are two limiting protrusions 224, and the two limiting protrusions 224 are arranged at intervals along the circumferential direction of the second cylindrical portion 222.

[0054] Referring to Figure 3 , the bottom shell 21 further includes a limiting portion 214. The limiting portion 214 is located in the first cylindrical portion 213 and is between the hemispherical portion 211 and the first cylindrical portion 213. The limiting portion 214 is between the two limiting protrusions 224 and has a gap with at least one of the limiting protrusions 224.

[0055] The two limiting protrusions 224 can limit the limiting portion 214. During the process of the turntable 22 rotating around the height of the spherical crown surface, the two limiting protrusions 224 move relative to the limiting portion 214 along with the turntable 22, which is equivalent to the limiting portion 214 moving between the two limiting protrusions 224 relative to the turntable 22. When the turntable 22 rotates in one direction until the limiting portion 214 contacts one of the limiting protrusions 224, the rotation of the turntable 22 in this direction reaches the maximum angle, so as to limit the rotation range of the turntable 22 around the height of the spherical crown surface.

[0056] By changing the distance between the two limiting protrusions 224, the rotation range of the turntable 22 around the height of the spherical crown surface can be changed. As an example, the maximum angle of the turntable 22 rotating around the height of the spherical crown surface can be 2°. That is, starting from the contact between the limiting portion 214 and any one of the limiting protrusions 224, rotate the turntable 22 around the height of the spherical crown surface until the limiting portion 214 contacts the other limiting protrusion 224, and the angle through which the turntable 22 rotates is 2°.

[0057] As Figure 4As shown, the middle part of the hemispherical portion 211 has a first through hole 211a, the middle part of the spherical bowl portion 221 has a second through hole 221b, and the second through hole 221b communicates with the first through hole 211a. The middle part of the fixed cover 23 has a third through hole 23a, and the third through hole 23a communicates with the second through hole 221b. The first through hole 211a, the second through hole 221b, and the third through hole 23a are used for arranging wiring harnesses.

[0058] The turntable 22 can be used to install the detector body 10, and the detector body 10 needs to be connected with wiring harnesses, such as power supply wires for power supply and signal wires for transmitting signals. By providing the communicating first through hole 211a, second through hole 221b, and third through hole 23a, the wiring harnesses can pass through the bottom shell 21, the turntable 22, and the fixed cover 23 normally.

[0059] As Figure 4 shown, an annular sealing ring 2211 is fixed on the inner surface of the spherical bowl portion 221, and the annular sealing ring 2211 abuts against the outer surface of the hemispherical portion 211 to form a seal. The annular sealing ring 2211 surrounds the first through hole 211a, the second through hole 221b, and the third through hole 23a.

[0060] Arranging the annular sealing ring 2211 surrounding the first through hole 211a, the second through hole 221b, and the third through hole 23a can seal the gap between the outer surface of the hemispherical portion 211 and the inner surface of the spherical bowl portion 221, thereby preventing external water from entering the first through hole 211a, the second through hole 221b, and the third through hole 23a through the gap between the outer surface of the hemispherical portion 211 and the inner surface of the spherical bowl portion 221.

[0061] Exemplarily, the annular sealing ring 2211 can be a silicone ring or a rubber ring.

[0062] The annular sealing ring 2211 has elasticity and can also generate damping when abutting against the outer surface of the hemispherical portion 211, so that after the turntable 22 is adjusted, the turntable 22 can remain relatively stationary with respect to the bottom shell 21 under the damping action of the annular sealing ring 2211.

[0063] In some examples, the annular sealing ring 2211 and the turntable 22 can be secondary injection molded parts.

[0064] That is, the annular sealing ring 2211 and the turntable 22 are made by the secondary injection molding process. For example, a material is injected into the mold, and after the turntable 22 is formed, another material is injected again to form the annular sealing ring 2211 on the inner surface of the spherical bowl portion 221, and finally the mold is opened to take out the turntable 22 and the annular sealing ring 2211.

[0065] The production is carried out by using the two-shot injection molding process, which can make the connection between the annular sealing ring 2211 and the spherical bowl part 221 closer, preventing the annular sealing ring 2211 from detaching from the spherical bowl part 221 during the rotation of the turntable 22.

[0066] In some examples, the adjustable pan-tilt base may further include a waterproof connector 27, and the waterproof connector 27 can be inserted into the first through hole 211a. There is a channel in the waterproof connector 27, and the wire harness can pass through the channel of the waterproof connector 27 to further improve the waterproof performance.

[0067] As Figure 4 shown, there is an annular gap 21a between the edge of the inner surface of the spherical bowl part 221 and the outer surface of the hemispherical part 211. The adjustable pan-tilt base further includes a locking ring 24, and the locking ring 24 is sleeved outside the hemispherical part 211. The locking ring 24 can move in a direction away from the hemispherical part 211 into the annular gap 21a to lock the turntable 22.

[0068] After the turntable 22 is adjusted in place, by moving the locking ring 24, the locking ring 24 enters the annular gap 21a, squeezing the inner surface of the spherical bowl part 221, thereby locking the turntable 22 and preventing the turntable 22 from rotating due to external environmental factors. For example, it can prevent the turntable 22 from rotating caused by the vibration of the wall.

[0069] As Figure 4 shown, the inner surface and the outer surface of the locking ring 24 can be spherical zone surfaces. The inner surface of the locking ring 24 can fit with the outer surface of the hemispherical part 211, and one end of the locking ring 24 close to the spherical bowl part 221 can be located in the annular gap 21a. The outer surface of the locking ring 24 can fit or have a clearance fit with the edge of the inner surface of the spherical bowl part 221. During the process of moving the locking ring 24 in a direction away from the hemispherical part 211, the locking ring 24 further moves into the annular gap 21a and squeezes against the edge of the inner surface of the spherical bowl part 221.

[0070] Referring to Figure 2 shown, one side of the locking ring 24 away from the spherical bowl part 221 has a plurality of grooves 24a, and the plurality of grooves 24a are circumferentially spaced apart along the locking ring 24.

[0071] The adjustable pan-tilt base further includes a pushing ring 25, and the pushing ring 25 is sleeved outside the hemispherical part 211. The pushing ring 25 is located on the side of the locking ring 24 away from the spherical bowl part 221 and can rotate relative to the locking ring 24. One side of the pushing ring 25 close to the locking ring 24 has a plurality of wedge-shaped protrusions 251, and the plurality of wedge-shaped protrusions 251 are respectively located in the plurality of grooves 24a. The wedge-shaped protrusions 251 are used to move out of the grooves 24a as the pushing ring 25 moves, so as to push the locking ring 24 towards the annular gap 21a.

[0072] When the wedge-shaped protrusion 251 is located in the groove 24a, the inner surface of the locking ring 24 can be fitted with the outer surface of the hemispherical portion 211. During the process that the wedge-shaped protrusion 251 gradually moves out of the groove 24a as the pushing ring 25 rotates, the wedge-shaped protrusion 251 contacts the edge of the groove 24a and pushes the locking ring 24 away from the hemispherical portion 211, causing the locking ring 24 to gradually move towards the annular gap 21a and gradually squeezing the edge of the inner surface of the spherical bowl portion 221. When the wedge-shaped protrusion 251 completely moves out of the groove 24a, the squeezing effect of the locking ring 24 on the spherical bowl portion 221 reaches the maximum, and the turntable 22 is locked. Rotating the pushing ring 25 in the reverse direction to make the wedge-shaped protrusion 251 return to the groove 24a can unlock the turntable 22.

[0073] One side wall of the wedge-shaped protrusion 251 is an inclined surface, and one side wall of the groove 24a can also be an inclined surface. When the wedge-shaped protrusion 251 is located in the groove 24a, the inclined surface of the wedge-shaped protrusion 251 is opposite to the inclined surface of the groove 24a; during the process that the wedge-shaped protrusion 251 moves out of the groove 24a, the inclined surface of the wedge-shaped protrusion 251 slides along the inclined surface of the groove 24a. Through the cooperation between the two inclined surfaces, it is convenient for the wedge-shaped protrusion 251 to gradually move out of the groove 24a, so that the squeezing effect of the locking ring 24 on the spherical bowl portion 221 can gradually increase.

[0074] Refer to Figure 2 As shown, a plurality of ear plates 241 can be connected to the outside of the locking ring 24. The ear plates 241 have limiting through holes. A limiting post can also be arranged in the bottom shell 21. The limiting post can be located between the hemispherical portion 211 and the first cylindrical portion 213. The limiting through holes of the ear plates 241 are sleeved outside the limiting post, and the limiting through holes and the limiting post are in clearance fit, so that the ear plates 241 can move along the limiting post. The cooperation between the plurality of ear plates 241 and the plurality of limiting posts enables the locking ring 24 to move in the direction away from or close to the hemispherical portion 211.

[0075] As Figure 2 As shown, the adjustable pan-tilt base can further include an adjusting member 26. The adjusting member 26 can be located outside the first cylindrical portion 213. The first cylindrical portion 213 can have a sliding groove. A part of the adjusting member 26 passes through the sliding groove and is connected to the pushing ring 25. The adjusting member 26 is in sliding fit with the sliding groove and can rotate circumferentially along the first cylindrical portion 213. Thus, by rotating the adjusting member 26, the pushing ring 25 can be driven to lock or unlock the turntable 22.

[0076] The foregoing embodiments are only used to illustrate the technical solutions of the present application, rather than limiting it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included within the protection scope of the present application.

Claims

1. An adjustable pan-tilt base for a smoke detector, characterized in that, It includes a bottom shell (21), a turntable (22) and a fixed cover (23); the bottom shell (21) includes a convex hemispherical part (211), and the outer surface of the hemispherical part (211) has a plurality of fixing posts (212); the turntable (22) includes a concave spherical bowl part (221), the spherical bowl part (221) has a plurality of avoidance holes (221a), the spherical bowl part (221) covers the outside of the hemispherical part (211), the plurality of avoidance holes (221a) are respectively sleeved outside the plurality of fixing posts (212), and there is a gap between the hole wall of the avoidance hole (221a) and the fixing post (212), and the inner surface of the spherical bowl part (221) is in sliding fit with the outer surface of the hemispherical part (211); the fixed cover (23) is located on the side of the spherical bowl part (221) away from the hemispherical part (211) and is connected to the plurality of fixing posts (212) to limit the movement of the turntable (22) in the direction away from the hemispherical part (211).

2. The adjustable pan-tilt base according to claim 1, wherein, The outer surface of the spherical bowl part (221) is a hemispherical convex surface, and the fixed cover (23) is attached to the outer surface of the spherical bowl part (221).

3. The adjustable pan-tilt base according to claim 1, characterized in that, The bottom shell (21) further includes a first cylindrical part (213), the first cylindrical part (213) is sleeved outside the hemispherical part (211), and one end of the first cylindrical part (213) is connected to the hemispherical part (211); The turntable (22) further includes a second cylindrical part (222), the second cylindrical part (222) is sleeved outside the spherical bowl part (221), and one end of the second cylindrical part (222) is connected to the spherical bowl part (221), one ends of the spherical bowl part (221) and the second cylindrical part (222) are both located in the first cylindrical part (213), and there is a gap between the second cylindrical part (222) and the first cylindrical part (213).

4. The adjustable pan-tilt base according to claim 3, wherein The turntable (22) further includes a third cylindrical part (223), the third cylindrical part (223) is sleeved outside the second cylindrical part (222) and is connected to the other end of the second cylindrical part (222), the third cylindrical part (223) is located outside the first cylindrical part (213), and there is a gap between the third cylindrical part (223) and the first cylindrical part (213).

5. The adjustable pan-tilt base according to claim 3, wherein One end of the second cylindrical part (222) connected to the spherical bowl part (221) has two limit protrusions (224), and the two limit protrusions (224) are arranged at intervals along the circumferential direction of the second cylindrical part (222); The bottom shell (21) further includes a limit part (214), the limit part (214) is located in the first cylindrical part (213) and is located between the hemispherical part (211) and the first cylindrical part (213); The limit part (214) is located between the two limit protrusions (224) and has a gap with at least one of the limit protrusions (224).

6. The adjustable pan-tilt base according to any one of claims 1 to 5, characterized in that, The middle part of the hemispherical portion (211) has a first through hole (211a), the middle part of the spherical bowl portion (221) has a second through hole (221b), the second through hole (221b) communicates with the first through hole (211a), the middle part of the fixed cover (23) has a third through hole (23a), the third through hole (23a) communicates with the second through hole (221b), and the first through hole (211a), the second through hole (221b) and the third through hole (23a) are used for arranging wire harnesses; An annular sealing ring (2211) is fixed on the inner surface of the spherical bowl portion (221), the annular sealing ring (2211) abuts against the outer surface of the hemispherical portion (211) to form a seal, and the annular sealing ring (2211) surrounds the first through hole (211a), the second through hole (221b) and the third through hole (23a).

7. The adjustable pan-tilt base according to claim 6, wherein, The annular sealing ring (2211) and the turntable (22) are secondary injection molded parts.

8. The adjustable pan-tilt base according to any one of claims 1 to 5, characterized in that, There is an annular gap (21a) between the edge of the inner surface of the spherical bowl portion (221) and the outer surface of the hemispherical portion (211); The adjustable pan-tilt base further includes a locking ring (24), the locking ring (24) is sleeved outside the hemispherical portion (211), and can move along the direction away from the hemispherical portion (211) into the annular gap (21a) to lock the turntable (22).

9. The adjustable pan-tilt base according to claim 8, wherein One side of the locking ring (24) away from the spherical bowl portion (221) has a plurality of grooves (24a), and the plurality of grooves (24a) are circumferentially spaced along the locking ring (24); The adjustable pan-tilt base further includes a pushing ring (25), the pushing ring (25) is sleeved outside the hemispherical portion (211), the pushing ring (25) is located on the side of the locking ring (24) away from the spherical bowl portion (221), and can rotate relative to the locking ring (24); a plurality of wedge-shaped protrusions (251) are provided on the side of the pushing ring (25) close to the locking ring (24), the plurality of wedge-shaped protrusions (251) are respectively located in the plurality of grooves (24a), and the wedge-shaped protrusions (251) are used to move out of the grooves (24a) along with the pushing ring (25) to push the locking ring (24) to move towards the annular gap (21a).

10. A smoke detector, characterized in that, It includes a detector main body (10) and an adjustable pan-tilt base (20) according to any one of claims 1 to 9, and the detector main body (10) is connected to the turntable (22).

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