Intelligent water meter with wireless communication function

Abstract

The application discloses a kind of intelligent water meters with wireless communication function, belong to water meter technical field, including water meter main body and the power supply compartment being set in water meter main body, the upper surface of the inner wall of power supply compartment is fixedly connected with rubber air ring;Two gas injection components are fixedly installed on the upper surface of the inner wall of power supply compartment, and the gas injection component is communicated with rubber air ring;The application can push the storage tank to be housed in power supply compartment after replacing battery, by pressing knob head, air in gas injection component is injected into rubber air ring to make it expand to strengthen the sealing of the opening of power supply compartment, improve waterproof effect, at the same time, after the threaded connection of knob head and power supply compartment, by pulling the sliding block pull handle and loosening, the limiting rod is inserted into the positioning hole of knob head under the elastic action of spring, realize the stable structure that storage tank, power supply compartment and knob head are fixed as a whole, reduce the step of replacing battery, and also guarantee waterproof effect, convenient to operate, more efficient.

Description

Technical Field

[0001] This invention relates to the field of water meter technology, and in particular to a smart water meter with wireless communication function. Background Technology

[0002] A smart water meter is a new type of water meter that uses modern microelectronics, modern sensing technology, and smart IC card technology to measure water consumption, transmit water usage data, and settle transactions. It represents a significant advancement compared to traditional water meters, which typically only have the functions of flow rate collection and mechanical pointer display of water consumption.

[0003] In practical use, existing smart water meters require a separate power supply. When replacing the power supply, it is necessary to use tools such as screwdrivers to open the battery compartment of the smart water meter and remove the battery for replacement. After replacing the battery, the sealing ring and the outer cover need to be installed in sequence. During this process, waterproof grease needs to be applied to the sealing ring to ensure its waterproofness against the battery. The replacement process is cumbersome, time-consuming, and labor-intensive, resulting in a lack of work efficiency.

[0004] To address the aforementioned problems, this invention proposes a smart water meter with wireless communication capabilities. Summary of the Invention

[0005] This invention provides a smart water meter with wireless communication function, which solves the problems mentioned above.

[0006] This invention provides the following technical solution:

[0007] A smart water meter with wireless communication function includes:

[0008] The water meter body and the power supply compartment inside the water meter body are provided, and a rubber air ring is fixedly connected to the upper surface of the inner wall of the power supply compartment.

[0009] Two air injection components are fixedly installed on the upper surface of the inner wall of the power compartment. The air injection components are connected to the rubber air ring, and a knob head is fixedly installed on the top of the air injection components. The outer wall of the knob head is provided with a positioning hole.

[0010] The mounting assembly is located inside the power supply compartment. The mounting assembly includes a storage tank that can slide up and down. The storage tank is located inside a rubber gasket and has an opening. A top cover is fixedly connected to the top of the storage tank, and two guide grooves are provided on the upper surface of the top cover.

[0011] Two positioning components are respectively set in two guide grooves to limit the movement of the knob head.

[0012] In one possible design, the air injection assembly includes an air guide canister fixedly connected to the upper surface of the inner wall of the power supply compartment, with the bottom end of the air guide canister connected to a rubber gas ring via a conduit. A push rod is slidably engaged at the top end of the air guide canister, with the top end of the push rod fixedly connected to a knob head. A push block is movably connected to the bottom end of the push rod inside the air guide canister via a bushing. The outer wall of the push block is covered with a rubber layer, and the outer wall of the push block is in contact with the inner wall of the air guide canister.

[0013] In one possible design, the mounting assembly includes a slider handle that slides into a guide groove. A limit rod is fixedly connected to the front end of the slider handle, and the front end of the limit rod penetrates the inner wall of the guide groove for sliding engagement with a positioning hole to secure and limit the knob head. A spring is fixedly connected between the tail end of the slider handle and the inner wall of the spring. The length of the slider handle is greater than the depth of the guide groove.

[0014] In one possible design, a handle is fixedly connected to the top center of both the knob head and the top center of the top cover, and two threaded holes are opened on the upper surface of the power compartment, with the bottom end of the knob head threadedly connected to the threaded hole on the upper surface of the power compartment.

[0015] In one possible design, two guide rods are fixedly connected inside the power compartment, and the guide rods are located on both sides of the storage tank. Two sliding sleeves that are slidably fitted onto the guide rods are fixedly connected to the outer wall of the storage tank.

[0016] In one possible design, the opening of the storage tank is provided with an arc-shaped side cover that engages with it. The arc-shaped side cover is connected to the storage tank in a hollow cylindrical structure. The bottom end of the arc-shaped side cover is fixedly connected to the lower surface of the inner wall of the power supply compartment. Several heat-conducting fins are fixedly connected to the lower surface of the arc-shaped side cover.

[0017] In one possible design, a Bluetooth module is installed inside the water meter body, a humidity sensor with a probe extending into the power supply compartment is fixedly installed on the outer wall of the power supply compartment, and the humidity sensor is connected to the Bluetooth module via a wire, and a dial is provided on the water meter body.

[0018] In one possible design, the top of the storage tank opening is provided with a groove, and the top of the arc-shaped side cover is fixedly connected with a piece, one end of which is engaged in the groove, and both the groove and the piece are arc-shaped structures.

[0019] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit the invention.

[0020] In this invention, a separate storage tank is provided inside the power compartment, which can be pulled out, making it convenient to remove and replace the battery. A separate rubber gasket is provided at the opening of the power compartment and is connected to the air injection component. After the storage tank is pushed into the power compartment for battery replacement, air from the air injection component is injected into the rubber gasket by pressing down the knob head, causing it to expand and strengthen the seal of the opening of the power compartment, improving the waterproof effect. At the same time, after the knob head is threadedly fixed to the power compartment, pulling the slider handle and releasing it allows the limit rod to be inserted into the positioning hole of the knob head under the elastic action of the spring, realizing a stable structure in which the storage tank, power compartment and knob head are fixed together. This reduces the number of steps for battery replacement while ensuring the waterproof effect, making it convenient to use and more efficient.

[0021] In this invention, an arc-shaped side cover is fixedly connected inside the power compartment. When the storage tank is lowered and housed in the power compartment, it can stably fit against the opening of the side cover, forming a whole to wrap the battery. Together with the power compartment, it can provide good protection for the battery. At the same time, several heat-conducting plates are provided at the bottom of the arc-shaped side cover and connected to it. When the water meter body is installed on the pipe, it can be connected to the pipe at the same time. This allows the heat-conducting plates to contact the water flow to reduce the temperature inside the arc-shaped side cover, prevent the battery from overheating during use, and improve safety.

[0022] In this invention, by setting a humidity sensor at one end of the power supply compartment and extending its probe into the power supply compartment, the humidity sensor can sense the moisture content of the power supply compartment. When the moisture is excessive, it can wirelessly transmit information remotely via Bluetooth module, making it easy to monitor the moisture in the power supply compartment at any time and take timely measures to prevent damage to the battery and internal components of the water meter from moisture. Attached Figure Description

[0023] Figure 1 A three-dimensional structural diagram of a smart water meter with wireless communication function provided in an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the connection structure between the power supply compartment and the storage tank of a smart water meter with wireless communication function provided in an embodiment of the present invention;

[0025] Figure 3 A schematic diagram of the internal structure of the power supply compartment of a smart water meter with wireless communication function provided in an embodiment of the present invention.

[0026] Figure 4 A schematic diagram of the internal structure of the air injection component of a smart water meter with wireless communication function provided in an embodiment of the present invention;

[0027] Figure 5A three-dimensional structural diagram of the top cover of a smart water meter with wireless communication function provided in an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the connection structure between the storage tank and the arc-shaped side cover of a smart water meter with wireless communication function provided in an embodiment of the present invention.

[0029] Figure label:

[0030] 1. Water meter body; 2. Power supply compartment; 3. Dial; 4. Storage tank; 5. Top cover; 6. Rubber air ring; 7. Air canister; 8. Knob head; 9. Positioning hole; 10. Guide groove; 11. Limiting rod; 12. Spring; 13. Sliding handle; 14. Push rod; 15. Bushing; 16. Push block; 17. Arc-shaped side cover; 18. Guide rod; 19. Sliding sleeve; 20. Humidity sensor; 21. Bluetooth module; 22. Heat-conducting plate; 23. Insert; 24. Groove. Detailed Implementation

[0031] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0032] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] Example 1

[0034] Reference Figure 1-5 This embodiment of a smart water meter with wireless communication function includes:

[0035] The water meter body 1 and the power supply compartment 2 are set inside the water meter body 1. A rubber air ring 6 is fixedly connected to the upper surface of the inner wall of the power supply compartment 2.

[0036] Two air injection components are fixedly installed on the upper surface of the inner wall of the power compartment 2. The air injection components are connected to the rubber air ring 6, and a knob head 8 is fixedly installed on the top of the air injection components. A positioning hole 9 is opened on the outer wall of the knob head 8.

[0037] The mounting assembly is located inside the power compartment 2. The mounting assembly includes a storage tank 4 that can slide up and down. The storage tank 4 is located inside the rubber air ring 6 and has an opening. A top cover 5 is fixedly connected to the top of the storage tank 4. Two guide grooves 10 are provided on the upper surface of the top cover 5.

[0038] Two positioning components are respectively set in two guide grooves 10 to limit the knob head 8.

[0039] Specifically, such as Figure 3 and Figure 4 As shown, the air injection assembly includes an air canister 7 fixedly connected to the upper surface of the inner wall of the power compartment 2. The bottom end of the air canister 7 is connected to the rubber air ring 6 through a conduit. The top end of the air canister 7 is slidably engaged with a push rod 14. The top end of the push rod 14 is fixedly connected to a knob head 8. The bottom end of the push rod 14 inside the air canister 7 is movably connected to a push block 16 through a bushing 15. The outer wall of the push block 16 is covered with a rubber layer, and the outer wall of the push block 16 is in contact with the inner wall of the air canister 7. By pressing the knob head 8, the push rod 14 can simultaneously drive the push block 16 downward to compress the air in the air canister 7, allowing it to be injected into the rubber air ring 6 through the conduit. The connection through the bushing 15 allows the knob head 8 to rotate independently, facilitating the connection of the knob head 8 to the power compartment 2. After the threaded connection between the knob head 8 and the power compartment 2 is released, the expanded rubber air ring 6 can cause the gas to flow back into the air canister 7, thereby pushing the knob head 8 to automatically lift.

[0040] Specifically, such as Figure 2 and Figure 5 As shown, the installation assembly includes a slider handle 13 that slides into the guide groove 10. A limiting rod 11 is fixedly connected to the front end of the slider handle 13, and the front end of the limiting rod 11 penetrates the inner wall of the guide groove 10. It is used to slide into the positioning hole 9 to fasten and limit the knob head 8. A spring 12 is fixedly connected between the tail end of the slider handle 13 and the inner wall surface of the spring 12. The length of the slider handle 13 is greater than the depth of the guide groove 10. By pulling the slider handle 13, the limiting rod 11 is brought into the guide groove 10, which makes it easy to pull up the top cover 5 to pull out the storage tank 4, making it easy to replace the battery inside. Under the connection of the spring 12, the limiting rod 11 can elastically extend and retract and automatically insert into the positioning hole 9.

[0041] A handle is fixedly connected to the top center of the knob head 8 and the top center of the top cover 5. Two threaded holes are opened on the upper surface of the power compartment 2. The bottom end of the knob head 8 is threaded into the threaded hole on the upper surface of the power compartment 2. This design makes it convenient to rotate the knob head 8 and the top cover 5, making the operation more user-friendly.

[0042] Specifically, such as Figure 2 As shown, two guide rods 18 are fixedly connected inside the power compartment 2, and the guide rods 18 are located on both sides of the storage tank 4. Two sliding sleeves 19 are fixedly connected to the outer wall of the storage tank 4 and are slidably sleeved on the guide rods 18. Through the connection and cooperation of the guide rods 18 and the sliding sleeves 19, the storage tank 4 can be limited and guided, so that the storage tank 4 can maintain good stability when it is raised and lowered.

[0043] An arc-shaped side cover 17 is provided at the opening of the storage tank 4 and engages with it. The arc-shaped side cover 17 is connected to the storage tank 4 in a hollow cylindrical structure. The bottom end of the arc-shaped side cover 17 is fixedly connected to the lower surface of the inner wall of the power compartment 2. Several heat-conducting plates 22 are fixedly connected to the lower surface of the arc-shaped side cover 17. The heat-conducting plates 22 can be connected to the water pipe along with the bottom end of the water meter body 1, so that the interior of the arc-shaped side cover 17 can be cooled by contacting the heat-conducting plates 22 with cool water, which can prevent the battery installed in the storage tank 4 from being damaged due to excessive temperature and improve safety performance.

[0044] Specifically, such as Figure 1 and Figure 3 As shown, a Bluetooth module 21 is installed inside the water meter body 1, and a humidity sensor 20 with a probe extending into the power supply compartment 2 is fixedly installed on the outer wall of the power supply compartment 2. The humidity sensor 20 is connected to the Bluetooth module 21 through a wire, and a dial 3 is provided on the water meter body 1.

[0045] Example 2

[0046] Reference Figure 1-6 This embodiment of a smart water meter with wireless communication function includes:

[0047] The water meter body 1 and the power supply compartment 2 are set inside the water meter body 1. A rubber air ring 6 is fixedly connected to the upper surface of the inner wall of the power supply compartment 2.

[0048] Two air injection components are fixedly installed on the upper surface of the inner wall of the power compartment 2. The air injection components are connected to the rubber air ring 6, and a knob head 8 is fixedly installed on the top of the air injection components. A positioning hole 9 is opened on the outer wall of the knob head 8.

[0049] The mounting assembly is located inside the power compartment 2. The mounting assembly includes a storage tank 4 that can slide up and down. The storage tank 4 is located inside the rubber air ring 6 and has an opening. A top cover 5 is fixedly connected to the top of the storage tank 4. Two guide grooves 10 are provided on the upper surface of the top cover 5.

[0050] Two positioning components are respectively set in two guide grooves 10 to limit the knob head 8.

[0051] Specifically, such as Figure 3 and Figure 4As shown, the air injection assembly includes an air canister 7 fixedly connected to the upper surface of the inner wall of the power compartment 2. The bottom end of the air canister 7 is connected to the rubber air ring 6 through a conduit. The top end of the air canister 7 is slidably engaged with a push rod 14. The top end of the push rod 14 is fixedly connected to a knob head 8. The bottom end of the push rod 14 inside the air canister 7 is movably connected to a push block 16 through a bushing 15. The outer wall of the push block 16 is covered with a rubber layer, and the outer wall of the push block 16 is in contact with the inner wall of the air canister 7. By pressing the knob head 8, the push rod 14 can simultaneously drive the push block 16 downward to compress the air in the air canister 7, allowing it to be injected into the rubber air ring 6 through the conduit. The connection through the bushing 15 allows the knob head 8 to rotate independently, facilitating the connection of the knob head 8 to the power compartment 2. After the threaded connection between the knob head 8 and the power compartment 2 is released, the expanded rubber air ring 6 can cause the gas to flow back into the air canister 7, thereby pushing the knob head 8 to automatically lift.

[0052] Specifically, such as Figure 2 and Figure 5 As shown, the installation assembly includes a slider handle 13 that slides into the guide groove 10. A limiting rod 11 is fixedly connected to the front end of the slider handle 13, and the front end of the limiting rod 11 penetrates the inner wall of the guide groove 10. It is used to slide into the positioning hole 9 to fasten and limit the knob head 8. A spring 12 is fixedly connected between the tail end of the slider handle 13 and the inner wall surface of the spring 12. The length of the slider handle 13 is greater than the depth of the guide groove 10. By pulling the slider handle 13, the limiting rod 11 is brought into the guide groove 10, which makes it easy to pull up the top cover 5 to pull out the storage tank 4, making it easy to replace the battery inside. Under the connection of the spring 12, the limiting rod 11 can elastically extend and retract and automatically insert into the positioning hole 9.

[0053] A handle is fixedly connected to the top center of the knob head 8 and the top center of the top cover 5. Two threaded holes are opened on the upper surface of the power compartment 2. The bottom end of the knob head 8 is threaded into the threaded hole on the upper surface of the power compartment 2. This design makes it convenient to rotate the knob head 8 and the top cover 5, making the operation more user-friendly.

[0054] Specifically, such as Figure 2 As shown, two guide rods 18 are fixedly connected inside the power compartment 2, and the guide rods 18 are located on both sides of the storage tank 4. Two sliding sleeves 19 are fixedly connected to the outer wall of the storage tank 4 and are slidably sleeved on the guide rods 18. Through the connection and cooperation of the guide rods 18 and the sliding sleeves 19, the storage tank 4 can be limited and guided, so that the storage tank 4 can maintain good stability when it is raised and lowered.

[0055] An arc-shaped side cover 17 is provided at the opening of the storage tank 4 and engages with it. The arc-shaped side cover 17 is connected to the storage tank 4 in a hollow cylindrical structure. The bottom end of the arc-shaped side cover 17 is fixedly connected to the lower surface of the inner wall of the power compartment 2. Several heat-conducting plates 22 are fixedly connected to the lower surface of the arc-shaped side cover 17. The heat-conducting plates 22 can be connected to the water pipe along with the bottom end of the water meter body 1, so that the interior of the arc-shaped side cover 17 can be cooled by contacting the heat-conducting plates 22 with cool water, which can prevent the battery installed in the storage tank 4 from being damaged due to excessive temperature and improve safety performance.

[0056] Specifically, such as Figure 1 and Figure 3 As shown, a Bluetooth module 21 is installed inside the water meter body 1, and a humidity sensor 20 with a probe extending into the power supply compartment 2 is fixedly installed on the outer wall of the power supply compartment 2. The humidity sensor 20 is connected to the Bluetooth module 21 through a wire, and a dial 3 is provided on the water meter body 1.

[0057] Specifically, such as Figure 6 As shown, a groove 24 is provided at the top of the opening of the storage tank 4, and a piece 23 is fixedly connected to the top of the arc-shaped side cover 17. One end of the piece 23 is engaged in the groove 24, and both the groove 24 and the piece 23 are arc-shaped. Through this design, when the storage tank 4 is lowered, the arc-shaped side cover 17 can form a relative displacement with it, which facilitates direct contact with the opening of the storage tank 4. Furthermore, through the connection and cooperation of the piece 23 and the groove 24, the arc-shaped side cover 17 can maintain a tight fit with the storage tank 4, providing good protection for the battery.

[0058] Working principle: When in use, the smart water meter is installed on the water pipe. During daily use, the humidity sensor 20 set at one end of the power compartment 2 monitors the moisture in the power compartment 2 in real time and transmits the signal remotely through the Bluetooth module 21. When it is necessary to replace the battery in the power compartment 2, the limit rod 11 is pulled out from the positioning hole 9 on the knob head 8 by pulling back the slider handle 13 in the guide slide 10, releasing the top cover 5 and the knob head 8 from the fixation. Then, the two knob heads 8 are rotated to release the threaded connection with the power compartment 2, allowing the knob heads 8 to rise and the rubber air ring 6 to contract. Then, the storage tank 4 is pulled out from the power compartment 2 by pulling up the top cover 5, and the battery inside is removed for replacement.

[0059] Secondly, after replacing the new battery, the storage tank 4 is pressed down and housed in the power compartment 2. During this process, the storage tank 4 and the arc-shaped side cover 17 fit together to form a complete shell that wraps around the battery. After replacing the new battery, the push block 16 is lowered by pressing down the knob head 8, which compresses the air in the air canister 7 and injects it into the rubber air ring 6, causing the rubber air ring 6 to inflate and expand, thereby strengthening the seal by tightly fitting the opening of the power compartment 2 and the storage tank 4. Then, the knob head 8 is rotated and threadedly connected to the power compartment 2 to a fixed position. By pulling the limit rod 11 and releasing it, the limit rod 11 is inserted into the positioning hole 9 of the knob head 8, locking the knob head 8 and the top cover 5.

[0060] However, as is well known to those skilled in the art, the working principles and wiring methods of the humidity sensor 20 and the Bluetooth module 21 are commonplace and are all conventional methods or common knowledge, so they will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0061] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. In the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A smart water meter with wireless communication function, characterized in that, include: The water meter body (1) and the power supply compartment (2) set inside the water meter body (1) are provided with a rubber air ring (6) fixedly connected to the upper surface of the inner wall of the power supply compartment (2). Two air injection components are fixedly installed on the upper surface of the inner wall of the power supply compartment (2). The air injection components are connected to the rubber air ring (6), and a knob head (8) is fixedly installed on the top of the air injection components. The outer wall of the knob head (8) is provided with a positioning hole (9). The installation component is set in the power compartment (2). The installation component includes a storage tank (4) that can slide up and down. The storage tank (4) is located in the rubber air ring (6) and has an opening. The top of the storage tank (4) is fixedly connected to a top cover (5). The upper surface of the top cover (5) is provided with two guide grooves (10). Two positioning components are respectively set in two guide grooves (10) to limit the knob head (8); The air injection assembly includes an air guide canister (7) fixedly connected to the upper surface of the inner wall of the power supply compartment (2), and the bottom end of the air guide canister (7) is connected to the rubber air ring (6) through a conduit. The top end of the air guide canister (7) is slidably engaged with a push rod (14), the top end of the push rod (14) is fixedly connected to a knob head (8), and the bottom end of the push rod (14) located inside the air guide canister (7) is movably connected to a push block (16) through a bushing (15). The outer wall of the push block (16) is wrapped with a rubber layer, and the outer wall of the push block (16) is in contact with the inner wall of the air guide canister (7).

2. A smart water meter with wireless communication function according to claim 1, characterized in that, The installation assembly includes a slider handle (13) that is slidably engaged in the guide groove (10). The front end of the slider handle (13) is fixedly connected to a limiting rod (11), and the front end of the limiting rod (11) penetrates the inner wall of the guide groove (10) for slidably engaging in the positioning hole (9) to securely limit the knob head (8). The tail end of the slider handle (13) is fixedly connected to the inner wall of the spring (12). The length of the slider handle (13) is greater than the depth of the guide groove (10).

3. A smart water meter with wireless communication function according to claim 2, characterized in that, The top center of the knob head (8) and the top center of the top cover (5) are both fixedly connected to handles. The upper surface of the power compartment (2) has two threaded holes, and the bottom end of the knob head (8) is threadedly connected to the threaded hole on the upper surface of the power compartment (2).

4. A smart water meter with wireless communication function according to claim 1, characterized in that, Two guide rods (18) are fixedly connected inside the power compartment (2), and the guide rods (18) are located on both sides of the storage tank (4). Two sliding sleeves (19) are fixedly connected to the outer wall of the storage tank (4) and are slidably sleeved on the guide rods (18).

5. A smart water meter with wireless communication function according to claim 1, characterized in that, The storage tank (4) has an arc-shaped side cover (17) that engages with it at the opening. The arc-shaped side cover (17) is connected to the storage tank (4) in a hollow cylindrical structure. The bottom of the arc-shaped side cover (17) is fixedly connected to the lower surface of the inner wall of the power supply compartment (2). Several heat-conducting plates (22) are fixedly connected to the lower surface of the arc-shaped side cover (17).

6. A smart water meter with wireless communication function according to claim 1, characterized in that, The water meter body (1) is equipped with a Bluetooth module (21), and a humidity sensor (20) with a probe extending into the power compartment (2) is fixedly installed on the outer wall of the power compartment (2). The humidity sensor (20) is connected to the Bluetooth module (21) through a wire, and a dial (3) is provided on the water meter body (1).

7. A smart water meter with wireless communication function according to claim 5, characterized in that, The top of the opening of the storage tank (4) is provided with a groove (24), and the top of the arc-shaped side cover (17) is fixedly connected with a piece (23). One end of the piece (23) is engaged in the groove (24), and both the groove (24) and the piece (23) are arc-shaped structures.

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