A screw joint and a hidden water tank having the same

Abstract

The utility model relates to a kind of bathroom equipment technical field, especially a kind of screw joint and the hidden water tank with it, wherein screw joint is used to connect corresponding screw, screw joint has screw hole, at least two thread segments are set on screw hole along circumference, alternatively, at least one thread segment and at least one blocking rib segment are set on screw hole along circumference, in the state that one end of screw is engaged with one thread segment, another thread segment or blocking rib segment is used to prevent screw from coming out of screw hole and make room for screw's screwing path.The utility model at least two thread segments / one thread segment and blocking rib segment are set on screw hole along circumference, in the state that one end of screw is engaged with one thread segment, another thread segment or blocking rib segment is used to prevent screw from coming out of screw hole and make room for screw's screwing path, so that the structure can be well adapted to screw of different diameter size;Further through differentiation design, the adaptation range of screw joint is greatly improved.

Description

Technical Field

[0001] This utility model generally relates to the field of bathroom equipment technology, and more specifically, to a screw connector and a concealed water tank having the same. Background Technology

[0002] Concealed water tanks are common water-saving devices in the bathroom industry. Their core installation method is to embed the tank, which integrates flushing components such as drain valve and inlet valve, into the wall and conceal it with a decorative wall. Only the panel component that is linked with the drive component inside the tank is exposed at the window of the decorative wall to realize flushing control. The current mainstream linkage structure is as follows: the drive component has a screw joint near the window end, which is fixedly connected to the linkage screw through threads, buckles, etc.; when the panel button is pressed, the force is transmitted to the screw. Because the screw and the screw joint are rigidly fixed, the drive component can be driven to trigger the drain valve to flush water, relying on the linear transmission of force through the screw. However, different brands and models of panel components require different parameters for their matching screws due to structural differences in button travel, installation dimensions, etc., such as thread specifications and end shapes. Existing water tanks have fixed and standardized screw connector structures, only compatible with specific screws. When users replace the panel, if the new panel screw does not match the original connector (e.g., thread incompatibility), simultaneous installation is impossible, limiting the water tank's compatibility with different panels and causing inconvenience during installation and replacement. This demonstrates a structural compatibility defect.

[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] The present invention includes a series of simplified concepts, which will be further explained in detail in the detailed description section. This present invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0005] One of the main objectives of this utility model is to overcome at least one of the defects of the prior art and to provide a screw connector and a concealed water tank having the same.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: According to one aspect of the present invention, a screw connector is provided for connecting a corresponding screw. The screw connector has a screw hole with at least two threaded segments arranged circumferentially on the screw hole, or at least one threaded segment and at least one retaining rib segment arranged circumferentially on the screw hole. When one end of the screw is engaged with one of the threaded segments, the other threaded segment or retaining rib segment is used to prevent the screw from coming out of the screw hole and to make way for the screw's screwing path.

[0007] According to one embodiment of the present invention, the end of the first thread of the screw is only a half thread structure, which is used to screw the screw into the thread section when the screw is screwed with the thread section.

[0008] According to one embodiment of the present invention, at least two threaded segments are provided on the screw hole, and the thread on the screw forms an effective threaded connection with at least one of the threaded segments. At least one of the threaded segments limits the radial movement stroke of the screw to prevent the first thread of the screw from coming out of the second thread of the threaded segment. Alternatively, the screw hole is provided with at least one threaded section and one retaining rib section, the thread on the screw and the threaded section form an effective threaded connection, and the retaining rib section limits the radial movement stroke of the screw to prevent the first thread of the screw from coming out of the second thread of the threaded section.

[0009] According to one embodiment of the present invention, the shape of the retaining rib section is configured to match the shape of the screw. The retaining rib section limits the radial movement stroke of the screw, preventing the first thread of the screw from disengaging from the second thread of the threaded section, preventing the screw from axially disengaging, and making way for the screw's screwing path.

[0010] According to one embodiment of the present invention, at least two threaded segments are provided along the circumferential direction of the threaded hole, and each threaded segment is designed differently, with different tooth heights, second thread shapes, or pitches on each threaded segment.

[0011] According to one embodiment of the present invention, there is a center distance between the axes of the two threaded segments or the threaded segment and the retaining rib segment. The center distance is greater than or equal to half of the sum of the tooth heights of the two threaded segments or the center distance is greater than or equal to half of the sum of the height of the retaining rib segment and the tooth height of the threaded segment. At this time, the screw joint is engaged with the screw, and the first thread of the screw only partially engages with one of the threaded segments. The remaining part of the first thread is separated from or tangential to the other threaded segment or the retaining rib segment and limits the radial movement stroke of the screw, so that the screw and the screw hole form an anti-disengagement fit structure.

[0012] According to one embodiment of the present invention, when the center distance is equal to half of the sum of the tooth heights of the two threaded segments or the center distance is equal to half of the sum of the height of the retaining rib segment and the tooth height of the threaded segment, the screw joint is engaged with the screw, and the circle containing the major diameter of the screw thread is tangent to the circle containing the minor diameter of the threaded segment in the non-engaged state or the circle containing the major diameter of the screw thread is tangent to a portion of the retaining rib segment.

[0013] According to one embodiment of the present invention, the other end of the screw is engaged with a mounting panel; the screw passes through a limiting guide plate of the mounting panel, and the range of motion of the screw in the up, down, left, and right directions is limited by the limiting guide plate.

[0014] According to one embodiment of the present invention, a flange for limiting the screw is provided around the screw hole, and the rib on the screw is limited between the thread section and the flange or between the retaining rib section and the flange.

[0015] According to another aspect of this disclosure, a concealed water tank is provided, wherein the screw of the panel assembly is connected to the drive assembly inside the water tank via a screw joint as described in any of the above.

[0016] As can be seen from the above technical solution, the advantages and positive effects of this utility model are as follows: 1. The screw connector of this utility model has at least two threaded segments / at least one threaded segment and at least one retaining segment arranged circumferentially in the screw hole. When one end of the screw is engaged with one of the threaded segments, the other threaded segment or retaining segment is used to prevent the screw from coming out of the screw hole and to make way for the screw's screwing path, so that the structure can be well adapted to screws of different diameters. By using at least two threaded segments, and further through the differentiated design between the two threaded segments, such as the difference in thread pitch, thread height or shape, different types of screws can be effectively engaged with the corresponding threaded segments after being screwed in, thereby adapting to more screws with different thread heights, thread pitches, shapes and diameters. There is no need to design a separate connector for a specific screw, which greatly improves the adaptability range of the screw connector.

[0017] 2. This utility model reduces meshing resistance through a non-coaxial layout and a semi-threaded structure, avoids jamming and disengagement, improves assembly efficiency, and screws into the threaded section.

[0018] 3. The thread on the screw forms an effective threaded connection with at least one threaded segment, and at least one other threaded segment limits the radial travel of the screw to prevent the first thread of the screw from disengaging from the second thread of the threaded segment; or, the screw hole is provided with at least one threaded segment and one retaining rib segment, the thread on the screw forms an effective threaded connection with the threaded segment, and the retaining rib segment limits the radial travel of the screw to prevent the first thread of the screw from disengaging from the second thread of the threaded segment; through the cooperation with the other threaded segment, the screw can be better stabilized in the screw hole, and even if the device shakes, the screw will not disengage from the screw hole, making the overall structure more reliable.

[0019] 4. This utility model precisely controls the center distance of the threaded section / stop rib section, and combines the flange and rib to form an anti-detachment structure, taking into account both radial positioning and axial limiting, and ensuring connection stability.

[0020] 5. The baffle section of this utility model not only prevents the screw from coming out but also avoids the screw-in path, reducing interference.

[0021] 6. Applying this utility model to a concealed water tank can solve the problem of poor compatibility of traditional water tank screw connections, reduce assembly and maintenance difficulty, and optimize the user experience. Attached Figure Description

[0022] The various objectives, features, and advantages of this invention will become more apparent from the following detailed description of preferred embodiments in conjunction with the accompanying drawings. The drawings are merely illustrative of the invention and are not necessarily drawn to scale. In the drawings, the same reference numerals always denote the same or similar parts.

[0023] in: Figure 1 This is a schematic diagram of the screw connector structure of some embodiments of this application.

[0024] Figure 2 This is a cross-sectional view of the screw joint and screw connection structure of some embodiments of this application.

[0025] Figure 3 This is a schematic diagram of the screw joint and screw connection structure of some embodiments of this application.

[0026] Figure 4 This is a schematic diagram of the screw connector installation structure according to some embodiments of this application.

[0027] Figure 5 yes Figure 4 Enlarged view of part A in the image.

[0028] Figure 6 yes Figure 4 Enlarged view of part B in the image.

[0029] Figure 7This is a structural diagram of the screw joint installation in a concealed water tank according to some embodiments of this application.

[0030] Figure 8 This is a schematic diagram illustrating the working principle of the screw structure in a concealed water tank according to some embodiments of this application.

[0031] Figure 9 This is a schematic diagram of the screw connector connection structure of some embodiments of this application.

[0032] The reference numerals in the attached figures are explained as follows: 100-Screw connector, 110-Screw hole, 120-Threaded section, 121-First threaded section, 122-Second threaded section, 130-Flange; 140-Rib section; 200-Screw, 210-First thread, 211-Meshing part, 212-Non-Meshing part, 220-Rib; 300-Panel assembly, 310-Mounting panel, 320-Limiting guide plate, 330-Decorative panel, 331-Panel button; 400-Water tank body, 410-Drive assembly, 420-Drive bracket, 430-Drain valve. Detailed Implementation

[0033] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0034] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of the present invention. However, those skilled in the art will recognize that the technical solutions of the present invention can be practiced without one or more of the specific details described, or other methods, components, materials, etc., can be employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring various aspects of the present invention.

[0035] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0036] like Figures 1-2As shown, this embodiment provides a screw connector for connecting a corresponding screw 200. The screw connector 100 has a screw hole 110, with at least two threaded segments 120 arranged circumferentially on the screw hole 110, or at least one threaded segment 120 and at least one retaining rib segment 140 arranged circumferentially on the screw hole 110. When one end of the screw 200 is engaged with one of the threaded segments 120, the other threaded segment 120 or retaining rib segment 140 is used to prevent the screw 200 from disengaging from the screw hole 110 and to allow space for the screw 200 to be screwed in. This structure can be well adapted to screws 200 of different diameters. In this embodiment, the axes of each threaded segment 120 or threaded segment 120 and retaining rib segment 140 are not in the same position. It is understandable that "threaded segment 120" refers to the helical structure on the inner wall of the threaded hole 110 that engages with the first thread 210 of the screw 200, and "retaining rib segment 140" refers to the unthreaded, raised annular structure on the inner wall of the threaded hole 110 that is used for axial positioning. "Insertion path" refers to the path formed by the circumferential and axial movement of the screw 200 when it is screwed into the threaded hole 110 and engages with the threaded segment 120. In this embodiment, after the screw 200 is engaged, the axis of the screw 200 is offset from the central axis of the screw hole 110, achieving eccentric engagement of the screw 200. Different types of screws 200 can engage with the corresponding first thread segment 121 after being screwed into the screw hole 110. They are not interfered with by other second thread segments 122 or retaining segments 140, while being limited by the second thread segments 122 or retaining segments 140 to prevent them from coming out of the screw hole 110. This improves the connection stability and assembly flexibility of the screw joint 100, while overcoming the problems of jamming and stripping of traditional coaxial threads. In this embodiment, the screw hole 110 has two circumferentially evenly distributed first thread segments 121 and second thread segments 122. The fan-shaped included angle formed by a single thread segment 120 on the circumferential surface is less than 90 degrees. In other embodiments, three threaded segments 120 or one threaded segment 120 and two retaining rib segments 140 may be provided. The retaining rib segment 140 may be designed as an arc rather than a complete ring. For example, it may be designed to be the same as one of the threaded segments 120 in this embodiment, but without the shape of a thread. See [reference needed]. Figure 9 As shown.

[0037] In some embodiments, the end of the first thread 210 of the screw 200 is only a half-thread structure, which is used to allow the screw 200 to be screwed into the threaded section 120 when screwed together. It can be understood that "half-thread structure" means that the first thread 210 at the end of the screw 200 retains only half of its thread height or half of its thread length. By reducing the meshing resistance during the initial screwing-in of the screw 200, jamming caused by misalignment of the first thread 210 is avoided, thus reducing assembly difficulty, improving assembly efficiency, and allowing the screw to be screwed into the threaded section 120. In this embodiment, the half-thread structure is located at the screw-in end of the screw 200, and its thread length is only half that of the other first threads 210.

[0038] In some embodiments, such as Figures 1-3 As shown, the screw hole 110 is provided with at least two threaded sections 120. The thread on the screw 200 forms an effective threaded connection with at least one of the threaded sections 120. At least one of the threaded sections 120 limits the radial movement stroke of the screw 200 to prevent the first thread 210 of the screw 200 from disengaging from the second thread of the threaded section 120. Alternatively, the screw hole 110 is provided with at least one threaded section 120 and one retaining section 140. The thread on the screw 200 forms an effective threaded connection with the threaded section 120, and the retaining section 140 limits the radial movement stroke of the screw 200 to prevent the first thread 210 of the screw 200 from disengaging from the second thread of the threaded section 120. It can be understood that "effective threaded connection" means that the first thread 210 of the screw 200 and the thread profile of the threaded section 120 are fully engaged, capable of transmitting axial force and torque, without obvious gaps or stripping. With this design, different types of screws 200 can effectively engage with at least one corresponding threaded segment 120 after being screwed into the screw hole 110, thus connecting the screw 200 to the screw hole 110. In this embodiment, the screw hole 110 is provided with two threaded segments 120. After the screw 200 is screwed into the screw hole 110, it forms an effective connection with one of the threaded segments 120, while the other threaded segment 120 is reserved. The pitch, thread height, etc. of the two threaded segments 120 can be different to better match different types of screws 200. In this embodiment, the other threaded section 120 is also used to limit the radial movement stroke of the screw 200, preventing the first thread 210 of the screw 200 from disengaging from the second thread of the threaded section 120. Since the screw 200 is not engaged with the other threaded section 120, the screw 200 may move radially during use, thereby disengaging from the threaded hole 110. Therefore, the threaded section 120 or the retaining rib section 140 with the other end engaged is used to limit the radial movement stroke, preventing the first thread 210 of the screw 200 from disengaging from the second thread of the threaded section 120 and thus axially disengaging from the threaded hole 110.

[0039] In some embodiments, such as Figure 9As shown, the shape of the retaining rib section 140 is matched with the shape of the screw 200. The retaining rib section 140 limits the radial movement stroke of the screw 200, preventing the first thread 210 of the screw 200 from disengaging from the second thread of the threaded section 120, preventing the screw 200 from axially disengaging, and allowing space for the screw 200 to be screwed in. It can be understood that "shape matching" means that the inner diameter and cross-sectional shape of the retaining rib section 140 are adapted to the outer diameter and cross-sectional profile of the screw 200, neither hindering the rotation of the screw 200 nor obstructing its axial movement; "giving way" means that the retaining rib section 140 avoids the rotation trajectory of the first thread 210 of the screw 200, preventing interference. By combining the dual functions of the retaining rib section 140, it can both limit the axial displacement of the screw 200 to prevent accidental dislodgement and reduce assembly interference. Simultaneously, the retaining rib section 140 can further adapt to the outer circumference shape of the screw 200, guiding the screw 200 to screw in along a preset path, thus improving connection stability. In this embodiment, the screw 200 is cylindrical, and the retaining rib section 140 is designed as a circular ring structure. In other embodiments, if the screw 200 is polygonal or irregularly shaped, the retaining rib section 140 is correspondingly designed as a polygonal or irregularly shaped ring.

[0040] In some embodiments, such as Figures 1-3 As shown, at least two threaded segments 120 are provided circumferentially on the screw hole 110. Each threaded segment 120 has a differentiated design, with different tooth heights, second thread shapes, or pitches. The pitches of the two threaded segments 120 are different. It can be understood that if the pitch (i.e., the pitch of the first thread 210) is the same, after the first thread 210 of the screw 200 engages with the second thread of one of the threaded segments 120, the first thread 210 of the screw 200 will extend into the second thread of the other non-engaging threaded segment 120, causing radial movement. Here, "radial clearance" refers to the gap in the radial direction between the first thread 210 of the screw 200 and the other threaded segment 120. Furthermore, by varying the second thread height of the threaded section 120, the thread pitch between the first threads 210 of the two threaded sections 120, or the shape of the first threads 210, the screws 200 with different first thread heights, pitches, thread shapes, and diameters can be adapted to the actual design differences, thus achieving greater compatibility.

[0041] In some embodiments, such as Figures 1-2As shown, there is a center distance L between the axes of the two threaded segments 120 or the threaded segment 120 and the retaining rib segment 140. L is at least not equal to 0, and the center distance L is greater than or equal to half of the sum of the tooth heights H1 and H2 of the two threaded segments 120, that is, L>=(H1+H2) / 2. At this time, the screw joint 100 is engaged with the screw 200. The first thread 210 of the screw 200 only partially engages with one of the threaded segments 120, that is, the engagement part 211. The remaining part of the first thread 210 is in a separated or tangential state with the other threaded segment 120 or the retaining rib segment 140 and limits the radial movement stroke of the screw 200, that is, the non-engaging part 212, and makes the screw 200 and the screw hole 110 form an anti-disengagement fit structure. It is understandable that "tooth height" refers to the vertical distance from the crest to the root of the thread segment 120, and "height of the retaining rib segment 140" refers to the radial length of the retaining rib segment 140 from the inner wall of the threaded hole 110 to the axis of the threaded hole 110. "Partial engagement" means that only one end of the first thread 210 is in contact with the thread segment 120, while the other side is not in contact or is tangential. "Anti-disengagement fit structure" refers to the eccentric layout and partial engagement that prevents the screw 200 from arbitrarily disengaging axially. By precisely controlling the center distance, the screw 200 is partially engaged, ensuring that different types of screws 200 can engage with the corresponding thread segment 120 after being screwed into the threaded hole 110, while the other thread segment 120 radially limits the screw 200 to form an anti-disengagement structure. In other embodiments, when the center distance between the axes of the thread segment 120 and the retaining rib segment 140 is greater than or equal to half the sum of the height of the retaining rib segment 140 and the tooth height of the thread segment 120, the structure can be set in the same way.

[0042] In some embodiments, such as Figures 1-2 As shown, when the center distance is equal to half the sum of the tooth heights of the two threaded segments 120, i.e., L = (H1 + H2) / 2, the screw connector 100 and the screw 200 are engaged. The circle containing the major diameter of the screw 200's thread is tangent to the circle containing the minor diameter of the non-engaged threaded segment 120, or the circle containing the major diameter of the screw 200's thread is tangent to a portion of the retaining rib segment 140. It can be understood that by precisely controlling the radial position, collisions and interference between the screw 200 and the non-engaged threaded segment 120 are avoided, while the radial clearance is minimized, improving the stability of the screw 200 during rotation and preventing radial wobble. In other embodiments, when the center distance between the axes of the threaded segment 120 and the retaining rib segment 140 is equal to half the sum of the height of the retaining rib segment 140 and the tooth height of the threaded segment 120, the structure can be similarly configured. In other embodiments, the center distance is equal to half the sum of the height of the retaining rib section 140 and the tooth height of the thread section 120. In this case, the circle containing the major diameter of the thread of the screw 200 is tangent to a portion of the retaining rib section 140.

[0043] Specifically, the principle behind this structural design is as follows: When L < (H1 + H2) / 2, the diameter of the screw 200 is relatively large. At this time, the first thread 210 of the screw 200 will extend into the second thread of another non-meshing thread section 120, and since they are not on the same axis, the screw 200 cannot be screwed in.

[0044] When L>(H1+H2) / 2, the screw 200 thread can be screwed in, the first thread 210 is axially limited but will move radially.

[0045] When L=(H1+H2) / 2, the thread can be screwed in. If the pitch of the second thread in the upper and lower thread segments 120 is the same, the first thread 210 is axially limited but will move slightly radially.

[0046] Therefore, the preferred L = (H1 + H2) / 2 and the second thread pitch of the upper and lower thread segments 120 are different, which limits axial movement and prevents radial movement.

[0047] In some embodiments, such as Figures 4-6 As shown, the other end of the screw 200 is snapped into a mounting panel 310; the screw 200 passes through the limiting guide plate 320 of the mounting panel 310, and the range of motion of the screw 200 in the up, down, left, and right directions is limited by the limiting guide plate 320. It can be understood that "snap-in" means that the screw 200 is detachably connected to the mounting panel 310 through a structure such as a buckle or a slot.

[0048] In some embodiments, such as Figure 3 As shown, a flange 130 is provided around the screw hole 110 to limit the screw 200. A raised rib 220 on the screw 200 is positioned between the thread section and the flange 130, or between the retaining rib section 140 and the flange 130. It can be understood that "flange 130" refers to the annular protrusion structure inside the screw hole 110, whose inner wall is tangent to the outer wall of the screw 200; "raised rib 220" refers to the strip-shaped protrusion on the thread of the screw 200, used for axial limiting. The cooperation of the flange 130 and the raised rib 220 further enhances the axial anti-loosening effect. Simultaneously, the tangency of the flange 130 and the screw 200 assists in radial positioning, improving the overall stability and reliability of the connection.

[0049] like Figure 4 , Figures 7-8As shown, this embodiment provides a concealed water tank, in which the screw 200 of the panel assembly 300 is connected to the drive assembly 410 inside the water tank using any of the screw connectors 100 described above. It can be understood that "concealed water tank" refers to a water tank structure installed inside a wall or cabinet, with only the control panel exposed; "panel assembly 300" refers to the exposed control panel and matching connectors of the water tank; "drive assembly 410" refers to the transmission structure inside the water tank used to control functions such as flushing, such as a motor or connecting rod. By applying the high compatibility, high stability, and anti-detachment advantages of the screw connector 100 to the concealed water tank, the problem of poor compatibility of the screw 200 connection in traditional water tanks is solved, reducing the difficulty of water tank equipment assembly and maintenance, and improving assembly efficiency and user experience. In this embodiment, the screw connector 100 is installed on the drive bracket 420 inside the water tank and connected to the drive assembly 410, which includes a drive lifting rod and a drain valve 430. The panel assembly 300 includes a decorative panel 330 and a mounting panel 310. The mounting panel 310 is detachably connected to the water tank body 400. The screw 200 passes through the mounting panel 310 and is screwed into the screw connector 100. The decorative panel 330 is detachably covered on the mounting panel 310. The panel button 331 on the decorative panel 330 corresponds exactly to the end of the screw 200.

[0050] It should be understood that the various examples described above can be utilized in multiple directions (e.g., tilted, inverted, horizontal, vertical, etc.) and in multiple configurations without departing from the principles of this invention. The embodiments shown in the accompanying drawings are merely examples of effective application of the principles of this invention, and the invention is not limited to any specific details of these embodiments.

[0051] Of course, upon careful consideration of the above description of the representative embodiments, those skilled in the art will readily understand that various modifications, additions, substitutions, deletions, and other changes can be made to these specific embodiments, and that such changes are within the scope of the principles of this invention. Therefore, the foregoing detailed description should be clearly understood as being given by way of illustration and example only, and the spirit and scope of this invention are defined solely by the appended claims and their equivalents.

Claims

1. A screw connector for connecting a corresponding screw (200), characterized in that: The screw connector (100) has a screw hole (110), and at least two threaded segments (120) are provided on the screw hole (110) in the circumferential direction. Alternatively, at least one threaded segment (120) and at least one retaining segment (140) are provided on the screw hole (110) in the circumferential direction. When one end of the screw (200) is engaged with one of the threaded segments (120), the other threaded segment (120) or retaining segment (140) is used to prevent the screw (200) from coming out of the screw hole (110) and to make way for the screw (200) screwing in.

2. The screw joint of claim 1, wherein: The end of the first thread (210) of the screw (200) is only a half thread structure, which is used to screw the screw (200) into the thread section (120) when the screw (200) is screwed into the thread section (120).

3. The screw joint of claim 1, wherein: At least two threaded sections (120) are provided on the screw hole (110), and the thread on the screw (200) forms an effective threaded connection with at least one of the threaded sections (120). At least one of the threaded sections (120) limits the radial movement stroke of the screw (200) to prevent the first thread (210) of the screw (200) from coming out of the second thread of the threaded section (120). Alternatively, the screw hole (110) is provided with at least one threaded section (120) and one retaining section (140), the thread on the screw (200) and the threaded section (120) form an effective threaded connection, and the retaining section (140) limits the radial movement stroke of the screw (200) to prevent the first thread (210) of the screw (200) from coming out of the second thread of the threaded section (120).

4. The screw joint of claim 1 wherein: The shape of the retaining rib section (140) is configured to match the shape of the screw (200). The retaining rib section (140) limits the radial movement stroke of the screw (200) to prevent the first thread (210) of the screw (200) from coming out of the second thread of the thread section (120), to prevent the screw (200) from coming out axially, and to make way for the screw (200) screwing in path.

5. The screw joint of claim 1 wherein: At least two threaded segments (120) are provided along the circumferential direction of the threaded hole (110). Each threaded segment (120) has a different design, and the tooth height, second thread shape or pitch of each threaded segment (120) is different.

6. The screw joint of any one of claims 1 or 5, wherein: The two threaded segments (120) or the threaded segment (120) and the retaining rib segment (140) have a center distance between their axes. The center distance is greater than or equal to half the sum of the tooth heights of the two threaded segments (120) or the center distance is greater than or equal to half the sum of the height of the retaining rib segment (140) and the tooth height of the threaded segment (120). At this time, the screw joint (100) is engaged with the screw (200). The first thread (210) of the screw (200) only partially engages with one of the threaded segments (120). The remaining part of the first thread (210) is separated from or tangent to the other threaded segment (120) or the retaining rib segment (140) and limits the radial movement stroke of the screw (200), so that the screw (200) and the screw hole (110) form an anti-disengagement fit structure.

7. The screw joint of claim 6, wherein: When the center distance is equal to half the sum of the tooth heights of the two threaded segments (120) or the center distance is equal to half the sum of the height of the retaining rib segment (140) and the tooth height of the threaded segment (120), the screw joint (100) is engaged with the screw (200), and the circle containing the major diameter of the screw (200) is tangent to the circle containing the minor diameter of the threaded segment (120) in the non-engaged state or the circle containing the major diameter of the screw (200) is tangent to a portion of the retaining rib segment (140).

8. The screw joint of claim 1 wherein: The other end of the screw (200) is engaged with a mounting panel (310); the screw (200) passes through the limiting guide plate (320) of the mounting panel (310), and the range of motion of the screw (200) in the up, down, left and right directions is limited by the limiting guide plate (320).

9. The screw joint of claim 1 wherein: A flange (130) for limiting the screw (200) is provided around the screw hole (110), and the rib (220) on the screw (200) is limited between the thread section and the flange (130) or between the retaining rib section (140) and the flange (130).

10. A concealed water tank, characterized in that: The screw (200) of its panel assembly (300) is connected to the drive assembly (410) in the water tank using a screw connector (100) as described in any one of claims 1 to 9.

Images