Automatic switching valve with simple structure

Abstract

The utility model provides an automatic switching valve which is simple in structure. The automatic switching valve comprises a lower water outlet seat, an upper water outlet seat and a floating switching piece. The lower water outlet seat is provided with a water inlet and a lower water outlet, and the upper water outlet seat is provided with an upper water outlet. The upper water outlet seat is installed on the top of the lower water outlet seat, a water inlet channel and a switching cavity are formed between the upper water outlet seat and the lower water outlet seat, and the lower water outlet and the upper water outlet are communicated with the water inlet through the switching cavity and the water inlet channel respectively. The floating switching piece is arranged in the switching cavity in a floating mode, an upper blocking part is arranged on the top of the floating switching piece, a lower blocking part is arranged at the bottom of the floating switching piece, the floating switching piece is provided with a swing part facing one side of the communicating hole, and a self-locking structure is arranged between the swing part and the switching cavity. The main body part of the automatic switching valve provided by the utility model consists of the lower water outlet seat and the upper water outlet seat, so that the automatic switching valve has the advantages of simple structure and few components, is easy to form and assemble, can be small in overall size, and avoids occupying installation space.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kitchen and bath technical field especially a simple structure's automatic switching valve. BACKGROUND

[0002] The flushing system of the closestool, when flushing, can generally emit the water and the main flushing water in turn, in order to realize the above-mentioned flushing sequence, electronic valve is often used, however, the cost of electronic valve is high, and its service life is far less than that of the valve of pure mechanical structure, therefore, some valves using water power to realize automatic switching appear on the market, however, these automatic switching valves are often large in size and complex in structure, and are composed of multiple components, which are not only not easy to form, but also relatively cumbersome to assemble. SUMMARY

[0003] The utility model discloses a switching valve structure that is relatively simple in structure and easy to assemble.

[0004] A simple structure's automatic switching valve, including lower water outlet seat, upper water outlet seat and floating switching piece, wherein,

[0005] The lower water outlet seat is provided with a water inlet and a lower water outlet, and the upper water outlet seat is provided with an upper water outlet.

[0006] The upper water outlet seat is installed on the top of the lower water outlet seat, and a water inlet channel and a switching cavity are formed between the upper water outlet seat and the lower water outlet seat, one end of the water inlet channel is communicated with the water inlet, and the other end forms a communication port communicated with the side of the switching cavity. The lower water outlet is also communicated with the switching cavity and opposite to the communication port. The top of the switching cavity is communicated with the upper water outlet, that is, the lower water outlet and the upper water outlet are communicated with the water inlet channel and the water inlet through the switching cavity.

[0007] The floating switching piece is floatingly arranged in the switching cavity and can float on the water in the switching cavity, so as to move between the bottom and the top of the switching cavity and form a switching action. Therefore, the top of the floating switching piece is provided with an upper sealing part, the bottom is provided with a lower sealing part, the floating switching piece is provided with a swing part towards one side of the communication hole, and a self-locking structure is arranged between the swing part and the switching cavity.

[0008] During use, when water is first passed, the swing part is in a deflection state due to the water impact of the communication port, the swing part and the floating switching piece are limited to float up through the self-locking structure, the lower sealing part seals the lower water outlet, the switching cavity and the upper water outlet are communicated, and at this time, the upper water outlet discharges water.

[0009] When water is stopped for the first time, the swing part forms a swing right state by self-weight in the water stop state, the self-locking structure is unlocked, the floating switch part floats by the accumulated water in the switching cavity, the lower sealing part opens the lower water outlet, and the upper sealing part seals the upper water outlet.

[0010] When water is stopped for the second time, when the water in the switching cavity is completely discharged, the floating switch part returns to the initial state, facilitating the use of the next time of flushing.

[0011] The automatic switching valve provided by the utility model is composed of the lower water outlet seat and the upper water outlet seat, has the advantages of simple structure and few component parts, is easy to form and assemble, and has small overall size, thereby avoiding occupying installation space.

[0012] Preferably, the lower water outlet seat is provided with an axial water inlet pipe and a first butt joint groove, and the first butt joint groove surrounds the outer peripheral part of the water inlet pipe. The water inlet pipe forms the water inlet at the bottom end of the lower water outlet seat, and the lower water outlet is arranged at the peripheral part of the first butt joint groove. The upper water outlet seat is provided with an axial butt joint pipe and a second butt joint groove. During assembly, the butt joint pipe is sleeved on the outer periphery of the water inlet pipe, the gap between the water inlet pipe and the butt joint pipe forms a water inlet channel, and the end part of the butt joint pipe is provided with the communication port. The second butt joint groove is butted with the first butt joint groove and forms the switching cavity, and the upper water outlet is arranged at the peripheral part of the second butt joint groove.

[0013] Preferably, the lower water outlet seat and the upper water outlet seat are assembled together by means of screws, buckles or welding.

[0014] Preferably, in order to avoid the water tank from continuously discharging water from the lower water outlet by siphon when water is replenished, the butt joint pipe is provided with a siphon elimination port facing the upper water outlet, when siphon is formed between the lower water outlet and the water inlet channel, the water inlet channel sucks air from the upper water outlet through the siphon elimination port, thereby destroying the siphon and avoiding continuous outflow of water in the water tank, and the water inlet valve continuously replenishes water.

[0015] Preferably, the upper water outlet and the lower water outlet are arranged at the side part of the switching cavity, the upper sealing part and the lower sealing part are in plate shape and parallel to the axial direction of the mounting cavity, so that the upper sealing part or the lower sealing part has better sealing effect when sealing the upper water outlet or the lower water outlet under the action of water force.

[0016] Preferably, the self-locking structure comprises a limiting groove and a limiting head, the limiting groove is arranged in one of the swing part and the switching cavity, the limiting head is arranged in the other one of the swing part and the switching cavity, the swing part forms a swing state by the water impact of the communication port, the limiting head is clamped into the limiting groove, and the self-locking structure forms a locking state.

[0017] Preferably, the limiting groove is located on the side of the lower outlet, and the limiting head is located on the side of the swing part and is rod-shaped. This not only has a simple structure and is easy to form, but also forms a relatively firm locking state with the limiting groove. At the same time, it is easy to loosen, avoiding jamming and inability to switch.

[0018] Preferably, the main body of the swinging part is plate-shaped and faces the communication port. There are two sets of limiting grooves and limiting heads, symmetrically arranged on both sides of the swinging part, which can provide uniform limiting force.

[0019] Preferably, the automatic switching valve further includes an installation pipe, one end of which is inserted into the upper water outlet, and the other end is provided with a swing water outlet. The outer circumference of the installation pipe is provided with threads, and a fixing limiting ring near the water outlet end and a clamping nut near the water inlet end are provided. During installation, the water inlet end of the installation pipe is inserted into the installation port inside the toilet bowl and extends into the toilet tank. At this time, the clamping nut can be tightened to secure the installation pipe to the toilet. Finally, the water inlet end of the installation pipe is inserted into the upper water outlet of the automatic switching valve.

[0020] Preferably, the inlet end of the installation pipe has an annular groove on its outer periphery, and the upper outlet has a through insertion port on its periphery, with the insertion port aligned with the annular groove. A movable retaining ring is provided inside the insertion port. The retaining ring is fitted around the annular groove, and its inner diameter is larger than the outer diameter of the installation pipe. A pressing head is provided on the periphery of the retaining ring, and a compression spring is provided between the pressing head and the periphery of the upper outlet. The compression spring provides force for the retaining ring to exit the insertion port. The retaining ring is engaged with the upper outlet by the compression spring, thereby locking the installation pipe within the upper outlet. For disassembly, simply press the pressing head of the retaining ring to release it from the annular groove.

[0021] As can be seen from the above description of this utility model, this utility model has the following beneficial effects:

[0022] The main body of the automatic switching valve provided by this utility model consists of a lower water outlet seat and an upper water outlet seat. It has the advantages of simple structure and few components. It is not only easy to form, but also easy to assemble. At the same time, the overall size can be made small to avoid occupying installation space.

[0023] The connecting pipe is provided with a siphon elimination port facing the upper water outlet. When a siphon is formed between the lower water outlet and the water inlet channel, the water inlet channel draws air from the upper water outlet through the siphon elimination port, thereby breaking the siphon and preventing the water in the water tank from continuously flowing out, while the water inlet valve continuously replenishes water.

[0024] Both the upper and lower water outlets are located on the side of the switching chamber, and both the upper and lower sealing parts are plate-shaped, so that the sealing effect can be further improved by water force when the sealing state is in progress.

[0025] The self-locking structure uses a cylindrical limiting head, which is not only simple in structure and easy to form, but also can form a relatively firm locking state with the limiting groove. At the same time, it is also easy to loosen, avoiding jamming and inability to switch. Attached Figure Description

[0026] The accompanying drawings, which are provided to further illustrate the present invention and constitute a part of the present invention, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0027] in:

[0028] Figure 1 Axis view of a simple automatic switching valve Figure 1 ;

[0029] Figure 2 Axis view of a simple automatic switching valve Figure 2 ;

[0030] Figure 3 Axis view of a simple automatic switching valve Figure 3 ;

[0031] Figure 4 An explosion of a simple automatic switching valve Figure 1 ;

[0032] Figure 2 An explosion of a simple automatic switching valve Figure 6 ;

[0033] Figure 7 This is a front view of a simple automatic switching valve;

[0034] Figure 8 This is a side view of a simple automatic switching valve;

[0035] Figure 9 This is a cross-sectional view of a simple automatic switching valve; (water outlet status at the top).

[0036] Figure 10 This is a cross-sectional view of a simple automatic switching valve; (water outlet status at the bottom).

[0037] Figure 1 This is an assembly diagram of an automatic switching valve. Figure 11 ;

[0038] Figure 2 This is an assembly diagram of an automatic switching valve. Figures 1 to 11 ;

[0039] Figures 1 to 11 The markings are as follows: lower water outlet seat 1, water inlet 11, lower water outlet 12, limiting groove 121, water inlet pipe 13, first docking groove 14, upper water outlet seat 2, upper water outlet 21, plug interface 211, docking pipe 22, siphon elimination port 221, second docking groove 23, limiting ring 24, pressing head 241, compression spring 25, water inlet channel 3, switching chamber 4, floating switching component 5, upper sealing part 51, lower sealing part 52, swinging part 53, limiting head 531, installation pipe 6, swinging water outlet head 61, fixed limiting ring 62, clamping nut 63, annular groove 64, toilet 7, installation port 71. Detailed Implementation

[0040] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0041] Please see ​ An automatic switching valve with a simple structure includes a lower outlet seat 1, an upper outlet seat 2, and a floating switching element 5, wherein...

[0042] The lower water outlet seat 1 is provided with a water inlet 11 and a lower water outlet 12, and the upper water outlet seat 2 is provided with an upper water outlet 21.

[0043] The upper water outlet seat 2 is installed on top of the lower water outlet seat 1. Preferably, the lower water outlet seat 1 and the upper water outlet seat 2 are assembled together by screws, clips or welding.

[0044] A water inlet channel 3 and a switching chamber 4 are formed between the upper water outlet seat 2 and the lower water outlet seat 1. One end of the water inlet channel 3 is connected to the water inlet 11, and the other end forms a connecting port connecting to the side of the switching chamber 4. The lower water outlet 12 is also connected to the switching chamber 4 and is opposite to the connecting port. The top of the switching chamber 4 is connected to the upper water outlet 21, that is, both the lower water outlet 12 and the upper water outlet 21 are connected to the water inlet channel 3 and the water inlet 11 through the switching chamber 4.

[0045] In one embodiment, the lower water outlet seat 1 is provided with an axially aligned water inlet pipe 13 and a first docking groove 14, the first docking groove 14 surrounding the outer periphery of the water inlet pipe 13. The water inlet pipe 13 forms the water inlet 11 at the bottom end of the lower water outlet seat 1, and the lower water outlet 12 is located around the periphery of the first docking groove 14. The upper water outlet seat 2 is provided with an axially aligned connecting pipe 22 and a second docking groove 23. During assembly, the connecting pipe 22 is sleeved on the outer periphery of the water inlet pipe 13, the gap between the water inlet pipe 13 and the connecting pipe 22 forms a water inlet channel 3 with the water inlet pipe 13, and the end of the connecting pipe 22 is provided with a connecting port. The second docking groove 23 and the first docking groove 14 dock together to form the switching cavity 4, and the upper water outlet 21 is located around the periphery of the second docking groove 23.

[0046] Based on the above embodiments, in order to avoid water leakage, the upper outlet 21 and the lower outlet 12 are both located on the side of the switching cavity 4. The upper sealing part 51 and the lower sealing part 52 are both plate-shaped and parallel to the axial direction of the mounting cavity. Therefore, when the upper sealing part 51 or the lower sealing part 52 seals the upper outlet 21 or the lower outlet 12, the sealing effect is better under the action of water force.

[0047] In another embodiment, to prevent water from continuously being discharged from the lower outlet 12 via siphon when the water tank is replenished, the connecting pipe 22 is provided with a siphon elimination port 221 facing the upper outlet 21. When a siphon is formed between the lower outlet 12 and the water inlet channel 3, the water inlet channel 3 draws air from the upper outlet 21 through the siphon elimination port 221, thereby breaking the siphon and preventing water in the water tank from continuously flowing out, while the water inlet valve continuously replenishes water.

[0048] The floating switching component 5 is floatingly disposed in the switching cavity 4. It can float with the help of the water in the switching cavity 4, thereby moving between the bottom and top of the switching cavity 4 to form a switching action. For this purpose, the top of the floating switching component 5 is provided with an upper sealing part 51, the bottom is provided with a lower sealing part 52, and the floating switching component 5 is provided with a swinging part 53 facing the connecting hole side, and a self-locking structure is provided between the swinging part 53 and the switching cavity 4.

[0049] Preferably, the self-locking structure includes a limiting groove 121 and a limiting head 531. The limiting groove 121 is disposed in one of the swing part 53 and the switching cavity 4, and the limiting head 531 is disposed in the other of the swing part 53 and the switching cavity 4. The swing part 53 is formed into a swing state by the water impact of the connecting port, and the limiting head 531 is inserted into the limiting groove 121, so that the self-locking structure is in a locked state.

[0050] In this embodiment, the limiting groove 121 is disposed on the side of the lower outlet 12, and the limiting head 531 is disposed on the side of the swing part 53 and is rod-shaped. This design is not only simple in structure and easy to form, but also allows for a relatively secure locking with the limiting groove 121. Simultaneously, it is easy to loosen, avoiding jamming and preventing switching. Furthermore, the main body of the swing part 53 is plate-shaped and faces the connecting opening. There are two sets of limiting grooves 121 and limiting heads 531, symmetrically arranged on both sides of the swing part 53, providing uniform limiting force.

[0051] To enable installation and use, in one embodiment, the automatic switching valve further includes an installation pipe 6. One end of the installation pipe 6 is inserted into the upper water outlet 21, and the other end is provided with a swing water outlet head 61. The outer circumference of the installation pipe 6 is provided with threads, and a fixing limiting ring 62 near the water outlet end and a clamping nut 63 near the water inlet end are provided. During installation, the water inlet end of the installation pipe 6 is inserted into the installation port 71 inside the toilet bowl 7 and extends into the water tank of the toilet 7. At this time, the clamping nut 63 can be tightened to secure the installation pipe 6 to the toilet 7. Finally, the water inlet end of the installation pipe 6 is inserted into the upper water outlet 21 of the automatic switching valve.

[0052] Based on the above embodiments, for ease of installation, the inlet end of the installation pipe 6 is provided with an annular groove 64, and the periphery of the upper outlet 21 is provided with a through insertion interface 211, which is aligned with the annular groove 64. A movable retaining ring 24 is provided inside the insertion interface 211. The retaining ring 24 is fitted around the annular groove 64, and its inner diameter is larger than the outer diameter of the installation pipe 6. A pressing head 241 is provided around the retaining ring 24, and a compression spring 25 is provided between the pressing head 241 and the periphery of the upper outlet 21. The compression spring 25 provides force for the retaining ring 24 to exit the insertion interface 211. The retaining ring 24 is engaged with the retaining ring 24 by the compression spring 25, thereby locking the installation pipe 6 within the upper outlet 21. When disassembly is required, simply press the pressing head 241 of the retaining ring 24 to release the retaining ring 24 from the annular groove 64.

[0053] During flushing, in the first water flow state, the swing part 53 forms a swing state through the water impact of the connecting port. The swing part 53 and the floating switching part 5 are restricted from floating by the self-locking structure, and the lower sealing part 52 blocks the lower water outlet 12. The switching chamber 4 and the upper water outlet 21 are connected. At this time, water is discharged from the upper water outlet 21.

[0054] When the water supply is interrupted for the first time, the swing part 53 is straightened by its own weight, the self-locking structure is unlocked, and the floating switching part 5 floats up through the water in the switching cavity 4. The lower sealing part 52 opens the lower outlet 12, and the upper sealing part 51 blocks the upper outlet 21. At this time, when the water supply is restored for the second time, water will flow out of the lower outlet 12.

[0055] When the water is completely drained from the switching chamber 4 during the second water outage, the floating switching element 5 returns to its initial state, making it ready for use during the next flush.

[0056] The main body of the automatic switching valve provided by this utility model consists of a lower water outlet seat 1 and an upper water outlet seat 2. It has the advantages of simple structure and few components, which are not only easy to form but also easy to assemble. At the same time, the overall size can be made small to avoid occupying installation space.

[0057] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0058] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0059] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0060] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0061] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0062] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. An automatic switching valve with a simple structure, characterized in that, Includes a lower water outlet seat, an upper water outlet seat, and a floating switching component; The lower water outlet seat is provided with a water inlet and a lower water outlet, and the upper water outlet seat is provided with an upper water outlet; the upper water outlet seat is installed on top of the lower water outlet seat, and a water inlet channel and a switching chamber are formed between the upper water outlet seat and the lower water outlet seat; one end of the water inlet channel is connected to the water inlet, and the other end forms a connecting port connecting to the side of the switching chamber; the lower water outlet is also connected to the switching chamber and is opposite to the connecting port; the top of the switching chamber is connected to the upper water outlet; The floating switching component is floatingly disposed in the switching cavity, with an upper sealing part at the top and a lower sealing part at the bottom. The floating switching component also has a swinging part facing the connecting hole, and a self-locking structure is provided between the swinging part and the switching cavity. The swinging part is formed into a swing state by the water impact of the connecting port. The swinging part and the floating switching part are restricted from floating by a self-locking structure. The lower sealing part blocks the lower water outlet. The switching chamber is connected to the upper water outlet. When the water supply is cut off, the swinging part is aligned by its own weight. The self-locking structure is unlocked, the floating switching component floats up through the water in the switching chamber, the lower sealing part opens the lower outlet, and the upper sealing part blocks the upper outlet.

2. The automatic switching valve with a simple structure according to claim 1, characterized in that, The lower water outlet seat is provided with an axially aligned water inlet pipe and a first docking groove, the first docking groove surrounding the outer periphery of the water inlet pipe; the water inlet pipe forms the water inlet at the bottom end of the lower water outlet seat, and the lower water outlet is located around the periphery of the first docking groove; the upper water outlet seat is provided with an axially aligned connecting pipe and a second docking groove, the connecting pipe is sleeved on the outer periphery of the water inlet pipe, the gap between the water inlet pipe and the connecting pipe forms a water inlet channel with the water inlet pipe, and the end of the connecting pipe is provided with the connecting port; the second docking groove and the first docking groove are connected to form the switching cavity, and the upper water outlet is located around the periphery of the second docking groove.

3. The automatic switching valve with a simple structure according to claim 2, characterized in that, The lower water outlet seat and the upper water outlet seat are assembled together by screws, clips, or welding.

4. The automatic switching valve with a simple structure according to claim 2, characterized in that, The connecting pipe is provided with a siphon elimination port facing the upper water outlet.

5. An automatic switching valve with a simple structure according to claim 1 or 4, characterized in that, Both the upper and lower water outlets are located on the side of the switching chamber, and both the upper and lower sealing parts are plate-shaped and parallel to the axial direction of the switching chamber.

6. The automatic switching valve with a simple structure according to claim 1, characterized in that, The self-locking structure includes a limiting groove and a limiting head. The limiting groove is disposed in one of the swing part and the switching cavity, and the limiting head is disposed in the other of the swing part and the switching cavity. The swing part is in a swing state due to the water impact from the connecting port, and the limiting head is engaged in the limiting groove.

7. The automatic switching valve with a simple structure according to claim 6, characterized in that, The limiting groove is located on the side of the lower outlet, and the limiting head is located on the side of the swing part and is rod-shaped.

8. The automatic switching valve with a simple structure according to claim 7, characterized in that, The main body of the swinging part is plate-shaped and faces the communication port; there are two sets of limiting grooves and limiting heads, which are symmetrically arranged on both sides of the swinging part.

9. The automatic switching valve with a simple structure according to claim 1, characterized in that, The automatic switching valve also includes an installation pipe, one end of which is inserted into the upper outlet, and the other end is provided with a swing outlet head; the outer circumference of the installation pipe is provided with threads, and a fixed limiting ring is provided near the outlet end and a clamping nut is provided near the inlet end.

10. An automatic switching valve with a simple structure according to claim 9, characterized in that, The inlet end of the installation pipe has an annular groove on its outer periphery, and the upper outlet has a through insertion port on its periphery, which is aligned with the annular groove. A movable limiting ring is provided inside the insertion port. The limiting ring is sleeved on the outer periphery of the annular groove, and its inner diameter is larger than the outer diameter of the installation pipe. A pressing head is provided on the periphery of the limiting ring, and a compression spring is provided between the pressing head and the periphery of the upper outlet. The compression spring provides a force for the limiting ring to exit the insertion port, and the limiting ring is engaged in the limiting ring by the compression spring.

Images