CN209265019U - A kind of small-sized wet plug opto-electric connector - Google Patents

Abstract

The utility model relates to field of connectors, a kind of small-sized wet plug opto-electric connector, the plug casing main body of plug is tubulose, the tail end inner wall of plug casing has annular protrusion, part internal ring wall between annular protrusion and the endpiece of plug casing is equipped with internal screw thread, the leading portion outer wall of plug casing is equipped with external screw thread, and the first nut is threaded at the leading portion external screw thread of plug casing；Square plate housing body is tubulose, the axially extending formation insertion section of external disk shell head end, the outer ring surface formation external screw thread of insertion section, the inner wall of socket seal pad insertion section and the angle of square plate shell head end in socket；Socket insulator component is inserted into the inside of square plate front housing section, sealing ring is equipped between socket insulator component and square plate inner walls, socket insulator component includes socket insertion body and socket insulator, and socket insulator is wrapped in outside socket optical fiber component.

Description

A kind of small-sized wet plug opto-electric connector

Technical field

The utility model relates to field of connectors, the photoelectricity wire and cable connector that is especially laid under water.

Background technique

Wire and cable connector is primarily adapted for use in all kinds of digital SPC exchanges of transmission device office, the inside connection of photoelectricity transmission equipment Signal transmission between distributing frame, traditional underwater opto-electric connector do not have individual fiber optic and sealing structure, body Product is big and sealing position is few, applies in the photoelectricity transmission of ship signal system, not convenient enough, reliable.

People are highly desirable to obtain a kind of small in size, structure novel, and the excellent underwater Optoelectric hybrid of sealing effect connects Connect device.

Utility model content

It, can moist ring under water to solve the above problems, the utility model proposes a kind of small-sized wet plug opto-electric connector It is used under the complex situations such as border.

In order to achieve the above purposes, the technical solution adopted by the utility model is:

A kind of small-sized wet plug opto-electric connector comprising plug and socket,

Wherein plug includes plug casing, plug partition, the first nut, plug insulator component, equivalent sealing ring, second The big clamp nut of nut, plug and plug fibers component, wherein plug casing main body is tubulose, and the tail end inner wall of plug casing has There is annular protrusion, the part internal ring wall between annular protrusion and the endpiece of plug casing is equipped with internal screw thread, before plug casing Section outer wall is equipped with external screw thread, and the first nut is threaded at the leading portion external screw thread of plug casing；Plug partition, plug insulator The big clamp nut of component, plug, plug fibers component are mounted on inside the head section of plug casing, wherein plug insulator component packet The head section of the positioning jack for including the insulator being wrapped in around plug fibers component and being arranged in inside insulator, positioning jack is set There is equivalent sealing ring, the tail portion of plug insulator component and plug fibers component is arranged in plug partition, and plug partition is for dividing Every plug insulator component, plug fibers component and rear cable；Insertion chamber is formed between second nut and plug casing；

Socket includes socket partition, socket optical fiber component, socket insulator component, the big clamp nut of socket, socket seal Pad and square plate shell, wherein square plate housing body is tubulose, the axially extending formation insertion section of external disk shell head end, insertion section it is outer Anchor ring forms external screw thread, and socket seal pads the inner wall of insertion section and the angle of square plate shell head end；Socket insulator component is inserted Sealing ring, socket insulator are equipped between the inside of square plate front housing section, socket insulator component and square plate inner walls Component includes socket insertion body and socket insulator, and socket insulator is wrapped in outside socket optical fiber component, the big compression spiral shell of socket Mother is connected to the inner wall head section of square plate shell by external screw thread, and the big clamp nut of socket is used to limit the axis of socket insulator component To position；

Plug and socket cooperation when, plug insulator component and socket insulator component cooperation, plug fibers component and The docking of socket optical fiber component, and insertion section is inserted into insertion chamber, and plug casing is connected at socket seal pad, the second nut it is interior Sealing ring is arranged in the surface of screw thread and the cooperation of the external screw thread of insertion section, inner ring surface and the plug casing cooperation of insertion section.

Preferably, the small-sized wet plug opto-electric connector further includes tail folder nut, gasket and spigot seal pad, institute Stating tail folder nut is circular tube shaped, and the outer ring surface of tail folder nut has external screw thread, and tail presss from both sides the external screw thread and plug casing of nut The screw-internal thread fit of endpiece is installed, so that the end face of tail folder nut and annular protrusion side wall cooperation holding shim and spigot seal Pad.

Preferably, the gasket and spigot seal are lined with two groups, and two groups of gaskets and the setting of spigot seal pad interval.

Preferably, the plug casing is equipped with boss, which is arranged in the tail portion at external screw thread, the first nut and The inner wall tail end of second nut is respectively equipped with bulge-structure, and the bulge-structure and boss cooperate, for limiting the first nut and the Two nuts move axially position.

Preferably, first nut and the second nut are respectively provided with through the first nut and the second nut annular wall Screw hole, holding screw is installed in the screw hole, the holding screw is for limiting the first nut and the second nut and plug casing Relative position.

Preferably, the socket optical fiber component includes porcelain bushing, fiber stub, optical fiber component sealing ring, optical fiber Shell, spring and tailgate, wherein fiber optic is tubulose, and tailgate is mounted on fiber optic tail end, the leading portion of fiber optic inner wall Equipped with annular convex platform, porcelain bushing is attached to fiber optic annular boss towards the inner wall of inserting paragraph side, fiber stub peace In fiber optic, and the outside of fiber stub is coated with columned limit section, which is connected to convex annular The side wall of platform, spring one end are connected on tailgate, and the other end is connected on the tail end face of limit section, make fiber stub can be in light Axial float in fine shell.

Preferably, to be provided with optical fiber component close for the limit section outer ring surface and the opposite position of fiber optic internal ring wall Seal；Optical fiber component sealing ring has two groups；Limiting section outer ring surface has groove, and the insertion of optical fiber component sealing ring is mounted on groove It is interior.

Preferably, having several positioning annular protrusions, the positioning annular protrusion on the fiber optic outer ring surface For axially position fiber optic；The tail end face for limiting section has columnar suit section, and the suit section and limit section are concentric, It is set with section and diameter is less than limit section diameter, spring pocket is in suit section.

Preferably, the socket insulator component includes inserting paragraph and waterproof section, wherein inserting paragraph is cylinder, institute Stating waterproof section is truncated cone, the tail end face and waterproof paragraph header end surface integrally connected of inserting paragraph and concentric setting, waterproof Paragraph header end surface is less than waterproof segment trailer end face；Plug insulator component has positioning jack, and positioning jack main body is elastic material Material is made, and the head section part wall thickness of positioning jack is greater than positioning jack main body wall thickness and forms equivalent sealing ring；Socket insulator When component and plug insulator component dock, inserting paragraph is inserted into positioning jack, the outer ring surface of waterproof section and equivalent sealing ring Position abuts to form waterproof construction.

Preferably, the excessive position between the head end and inserting paragraph outer ring surface of inserting paragraph forms rounded corners； There are three equivalent sealing rings；Excessive position between the head end of waterproof section and the outer ring surface of waterproof section forms rounded corners.

Using the beneficial effects of the utility model are:

The utility model devises a kind of small-sized wet plug photoelectric mixed connector, and small product size is small, structure novel, can be Photoelectric hybrid transmission is carried out in underwater environment, and plug operation can be carried out within the short time for leaving the water surface.With traditional Underwater Optical Electric connector is compared, and new-type fiber optic and sealing structure are had devised, and is limited by optical fiber rear shell to optical fiber spring, The dynamic sealing of installation space and optical fiber contact can effectively be saved, it is ensured that sealed reliable.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the plug and socket mated condition of the small-sized wet plug opto-electric connector of the utility model.

Fig. 2 is the plug construction schematic diagram of the small-sized wet plug opto-electric connector of the utility model.

Fig. 3 is the socket structure schematic diagram of the small-sized wet plug opto-electric connector of the utility model.

Fig. 4 is the optical fiber component mounting structure schematic diagram of the small-sized wet plug opto-electric connector of the utility model.

Fig. 5 is the small-sized wet plug opto-electric connector contact sealed structural schematic diagram of the utility model.

Appended drawing reference includes:

10- plug, 101- tail press from both sides nut, 102- gasket, 103- spigot seal pad, 104- plug casing, 105- plug every Plate, the first nut of 106-, 107- plug insulator component, the equivalent sealing ring of 1071-, the second nut of 108-, the big pressure of 109- plug Tight nut, 110- holding screw, 111- plug fibers component；

20- socket, 201- socket partition, 202- socket optical fiber component, 203- socket insulator component, 2031- waterproof section, 2032- inserting paragraph, the big clamp nut of 204- socket, 205- socket seal pad, 206- square plate shell；

2021- porcelain bushing, 2022- fiber stub, 2023- optical fiber component sealing ring, 2024- fiber optic, 2025- limit Position section, 2026- spring, 2027- tailgate.

Specific embodiment

The utility model is described in detail below in conjunction with attached drawing.

As Figure 1-Figure 5, a kind of small-sized wet plug opto-electric connector is present embodiments provided comprising plug 10 and insert Seat 20 docks.

Wherein plug 10 includes that tail presss from both sides nut 101, gasket 102, spigot seal pad 103, plug casing 104, plug partition 105, the first nut 106, plug insulator component 107, equivalent sealing ring 1071, the second nut 108, the big clamp nut of plug 109 and plug fibers component 111, wherein plug casing 104 is tubulose, and the tail end inner wall of plug casing 104 has annular protrusion, Part internal ring wall between annular protrusion and the endpiece of plug casing 104 is equipped with internal screw thread, and the tail folder nut 101 is round tube Shape, and tail folder nut 101 outer ring surface have external screw thread, tail press from both sides nut 101 external screw thread and plug casing 104 endpiece it is interior It is threadedly engaged installation, so that the end face of tail folder nut 101 and annular protrusion side wall cooperation holding shim 102 and spigot seal pad 103, the leading portion outer wall of plug casing 104 is equipped with external screw thread, and the first nut 106 is threaded in outside the leading portion of plug casing 104 At screw thread；The big clamp nut 109 of plug partition 105, plug insulator component 107, plug, plug fibers component 111 are mounted on Inside the head section of plug casing 104, wherein plug insulator component 107 is wrapped in exhausted around plug fibers component 111 The head section of edge body and the positioning jack being arranged in inside insulator, positioning jack is equipped with equivalent sealing ring 1071, plug partition 105 The tail portion of plug insulator component 107 and plug fibers component 111 is set, and plug partition 105 is for separating plug insulator Component 107, plug fibers component 111 and rear cable；Insertion chamber is formed between second nut 108 and plug casing 104；

Socket 20 includes socket partition 201, socket optical fiber component 202, socket insulator component 203, the big compression spiral shell of socket Mother 204, socket seal pad 205 and square plate shell 206, wherein 206 main body of square plate shell is tubulose, and external disk shell head end axially prolongs It stretches to form insertion section, the outer ring surface of insertion section forms external screw thread, and socket seal pads the inner wall and square plate shell 206 of 205 insertion sections The angle of head end；Socket insulator component 203 is inserted into the inside of 206 leading portion of square plate shell, 203 He of socket insulator component Sealing ring is equipped between 206 inner wall of square plate shell, socket insulator component 203 includes that 20 insertion body of socket and socket 20 insulate Body, 20 insulator of socket are wrapped in outside socket optical fiber component 202, and the big clamp nut 204 of socket passes through the external screw thread side of being connected to The inner wall head section of disk shell 206, the big clamp nut 204 of socket are used to limit the axial position of socket insulator component 203；

When plug 10 and socket 20 cooperate, plug insulator component 107 and socket insulator component 203 cooperate, plug Optical fiber component 111 and socket optical fiber component 202 dock, and insertion section is inserted into insertion chamber, and it is close that plug casing 104 is connected to socket At packing 205, the internal screw thread of the second nut 108 and the external screw thread cooperation of insertion section, the inner ring surface and plug casing 104 of insertion section Sealing ring is arranged in the surface of cooperation.

Gasket 102 and spigot seal pad 103 have two groups, and two groups of gaskets 102 and the setting of the interval of spigot seal pad 103.Two Group gasket 102 and spigot seal pad 103 reinforce waterproof.

Plug casing 104 is equipped with boss, which is arranged in the tail portion at external screw thread, the first nut 106 and the second nut 108 inner wall tail end is respectively equipped with bulge-structure, and the bulge-structure and boss cooperate, for limiting the first nut 106 and second Nut 108 moves axially position.The structure is simple, and can realize 108 axially position of the first nut 106 and the second nut, avoids First nut 106 and the second nut 108, which are crossed, to be moved.

First nut 106 and the second nut 108 are respectively provided with through 108 annular wall of the first nut 106 and the second nut Screw hole is equipped with holding screw 110 in the screw hole, and the holding screw 110 is for limiting the first nut 106 and the second nut 108 With the relative position of plug casing 104.110 lockable the first nut 106 of holding screw and the second nut 108, avoid the first spiral shell Cap 106 and the second nut 108 loosen.

Socket seal pad 205 is the Gask-O-Seal that cross section is rectangle.

In the present embodiment, after plug 10 and socket 20 dock, square plate shell 206 is inserted into Fig. 2 plug casing 104 and the Between two nuts 108, the second nut 108 is then turned, the second nut 108 and 206 insertion section outer ring surface of square plate shell pass through spiral shell Line cooperation, the head end and socket seal pad 205 of plug casing 104 form sealing, the inner wall and plug casing 104 of insertion section Sealing ring on outer ring surface forms sealing, and plug insulator component 107 and 104 interface of plug casing form sealing, and socket is exhausted Edge body component 203 and 206 inner wall interface of square plate shell form sealing.

So that this plug 10 and 20 structure of socket act the sealing to form multiple labyrinth-like by simply docking, while by inserting The docking of head insulation components 107 and socket insulator component 203, so that 20 insulator of plug insulator component 107 and socket In addition to playing the role of insulator, butt junction location is also acted as, socket optical fiber component 202 and plug fibers component are facilitated 111 connect.

Tail presss from both sides the cooperation that nut 101, gasket 102 and spigot seal pad 103 threes, realizes that 10 tail portion of plug is connected with cable The waterproof sealing of position.Similar, the sealing ring group of 20 tail position of socket is realized and the waterproof sealing of cable connection locations.

The cooperation of fiber optic 2024 and insulator simultaneously mainly using plastic pressure forming technology is inlayed, utilizes high-precision Mold contact is positioned, the fiber optic 2024 and the insulator that specially design are inlayed and are integrally formed, ensure that light The concentricity of fine shell 2024.

As shown in figure 4, socket optical fiber component 202 includes porcelain bushing 2021, fiber stub 2022, light in the present embodiment Fine component sealing ring 2023, fiber optic 2024, spring 2026 and tailgate 2027, wherein fiber optic 2024 is tubulose, tailgate 2027 are mounted on 2024 tail end of fiber optic, and the leading portion of 2024 inner wall of fiber optic is equipped with annular convex platform, and porcelain bushing 2021 pastes It is attached to inner wall of the 2024 annular boss of fiber optic towards 2032 side of inserting paragraph, fiber stub 2022 is mounted on fiber optic In 2024, and the outside of fiber stub 2022 is coated with columned limit section 2025, which is connected to ring The side wall of shape boss, 2026 one end of spring are connected on tailgate 2027, and the other end is connected on the tail end face of limit section 2025, Make fiber stub 2022 can in fiber optic 2024 axial float.

Limit 2025 outer ring surface of section and the opposite position of 2024 internal ring wall of fiber optic are provided with optical fiber component sealing ring 2023.Optical fiber component sealing ring 2023 further functions as the effect of anti-water segregation.

Plug fibers component 111 is similar with 202 structure of socket optical fiber component, repeats no more.

In the present embodiment, optical fiber component sealing ring 2023 has two groups.

Limiting 2025 outer ring surface of section has groove, and what optical fiber component sealing ring 2023 was embedded in is mounted in groove.To limit The position of optical fiber component sealing ring 2023.

There is several positioning annular protrusions, which is used for axially position on 2024 outer ring surface of fiber optic Fiber optic 2024.Positioning annular raised role is to limit the position of fiber optic 2024.

The tail end face for limiting section 2025 has columnar suit section, and the suit section and limit section 2025 are concentric, suit Section and diameter are less than limit 2025 diameter of section, and spring 2026 is sleeved in suit section.So that the volume of this socket optical fiber component 202 It is small and exquisite, functional.

When using this socket optical fiber component 202, as when fiber stub 2022 is axial to meet obstructions, fiber stub 2022 is driven The limit section 2025 at rear overcomes 2026 resistance of the spring mobile lesser distance of side direction to the right, in the case where fiber alignment, Spring 2026 plays the role of the docking of pressed fiber lock pin 2022, so that optical fiber does not connect uncertain and has certain antihunt action.

While guaranteeing product hermeticity the spacing of optical fiber contact body is greatly reduced, effectively in socket optical fiber component 202 The overall volume and quality for reducing product, increase the installation space of product.

As shown in figure 5, insulator die group includes the socket insulator component 203 and plug that can be mutually butted in the present embodiment Insulation components 107, socket insulator component 203 include inserting paragraph 2032 and waterproof section 2031, and wherein inserting paragraph 2032 is circle Cylindricality, the waterproof section 2031 are truncated cone, and the tail end face and 2031 head end of waterproof section of inserting paragraph 2032 integrally connect It connects and concentric setting, 2031 head end of waterproof section is less than 2031 tail end face of waterproof section；Plug insulator component 107 has Positioning jack, positioning jack main body are made of elastic material, and the head section part wall thickness of positioning jack is greater than positioning jack main wall Thickness simultaneously forms equivalent sealing ring 1071；When socket insulator component 203 and plug insulator component 107 dock, inserting paragraph 2032 It is inserted into positioning jack, the outer ring surface of waterproof section 2031 abuts to form waterproof construction with equivalent 1071 position of sealing ring.

Excessive position between 2032 outer ring surface of head end and inserting paragraph of inserting paragraph 2032 forms rounded corners.Insertion Rounded corners at section 2032 facilitate inserting paragraph 2032 to be inserted into positioning jack.

There are three equivalent sealing rings 1071.

Excessive position between the head end of waterproof section 2031 and the outer ring surface of waterproof section 2031 forms rounded corners.This Rounded corners facilitate the head of waterproof section 2031 to be inserted into equivalent 1071 position of sealing ring, play the role of guiding.

After contact pin insulator and jack insulator plug together, 0 type circle of jack insulator is extruded in the conical surface of contact pin insulator On, it realizes the independent sealing function of each contact, plays the role of electric insulation, it is ensured that every circuit works normally.It bores simultaneously Face is designed so that product discharges inner water droplets in docking, to reduce docking resistance.Connect photoelectricity by principles above Connecing device becomes the underwater connector with wet plug characteristic.

The above content is only the preferred embodiment of the utility model, for those of ordinary skill in the art, according to this reality It, in specific embodiments and applications can be with many changes may be made, as long as these variations are without departing from this with novel thought The design of utility model, belongs to the protection scope of the utility model.

Claims (10)

1. a kind of small-sized wet plug opto-electric connector, it is characterised in that: it includes plug and socket,

Wherein plug includes plug casing, plug partition, the first nut, plug insulator component, equivalent sealing ring, the second spiral shell The big clamp nut of cap, plug and plug fibers component, wherein plug casing main body is tubulose, and the tail end inner wall of plug casing has Part internal ring wall between the endpiece of annular protrusion, annular protrusion and plug casing is equipped with internal screw thread, the leading portion of plug casing Outer wall is equipped with external screw thread, and the first nut is threaded at the leading portion external screw thread of plug casing；Plug partition, plug insulator group The big clamp nut of part, plug, plug fibers component are mounted on inside the head section of plug casing, and wherein plug insulator component includes The insulator being wrapped in around plug fibers component and the positioning jack being arranged in inside insulator, the head section of positioning jack are equipped with The tail portion of plug insulator component and plug fibers component is arranged in equivalent sealing ring, plug partition, and plug partition is for separating Plug insulator component, plug fibers component and rear cable；Insertion chamber is formed between second nut and plug casing；

Socket include socket partition, socket optical fiber component, socket insulator component, the big clamp nut of socket, socket seal pad and Square plate shell, wherein square plate housing body is tubulose, the axially extending formation insertion section of external disk shell head end, the outer ring surface of insertion section External screw thread is formed, socket seal pads the inner wall of insertion section and the angle of square plate shell head end；Socket insulator component is inserted into The inside of square plate front housing section is equipped with sealing ring, socket insulator component between socket insulator component and square plate inner walls Including socket insertion body and socket insulator, socket insulator is wrapped in outside socket optical fiber component, and the big clamp nut of socket is logical The inner wall head section that external screw thread is connected to square plate shell is crossed, the big clamp nut of socket is used to limit the axial position of socket insulator component It sets；

In plug and socket cooperation, plug insulator component and the cooperation of socket insulator component, plug fibers component and socket Optical fiber component docking, and insertion section is inserted into insertion chamber, plug casing is connected at socket seal pad, the internal screw thread of the second nut Cooperate with the external screw thread of insertion section, sealing ring is arranged in the surface of inner ring surface and the plug casing cooperation of insertion section.

2. small-sized wet plug opto-electric connector according to claim 1, it is characterised in that: the small-sized wet plug photoelectricity connects Connecing device further includes tail folder nut, gasket and spigot seal pad, and the tail folder nut is circular tube shaped, and tail presss from both sides the outer ring mask of nut There is external screw thread, tail presss from both sides the screw-internal thread fit installation of the external screw thread of nut and the endpiece of plug casing, so that the end face of tail folder nut Cooperate holding shim and spigot seal pad with annular protrusion side wall.

3. small-sized wet plug opto-electric connector according to claim 2, it is characterised in that: the gasket and spigot seal pad There are two groups, and two groups of gaskets and the setting of spigot seal pad interval.

4. small-sized wet plug opto-electric connector according to claim 1, it is characterised in that: the plug casing is equipped with convex Platform, the boss are arranged in the tail portion at external screw thread, and the inner wall tail end of the first nut and the second nut is respectively equipped with bulge-structure, should Bulge-structure and boss cooperate, for limiting the first nut and the second nut axial movement position.

5. small-sized wet plug opto-electric connector according to claim 1, it is characterised in that: first nut and the second spiral shell Cap is respectively provided with the screw hole through the first nut and the second nut annular wall, is equipped with holding screw in the screw hole, the clamp screw Nail is for limiting the relative position of the first nut and the second nut and plug casing.

6. small-sized wet plug opto-electric connector according to claim 1, it is characterised in that: the socket optical fiber component includes Porcelain bushing, fiber stub, optical fiber component sealing ring, fiber optic, spring and tailgate, wherein fiber optic is tubulose, tailgate It is mounted on fiber optic tail end, the leading portion of fiber optic inner wall is equipped with annular convex platform, and porcelain bushing is attached to fiber optic inner ring Shape boss is towards the inner wall of inserting paragraph side, and fiber stub is mounted in fiber optic, and the outside of fiber stub is coated with circle Columnar limit section, the limit paragraph header end are connected to the side wall of annular convex platform, and spring one end is connected on tailgate, and the other end abuts Limit section tail end face on, make fiber stub can in fiber optic axial float.

7. small-sized wet plug opto-electric connector according to claim 6, it is characterised in that: the limit section outer ring surface and light The opposite position of fine shell internal ring wall is provided with optical fiber component sealing ring；Optical fiber component sealing ring has two groups；Limit section outer ring surface With groove, the insertion of optical fiber component sealing ring is mounted in groove.

8. small-sized wet plug opto-electric connector according to claim 6, it is characterised in that: on the fiber optic outer ring surface Annular protrusion is positioned with several, which is used for axially position fiber optic；Limit the aft end mask of section There is columnar suit section, the suit section and limit section are concentric, are set with section and diameter is less than limit section diameter, spring pocket is mounted in set It fills in section.

9. small-sized wet plug opto-electric connector according to claim 1, it is characterised in that: the socket insulator component packet Inserting paragraph and waterproof section are included, wherein inserting paragraph is cylinder, and the waterproof section is truncated cone, the tail end face of inserting paragraph and anti- Water paragraph header end surface integrally connected and concentric setting, waterproof paragraph header end surface are less than waterproof segment trailer end face；Plug insulator Component has positioning jack, and positioning jack main body is made of elastic material, and the head section part wall thickness of positioning jack is greater than positioning and inserts Hole main body wall thickness simultaneously forms equivalent sealing ring；When socket insulator component and plug insulator component dock, inserting paragraph is inserted into In positioning jack, the outer ring surface of waterproof section abuts to form waterproof construction with equivalent sealing ring position.

10. small-sized wet plug opto-electric connector according to claim 9, it is characterised in that: the head end of inserting paragraph and Excessive position between inserting paragraph outer ring surface forms rounded corners；There are three equivalent sealing rings；The head end of waterproof section and anti- Excessive position between the outer ring surface of water section forms rounded corners.