CN206175893U - Explosion -proof flexible connecting pipe - Google Patents

Abstract

The utility model provides an explosion -proof flexible connecting pipe, including connecting pipe, nipple, outer union and outer tube, the nipple is kept away from the one end of connecting pipe is equipped with along the connecting portion of its length direction extension, and the outer union pass through connection structure with the nipple is kept away from the one end fastening of connecting pipe links to each other, the connecting portion correspondence stretch through in in the port cavity of outer union, connecting portion with form between the outer union and be used for keeping apart the flame proof clearance of extinguishing the electric spark. The utility model discloses an it can extinguish the electric spark total number of transmitting the extension in the space that has reasonable length distance and interval to set up the flame proof clearance, and the security performance is better, can be as the explosion -proof 1 district zone who is applied to explosive gas atmosphere of flame -proof type and 2 districts among the zone, and application scope is wider, and the nipple is suitable for through the outer tube and connects polytype connecting pipe, connects reliable firmly, and the practicality is strong.

Description

A kind of explosion-proof flexible connection pipe

Technical field

This utility model is related to connecting tube technical field, and in particular to a kind of explosion-proof flexible connection pipe.

Background technology

Explosion-proof flexible pipe is applied to atmosphere existing explosive mixtures, used as explosion-proof electric equipment conduct on electrical line setting pipeline Connecting line pipe arrangement with vibration or bending apparatus is used.

Electric Equipment in Explosive Gas Atmosphere hazardous area can be divided mainly into 1 area Zone and 2 area Zone, wherein 1st area Zone is the place that explosive gas atmosphere is likely to occur in normal operation；2 area Zone are in normal operation, it is impossible to gone out Existing explosive gas atmosphere, if there is being also occur once in a while and be only place that the short time is present.Major part is explosion-proof to scratch Suitable for the place of 2 area Zone, individual species are suitable for 1 area Zone places for property pipe.

Most of explosion-proof flexible pipe is typically suitable in the place of 2 area Zone on existing market, and this explosion-proof flexible pipe is at it It is explosion-proof usually as INCREASEDSAFETY in field, it is a kind of electrically to set to electric arc, spark under normal operating conditions will not be produced Standby to take some addition theretos to improve the type of explosion proof construc tion of its safe coefficient, it under normal operation not included in producing spark Or the equipment of electric arc.This traditional explosion-proof flexible pipe includes metal connecting tube and arranges the company at metal connecting tube two ends on market Connection device, auxiliary joint or coupling that the attachment means are connected including union joint and union joint, union joint part leads to Often weld or withhold with metal connecting tube.Simultaneously the mounting surface of union joint and auxiliary union joint is disposed as more smooth round nose Face, makes to fix contact sealing added with liner between both mounting surfaces by connectors such as nuts, thus does not deposit in blank area In explosion separation structure, this structural grouping is single, if blank area fixes the elasticity for contacting not enough or there is deviation on composition surface, easily There is connection gap and extend leakage electric spark etc., there is the electrical safety accident risk for causing electrical equipment hazardous area, this The explosion-proof flexible pipe of class lacks flame proof effect, is cannot to be used in 1st area as flame-proof type explosion-proof.

Utility model content

Therefore, the technical problems to be solved in the utility model is the connector portions for overcoming explosion-proof connecting tube of the prior art Point lacking flame proof is processed, and there is the technical problem of electrical equipment hazardous area security incident risk, a kind of has peace so as to provide Full flame proof effect, can prevent electric spark leakage, a kind of explosion-proof flexibility being used in electrical equipment hazardous area of safety and stability Connecting tube.

To solve above-mentioned technical problem, this utility model provides a kind of explosion-proof flexible connection pipe, including：

Connecting tube；

Nipple, is arranged on the two ends of the connecting tube, and the nipple is provided with along it away from one end of the connecting tube The connecting portion that length direction extends；

Coupling, one end fastening by attachment structure with the nipple away from the connecting tube is connected, the connection Portion's correspondence is extended through in the port cavity of the coupling, is formed to isolate extinguishing between the connecting portion and the coupling The flame proof gap of electric spark.

Used as a kind of preferred version, the flame proof gap is the clearance space being distributed along the exterior contour of the connecting portion, The cross-sectional length in the flame proof gap is 12.5~25 ㎜.

Used as a kind of preferred version, the connecting portion is to take shape on the end face of described nipple one end, with middle part sky The cylinder in chamber, end face diameter of the connecting portion diameter less than the nipple.

As a kind of preferred version, it is provided with to seal the flame proof between the coupling and the nipple end face The sealing member in gap.

Used as a kind of preferred version, the nipple is fixedly linked by trocar sheath with the connecting tube；The trocar sheath Convex thorn structure is provided with the inwall contacted with the connecting tube, the trocar sheath is by the convex thorn structure and the connection Pipe keeps firm contact.

Used as a kind of preferred version, the convex thorn structure is some equally distributed wedges.

As a kind of preferred version, external screw thread is provided with the nipple, the trocar sheath is near the nipple One end is provided with and is suitable to the screwed hole that described nipple one end is stretched into, and the trocar sheath and the nipple pass through the external screw thread Coordinate with screwed hole and be spirally connected.

Used as a kind of preferred version, the attachment structure includes the threaded portion on being arranged on the nipple and coupling, And the fastening assembly being threadedly connected on the threaded portion of the nipple and coupling.

Used as a kind of preferred version, the fastening assembly is at least one loose joint nut.

Used as a kind of preferred version, the connecting tube is metal hose or gum sleeve or plastic bushing.

The beneficial effects of the utility model：

(1), this utility model is provided in a kind of explosion-proof flexible connection pipe, and at the two ends of the connecting tube nipple is installed, The nipple is provided with the connecting portion for extending along its length away from one end of the connecting tube, by connecting portion correspondence In being extended through the port cavity of the coupling so that formed to isolate extinguishing electricity between the connecting portion and the coupling The flame proof gap of spark.Therefore, when the flame proof gap for having the electric spark for extending transmission to pass through this segment distance, the flame proof gap As a very narrow clearance space, and with the connecting portion development length identical cross-sectional length distance, by setting The electric spark total number that counting rational cross-sectional length and clearance distance can be transferred into herein is extinguished in flame proof gap, prevents electricity Spark leaks from connection gap.Efficiently solve blank area of the prior art and lack flame proof setting, it is impossible to which isolation is extinguished Electric spark leaks from the installation gap of union joint, there are the safety issues for causing electrical hazard place.Therefore, it is this Simple structure, it is safe and reliable, may be provided on the electrical line setting pipeline of electrical hazard place as with vibration or bending apparatus The safe handling of connecting line pipe arrangement, explosion-proof flexible connection pipe of the present utility model can be applied not only to 1st area as flame-proof type Zone, in can also being applied to 2 area Zone, the scope of application is wider, and security performance is more preferably, practical.

(2), this utility model is provided in a kind of explosion-proof flexible connection pipe, and the nipple is by trocar sheath and the connection Pipe is fixedly linked, and convex thorn structure is provided with the inwall that the trocar sheath contacts with the connecting tube, and the trocar sheath passes through The convex thorn structure keeps firm contact with the connecting tube.Specific embodiment is first by described nipple one end and connecting tube Socket keeps relative position to stablize, then when trocar sheath one end with it is interior connect one and be spirally connected after, the trocar sheath is withheld by force Mode make convex thorn structure division inwardly puncture into the sheath portion of connecting tube, so as to extrude the nipple portion in connecting tube that stretches into Point, make both strengthen firm grasping force, can prevent connecting tube stress from involving situation detached with nipple and occur, to ensure to connect The reliability for connecing, also eliminates the mode of traditional welding, meanwhile, this connected mode is applicable with all kinds of connecting tubes, for example may be used It is fastenedly connected with adopting to withhold with metal hose or gum sleeve or plastic bushing, will not have both damaged connecting tube, is had and be easy to operation And replacement, fixed, use range is wider, can be using in distinct device place, and beneficial to marketing, practical value is high.

(3), this utility model is provided in a kind of explosion-proof flexible connection pipe, and the coupling and nipple pass through attachment structure It is fixedly linked into a single integrated structure, consequently facilitating the installation of union joint part and stable connection.The attachment structure includes arranging Threaded portion on the nipple and coupling, and be threadedly connected to tight on the threaded portion of the nipple and coupling Gu component, the fastening assembly is at least one loose joint nut, wherein nipple and external can be covered after the fastening of loose joint nut The junction of head, this simple structure is convenient and fast connection, with locking effect, further improves to be connected with each other and stablizes Property.

Description of the drawings

In order to be illustrated more clearly that this utility model specific embodiment or technical scheme of the prior art, below will be right The accompanying drawing to be used needed for specific embodiment or description of the prior art is briefly described, it should be apparent that, describe below In accompanying drawing be some embodiments of the present utility model, for those of ordinary skill in the art, do not paying creativeness On the premise of work, can be with according to these other accompanying drawings of accompanying drawings acquisition.

The structural representation of a kind of explosion-proof flexible connection pipe that Fig. 1 is provided for this utility model；

Fig. 2 is the enlarged partial sectional view in the flame proof gap shown in Fig. 1；

Fig. 3 is the broken section structural representation of the nipple shown in Fig. 1；

The broken section structural representation of the trocar sheath that Fig. 4 is provided for this utility model, specifically shown convex thorn structure.

Description of reference numerals：

1- connecting tubes, 2- nipples, 21- connecting portions, 22- installation portions, 3- couplings, 4- flame proofs gap, 5- sealing members, 6- Trocar sheath, the convex thorn structures of 61-, 7- fastening assemblies.

Specific embodiment

The technical solution of the utility model is clearly and completely described below in conjunction with accompanying drawing, it is clear that described Embodiment is a part of embodiment of this utility model, rather than the embodiment of whole.Based on the embodiment in this utility model, this The every other embodiment that field those of ordinary skill is obtained under the premise of creative work is not made, belongs to this practicality Novel protected scope.

In description of the present utility model, it should be noted that term " " center ", " on ", D score, "left", "right", " perpendicular Directly ", the orientation or position relationship of the instruction such as " level ", " interior ", " outward " is, based on orientation shown in the drawings or position relationship, to be only For the ease of describe this utility model and simplify description, rather than indicate or imply indication device or element must have it is specific Orientation, with specific azimuth configuration and operation, therefore it is not intended that to restriction of the present utility model.Additionally, term " the One ", " second ", " the 3rd " are only used for describing purpose, and it is not intended that indicating or implying relative importance.

In description of the present utility model, it should be noted that unless otherwise clearly defined and limited, term " peace Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected, or be detachably connected, or integratedly Connection；Can be mechanically connected, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, It can be the connection of two element internals.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition Concrete meaning of the language in this utility model.

As long as additionally, technical characteristic involved in this utility model different embodiments disclosed below is each other Not constituting conflict just can be combined with each other.

Embodiment 1

This utility model provides a kind of explosion-proof flexible connection pipe as Figure 1-4, including connecting tube 1, nipple 2, outer Joint 3 and trocar sheath 6；Wherein, the nipple 2 is separately positioned on the two ends of the connecting tube 1, and the trocar sheath is arranged To strengthen both tightness at the link position of nipple and the connecting tube, the nipple 2 is away from the connecting tube 1 One end be provided with the connecting portion 21 for extending along its length；Further preferably, the coupling 3 by attachment structure with it is described Nipple 2 is connected away from one end fastening of the connecting tube, and the port that the correspondence of the connecting portion 21 is extended through the coupling 3 is empty In chamber, formed to isolate the flame proof gap 4 for extinguishing electric spark between the connecting portion 21 and the coupling 3.

Above-mentioned embodiment is the core technology scheme of the present embodiment, is extended through by the correspondence of the connecting portion 21 described outer In the port cavity of joint 3 so that formed to isolate between the connecting portion 21 and the coupling 3 extinguish electric spark every Quick-fried gap.Therefore, when the flame proof gap 4 for having the electric spark for extending transmission to pass through this segment distance, the flame proof gap 4 is used as one Individual narrow annular space, and with the development length identical length distance of the connecting portion 21, by length reasonable in design Degree and clearance distance can be transferred into electric spark total number herein and extinguish in flame proof gap 4, prevent electric spark from connecting sewing Leak in gap.Efficiently solve blank area of the prior art and lack flame proof setting, there is the peace for causing electrical hazard place The problem of full matters.Therefore, this simple structure, safe and reliable, may be provided at and make on the electrical line setting pipeline of electrical hazard place Be with vibration or bending apparatus connecting line pipe arrangement safe handling, explosion-proof flexible connection pipe of the present utility model can as every Quick-fried type is explosion-proof to can be applied not only to 1 area Zone, and in can also being applied to 2 area Zone, the scope of application is wider, and security performance is more preferable, It is practical.

Done further preferably according to above-mentioned embodiment, as shown in Fig. 2 the flame proof gap 4 is along the connecting portion 21 Exterior contour distribution clearance space, the annular space being specially formed between connecting portion and coupling port space or connect Conjunction face, certainly, the flame proof gap can also be the interstitial spaces or flameproof joint of arc or other shapes structure.It is described The cross-sectional length in flame proof gap 4 is 12.5-25mm, and the section is along the geometric cross section of nipple central axis section view；Enter one Step, the minimum spacing in the flame proof gap 4, i.e. the diameter difference in flame proof gap is 0.15~0.2mm, it is clear that the flame proof gap 4 spacing is little, cross-sectional length distance, is unfavorable for that electric spark etc. extends transmission, so as to reach the effect of flame proof process.In this reality In applying example, the connecting portion 21 is to take shape on the end face of the one end of the nipple 2, the cylinder with central cavity, wherein Cylinder diameter less than the nipple 2 end face diameter so that nipple circular end face it is remaining have with coupling matching connect Contact portion.It should be noted that the diameter of connecting portion 21 of the nipple 2 is adapted to extend in the port of coupling 3, pass through Attachment structure makes nipple 2 and coupling 3 maintain the connection, while both installation link positions fixed such that it is able to protect Demonstrate,prove the flame proof gap to exist.

As shown in figure 1, in order to strengthen nipple and coupling connection sealing and fiting effect, the coupling 3 with The sealing member 5 for sealing the flame proof gap is provided between the end face of the nipple 2, the sealing ring is located at nipple In the contact portion that circular end face connects with coupling matching, the sealing member 5 is preferably lead gasket (in combustible dust field It is rubber washer when used).

As one kind preferred embodiment, the nipple 2 is fixedly linked by trocar sheath 6 with the connecting tube 1.Institute State and convex thorn structure 61 is provided with the inwall that trocar sheath 6 contacts with the connecting tube 1, the trocar sheath 6 is by the convex thorn Structure 61 keeps firm contact with the connecting tube 1.Such as a kind of set-up mode of Fig. 4, the convex thorn structure 61 is some uniform The wedge of distribution, can prevent it from releasing the grasping force for connecting outer tube layer by wedge, bear the moments of torsion such as tension bigger.

Further preferably, external screw thread is provided with the nipple 2, the trocar sheath 6 is near one end of the nipple 2 Be provided with and be suitable to the screwed hole that described nipple one end is stretched into, the trocar sheath 6 and the nipple 2 by the external screw thread with Screwed hole cooperation is spirally connected.Summary embodiment, it should be noted that the nipple 2 include one section to the company The installation portion 22 of contact is installed in adapter 1, and its installation portion 22 is adapted to be attached in one end of the connecting tube 1.Specifically, by described The one end of nipple 2 keeps relative position to stablize with the socket of connecting tube 1, after being then spirally connected by the one end of trocar sheath 6 and nipple, leads to Crossing force and withholding the mode of the trocar sheath 6 makes the convex thorn portion extrusion of structure 61 puncture into the sheath portion of connecting tube 1, so as to squeeze Pressure stretch enters the installation portion of nipple 2 in connecting tube 1, makes both strengthen firm grasping force, can prevent the stress of connecting tube 1 involve with The detached situation of nipple 2 occurs, and with the reliability for ensureing to connect, also eliminates the mode of traditional welding, easy to operate.

Optional embodiment a kind of, the connecting tube 1 is metal hose or gum sleeve or plastic bushing.This reality In applying example, above-mentioned trocar sheath 1 to withhold connected mode applicable with all kinds of connecting tubes, for example can be with metal hose or rubber sleeve Pipe or plastic bushing are adopted to withhold and are fastenedly connected, and will not both damage connecting tube, are easy to operate and change again, fixed, are suitable for Face is wider, can be using in distinct device place, and beneficial to marketing, practical value is high.

As shown in figure 1, the attachment structure includes the threaded portion being arranged on the nipple 2 and coupling 3, the spiral shell Stricture of vagina portion is preferably and arranges external screw thread on the nipple 2 and the link position of coupling 3, and is threadedly connected to the nipple 2 With the fastening assembly 7 on the threaded portion of coupling, it is preferred that the fastening assembly 7 is at least one loose joint nut, so as to basis Actual connection adjusts tightening state.This structure setting, the coupling 3 and nipple 2 pass through attachment structure fixing phase Be connected structure, consequently facilitating the installation of union joint part, strengthens stable connection.Wherein can cover after the fastening of loose joint nut The firmly junction of nipple and coupling, simple structure is convenient and fast connection, with locking effect, further improves phase Connect stability.

Obviously, above-described embodiment is only intended to clearly illustrate example, and not to the restriction of embodiment.It is right For those of ordinary skill in the art, can also make on the basis of the above description other multi-forms change or Change.There is no need to be exhaustive to all of embodiment.And the obvious change thus extended out or Among changing the protection domain created still in this utility model.

Claims (10)

1. a kind of explosion-proof flexible connection pipe, it is characterised in that include：

Connecting tube (1)；

Nipple (2), is arranged on the two ends of the connecting tube (1), the one end of the nipple (2) away from the connecting tube (1) It is provided with the connecting portion (21) for extending along its length；

Coupling (3), one end fastening by attachment structure with the nipple (2) away from the connecting tube is connected, the company Socket part (21) correspondence is extended through in the port cavity of the coupling (3), between the connecting portion (21) and the coupling (3) Formed to isolate the flame proof gap (4) for extinguishing electric spark.

2. a kind of explosion-proof flexible connection pipe according to claim 1, it is characterised in that：

The flame proof gap (4) be along the connecting portion (21) exterior contour be distributed clearance space, the flame proof gap (4) Cross-sectional length be 12.5~25 ㎜.

3. a kind of explosion-proof flexible connection pipe according to claim 1, it is characterised in that：

The connecting portion (21) on the end face for taking shape in the nipple (2) one end, the cylinder with central cavity, it is described End face diameter of connecting portion (21) diameter less than the nipple (2).

4. a kind of explosion-proof flexible connection pipe according to claim 3, it is characterised in that：

The sealing member for sealing the flame proof gap is provided between the coupling (3) and the nipple (2) end face (5)。

5. a kind of explosion-proof flexible connection pipe according to claim 1, it is characterised in that：

The nipple (2) is fixedly linked by trocar sheath (6) with the connecting tube (1)；The trocar sheath (6) and the connection Be provided with convex thorn structure (61) on pipe (1) inwall that contacts, the trocar sheath (6) by convex thorn structure (61) with it is described Connecting tube (1) keeps firm contact.

6. a kind of explosion-proof flexible connection pipe according to claim 5, it is characterised in that：Convex thorn structure (61) is some Equally distributed wedge.

7. a kind of explosion-proof flexible connection pipe according to claim 5, it is characterised in that：It is provided with the nipple (2) External screw thread, the trocar sheath (6) is provided near one end of the nipple (2) and is suitable to the screw thread that described nipple one end is stretched into Hole, the trocar sheath (6) and the nipple (2) are spirally connected by the external screw thread with screwed hole cooperation.

8. a kind of explosion-proof flexible connection pipe according to claim 1, it is characterised in that：

The attachment structure includes the threaded portion being arranged on the nipple (2) and coupling (3), and is threadedly connected to institute State nipple (2) and the fastening assembly (7) on the threaded portion of coupling.

9. a kind of explosion-proof flexible connection pipe according to claim 7, it is characterised in that：

The fastening assembly (7) is at least one loose joint nut.

10. a kind of explosion-proof flexible connection pipe according to claim 1, it is characterised in that：

The connecting tube (1) is metal hose or gum sleeve or plastic bushing.