CN206274064U - Screw nut driving pair and insulin pump - Google Patents

Abstract

The utility model is applied to Micro Medical Apparatus and Technology field, there is provided a kind of screw nut driving pair and with the secondary insulin pump of the screw nut driving, the screw nut driving is secondary to include the nut of screw mandrel and ring set on screw mandrel, screw mandrel receives that rotation occurs from outside moment of torsion, and promotes nut to be moved along a straight line by the screw thread pair with nut screw connection.The screw nut driving pair that the utility model is provided sets first boss in external screw thread near the end of back-up ring, and second boss is set near externally threaded end face on back-up ring.When back-up ring end face and externally threaded distal end faces will be contacted, the side of first boss can keep out in the side of second boss so that screw mandrel cannot opposing nut be rotated further, when reversely promoting nut so as to avoid screw mandrel, due to the effect of frictional force, screw mandrel and nut cannot be relatively rotated, and stuck phenomenon occur.

Description

Screw nut driving pair and insulin pump

Technical field

The utility model belongs to Micro Medical Apparatus and Technology field, more particularly to a kind of screw nut driving is secondary and has The secondary insulin pump of the screw nut driving.

Background technology

Screw nut driving pair is a kind of common mechanism for converting rotational motion into straight reciprocating motion, with position control The advantages of system is accurate, backhaul difference is small, there is application widely in the mini-medical apparatus such as insulin pump.

In the prior art, it is to set external screw thread in one end of screw mandrel to have a class screw nut driving pair, is set on nut Internal thread, screw mandrel promotes nut to be moved along a straight line by screw thread pair.During in order to prevent nut from being moved out along screw mandrel, depart from silk Bar, typically sets back-up ring on nut end face.When nut is close to the position for departing from screw mandrel, externally threaded end end on screw mandrel Face can be supported on back-up ring end face so that screw mandrel cannot continue opposing nut rotation, and nut is no longer moved out, so as to avoid Nut departs from screw mandrel.

But, back-up ring end face is kept out behind male end face, if stopping screw mandrel rotation not in time, can be twisted screw mandrel and nut Tightly, there is self-locking in screw thread pair so that the region of external screw thread and internal thread engagement forms very big frictional force, then by rotary screw During drive nut counter motion, due to the frictional force that self-locking is produced, cause screw mandrel and nut to relatively rotate, card easily occur Dead phenomenon.

Utility model content

The purpose of this utility model is to provide a kind of spindle gear, it is intended to solve screw rod transmission dress in the prior art Put and be susceptible to stuck technical problem.

The utility model is achieved in that a kind of screw nut driving pair, including with externally threaded screw mandrel, be set in Nut on the screw mandrel and the back-up ring being fixed on the nut end face, the screw mandrel are included for receiving external torque With the force side for being rotated and the external screw thread and the force side for promoting nut motion are provided with, the nut sets Have for the through hole of screw mandrel insertion and positioned at the through-hole wall and the internal thread that is engaged with the external screw thread, the gear Ring be placed on the screw mandrel and be fixed on the nut on the end face of the force side, the back-up ring and the through hole Accommodation space is formed, the external screw thread is contained in the accommodation space；Characterized in that, the screw mandrel also includes being based in it First boss on outer surface, the first boss be located at the external screw thread near the end of the back-up ring and towards the gear Circle direction is raised, and the back-up ring is provided with towards the raised second boss of the external screw thread, institute towards the externally threaded end face The side wall for stating first boss keeps out the side wall in the second boss to prevent the screw mandrel relative to the nut rotation.

Further, it is fixedly installed end cap away from described externally threaded one end on the screw mandrel, the end cap is towards institute State and the 3rd raised boss of the back-up ring is provided with the end face of back-up ring, the back-up ring is provided with towards the end face of the end cap Towards the 4th boss that the end cap is raised, the side wall of the 4th boss can keep out the side wall in the 3rd boss to hinder Only the end cap is relative to the nut rotation.

Further, the guide rail extended along its axial direction, the feed screw nut are convexly equipped with the periphery of the nut Transmission also includes in stationary state and is sheathed on the sleeve pipe of the nut, and described sleeve pipe inwall is provided with and prolongs along its axial direction Stretch and the gathering sill for guide rail insertion to prevent the nut from being rotated relative to described sleeve pipe.

Further, the guide rail includes the first guide rail and the second guide rail set with first guide rail parallel, described First guide rail extends towards the back-up ring and protrudes from the back-up ring end face and forms the 4th boss.

Further, the end face in described sleeve pipe near the force side is provided with mounting disc, and the mounting disc is along described Sleeve pipe radial direction stretches out and for described sleeve pipe to be fixed.

Further, the end face of the mounting disc is provided with the first deep gouge for housing the end cap.

Further, the end cap is provided with the D type mesopores with the first mounting surface, and the screw mandrel is away from the external screw thread One end be provided with step surface, the step surface include with the second mounting surface of the screw mandrel diameter parallel and with the screw axis The 3rd vertical mounting surface of line, the end cap is located on the screw mandrel and first mounting surface is close to described second and is installed Face is rotated with preventing the end cap relative to the screw mandrel.

Further, the back-up ring is shaped in the end face of the nut.

Further, the nut is provided with the second deep gouge near the end face of the back-up ring, and the back-up ring is embedded in described the In two deep gouges.

Further, the back-up ring periphery is provided with the projection that radially direction stretches out, and the nut side wall sets There is the breach to prevent the back-up ring from being rotated relative to the nut for projection insertion.

The utility model additionally provides a kind of insulin pump, and the insulin pump includes above-mentioned screw nut driving pair.

The utility model has the technical effect that relative to prior art：The secondary bag of screw nut driving that the utility model is provided Include the nut of screw mandrel and ring set on screw mandrel, screw mandrel receives that rotation occurs from outside moment of torsion, and by with nut screw connection Screw thread pair promotes nut to be moved along a straight line.The screw nut driving pair that the utility model is provided is in external screw thread near the end of back-up ring End sets first boss, and second boss is set near externally threaded end face on back-up ring.When screw mandrel promotes nut to be displaced outwardly, Back-up ring is close to externally threaded distal end faces, and now second boss is also moved to first boss, when back-up ring end face and external screw thread Distal end faces when will contact, the side of first boss can be kept out in the side of second boss so that screw mandrel cannot opposing nut It is rotated further, after avoiding back-up ring end face and the contact of externally threaded distal end faces, due to squeezing action, screw thread pair occurs certainly Lock, when causing screw mandrel to promote nut counter motion, due to the effect of frictional force, screw mandrel and nut cannot be relatively rotated, and card occur Dead phenomenon.

Brief description of the drawings

In order to illustrate more clearly of the technical scheme of the utility model embodiment, below will to the utility model embodiment or The accompanying drawing to be used needed for description of the prior art is briefly described, it should be apparent that, drawings described below is only Some embodiments of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, Other accompanying drawings can also be obtained according to these accompanying drawings.

Fig. 1 is the stereogram of the screw nut driving pair that the utility model embodiment is provided；

Fig. 2 is the stereogram of the screw mandrel that the utility model embodiment is provided；

Fig. 3 is the sectional view of the feed screw nut that the utility model embodiment is provided；

Fig. 4 is the enlarged drawing of a-quadrant in Fig. 3；

Fig. 5 is the exploded view of the screw nut driving pair that the utility model embodiment is provided；

Fig. 6 is the exploded view of the second preferred embodiment；

Fig. 7 is the stereogram of the second preferred embodiment；

Description of reference numerals：

10	Screw mandrel	25	Breach
				11	Force side	30	Back-up ring
12	Force side	31	Second boss
				13	External screw thread	32	4th boss
14	First boss	33	Projection
				15	Step surface	40	Accommodation space
151	Second mounting surface	50	End cap
				152	3rd mounting surface	51	3rd boss
20	Nut	52	D type mesopores
				21	Through hole	521	First mounting surface
22	Internal thread	60	Sleeve pipe
				23	Guide rail	61	Gathering sill
231	First guide rail	62	Mounting disc
				232	Second guide rail	621	First deep gouge
24	Second deep gouge

Specific embodiment

Embodiment of the present utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein ad initio Same or similar element or element with same or like function are represented to same or similar label eventually.Below by ginseng The embodiment for examining Description of Drawings is exemplary, it is intended to for explaining the utility model, and it is not intended that to the utility model Limitation.

In description of the present utility model, it is to be understood that term " length ", " width ", " on ", D score, " preceding ", " afterwards ", the orientation or position relationship of the instruction such as "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outward " are based on attached The shown orientation of figure or position relationship, are for only for ease of and describe the utility model and simplify to describe, rather than instruction or hint Signified device or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to this The limitation of utility model.

Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or Implicitly include one or more this feature.In description of the present utility model, " multiple " is meant that two or two More than, unless otherwise expressly limited specifically.

In the utility model, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " Gu It is fixed " etc. term should be interpreted broadly, for example, it may be fixedly connected, or be detachably connected, or integrally；Can be Mechanically connect, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, can be two The connection of element internal or two interaction relationships of element.For the ordinary skill in the art, can basis Concrete condition understands concrete meaning of the above-mentioned term in the utility model.

In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and implementation Example, is further elaborated to the utility model.

Fig. 1 to Fig. 3 is referred to, the screw nut driving that the utility model embodiment is provided is secondary to include thering is external screw thread 13 Screw mandrel 10, the nut 20 being set on the screw mandrel 10 and the back-up ring 30 being fixed on the end face of the nut 20, the silk Bar 10 is included for receiving external torque with the force side 11 that is rotated and being provided with the external screw thread 13 and for promoting The force side 12 of the motion of nut 20 is stated, the nut 20 is provided with for the through hole 21 of the screw mandrel 10 insertion and positioned at the through hole 21 inwalls and the internal thread 22 being engaged with the external screw thread 13, the back-up ring 30 are located on the screw mandrel 10 and are fixed on institute Being close on the end face of the force side 11 for nut 20 is stated, the back-up ring 30 and the through hole 21 form accommodation space 40, described External screw thread 13 is contained in the accommodation space 40；Characterized in that, the screw mandrel 10 also includes being based on its outer surface First boss 14, the first boss 14 be located at the external screw thread 13 near the end of the back-up ring 30 and towards the back-up ring 30 directions are raised, and the back-up ring 30 is provided with towards the second convex of the projection of the external screw thread 13 towards the end face of the external screw thread 13 Platform 31, the side wall of the first boss 14 keeps out the side wall in the second boss 31 to prevent the screw mandrel 10 relative to described Nut 20 is rotated.

Fig. 1 to Fig. 3 is referred to, the screw nut driving that the utility model is provided is secondary to include screw mandrel 10 and ring set in screw mandrel 10 On nut 20, screw mandrel 10 receives that rotation, and the screw thread pair promotion spiral shell by coordinating with nut 20 occur from outside moment of torsion Female 20 are moved along a straight line.The screw nut driving pair that the utility model is provided is set in external screw thread 13 near the end of back-up ring 30 First boss 14, the end face near external screw thread 13 on back-up ring 30 sets second boss 31.In the rotation forces nut 20 of screw mandrel 10 When being displaced outwardly, back-up ring 30 is close to the distal end faces of external screw thread 13, and now second boss 31 is also moved to first boss 14, When the distal end faces of the end face of back-up ring 30 and external screw thread 13 will be contacted, the side of first boss 14 can be kept out in second boss 31 Side cause screw mandrel 10 cannot opposing nut 20 be rotated further, so as to avoid the end end of the end face of back-up ring 30 and external screw thread 13 After the contact of face, due to squeezing action, there is self-locking in screw thread pair, when causing screw mandrel 10 to promote 20 counter motion of nut, due to friction The effect of power, screw mandrel 10 and nut 20 cannot be relatively rotated, and stuck phenomenon occur.

Fig. 2, Fig. 3 and Fig. 5 are referred to, further, the one end on the screw mandrel 10 away from the external screw thread 13 is fixed and set It is equipped with end cap 50, the end cap 50 is towards the 3rd boss that the projection of the back-up ring 30 is provided with the end face of the back-up ring 30 51, the back-up ring 30 is towards the 4th boss 32 that the projection of the end cap 50 is provided with the end face of the end cap 50, described The side wall of four boss 32 can keep out the side wall in the 3rd boss 51 to prevent the end cap 50 relative to the nut 20 Rotate.Specifically, when screw mandrel 10 rotarily drives nut 20 to be moved to the direction near the force side 11, it is possible to understand that, Now second boss 31 is gradually distance from first boss 14, and the 4th boss 32 is close to near the 3rd boss 51, when back-up ring 30 will When being contacted with end cap 50, the 3rd boss 51 can keep out the side wall in the 4th boss 32 so that screw mandrel 10 stops operating.This practicality is new The screw nut driving pair that type embodiment is provided was kept out before the end contact of end cap 50 and back-up ring 30 by the 4th boss 32 3rd boss 51 causes that screw mandrel 10 stops operating, and then cause nut 20 no longer as the direction of end cap 50 is moved, it is to avoid end cap 50 End face is extruded with the end face of back-up ring 30, causes the self-locking of nut 20, and the stuck problem of feed screw nut pair occurs.The utility model reality Feed screw nut pair the keeping out and the 3rd boss 51 and the 4th boss by first boss 14 and second boss 31 of example offer is provided 32 keep out to limit the stroke of nut 20 so that nut 20 will not occur stuck in two ends of stroke.

Fig. 5 is referred to, further, the guide rail extended along its axial direction is convexly equipped with the periphery of the nut 20 23, the secondary sleeve pipe 60 for also including in stationary state and being sheathed on the nut 20 of the screw nut driving, described sleeve pipe 60 Inwall is provided with and extend along its axial direction and inserted for the guide rail 23 to prevent the nut 20 with respect to 60 turns of described sleeve pipe Dynamic gathering sill 61.Sleeve pipe 60 can be fixed by any-mode, in the plug-in-sleeve 60 of nut 20, and be covered by the way that guide rail 23 is relative Pipe 60 is slided.It should be understood that the Main Function of sleeve pipe 60 is to prevent nut 20 from rotating and to the linear motion of nut 20 Guide effect is provided, the present embodiment allows that screw nut driving pair realizes the function of pushing tow exterior object.

Fig. 5 is referred to, further, the guide rail 23 includes the first guide rail 231 and parallel with first guide rail 231 sets The second guide rail 232 put, first guide rail 231 extends towards the back-up ring 30 and protrudes from the end face of the back-up ring 30 formation institute State the 4th boss 32.The feed screw nut pair that the utility model embodiment is provided is parallel by the periphery setting two in nut 20 Guide rail 23 so that it bears bigger moment of torsion, improves the secondary reliability of screw nut driving.In addition, the 4th boss 32 leads to Cross the mode for extending protrusion by guide rail 23 to be formed, reduce difficulty of processing.Also, due to the work in screw nut driving subtask Cheng Zhong, the 4th boss 32 often can collide with the 3rd boss 51, therefore use makes with the integrally formed mode of guide rail 23 4th boss 32 so that its intensity is higher, extends the secondary service life of screw nut driving.

Fig. 1 and Fig. 5 is referred to, further, the end face in described sleeve pipe 60 near the force side 11 is provided with installation Disk 62, the mounting disc 62 stretches out and along the radial direction of described sleeve pipe 60 for described sleeve pipe 60 to be fixed.The installation The end face of disk 62 is provided with the first deep gouge 621 for housing the end cap 50.Because end cap 50 is fixedly mounted with screw mandrel 10, end Lid 50 is rotated with screw mandrel 10, therefore, the screw nut driving adjutant end cap 50 that the utility model embodiment is provided is housed In the first deep gouge 621, during can preventing end cap 50 from rotating, periphery object is touched, security incident occurs.

Fig. 2 is referred to, further, the end cap 50 is provided with the D types mesopore 52 with the first mounting surface 521, described Screw mandrel 10 is provided with step surface 15 away from one end of the external screw thread 13, and the step surface 15 includes and the diameter parallel of the screw mandrel 10 The second mounting surface 151 and threeth mounting surface 152 vertical with the axis of the screw mandrel 10, the end cap 50 is located on the silk On bar 10 and first mounting surface 521 is close to second mounting surface 151 to prevent the relatively described screw mandrel of the end cap 50 10 rotate.The utility model embodiment is fixed end cap 50 with screw mandrel 10 using the D types mesopore 52 on end cap 50, simple structure, After processing cost is low, and end cap 50 is fixed on screw mandrel 10, the first mounting surface 521 is close to the second mounting surface 151, is hindered with this Not-go-end lid 50 is relatively rotated with screw mandrel 10, and reliability is more preferably.

Fig. 3 and Fig. 4 is referred to, back-up ring 30 and the first preferred embodiment of the fixed form of nut 20 that the utility model is provided For：The back-up ring 30 is shaped in the end face of the nut 20.Due to during the use of feed screw nut pair, second boss 31 often can collide with first boss 14, therefore, the fixation of back-up ring 30 and nut 20 must be very firm.And the present embodiment Back-up ring 30 and nut 20 using being integrally formed fixation, back-up ring 30 and nut 20 form as one, fixed reliable, can extend silk The service life of stem nut transmission.

Fig. 6 and Fig. 7 is referred to, back-up ring 30 and the second preferred embodiment of the fixed form of nut 20 that the utility model is provided For：The nut 20 is provided with the second deep gouge 24 near the end face of the back-up ring 30, and the back-up ring 30 is embedded in second deep gouge In 24.In the first embodiment, due to being provided with second boss 31 on back-up ring 30, therefore, during using injection moulding, while shaping The difficulty for going out second boss 31 is larger, therefore, screw nut driving adjutant back-up ring 30 and spiral shell that the utility model embodiment is provided Female 20 are set to two elements, can process respectively, are then assembled, so as to reduce difficulty of processing.

Fig. 6 and Fig. 7 is referred to, further, it is convex that the periphery of the back-up ring 30 is provided with that radially direction stretches out Block 33, the side wall of the nut 20 is provided with and inserts to prevent the back-up ring 30 relative to lacking that the nut 20 rotates for the projection 33 Mouth 25.After back-up ring 30 is inlaid into the second deep gouge 24, in order to prevent screw nut driving pair during long-time use, keep off Circle 30 is rotated under the percussion of first boss 14.Therefore, the present embodiment sets projection 33 in the periphery of back-up ring 30, will be convex Breach 25 on the insertion nut 20 of block 33, above-mentioned situation is prevented with this.

The utility model additionally provides a kind of insulin pump, and the insulin pump includes above-mentioned screw nut driving pair.It is described Screw nut driving pair is secondary with above-mentioned screw nut driving to have identical structure, and role is identical, does not repeat herein.

Preferred embodiment of the present utility model is the foregoing is only, is not used to limit the utility model, it is all at this Any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model Protection domain within.

Claims (10)

1. a kind of screw nut driving pair, including with externally threaded screw mandrel, the nut being set on the screw mandrel and fixation Back-up ring on the nut end face, the screw mandrel is included for receiving external torque with the force side that is rotated and setting Have the external screw thread and a force side for promoting nut motion, the nut be provided with through hole for screw mandrel insertion with And positioned at the through-hole wall and the internal thread that is engaged with the external screw thread, the back-up ring is located on the screw mandrel and fixed In the nut on the end face of the force side, the back-up ring forms accommodation space, the external screw thread with the through hole It is contained in the accommodation space；Characterized in that, the screw mandrel also includes the first boss being based on its outer surface, it is described First boss is located at the near the end of the back-up ring and raised towards the back-up ring direction of the external screw thread, the back-up ring towards The externally threaded end face is provided with towards the raised second boss of the external screw thread, and the side wall of the first boss is kept out in institute The side wall of second boss is stated to prevent the screw mandrel relative to the nut rotation.

2. screw nut driving pair as claimed in claim 1, it is characterised in that away from described externally threaded on the screw mandrel End is fixedly installed end cap, the end cap towards being provided with the 3rd raised boss of the back-up ring on the end face of the back-up ring, The back-up ring is towards being provided with the 4th raised boss of the end cap, the side wall of the 4th boss on the end face of the end cap The side wall in the 3rd boss can be kept out to prevent the end cap relative to the nut rotation.

3. screw nut driving pair as claimed in claim 2, it is characterised in that be convexly equipped with along it on the periphery of the nut The guide rail that axial direction extends, the secondary set for also including in stationary state and being sheathed on the nut of the screw nut driving Pipe, described sleeve pipe inwall is provided with and extend along its axial direction and for guide rail insertion to prevent the relatively described set of the nut The gathering sill that pipe is rotated.

4. screw nut driving pair as claimed in claim 3, it is characterised in that the guide rail include the first guide rail and with it is described The second guide rail that first guide rail parallel is set, first guide rail extends towards the back-up ring and protrudes from the back-up ring end face shape Into the 4th boss.

5. screw nut driving pair as claimed in claim 3, it is characterised in that near the one of the force side in described sleeve pipe End face is provided with mounting disc, and the mounting disc stretches out and along described sleeve pipe radial direction for described sleeve pipe to be fixed.

6. screw nut driving pair as claimed in claim 2, it is characterised in that the end cap is provided with the first mounting surface D type mesopores, the screw mandrel is provided with step surface away from described externally threaded one end, and the step surface includes and the screw mandrel axis Parallel the second mounting surface and threeth mounting surface vertical with the screw mandrel axis, the end cap is located on the screw mandrel simultaneously And first mounting surface is close to second mounting surface to prevent the end cap from being rotated relative to the screw mandrel.

7. screw nut driving pair as claimed in any one of claims 1 to 6, it is characterised in that the back-up ring is shaped in The end face of the nut.

8. screw nut driving pair as claimed in any one of claims 1 to 6, it is characterised in that the nut is near the gear The end face of circle is provided with the second deep gouge, and the back-up ring is embedded in second deep gouge.

9. screw nut driving pair as claimed in claim 8, it is characterised in that the back-up ring periphery is provided with radially side To the projection for stretching out, nut side wall is provided with for projection insertion to prevent the back-up ring from being rotated relative to the nut Breach.

10. a kind of insulin pump, it is characterised in that including the screw nut driving pair as described in claim 1-9 any one.