CN212166260U - Medicine injector - Google Patents
Medicine injector Download PDFInfo
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- CN212166260U CN212166260U CN201921949915.1U CN201921949915U CN212166260U CN 212166260 U CN212166260 U CN 212166260U CN 201921949915 U CN201921949915 U CN 201921949915U CN 212166260 U CN212166260 U CN 212166260U
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Abstract
The utility model provides a medicine injector which comprises a shell, a transmission gear set and a pushing component, wherein a transmission space and a medicine placing space are arranged in the shell, a baffle wall is arranged between the transmission space and the medicine placing space, and a connecting through hole is arranged on the baffle wall; the transmission gear group is arranged in the transmission space, and the pushing assembly is arranged in the medicine placing space; the transmission gear set comprises an output gear, the pushing assembly comprises a screw rod, the screw rod passes through the connecting through hole, and the screw rod is detachably and coaxially connected with the output gear; the screw rod is provided with a shaft shoulder part, and the shaft shoulder part is limited between the retaining wall and the output gear in the axial direction. When carrying out the assembly of medical injector, pass the connecting through hole with the lead screw and wear out the medicine and place the space, install drive gear set again afterwards, the shaft shoulder is spacing between fender wall and output gear this moment, when the installation that promotes the subassembly or use medical injector, can not lead to the swing because of lead screw axial position's unstability, reduces the assembly degree of difficulty and improves the injection precision.
Description
Technical Field
The utility model relates to the technical field of medical equipment, concretely relates to medicine injector.
Background
The existing medicine injector for insulin injection comprises a shell, a power supply, a motor, a transmission gear set and a pushing assembly, wherein the power supply, the motor, the transmission gear set and the pushing assembly are arranged in the shell; the shell is internally provided with a transmission space and a medicine placing space, the shell is provided with a blocking wall which is blocked between the transmission space and the medicine placing space, the blocking wall is provided with a connecting through hole which is communicated between the transmission space and the medicine placing space, the transmission gear set is arranged in the transmission space, the pushing assembly is arranged in the medicine placing space, and the screw rod penetrates through the connecting through hole and is inserted into an output gear of the transmission gear set.
When the medicine injector is assembled, the transmission gear set is installed in the transmission space, then the screw rod penetrates through the connecting through hole from the medicine placing space and is inserted into the output gear, and then the pushing piece is installed on the screw rod.
The existing medicine injector has the problems that when a pushing piece is installed, the axial position of a screw rod cannot be fixed, the screw rod generates axial displacement when the pushing piece is selected, and then the screw rod swings and loosens, so that the assembly difficulty is increased; in addition, when the medical injector is in use, the screw rod also swings due to the instability of the axial position, and the injection precision is affected.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a reduce the assembly degree of difficulty, improve the medicine syringe of injection precision.
The utility model provides a medicine injector which comprises a shell, a transmission gear set and a pushing component, wherein the shell is internally provided with a transmission space and a medicine placing space, the shell is provided with a baffle wall which is blocked between the transmission space and the medicine placing space, and the baffle wall is provided with a connecting through hole which is communicated between the transmission space and the medicine placing space; the transmission gear set is arranged in the transmission space, and the pushing assembly is arranged in the medicine placing space; the transmission gear set comprises an output gear, the pushing assembly comprises a screw rod, the screw rod passes through the connecting through hole, and the screw rod is detachably and coaxially connected with the output gear; the screw rod is provided with a shaft shoulder part, and the shaft shoulder part is limited between the retaining wall and the output gear in the axial direction of the screw rod.
It can be seen by above-mentioned scheme that when carrying out the assembly of medicine syringe, regard as the originated with the transmission space, pass the connecting hole and wear out the medicine earlier and place the space, install transmission gear set afterwards, the shaft shoulder is spacing between fender wall and output gear this moment, when carrying out the installation that promotes the subassembly or using the medicine syringe, all can not lead to the swing because of the unstability of lead screw axial position, reduces the assembly degree of difficulty and improves the injection precision.
A step position axially communicated with the connecting through hole is formed on the retaining wall, and a step surface facing the output gear is formed between the step position and the connecting through hole; the shaft shoulder part is positioned in the step position and is limited between the step surface and the output gear.
Therefore, the step position is used for accommodating the shaft shoulder, the arrangement of the transmission space and the arrangement of the transmission gear set are not influenced too much due to the arrangement of the step position, and the design difficulty is reduced.
Further, the output gear comprises a first gear segment; the first gear section is positioned in the step position, the outer peripheral surface of the first gear section is matched with the inner peripheral surface of the step position, and the shaft shoulder is limited between the step surface and the end surface of the first gear section; the second gear section is in limit fit with the retaining wall in the axial direction.
As can be seen, this arrangement allows the shaft shoulder to be further axially restrained and the rotation of the output gear to be more stable.
The further scheme is that the output gear comprises a first gear section, a second gear section and a third gear section which are sequentially connected along the axial direction, the gear teeth are arranged on the third gear section, the outer diameters of the first gear section, the second gear section and the third gear section are sequentially increased, and the second gear section is in limit fit with the retaining wall in the axial direction.
Therefore, under the axial matching of the second gear section and the blocking wall, a fixed space is formed between the axial end face of the first gear section and the step face to accommodate the shaft shoulder part, the size of the space is not influenced by the rotation of the output gear, and the axial position of the screw rod is more stable; in addition, in the axial direction, the contact area between the output gear and the blocking wall is smaller, and the rotation of the output gear is smoother.
The screw rod further comprises a rotation matching part, the rotation matching part is positioned in the connecting through hole, and the rotation matching part is in rotation matching with the blocking wall.
From top to bottom, the setting of normal running fit portion increases the rotational stability of lead screw.
The medicine injector further comprises a sealing ring, and the sealing ring is arranged between the rotating matching part and the inner circumferential surface of the connecting through hole.
In a further scheme, an annular groove is formed in the periphery of the rotation matching part, and the sealing ring is located in the annular groove.
Therefore, the sealing ring is arranged to ensure the oil tightness of the transmission space.
The further proposal is that the axial end part of the screw rod is provided with an inserting bulge, and the periphery of the inserting bulge is provided with at least one edge; the output gear is provided with an inserting concave position, and the inner peripheral outline of the inserting concave position is matched with the outer peripheral outline of the inserting bulge; the inserting projection is inserted in the inserting concave position.
As can be seen, this arrangement ensures effective transmission between the screw and the output gear.
In a further scheme, the inserting projection is in a linear shape in the axial projection.
From top to bottom, the concave-convex structure of contrast polygon, "a" style of calligraphy is more wear-resisting, and the medicine syringe is more durable.
In a further scheme, the extending tail end of the inserting projection is provided with a guide inclined surface in the axial direction.
Therefore, the arrangement further reduces the difficulty in inserting the screw rod and the output gear.
Drawings
Fig. 1 is a sectional view of an embodiment of a medical injector according to the present invention.
Fig. 2 is an exploded view of the second housing, the transmission gear set and the lead screw according to the embodiment of the medical injector of the present invention.
Fig. 3 is a partially enlarged view of a portion a in fig. 1.
Figure 4 is a cross-sectional view of the first housing in an embodiment of the medical injector of the present invention.
Fig. 5 is a diagram of a first operating state of a pushing assembly in an embodiment of a medical injector according to the present invention.
Fig. 6 is a diagram of a second operating state of the pushing assembly in the embodiment of the medical injector of the present invention.
Detailed Description
Referring to fig. 1, fig. 1 is a sectional view of an embodiment of a medical injector according to the present invention. The utility model provides a medicine injector, including shell 1, end cover 2, motor 3, drive gear group 4 and promotion subassembly 5, shell 1 is including dismantling continuous first casing 11 and second casing 12 each other, has the medicine in the first casing 11 and places space 101, has transmission space 102 in the second casing 12, has on the second casing 12 and keeps off wall 121, and after first casing 11 and second casing 12 interconnect, keep off wall 121 and block between transmission space 102 and medicine place space 101.
A placing inlet 119 is arranged on the first end 101a of the medicine placing space 101 extending in the axial direction, and the end cover 2 with the needle body 21 is covered on the placing inlet 119; the axially extending second end 101b of the medication placing space 101 is where the stop wall 121 is located. The motor 3, the transmission gear set 4 and the pushing assembly 5 are all arranged in the housing 1, the transmission gear set 4 is arranged in the transmission space 102, and the pushing assembly 5 is arranged in the medicine placing space 101.
Referring to fig. 2 and 3, fig. 2 is an exploded view of a second housing, a transmission gear set and a lead screw according to an embodiment of the medical injector of the present invention, and fig. 3 is a partially enlarged view of a portion a in fig. 1. The transmission gear set 4 includes an input gear 41, an output gear 42, and a plurality of transmission gears connected between the input gear 41 and the output gear 42, and the input gear 41 is connected to an output shaft of the motor 3 as a rotation driving unit.
The output gear 42 comprises a first gear section 421, a second gear section 422 and a third gear section 423 which are sequentially connected along the axial direction, gear teeth are arranged on the third gear section 423, and the outer diameters of the first gear section 421, the second gear section 422 and the third gear section 423 are sequentially increased. The output gear 42 is provided with an insertion concave portion 424 on an axial end face of the first gear segment 421, and the insertion concave portion 424 is in a line shape on an axial projection. When the output gear 42 is mounted in the set position of the set transmission space 102, the axial direction of the output gear 42 is parallel to the axial direction of the medicine placing space 101, and the insertion recess 424 faces the blocking wall 121.
The blocking wall 121 is provided with a connecting through hole 122 communicated between the transmission space 102 and the medicine placing space 101, a step position 123 axially communicated with the connecting through hole 122 is formed on the blocking wall 121, a step surface 124 facing the output gear 42 is formed between the step position 123 and the connecting through hole 122, the first gear section 421 is positioned in the step position 123, the outer peripheral surface of the first gear section 421 is matched with the inner peripheral surface of the step position 123, and the second gear section 422 is in spacing fit with the blocking wall 121 in the axial direction. A space for receiving the shoulder portion 513 of the lead screw 51 is formed between the stepped surface 124 and the end surface of the first gear segment 421.
The pushing assembly 5 comprises a screw rod 51, the screw rod 51 is provided with a thread part 511, a rotating matching part 512, a shaft shoulder part 513 and an insertion bulge 514 which are sequentially arranged in the axial direction, the insertion bulge 514 bulges along the axial direction from the axial end surface of the shaft shoulder part 513, the insertion bulge 514 is in a shape like a Chinese character 'yi' in the axial projection, the inner peripheral outline of the insertion concave part 424 is matched with the outer peripheral outline of the insertion bulge 514, and the extending tail end of the insertion bulge 514 is provided with a guide inclined plane. An annular groove 510 is formed in the outer periphery of the rotation fitting portion 512, and a seal ring 515 is provided in the annular groove 510.
Before the transmission gear set 4 is installed in the transmission space 102, the screw rod 51 penetrates through the connecting through hole 122, the thread part 511 penetrates out of the medicine placing space 501, the rotating matching part 512 is located in the connecting through hole 122, the rotating matching part 512 is in rotating matching with the blocking wall 121, and the sealing ring 515 is arranged between the rotating matching part 512 and the inner circumferential surface of the connecting through hole 122; the shaft shoulder 513 is located in the step 123. After the output gear 42 is installed, the insertion protrusion 514 is inserted into the insertion recess 424, and the shoulder 513 is limited between the stepped surface 124 and the end surface of the first gear segment 421. When carrying out the installation that promotes subassembly 5 or using the medicine syringe, all can not lead to the swing because of the unstability of lead screw axial position, reduce the assembly degree of difficulty and improve the injection precision.
Referring to fig. 4, fig. 4 is a cross-sectional view of the first housing in an embodiment of the medical injector of the present invention. The inner circumferential surface 111 of the medicine containing space 101 is provided with a guide rib 112 extending in the axial direction, the guide rib 112 extends between the second end 101b and the first position 101c, a first guide inclined surface 113 is provided on an extending end portion of the guide rib 112 located at the first position 101c, and the first guide inclined surface 113 faces the first end 101a and faces the circumferential direction of the medicine containing space 101.
Referring to fig. 1, 4 and 5, fig. 5 is a structural diagram of a first working state of a pushing assembly in an embodiment of a medical injector according to the present invention. The pushing assembly 5 includes a screw 51, a first pushing member 52, a second pushing member 53, and a rotation stopping sleeve 54.
The first pusher 52 has a first peripheral wall 521, an inner peripheral surface of the first peripheral wall 521 is provided with a shoulder 522 away from the extended first end 101a, and an inner periphery of the shoulder 522 is provided with a first internal thread; a first external thread is arranged on the periphery of the threaded part 511, the first pushing piece 52 is sleeved outside the screw rod 51, and the first external thread is matched with the first internal thread; the stopper 59 is detachably attached to the threaded portion 511 at an axial end portion toward the extended first end 101a, the stopper 59 is a stopper bolt, and the stopper 59 limits the shoulder 522 in the axial direction.
The second pusher 53 has a pusher face 530 on an axial end thereof; the inner periphery of the second pushing piece 53 is provided with a second internal thread, and the outer periphery of the first pushing piece 52 is provided with a second external thread; the second pushing member 53 is sleeved outside the first pushing member 52, the second external thread is matched with the second internal thread, and the pushing surface 530 faces the placing inlet 119. The outer periphery of the second pusher 53 is provided with a pair of guide protrusions 531 at an end near the extended first end 101a, the guide protrusions 531 are provided with second guide inclined surfaces 531a, and the second guide inclined surfaces 531a face away from the axial center of the guide protrusions 531 and face the second blocking surfaces 542 b.
The rotation stopping sleeve 54 penetrates through the axial direction, a pair of guide concave positions 544 which are symmetrically arranged are arranged on the periphery of the rotation stopping sleeve 54, a pair of guide grooves 542 which extend along the axial direction and penetrate through the inner side and the outer side of the rotation stopping sleeve 54 are further arranged on the rotation stopping sleeve 54, and the arrangement directions of the guide concave positions 544 and the guide grooves 542 are different by 90 degrees; a first stop surface 542a is arranged in the guide groove 542 close to the extending tail end of the extending first end 101a, a stop ring 543 which is formed by protruding from the outer circumferential surface of the rotation stop sleeve 54 to the outer circumference is arranged at the axial end part of the rotation stop sleeve 54 far away from the extending first end 101a, a second stop surface 542b is arranged in the guide groove 542 far away from the extending tail end of the extending first end 101a, and the second stop surface 542b is the surface of the stop ring 543; the retainer ring 543 is provided with a pair of axially extending guide recesses 544.
The rotation stopping sleeve 54 is sleeved outside the second pushing member 53, the guide protrusion 531 is in sliding fit with the guide groove 542 in the axial direction, the first blocking surface axially blocks the guide protrusion 531, and the guide recess 544 on the rotation stopping sleeve 54 is in sliding fit with the guide convex strip 112 on the inner circumferential surface 111 of the medicine placing space 101 in the axial direction.
After the motor 3 is started to enable the screw rod 51 to rotate, the first pushing piece 52 translates relative to the screw rod 51, the second pushing piece 53 can translate relative to the first pushing piece 52, and under the premise that the limit distance pushing is not changed, the size of the first pushing piece, the second pushing piece and the second pushing piece in the axial direction is smaller when the first pushing piece, the second pushing piece and the third pushing piece are in a shrinkage state, so that the medicine placing space 101 can be set to be smaller in axial size, and the medicine injection is enabled to have a smaller.
Referring to fig. 6, fig. 6 is a structural diagram of a second working state of the pushing assembly in the embodiment of the medical injector of the present invention. In the axial direction, the rotation preventing sleeve 54 is movable and extends between the second end 101b and a second position 101d, the second position 101d being a position where the guide recess 544 is close to the extended first end 101a relative to the first position 101c, and the guide recess 544 is separated from the guide rib 112. After the first pushing member 52 and the second pushing member 53 reach the extreme positions, when the second pushing member 53 drives the rotation stopping sleeve 54 to move to the second position 101d towards the extended first end 101a, the guide concave part 544 is separated from the guide convex strip 112, at this time, the rotation stopping matching relationship between the rotation stopping sleeve 54 and the housing 1 is released, and the first pushing member 53 and the second pushing member 52 rotate along with the screw rod 51, so that the pushing structure 5 and the medicine container are prevented from being damaged.
Finally, it should be emphasized that the above-described embodiments are merely preferred examples of the present invention, and are not intended to limit the invention, as those skilled in the art will appreciate that various changes and modifications may be made, and any and all modifications, equivalents, and improvements made, while remaining within the spirit and principles of the present invention, are intended to be included within the scope of the present invention.
Claims (10)
1. The medicine injector comprises a shell, a transmission gear set and a pushing assembly, wherein a transmission space and a medicine placing space are arranged in the shell, the shell is provided with a blocking wall which is blocked between the transmission space and the medicine placing space, and a connecting through hole which is communicated between the transmission space and the medicine placing space is formed in the blocking wall;
the transmission gear set is arranged in the transmission space, and the pushing assembly is arranged in the medicine placing space;
the transmission gear set comprises an output gear, the pushing assembly comprises a screw rod, the screw rod passes through the connecting through hole, and the screw rod is detachably and coaxially connected with the output gear;
the method is characterized in that:
the screw rod is provided with a shaft shoulder part, and the shaft shoulder part is limited between the retaining wall and the output gear in the axial direction of the screw rod.
2. The drug injector of claim 1, wherein:
a step position communicated with the connecting through hole in the axial direction is formed on the blocking wall, and a step surface facing the output gear is formed between the step position and the connecting through hole;
the shaft shoulder part is positioned in the step part, and the shaft shoulder part is limited between the step surface and the output gear.
3. The drug injector of claim 2, wherein:
the output gear comprises a first gear section and a second gear section which are sequentially connected along the axial direction;
the first gear section is located in the step position, the outer peripheral surface of the first gear section is matched with the inner peripheral surface of the step position, and the shaft shoulder is limited between the step surface and the end surface of the first gear section;
the second gear section is in limit fit with the blocking wall in the axial direction.
4. The drug injector of claim 3, wherein:
the output gear comprises a first gear section, a second gear section and a third gear section which are sequentially connected along the axial direction, gear teeth are arranged on the third gear section, and the outer diameters of the first gear section, the second gear section and the third gear section are sequentially increased.
5. The drug injector of any of claims 1 to 4, wherein:
the screw rod further comprises a rotation matching part, the rotation matching part is located in the connecting through hole, and the rotation matching part is in rotation matching with the blocking wall.
6. The drug injector of claim 5, wherein:
the medicine injector further comprises a sealing ring, and the sealing ring is arranged between the rotating matching part and the inner circumferential surface of the connecting through hole.
7. The drug injector of claim 6, wherein:
the periphery of the rotating fit part is provided with an annular groove, and the sealing ring is located in the annular groove.
8. The drug injector of any of claims 1 to 4, wherein:
the axial end part of the screw rod is provided with an inserting bulge, and the periphery of the inserting bulge is provided with at least one edge;
the output gear is provided with an inserting concave position, and the inner peripheral outline of the inserting concave position is matched with the outer peripheral outline of the inserting bulge;
the insertion bulge is inserted in the insertion concave position.
9. The drug injector of claim 8, wherein:
on the axial projection, the insertion bulge is in a straight shape.
10. The drug injector of claim 8, wherein:
in the axial direction, the extending tail end of the inserting projection is provided with a guide inclined plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921949915.1U CN212166260U (en) | 2019-11-12 | 2019-11-12 | Medicine injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921949915.1U CN212166260U (en) | 2019-11-12 | 2019-11-12 | Medicine injector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212166260U true CN212166260U (en) | 2020-12-18 |
Family
ID=73763482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921949915.1U Active CN212166260U (en) | 2019-11-12 | 2019-11-12 | Medicine injector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212166260U (en) |
-
2019
- 2019-11-12 CN CN201921949915.1U patent/CN212166260U/en active Active
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