Medical external pump

Abstract

The utility model belongs to the technical field of miniature spraying devices, and particularly relates to a medical external pump. A valve seat is formed at the lower end of the pump body, a valve plate is arranged on the valve seat, a valve rod penetrates through the pump cover, a valve needle is arranged in a lower connecting portion of the valve rod, and the lower end of the valve needle extends into the pump body and is sleeved with a piston. An exhaust hole is formed in a piston of the pump body, a head cap is arranged at the top of the valve rod, a mounting column is arranged in the head cap and connected with an upper connecting portion of the valve rod, a radial liquid channel is formed in the lower end of the valve needle, axial liquid channels are formed in the valve needle, the partition plate and the mounting column, and a spring is arranged between the valve rod and the pump cover. The radial liquid channel is opened when the valve needle moves to the valve plate; the spring is arranged between the valve rod and the pump cover and does not make contact with liquid medicine, and the situation that the service life of the spring and the service life of the pump are affected due to the fact that the liquid medicine corrodes the spring can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of micro - spray device, especially point to a medical external pump. BACKGROUND

[0002] External pump is a kind of micro - spray nozzle, is widely used in medical field.The working principle of the existing external pump is that piston moves in pump body, gas flows in pump body, pressure becomes small, the pressure of the pump body outside does not change, the pressure difference is generated in pump body, liquid is guided out of pump body by pressure difference, and liquid is atomized when it meets high-speed airflow.The spring in the existing external pump in medical field contacts with liquid medicine, and the liquid medicine can corrode the spring, and the substances produced after corrosion can mix into liquid medicine, resulting in contamination of liquid medicine. SUMMARY

[0003] The utility model discloses a spring does not contact with liquid medicine, and the service life is long, and will not contaminate the medical external pump of liquid medicine.

[0004] The utility model is realized in this way:

[0005] A kind of medical external pump, including spiral, pump cover and pump body, the spiral is the cylinder with top plate, pump cover is arranged on top plate, the lower end of pump cover penetrates top plate and extends into spiral, pump body is sleeved in the lower end of pump cover, the lower end of pump body has neck-in portion, and is formed with valve seat, valve piece is arranged on valve seat, valve rod penetrates pump cover, the upper part of valve rod is provided with partition plate to make the upper connecting portion, lower connecting portion in valve rod cavity, valve needle is arranged in the lower connecting portion of valve rod, the lower end of valve needle extends into pump body and is sleeved with piston, the outer side wall of piston is slidingly sealed with the inner wall of pump body, exhaust hole is arranged at the piston of pump body, head cap is arranged on the top of valve rod, installation column is arranged in head cap, installation column is connected with the upper connecting portion of valve rod, the lower end of valve needle is provided with radial liquid passage, axial liquid passage that is communicated with the valve piece on head cap and radial liquid passage is arranged on valve needle, partition plate, installation column, the spring is arranged between valve rod and pump cover, radial liquid passage is opened when valve needle moves to valve piece.

[0006] In the above-mentioned medical external pump, the side wall of the pump body close to the valve seat is provided with an annular boss, and the valve piece is limited between the annular boss and the valve seat.

[0007] In the above-mentioned medical external pump, the spring is a plastic spring.

[0008] In the above-mentioned medical external pump, the plastic spring comprises upper and lower annular rings arranged at intervals, two elastic strips are evenly distributed between the upper and lower annular rings, the elastic strip comprises an upper vertical strip and a lower vertical strip, the upper vertical strip and the lower vertical strip are connected by an arc-shaped strip, and the two elastic strips are staggered and arranged in an X-shaped distribution.

[0009] In the medical external pump, the piston comprises an inner cylinder and an outer cylinder, the inner cylinder and the outer cylinder are arranged at intervals and are connected through an annular convex edge, the outer side wall of the inner cylinder is sealingly connected with the inner hole wall of the valve rod, the inner side wall is sealingly connected with the outer side wall of the valve needle, the outer side wall of the outer cylinder is sealingly connected with the inner hole wall of the pump body, the lower end of the valve rod extends into the space between the inner cylinder and the outer cylinder, and the lower end of the valve needle is provided with an upturned edge which extends into the space between the inner cylinder and the outer cylinder.

[0010] In the medical external pump, the top plate of the spiral is provided with an outer cover clamping seat which extends axially upward, and an outer cover is sleeved on the outer cover clamping seat, and the lower end of the head cap extends into the outer cover clamping seat.

[0011] In the medical external pump, the top plate is provided with stepped holes, including a first center hole and a second center hole, the diameter of the first center hole is larger than that of the second center hole, a first stepped surface is formed between the first center hole and the second center hole, the pump cover comprises a first convex edge, the lower part of the first convex edge has a smaller diameter than the upper part, a second stepped surface is formed between the upper part and the lower part, the lower part of the convex edge of the pump cover is arranged in the second center hole, the upper part is arranged in the first center hole, and the second stepped surface abuts against the first stepped surface.

[0012] In the medical external pump, the top of the pump body is provided with a second convex edge, the second convex edge is in contact with the bottom surface of the top plate and the first convex edge.

[0013] In the medical external pump, the valve piece comprises a cylindrical body, a valve core is arranged in the cylindrical body through an elastic sheet, and the valve core is blocked at the liquid inlet of the valve seat.

[0014] In the medical external pump, the spiral, the pump cover, the pump body, the valve needle and the valve piece are all made of plastic material.

[0015] Compared with the prior art, the utility model has the advantages of:

[0016] 1. The spring is arranged between the valve rod and the pump cover and does not contact the liquid medicine, so that the corrosion of the liquid medicine on the spring can be avoided, the service life of the spring is affected, and finally the service life of the external pump is affected. In addition, substances produced after the spring is corroded can also be prevented from mixing into the liquid medicine, causing pollution of the liquid medicine and affecting the medicinal effect.

[0017] 2. The utility model is made of full plastic material, compared with the existing external pump which uses glass beads as the structure of the one-way valve, the contact between glass and liquid medicine can be avoided, and the valve piece made of plastic material is good in corrosion resistance. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a three-dimensional schematic view of the present application;

[0019] Figure 2 is a schematic view after the outer cover is pulled off of the present application;

[0020] Figure 3 is a top view of the present application;

[0021] Figure 4 is Figure 3 A-A sectional view of the present application;

[0022] Figure 5 is an exploded schematic view of the present application;

[0023] Figure 6 is a schematic view of the plastic spring of the present application;

[0024] Figure 7 is a schematic view of the valve disc of the present application.

[0025] In the figure: 1, spiral; 2, pump cover; 3, pump body; 4, top plate; 5, valve seat; 6, valve disc; 7, valve stem; 8, spray piece; 9, partition plate; 10, valve needle; 11, piston; 12, exhaust hole; 13, head cap; 14, mounting column; 15, radial liquid passage; 16, annular boss; 17, axial liquid passage; 18, spring; 19, upper annular ring; 20, lower annular ring; 21, elastic strip; 22, upper vertical strip; 23, lower vertical strip; 24, arc-shaped strip; 25, inner column body; 26, outer column body; 27, upper flange; 28, outer cover clamping seat; 29, outer cover; 30, second convex edge; 31, cylindrical main body; 32, elastic sheet; 33, valve core; 34, liquid inlet. DETAILED DESCRIPTION

[0026] The present application will be further described in specific embodiments, referring to Figure 1 -7:

[0027] The utility model provides a kind of medical external pump, and the medical external pump includes spiral 1, pump cover 2 and pump body 3, the spiral 1 is the cylinder with top plate 4, pump cover 2 is provided on top plate 4, the lower end of pump cover 2 is inserted into spiral 1 and passes through top plate 4, pump body 3 is sleeved in the lower end of pump cover 2, the lower end of pump body 3 has necking portion, and valve seat 5 is formed, valve piece 6 is provided on valve seat 5, valve rod 7 passes through pump cover 2, the upper portion of valve rod 7 is provided with partition plate 9 to make the inner cavity of valve rod 7 form upper connecting portion, lower connecting portion, valve needle 10 is provided in the lower connecting portion of valve rod 7, the lower end of valve needle 10 is inserted into pump body 3 and is sleeved with piston 11, the outer side wall of piston 11 is slidingly sealed with the inner wall of pump body 3, exhaust hole 12 is provided at the piston 11 of pump body 3, head cap 13 is provided on the top of valve rod 7, mounting column 14 is provided in head cap 13, and mounting column 14 is connected with the upper connecting portion of valve rod 7, the lower end of valve needle 10 is provided with radial liquid passage 15, axial liquid passage 17 that communicates with the radial liquid passage 15 and the spray piece 8 on head cap 13 is provided on valve needle 10, partition plate 9 and mounting column 14, spring 18 is provided between valve rod 7 and pump cover 2, and radial liquid passage 15 is opened when valve needle 10 moves to valve piece 6.

[0028] Further, annular boss 16 is provided on the side wall of pump body 3 close to valve seat 5, and valve piece 6 is limited between annular boss 16 and valve seat 5.

[0029] The spring 18 of the utility model is arranged between valve rod 7 and pump cover 2 and does not contact with liquid medicine, which can avoid the corrosion of liquid medicine to the spring 18 and affect the service life of the spring 18 and the service life of the external pump. In addition, substances produced by the corrosion of spring 18 can also be avoided from mixing into liquid medicine, which can avoid the pollution of liquid medicine.

[0030] Further, the spring 18 is a plastic spring.

[0031] Specifically, the plastic spring includes upper annular ring 19 and lower annular ring 20 arranged in an upper-lower interval, two elastic strips 21 are uniformly distributed between the upper annular ring 19 and the lower annular ring 20, the elastic strip 21 includes upper vertical strip 22 and lower vertical strip 23, the upper vertical strip 22 and the lower vertical strip 23 are connected by arc-shaped strip 24, and the two elastic strips 21 are arranged in an X-shaped distribution in an interlaced manner. The plastic spring has high practicability, long service life, good stability and good reset effect.

[0032] When the above plastic spring is compressed, the two elastic strips 21 are deformed and compressed, and the reset is driven by the elastic strip 21 during reset.

[0033] Furthermore, the piston 11 comprises an inner cylinder 25 and an outer cylinder 26, the inner cylinder 25 and the outer cylinder 26 are arranged at intervals and are connected through an annular convex edge, the outer side wall of the inner cylinder 25 is sealingly connected with the inner hole wall of the valve rod 7, the inner side wall is sealingly connected with the outer side wall of the valve needle 10, the outer side wall of the outer cylinder 26 is sealingly connected with the inner hole wall of the pump body 3, the lower end of the valve rod 7 extends into the inner cylinder 25 and the outer cylinder 26, and the lower end of the valve needle 10 is provided with an upturned edge 27 which extends into the inner cylinder 25 and the outer cylinder 26.

[0034] The top plate 4 of the spiral 1 extends axially upwardly and has an outer cover clamping seat 28, an outer cover 29 is sleeved on the outer cover clamping seat 28, the outer cover 29 is generally made of transparent material, the lower end of the head cap 13 extends into the outer cover clamping seat 28, and the dustproof effect is achieved, and meanwhile, the whole can be more beautiful.

[0035] The pump cover 2 and the top plate 4 are connected in the following mode: the top plate 4 is provided with stepped holes, including a first center hole and a second center hole, the hole diameter of the first center hole is larger than that of the second center hole, and a first stepped surface is formed between the first center hole and the second center hole; the pump cover 2 comprises a first convex edge, the lower part of the first convex edge has a smaller diameter than the upper part, a second stepped surface is formed between the upper part and the lower part, the lower part of the first convex edge of the pump cover 2 is arranged in the second center hole, the upper part is arranged in the first center hole, and the second stepped surface abuts against the first stepped surface.

[0036] In addition, the pump cover 2 and the top plate 4 can also be connected in a threaded connection mode.

[0037] It should be noted that the top of the pump body 3 is provided with a second convex edge 30, the second convex edge 30 is in contact connection with the top plate 4 and the bottom surface of the first convex edge.

[0038] The connection structure of the second convex edge 30 and the top plate 4 and the first convex edge in combination with the connection structure of the first convex edge of the pump cover 2 and the top plate 4 can form a structure similar to a labyrinth seal, and can prevent the liquid in the container from entering the top plate 4 and contacting the spring 18.

[0039] Further, the valve piece 6 is a one-way valve, comprising a cylindrical body 31, a valve core 33 is arranged in the cylindrical body 31 through an elastic sheet 32, and the valve core 33 is blocked at a liquid inlet 34 of the valve seat 5.

[0040] As a preferred scheme, the spiral 1, the pump cover 2, the pump body 3, the valve needle 10, the valve piece 6 and the outer cover 29 are all made of plastic material. That is to say, the external pump is made of full plastic material and can be applied to the medical field.

[0041] In use, the utility model discloses a screw 1 and the container's threaded part screwing through.

[0042] Working principle:

[0043] Pull out the outer cover 29;

[0044] Press the head cap 13, overcome the spring 18's elasticity, valve rod 7, valve needle 10 and piston 11 together synchronous down, at this time, pump body 3 inner chamber (the part between valve needle 10 and valve piece 6) pressure is greater than the pressure outside, at this time valve piece 6 seals the liquid inlet 34 place;

[0045] When the piston is against the annular boss close to valve piece 6, continue to press the head cap, valve needle 10 continues to move down, the radial liquid passage 15 on valve needle 10 is opened, and the liquid medicine is atomized and sprayed through radial liquid passage 15, axial liquid passage 17 and spray piece 8;

[0046] Loosen the head cap, under the spring force of spring 18, valve rod 7, valve needle 10 and piston 11 together synchronous upward movement, and the pressure formed in pump body 3 is reduced, and the valve core is absorbed to leave the valve seat upward, and the liquid inlet 34 is opened, and the liquid medicine enters the inner cavity of pump body 3 from the outside of pump body.

[0047] The above embodiment is only one of the preferred embodiments of the utility model, and does not limit the implementation range of the utility model, so: all equivalent changes made according to the shape, structure and principle of the utility model should be covered in the protection scope of the utility model.

Claims

1. An ambulatory medical pump, characterized by: The utility model provides a pump, including spiral (1), pump cover (2) and pump body (3), spiral (1) is the cylinder with top plate (4), is provided with pump cover (2) on top plate (4), the lower end of pump cover (2) is inserted into spiral (1) through top plate (4), pump body (3) is sleeved in the lower end of pump cover (2), the lower end of pump body (3) has the necking part, and is formed with valve seat (5), is provided with valve piece (6) on valve seat (5), valve rod (7) is inserted into pump cover (2), the upper portion of valve rod (7) is provided with the partition plate (9) and makes the inner chamber of valve rod (7) form upper connecting portion, lower connecting portion, is provided with valve needle (10) in the lower connecting portion of valve rod (7), the lower end of valve needle (10) is inserted into pump body (3) and is sleeved with piston (11), the outer side wall of piston (11) is sealed with the inner wall of pump body (3), is provided with exhaust hole (12) at the piston (11) of pump body (3), is provided with head cap (13) on the top of valve rod (7), is provided with mounting column (14) in head cap (13), and mounting column (14) is connected with the upper connecting portion of valve rod (7), the lower end of valve needle (10) is provided with radial liquid passage (15), is provided with axial liquid passage (17) with valve piece (6) and radial liquid passage (15) on valve needle (10), partition plate (9), mounting column (14) and head cap (13) communication, the spring (18) is arranged between valve rod (7) and pump cover (2), and radial liquid passage (15) is opened when valve needle (10) moves to valve piece (6).

2. The medical external pump according to claim 1, characterized in that: The side wall of pump body (3) is provided with an annular boss (16) near valve seat (5), and valve piece (6) is limited between annular boss (16) and valve seat (5).

3. The medical external pump of claim 1, wherein: The spring (18) is a plastic spring.

4. The medical external pump according to claim 3, characterized in that: The plastic spring comprises an upper annular ring (19) and a lower annular ring (20) arranged in an upper-lower spaced manner, two elastic strips (21) are uniformly distributed between the upper annular ring (19) and the lower annular ring (20), the elastic strip (21) comprises an upper vertical strip (22) and a lower vertical strip (23), the upper vertical strip (22) and the lower vertical strip (23) are connected by an arc-shaped strip (24), and the two elastic strips (21) are staggered and arranged in an X-shaped distribution.

5. A medical external pump according to any one of claims 1-4, characterized in that: The piston (11) comprises an inner cylinder (25) and an outer cylinder (26), the inner cylinder (25) and the outer cylinder (26) are arranged in a spaced manner and connected by an annular convex edge, the outer side wall of the inner cylinder (25) is sealingly connected with the inner hole wall of the valve rod (7), the inner side wall is sealingly connected with the outer side wall of the valve needle (10), the outer side wall of the outer cylinder (26) is sealingly connected with the inner hole wall of the pump body (3), the lower end of the valve rod (7) extends between the inner cylinder (25) and the outer cylinder (26), and the lower end of the valve needle (10) is provided with an upper turned edge (27) extending between the inner cylinder (25) and the outer cylinder (26).

6. The medical external pump of claim 1, wherein: The top plate (4) of the spiral (1) extends axially upward with an outer cover clamping seat (28), and an outer cover (29) is sleeved on the outer cover clamping seat (28), and the lower end of the head cap (13) extends into the outer cover clamping seat (28).

7. The medical external pump of claim 1, wherein: The top plate (4) is provided with stepped holes, including a first center hole and a second center hole, the first center hole has a larger diameter than the second center hole, a first stepped surface is formed between the first center hole and the second center hole, the pump cover (2) includes a first convex edge, the lower part of the first convex edge has a smaller diameter than the upper part, a second stepped surface is formed between the upper part and the lower part, the lower part of the convex edge of the pump cover (2) is arranged in the second center hole, the upper part is arranged in the first center hole, and the second stepped surface abuts against the first stepped surface.

8. The medical external pump of claim 1, wherein: The top of the pump body (3) is provided with a second convex edge (30), the second convex edge (30) is in contact with the top plate (4) and the bottom surface of the first convex edge.

9. The medical external pump of claim 1, wherein: The valve piece (6) includes a cylindrical body (31), a valve core (33) is arranged in the cylindrical body (31) through an elastic sheet (32), and the valve core (33) is blocked at the liquid inlet (34) of the valve seat (5).

10. The medical external pump of claim 9, wherein: The screw (1), the pump cover (2), the pump body (3), the valve needle (10) and the valve piece (6) are all made of plastic material.

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