CN212439612U - Push rod resetting mechanism of needleless injector - Google Patents

Abstract

The utility model relates to the technical field of needleless injectors, in particular to a push rod resetting mechanism of a needleless injector, which comprises an oil storage cylinder for storing hydraulic oil, a pull rod and a resetting piston fixed at the front end of the pull rod, wherein the oil storage cylinder is fixed on a gun body, the resetting piston is slidably arranged in the oil storage cylinder, the front end of the gun body is fixedly provided with a valve body, an oil return flow passage is arranged in the valve body, the outer end of the oil return flow passage is communicated with the front end of the oil storage cylinder, the inner end of the oil return flow passage is communicated with the position between a stepping piston and a hydraulic piston, and an oil return one-way valve for preventing the hydraulic oil between the stepping piston and the hydraulic piston from entering the oil storage cylinder is arranged in the oil return flow passage, therefore, the resetting of the stepping piston and the push rod fixed on the stepping piston is realized, the operation is simple, and the resetting precision is high.

Description

Push rod resetting mechanism of needleless injector

Technical Field

The utility model relates to a needleless injector technical field, especially a push rod canceling release mechanical system of needleless injector.

Background

The needleless injector has the working principle that instant high pressure is generated after power is released by a power source to push liquid medicine to be sprayed out from the micron-sized pores, and high-speed liquid medicine flow can instantly penetrate through the skin to reach the subcutaneous part, so that the liquid medicine is dispersed and distributed under the subcutaneous part, the acting time is faster, and the medicine absorption rate is higher;

the needleless injector generally pushes the push rod to move at a high speed along the linear direction through the power mechanism, so that the push rod pushes the liquid medicine quickly to form injection, and the push rod is reset after injection.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: in order to solve the problems of complex operation and low resetting precision caused by the fact that a push rod directly pushes a push rod to reset when a needleless injector in the prior art is reset, a push rod resetting mechanism of the needleless injector is provided.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a push rod canceling release mechanical system of needleless injector, the needleless injector includes the rifle body, outer hydraulic pressure pipe, interior hydraulic pressure pipe and power unit, interior hydraulic pressure pipe is fixed in the rifle body, outer hydraulic pressure pipe is fixed at the front end of the rifle body, and the tail end of outer hydraulic pressure pipe and the head end of interior hydraulic pressure pipe communicate, is equipped with the push rod that is used for the injection in the outer hydraulic pressure pipe, the tail end on the push rod is fixed with step piston, and step piston slidable mounting is in outer hydraulic pressure pipe, slidable mounting has hydraulic piston in the interior hydraulic pressure pipe, power unit is used for driving hydraulic piston along the axis direction reciprocating motion of interior hydraulic pressure pipe, and this push rod canceling release mechanical system is including the oil storage section of thick bamboo, the pull rod that are used for saving hydraulic oil and fixing the reset piston at the pull rod front end, the oil storage section of thick bamboo is fixed on the rifle body, set up the oil return runner in the valve body, the outer end of oil return runner and the front end intercommunication of an oil storage section of thick bamboo, the inner of oil return runner and the position intercommunication between step-by-step piston and the hydraulic piston, be equipped with the oil return check valve that is used for preventing hydraulic oil between step-by-step piston and the hydraulic piston to get into an oil storage section of thick bamboo in the oil return runner, be equipped with on the valve body and be used for unblock oil return check valve to make the unblocked one-way unblock structure of oil return runner.

According to the scheme, the oil return one-way valve is unlocked through the one-way unlocking structure, the oil return flow channel is opened, so that when the pull rod is pulled backwards, hydraulic oil between the stepping piston and the hydraulic piston can be extracted to the oil storage cylinder through the oil return flow channel, the stepping piston and the push rod fixed on the stepping piston are reset, the operation is simple, and the resetting precision is high.

Furthermore, a threaded sleeve is connected to the tail end of the oil storage cylinder in a threaded manner, the front end of the threaded sleeve extends into the oil storage cylinder, and the pull rod penetrates through the threaded sleeve; the distance between the screw sleeve and the front end of the oil storage cylinder is changed by rotating the screw sleeve, so that the maximum distance that the pull rod can be pulled backwards is changed, and the backward movement displacement of the push rod can be accurately adjusted according to the injected dose; specifically, according to the next injection dosage, after the position of the screw sleeve is adjusted, the pull rod is pulled backwards until the front end part of the reset piston screw sleeve is contacted, so that the reset of the push rod is completed.

Furthermore, an injection one-way valve is arranged between the inner hydraulic pipe and the outer hydraulic pipe, a first oil cavity for containing hydraulic oil is formed between the hydraulic piston and the injection one-way valve, a second oil cavity is formed between the injection one-way valve and the stepping piston, the hydraulic oil in the first oil cavity can reach the second oil cavity through the injection one-way valve, and the inner end of the oil return flow passage is communicated with the second oil cavity; the injection check valve may prevent the hydraulic oil in the second oil chamber from returning to the first oil chamber.

Furthermore, the oil return check valve comprises an oil return plug, an oil return spring, a sealing ball and a valve seat, wherein a valve hole is formed in the valve seat, the valve seat is arranged in the oil return flow channel, the valve hole of the valve seat is communicated with the oil return flow channel, the oil return plug and the valve seat are both fixed in the valve body, the oil return spring and the sealing ball are both positioned between the oil return plug and the valve seat, one end of the oil return spring props against the oil return plug, the other end of the oil return spring props against the sealing ball, and the sealing ball blocks the;

the one-way unlocking structure comprises a pressure relief button which is slidably arranged on the valve body and used for pushing the sealing ball to be far away from the valve seat;

when the pressure relief button is pressed inwards, the pressure relief button pushes the sealing ball to be far away from the valve seat, the oil return spring is compressed, and the sealing ball blocks the valve hole, so that hydraulic oil in the oil return flow channel can flow back.

Furthermore, the pressure release button can rotate relative to the valve body, one end of the pressure release button, which is close to the sealing ball, extends to form a thin section, the outer peripheral surface of the pressure release button is provided with an inner arc-shaped groove and an outer arc-shaped groove, the outer arc-shaped groove is positioned on one side, which is far away from the sealing ball, of the inner arc-shaped groove, the outer arc-shaped groove is communicated with the inner arc-shaped groove, a locking plate is fixed in the valve body and embedded into the inner arc-shaped groove, the radian of the inner arc-shaped groove is smaller than that of the outer arc-shaped groove, and a sealing ring is arranged between the outer peripheral surface of the pressure release button;

after the pressure release button is pressed, the locking plate can relatively arrive in the outer arc-shaped groove, then rotate the pressure release button alright make the locking plate card in the outer arc-shaped groove to maintain the pressure release button in the unblock state, the operation of being convenient for, and when the pressure release button was not pressed, the locking plate was embedded into in the arc-shaped groove, can prevent that the pressure release button from droing from the valve body.

Furthermore, the thin section is sleeved with a pressing spring, one end of the pressing spring abuts against the valve seat, the other end of the pressing spring abuts against the pressure relief button, and the pressure relief button can be conveniently reset after being pressed by the pressing spring.

The utility model has the advantages that: the utility model discloses needleless injector's push rod canceling release mechanical system passes through one-way unlocking structure and with the unblock of oil return check valve, the oil return runner is opened to when the pull rod is by the backward pulling, can extract the hydraulic oil between step-by-step piston and the hydraulic piston to an oil storage section of thick bamboo through the oil return runner, realize step-by-step piston and fix the resetting of the push rod on step-by-step piston with this, easy operation, the precision that resets is high.

Drawings

The present invention will be further explained with reference to the drawings and examples.

FIG. 1 is a schematic view of a plunger reset mechanism of the needleless injector of the present invention;

FIG. 2 is an enlarged partial schematic view of A in FIG. 2;

fig. 3 is an exploded view of the valve body portion of the push rod reset mechanism of the needleless injector of the present invention;

FIG. 4 is a schematic front view of a valve body portion of a push rod reset mechanism of the needleless injector of the present invention;

FIG. 5 is a schematic sectional view taken along line B-B in FIG. 4;

FIG. 6 is a schematic sectional view taken along line C-C in FIG. 4;

FIG. 7 is a schematic view showing the combination of a pressure release button and an oil return check valve in the plunger return mechanism of the needleless injector of the present invention;

fig. 8 is a schematic view of a pressure release button in the plunger return mechanism of the needleless injector of the present invention.

In the figure: 1. the device comprises a gun body, 101, a rodless cavity, 102, a rod cavity, 103, an air inlet hole, 104, an air outlet hole, 2, a pneumatic piston, 201, a piston rod, 3, a hydraulic rod, 301, a hydraulic piston, 4, an inner hydraulic pipe, 5, an outer hydraulic pipe, 6, a stepping piston, 601, a push rod, 7, an injection one-way valve, 8, an oil return flow channel, 9, an oil return one-way valve, 901, an oil return plug, 902, an oil return spring, 903, a sealing ball, 904, a valve seat, 9041 and a valve hole;

10. the oil storage cylinder comprises an oil storage cylinder body, 11, a reset piston, 1101, a pull rod, 12, a valve body, 13, a first oil cavity, 14, a second oil cavity, 15, a pressure relief button, 1501, an inner arc-shaped groove, 1502, an outer arc-shaped groove, 1503, a thin section, 16, a pressing spring, 17, a sealing ring, 18, a locking plate, 19, a threaded sleeve, 20 and a medicine core.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic drawings, which illustrate the basic structure of the invention only in a schematic way, and thus show only the components that are relevant to the invention, and the directions and references (e.g., upper, lower, left, right, etc.) may be used only to help describe the features in the drawings. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the claimed subject matter is defined only by the appended claims and equivalents thereof.

Example 1

As shown in fig. 1-8, a push rod resetting mechanism of a needleless injector, the needleless injector includes a gun body 1, an outer hydraulic tube 5, an inner hydraulic tube 4 and a power mechanism, the inner hydraulic tube 4 is fixed in the gun body 1, the outer hydraulic tube 5 is fixed at the front end of the gun body 1, the tail end of the outer hydraulic tube 5 is communicated with the head end of the inner hydraulic tube 4, a push rod 601 for injection is arranged in the outer hydraulic tube 5, a step piston 6 is fixed at the tail end of the push rod 601, the step piston 6 is slidably mounted in the outer hydraulic tube 5, a hydraulic piston 301 is slidably mounted in the inner hydraulic tube 4, the power mechanism is used for driving the hydraulic piston 301 to reciprocate along the axial direction of the inner hydraulic tube 4, the push rod resetting mechanism includes an oil storage cylinder 10 for storing hydraulic oil, a pull rod 1101 and a resetting piston 11 fixed at the front end of the pull rod 1101, the oil storage cylinder 10 is fixed on the gun body 1, reset 11 slidable mounting of piston in oil storage cylinder 10, the front end of rifle body 1 is fixed with valve body 12, oil return runner 8 has been seted up in valve body 12, oil return runner 8's outer end and oil storage cylinder 10's front end intercommunication, oil return runner 8's the inner and the position intercommunication between step-by-step piston 6 and the hydraulic piston 301, be equipped with the oil return check valve 9 that is used for preventing hydraulic oil between step-by-step piston 6 and the hydraulic piston 301 to get into oil storage cylinder 10 in the oil return runner 8, be equipped with on the valve body 12 and be used for unblock oil return check valve 9 to make the unblocked one-way unblock structure of oil return runner 8.

The tail end of the oil storage cylinder 10 is in threaded connection with a threaded sleeve 19, the front end of the threaded sleeve 19 extends into the oil storage cylinder 10, and the pull rod 1101 penetrates through the threaded sleeve 19; by rotating the screw sleeve 19, the distance between the screw sleeve 19 and the front end of the oil storage cylinder 10 is changed, so that the maximum distance of the pull rod 1101 capable of being pulled backwards is changed, and the backward movement displacement of the push rod 601 can be accurately adjusted according to the injected dose; specifically, after the position of the screw sleeve 19 is adjusted according to the next injection dose, the pull rod 1101 is pulled backward until the reset piston 11 contacts with the front end of the screw sleeve 19, thereby completing the reset of the push rod 601, when the screw sleeve 19 is screwed forward, the stroke of the pull rod 1101 is shortened, the reset displacement of the push rod 601 is small, and when the screw sleeve 19 is screwed backward, the stroke of the pull rod 1101 is lengthened, and the reset displacement of the push rod 601 is large.

An injection check valve 7 is arranged between the inner hydraulic pipe 4 and the outer hydraulic pipe 5, a first oil cavity 13 for containing hydraulic oil is formed between the hydraulic piston 301 and the injection check valve 7, a second oil cavity 14 is formed between the injection check valve 7 and the stepping piston 6, the hydraulic oil in the first oil cavity 13 can reach the second oil cavity 14 through the injection check valve 7, and the inner end of the oil return flow passage 8 is communicated with the second oil cavity 14; the injection check valve 7 prevents the hydraulic oil in the second oil chamber 14 from returning to the first oil chamber 13.

The oil return check valve 9 comprises an oil return plug 901, an oil return spring 902, a sealing ball 903 and a valve seat 904, wherein a valve hole 9041 is formed in the valve seat 904, the valve seat 904 is arranged in the oil return flow passage 8, the valve hole 9041 of the valve seat 904 is communicated with the oil return flow passage 8, the oil return plug 901 and the valve seat 904 are both fixed in the valve body 12, the oil return spring 902 and the sealing ball 903 are both positioned between the oil return plug 901 and the valve seat 904, one end of the oil return spring 902 abuts against the oil return plug 901, the other end of the oil return spring 902 abuts against the sealing ball 903, and the sealing ball 903 blocks the valve;

the one-way unlocking structure comprises a pressure relief button 15 which is slidably mounted on the valve body 12, and the pressure relief button 15 is used for pushing the sealing ball 903 to be far away from the valve seat 904;

when the pressure release button 15 is pressed inward, the pressure release button 15 pushes the sealing ball 903 away from the valve seat 904, the return spring 902 is compressed, and the sealing ball 903 releases the valve hole 9041, so that the hydraulic oil in the return flow passage 8 can flow back.

The pressure relief button 15 can rotate relative to the valve body 12, a thin section 1503 extends from one end, close to the sealing ball 903, of the pressure relief button 15, an inner arc-shaped groove 1501 and an outer arc-shaped groove 1502 are formed in the outer peripheral surface of the pressure relief button 15, the outer arc-shaped groove 1502 is located on one side, far away from the sealing ball 903, of the inner arc-shaped groove 1501, the outer arc-shaped groove 1502 is communicated with the inner arc-shaped groove 1501, a locking plate 18 is fixed in the valve body 12, the locking plate 18 is embedded into the inner arc-shaped groove 1501, the radian of the inner arc-shaped groove 1501 is smaller than that of the outer arc-shaped groove 1502, and a sealing ring 17 is arranged between the outer peripheral surface of the pressure relief button 15;

after the pressure release button 15 is pressed, the locking plate 18 relatively reaches the outer arc-shaped groove 1502, and then the locking plate 18 can be clamped in the outer arc-shaped groove 1502 by rotating the pressure release button 15, so that the pressure release button 15 is maintained in an unlocking state, the operation is convenient, and when the pressure release button 15 is not pressed, the locking plate 18 is embedded into the inner arc-shaped groove 1501, and the pressure release button 15 can be prevented from falling off the valve body 12.

The thin section 1503 is sleeved with a pressing spring 16, one end of the pressing spring 16 abuts against the valve seat 904, the other end of the pressing spring 16 abuts against the pressure relief button 15, and the arrangement of the pressing spring 16 can facilitate the reset of the pressure relief button 15 after being pressed.

In the embodiment, the power mechanism can adopt a pneumatic structure, and specifically can comprise a pneumatic piston 2, a piston cavity is arranged in a gun body 1, the pneumatic piston 2 is slidably mounted in the piston cavity, a piston rod 201 is fixed on the pneumatic piston 2, the piston rod 201 is in transmission connection with a hydraulic rod 3, a hydraulic piston 301 is fixed on the hydraulic rod 3, the piston cavity is divided into a rodless cavity 101 and a rod cavity 102 by the pneumatic piston 2, the piston rod 201 is positioned in the rod cavity 102, the gun body 1 is provided with an air inlet hole 103 and an air outlet hole 104, the air inlet hole 103 is communicated with the rodless cavity 101, and the air outlet hole 104 is communicated with the rod cavity 102; when gas is introduced into the rodless cavity 101, the pneumatic piston 2 moves forward to trigger, and the push rod 601 pushes out the liquid medicine in the medicine core 20 at the head end of the outer hydraulic pipe 5; when gas is introduced into the rod chamber 102, the pneumatic piston 2 retreats and is reset.

The resetting process of the push rod 601 is as follows:

by pressing the pressure relief button 15 inwards, the pressure relief button 15 pushes the sealing ball 903 to be far away from the valve seat 904, the oil return spring 902 is compressed, the sealing ball 903 removes the blockage of the valve hole 9041, the locking plate 18 relatively reaches the outer arc-shaped groove 1502, and then the pressure relief button 15 is rotated to enable the locking plate 18 to be clamped in the outer arc-shaped groove 1502, so that the pressure relief button 15 is maintained in an unlocked state and convenient to operate;

then pull rod 1101 is pulled backwards, reset piston 11 moves backwards to generate suction force, hydraulic oil in second oil chamber 14 reaches oil storage cylinder 10 through oil return flow passage 8, step piston 6 correspondingly realizes backward movement reset as hydraulic oil in second oil chamber 14 returns to oil storage cylinder 10, pressure relief button 15 is rotated after reset to enable inner arc-shaped groove 1501 on pressure relief button 15 to be opposite to locking plate 18, pressure relief button 15 resets under the action of pressing spring 16 after pressure relief button 15 is released, and oil return check valve 9 recovers the function of preventing hydraulic oil in second oil chamber 14 from entering oil storage cylinder 10.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (6)

1. The utility model provides a push rod canceling release mechanical system of needleless injector, needleless injector includes rifle body (1), outer hydraulic pressure pipe (5), interior hydraulic pressure pipe (4) and power unit, interior hydraulic pressure pipe (4) are fixed in rifle body (1), outer hydraulic pressure pipe (5) are fixed at the front end of rifle body (1), and the tail end of outer hydraulic pressure pipe (5) and the head end of interior hydraulic pressure pipe (4) communicate, are equipped with push rod (601) that are used for the injection in outer hydraulic pressure pipe (5), the tail end on push rod (601) is fixed with step-by-step piston (6), and step-by-step piston (6) slidable mounting is in outer hydraulic pressure pipe (5), slidable mounting has hydraulic piston (301) in interior hydraulic pressure pipe (4), power unit is used for driving hydraulic piston (301) along the axis direction reciprocating motion of interior hydraulic pressure pipe (4), its characterized in that: the push rod resetting mechanism comprises an oil storage cylinder (10) for storing hydraulic oil, a pull rod (1101) and a resetting piston (11) fixed at the front end of the pull rod (1101), the oil storage cylinder (10) is fixed on the gun body (1), the reset piston (11) is slidably arranged in the oil storage cylinder (10), a valve body (12) is fixed at the front end of the gun body (1), an oil return flow passage (8) is arranged in the valve body (12), the outer end of the oil return flow passage (8) is communicated with the front end of the oil storage cylinder (10), the inner end of the oil return flow passage (8) is communicated with the position between the stepping piston (6) and the hydraulic piston (301), an oil return one-way valve (9) for preventing the hydraulic oil between the stepping piston (6) and the hydraulic piston (301) from entering the oil storage cylinder (10) is arranged in the oil return flow passage (8), and a one-way unlocking structure for unlocking the oil return one-way valve (9) to enable the oil return flow passage (8) to be smooth is arranged on the valve body (12).

2. The plunger return mechanism for a needleless injector of claim 1, wherein: the tail end of the oil storage cylinder (10) is in threaded connection with a threaded sleeve (19), the front end of the threaded sleeve (19) extends into the oil storage cylinder (10), and the pull rod (1101) penetrates through the threaded sleeve (19).

3. The plunger return mechanism for a needleless injector of claim 1, wherein: be equipped with injection check valve (7) between interior hydraulic pressure pipe (4) and outer hydraulic pressure pipe (5), form first oil pocket (13) that hold hydraulic oil between hydraulic piston (301) and injection check valve (7), form second oil pocket (14) between injection check valve (7) and step-by-step piston (6), hydraulic oil in first oil pocket (13) can reach second oil pocket (14) through injection check valve (7), the inner and second oil pocket (14) intercommunication of oil return runner (8).

4. The plunger return mechanism for a needleless injector of claim 3, wherein: the oil return check valve (9) comprises an oil return plug (901), an oil return spring (902), a sealing ball (903) and a valve seat (904), a valve hole (9041) is formed in the valve seat (904), the valve seat (904) is arranged in the oil return flow passage (8), the valve hole (9041) of the valve seat (904) is communicated with the oil return flow passage (8), the oil return plug (901) and the valve seat (904) are both fixed in the valve body (12), the oil return spring (902) and the sealing ball (903) are both located between the oil return plug (901) and the valve seat (904), one end of the oil return spring (902) abuts against the oil return plug (901), the other end of the oil return spring abuts against the sealing ball (903), and the sealing ball (903) blocks the valve hole (9041);

the one-way unlocking structure comprises a pressure relief button (15) which is slidably mounted on the valve body (12), and the pressure relief button (15) is used for pushing the sealing ball (903) to be far away from the valve seat (904).

5. The plunger return mechanism for a needleless injector of claim 4, wherein: pressure release button (15) can rotate relative valve body (12), the one end that pressure release button (15) is close to ball sealer (903) extends there is thin section (1503), interior arc wall (1501) and outer arc wall (1502) have been seted up on the outer peripheral face of pressure release button (15), outer arc wall (1502) are located the one side of keeping away from ball sealer (903) of interior arc wall (1501), outer arc wall (1502) and interior arc wall (1501) intercommunication, valve body (12) internal fixation has locking plate (18), locking plate (18) are embedded into in interior arc wall (1501), the radian of interior arc wall (1501) < the radian of outer arc wall (1502), be equipped with between the outer peripheral face of pressure release button (15) and valve body (12) sealing washer (17).

6. The plunger return mechanism for a needleless injector of claim 5, wherein: the thin section (1503) is sleeved with a pressing spring (16), one end of the pressing spring (16) abuts against the valve seat (904), and the other end of the pressing spring (16) abuts against the pressure relief button (15).

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