CN218847726U - Quantitative medical valve - Google Patents

Abstract

A quantitative medical valve solves the technical problem that the existing automatic sampling device is complex in structure and poor in practicability. The push rod assembly extends into the installation cavity from an opening of the installation cavity and forms an accommodating cavity with the installation cavity, two connecting ports are formed in the other end of the installation cavity, each connecting port is respectively communicated with a liquid circulation channel, a one-way valve is arranged in each liquid circulation channel, each one-way valve comprises a flow guide piece which is fixed in the liquid circulation channel and provided with a plurality of liquid flow guide grooves and a diaphragm which is movably arranged on one side of the flow guide piece and driven by the electromagnetic drive assembly and used for plugging the corresponding liquid circulation channel, and the two flow guide pieces are oppositely arranged so that the two liquid circulation channels are alternately opened; the medical valve realizes quantification, and has simple structure and good practicability. The utility model discloses mainly used medical valve production technical field.

Description

Quantitative medical valve

Technical Field

The utility model relates to a medical valve production technical field, concretely relates to ration medical valve.

Background

When medical science detected, often need carry out quantitative sample to liquid, when actual operation, medical personnel all adopted the sampling device who possesses the scale to sample or adopt and possess quantitative volumetric device to sample usually, then detected in the corresponding check out test set with the sample application sample of drawing out again, when need carry out a lot of sample to a sample and do parallel experiment, just need sample repeatedly, the application of sample, repeated sample and application of sample can lead to whole sample work to become loaded down with trivial details.

It is therefore desirable to have a device that facilitates quantitative sampling to liberate manpower.

The sampling mechanism of the existing full-automatic specific protein analyzer with the publication number of CN205720275U realizes sampling through a driving mechanism, but the whole device has a complex structure and poor practicability.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the purpose is to prior art not enough, releases a ration medical valve, has solved the complicated technical problem that leads to its relatively poor practicality of current automatic sampling device structure.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a quantitative medical valve, includes and is provided with the first valve body of installation cavity by electromagnetic drive assembly driven push rod subassembly and one end, push rod subassembly follows the opening of installation cavity stretches into in the installation cavity and with the installation cavity forms and holds the cavity, two connectors are seted up to the other end of installation cavity, every the connector is equallyd divide and is do not communicate a liquid circulation passageway, and every all set up a check valve in the liquid circulation passageway, check valve is including fixing the water conservancy diversion spare and the activity setting of taking a plurality of liquid guiding gutters in the liquid circulation passageway are in water conservancy diversion spare one side by electromagnetic drive assembly driven is used for the diaphragm that the shutoff corresponds liquid circulation passageway, two the water conservancy diversion spare sets up so that two liquid circulation passageway opens in turn.

The diaphragm is fixed in the first flow guide cavity, one of the flow guide members is fixed in the first flow guide cavity, the diaphragm corresponding to the flow guide member is arranged between the flow guide member and the second valve body, and the other flow guide member is fixed in the second flow guide cavity, and the diaphragm corresponding to the flow guide member is arranged between the flow guide member and the first valve body.

Furthermore, a first liquid input channel and a first liquid output channel are formed in the first valve body, a second liquid input channel and a second liquid output channel are formed in the second valve body, the second liquid input channel is communicated with the first liquid input channel to form a liquid circulation channel, the second liquid output channel is communicated with the first liquid output channel to form the liquid circulation channel, the flow guide element in the first valve body is fixed at one end, far away from the accommodating chamber, of the first liquid input channel, and the flow guide element in the second valve body is fixed at one end, close to the accommodating chamber, of the second liquid output channel.

Further, the water conservancy diversion spare includes the backing sheet of a plurality of V types, and is a plurality of the backing sheet is circular arranging, arbitrary adjacent two form one between the backing sheet the guiding gutter, the one end of backing sheet is fixed and is corresponded first valve body or on the second valve body, the other end of backing sheet is the inclined plane and leans out along the first water conservancy diversion chamber in its place or the center in second water conservancy diversion chamber, and is a plurality of this inclined plane of backing sheet makes the water conservancy diversion spare is close to the terminal surface of diaphragm is convex surface structure, and then makes the diaphragm butt can not with when the water conservancy diversion spare is last the guiding gutter blocks up.

Furthermore, a first positioning hole and two first mounting holes symmetrically arranged at two sides of the first valve body are further formed in the first valve body, and a second positioning hole communicated with the first positioning hole and two second mounting holes respectively communicated with the first mounting holes are further formed in the second valve body.

Furthermore, the electromagnetic driving assembly comprises a coil support, a coil arranged outside the coil support, a valve core arranged in the coil support and an armature arranged below the valve core, and the push rod assembly is assembled on the armature, so that the armature drives the push rod assembly to move up and down under the condition that the coil is alternately switched on and off to complete primary quantitative liquid pumping and liquid discharging.

Furthermore, the push rod assembly comprises a push rod driven by the electromagnetic driving assembly, an adjusting spring fixed at one end of the push rod and located in the valve core, a connecting rod assembled at the other end of the push rod, and a liquid blocking sheet fixed on the connecting rod, wherein the adjusting spring is in a compressed state when located at an initial position.

Furthermore, it includes curved flexible liquid-blocking piece to hinder the liquid piece, still be fixed with the clamping ring in the holding chamber, the outside of clamping ring with the inner wall butt that holds the chamber, flexible liquid-blocking piece sets up in the clamping ring just the outward flange that flexible liquid-blocking piece was with the inner wall butt of clamping ring to prevent that liquid from inputing in the electromagnetic drive subassembly.

Further, the liquid blocking piece comprises a rigid liquid blocking piece, and the outer edge of the rigid liquid blocking piece is abutted against the inner wall of the accommodating chamber so as to prevent liquid from being input into the electromagnetic driving assembly.

The beneficial effects of the utility model are that:

the utility model relates to a ration medical valve, through electromagnetic drive subassembly control push rod subassembly in order to accomplish liquid quantitative sampling and application of sample, it is concrete, the installation cavity forms a cavity that holds that is used for holding liquid with push rod subassembly, two connectors of installation cavity one side are connected with a liquid circulation passageway respectively, all set up a water conservancy diversion spare in every liquid circulation passageway, the water conservancy diversion spare sets up relatively in two liquid circulation passageways, the water conservancy diversion spare of two relative settings can make two corresponding liquid circulation passageways be in the state of opening in electromagnetic drive subassembly's action one, another then is in closed state, accomplish extraction or the application of liquid of a ration liquid promptly in push rod subassembly's a stroke promptly, the simple structure of water conservancy diversion spare, electromagnetic drive subassembly's structure is also comparatively simple, only need to accomplish through the electromagnetic drive subassembly when having realized the quantitative sampling to liquid in this medical valve's structure, the operation of control electromagnetic drive subassembly is comparatively simple, whole sampling, the manpower has been liberated in-process of application of sample, the practicality is better.

Drawings

FIG. 1 is a perspective view of a medical valve according to a first embodiment of the present invention;

FIG. 2 is an exploded view of a medical valve according to one embodiment;

FIG. 3 is an enlarged view of the detail A in FIG. 2;

FIG. 4 is a top view of a medical valve according to one embodiment;

FIG. 5 is a cross-sectional view taken at B-B of FIG. 4;

FIG. 6 is an enlarged structural view of a portion C of FIG. 5;

FIG. 7 is a sectional view of the second embodiment;

FIG. 8 is an enlarged structural view of a portion D of FIG. 7;

FIG. 9 is an enlarged view of a portion E of FIG. 8;

FIG. 10 is a partial view of the diaphragm contacting the baffle of the first embodiment;

description of reference numerals:

1. an electromagnetic drive assembly; 11. a valve housing; 12. a coil support; 13. a valve core; 14. a snap ring; 15. an armature; 16. pressing a ring nut; 17. a connecting rod; 18. a liquid blocking sheet; 18a, a flexible liquid blocking sheet; 18b, a rigid liquid-blocking sheet; 19. pressing a ring; 19-1, a guide ring;

2. a first valve body; 20. a first flow guide cavity; 21. a mounting cavity; 21-1, a containment chamber; 22. a first positioning hole; 23. a first mounting hole; 24. a first liquid output channel; 25. a first liquid input channel;

3. a second valve body; 31. a second diversion cavity; 32. a second positioning hole; 33. a second mounting hole; 34. a second liquid output channel; 35. a second liquid input channel;

4. a membrane;

5. a flow guide member; 51. a support sheet; 52. a diversion trench;

6. adjusting the spring;

7. a coil;

8. a push rod.

Detailed Description

The technical solution of the present invention will be further explained with reference to fig. 1-10 and the embodiments.

As shown in fig. 1-4, a quantitative medical valve comprises a push rod assembly driven by an electromagnetic driving assembly 1 and a first valve body 2 with one end provided with a mounting cavity 21, the push rod assembly is connected in the mounting cavity 21 in a sliding manner from an opening on the side of the mounting cavity 21 and forms a containing cavity 21-1 for containing liquid with the mounting cavity, the other end of the mounting cavity 21 is provided with two connecting ports, each connecting port is respectively communicated with a liquid flowing channel, a one-way valve for controlling the opening and closing of the liquid flowing channel is arranged in each liquid flowing channel, the one-way valve comprises a flow guide member 5 with a plurality of liquid flow guide grooves 52 arranged in the corresponding liquid flowing channel and a diaphragm 4 movably arranged on one side of the flow guide member 5 and driven by the electromagnetic driving assembly 1 for blocking the liquid flowing channel, and the two flow guide members 5 are oppositely arranged so that the two liquid flowing channels are alternately opened.

The application designs a ration medical valve can accomplish the extraction work of the quantitative liquid of holding cavity 21-1 through simple structure's check valve and an electromagnetic drive subassembly 1, and the cost is low and liberated the manpower simultaneously greatly, and the practicality is good.

Example one

As shown in fig. 5 to 6 and fig. 10, the quantitative medical valve includes an electromagnetic driving unit 1, a first valve body 2, and a second valve body 3, which are arranged in this order from top to bottom.

The electromagnetic driving assembly 1 comprises a valve casing 11, a coil 7, a coil support 12 and a valve core 13 which are sequentially arranged from outside to inside, and further comprises a snap ring 14 and an armature 15 which are arranged below the coil 12 and sequentially arranged from top to bottom, the armature 15 is assembled in the valve core 13 in a sliding mode, and the snap ring 14 is sleeved on the valve core 13 and is located between the coil 12 and the armature 15.

The first valve body 2 is assembled at the lower end of the valve casing 11, a pressure ring nut 16 and a push rod 8 are sequentially arranged in the first valve body 2 from outside to inside, the push rod 8 is fixedly arranged on the armature 15, and the pressure ring nut 16 enables the accommodating chamber 21-1 to form a completely sealed structure.

The valve core 13 is internally provided with a groove structure, the groove structure of the valve core 13 is internally provided with an adjusting spring 6, the push rod 8 is also arranged in the groove structure of the valve core 13, one end of the push rod 8 is fixed on the adjusting spring 6, the other end of the push rod 8 is assembled with a connecting rod 17 through threads, and the free end of the connecting rod 17 is fixedly provided with a liquid blocking sheet 18.

The liquid blocking sheet 18 comprises a flexible liquid blocking sheet 18a, the flexible liquid blocking sheet 18a is of an arc-shaped sheet structure, a pressing ring 19 is arranged outside the flexible liquid blocking sheet 18a, the pressing ring 19 abuts against the inner wall of the accommodating cavity 21-1, and the outer edge of the flexible membrane 4 abuts against the inner wall of the pressing ring 19.

When the push rod 8 moves in a direction far away from the accommodating chamber 21-1 along the axial direction of the push rod 8 under the driving of the electromagnetic driving assembly 1, namely, when liquid is pumped, the middle part of the flexible liquid-blocking sheet 18a can be pulled by the push rod 8 so that the flexible liquid-blocking sheet 18a becomes an umbrella-shaped structure, namely, the outer edge of the flexible liquid-blocking sheet 18a is relatively deviated towards the central position thereof, but the flexible liquid-blocking sheet 18a is in an arc shape, so that the deviation can be compensated, and the outer edge of the flexible liquid-blocking sheet 18a is always kept in a state of being completely abutted against the inner wall of the pressing ring 19 in the whole liquid pumping process so as to prevent liquid leakage.

The pressing ring nut 16 is fixed on the mounting cavity 21, the pressing ring 19 is fixed on the pressing ring nut 16, the guide ring 19-1 is arranged in the pressing ring 19 in a sliding mode, the outer diameter of the guide ring 19-1 is equal to the inner diameter of an opening of the pressing ring 19, namely the outer wall of the pressing ring 19-1 abuts against the inner wall of the opening of the pressing ring 19, the push rod 8 drives the flexible liquid blocking sheet 18a to move upwards in each action of the electromagnetic driving assembly 1, meanwhile, the flexible liquid blocking sheet 18a can push the guide ring 19-1 to move upwards along the axial direction of the connecting rod 17 until the upper end face of the flexible liquid blocking sheet 18a abuts against the pressing ring 19, the flexible liquid blocking sheet 18a cannot move upwards any more under the blocking of the pressing ring 19, the accommodating cavity 21-1 formed by the pressing ring nut 16, the pressing ring 19 and the mounting cavity 21 reaches the maximum volume, the maximum volume of the accommodating cavity 21-1 is determined uniquely, and the electromagnetic driving assembly 1 drives the flexible liquid blocking sheet 18a to move to the maximum stroke to achieve the maximum volume function of the quantitative accommodating cavity 21-1 in each action.

Under the condition of once power-on of the electromagnetic driving assembly 1, because the armature 15 is driven to move upwards by the principle of electromagnetic induction so as to drive the flexible liquid-blocking sheet 18a to move, after the electromagnetic driving assembly 1 is powered off once, the adjusting spring 6 in a compressed state can push the push rod 8 to move downwards so as to push the flexible liquid-blocking sheet 18a to abut against the bottom of the mounting cavity 21, so that the liquid in the accommodating cavity 21-1 is completely discharged.

The accommodating chamber 21-1 is provided with two connecting ports, one is a liquid inlet and the other is a liquid outlet.

The liquid inlet is communicated with a liquid circulation channel, the liquid circulation channel comprises a first liquid input channel 25 arranged in the first valve body 2 and a second liquid input channel 35 arranged in the second valve body 3, the first liquid input channel 25 is communicated with the second liquid input channel 35, the second liquid input channel 35 penetrates through the second valve body 3, and liquid sequentially passes through the second liquid input channel 35 and the first liquid input channel 25 and then enters the accommodating chamber 21-1.

The liquid outlet is communicated with a liquid circulation channel, the liquid circulation channel comprises a first liquid output channel 24 arranged in the first valve body 2 and a second liquid output channel 34 arranged in the second valve body 3, the first liquid output channel 24 is communicated with the second liquid output channel 34, the second liquid output channel 34 penetrates through the second valve body 3, and liquid sequentially passes through the first liquid output channel 24 and the second liquid output channel 34 to discharge the liquid in the accommodating cavity 21-1.

The end part of the first valve body 2 close to the second valve body 3 is further provided with a first flow guide cavity 20, the first flow guide cavity 20 is communicated with a first liquid input channel 25, a flow guide part 5 is fixed in the first flow guide cavity 20, the flow guide part 5 comprises a plurality of V-shaped support sheets 51, the plurality of V-shaped support sheets 51 are arranged along the circumferential direction of the orifice of the first liquid input channel 25, a flow guide groove 52 is formed between any two adjacent support sheets 51, the flow guide groove 52 is communicated with the first liquid input channel 25, one side end face of each support sheet 51 is fixed on the inner wall of the first flow guide cavity 20, the other end face of each support sheet 51 is an inclined face structure and inclines outwards along the center of the first flow guide cavity 20, namely, the inclined faces of the plurality of support sheets 51 enable the end faces of the flow guide part 5 to form a structure protruding towards the direction close to the second valve body 3.

The first flow guide cavity 20 is also movably provided with a diaphragm 4, the diaphragm 4 is a sheet structure made of rubber, the diaphragm 4 is arranged at the end part of the protruding structure of the flow guide piece 5, the diameter of the diaphragm 4 is larger than the size of the pipe orifice of the second liquid input channel 35 and is 3-5 times of the diameter of the pipe orifice, when the corresponding liquid circulation channel is opened, the middle part of the diaphragm 4 is contacted with the protruding end surface of the flow guide piece 5, the periphery of the diaphragm 4 is not contacted with the flow guide piece 5 so as to prevent the diaphragm 4 from blocking the flow guide groove 52, thus the liquid circulation is smooth, and the second liquid input channel 35 can be completely blocked.

The end part of the second valve body 3 close to the first valve body 2 is provided with a second flow guide cavity 31, the second flow guide cavity 31 is communicated with a second liquid output channel 34, a flow guide piece 5 is also arranged in the second flow guide cavity 31, one end of the flow guide piece 5 is fixed on the inner wall of the second flow guide cavity 31, a diaphragm 4 is movably installed on the outer side of the protruding end part of the flow guide piece 5, the diameter of the diaphragm 4 is smaller than the diameter of the pipe orifice of the first liquid output channel 24 and is 3-5 times of the diameter of the pipe orifice, and the action of the diaphragm is completely the same as that of the diaphragm 4 in the first valve body 2.

The first valve body 2 is further provided with a first positioning hole 22 and two first mounting holes 23 symmetrically arranged at two sides of the first valve body 2.

The second valve body 3 further has a second positioning hole 32 communicating with the first positioning hole 22 and second mounting holes 33 respectively communicating with the two first mounting holes 23.

During installation, the pin shaft is inserted into the first positioning hole 22 or the second positioning hole 32, the second positioning hole 32 or the first positioning hole 22 is sleeved on the pin shaft to determine the relative position when the first valve body 2 and the second valve body 3 are installed, then the screws respectively penetrate through the two groups of the first installation hole 23 and the second installation hole 33 which are respectively communicated, and the first valve body 2 is assembled on the second valve body 3.

Example two

As shown in fig. 7-10, the liquid-blocking piece 18 includes a hard liquid-blocking piece 18b, and the outer edge of the hard liquid-blocking piece 18b abuts on the inner wall of the accommodation chamber 21-1; the configuration is exactly the same as that in the first embodiment, except that the liquid blocking sheet is a rigid liquid blocking sheet 18b, the pressing ring 19 is not provided on the periphery of the rigid liquid blocking sheet 18b, and the pressing ring nut 16 is provided in abutment with the rigid liquid blocking sheet 18b so that the housing chamber 21-1 constitutes a closed chamber structure.

After the electromagnetic driving assembly 1 is electrified once, the push rod 8 is driven to move upwards so as to drive the rigid liquid resistance sheet 18b to move upwards until the rigid liquid resistance sheet 18b is abutted to the pressure ring nut 16, and at the moment, the accommodating chamber 21-1 formed by the pressure ring nut 16 and the installation cavity 21 also achieves the maximum volume so as to achieve the quantitative purpose.

After the electromagnetic driving assembly 1 is powered off once, the adjusting spring 6 pushes the push rod 8 to drive the rigid liquid resisting sheet 18b to abut against the bottom of the mounting cavity 21 so as to enable the liquid in the accommodating cavity 21-1 to be completely discharged.

The working principle is as follows: when the quantitative medical valve designed by the application is used, the medical valve is assembled, then the second liquid input channel 35 of the second medical valve body 3 is communicated with the liquid needing quantitative extraction, and the second liquid output channel 34 is communicated with the corresponding container, when the medical valve is ready for use, the power supply is switched on, the electromagnetic driving component 1 is repeatedly started to completely exhaust the air in the medical valve so that the interior of the medical valve is in a vacuum state, then the power supply is switched on again, the electromagnetic driving component 1 drives the push rod 8 to move along the axial direction of the push rod in a direction away from the accommodating chamber 21-1, and due to the fact that the interior of the medical valve is in the vacuum state, in the process of continuing to move the push rod 8, the membrane 4 in the first flow guide cavity 20 also moves towards the direction close to the flow guide part 5 until the membrane is attached to the convex end face of the flow guide part 5, namely, at this time, the second liquid input channel 35 is opened, and at the same time, the diaphragm 4 in the second diversion cavity 31 moves towards the direction away from the diversion member 5 until the first liquid output channel 24 is blocked, the push rod 8 continues to move to drive the liquid blocking piece 18 to rise to the maximum position, and at this time, the accommodating chamber 21-1 reaches the maximum liquid volume, namely, the purpose of quantitative extraction is achieved, the power supply is cut off, the adjusting spring 6 drives the push rod 8 to move towards the direction close to the accommodating chamber 21-1 along the axial direction until the push rod abuts against the bottom of the mounting chamber 21, the diaphragm 4 in the first diversion chamber 20 and the diaphragm 4 in the second diversion chamber 31 both move along with the push rod so that the second liquid input channel 35 is blocked while the first liquid output channel 24 is opened, and the liquid in the accommodating chamber 21-1 is completely discharged; the medical valve is simple in structure, low in manufacturing cost and easy to operate when quantitative liquid extraction is achieved, manpower is greatly liberated, and practicability is good.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims (9)

1. The utility model provides a ration medical valve, includes and is provided with first valve body (2) of installation cavity (21) by electromagnetic drive subassembly (1) driven push rod subassembly and one end, its characterized in that, push rod subassembly follows the opening of installation cavity (21) stretches into in installation cavity (21) and with installation cavity (21) form and hold cavity (21-1), two connectors are seted up to the other end of first valve body (2), every the connector is equallyd divide and is communicate a liquid flow channel respectively, and every all set up a check valve in the liquid flow channel, check valve is including fixing water conservancy diversion spare (5) and the activity of taking a plurality of liquid guiding gutters (52) in the liquid flow channel are set up water conservancy diversion spare (5) one side by electromagnetic drive subassembly (1) driven is used for the shutoff to correspond diaphragm (4) of liquid flow channel, two water conservancy diversion spare (5) set up relatively so that two the liquid flow channel opens in turn.

2. A metered dose medical valve according to claim 1, further comprising a second valve body (3), wherein the second valve body (3) is assembled to the first valve body (2), a first flow guiding cavity (20) is formed in the first valve body (2), a second flow guiding cavity (31) is formed in the second valve body (3), one of the flow guiding members (5) is fixed in the first flow guiding cavity (20) and the corresponding one of the diaphragms (4) of the flow guiding member (5) is disposed between the flow guiding member (5) and the second valve body (3), and the other one of the flow guiding members (5) is fixed in the second flow guiding cavity (31) and the corresponding one of the diaphragms (4) of the flow guiding member (5) is disposed between the flow guiding member (5) and the first valve body (2).

3. A quantitative medical valve according to claim 2, wherein the first valve body (2) further comprises a first liquid inlet channel (25) and a first liquid outlet channel (24), the second valve body (3) further comprises a second liquid inlet channel (35) and a second liquid outlet channel (34), the second liquid inlet channel (35) and the first liquid inlet channel (25) are communicated to form the liquid flow channel, the second liquid outlet channel (34) and the first liquid outlet channel (24) are communicated to form the liquid flow channel, the flow guide member (5) in the first valve body (2) is fixed to the end of the first liquid inlet channel (25) far away from the accommodating chamber (21-1), and the flow guide member (5) in the second valve body (3) is fixed to the end of the second liquid outlet channel (34) near the accommodating chamber (21-1).

4. A metered dose medical valve according to claim 3, wherein the flow guide member (5) comprises a plurality of support plates (51) having a V shape, the plurality of support plates (51) are arranged in a circular shape, one flow guide groove (52) is formed between any two adjacent support plates (51), one end of each support plate (51) is fixed on the corresponding first valve body (2) or second valve body (3), the other end of each support plate (51) is an inclined surface and is inclined outwards along the center of the first flow guide cavity (20) or second flow guide cavity (31) where the support plate is located, and the inclined surface of the plurality of support plates (51) enables the end surface of the flow guide member (5) close to the diaphragm (4) to be a convex structure, so that the diaphragm (4) does not block the flow guide groove (52) when abutting on the flow guide member (5).

5. A quantitative medical valve according to any of claims 2-4, characterized in that a first positioning hole (22) and two first mounting holes (23) symmetrically arranged at both sides of the first valve body (2) are further arranged in the first valve body (2), and a second positioning hole (32) communicating with the first positioning hole (22) and two second mounting holes (33) communicating with the two first mounting holes (23) respectively are further arranged in the second valve body (3).

6. A quantitative medical valve according to claim 5, characterized in that the electromagnetic driving component (1) comprises a coil support (12), a coil (7) arranged outside the coil support (12), a valve core (13) arranged in the coil support (12) and an armature (15) arranged below the valve core (13), and the push rod component is assembled on the armature (15), so that the armature (15) drives the push rod component to move up and down under the condition that the coil (7) is alternately switched on and off to complete the liquid extraction and drainage of a fixed amount.

7. A metered dose medical valve according to claim 6, wherein the push rod assembly comprises a push rod (8) driven by the electromagnetic drive assembly (1), an adjusting spring (6) fixed at one end of the push rod (8) and located in the valve core (13), a connecting rod (17) assembled at the other end of the push rod (8), and a liquid blocking piece (18) fixed on the connecting rod (17), wherein the adjusting spring (6) is in a compressed state when located at an initial position.

8. The quantitative medical valve according to claim 7, wherein the liquid blocking sheet (18) comprises an arc-shaped flexible liquid blocking sheet (18 a), a pressing ring (19) is further fixed in the accommodating chamber (21-1), the outer side of the pressing ring (19) is abutted to the inner wall of the accommodating chamber (21-1), the flexible liquid blocking sheet (18 a) is arranged in the pressing ring (19) and the outer edge of the flexible liquid blocking sheet (18 a) is abutted to the inner wall of the pressing ring (19) so as to prevent liquid from being input into the electromagnetic driving assembly (1).

9. A metered dose medical valve according to claim 8, wherein the liquid blocking flap (18) comprises a rigid liquid blocking flap (18 b), the outer edge of the rigid liquid blocking flap (18 b) abutting the inner wall of the containment chamber (21-1) to prevent the input of liquid into the electromagnetic drive assembly (1).

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