WO2012174754A1

WO2012174754A1 - Dosing pump device

Info

Publication number: WO2012174754A1
Application number: PCT/CN2011/076496
Authority: WO
Inventors: 姚斌
Original assignee: Yao Bin
Priority date: 2011-06-20
Filing date: 2011-06-28
Publication date: 2012-12-27
Also published as: CN102358463B; CN102358463A

Abstract

A dosing pump device comprises a liquid storage container (1) having a first chamber (13), a dosing container (2) having a dosing chamber (24), a delivery groove (31), and a pump structure (4) comprising a pump structure chamber (34) and a piston (41). The dosing container (2) is sealingly connected with the liquid storage container (1), the delivery groove (31) and the pump structure (4), respectively. The dosing chamber (2) communicates with one of the first chamber (13), the delivery groove (31) and the pump structure (4). The device also comprises an air vent (11). The dosing container (2) communicates with the atmosphere through the air vent (11) in a state where the dosing chamber (24) communicates with the delivery groove (31). The dosing pump device can suck and deliver liquid under the sealing condition and residual liquid will not remain in the dosing pump device.

Description

Quantitative pump device

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a metering pump apparatus, and more particularly to a metering pump apparatus for micro-quantitative output that completely discharges liquid in isolation from the outside. Background technique

In medical tests, especially immunochemical tests involving biological agents, because the reagents are expensive and vulnerable to external pollution, they need to be completely isolated from the outside during storage and use to prevent them from contacting the outside air and dust. Deterioration, therefore, when using such a reagent, there is a need for a device that is capable of micro-quantitative output and that can be completely sealed.

A fluid output device as described in DE 10049898 C2, which operates without a gas balance using a metering pump, outputs the liquid from the container into an internal bag that is sealed relative to the surrounding environment. However, when the liquid is filled into the inner bag, residual air remains in the inner bag, resulting in shortened storage time or contamination. Patent No. 200510066266.7 discloses a device for performing a metering pump to take a liquid using a plunger principle and two unidirectional wide structures, which utilizes a metering pump structure to draw residual air remaining in a filling container, but such a device accesses a liquid container It must be a flexible material, and there will be residual liquid in the container during fluid storage or guiding, which is not suitable for the trace of fluid. During the guiding process, it is also possible that the fluid in the container is exposed to the air, causing contamination. Summary of the invention

In view of the deficiencies of the prior art, it is an object of the present invention to provide a metering pump apparatus capable of guiding a trace amount of liquid while being isolated from the outside.

The technical solution of the present invention is as follows:

A quantitative pump device comprising a liquid storage container having a first volume; a quantitative container having a certain volume of volume; a lead-out groove; a pump structure comprising a pump structure chamber and a piston, the pump structure chamber containing the piston And sealingly connected to the piston; the quantitative container is sealingly connected to the liquid storage container, the lead-out tank and the pump structure, respectively, and the quantitative volume is connected to the first volume, the outlet groove and the pump structure. The utility model further comprises a venting hole, wherein the venting hole communicates with the outside through the vent hole in a state in which the quantitative cavity is in communication with the lead-out groove.

Further, the lead-out groove and the pump structure chamber are disposed on a seat, and the support seat is sealingly connected to the bottom surface of the quantitative container; the bottom end of the side surface of the pump structure cavity has a limiting device protruding inward.

Further, the pump structure further includes: a piston through hole is disposed on a top surface of the pump structure cavity, and the pump structure cavity communicates with the quantitative cavity through the piston through hole in a state in which the pump structure cavity communicates with the quantitative cavity;

a piston boss disposed on the top surface of the piston and corresponding to the through hole of the piston;

The piston cavity is disposed in the piston, the bottom of the piston is open, the top mask has a venting through hole, and the bottom portion has a first wedge-shaped protrusion;

The inner sleeve of the piston is disposed in the piston cavity, and has an inner sleeve cavity with an open bottom surface, and a second wedge-shaped protrusion corresponding to the first wedge-shaped protrusion is disposed at the top of the side surface;

The pull rod is accommodated in the inner sleeve cavity, and the upper portion is connected to the piston inner sleeve through the spring pin, and has a pull rod through hole penetrating through the top surface and the bottom surface;

a piston spring is disposed in the pump structure cavity to surround the piston inner sleeve and the pull rod, the upper end is in contact with the bottom surface of the piston, and the lower end is in contact with the limiting device;

The inner sleeve spring is disposed in the inner sleeve cavity, the upper end is in contact with the top surface of the inner sleeve cavity, and the lower end is in contact with the top surface of the tie rod; further, a lotus-like structure and an annular ring are further included, and the lotus-shaped structure is rotated by the rotary pair Connected to the annular ring, the annular ring is fixed in the annular groove at the bottom of the lead-out groove.

Further, the top surface of the first cavity is sealed with the side surface, the bottom surface has a downward recessed area and a vertically downward guiding groove, and one end of the guiding groove is open at the lowest point of the recessed area; the bottom of the liquid storage container The second cavity having a bottom opening, the top surface of the second cavity is communicated with the first cavity through the guiding groove, the side is provided with the vent hole, and the second cavity contains the quantitative container.

Further, the top surface of the quantitative container has a first sinking station, the guiding groove has an extending section facing downward from the top of the second cavity, the extending section is in contact with the first sinking table; It is arranged in the first sinking table and penetrates the top surface and the bottom surface.

Further, the center of the top surface of the quantitative container has an upper rotating shaft, and the top surface of the second chamber has an upper rotating groove that cooperates with the upper rotating shaft; the center of the bottom surface of the quantitative container has a coaxiality with the upper rotating shaft a lower rotating shaft, the top surface of the support has a lower rotating groove that cooperates with the lower rotating shaft.

Preferably, the quantitative container is also sealingly connected to the bracket and the liquid storage container by a moving pair.

Further, the utility model further comprises a jacket structure, the jacket structure has a top open jacket cavity, and a symmetrical outer casing protrusion is arranged on an upper side of the inner side; the jacket container surrounds the support and the quantitative container, and the outlet groove is led from the outer casing The first cover through hole of the bottom surface of the cavity protrudes; the bottom of the pull rod is fixedly connected with the bottom surface of the outer casing, and the second outer cover through hole is provided at the connection position, and the pull rod through hole communicates with the outside through the second outer cover through hole.

Further, a rotary handle is further disposed, the rotating handle is fixedly connected to the side of the quantitative container under the first sinking table; the side of the second cavity is provided with an open slot, and the rotating handle protrudes from the open slot; A side surface of the jacket cavity is provided with a spiral groove corresponding to the rotating handle, and the rotating handle is embedded in the spiral groove. Compared with the prior art, the present invention adopts a vacuum which is connected to the pump structure by the quantitative container, and then receives the liquid from the first volume of the liquid storage container and then discharges it from the outlet groove of the support. The entire guiding process is completed in a completely closed device to prevent external contamination of the liquid, and after the liquid is discharged, there is no residual liquid in the quantitative container, which is suitable for the introduction of trace liquid. DRAWINGS

1 is a schematic view showing the structure of a first embodiment of a metering pump device of the present invention.

Fig. 2 is a cross-sectional view showing the liquid storage container 1 in the embodiment of Fig. 1.

Fig. 3 is a schematic view showing the structure of the quantitative container 2 in the embodiment of Fig. 1.

Figure 4 is a schematic view showing the structure of the holder 3 in the embodiment of Figure 1.

Figure 4a is a cross-sectional view of the holder 3 shown in Figure 4 .

Figure 5 is a schematic view showing the structure of the pump structure 4 in the embodiment of Figure 1.

Figure 6 is a cross-sectional view of the piston 41 of the pump construction of Figure 4.

Figure 7 is a cross-sectional view of the piston inner sleeve 42 of the pump configuration of Figure 5.

Figure 8 is a schematic view showing the structure of the outer casing structure 5 in the embodiment of Figure 1.

Figure 9 is a cross-sectional view showing the state of the embodiment A shown in Figure 1.

Figure 10 is a cross-sectional view showing the state of the embodiment B shown in Figure 1.

Figure 1 is a cross-sectional view of the embodiment of Figure 1 in a C state.

Figure 12 is a schematic view showing the structure of a second embodiment of the metering pump device of the present invention.

In the picture:

1 a liquid storage container; 1 1 a venting hole; 1 2 - upper rotating groove; 1 3 - first cavity; 131 - guiding groove; 132 - recessed area; 14 a second cavity; _{1 5} an open slot; - Quantitative container; 21 - rotating handle; 22 - upper rotating shaft; 23 lower rotating shaft; 24 - quantitative chamber; 25 - first countersunk; 3 holder; 31 - outlet slot; 31 1 outlet slot; Lotus-like structure; 321 - annular ring; 33 - lower rotary groove; 34 - pump structure cavity; 341 - piston through hole; 342 - piston groove; 343 a limit device; 35 - annular groove; 4 a pump structure; Piston; 41 1 piston boss; 412 - first wedge protrusion; 413 - piston cavity; 414 a venting through hole; 41 5 - piston card position; 41 6 piston sealing groove; 42 - piston inner sleeve; Second wedge-shaped protrusion; 423 - inner sleeve cavity; 424 - spring pin hole; 425 - tie rod groove; 426 - inner sleeve hole; 43 - tie rod; 431 - spring pin; 432 - tie rod card position; 433 - tie rod pass Hole; 44-reverse stop; 45-piston spring; 46-inner spring; 5--sheath structure; 51-coat cavity; 52-first Jacket through hole; 53 - jacket projection; 54 - spiral groove; 55 - second jacket through hole.

For a better understanding of the present invention, the specific embodiments of the present invention are described in detail below. detailed description

Embodiment 1:

As shown in Figs. 1 to 11, a first embodiment of the metering pump device of the present invention comprises a liquid storage container 1, a quantitative container 2, a holder 3, a pump structure 4, and a jacket structure 5. The liquid storage container 1 is sealingly connected to the top of the quantitative container 2, and the support 3 is sealingly connected to the bottom of the quantitative container 2; the outer casing structure 5 surrounds the quantitative container 2, the support 3.

As shown in Fig. 2, the liquid storage container 1 is a cylindrical container including a first cavity 13, a guide groove 131, a recessed portion 132, a second cavity 14, a vent hole 1, an upper rotary groove 12, and an open groove 15. The top surface and the side surface of the first cavity 13 are sealed, and the bottom surface has an inverted conical recessed area 132. The bottom of the recessed area 132 is provided with a guiding groove 131. The liquid in the first cavity 13 can be guided in the recessed area 132. The slot 131 flows out. The bottom of the liquid storage container 1 is provided with a second cavity 14 having an open bottom surface, and communicates with the first cavity 13 via a guiding groove 131. The guiding groove 131 has a downward extending portion in the second cavity 14. The side of the second cavity 14 is provided with a vent hole 1 1 and an opening groove 15, and an upper rotary groove 12 is provided at the center of the top surface.

As shown in FIG. 3, the quantitative container 2 is a cylinder corresponding to the second cavity 14, the top surface is provided with a first sump 25, and the center is provided with an upper rotating shaft 11 corresponding to the upper rotating groove 12, A metering chamber 24 is provided in the sinking station 25 through the metering container 2. The bottom of the bottom surface of the dosing container 1 is provided with a lower rotating shaft 23 corresponding to the upper rotating shaft 22, and a side below the first sunken table 25 is provided with a rotating handle 21. The dosing container 2 is housed in the second cavity 14, the top surface of which is in close contact with the top surface of the second container 14, and the extension of the guiding groove 131 is in contact with the first sinking table 25. The upper rotary shaft 22 is inserted into the upper rotary groove 12 of the liquid storage container 1, and the rotary handle 21 projects from the open groove 15 of the side wall of the second chamber 14. The vent hole 1 1 is disposed on a side of the second cavity 14 between the top surface of the constant volume container 2 and the first stage 25 .

As shown in Figures 4 and 4a, the support 3 has a lead-out slot 31, a pump structure chamber 34 and a lotus-like structure 32. The lead-out groove 31 penetrates the top surface and the bottom surface of the holder 3, and a lead groove notch 31 1 is formed on the top surface of the holder 3. The pump structure chamber 34 is a rotary body cavity with an open bottom surface. The top surface communicates with the outside through the piston through hole 341. The side surface has a piston groove 342, and the bottom portion of the side surface is provided with an inwardly protruding limiting device 343. The center of the top surface of the holder 3 is provided with a lower rotation groove 33 corresponding to the lower rotation shaft 23. As shown in FIG. 1 to FIG. 2, the lower portion of the lead-out groove 31 is provided with an annular groove 35, and an annular ring 321 is fixed in the annular groove 35. The upper portion of the lotus-like structure 32 is provided with a groove corresponding to the annular ring 321 to form a rotating pair and a ring. The ring 321 is connected and the lotus-like structure 32 is rotatable about the annular ring 321 at an angle. A spring is disposed between the lotus-like structure 32 and the annular ring 321 . Due to the elastic deformation of the spring, a plurality of lotus-like structures 32 are spaced around the annular ring 321, to isolate the notch of the lower end of the lead-out groove 31 from the outside. The lotus-like structure 32 is exposed to the annular ring 321 by an external force, and then the lower port of the lead-out groove 31 is exposed to facilitate the liquid discharge.

The bottom surface of the dosing container 2 is flat and is sealingly connected to the top surface of the support 3. The lower rotating shaft 23 of the dosing container 1 is coupled with the lower rotating groove 33 at the center of the holder 3, and the quantitative container 2 is rotated by the rotating handle 21, and the above rotating shaft 22 and the lower rotating shaft The shaft 23 is relatively rotated relative to the reservoir 1 and the holder 3, wherein the reservoir 1 and the holder 3 are not rotated relative to each other. Since the guiding groove 131 has an extending portion that interferes with the first sinking table 25, and the opening groove 15 from which the rotating handle 21 protrudes is also limited, the quantitative container 2 can only be in a certain angular range with respect to the liquid storage container 1 and The support 3 rotates.

As shown in Fig. 5, the pump structure 4 includes a piston 41, a piston inner sleeve 42, a pull rod 43, a check piece 44, a piston spring 45, and an inner sleeve spring 46. The pull rod 43 is disposed in the inner sleeve chamber 423 of the piston inner sleeve 42 and the piston inner sleeve 42 is in the piston chamber 413 of the piston 41. The piston spring 45 surrounds the piston inner sleeve 42 and the tie rod 43, the upper end is in contact with the bottom surface of the piston 41, and the lower end is in contact with the stopper 343. The inner sleeve spring 46 is located in the inner sleeve cavity 413, the upper end is in contact with the top surface of the inner sleeve cavity 413, and the lower end is in contact with the top surface of the tie rod 43.

As shown in Fig. 6, the piston 41 slides in the pump structure chamber 34, and the outer side of the upper end is provided with a piston seal groove 416, wherein the seal ring is mounted to realize the top surface of the piston 41 and the top surface and the side surface of the pump structure chamber 34. Form a sealed space. The piston 41 is provided with a piston latching position 415 on the side thereof, and the piston recess 342 corresponding to the piston latching position 415 is matched with the piston latching position 415 to prevent relative rotation of the piston 41 in the pump structure chamber 34. The top surface of the piston 41 is further provided with a gas permeable through hole 414 and a piston boss 41 1 corresponding to the piston through hole 341, and a piston cavity 413 having a bottom surface open therein. A first wedge-shaped projection 412 is disposed at the bottom of the sidewall of the piston cavity 413.

As shown in FIG. 7, the piston inner sleeve 42 has a bottom open inner sleeve chamber 423 having a bottom sleeve hole 426 on its top surface, and the inner sleeve chamber 423 communicates with the piston chamber 413 through the inner sleeve hole 426. The inner side of the piston inner sleeve 42 has a pull rod groove 425, and the upper portion of the inner sleeve chamber 423 is provided with a through side spring pin hole 424. A second wedge-shaped protrusion 421 corresponding to the first wedge-shaped protrusion 412 is disposed on a side of the side of the piston inner sleeve 42. The first wedge-shaped protrusion 41 and the second wedge-shaped protrusion 42 have a certain distance between the first wedge-shaped protrusion 41 and the second wedge-shaped protrusion 42. It is possible to move relative to the piston 41 between this distance and not to fall off due to the snap between the wedge projections. Due to the action of the piston spring 45, the piston and the inner sleeve of the piston are in a relative position fixed unless an external force acts.

The pull rod 43 is provided with a lateral spring pin 431, and the spring pin 431 is inserted into the spring pin hole 424 to be coupled to the piston inner sleeve 42. When the pull rod 43 and the piston inner sleeve 42 are fixed by the embedded spring pin hole 424, move together to the limiting device 343 at the bottom of the side of the piston cavity 41 3 , the spring pin 431 is pressed into the pull rod 43 to make the pull rod 43 and the piston Relative movement occurs between the inner sleeves 42. The side of the pull rod 43 has an outwardly projecting lever latching portion 432 having a pull rod through hole 433 extending through the top surface and the bottom surface. The pull rod 43 is engaged with the pull rod groove 425 by the lever latching position 432 to prevent relative rotation of the pull rod 43 and the piston inner sleeve 42. The backstop 44 is located between the top surface of the piston cavity 413 and the top surface of the piston inner sleeve 42. When the pull rod 43 drives the inner sleeve 42 to move in the piston cavity 413 toward the top surface of the piston cavity 413, the backstop 44 is sealed. With the venting through hole 414, the air flow can only flow out of the piston inner sleeve 42 through the rod through hole 433.

As shown in FIG. 8, the outer casing structure 5 includes a top open outer casing cavity 51. The outer side of the outer casing cavity 51 has a symmetrical outer casing protrusion 53. The bottom surface has a first outer casing through hole 52 which cooperates with the lead-out groove 31. The lead-out groove 31 projects from the first outer cover through hole 52. The side of the casing cavity 51 further has a spiral groove 54 into which the rotating handle 21 of the dosing container 2 is embedded. Among the spiral grooves 54, the rod 43 of the pump structure 4 is moved by the rotation of the dosing container 2. The dosing container 2 and the support 3 are surrounded by the outer casing structure 5. The outer casing cavity 51 is further provided with a casing spring surrounding the support 3, the upper end of which is in contact with the support 3 and the lower end is in contact with the bottom surface of the outer casing cavity 51. The outer casing projection 53 on the side wall of the outer casing 51 holds the support 3 into a limit position. The lower portion of the tie rod 43 is fixedly coupled to the bottom surface of the outer casing cavity 51. Where the bottom surface of the outer casing cavity 51 is fixed to the pull rod 43, a second outer cover through hole 55 is provided, and the pull rod through hole 433 of the pull rod 43 communicates with the outside through the second outer cover through hole 55. The outer casing structure 5 needs to be installed from the bottom to the top during assembly.

Since the rotary handle 21 can only rotate within a certain range, and the rotary handle 21 drives the quantitative container 2 to ascend or descend with the sliding of the spiral groove 54. As shown in FIG. 9, the starting point of the rotation of the dosing container 2 is set at an angle at which the lower notch of the guiding groove 131 of the liquid storage container 1 communicates with the quantitative cavity 24 of the dosing container 2, and the first cavity 13 passes through the guiding groove 131 and is quantified. The cavity 24 is connected and is defined as an A state. As shown in Fig. 10, the end point of the rotation of the dosing container 2 is set in the outlet groove 31 of the flow guiding container 3 to communicate with the quantitative volume 24, which is defined as the B state. As shown in FIG. 11, in a certain area between the A state and the B state, the quantitative cavity 24 is not in communication with the first cavity 13 and the lead-out groove 24, and only communicates with the pump structure cavity 34 through the piston through hole 341. Defined as C state.

During use, the manual or automatic device applies a certain downward pressure on the top of the liquid storage container 1 and supports it at the bottom of the outer casing structure 5 while placing the lower outer portion of the lotus petal structure 32 in a suitable hole. The outer casing structure 5 is moved relative to the dosing container 2 and the support 3 and compresses the outer casing spring. The pull rod 43 follows the outer casing structure 5 to move downward, and the piston inner sleeve 42 starts to move downward. Since the piston inner sleeve 42 is away from the piston 41. When the inner sleeve 42 and the piston 41 are caught by the first wedge-shaped projection 412 and the second wedge-shaped projection 421, the piston 41 is moved downward to press the piston spring 45. At this time, the air pressure in the pump structure chamber 34 is much lower than the air pressure in the piston chamber 413, and the check piece 44 tightly covers the venting through hole 414, and the airflow cannot enter the pump structure chamber 34, resulting in the pump structure chamber 34. A vacuum appears in the middle. Since the piston 41 moves downward, the piston boss 41 1 is disengaged from the piston through hole 341. As the rotary handle 21 moves in the threaded groove 54, the quantitative container 2 is moved in the direction of the pump structure chamber 34, and when it is rotated to the position where the quantitative chamber 24 communicates with the pump structure chamber 34, it is in the C state, as shown in FIG. As shown in Figure 1, the metering chamber 24 exchanges vacuum with the pump structure chamber 34.

After the vacuum in the quantitative chamber 24 is continued to the A state, the quantitative container 2 and the support 3 continue to move downward, compressing the outer casing spring, and the pull rod 43 drives the inner piston sleeve 42 and the piston 41 to continue downward movement to compress the piston spring. When connecting the lever

When the spring pin 431 of the piston inner sleeve 42 and the retaining device 343 of the lower end of the pump structure chamber 34 are moved, the spring pin 431 is pressed into the pull rod 43, and the spring pin 431 is contracted to generate between the pull rod 43 and the inner piston sleeve 42. Relatively moving, the pull rod 43 loses the limit function of pulling the inner sleeve 42 of the piston due to the retraction of the spring pin 431, so that it is free to slide in the inner portion 42 of the piston and does not generate power in any direction. The inner sleeve 42 of the piston is inside the piston 41. The spring of the sleeve spring 46 moves upwards while the piston

41 also moves upward due to the restoring tension of the piston spring 45.

As shown in FIG. 9, after reaching the starting point of rotation, the quantitative cavity 24 and the first cavity 13 of the liquid storage container 1 pass through the guiding groove 131. Connected, where the metering pump is in the A state. The liquid in the first chamber 13 is drawn into the metering chamber 24 due to the vacuum in the metering chamber 24.

At this time, the external pressure is released. Due to the restoring force of the outer casing spring, the support 3 and the quantitative container 2 move upward relative to the outer casing structure 5, since the rotation of the rotary shank 21 in the threaded groove 54 drives the quantitative container 1 in the opposite direction with respect to The support 3 rotates and starts to move to the end point and to the B state. The piston 41 first approaches the top surface of the pump structure chamber 34 under the action of the restoring force of the piston spring 45. The gas in the pump structure chamber 34 escapes from the venting through hole 414 on the top surface of the piston 41, and the air flow can push the backstop piece 44 into the piston inner sleeve 42 and along the inner sleeve cavity 423 to the rod through hole 433 to the outside. flow. Thereafter, before the spring pin 431 of the pull rod 43 enters the spring pin hole 424, due to the pressing action of the inner sleeve spring 46, the pull rod 43 drives the piston inner sleeve 42 to contact the top surface of the piston chamber 413, and the piston 41 is first moved to the pump structure chamber. 34 top movement. When the quantitative chamber 24 of the metering container 2 has not reached the piston through hole 341, the piston boss 41 1 of the piston 41 has filled the piston through hole 341, and the quantitative chamber 24 is isolated from the pump structure chamber 34, and the liquid therein is not It will flow into the pump structure chamber 34.

As the metering container 1 continues to rotate toward the end point, the pull rod 43 moves into the inner sleeve chamber 423 until the spring pin 431 is inserted into the spring pin hole 424, and the piston inner sleeve 42 moves into the piston chamber 413. When the quantitative chamber 24 is rotated to a position that communicates with the outlet chamber 31 of the holder 3, that is, the B state, as shown in FIG. At this time, the vent hole 1 1 on the side wall of the second chamber 14 of the liquid storage container 1 communicates with the quantitative chamber 24. In the downward movement, since the lotus-like structure 32 is rotated around the annular ring 321 by a certain angle to open the discharge slot of the lead-out slot 31, the air is injected into the vent hole 1 1 to generate air pressure, and the liquid in the volume chamber 24 is passed through the lead-out slot 31. Discharge, the process of guiding the entire trace of liquid in a closed environment.

Embodiment 2:

As shown in Fig. 12, the dosing container 2 is a rectangular columnar structure which is sealingly connected to the liquid storage container 1, the dosing container 2, and the holder 3, respectively. The metering container can be displaced relative to the reservoir container 1 and the holder 3 by translation. When the dosing container 1 is moved to the state in which the dosing chamber 24 is in communication with the pump structure chamber 34, a vacuum is generated in the dosing chamber 24 by the pulling of the piston 41; when the dosing container is translated to the first chamber of the liquid storage container 1 In the state of 13 communication, the quantitative cavity 24 exchanges vacuum with the first cavity 13, and the reagent to be guided is sucked from the first cavity 13; when the quantitative container 2 is translated to the state in which the quantitative container 24 communicates with the lead-out groove 31 Next, the reagent is discharged through the lead-out tank 31 to achieve the introduction of a trace amount of liquid in a closed environment.

Compared with the prior art, the embodiment of the metering pump device of the present invention does not need to be made of a flexible material, and completely guides the required fluid without residual liquid in the container, and is suitable for the introduction of medium and small liquids. . During the entire guiding process, it is always isolated from the outside air, effectively preventing the liquid reagents being guided from being polluted by the outside air.

Claims

Claim

A quantitative pump device, comprising:

a liquid storage container having a first cavity;

Quantitative container, having a certain volume of cavity;

Export slot;

a pump structure comprising a pump structure chamber and a piston, the pump structure chamber containing the piston and sealingly connected with the piston; the quantitative container being sealingly connected to the liquid storage container, the outlet groove and the pump structure, respectively The cavity is selectively connected to the first cavity, the outlet slot and the pump structure;

The utility model further comprises a venting hole, wherein the venting hole communicates with the outer boundary via the vent hole in a state in which the quantitative cavity is in communication with the lead-out groove.

The metering pump device according to claim 1, wherein the outlet groove and the pump structure chamber are disposed on a seat, and the holder is sealingly connected to the bottom surface of the quantitative container; The bottom end has a limiting device that protrudes inward.

3. The metering pump apparatus according to claim 2, wherein the pump structure further comprises:

a piston through hole is disposed on a top surface of the pump structure cavity, and the pump structure cavity communicates with the quantitative cavity through the piston through hole in a state in which the pump structure cavity communicates with the quantitative cavity;

The inner sleeve spring is disposed in the inner sleeve cavity, the upper end is in contact with the top surface of the inner sleeve cavity, and the lower end is in contact with the top surface of the tie rod.

4. The metering pump apparatus according to claim 3, further comprising a plurality of lotus-like structures and an annular ring, wherein the lotus-like structure is connected to the annular ring by a rotating pair, and the annular ring is fixed to the annular groove at the bottom of the outlet groove. Inside.

The dosing pump device according to claim 4, wherein the top surface of the first cavity is sealed with the side surface, the bottom surface has a downward recessed area and a straight downward guiding groove, and the guiding groove One end opening is disposed at a lowest point of the recessed area; the bottom of the liquid storage container has a second open cavity at the bottom, and the top surface of the second cavity communicates with the first cavity through the guiding groove, the side surface The venting hole is provided, and the second cavity contains the quantitative container.

The dosing pump device according to claim 5, wherein the top surface of the dosing container has a first sinking table, and the guiding groove has an extending section facing downward from the top of the second cavity, the extending section And the first sinking table is in contact with; the quantitative cavity is disposed in the first sinking table, and penetrates the top surface and the bottom surface.

The metering pump device according to claim 6, wherein the center of the top surface of the metering container has an upper rotating shaft, and the top surface of the second chamber has an upper rotating groove that cooperates with the upper rotating shaft; The bottom surface of the dosing container has a lower rotation axis coaxial with the upper rotation axis, and the support top surface has a lower rotation groove that cooperates with the lower rotation shaft.

The metering pump apparatus according to claim 6, wherein the metering container is sealingly connected to the holder and the liquid storage container by a moving pair.

The dosing pump device according to claim 7, further comprising an outer casing structure, wherein the outer casing has a top open outer casing cavity, and a convex outer casing is provided on an upper inner side surface thereof; The outer casing surrounds the support and the quantitative container, and the lead-out groove protrudes from the first outer cover through hole of the outer surface of the outer casing; the bottom of the pull rod is fixedly connected with the bottom surface of the outer casing, and the second outer cover through hole is provided at the connection position. The pull rod through hole communicates with the outside through the second outer cover through hole.

10 . The metering pump device according to claim 9 , further comprising a rotating handle, wherein the rotating handle is fixedly connected to the side of the quantitative container under the first sinking table; An opening slot is provided, and the rotating handle protrudes from the opening slot; a side of the casing cavity is provided with a spiral groove corresponding to the rotating handle, and the rotating handle is embedded in the spiral groove.