Liquid preparation pump

Abstract

The utility model provides a dispensing pump, including main part, plunger sleeve, plunger inner rod, ejector block and plunger head, be equipped with the cavity in the main part, the first end of cavity is equipped with the liquid suction and injection channel, the first end of plunger sleeve is inserted into the cavity from the second end of cavity, the plunger head is equipped on the first end of plunger sleeve and with the cavity clearance fit, and the plunger head is equipped with the plunger inner rod. The plunger inner rod is inserted into the second end of the plunger sleeve, and the plunger inner rod can drive the plunger sleeve to move back and forth in the cavity; the ejector block is arranged in the plunger sleeve and is close to the plunger head, and the plunger inner rod can force the ejector block to move into the plunger head, so that the plunger head expands and deforms outwards in the radial direction and is in contact with the inner wall of the cavity; the liquid suction device is small in friction resistance during liquid suction, and liquid can be sucked conveniently, easily and quickly.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a liquid dispensing pump. Background Art

[0002] In high-speed immunoluminescence analyzers, the amount of cleaning fluid consumed increases with the experimental throughput. The cleaning fluid is usually composed of a mixture of water and concentrate in a certain ratio, and is usually mixed and added to the equipment manually, which wastes human resources and is not economically efficient. Currently, a plunger pump with multiple plunger barrels is used. By adjusting the depth of each plunger rod inserted into the corresponding plunger barrel, the volume within each plunger barrel is adjusted to adjust the amount of water or concentrate, thereby achieving the target mixing ratio. However, during the liquid aspiration process of this plunger pump, the plunger head and the inner wall of the plunger barrel are always in contact, resulting in a large frictional resistance between the two. Utility Model Content

[0003] The utility model aims to provide a liquid dispensing pump with small friction resistance when sucking liquid.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a liquid dispensing pump, including a main body, a plunger sleeve, a plunger inner rod, a top block and a plunger head. A cavity is provided in the main body, and a suction and injection channel is provided at the first end of the cavity. The first end of the plunger sleeve is inserted into the cavity from the second end of the cavity. The plunger head is arranged on the first end of the plunger sleeve and cooperates with the cavity gap. The plunger inner rod is inserted into the second end of the plunger sleeve, and the plunger inner rod can drive the plunger sleeve to move back and forth in the cavity; the top block is arranged in the plunger sleeve, and the plunger inner rod can force the top block to move into the plunger head, so that the plunger head expands and deforms radially outward and contacts the inner wall of the cavity.

[0005] It can be seen from the above scheme that through the above arrangement, when aspirating liquid, the clearance between the plunger head and the cavity is matched, which is conducive to avoiding friction resistance between the plunger head and the inner wall of the cavity, and facilitating easy and rapid aspiration of liquid; when injecting liquid, the inner rod of the plunger moves toward the top block, pushing the top block into the plunger head to open the plunger head, so that the plunger head contacts the inner wall of the cavity, ensuring that the liquid medicine in the cavity can be completely discharged, which is conducive to improving the drainage efficiency.

[0006] A further solution is that at least two elastic parts are circumferentially arranged on the first end of the plunger sleeve, the plunger head is made of elastic material, the plunger head is sleeved on the outside of the two elastic parts, and the top block can enter between the two elastic parts to force the elastic parts to swing elastically radially outward, thereby forcing the plunger head to deform.

[0007] It can be seen from the above scheme that through the above arrangement, the elastic part swings elastically radially outward during liquid injection to force the plunger head to expand and deform radially outward. During liquid absorption, the top block separates from the plunger head, the elastic part rebounds, and the plunger head returns to its original shape.

[0008] A further solution is that the plunger inner rod can move axially a preset distance relative to the plunger sleeve.

[0009] It can be seen from the above scheme that through the above arrangement, when injecting liquid, the inner rod of the plunger first pushes the top block into the plunger head to force the plunger head to expand and deform radially outward, thereby facilitating the discharge of the liquid in the cavity; when aspirating liquid, the inner rod of the plunger first drives the top block away from the plunger head, so that the plunger head returns to its original shape, so that the plunger head does not contact the inner wall of the cavity, so as to avoid friction resistance between the two.

[0010] A further solution is that a slide groove is provided on the inner side of the plunger sleeve along its axial direction, and a pin shaft is provided on the plunger inner rod. The end of the pin shaft protrudes from the outer surface of the plunger inner rod and is inserted into the slide groove, and the pin shaft can move back and forth along the extension direction of the slide groove.

[0011] It can be seen from the above scheme that by setting the sliding groove, the inner rod of the plunger can move relative to the plunger sleeve. The extension distance of the sliding groove is the maximum distance of relative movement of the inner rod of the plunger, ensuring that the top block can be driven to move into place.

[0012] A further solution is that a connecting piece is connected between the top block and the inner rod of the plunger, and the connecting piece is an elastic piece or a rod piece.

[0013] As can be seen from the above scheme, when the connecting member is an elastic member, during liquid injection, the elastic member gradually compresses and accumulates energy, and then pushes the top block into the plunger head. During liquid aspiration, the plunger inner rod moves backward, and the elastic member releases its elastic force toward the plunger inner rod. During the movement of the plunger head, the plunger head is subjected to the force of the inner wall of the cavity, and while restoring its original shape, it squeezes and pushes the top block out of the plunger head. When the connecting member is a rod member, during liquid injection, the plunger inner rod directly pushes the top block into the plunger head through the rod member. During liquid aspiration, the plunger inner rod directly pulls the top block out of the plunger head through the rod member.

[0014] A further solution is that the liquid dispensing pump further includes a driving device, which is connected to the inner rod of the plunger to drive the inner rod of the plunger to move back and forth.

[0015] A further solution is that the liquid dispensing pump also includes a detection piece and two in-place detection devices, the two in-place detection devices are respectively arranged at both ends of the movement direction of the inner rod of the plunger, the detection piece moves synchronously with the inner rod of the plunger, and the detection piece can trigger the in-place detection device to send an in-place signal.

[0016] A further solution is that the volume of the cavity is adjustable.

[0017] It can be seen from the above scheme that, through the above settings, the volume of the cavity can be adjusted according to actual needs to achieve quantitative liquid suction and discharge.

[0018] A further solution is that the liquid dispensing pump also includes an adjusting sleeve and a liquid suction piece, the adjusting sleeve is arranged in the first end of the cavity, and the depth of the adjusting sleeve inserted into the cavity is adjustable, the liquid suction piece is arranged on the end of the adjusting sleeve and moves with the adjusting sleeve, the outer periphery of the liquid suction piece is sealed with the cavity, and the liquid suction and injection channel passes through the liquid suction piece axially.

[0019] It can be seen from the above solution that the volume of the cavity can be adjusted by adjusting the depth of the adjusting sleeve inserted into the cavity.

[0020] A further solution is that at least two cavities are provided in the main body, each cavity is correspondingly provided with a plunger head, a plunger sleeve, a plunger inner rod, a top block, an adjustment sleeve and a liquid suction piece, and all the plunger inner rods move synchronously.

[0021] As can be seen from the above solution, by providing at least two cavities, it is convenient to simultaneously realize the suction and injection operations of at least two liquids, and it is convenient to prepare the mixed liquid according to the target mixing ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of an embodiment of the present utility model.

[0023] Figure 2 It is an exploded view of an embodiment of the present utility model.

[0024] Figure 3 It is an overall cross-sectional view of the embodiment of the utility model when absorbing liquid.

[0025] Figure 4 It is a cross-sectional view of the main components of the embodiment of the utility model when absorbing liquid.

[0026] Figure 5 It is an overall cross-sectional view of the embodiment of the utility model during liquid injection.

[0027] Figure 6 It is a cross-sectional view of the main components of the embodiment of the utility model when absorbing liquid.

[0028] Figure 7 It is an exploded view of the plunger sleeve and the plunger head in the embodiment of the present utility model.

[0029] Figure 8 1 is a cross-sectional view of the plunger head before deformation in an embodiment of the present invention.

[0030] Figure 9 1 is a cross-sectional view of a deformed plunger head in an embodiment of the present invention.

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] Description Figure Numbers:

[0033] 1-main body, 11-cavity;

[0034] 2- plunger sleeve, 21- elastic portion, 211- inclined surface, 22- tapered groove, 23- slide groove;

[0035] 3- plunger inner rod, 31- pin shaft;

[0036] 4-top block;

[0037] 5- plunger head;

[0038] 6-Connector;

[0039] 7-sealing structure, 71-sealing sleeve, 72-O-ring, 73-pressure ring;

[0040] 8- support plate;

[0041] 9-driving device, 91-driving seat, 92-ball screw pair;

[0042] 10-test piece;

[0043] 20-In-place detection device;

[0044] 30-Adjustment sleeve;

[0045] 40-liquid suction part, 401-connector, 402-plug, 4021-liquid suction and injection channel, 403-sealing ring. DETAILED DESCRIPTION

[0046] See also Figures 1 to 6 The present embodiment provides a liquid dispensing pump, comprising a main body 1, a plunger sleeve 2, a plunger inner rod 3, a top block 4 and a plunger head 5.

[0047] The main body 1 is provided with a cavity 11. The number of cavities 11 can be one, two, or more. In this embodiment, two cavities 11 are used as an example, and the two cavities 11 are arranged side by side. The first end of each cavity 11 is provided with a liquid suction and injection channel 4021. Each cavity 11 is correspondingly provided with a plunger sleeve 2, a plunger inner rod 3, a top block 4, and a plunger head 5.

[0048] The first end of the plunger sleeve 2 is inserted into the cavity 11 from the second end of the cavity 11, and the plunger sleeve 2 can move back and forth in the cavity 11. The plunger head 5 is arranged on the first end of the plunger sleeve 2 and can move synchronously with the plunger sleeve 2. The plunger inner rod 3 is inserted into the second end of the plunger sleeve 2, and the plunger inner rod 3 can drive the plunger sleeve 2 to move back and forth in the cavity 11. The top block 4 is arranged in the plunger sleeve 2 and is located on the end of the plunger inner rod 3 facing the suction and injection channel 4021. When the plunger inner rod 3 moves toward the first end of the plunger sleeve 2, it can force the top block 4 to move into the plunger head 5, and the top block 4 can drive the plunger head 5 to expand and deform radially outward and contact the inner wall of the cavity 11.

[0049] When aspirating liquid, the plunger head 5 and the cavity 11 are loosely matched. At this time, the plunger sleeve 2 moves in the cavity 11 in the direction away from the liquid aspiration channel 4021. During this period, the plunger head 5 does not contact the inner wall of the cavity 11, which is beneficial to avoid friction resistance between the plunger head 5 and the inner wall of the cavity 11, and facilitates the plunger inner rod 3 to pull the plunger sleeve 2 to move with a smaller driving force.

[0050] During injection, the plunger inner rod 3 forces the top block 4 to enter the interior of the plunger head 5, causing the plunger head 5 to expand and deform radially outward and come into close contact with the inner wall of the cavity 11. The plunger sleeve 2 drives the plunger head 5 to move toward the suction and injection channel 4021, facilitating the complete discharge of the liquid medicine in the cavity 11, avoiding liquid medicine residue, and helping to improve the drainage efficiency.

[0051] To prevent liquid medicine from leaking through the gap between the plunger sleeve 2 and the inner wall of the cavity 11, this embodiment provides a sealing structure 7 between the cavity 11 and the plunger sleeve 2. The sealing structure 7 comprises a sealing sleeve 71, an O-ring 72, a pressure ring 73, and a stepped portion provided on the second end of the cavity 11, the stepped portion being recessed into the inner wall of the cavity 11. The O-ring 72 and the sealing sleeve 71 are both sleeved onto the outside of the plunger sleeve 2 and sealed to the stepped portion. The pressure ring 73 is screwed into the stepped portion to prevent the sealing sleeve 71 and O-ring 72 from detaching. The plunger head 5 and the plunger sleeve 2 can move relative to the O-ring 72 and the sealing sleeve 71.

[0052] See also Figure 7 、 Figure 8 and Figure 9 To achieve radially outward expansion and deformation of the plunger head 5, this embodiment has at least two elastic portions 21 circumferentially disposed on the first end of the plunger sleeve 2. Eight elastic portions 21 are arranged circumferentially around the plunger sleeve 2. A tapered groove 22 is formed between the eight elastic portions 21. Specifically, the inner walls of the elastic portions 21 are provided with inclined surfaces 211, and the outer walls of the elastic portions 21 extend axially along the plunger sleeve 2. A gap is provided between adjacent elastic portions 21. The connecting ends of the elastic portions 21 are fixedly connected to the plunger sleeve 2, while the free ends of the elastic portions 21 are capable of elastically swinging radially around the plunger sleeve 2.

[0053] The plunger head 5 is made of an elastic material, preferably rubber or silicone. The plunger head 5 is sleeved on the outside of the eight elastic parts 21. The top block 4 is arranged in the first end of the plunger sleeve 2 and can move into the conical groove 22 of the plunger head 5. When the top block 4 is located in the first end of the plunger sleeve 2, the eight elastic parts 21 are all in their original state, and the plunger head 5 is in a state before deformation; when the top block 4 enters the conical groove 22, the top block 4 fits with the inclined surface 211 of the elastic part 21 and pushes the elastic part 21 to move radially outward, so as to force the plunger head 5 to expand and deform radially outward. The degree of deformation of the plunger head 5 gradually increases as the depth of the top block 4 entering the conical groove 22 increases.

[0054] Combine Figure 4 and Figure 6 In order to achieve that the plunger head 5 deforms first during injection and the plunger sleeve 2 then moves toward the injection channel 4021, the plunger inner rod 3 of this embodiment can move axially a preset distance relative to the plunger sleeve 2. Specifically:

[0055] The inner side of the plunger sleeve 2 is provided with two chute grooves 23 along its axial direction. These two chute grooves 23 are located on opposite sides of the plunger sleeve 2 and communicate with the interior of the plunger sleeve 2. A pin 31 is provided at one end of the plunger inner rod 3. The end of the pin 31 protrudes from the outer surface of the plunger inner rod 3 and is inserted into the corresponding chute groove 23. The pin 31 can move back and forth along the extension direction of the chute groove 23. The extension length of the chute groove 23 is the maximum distance the plunger inner rod 3 can move relative to the plunger sleeve 2.

[0056] When the plunger inner rod 3 moves toward the suction and injection channel 4021, the plunger inner rod 3 first moves a preset distance relative to the plunger sleeve 2, so that the top block 4 enters between the eight elastic parts 21, causing the free ends of the eight elastic parts 21 to expand radially, further stretching the plunger head 5, and then the plunger inner rod 3 and the plunger sleeve 2 move synchronously to discharge the liquid medicine in the cavity 11.

[0057] In order to realize the movement of the top block 4 , a connecting member 6 is connected between the top block 4 and the plunger inner rod 3 . The connecting member 6 is an elastic member that elastically abuts between the top block 4 and the plunger inner rod 3 .

[0058] When injecting liquid, the plunger inner rod 3 moves toward the top block 4, and the elastic member compresses and stores energy. When the elastic member stores energy to a certain extent, it can push the top block 4 into between the eight elastic parts 21, causing the free ends of the eight elastic parts 21 to expand radially, further deforming the plunger head 5. When aspirating liquid, the plunger inner rod 3 moves away from the top block 4. At this time, the elastic member releases potential energy toward the plunger inner rod 3, that is, the force pushing the top block 4 toward the plunger head 5 disappears. At this time, the plunger sleeve 2 drives the plunger head 5 to move away from the liquid aspiration and injection channel 4021. Since the inner wall of the cavity 11 exerts an extrusion force on the plunger head 5, and the plunger head 5 exerts a force on the top block 4 to move toward the inner rod 3 under the action of its own rebound force, the top block 4 moves out of the plunger head 5, and the plunger head 5 and the elastic part 21 return to the state before deformation, that is, the plunger head 5 does not contact the inner wall of the cavity 11 to avoid friction resistance between the two.

[0059] In other embodiments, the connecting member 6 may also be a rod, with both ends of the rod respectively abutting against the ejector block 4 and the plunger inner rod 3, and the plunger inner rod 3 drives the ejector block 4 in and out of the plunger head 5 through the rod. The rod may be provided separately from the plunger inner rod 3, or the rod may be integrally formed with the plunger inner rod 3.

[0060] Combine Figure 3 、 Figure 5 , and combined with Figure 1 and Figure 2 In order to achieve the back-and-forth movement of the plunger inner rod 3, the liquid dispensing pump of this embodiment further includes a support plate 8, a drive device 9, and a drive seat 91. The drive device 9 and the main body 1 are respectively arranged at both ends of the support plate 8. The drive device 9 can be a motor, a cylinder, or a hydraulic cylinder. In this embodiment, it is effectively a motor. The drive shaft of the motor is connected to the drive seat 91 via a ball screw pair 92. One end of each of the two plunger inner rods 3 is connected to the drive seat 91, so that the drive device 9 can simultaneously drive the two plunger inner rods 3 to move back and forth through the drive seat 91, thereby achieving simultaneous liquid aspiration and injection of the two cavities 11.

[0061] The liquid dispensing pump also includes a detection piece 10 and two in-position detection devices 20. Both in-position detection devices 20 are disposed on the support plate 8 and are respectively disposed at both ends of the movement direction of the plunger inner rod 3. The detection piece 10 is disposed on the drive seat 91 and can move synchronously with the plunger inner rod 3. The detection piece 10 can trigger the in-position detection device 20 to emit an in-position signal. The in-position detection device 20 can be a photoelectric in-position sensor, an electromagnetic in-position sensor, a capacitive in-position sensor, or a mechanical in-position sensor. In this embodiment, a photoelectric switch is preferably used.

[0062] Combine Figure 4 and Figure 6 In order to accurately and quantitatively absorb different liquids according to the target mixing ratio, the volume of each cavity 11 of this embodiment is adjustable. Specifically:

[0063] The liquid dispensing pump also includes an adjusting sleeve 30 and a liquid suction piece 40. The adjusting sleeve 30 is threadedly connected to the first end of the cavity 11, and the depth of the adjusting sleeve 30 inserted into the cavity 11 is adjustable. The adjusting sleeve 30 can be twisted forward and backward to adjust the depth of the adjusting sleeve 30 extending into the interior of the main body 1, thereby adjusting the volume of the cavity 11. The liquid suction piece 40 is arranged on the end of the adjusting sleeve 30 extending into the cavity 11, and the liquid suction piece 40 can move with the adjusting sleeve 30. The outer periphery of the liquid suction piece 40 is sealed with the cavity 11 by a sealing ring 403 to prevent leakage of the liquid medicine; the liquid suction and injection channel 4021 axially penetrates the middle part of the liquid suction piece 40, and the liquid medicine enters and exits the cavity 11 through the liquid suction and injection channel 4021.

[0064] The liquid-absorbing component 40 includes a connector 401, a plug 402, and a sealing ring 403. The first end of the connector 401 is connected to the adjustment sleeve 30, and the second end of the connector 401 protrudes outside the adjustment sleeve 30. An annular groove is provided on the second end of the connector 401, and the sealing ring 403 is disposed within the annular groove and is sealed to the cavity 11. The plug 402 is connected to the middle of the connector 401, and a liquid-absorbing and injection channel 4021 axially extends through the middle of the plug 402, connecting the inside and outside of the cavity 11.

[0065] In summary, it can be seen that, through the above arrangement, the present invention has a clearance fit between the plunger head 5 and the cavity 11 when aspirating liquid, which is beneficial to avoid friction resistance between the plunger head 5 and the inner wall of the cavity 11, and facilitates easy and rapid aspiration of liquid; when injecting liquid, the plunger inner rod 3 moves toward the top block 4, pushing the top block 4 into the plunger head 5 to open the plunger head 5, so that the plunger head 5 contacts the inner wall of the cavity 11, ensuring that the liquid in the cavity 11 can be completely discharged, which is beneficial to improving the drainage efficiency.

[0066] Finally, it should be emphasized that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A liquid dispensing pump, comprising a main body, a cavity provided in the main body, a liquid suction and injection channel provided at a first end of the cavity, characterized in that: The plunger sleeve further comprises a plunger sleeve, a plunger inner rod, a top block and a plunger head, wherein the first end of the plunger sleeve is inserted into the cavity from the second end of the cavity, the plunger head is arranged on the first end of the plunger sleeve and is loosely fitted with the cavity, the plunger inner rod is inserted into the second end of the plunger sleeve, and the plunger inner rod can drive the plunger sleeve to move back and forth in the cavity; The ejector block is disposed in the plunger sleeve, and the plunger inner rod can force the ejector block to move into the plunger head, so that the plunger head expands and deforms radially outward and contacts the inner wall of the cavity.

2. The liquid dispensing pump according to claim 1, characterized in that: At least two elastic parts are circumferentially arranged on the first end of the plunger sleeve. The plunger head is made of elastic material and is sleeved on the outside of the two elastic parts. The top block can enter between the two elastic parts to force the elastic parts to swing elastically radially outward, thereby forcing the plunger head to deform.

3. The liquid dispensing pump according to claim 1, characterized in that: The plunger inner rod can move axially relative to the plunger sleeve by a preset distance.

4. The liquid dispensing pump according to claim 3, characterized in that: A sliding groove is provided on the inner side of the plunger sleeve along its axial direction, and a pin is provided on the plunger inner rod. The end of the pin protrudes from the outer surface of the plunger inner rod and is inserted into the sliding groove. The pin can move back and forth along the extension direction of the sliding groove.

5. The liquid dispensing pump according to claim 1, characterized in that: A connecting piece is connected between the top block and the inner rod of the plunger, and the connecting piece is an elastic piece or a rod piece.

6. The liquid dispensing pump according to claim 1, characterized in that: The liquid dispensing pump further comprises a driving device, which is connected to the plunger inner rod to drive the plunger inner rod to move back and forth.

7. The liquid dispensing pump according to claim 1, characterized in that: The liquid dispensing pump also includes a detection piece and two in-place detection devices, the two in-place detection devices are respectively arranged at both ends of the moving direction of the plunger inner rod, the detection piece moves synchronously with the plunger inner rod, and the detection piece can trigger the in-place detection device to send an in-place signal.

8. The liquid dispensing pump according to claim 1, characterized in that: The volume of the cavity is adjustable.

9. The liquid dispensing pump according to claim 8, characterized in that: The liquid dispensing pump also includes an adjusting sleeve and a liquid suction piece. The adjusting sleeve is arranged in the first end of the cavity, and the depth of the adjusting sleeve inserted into the cavity is adjustable. The liquid suction piece is arranged on the end of the adjusting sleeve and moves with the adjusting sleeve. The outer periphery of the liquid suction piece is sealed with the cavity, and the liquid suction and injection channel axially penetrates the liquid suction piece.

10. The liquid dispensing pump according to claim 9, characterized in that: At least two cavities are provided in the main body, and each cavity is correspondingly provided with the plunger head, the plunger sleeve, the plunger inner rod, the top block, the adjustment sleeve and the liquid absorbing component, and all the plunger inner rods move synchronously.

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