A micro-liquid supply device

Abstract

This utility model relates to a micro-volume liquid supply device, belonging to the field of micro-volume liquid supply technology. It includes a pump sleeve body and a pump rod body. A pump rod hole is formed within the pump sleeve body. One end of the pump rod body is inserted into the pump rod hole, and a handle is fixedly mounted on the other end of the pump rod body. A drive gear is sleeved on the handle, and the drive gear is slidably connected to the handle and rotatably connected to the pump sleeve body. A drive seat is fixedly mounted on the pump sleeve body, and a drive groove is formed on the drive seat. A drive block is slidably mounted within the drive groove, and a drive rack is fixedly mounted on the drive block. The drive rack meshes with the drive gear. A left limiting block and a right limiting block are provided within the drive groove, and the drive block is located between the left and right limiting blocks. The opposing surfaces of the left and right limiting blocks are both used to abut against the drive block. This application has the effect of reducing inaccuracies in fluid metering.

Description

Technical Field

[0001] This utility model relates to the field of micro-liquid supply technology, and in particular to a micro-liquid supply device. Background Technology

[0002] Micro-volume fluid supply equipment is mainly suitable for high-precision supply scenarios of fluids such as electrolytes, acids, alkalis, adhesives, reagents, and pharmaceuticals.

[0003] Among the related technologies, Chinese patent with authorization announcement number CN211525021U provides a micro-plunger pump, in which the pump rod is slidably fitted in the pump rod hole of the pump sleeve. The pump rod hole of the pump sleeve has at least a first hole with a larger diameter and a second hole with a smaller diameter. The upper and lower parts of the pump rod are a thick rod part and a thin rod part, which form a slidable liquid-tight fit with the first hole and the second hole of the pump sleeve, respectively. When the pump rod reciprocates, the gap between the thinner part of the pump rod and the first hole forms a liquid storage cavity. A liquid passage groove is opened on the outer circumference of the pump rod. The liquid passage groove is connected to the liquid storage cavity but does not extend to the end face of the pump rod. The liquid passage groove is mainly set on the thicker part of the pump rod. The lower end of the liquid passage groove ends at the junction of the thicker and thinner parts. The pump sleeve is provided with inlet and outlet holes. The upper end of the liquid passage groove is ensured to still be connected to the inlet and outlet holes when it is at the extreme position of downward movement. A lower cover is also provided at the bottom of the pump sleeve. The inner cavity of the lower cover is connected to the outside. When the pump rod moves downward inward, air is discharged. When the pump rod moves outward, outside air enters the pump rod hole at the bottom of the pump rod and the circular countersunk hole of the lower cover to achieve air pressure balance inside and outside the plunger pump. During liquid metering or filling, firstly, the liquid passage of the pump rod is rotated to align with the inlet nozzle. At this time, the storage chamber is connected to the liquid passage, inlet and outlet holes, and inlet nozzle. The outlet nozzle is sealed by the outer circumferential surface of the thicker part of the pump rod. Then, the pump rod is pulled outward, and the liquid enters the storage chamber from the inlet nozzle and liquid passage, completing the liquid inlet. Afterward, the pump rod is driven to rotate so that the liquid passage is aligned with the outlet nozzle. At this time, the storage chamber is connected to the liquid passage, inlet and outlet holes, and outlet nozzle. The inlet nozzle is sealed by the outer circumferential surface of the thicker part of the pump rod. Finally, the pump rod is pushed inward, forcing the liquid in the storage chamber out through the path of the liquid passage and outlet nozzle, completing the liquid outlet.

[0004] In the process of developing this application, the inventors discovered that the technology has at least the following problems: Since the liquid transfer tank is located inside the pump sleeve, it is not convenient to directly observe whether the liquid transfer tank is aligned with the inlet or outlet when using a plunger pump. When the liquid transfer tank is not accurately aligned with the inlet, the liquid cannot smoothly enter the storage chamber, resulting in insufficient liquid intake. When the liquid transfer tank is not aligned with the outlet, the liquid in the storage chamber cannot be discharged normally, which easily leads to liquid interruption. Both of these will affect the accuracy of fluid metering. Utility Model Content

[0005] To reduce the inaccuracy of fluid metering, this application provides a micro-liquid supply device.

[0006] The micro-liquid supply device provided in this application adopts the following technical solution: A micro-liquid supply device includes a pump sleeve body and a pump rod body. A pump rod hole is formed within the pump sleeve body. One end of the pump rod body is inserted into the pump rod hole, and a handle is fixedly mounted on the other end of the pump rod body. A drive gear is sleeved on the handle and slidably connected to the handle. The drive gear is rotatably connected to the pump sleeve body. A drive seat is fixedly mounted on the pump sleeve body, and a drive groove is formed on the drive seat. A drive block is slidably mounted within the drive groove, and a drive rack is fixedly mounted on the drive block. The drive rack meshes with the drive gear. A left limiting block and a right limiting block are provided within the drive groove, and the drive block is located between the left and right limiting blocks. The opposing surfaces of the left and right limiting blocks are both used to abut against the drive block.

[0007] By adopting the above technical solution, during the liquid metering or filling process, the drive block is first slid to abut against the left limit block. During the sliding process, the drive block drives the drive rack to move, the drive rack drives the drive gear to rotate, and the drive gear drives the handle and pump rod body to rotate synchronously. When the drive block abuts against the left limit block, it pulls the pump rod body outward, and the liquid enters between the pump rod body and the pump sleeve body to complete the liquid inlet. Then, the drive block is slid to abut against the right limit block. During the sliding process, the drive block drives the drive rack to move, the drive rack drives the drive gear to rotate, and the drive gear drives the handle and pump rod body to rotate synchronously. When the drive block abuts against the right limit block, it pushes the pump rod body inward, and the liquid between the pump rod body and the pump sleeve body is expelled to complete the liquid outlet. Since the drive block, left limit block, and right limit block are all located outside the pump sleeve, the positional relationship between the drive block, left limit block, and right limit block makes it easy to observe whether the pump rod body has rotated to the correct position, reducing the possibility of inaccurate fluid metering.

[0008] Preferably, a connecting sleeve is fitted onto the handle, the connecting sleeve is rotatably connected to the pump sleeve body, the connecting sleeve is for the pump rod body to be inserted, the drive gear is fitted onto the connecting sleeve, the drive gear is fixedly connected to the connecting sleeve, a plurality of snap-fit ​​grooves are formed through the inner wall of the connecting sleeve, the snap-fit ​​grooves penetrate the end wall of the connecting sleeve, and snap-fit ​​blocks are slidably arranged in the snap-fit ​​grooves, the snap-fit ​​blocks are fixedly connected to the handle.

[0009] By adopting the above technical solution, when the drive gear rotates, the drive gear drives the connecting sleeve to rotate. The connecting sleeve drives the handle to rotate using the snap-fit ​​block. The handle drives the pump rod body to rotate synchronously. When the pump rod body moves, the pump rod body drives the handle to move. The handle drives the snap-fit ​​block to slide along the snap-fit ​​groove, so that the handle and the connecting sleeve slide relative to each other.

[0010] Preferably, a drive screw is rotatably provided between the left limiting block and the right limiting block, and the drive block is threadedly connected to the drive screw.

[0011] By adopting the above technical solution, the drive screw rotates, causing the drive block to slide along the drive groove.

[0012] Preferably, flexible pads are fixedly provided on the opposite surfaces of the left and right limiting blocks, and the flexible pads are used to abut against the driving block.

[0013] By adopting the above technical solution, the flexible pad replaces the left and right limit blocks in contact with the drive block, reducing the mutual wear between the left and right limit blocks and the drive block.

[0014] Preferably, the pump sleeve body has an inlet hole and an outlet hole on its side wall, both of which are connected to the pump rod hole, and the pump rod body has a liquid passage groove on its side wall.

[0015] By adopting the above technical solution, when the drive block abuts against the left limit block, the liquid passage is aligned with the liquid inlet, and the liquid outlet is closed by the outer peripheral surface of the pump rod body. Then, the pump rod body is pulled outward, and the liquid enters between the pump rod body and the pump sleeve body along the liquid inlet and the liquid passage to complete the liquid inlet. When the drive block abuts against the right limit block, the liquid passage is aligned with the liquid outlet, and the liquid inlet is closed by the outer peripheral surface of the pump rod body. Then, the pump rod body is pushed inward, and the liquid between the pump rod body and the pump sleeve body is forced out along the path of the liquid passage and the liquid outlet to complete the liquid outlet.

[0016] Preferably, the pump rod hole includes an upper hole and a lower hole, the bottom end of the upper hole and the top end of the lower hole are interconnected, the diameter of the upper hole is larger than the diameter of the lower hole, the inlet hole and the outlet hole are both connected to the upper hole, the lower hole is located below the inlet hole and the outlet hole, the pump rod body includes a thick rod and a thin rod, the bottom end of the thick rod and the top end of the thin rod are fixedly connected, the thick rod and the upper hole form a slidable liquid-tight fit, the thin rod and the lower hole form a slidable liquid-tight fit, the liquid passage groove is formed on the side wall of the thick rod, and the bottom end of the liquid passage groove is located at the connection between the thick rod and the thin rod.

[0017] By adopting the above technical solution, when the drive block abuts against the left limit block, the liquid channel is aligned with the liquid inlet, and the liquid outlet is closed by the outer circumferential surface of the thick rod. Then, the rod handle is pulled outward, and the liquid enters the gap between the thin rod and the upper hole along the liquid inlet and the liquid channel to complete the liquid inlet. When the drive block abuts against the right limit block, the liquid channel is aligned with the liquid outlet, and the liquid inlet is closed by the outer circumferential surface of the thick rod. Then, the rod handle is pushed inward to push the liquid between the thin rod and the upper hole out along the path of the liquid channel and the liquid outlet to complete the liquid outlet.

[0018] Preferably, a housing is fitted onto the pump sleeve body, the housing is fixedly connected to the pump sleeve body, the housing is provided with an inlet nozzle and an outlet nozzle, the inlet nozzle communicates with an inlet hole, the outlet nozzle communicates with an outlet hole, the bottom of the housing is flush with the bottom of the pump sleeve body, an end cap is fixedly provided at the bottom of the housing, the end cap has a countersunk hole on the side facing the pump sleeve body, and a through hole on the side of the end cap away from the pump sleeve body, the through hole communicates with the countersunk hole.

[0019] By adopting the above technical solution, the pump rod and the countersunk hole 15 are connected to the outside through the through hole. When the pump rod body moves downward and inward, air is discharged. When the pump rod body moves outward, outside air enters the pump rod hole.

[0020] Preferably, a rubber pad is fixedly installed inside the countersunk hole.

[0021] By adopting the above technical solution, the rubber pad plays a buffering role when the pump rod body falls accidentally.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting up a pump sleeve body, pump rod body, pump rod hole, rod handle, drive gear, drive seat, drive groove, drive block, drive rack, left limit block and right limit block, since the drive block, left limit block and right limit block are all located outside the pump sleeve body, the positional relationship between the drive block, left limit block and right limit block can be used to make it easy to observe whether the pump rod body has rotated into place, and reduce the situation of inaccurate fluid metering. 2. By setting a connecting sleeve, a snap-fit ​​groove, and a snap-fit ​​block, the drive gear is slidably connected to the rod handle, and the drive gear is rotatably connected to the pump sleeve body; 3. By setting a drive screw, the drive block slides along the drive groove. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of a micro-liquid supply device according to an embodiment of this application.

[0024] Figure 2 yes Figure 1 Enlarged view of section A.

[0025] Figure 3 yes Figure 1 Enlarged view of section B.

[0026] Figure 4 This is a cross-sectional view showing the connection relationship between the pump sleeve body and the pump rod body in an embodiment of this application.

[0027] Figure 5 yes Figure 4 Enlarged view of section C.

[0028] Figure 6This is a cross-sectional view showing the connection relationship between the drive seat and the drive block in an embodiment of this application.

[0029] Explanation of reference numerals in the attached drawings: 1. Pump sleeve body; 11. Inlet hole; 12. Outlet hole; 2. Pump rod hole; 21. Upper hole; 22. Lower hole; 3. Pump rod body; 31. Thick rod; 32. Thin rod; 4. Rod handle; 41. Snap-fit ​​block; 5. Drive gear; 51. Drive seat; 52. Drive groove; 53. Drive block; 54. Drive rack; 55. Flexible pad; 551. Left limit block; 552. Right limit block; 56. Drive screw; 6. Connecting sleeve; 61. Snap-fit ​​groove; 7. Liquid passage groove; 8. Housing; 81. Inlet nozzle; 82. Outlet nozzle; 9. End cap; 91. Countersunk hole; 911. Rubber pad; 92. Through hole. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0031] This application discloses a micro-liquid supply device. (Refer to...) Figures 1 to 5The system includes a pump sleeve body 1 and a pump rod body 3. A pump rod hole 2 is formed inside the pump sleeve body 1. One end of the pump rod body 3 is inserted into the pump rod hole 2, and the other end of the pump rod body 3 is integrally formed with a handle 4. The pump rod hole 2 includes an upper hole 21 and a lower hole 22. The bottom end of the upper hole 21 and the top end of the lower hole 22 are interconnected, and the diameter of the upper hole 21 is larger than the diameter of the lower hole 22. An inlet hole 11 and an outlet hole 12 are formed on the side wall of the pump sleeve body 1. Both the inlet hole 11 and the outlet hole 12 are connected to the upper hole 21, and the lower hole 22 is located below the inlet hole 11 and the outlet hole 12. The pump rod body 3 includes a thick rod 31 and a thin rod 32. The bottom end of the thick rod 31 and the top end of the thin rod 32 are integrally formed. The thick rod 31 forms a slidable liquid-tight fit with the upper hole 21, and the thin rod 32 forms a slidable liquid-tight fit with the lower hole 22. A liquid-passing groove 7 is formed on the side wall of the thick rod 31, with the bottom end of the groove 7 located at the connection between the thick rod 31 and the thin rod 32. A housing 8 is fitted onto the pump sleeve body 1 and welded to it. An inlet nozzle 81 and an outlet nozzle 82 are installed on the housing 8. The inlet nozzle 81 communicates with the inlet hole 11, and the outlet nozzle 82 communicates with the outlet hole 12. The bottom of the housing 8 is flush with the bottom of the pump sleeve body 1, and an end cap 9 is installed on the bottom of the housing 8. A countersunk hole 91 is formed on the side of the end cap 9 facing the pump sleeve body 1, and a rubber pad 911 is installed inside the countersunk hole 91. The rubber pad 911 acts as a buffer in case the pump rod body 3 is accidentally dropped. A through hole 92 is formed on the side of the end cap 9 away from the pump sleeve body 1, and the through hole 92 communicates with the countersunk hole 91. During liquid metering or filling, the handle 4 is first rotated to align the liquid-passing groove 7 with the inlet hole 11. At this time, the outlet hole 12 is closed by the outer circumferential surface of the thick rod 31. Then, pull the handle 4 outwards, allowing outside air to enter the pump rod hole 2 through the through hole 92. At this time, liquid enters the gap between the thin rod 32 and the upper hole 21 along the inlet hole 11 and the liquid passage 7, completing the liquid inlet. Then, rotate the handle 4 again to align the liquid passage 7 with the outlet hole 12, at which point the inlet hole 11 is sealed by the outer circumference of the thick rod 31. Then, push the handle 4 inwards, expelling the gas through hole 92 in the pump rod hole 2. At this time, the liquid between the thin rod 32 and the upper hole 21 is forced out along the path of the liquid passage 7 and the outlet hole 12, completing the liquid outlet.

[0032] Reference Figures 1 to 6A connecting sleeve 6 is fitted onto the handle 4, and the connecting sleeve 6 is rotatably connected to the pump sleeve body 1. The connecting sleeve 6 allows the pump rod body 3 to be inserted. Several snap-fit ​​grooves 61 are formed through the inner wall of the connecting sleeve 6, and the snap-fit ​​grooves 61 penetrate the end wall of the connecting sleeve 6. A snap-fit ​​block 41 is slidably set in the snap-fit ​​groove 61, and the snap-fit ​​block 41 is welded to the handle 4. A drive gear 5 is fitted onto the connecting sleeve 6, and the drive gear 5 is welded to the connecting sleeve 6. A drive seat 51 is installed on the pump sleeve body 1, and a drive groove 52 is formed on the drive seat 51. A drive block 53 is slidably set in the drive groove 52. A drive rack 54 is installed on the drive block 53, and the drive rack 54 meshes with the drive gear 5. A left limit block 551 and a right limit block 552 are installed in the drive groove 52. A drive screw 56 is rotatably set between the left limit block 551 and the right limit block 552, and the drive block 53 is threadedly connected to the drive screw 56. The drive block 53 is located between the left limit block 551 and the right limit block 552. The opposite surfaces of the left limit block 551 and the right limit block 552 are equipped with flexible rubber pads 55. The flexible pads 55 are used to abut against the drive block 53 to reduce the mutual wear between the left limit block 551, the right limit block 552 and the drive block 53.

[0033] The implementation principle of a micro-volume liquid supply device according to an embodiment of this application is as follows: When liquid is introduced, the drive screw 56 is rotated to make the drive block 53 slide along the drive groove 52. The movement of the drive block 53 drives the drive rack 54 to move, and the drive rack 54 drives the drive gear 5 to rotate. The drive gear 5 drives the connecting sleeve 6 to rotate, and the connecting sleeve 6 drives the handle 4 to rotate using the snap-fit ​​block 41. The handle 4 drives the pump rod body 3 to rotate synchronously. When the drive block 53 abuts against the left limit block 551, the liquid passage groove 7 is aligned with the liquid inlet hole 11. Then, the handle 4 is pulled outward, and the handle 4 drives the snap-fit ​​block 41 to slide along the snap-fit ​​groove 61, so that the handle 4 and the connecting sleeve 6 slide relative to each other. At the same time, the handle 4 drives the pump rod body 3 to move synchronously, so that the liquid enters the gap between the thin rod 32 and the upper hole 21 through the liquid inlet hole 11 and the liquid passage groove 7 to complete the liquid introduction.

[0034] When liquid is discharged, rotating the drive screw 56 causes the drive block 53 to slide along the drive groove 52. The movement of the drive block 53 drives the drive rack 54 to move, and the drive rack 54 drives the drive gear 5 to rotate. The drive gear 5 drives the connecting sleeve 6 to rotate, and the connecting sleeve 6 drives the handle 4 to rotate using the snap-fit ​​block 41. The handle 4 drives the pump rod body 3 to rotate synchronously. When the drive block 53 abuts against the right limit block 552, the liquid passage groove 7 aligns with the liquid outlet hole 12. Then, the handle 4 is pushed inward, and the handle 4 drives the snap-fit ​​block 41 to slide along the snap-fit ​​groove 61, causing the handle 4 and the connecting sleeve 6 to slide relative to each other. At the same time, the handle 4 drives the pump rod body 3 to move synchronously, so that the liquid between the thin rod 32 and the upper hole 21 is discharged along the liquid passage groove 7 and the liquid outlet hole 12, completing the liquid discharge.

[0035] Since the drive block 53, the left limit block 551 and the right limit block 552 are all located outside the pump sleeve body 1, the positional relationship between the drive block 53, the left limit block 551 and the right limit block 552 can be used to make it easier to observe whether the pump rod body 3 has rotated into place, thus reducing the possibility of inaccurate fluid metering.

[0036] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A micro-liquid supply device, comprising a pump sleeve body and a pump rod body, wherein a pump rod hole is formed in the pump sleeve body, one end of the pump rod body is inserted into the pump rod hole, and a handle is fixedly provided at the other end of the pump rod body, characterized in that: A drive gear is sleeved on the handle, and the drive gear is slidably connected to the handle and rotatably connected to the pump sleeve body. A drive seat is fixedly installed on the pump sleeve body, and a drive groove is opened on the drive seat. A drive block is slidably installed in the drive groove, and a drive rack is fixedly installed on the drive block. The drive rack meshes with the drive gear. A left limit block and a right limit block are installed in the drive groove, and the drive block is located between the left limit block and the right limit block. The opposing surfaces of the left limit block and the right limit block are both used to abut against the drive block.

2. The micro-liquid supply device according to claim 1, characterized in that: A connecting sleeve is fitted onto the handle, and the connecting sleeve is rotatably connected to the pump sleeve body. The connecting sleeve is for the pump rod body to be inserted. The drive gear is fitted onto the connecting sleeve and is fixedly connected to the connecting sleeve. Several snap-fit ​​grooves are opened through the inner wall of the connecting sleeve. The snap-fit ​​grooves penetrate the end wall of the connecting sleeve. Snap-fit ​​blocks are slidably arranged in the snap-fit ​​grooves and are fixedly connected to the handle.

3. The micro-liquid supply device according to claim 1, characterized in that: A drive screw is rotatably arranged between the left and right limit blocks, and the drive block is threadedly connected to the drive screw.

4. The micro-liquid supply device according to claim 1, characterized in that: Flexible pads are fixedly provided on the opposite surfaces of the left and right limiting blocks, and the flexible pads are used to abut against the driving block.

5. A micro-liquid supply device according to claim 1, characterized in that: The pump sleeve body has an inlet hole and an outlet hole on its side wall, both of which are connected to the pump rod hole. The pump rod body has a liquid passage groove on its side wall.

6. A micro-liquid supply device according to claim 5, characterized in that: The pump rod hole includes an upper hole and a lower hole. The bottom end of the upper hole is connected to the top end of the lower hole. The diameter of the upper hole is larger than that of the lower hole. The inlet and outlet holes are both connected to the upper hole. The lower hole is located below the inlet and outlet holes. The pump rod body includes a thick rod and a thin rod. The bottom end of the thick rod is fixedly connected to the top end of the thin rod. The thick rod forms a slidable liquid-tight fit with the upper hole, and the thin rod forms a slidable liquid-tight fit with the lower hole. The liquid passage groove is formed on the side wall of the thick rod, and the bottom end of the liquid passage groove is located at the connection between the thick rod and the thin rod.

7. A micro-liquid supply device according to claim 5, characterized in that: A housing is fitted onto the pump sleeve body, and the housing is fixedly connected to the pump sleeve body. The housing is provided with an inlet nozzle and an outlet nozzle. The inlet nozzle communicates with the inlet hole, and the outlet nozzle communicates with the outlet hole. The bottom of the housing is flush with the bottom of the pump sleeve body. An end cap is fixedly provided at the bottom of the housing. A countersunk hole is opened on the side of the end cap facing the pump sleeve body, and a through hole is opened on the side of the end cap away from the pump sleeve body. The through hole communicates with the countersunk hole.

8. A micro-liquid supply device according to claim 7, characterized in that: A rubber pad is fixedly installed inside the countersunk hole.

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