Plunger pump capable of reducing shearing force

Abstract

The utility model discloses a plunger pump capable of reducing shearing force, which belongs to the technical field of plunger pumps and comprises a plunger pump shell, a suction inlet, a discharge port and a low-shearing-force groove valve metering rod, the inside of the plunger pump shell is of a hollow structure, the suction inlet is arranged on the outer side wall of the plunger pump shell, the discharge port is arranged on the outer side wall of the plunger pump shell, and the low-shearing-force groove valve metering rod is arranged in the plunger pump shell. And the low-shearing-force groove valve metering rod is movably connected to the interior of the plunger pump shell. The problem that in the prior art, when a groove valve metering rod rotates at a high speed, high shearing force can be generated on flowing liquid, and therefore physical performance or biological activity changes of effective components of individual medicine are caused is solved. According to the utility model, the high-efficiency precise filling is realized while the fluid quality is protected, the technical progress and the practical application value are obvious, and the urgent requirements in the high-precision fluid conveying fields such as pharmacy and food are met.

Description

Technical Field

[0001] This utility model relates to the field of plunger pump technology, and specifically to a plunger pump that reduces shear force. Background Technology

[0002] The grooved valve plunger pump is a high-precision metering pump widely used in pharmaceutical and food industries for precise volumetric filling of liquids. It controls the switching between the liquid's intake and discharge channels through the rotation of an internal grooved valve metering rod, thus achieving high-precision quantitative filling. This type of pump typically consists of a pump sleeve, a grooved valve metering rod that rotates within the pump sleeve, and key components such as an intake port and an outlet port. Its working principle is as follows: the pump sleeve pulls down, drawing in a measured amount of liquid. After this, the grooved valve metering rod rotates at a certain angle, aligning the grooved valve on the rod with the outlet port on the pump sleeve. The pump sleeve then rises a certain distance, discharging the measured amount of liquid, completing one filling cycle.

[0003] However, in existing slotted valve plunger pumps, to achieve higher filling frequencies, the rotational angular velocity of the slotted valve metering rod is generally set to the maximum value for stable operation. This results in high shear forces on the flowing liquid due to the high surface linear velocity of the metering rod during high-speed rotation. These shear forces can easily cause changes in the physicochemical properties or biological activities of individual drug active ingredients, typically manifesting as reduced drug bioactivity, the formation of insoluble particles, disruption of emulsion stability or microparticle encapsulation structure, severely impacting product quality and safety.

[0004] Therefore, how to provide a plunger pump that reduces shear force and overcomes the shortcomings of the existing technology is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] Therefore, this utility model provides a plunger pump that reduces shear force, in order to solve the problem in the prior art that the high shear force generated on the flowing liquid by the metering rod of the slot valve when it rotates at high speed causes changes in the physical and chemical properties or biological activities of some active pharmaceutical ingredients.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model discloses a plunger pump that reduces shear force, comprising:

[0008] The piston pump housing has a hollow internal structure.

[0009] The suction inlet is located on the outer wall of the plunger pump housing;

[0010] The discharge port is located on the outer wall of the piston pump housing;

[0011] The low shear groove valve metering rod is movably connected inside the plunger pump housing.

[0012] Furthermore, the low shear groove valve metering rod includes:

[0013] The filling sealing section is a cylindrical structure and is located inside the plunger pump housing;

[0014] An air-blocking section is provided at the top of the filling and sealing section and is integrally formed with the filling and sealing section. The air-blocking section is always located outside the piston pump housing.

[0015] A connector is provided at the top of the clearance section;

[0016] The first slot valve is located on the side wall of the filling sealing section;

[0017] The second valve is located on the side wall of the filling sealing section.

[0018] Furthermore, a circular hole is provided at the bottom of the filling and sealing section, and the circular hole is connected to the first slot valve and the second slot valve.

[0019] Furthermore, the diameter of the metering rod of the low shear force slot valve is δ, where δ < 12 mm; the included angle between the second slot valve and the first slot valve is β, where β = 90°.

[0020] Furthermore, the diameter of the metering rod of the low shear force slot valve is δ, 12mm < δ < 18mm; the included angle between the second slot valve and the first slot valve is β, 45° < β ≤ 90°.

[0021] Furthermore, the diameter of the metering rod of the low shear force slot valve is δ, where δ > 18 mm; the included angle between the second slot valve and the first slot valve is β, where 15° < β ≤ 90°.

[0022] Furthermore, the included angle between the inlet and outlet is α, where 90°≤α≤180°.

[0023] This utility model has the following advantages:

[0024] This invention significantly reduces the rotation angle required for the metering rod of the low-shear valve to switch channels by adding a second valve to the metering rod and appropriately setting the angle between the second valve and the first valve. At the same filling frequency, this structure effectively reduces the linear velocity of rotation, thereby directly reducing the shear force on the flowing liquid and avoiding physical or biological damage to shear-sensitive media.

[0025] By adding a circular hole at the bottom of the filling sealing section that connects to the first and second slot valves, the length of the slot valve opening is shortened, further reducing the area of ​​shear action with the liquid, reducing the overall shear effect, and facilitating liquid flow, thereby improving filling efficiency. Attached Figure Description

[0026] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely illustrative, and those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0027] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0028] Figure 1 A front sectional view of the plunger pump for reducing shear force provided by this utility model;

[0029] Figure 2 The utility model provides Figure 1 Cross-sectional view at point AA;

[0030] Figure 3 A diagram showing the suction state of a plunger pump for reducing shear force, provided by this utility model.

[0031] Figure 4 A diagram showing the discharge state of a plunger pump for reducing shear force, provided by this utility model.

[0032] Figure 5 Top view of the inlet and outlet provided in the first embodiment of this utility model;

[0033] Figure 6 A top view of the inlet and outlet provided in the second embodiment of this utility model;

[0034] Figure 7 A top view of the inlet and outlet provided in the third embodiment of this utility model.

[0035] In the diagram: 1. Piston pump housing; 2. Suction port; 3. Discharge port; 4. Low shear groove valve metering rod; 41. Filling sealing section; 42. Air vent section; 43. Connecting piece; 44. First groove valve; 45. Second groove valve; 46. Circular hole. Detailed Implementation

[0036] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can readily understand the other advantages and benefits of the present invention from the contents disclosed in this specification. Obviously, the embodiments described are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0037] Please refer to Figures 1-7 The present invention discloses a plunger pump for reducing shear force. The present invention consists of four parts, as follows: Figure 1 , Figure 3 , Figure 4 As shown, the device includes a plunger pump housing 1, a suction port 2, a discharge port 3, and a low shear groove valve metering rod 4. The plunger pump housing 1 has a hollow internal structure. The suction port 2 is located on the outer wall of the plunger pump housing 1, and the discharge port 3 is located on the outer wall of the plunger pump housing 1. The low shear groove valve metering rod 4 is movably connected to the inside of the plunger pump housing 1.

[0038] The main structural components of this utility model include: a high-precision plunger pump housing 1 and a high-precision low-shear groove valve metering rod 4. The plunger pump housing 1 has a precision-machined cavity with high cylindricity and excellent surface roughness. The side wall of the plunger pump housing 1 has two liquid passage ports, namely an inlet 2 and an outlet 3. The upper end of the low-shear groove valve metering rod 4 is connected to a drive mechanism, which drives the low-shear groove valve metering rod 4 to rotate inside the plunger pump housing 1. A connecting structure is provided at the bottom of the plunger pump housing 1, which drives the plunger pump housing 1 to move up and down.

[0039] By setting the low shear force groove valve metering rod 4, the rotation angle of the low shear force groove valve metering rod 4 can be reduced, thereby achieving a smaller rotation angle in the same amount of time, reducing linear velocity, and reducing shear force.

[0040] Preferred, such as Figure 5 , Figure 6 , Figure 7 As shown, the included angle between the intake port 2 and the exhaust port 3 is α, where 90°≤α≤180°. The included angle between the intake port 2 and the exhaust port 3 is typically 90°, 120°, or 180°. Figure 5 , Figure 6 , Figure 7 These are three embodiments of the present utility model. Figure 5 For 180°, Figure 6 For 90°, Figure 7 It is 120°.

[0041] like Figure 1 , Figure 2 As shown, the low shear force groove valve metering rod 4 includes a filling sealing section 41, a clearance section 42, a connector 43, a first groove valve 44, and a second groove valve 45. The filling sealing section 41 is a cylindrical structure and is located inside the plunger pump housing 1. The clearance section 42 is located on top of the filling sealing section 41 and is integrally formed with the filling sealing section 41. The clearance section 42 is always located on the outside of the plunger pump housing 1. The connector 43 is located on top of the clearance section 42. The first groove valve 44 is opened on the side wall of the filling sealing section 41, and the second groove valve 45 is opened on the side wall of the filling sealing section 41.

[0042] In this embodiment, the structures of the filling sealing section 41, the air-proof section 42, the connecting piece 43, the first slot valve 44, and the second slot valve 45 are as follows: Figure 1 , Figure 2 As shown, the connector 43 is connected to the drive mechanism to realize the functions of fixed connection and drive transmission. The low shear force groove valve metering rod 4 consists of the following parts: the connector 43 at the upper end, the clearance section 42 in the middle, the filling and sealing section 41 at the lower end, and the first groove valve 44 opened on the filling and sealing section 41.

[0043] The first slot valve 44 is the channel for switching the filling liquid. It is a slot opened at the lower end of the filling sealing section 41. The length of the slot is related to the total length of the pump and depends on the filling stroke. The first slot valve 44 does not penetrate the filling sealing section 41 and the upper part is still cylindrical. The length of the non-penetrating part is usually 20-45MM to ensure the effectiveness of the filling seal.

[0044] To achieve a higher filling frequency (the number of filling actions completed per unit time), we adjusted the rotational angular velocity of the low-shear groove valve metering rod 4 to its maximum value for stable operation. With equal angular velocities, a larger diameter low-shear groove valve metering rod 4 results in a higher linear velocity and greater shear force during operation. A second groove valve 45 at a certain angle is added to the filling sealing section 41; for example, if the angle between the two liquid passage openings on the plunger pump housing 1 is 180°, we can set the angle between the first groove valve 44 and the second groove valve 45 to 90°.

[0045] The second slot valve 45 has the same shape and height as the first slot valve 44, the difference being that the second slot valve 45 and the first slot valve 44 form a certain angle β. By adding the second slot valve 45 to the low shear valve metering rod 4 and reasonably setting the included angle between it and the first slot valve 44, the rotation angle required for the low shear valve metering rod 4 to switch channels is significantly reduced. At the same filling frequency, this structure effectively reduces the linear velocity of rotation, thereby directly reducing the shear force on the flowing liquid and avoiding physical or biological damage to shear-sensitive media.

[0046] like Figure 1 , Figure 2 As shown, a circular hole 46 is provided at the bottom of the filling and sealing section 41, and the circular hole 46 is connected to the first slot valve 44 and the second slot valve 45.

[0047] In this embodiment, a hollow liquid channel—a circular hole 46 (or other shapes of holes, usually circular for ease of machining)—is added to the lower end of the filling and sealing section 41. The circular hole 46 communicates with the lower ends of the first slot valve 44 and the second slot valve 45. The outer surface of the circular hole 46 does not have a groove, meaning that the first slot valve 44 and the second slot valve 45 only occupy the middle section of the filling and sealing section 41. The circular hole 46 reduces the length of the grooves in the first slot valve 44 and the second slot valve 45, typically reducing the total groove length by more than 20 mm, further reducing shear force.

[0048] By adding a circular hole 46 at the bottom of the filling sealing section 41 that communicates with the first slot valve 44 and the second slot valve 45, the length of the slot valve opening is shortened, further reducing the area of ​​shear action with the liquid, reducing the overall shear effect, and facilitating liquid flow and improving filling efficiency.

[0049] As one possible embodiment, the diameter of the low shear force groove valve metering rod 4 is δ, where δ < 12 mm; the included angle between the second groove valve 45 and the first groove valve 44 is β, where β = 90°.

[0050] As one possible embodiment, the diameter of the low shear force groove valve metering rod 4 is δ, 12mm < δ < 18mm; the included angle between the second groove valve 45 and the first groove valve 44 is β, 45° < β ≤ 90°.

[0051] As one possible embodiment, the diameter of the low shear force groove valve metering rod 4 is δ, where δ > 18 mm; the included angle between the second groove valve 45 and the first groove valve 44 is β, where 15° < β ≤ 90°.

[0052] Normally, when the diameter of the low-shear valve metering rod 4 is less than 12mm, we set the included angle between the first valve 44 and the second valve 45 to 90 degrees; when the diameter of the low-shear valve metering rod 4 is greater than 12mm but less than 18mm, we set the included angle between the first valve 44 and the second valve 45 to 90 degrees or less than 90 degrees but greater than 45 degrees; when the diameter of the low-shear valve metering rod 4 is greater than 18mm, we set the included angle between the first valve 44 and the second valve 45 to 90 degrees or less than 90 degrees but greater than 15 degrees. The specific included angle is determined based on the diameter of the low-shear valve metering rod 4 and the opening width of the first valve 44 and the second valve 45. The principle is to make the included angle smaller while ensuring a seal.

[0053] The advantage of this approach is that the included angle between the two valve slots is specifically optimized according to the different diameters of the metering rod, ensuring that good sealing performance is maintained under different specifications and operating conditions while minimizing shear force, thereby improving the pump's applicability and reliability.

[0054] The usage process of this utility model embodiment is as follows:

[0055] The filling channel is switched by the reciprocating rotation of the low shear groove valve metering rod 4. When the first groove valve 44 on the low shear groove valve metering rod 4 is aligned with the suction port 2 on the plunger pump housing 1, the plunger pump housing 1 is pulled down to draw in liquid. After a certain amount of liquid is drawn in, the low shear groove valve metering rod 4 rotates at a certain angle, so that the second groove valve 45 on the low shear groove valve metering rod 4 is aligned with the discharge port 3. The plunger pump housing 1 rises a certain distance to discharge a certain amount of liquid, completing one filling action.

[0056] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A plunger pump for reducing shear force, characterized in that, include: The plunger pump housing (1) has a hollow internal structure; The suction port (2) is located on the outer wall of the piston pump housing (1); The discharge port (3) is located on the outer wall of the piston pump housing (1); The low shear groove valve metering rod (4) is movably connected inside the piston pump housing (1); The low shear groove valve metering rod (4) includes: The filling sealing section (41) is a cylindrical structure and is located inside the plunger pump housing (1); An air-blocking section (42) is provided on top of the filling sealing section (41) and integrally formed with the filling sealing section (41). The air-blocking section (42) is always located outside the piston pump housing (1). A connector (43) is provided at the top of the clearance section (42); The first groove valve (44) is located on the side wall of the filling sealing section (41); The second groove valve (45) is provided on the side wall of the filling sealing section (41); The bottom of the filling sealing section (41) is provided with a round hole (46), which is connected to the first slot valve (44) and the second slot valve (45).

2. The plunger pump with reduced shear force as described in claim 1, characterized in that, The diameter of the low shear force groove valve metering rod (4) is δ, δ < 12 mm; the included angle between the second groove valve (45) and the first groove valve (44) is β, β = 90°.

3. The plunger pump with reduced shear force as described in claim 1, characterized in that, The diameter of the low shear force groove valve metering rod (4) is δ, 12mm < δ < 18mm; the included angle between the second groove valve (45) and the first groove valve (44) is β, 45° < β ≤ 90°.

4. The plunger pump with reduced shear force as described in claim 1, characterized in that, The diameter of the low shear force slot valve metering rod (4) is δ, δ > 18 mm; the included angle between the second slot valve (45) and the first slot valve (44) is β, 15° < β ≤ 90°.

5. The plunger pump with reduced shear force as described in claim 1, characterized in that, The included angle between the inlet (2) and the outlet (3) is α, where 90°≤α≤180°.

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