Filling metering pump with guide structure

Abstract

The utility model discloses a filling metering pump with a guide structure, which belongs to the technical field of plunger pumps and comprises a pump sleeve, a rotary valve rod, an extended sealing sleeve, a plunger rod and a multi-petal guide structure, the pump sleeve is of a cylindrical structure with two open ends, and a suction inlet and a discharge outlet are oppositely arranged on the outer side wall of the pump sleeve. The rotary valve rod is movably connected to the interior of the pump sleeve, the extended sealing sleeve is installed at an opening in the lower end of the pump sleeve and communicated with the interior of the pump sleeve, a cleaning and sterilizing opening is formed in the outer side wall of the extended sealing sleeve, the plunger rod is slidably connected to the interior of the extended sealing sleeve, and the multi-petal-shaped guide structures are arranged in pairs. And the two springs are respectively arranged on the outer side walls of the rotary valve rod and the plunger rod. The problems that in the prior art, when a traditional filling metering pump carries out the CIP / SIP function, a plunger rod and a rotary valve rod collide when entering a pump sleeve, so that the plunger rod and the rotary valve rod are prone to being blocked in the station switching process, and abnormal sound and abrasion are generated are solved. The utility model has the advantages of strong versatility and wide application prospect.

Description

Technical Field

[0001] This utility model relates to the field of plunger pump technology, and specifically to a filling metering pump with a guiding structure. Background Technology

[0002] A metering pump is a key piece of equipment used in industries such as pharmaceuticals, food, and chemicals for the precise, volumetric dispensing of liquids. Its core component is a plunger pump, which uses the precise reciprocating motion of the plunger within the pump chamber to achieve liquid intake and discharge. To meet hygienic production standards, modern metering pumps generally integrate cleaning-in-line (CIP) and sterilization-in-line (SIP) functions, enabling thorough cleaning and sterilization of the pump's internal flow channels when changing batches or products, effectively preventing cross-contamination and ensuring product safety.

[0003] However, existing washable plunger pumps still have certain structural design flaws. To switch between filling and cleaning / sterilization functions, the plunger rod and rotary valve rod need to reciprocate within the pump sleeve and switch between different positions. In traditional designs, large chamfers are usually machined at the ends of the plunger rod and rotary valve rod, and a flared structure is set at the corresponding position in the pump sleeve for auxiliary guidance. In practical applications, this method is prone to jamming, impact, or abnormal noise when the plunger rod and rotary valve rod enter the pump sleeve due to concentricity deviations or assembly errors. Long-term operation can also cause wear in the chamfer and flared areas, generating particulate contaminants, which seriously affects the purity and safety of the filled liquid. Furthermore, this structure requires extremely high alignment accuracy of the drive system, increasing manufacturing and maintenance costs.

[0004] Therefore, how to provide a filling metering pump with a guiding structure to overcome the defects in the existing technology is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] To address this issue, this utility model provides a filling metering pump with a guiding structure to solve the problem in the prior art where, during the CIP / SIP function of a traditional filling metering pump, the plunger rod and rotary valve rod collide when entering the pump sleeve, causing jamming, abnormal noise, and wear during station switching.

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

[0007] This utility model discloses a filling metering pump with a guiding structure, comprising:

[0008] The pump sleeve is a cylindrical structure with openings at both ends. An inlet and an outlet are provided opposite to each other on the outer side wall of the pump sleeve.

[0009] A rotary valve stem is movably connected inside the pump sleeve;

[0010] An extended sealing sleeve is installed at the lower opening of the pump sleeve. The extended sealing sleeve is connected to the inside of the pump sleeve, and a cleaning and sterilization port is provided on the outer side wall of the extended sealing sleeve.

[0011] The plunger rod is slidably connected inside the extended sealing sleeve;

[0012] Multi-lobed guide structures are arranged in pairs and respectively disposed on the outer side walls of the rotary valve stem and the plunger stem.

[0013] Furthermore, the rotary valve stem includes:

[0014] The drive connection part has a sealing part formed on its side wall;

[0015] The guide portion is located below the drive connection portion, and the multi-lobed guide structure is formed on the outer wall of the guide portion;

[0016] An air-blocking section is provided below the guide section;

[0017] A filling and sealing part is provided below the void portion. The side wall of the filling and sealing part is provided with a liquid channel hole and an intermediate channel opening, and the liquid channel hole and the intermediate channel opening are internally connected.

[0018] Furthermore, the plunger rod includes:

[0019] The connecting part has a sealing surface formed on its side wall;

[0020] A filling section is disposed above the connecting section, and the multi-lobed guide structure is formed on the outer side wall of the end of the filling section.

[0021] Furthermore, the multi-lobed guide structure consists of several slots with rounded transitions.

[0022] Furthermore, the number of slots in the multi-lobed guide structure is at least 4 and at most 20.

[0023] Furthermore, a drain port is provided on the outer wall of the pump sleeve.

[0024] Furthermore, a fixing position for connecting the pump sleeve is provided on the outer wall of the pump sleeve.

[0025] Furthermore, the inner wall of the pump sleeve is formed with steps one, two and three arranged sequentially from top to bottom, and the inner wall of the extended sealing sleeve is formed with step four.

[0026] This utility model has the following advantages:

[0027] This invention provides effective radial guidance and self-centering for the two moving parts as they enter and exit the pump sleeve by setting multi-lobed guide structures on the rotary valve stem and plunger rod. This eliminates jamming, impact, and friction noise during station switching, ensuring smooth and reliable pump transitions between filling and cleaning / sterilization states. It significantly reduces the risk of equipment downtime and component damage due to pump jamming. Furthermore, the guiding capability of the multi-lobed guide structure itself reduces the stringent requirements for the concentricity of the entire drive system, allowing for more precise machining and assembly adjustments of the drive mechanism. This effectively lowers the system's manufacturing and subsequent maintenance costs.

[0028] Without affecting the pump body's original online cleaning and online sterilization functions, it significantly reduces wear on the ends of the rotary valve stem and plunger rod, as well as the precision surfaces inside the pump sleeve, reducing the generation of metal or ceramic shavings. This effectively prevents particulate contaminants from mixing into the filled medicines or food, greatly improving the purity and hygiene safety of the product. Attached Figure Description

[0029] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0030] 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.

[0031] Figure 1 A cross-sectional view of a filling metering pump with a guiding structure provided by this utility model;

[0032] Figure 2 Cross-sectional view of the pump sleeve and extended sealing sleeve provided by this utility model;

[0033] Figure 3 A comparison diagram of the filling function usage status provided by this utility model;

[0034] Figure 4 A comparison diagram of the filling function and CIP / SIP function switching provided by this utility model.

[0035] In the diagram: 1. Pump sleeve; 11. Suction port; 12. Discharge port; 13. Sewage outlet; 14. Fixed position; 16. Step four; 17. Step one; 18. Step two; 19. Step three; 2. Rotary valve stem; 21. Drive connection; 22. Sealing part; 23. Guide part; 24. Air vent; 25. Filling sealing part; 26. Liquid channel hole; 27. Intermediate channel opening; 3. Extended sealing sleeve; 31. Cleaning and sterilization port; 4. Plunger rod; 41. Connection part; 42. Sealing surface; 43. Filling part; 5. Multi-lobed guide structure. Detailed Implementation

[0036] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0037] Please refer to Figures 1-4 The present invention discloses a filling metering pump with a guiding structure, which consists of five parts, as follows: Figure 1 As shown, the pump includes a pump sleeve 1, a rotary valve stem 2, an extended sealing sleeve 3, a plunger rod 4, and a multi-lobed guide structure 5. The pump sleeve 1 is a cylindrical structure with openings at both ends. An inlet 11 and an outlet 12 are oppositely arranged on the outer wall of the pump sleeve 1. The rotary valve stem 2 is movably connected inside the pump sleeve 1. The extended sealing sleeve 3 is installed at the lower opening of the pump sleeve 1 and communicates with the interior of the pump sleeve 1. A cleaning and sterilization port 31 is provided on the outer wall of the extended sealing sleeve 3. The plunger rod 4 is slidably connected inside the extended sealing sleeve 3. The multi-lobed guide structures 5 are arranged in pairs, respectively on the outer walls of the rotary valve stem 2 and the plunger rod 4. Preferably, a drain port 13 is provided on the outer wall of the pump sleeve 1. Figure 2 As shown, the inner wall of the pump sleeve 1 is formed with steps 17, 18 and 19 arranged sequentially from top to bottom, and the inner wall of the extended sealing sleeve 3 is formed with step 4 16.

[0038] The extended sealing sleeve 3 and the pump sleeve 1 are usually two separate parts, directly connected by a chuck or nut to ensure a high degree of coaxiality between them. The lower end of the extended sealing sleeve 3 has an annular groove, inside which an O-ring is installed. The extended sealing sleeve 3 and the plunger rod 4 can achieve sealing and pressure bearing through the O-ring in this annular groove. The pump sleeve 1 and the extended sealing sleeve 3 combine to form a hollow cavity sleeve with multiple stepped structures, typically four steps: step one 17, step two 18, step three 19, and step four 16. Usually, step four 16, i.e., Figure 1At the junction of the pump sleeve 1 and the extended sealing sleeve 3, there is also an annular groove for placing an O-ring seal, and an O-ring seal is also installed inside it.

[0039] Typically, the diameter of step four 16 is larger than that of step one 17, the diameter of step two 18 is larger than that of step one 17, and the diameter of step two 18 is larger than that of step three 19. Step four 16 has a cleaning and sterilization port 31, which can serve as both an inlet and outlet for cleaning and sterilization. Step one 17 is a cylindrical surface with extremely high cylindricity that has been precisely machined; it is the sealing surface 42 of the rotary valve that enables the filling function. Step three 19 is also a cylindrical surface with extremely high cylindricity that has been precisely machined; it is the sealing surface 42 of the plunger rod 4 that enables the filling function. The length of these stepped functional areas is subject to strict requirements and is determined based on the pump's filling stroke and the implementation of the CIP / SIP function.

[0040] Preferably, a fixing position 14 for connecting the pump sleeve 1 is provided on the outer side wall. The fixing position 14 is provided on the outer side wall of the pump sleeve 1, and the pump sleeve 1 is connected through the fixing position 14. There are various installation and positioning methods, which will not be described in detail.

[0041] like Figure 1 As shown, the rotary valve stem 2 includes a drive connection part 21, a guide part 23, a clearance part 24, and a filling and sealing part 25. A sealing part 22 is formed on the side wall of the drive connection part 21. The guide part 23 is located below the drive connection part 21. A multi-lobed guide structure 5 is formed on the outer side wall of the guide part 23. The clearance part 24 is located below the guide part 23. The filling and sealing part 25 is located below the clearance part 24. A liquid channel hole 26 and an intermediate channel opening 27 are formed on the side wall of the filling and sealing part 25. The liquid channel hole 26 and the intermediate channel opening 27 are internally connected.

[0042] The rotary valve stem 2 includes multiple functional parts, with its top end being a drive connection part 21 connected to an external drive device. The connection between the drive connection part 21 and the external drive device is existing technology in the field, and there are various ways to do so, which will not be described in detail here. From top to bottom, the parts are a sealing part 22 and a clearance part 24. The sealing part 22 is also a sealing structure that realizes the CIP / SIP function.

[0043] The multi-lobed guide structure 5 and the filling sealing part 25 protected in this application are typically larger in diameter than the filling sealing part 25, and smaller in diameter than the clearance part 24. The diameter of the multi-lobed guide structure 5 is only slightly smaller than the diameter of the filling sealing part 25, usually by 0.02-0.10 mm. The filling sealing part 25 on the rotary valve stem 2 has a liquid channel hole 26 and an intermediate channel opening 27, which are connected.

[0044] like Figure 1 As shown, the plunger rod 4 includes a connecting part 41 and a filling part 43. A sealing surface 42 is formed on the side wall of the connecting part 41. The filling part 43 is disposed above the connecting part 41. A multi-lobed guide structure 5 is formed on the outer side wall of the end of the filling part 43.

[0045] The multi-lobed guide structure 5 is located at the end of the plunger rod 4. The plunger rod 4 typically consists of three parts: its lowest end is a connecting part 41 that connects to an external drive device. The connecting part 41 is existing technology in this field, and its structure and arrangement vary, so it will not be described in detail here. The sealing surface 42 contacts and seals the O-ring at the lower end of the extended sealing sleeve 3 during CIP / SIP operation, preventing communication with the outside. The filling part 43 is a precision-machined cylindrical plunger with extremely high surface finish and high concentricity with the sealing surface 42. Unlike traditional products, we have added a multi-lobed guide structure 5 to the upper end of the plunger rod 4.

[0046] like Figure 1 , Figure 2 As shown, the multi-lobed guide structure 5 consists of several slots with rounded transitions. Preferably, the multi-lobed guide structure 5 has at least 4 slots and at most 20 slots.

[0047] In this embodiment, the multi-lobed guide structure 5 consists of several slots with rounded transitions, typically 4-20, which can be adjusted according to the diameter.

[0048] The multi-lobed guide structure 5, which is provided on the guide portion 23 of the rotary valve stem 2, has a circle whose outer diameter is slightly smaller than the diameter of the filling sealing portion 25, typically by 0.02-0.10 mm.

[0049] The multi-lobed guide structure 5, which is located at the end of the filling section 43 of the plunger rod 4, has a groove whose outer circle has a diameter that is slightly smaller than the main body diameter of the filling section 43, typically by 0.02-0.10 mm.

[0050] The above examples illustrate the application of this invention's technical solution in rotary valve plunger pumps. This invention's technical solution can also be applied to:

[0051] 1. The grooved valve type plunger pump with CIP / SIP function can also use the technical solution applied in the application to apply the multi-lobe structure guide structure to the plunger rod 4;

[0052] 2. A double-step piston pump with CIP / SIP function (also known as a volumetric differential piston pump) can also use the technical solution of this application, applying the multi-lobed guide structure to the piston rod 4;

[0053] 3. One-way valve plunger pump: To achieve CIP / SIP function, a multi-lobed guide structure can also be applied to the plunger rod 4.

[0054] In summary, the multi-lobed guide structure 5 of this application can function when the position switching guidance of any type of plunger pump is performed.

[0055] The working principle of this utility model embodiment is as follows:

[0056] A. Filling function implementation (during filling, the multi-lobed guide structure 5 has no effect):

[0057] like Figure 3 As shown, the filling sealing part 25 of the rotary valve rod 2 contacts the step 17 on the pump sleeve 1, and the two cylindrical surfaces are in contact and sealed; the filling part 43 of the plunger rod 4 contacts the step 19 on the pump sleeve 1, and the two cylindrical surfaces are in contact and sealed; at this time, the rotary valve rod 2 and the plunger rod 4 are close to each other with a distance of A, which is approximately 2-3 mm. The liquid passage hole 26 is aligned with the suction port 11. The plunger rod 4 is pulled down a certain distance (not exceeding the maximum stroke limit S of the pump, usually not exceeding 45 mm) to draw in liquid; the rotary valve rod 2 rotates a certain angle, the liquid passage hole 26 is aligned with the discharge port 12, the plunger rod 4 rises a certain distance to the initial position, and the liquid is discharged from the discharge port 12, completing one filling action.

[0058] B. Switching from filling function to CIP / SIP function

[0059] like Figure 4 As shown, after filling is completed, online cleaning and sterilization are required. The relative positions must be changed in the following order to switch to the CIP / SIP functional area in order to achieve online cleaning and sterilization.

[0060] Pump sleeve 1 rises a certain distance, while plunger rod 4 is pulled down a certain distance and enters the extended sealing sleeve 3. At this time, the sealing part 22 on the rotary valve rod 2 contacts and seals the upper end of pump sleeve 1. The multi-lobed guide structure 5 on the rotary valve rod 2 is located at the lower end of step 17 on pump sleeve 1 (usually about 10 mm in length). Because the outer diameter of the multi-lobed guide structure 5 is slightly smaller than the inner diameter of step 17 (usually 0.02-0.10 mm smaller), the rotary valve rod 2 is in a semi-floating state in pump sleeve 1. The gap between them can be filled with cleaning water and sterilizing steam to ensure that it plays a guiding role when pulled upward. After the plunger rod 4 is pulled down a certain distance and enters the extended sealing sleeve 3, the multi-lobed guide structure 5 at the upper end of the plunger rod 4 is still at the lowest end of pump sleeve 1.

[0061] In the stepped 3 19, because the outer diameter of the multi-lobed guide structure 5 is slightly smaller than the inner diameter of the stepped 3 19 (usually 0.02-0.10 mm smaller), the plunger rod 4 is in a semi-floating state in the stepped 3 19. The gap between them can be filled with cleaning water and sterilizing steam to ensure that the plunger rod 4 is pushed into the pump sleeve 1, which plays a guiding role and enters very smoothly without jamming. At this time, the O-ring seal at the lower end of the extended sealing sleeve 3 contacts and seals the sealing surface 42 of the plunger rod 4. Thus, the rotary valve rod 2, the plunger rod 4, the pump sleeve 1, and the extended sealing sleeve are able to make the rotary valve rod 2, the plunger rod 4, the pump sleeve 1, and the extended sealing sleeve... A narrow, through-channel is formed between the three parts. In this state, only four ports are connected to the outside: the suction port 11, the discharge port 12, the drain port 13 on the pump sleeve 1, and the cleaning and sterilization port 31 on the extended sealing sleeve 3. Cleaning water and steam can be introduced into the cleaning and sterilization port 31 and the suction port 11 and discharged from the discharge port 12 and the drain port 13; or cleaning water and steam can be introduced into the suction port 11 and discharged from the cleaning and sterilization port 31, the discharge port 12, and the drain port 13, thereby realizing online cleaning and online sterilization.

[0062] C. Switching from CIP / SIP function to filling function

[0063] After online cleaning and sterilization, to switch back to the filling function, the relative positions must be changed in the following order.

[0064] C1. After the pump sleeve 1 descends a certain distance, during this movement, because the multi-lobed guide structure 5 on the rotary valve stem 2 plays a good guiding role, the multi-lobed guide structure 5 on the rotary valve stem 2 disengages from the step 17 inside the pump sleeve 1, and the sealing part 22 of the rotary valve stem 2 disengages from the upper end of the pump sleeve 1; at the same time, the multi-lobed guide structure 5 at the end of the plunger rod 4 plays a guiding role, smoothly guiding the filling part 43 of the plunger rod 4 into the pump sleeve 1, so that the filling part 43 of the plunger rod 4 fits with the step 19 of the pump sleeve 1, playing a filling and sealing role. At the same time, the sealing surface 42 at the lower end of the plunger rod 4 disengages from the O-ring at the lower end of the extended sealing sleeve 3, and no longer seals;

[0065] C2. Next, the plunger rod 4 rises a certain distance, so that the filling part 43 is in the pump sleeve 1 and the connecting part 41 is in the extended sealing sleeve 3. Through the above movement, it returns to the original filling position. At this time, the lower end of the rotating valve rod 2 and the upper end of the plunger rod 4 are 2-3 mm apart and do not contact or collide.

[0066] 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 filling metering pump with a guiding structure, characterized in that, include: The pump sleeve (1) is a cylindrical structure with openings at both ends. The outer side wall of the pump sleeve (1) is provided with an inlet (11) and an outlet (12). Rotary valve stem (2) is movably connected inside the pump sleeve (1); An extended sealing sleeve (3) is installed at the lower opening of the pump sleeve (1). The extended sealing sleeve (3) is connected to the inside of the pump sleeve (1). A cleaning and sterilization port (31) is provided on the outer side wall of the extended sealing sleeve (3). The plunger rod (4) is slidably connected inside the extended sealing sleeve (3); Multi-lobed guide structures (5) are arranged in pairs and respectively on the outer walls of the rotary valve stem (2) and the plunger rod (4).

2. The filling metering pump with a guiding structure as described in claim 1, characterized in that, The rotary valve stem (2) includes: The drive connection part (21) has a sealing part (22) formed on its side wall. The guide part (23) is disposed below the drive connection part (21), and the multi-lobed guide structure (5) is formed on the outer side wall of the guide part (23); An air-blocking section (24) is provided below the guide section (23); A filling and sealing part (25) is provided below the void part (24). A liquid channel hole (26) and an intermediate channel opening (27) are provided on the side wall of the filling and sealing part (25). The liquid channel hole (26) and the intermediate channel opening (27) are internally connected.

3. The filling metering pump with a guiding structure as described in claim 1, characterized in that, The plunger rod (4) includes: The connecting part (41) has a sealing surface (42) formed on its side wall. The filling section (43) is located above the connecting section (41), and the multi-lobed guide structure (5) is opened on the outer side wall of the end of the filling section (43).

4. The filling metering pump with a guiding structure as described in claim 1, characterized in that, The multi-lobed guide structure (5) consists of several slots with rounded transitions.

5. The filling metering pump with a guiding structure as described in claim 4, characterized in that, The number of slots in the multi-lobed guide structure (5) is at least 4 and at most 20.

6. The filling metering pump with a guiding structure as described in claim 1, characterized in that, A drain port (13) is provided on the outer wall of the pump sleeve (1).

7. The filling metering pump with a guiding structure as described in claim 1, characterized in that, A fixing position (14) for connecting the pump sleeve (1) is provided on the outer wall of the pump sleeve (1).

8. The filling metering pump with a guiding structure as described in claim 1, characterized in that, The inner wall of the pump sleeve (1) is formed with steps one (17), two (18) and three (19) arranged from top to bottom, and the inner wall of the extended sealing sleeve (3) is formed with step four (16).

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