Plunger rod with guide structure and plunger pump

Abstract

The utility model discloses a plunger rod with a guide structure and a plunger pump, and belongs to the technical field of plunger pumps, the plunger rod comprises a plunger rod main body and a multi-petal-shaped guide structure, the plunger rod main body is a multi-section cylindrical structure, the multi-petal-shaped guide structure is arranged on the outer side wall of the plunger rod main body, the multi-petal-shaped guide structure comprises a guide section and a plurality of notches which are formed in the axial direction of the guide section and have arc transition. The plunger pump solves the problems that in the prior art, when a traditional plunger pump conducts function switching, a plunger rod can collide when entering a pump sleeve, so that the plunger rod is prone to being blocked in the station switching process, and abnormal sound and abrasion are generated. The station switching device is high in universality, can be suitable for various precise filling metering pumps needing station switching, and is wide in application prospect.

Description

Technical Field

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

[0002] A plunger pump is a positive displacement pump that uses the reciprocating motion of a plunger rod within a pump casing to draw in and discharge liquids. It is widely used in precision volume filling processes in industries such as pharmaceuticals, food, and chemicals. To meet hygienic production requirements, modern plunger pumps often feature Clean In-Place (CIP) and Sterilize In-Place (SIP) functions, allowing for internal cleaning and high-temperature steam sterilization without disassembly. This effectively avoids cross-contamination and improves equipment efficiency and hygiene safety.

[0003] In plunger pumps with CIP / SIP functionality, the plunger rod needs to reciprocate between two main functional zones inside the pump housing: a smaller, precisely fitted filling and metering zone for high-precision volumetric metering, and a larger cleaning and sterilization zone to provide the space required for cleaning and sterilization. After cleaning and sterilization, the plunger rod needs to accurately and smoothly re-enter the filling and metering zone from the cleaning and sterilization zone to restore the filling function.

[0004] To switch between filling and cleaning / sterilization functions, the plunger rod needs to reciprocate within the pump sleeve and switch between different positions. Traditional designs typically involve machining a large chamfer at the end of the plunger rod and installing a flared structure at a corresponding position in the pump sleeve for guidance. In practical applications, this method is prone to causing the plunger rod to jam, impact, or make abnormal noises when entering the filling sealing section due to concentricity deviations or assembly errors. Long-term operation can also cause wear on the chamfer and flared areas, generating particulate contaminants and severely affecting the purity and safety of the filled liquid. Furthermore, this structure requires extremely high alignment precision from the drive system, increasing manufacturing and maintenance costs.

[0005] Therefore, how to provide a plunger rod 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

[0006] To address this issue, the present invention provides a plunger rod with a guiding structure to solve the problem in the prior art where, during function switching of a traditional plunger pump, the plunger rod impacts when entering the pump sleeve, leading to jamming, abnormal noise, and wear during station switching.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] This utility model discloses a plunger rod with a guiding structure, comprising:

[0009] The main body of the stopcock is a multi-segment cylindrical structure;

[0010] A multi-lobed guide structure is provided on the outer side wall of the piston rod body;

[0011] The multi-lobed guide structure includes a guide segment and several slots with arc transitions opened along the axial direction of the guide segment.

[0012] Furthermore, the piston rod body includes:

[0013] The connecting section is used to connect to an external drive mechanism;

[0014] The clearance section is a cylindrical structure, with one end connected to the connecting section;

[0015] A filling and metering sealing section is connected to the other end of the air-proof section.

[0016] Furthermore, the multi-lobed guide structure is disposed at the end of the filling metering sealing section.

[0017] Furthermore, the sidewall of the connecting section extends outward to form a sealing section, the multi-lobed guide structure is disposed between the sealing section and the air-proof section, and a slotted valve is provided on the outer sidewall of the filling metering sealing section.

[0018] Furthermore, a pump plug section is integrally formed at the end of the filling and metering sealing section, and the diameter of the pump plug section is larger than the diameter of the filling and metering sealing section.

[0019] Furthermore, the number of slots in the multi-lobed guide structure is at least four.

[0020] A one-way valve plunger pump includes a plunger rod with a guide structure, and further includes a one-way valve plunger pump sleeve body, wherein the plunger rod with the guide structure is slidably connected inside the one-way valve plunger pump sleeve body.

[0021] A grooved valve type plunger pump includes a plunger rod with a guide structure, and further includes a grooved valve type plunger pump sleeve body and a plunger pump plug. The plunger rod with the guide structure is slidably connected to one end of the grooved valve type plunger pump sleeve body, and the plunger pump plug is slidably connected to the other end of the grooved valve type plunger pump sleeve body.

[0022] A two-step plunger pump includes a plunger rod with a guide structure, and further includes a two-step plunger pump sleeve body, wherein the plunger rod with the guide structure is slidably connected inside the two-step plunger pump sleeve body.

[0023] This utility model has the following advantages:

[0024] This invention provides effective radial guidance and automatic centering for the plunger rod by setting a multi-lobed guide structure on the plunger rod, which effectively eliminates jamming, impact and friction noise that occur during station switching, ensuring smooth switching between filling and cleaning / sterilization states and reliable system operation, and significantly reducing the risk of equipment downtime and damage to core components caused by pump jamming.

[0025] Meanwhile, the centering and guiding capability of the multi-lobed guide structure reduces the dependence on the concentricity of the entire drive system, thereby relaxing the requirements of the drive mechanism in terms of machining accuracy and assembly adjustment, which helps to reduce system manufacturing costs and subsequent maintenance costs.

[0026] Furthermore, the multi-lobed guide structure significantly reduces wear on the precision-fitted surfaces of the plunger rod and pump sleeve without affecting the original online cleaning and sterilization functions of the plunger pump, reduces the generation of metal or ceramic shavings, effectively prevents particulate contaminants from mixing into the filled medicines or food, and greatly improves the purity and hygiene safety of the product. Attached Figure Description

[0027] 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.

[0028] 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.

[0029] Figure 1 This is a structural diagram of a plunger rod with a guide structure provided in the first embodiment of the present invention;

[0030] Figure 2 This is a functional state diagram of the one-way valve plunger pump CIP / SIP provided in the first embodiment of the present invention;

[0031] Figure 3 Provided for the first embodiment of this utility model Figure 2 Enlarged view of the A-structure;

[0032] Figure 4This is a structural diagram of a plunger rod with a guide structure provided in the second embodiment of the present invention;

[0033] Figure 5 This is a CIP / SIP functional state diagram of the grooved valve plunger pump provided in the second embodiment of the present invention;

[0034] Figure 6 This is a structural diagram of a plunger rod with a guide structure provided in the third embodiment of the present invention;

[0035] Figure 7 The CIP / SIP functional state diagram of the double-step plunger pump provided in the third embodiment of this utility model.

[0036] In the figure: 1. Plug rod body; 11. Connecting section; 111. Sealing section; 12. Air venting section; 13. Filling and metering sealing section; 131. Groove valve; 132. Pump plug section; 2. Multi-lobed guide structure; 21. Guide section; 22. Groove; 3. One-way valve type plunger pump sleeve body; 4. Groove valve type plunger pump sleeve body; 5. Plunger pump plug; 6. Double-step plunger pump sleeve body. Detailed Implementation

[0037] 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.

[0038] Please refer to Figure 1 , Figure 4 , Figure 6 The present invention discloses a plunger rod with a guide structure, which consists of two parts, as follows: Figure 1 , Figure 4 , Figure 6 As shown, the device includes a stopper rod body 1 and a multi-lobed guide structure 2. The stopper rod body 1 is a multi-segment cylindrical structure, and the multi-lobed guide structure 2 is disposed on the outer side wall of the stopper rod body 1. The multi-lobed guide structure 2 includes a guide segment 21 and a plurality of slots 22 with arc transitions opened along the axial direction of the guide segment 21. Preferably, the number of slots 22 in the multi-lobed guide structure 2 is at least four.

[0039] The plunger body 1 includes a connecting section 11, a clearance section 12, and a filling and metering sealing section 13. The connecting section 11 is used to connect to an external drive mechanism. The clearance section 12 is a cylindrical structure, with one end connected to the connecting section 11, and the filling and metering sealing section 13 is connected to the other end of the clearance section 12. The multi-lobed guide structure 2 includes a cylindrical guide section 21 and slots 22 formed on the outer wall of the guide section 21. These slots 22 all have rounded transitions, and the number is 4-20, depending on the diameter.

[0040] Figure 1 , Figure 4 , Figure 6 Three embodiments of this utility model are shown, all sharing the same basic structure, including a connecting section 11, a clearance section 12, and a filling and metering sealing section 13. The main difference lies in the placement of the multi-lobed guide structure 2. The connecting section 11 can be connected to an external drive mechanism to support the movement of the plunger rod; the clearance section 12 provides a controllable and necessary gap to avoid unnecessary friction and interference; the filling and metering sealing section 13 forms a sliding seal with the inner wall of the pump sleeve, together constituting a sealed, variable-volume pump chamber. Liquid intake and discharge are achieved through changes in the volume of this pump chamber. Since the volume change of the chamber is strictly proportional to the displacement distance of the plunger rod, the volume of liquid intake and discharge can be precisely controlled each time the plunger rod's stroke is precisely controlled.

[0041] By incorporating a multi-lobed guide structure 2 on the plunger rod, effective radial guidance and automatic centering are provided for the plunger rod during its movement in and out of the pump sleeve. This effectively eliminates jamming, impacts, and frictional noises that occur during station switching, ensuring smooth switching between filling and cleaning / sterilization states and reliable system operation. It significantly reduces the risk of equipment downtime and damage to core components caused by pump jamming. Furthermore, the multi-lobed guide structure 2, with its own centering and guiding capabilities, reduces the dependence on the concentricity of the entire drive system, thereby relaxing the requirements for machining accuracy and assembly adjustment of the drive mechanism, which helps reduce system manufacturing and subsequent maintenance costs.

[0042] The multi-lobed guide structure 2 significantly reduces wear on the precision-fitted surfaces of the plunger rod and pump sleeve without affecting the original online cleaning and sterilization functions of the plunger pump, reduces the generation of metal or ceramic shavings, effectively prevents particulate contaminants from mixing into the filled medicines or food, and greatly improves the purity and hygiene safety of the product.

[0043] As the first embodiment of this utility model:

[0044] like Figure 1 As shown, the multi-lobed guide structure 2 is located at the end of the filling metering sealing section 13.

[0045] In this embodiment, the plunger rod is used in a one-way valve plunger pump. The specific shape of the plunger rod is as follows: Figure 1 As shown, the guide section 21 of the multi-lobed guide structure 2 is set at the end of the filling metering sealing section 13. The guide section 21 is integrally formed with the filling metering sealing section 13. The diameter of the guide section 21 is only slightly smaller than the diameter of the filling metering sealing section 13, usually 0.02-0.10 mm smaller. The length and shape of the slot 22 can be adjusted according to the guide section 21.

[0046] As a second embodiment of this utility model:

[0047] like Figure 4 As shown, the side wall of the connecting section 11 extends outward to form a sealing section 111, the multi-lobed guide structure 2 is disposed between the sealing section 111 and the air-proof section 12, and a slotted valve 131 is provided on the outer side wall of the filling metering sealing section 13.

[0048] In this embodiment, the plunger rod is used in a grooved valve type plunger pump. The specific shape of the plunger rod is as follows: Figure 4 As shown, the multi-lobed guide structure 2 is disposed between the sealing section 111 and the clearance section 12. The outer diameter of the multi-lobed guide structure 2 is larger than the diameter of the clearance section 12, smaller than the diameter of the sealing section 111, and 0.1-0.3 mm smaller than the diameter of the filling and metering sealing section 13. The diameter of the sealing section 111 is 5-8 mm larger than the diameter of the filling and metering sealing section 13.

[0049] As a third embodiment of this utility model:

[0050] like Figure 6 As shown, the end of the filling and metering sealing section 13 is integrally formed with a pump plug section 132, and the diameter of the pump plug section 132 is larger than the diameter of the filling and metering sealing section 13.

[0051] In this embodiment, the plunger rod is used in a two-step plunger pump. The specific shape of the plunger rod is as follows: Figure 6 As shown, the plunger rod structure in this embodiment is similar to that in the second embodiment, except that a pump plug section 132 is added to the end of the filling and metering sealing section 13. The pump plug section 132 functions to cooperate with the inner wall of the pump sleeve during filling operations, forming a variable-volume cavity between the pump plug section 132, the groove valve 131, and the inner wall of the pump sleeve. The product of the difference in tangential area between the pump plug section 132 and the filling and metering sealing section 13 and the stroke is the filling volume.

[0052] like Figure 2 , Figure 3 As shown, a one-way valve plunger pump includes a plunger rod with a guide structure and a one-way valve plunger pump sleeve body 3. The plunger rod with the guide structure is slidably connected inside the one-way valve plunger pump sleeve body 3.

[0053] This embodiment illustrates the application of the plunger rod in a one-way valve plunger pump according to the first embodiment. The structure of the pump sleeve body 3 of the one-way valve plunger pump is prior art well known to those skilled in the art.

[0054] Figure 2 The diagram illustrates the relative positional relationship between the plunger rod and the pump sleeve body 3 of the one-way valve plunger pump during CIP / SIP functionality. The pump sleeve body 3 of the one-way valve plunger pump has a first-level step and a second-level step formed sequentially from top to bottom. The diameter of the second-level step is larger than that of the first-level step. During CIP / SIP functionality, the filling and metering sealing section 13 on the plunger rod is positioned on the second-level step and is not in contact with it. The multi-lobed guide structure 2 is positioned at the oblique transition between the first-level and second-level steps.

[0055] like Figure 3 As shown, because the outer diameter of the multi-lobed guide structure 2 is slightly smaller than the inner diameter of the first-stage step (usually 0.02-0.10 mm smaller), the plunger rod is in a semi-floating state within the pump sleeve body 3 of the one-way valve plunger pump. The gap between them can be filled with cleaning water and sterilizing steam to ensure that it plays a guiding role when pulled upwards. During the filling function, the multi-lobed guide structure 2 is not activated.

[0056] like Figure 5 As shown, a grooved valve type plunger pump includes a plunger rod with a guide structure, and also includes a grooved valve type plunger pump sleeve body 4 and a plunger pump plug 5. The plunger rod with the guide structure is slidably connected to one end of the grooved valve type plunger pump sleeve body 4, and the plunger pump plug 5 is slidably connected to the other end of the grooved valve type plunger pump sleeve body 4.

[0057] This embodiment illustrates the application of the plunger rod in a grooved valve plunger pump according to the second embodiment. The structures of the pump sleeve body 4 and the plunger plug 5 of the grooved valve plunger pump are existing technologies well-known to those skilled in the art.

[0058] Figure 5 This demonstrates the relative position of the plunger rod and the pump sleeve body 4 of the grooved valve plunger pump during CIP / SIP functionality. The pump sleeve body 4 internally comprises a first-stage, second-stage, and third-stage stepped structure from top to bottom. The diameter of the first-stage step is approximately 6 mm larger than the diameter of the second-stage step below, and the diameter of the third-stage step is 0.5-2 mm larger than the diameter of the second-stage step above. Because the outer diameter of the multi-lobed guide structure 2 is slightly smaller than the inner diameter of the second-stage step (typically 0.02-0.10 mm smaller), the plunger rod is in a semi-floating state within the pump sleeve body 4. The gap between them allows for the passage of cleaning water and sterilizing steam, ensuring a guiding effect during upward pulling. During the filling function, the multi-lobed guide structure 2 is inactive.

[0059] like Figure 7As shown, a double-step piston pump includes a piston rod with a guide structure and a double-step piston pump sleeve body 6, wherein the piston rod with the guide structure is slidably connected inside the double-step piston pump sleeve body 6.

[0060] This embodiment illustrates the application of the plunger rod in a two-step plunger pump according to the third embodiment. The structure of the pump sleeve body 6 of the two-step plunger pump is prior art well known to those skilled in the art.

[0061] Figure 7 This demonstrates the relative position of the plunger rod and the pump sleeve body 6 of the double-step plunger pump during CIP / SIP operation. The pump sleeve body 6 internally comprises four steps from top to bottom: a first-stage step, a second-stage step, a third-stage step, and a fourth-stage step. The diameter of the first-stage step is approximately 6 mm larger than the diameter of the second-stage step below it; the diameter of the third-stage step is 0.5-2 mm larger than the diameter of the second-stage step above it; and the diameter of the fourth-stage step is approximately 0.5-2 mm larger than the diameter of the pump plug section 132. During CIP / SIP operation, the pump plug section 132 on the plunger rod is positioned at the fourth-stage step and is not in contact with it. Because the outer diameter of the multi-lobed guide structure 2 is slightly smaller than the inner diameter of the second-stage step (typically 0.02-0.10 mm smaller), the plunger rod is in a semi-floating state within the pump sleeve body 6. The gap between them can be filled with cleaning water and sterilizing steam to ensure a guiding effect when pulled upwards. The multi-lobed guide structure 2 does not function during the filling process.

[0062] 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 rod with a guiding structure, characterized in that, include: The main body of the stopper rod (1) is a multi-segment cylindrical structure; A multi-lobed guide structure (2) is disposed on the outer side wall of the piston rod body (1); The multi-lobed guide structure (2) includes a guide section (21) and several slots (22) with arc transitions opened along the axial direction of the guide section (21).

2. The plunger rod with a guide structure as described in claim 1, characterized in that, The piston rod body (1) includes: Connecting section (11) is used to connect to an external drive mechanism; The clearance section (12) is a cylindrical structure, with one end connected to the connecting section (11); The filling metering sealing section (13) is connected to the other end of the air-proof section (12).

3. The plunger rod with a guide structure as described in claim 2, characterized in that, The multi-lobed guide structure (2) is located at the end of the filling metering sealing section (13).

4. The plunger rod with a guide structure as described in claim 2, characterized in that, The sidewall of the connecting section (11) extends outward to form a sealing section (111), the multi-lobed guide structure (2) is disposed between the sealing section (111) and the air-proof section (12), and a slotted valve (131) is provided on the outer sidewall of the filling metering sealing section (13).

5. The plunger rod with a guide structure as described in claim 4, characterized in that, The end of the filling and metering sealing section (13) is integrally formed with a pump plug section (132), the diameter of which is larger than the diameter of the filling and metering sealing section (13).

6. The plunger rod with a guide structure as described in claim 1, characterized in that, The number of slots (22) in the multi-lobed guide structure (2) is at least 4.

7. A one-way valve type plunger pump, characterized in that, The pump includes a plunger rod with a guide structure as described in any one of claims 1-3, and further includes a one-way valve type plunger pump sleeve body (3), wherein the plunger rod with the guide structure is slidably connected inside the one-way valve type plunger pump sleeve body (3).

8. A grooved valve type plunger pump, characterized in that, The plunger rod with a guide structure as described in any one of claims 1, 2, and 4 further includes: a grooved valve type plunger pump sleeve body (4) and a plunger pump plug (5), wherein the plunger rod with the guide structure is slidably connected to one end of the grooved valve type plunger pump sleeve body (4), and the plunger pump plug (5) is slidably connected to the other end of the grooved valve type plunger pump sleeve body (4).

9. A two-step plunger pump, characterized in that, The pump includes the plunger rod with a guide structure as described in claim 5, and further includes a double-step plunger pump sleeve body (6), wherein the plunger rod with the guide structure is slidably connected inside the double-step plunger pump sleeve body (6).

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