A pre-feeding mechanism and a bottle sheet conveying pump comprising the same

Abstract

The application discloses a pre-feeding mechanism and a bottle piece conveying pump containing the same, and belongs to the technical field of conveying pumps. The pre-feeding mechanism comprises a pump shell, a rotating shaft rotatably connected to the pump shell through a bearing and an impeller fixed to the end of the rotating shaft, and a sealing structure is arranged between the rotating shaft and the pump shell. The sealing structure comprises a sealing element sleeved on the outer wall of the rotating shaft. The application aims at solving the problems of pressure attenuation after abrasion, lack of multidirectional movement constraint and spring fatigue at high speed of the sealing structure adopting a linear spring in the prior art. The technical effect is that a unique spiral rib elastic element is adopted to replace a traditional spring, the component provides a nonlinear axial thrust, can self-adaptively maintain or even increase the sealing specific pressure during the abrasion of a sealing surface, ensures long-term and reliable sealing, and has a high-efficiency torque transmission function through integrated design, so that the structure is simplified and the overall rigidity and operation stability are improved.

Description

Technical Field

[0001] This invention relates to the field of delivery pump technology, and more specifically to a pre-feeding mechanism and a bottle flake delivery pump containing the mechanism. Background Technology

[0002] In various pumping equipment, especially pre-feed pumps in the chemical, pharmaceutical, and food industries, the reliability of the dynamic seal at the point where the shaft penetrates the pump casing is crucial for the long-term stable operation of the equipment and for preventing media leakage and environmental pollution. This part needs to seal the annular gap between the high-speed rotating shaft and the stationary pump casing. The working environment is often accompanied by the pressure and corrosiveness of the medium, as well as the radial runout and axial movement of the shaft due to load changes.

[0003] While traditional mechanical seals or packing seals are widely used, they often suffer from problems such as cumbersome adjustments, sensitivity to shaft runout, and insufficient compensation for wear when facing the complex operating conditions described above. Some improved solutions use elastic elements (such as springs) to provide initial specific pressure to the sealing end face and compensate for wear through elastic deformation. However, the output force of commonly used helical compression springs is linearly related to the compression amount. As the sealing end face gradually wears down due to normal wear, the spring elongates, and the sealing pressure it provides decreases linearly, leading to a decline in sealing performance in the later stages of its lifespan and posing a risk of sudden leakage. In addition, a single axial spring can only provide thrust and lacks constraint and stabilization of the sealing assembly in the radial and angular degrees of freedom. Under high-speed or vibration conditions, the sealing pair is prone to uneven wear, affecting its lifespan and sealing effect. For high-speed rotational conditions, the spring rotating with the shaft is prone to fatigue due to periodic torsion, affecting the stability of the thrust output.

[0004] Therefore, to address the inadequacy of existing requirements, we propose a pre-feeding mechanism and a bottle flake conveying pump incorporating this mechanism. Summary of the Invention

[0005] To address these issues, the present invention provides a pre-feeding mechanism and a bottle flake conveying pump incorporating the mechanism, thereby resolving the aforementioned problems in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] According to a first aspect of the present invention, a pre-feeding mechanism includes a pump housing, a rotating shaft rotatably connected to the pump housing via a bearing, and an impeller fixed to the end of the rotating shaft, wherein a sealing structure is provided between the rotating shaft and the pump housing;

[0008] The sealing structure includes:

[0009] A sealing element fitted on the outer wall of a rotating shaft includes an annular rubber ring one, an annular rubber ring two, and an elastic rubber ring installed between the two, which can rotate with the rotating shaft. The inner side of the annular rubber ring two is provided with an annular groove.

[0010] An annular fixing block is fixed on the pump casing, the outer wall of which slides with the inner wall of the annular groove, and a connecting block is provided between the end faces of the two.

[0011] The clamping assembly located between the first and second annular rubber rings includes a first and a second abutment plate that are radially limited and axially slidably connected to the first and second annular rubber rings, respectively, and an elastic force-applying unit connected between the first and second abutment plates. The elastic force-applying unit is used to apply an axial thrust to the first and second abutment plates to move them away from each other, thereby pressing the second annular rubber ring against the end face of the annular fixing block through the connecting abutment block.

[0012] Furthermore, the elastic force-applying unit is a thrust spring, with its two ends connected to the first abutment plate and the second abutment plate, respectively.

[0013] Furthermore, the inner sides of both ends of the thrust spring are fixedly connected to the outer walls of the first and second abutment plates, respectively.

[0014] Furthermore, annular plates are fixedly connected to the inner sides of both ends of the thrust spring, and the inner sides of the annular plates are rotatably connected to the outer walls of the first and second abutment plates via bearings.

[0015] Furthermore, the elastic force-applying unit is a spiral rib elastic element, which is integrally formed and connected between the first abutment and the second abutment.

[0016] Furthermore, the spiral rib elastic member comprises at least two sets of spiral ribs with opposite spiral directions, and the two ends of the spiral rib elastic member are a first connecting part and a second connecting part, respectively; the first connecting part is connected to the first abutment plate, and the second connecting part is connected to the second abutment plate.

[0017] Furthermore, the spiral rib elastic element is pre-compressed between the first and second abutment plates, and its spiral ribs generate composite elastic deformation. The stored deformation energy generates an axial preload force that causes the two abutment plates to move away from each other.

[0018] Furthermore, an annular retaining ring is fixed to the inner side of the annular rubber ring, and an annular groove that mates with the annular retaining ring is provided on the outer wall of the rotating shaft.

[0019] Furthermore, both the first and second abutments include an annular plate and an annular sleeve connected to one end thereto. The end of the annular sleeve away from the annular plate has an inwardly turned flange, which is held on the outer edge of the first or second annular rubber ring.

[0020] Furthermore, an annular groove is provided on the pump casing, and the annular fixing block is disposed in the annular groove through an annular sealing block, with a sealing gasket provided between the annular sealing block and the annular groove.

[0021] Furthermore, the annular fixing block is fixedly connected to the end of the annular sealing block away from the sealing gasket.

[0022] The present invention has the following advantages:

[0023] 1. This pre-feeding mechanism brings several significant improvements by replacing the traditional linear thrust spring with a unique helical rib elastic element. The helical rib elastic element is composed of a mirror-symmetrical array of helical ribs. Its three-dimensional curved surface structure generates complex bending and torsional deformation under axial compression, making its force-displacement relationship exhibit ideal nonlinear characteristics. This characteristic enables the device to automatically provide a stable and then increasing sealing pressure during the compensation process of wear on the sealing end face, effectively counteracting the pressure attenuation trend caused by the increase of wear gap, realizing the adaptive maintenance of sealing specific pressure, greatly extending the effective life of the seal and improving the reliability at the end, and solving the fundamental defects of the linear spring solution.

[0024] 2. This pre-feeding mechanism features a ring-shaped array of spiral ribs forming a circumferentially uniform and symmetrical elastic support network. This structure not only transmits axial thrust, but its unique spatial geometry also generates a sensitive elastic restoring torque to the radial displacement, angular sway, and circumferential misalignment of the connecting components. This is equivalent to integrating an omnidirectional elastic stabilization and guiding system within the sealing assembly. It can effectively absorb and isolate vibrations and jumps from the rotating shaft, ensuring that the rotating sealing end face and the stationary end face always maintain a uniform and stable fit. This significantly improves the operational stability and durability of the sealing pair under dynamic conditions and avoids uneven wear caused by uneven force.

[0025] 3. This pre-feeding mechanism, in which the helical rib elastic element is a one-piece rigid connector, exhibits extremely high efficiency in transmitting circumferential torque due to its helical rib structure. It ensures synchronous rotation without relative lag between the rotating parts inside the seal, completely eliminating additional friction and wear caused by asynchronous internal movement. Simultaneously, this integrated design merges the functions of multiple separate components (spring, guide rod, connector) in traditional solutions into a single part, significantly simplifying the structure of the sealing assembly, reducing assembly steps, and improving the overall compactness, rigidity, and operational reliability. It embodies a high degree of unity between structural design and functional implementation. Attached Figure Description

[0026] Figure 1 This is a front view of a pre-feeding mechanism proposed in this invention;

[0027] Figure 2 for Figure 1 A schematic diagram of the decomposition process;

[0028] Figure 3 for Figure 1 Internal view diagram;

[0029] Figure 4 for Figure 1 A front sectional view;

[0030] Figure 5 This is an enlarged schematic diagram of the sealing area;

[0031] Figure 6 This is the main view of the rotating shaft;

[0032] Figure 7 This is the front view of the seal;

[0033] Figure 8 This is a sectional front view of the seal.

[0034] Figure 9 This is a cross-sectional view of a thrust spring;

[0035] Figure 10 This is an exploded view of the helical rib elastic element.

[0036] In the diagram: 1. Pump casing; 101. Bearing bracket; 102. Intermediate bracket; 103. Pump body; 2. Rotating shaft; 3. Bearing; 4. Impeller; 5. Sealing structure; 51. Sealing element; 511. Annular rubber ring one; 512. Annular rubber ring two; 513. Elastic rubber ring; 514. Annular groove; 52. Clamping assembly; 521. Thrust spring; 522. Clamping plate one; 523. Clamping plate two; 5251. Annular plate; 5252. Annular sleeve; 5253. Hanging flange; 526. Spiral rib elastic element; 5261. Spiral rib one; 5262. Spiral rib two; 53. Annular groove; 54. Sealing gasket; 55. Annular sealing block; 56. Annular fixing block; 57. Connecting block; Detailed Implementation

[0037] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Example 1;

[0039] Reference Figures 1-9 A pre-feeding mechanism includes a pump housing 1 composed of a bearing bracket 101, an intermediate bracket 102 and a pump body 103. The inner side of the bearing bracket 101 is rotatably connected to a rotating shaft 2 via a bearing 3. A through groove is provided in the middle of the intermediate bracket 102.

[0040] The output end of the rotating shaft 2 extends through the bearing bracket and the through groove of the intermediate bracket 102 to the pump body 103 and is fixedly connected to the impeller 4.

[0041] To ensure the pump body is sealed and prevent media leakage, a sealing structure 5 is provided between the inner side of the rotating shaft 2 and the bearing bracket 101 near the intermediate bracket 102, and between the inner wall of the through groove of the rotating shaft 2 and the intermediate bracket 102.

[0042] The sealing structure includes:

[0043] Two sets of annular grooves 53 are respectively opened on the end face of the bearing bracket 101 and the end of the through groove of the intermediate bracket 102 near the pump body 103; an annular sealing abutment is fixedly installed in each annular groove 53; the annular sealing abutment is composed of an annular sealing block 55, and an annular sealing gasket 54 is provided between the annular sealing block 55 and the annular groove 53 for static sealing; an annular fixing block 56 is fixedly connected to the end of the annular sealing block 55 away from the sealing gasket 54.

[0044] The sealing structure also includes a sealing element 51 sleeved on the outer wall of the rotating shaft 2; the sealing element 51 is composed of an annular rubber ring 511, an annular rubber ring 512, and an elastic rubber ring 513 connecting the two; one end of the elastic rubber ring 513 is fixedly connected to the outer wall of the annular rubber ring 511, and the other end is fixedly connected to the annular rubber ring 512; the elastic rubber ring 513 allows the annular rubber ring 512 to float axially within a certain range and adapt to the deflection.

[0045] The inner side of the annular rubber ring 512 is provided with an annular groove 514, and the inner wall of the annular groove 514 slides with the outer wall of the annular fixing block 56. In order to achieve reliable contact and compensate for installation gap, a connecting block 57 is provided between the end face of the annular fixing block 56 away from the annular sealing block 55 and the inner wall of the annular groove 514.

[0046] To further improve the sealing and fitting pressure and followability, a clamping component 52 is provided between the annular rubber ring 511 and the annular rubber ring 512 of the sealing element 51.

[0047] The clamping assembly 52 includes a first abutment plate 522 slidably sleeved on the outer wall of the first annular rubber ring 511, a second abutment plate 523 slidably sleeved on the outer wall of the second annular rubber ring 512, and a thrust spring 521 connected between the two; as Figure 9As shown, the first abutment plate 522 and the second abutment plate 523 have the same structure, both including an annular plate 5251. One end of the annular plate 5251 is connected to an annular sleeve 5252. The end of the annular sleeve 5252 away from the annular plate 5251 forms an inwardly flanged annular hanging edge 5253, and the inner diameter of the hanging edge 5253 is smaller than the inner diameter of the annular sleeve 5252. Through this hanging edge structure, the first abutment plate 522 and the second abutment plate 523 can be respectively held on the corresponding outer edges of the annular rubber ring 511 and the annular rubber ring 512, achieving radial limiting while allowing axial sliding. The inner sides of both ends of the thrust spring 521 are fixedly connected to the outer walls of the first abutment plate 522 and the second abutment plate 523, thereby continuously applying axial thrust to both sides, forcing the second annular rubber ring 512 to be tightly pressed against the annular fixing block 56 through the connecting abutment block 57, while keeping the first annular rubber ring 511 axially positioned.

[0048] An annular retaining ring is fixedly installed on the inner side of the annular rubber ring 511, and an annular groove is correspondingly opened on the outer wall of the rotating shaft 2. The annular retaining ring is embedded in the annular groove. This matching method allows the sealing element 51 to be fixed relative to the rotating shaft 2 in the radial direction and to rotate together with the rotating shaft. At the same time, it allows the sealing element 51 to have a small displacement space in the axial direction to adapt to the thrust adjustment of the clamping component 52.

[0049] Working principle: When the shaft 2 rotates, the seal 51 rotates synchronously with the shaft 2 through the inner annular retaining ring; the thrust spring 521 in the clamping assembly 52 continuously pushes the first abutment plate 522 and the second abutment plate 523, thereby transmitting the axial thrust to the second annular rubber ring 512, so that it always presses tightly against the end face of the annular fixed block 56 through the connecting abutment block 57, forming a dynamic sealing interface; the elastic rubber ring 513 can not only transmit the thrust, but also absorb the slight radial runout and wobble generated during the operation of the shaft, ensuring that the second annular rubber ring 512 and the annular fixed block 56 are always uniformly and reliably fitted; the static seal between the annular sealing abutment block 55 and the pump casing is completed by the sealing gasket 54; this structure realizes effective sealing between rotating parts and stationary parts, and has good wear compensation and working condition adaptability;

[0050] Example 2:

[0051] The core improvement is that the power transmission path of the clamping component 52 is optimized to eliminate the torsional stress of the spring during high-speed rotation. The specific difference is that the inner sides of both ends of the thrust spring 521 are fixedly connected to annular plates. The inner sides of the annular plates connected to both ends of the thrust spring 521 are rotatably connected to the outer walls of the first abutment plate 522 and the second abutment plate 523 through bearings, respectively.

[0052] Working principle: When the rotating shaft 2 rotates at high speed, the seal 51 drives the connected abutment plate 522 and abutment plate 523 to rotate synchronously. At this time, since the two ends of the thrust spring 521 are connected to the two abutment plates through bearings, the spring itself no longer rotates with the rotating shaft, but only serves as a stationary element that provides axial thrust. This design completely eliminates the alternating torque generated when the spring rotates with the shaft in Embodiment 1, avoids fatigue failure of the spring due to cyclic torsion, and ensures the long-term stability and consistency of thrust output. The bearing connection decouples the rotational motion from the axial elastic force, making this structure particularly suitable for high-speed, long-cycle continuous operation conditions. While maintaining excellent sealing and following performance, it further improves the reliability and service life of the mechanism.

[0053] Example 3:

[0054] Basically the same as Example 1, see details below. Figure 10 The difference lies in the removal of the thrust spring 521. The technical problem with Embodiment 1 is that the spiral compression thrust spring used as a single elastic source provides a linear relationship between the axial thrust and the compression amount. When the sealing end face wears and the spring elongates to compensate for the gap, its output thrust decreases linearly, leading to a decrease in the sealing specific pressure and a risk of later sealing failure. Furthermore, the spring only provides axial force and lacks radial or circumferential constraint and guiding functions, requiring improvement in the motion stability of the sealing assembly under complex working conditions. To further address these issues, a further improvement is made by adding a thrust plate 522 between the first and second thrust plates 523. A spiral rib elastic element 526 is provided between the abutment plate 1 522 and the abutment plate 2 523. The spiral rib elastic element 526 is composed of two sets of spiral ribs arranged in opposite spiral directions / mirror-symmetric arrangement, and is evenly distributed in a ring array between the abutment plate 1 522 and the abutment plate 2 523. Each set of spiral ribs has a three-dimensional spatial curved surface shape, with a smooth transition between its root and the connecting part. Its main body extends along the circumferential direction while having continuous axial undulation and circumferential torsion. The ends of all the ribs converge and support the connecting part on the other side, forming a whole. The two sets of spiral ribs are: Spiral Rib 1 5261 and Spiral Rib 2 5262.

[0055] Working principle: During installation, the spiral rib elastic element 526 is pre-compressed between the first abutment plate 522 and the second abutment plate 523. Its spiral ribs 5263 undergo compound elastic deformation (including bending and torsion), thereby storing deformation energy and generating an initial axial pre-tightening force that pushes the two abutment plates apart. This force is transmitted through the second abutment plate 523, causing the second annular rubber ring 512 to press tightly against the cover and establish an initial seal.

[0056] During runtime, this flex element performs its integrated functions:

[0057] Provides nonlinear axial thrust and wear compensation: When the sealing surface wears and the abutment plate 523 moves axially under the pressure of the medium, the spiral rib 5263 is further stretched or compressed; due to its unique spatial spiral geometry, its force-displacement characteristics exhibit significant nonlinearity; within the designed compensation stroke, the axial restoring force it generates can first remain stable with the amount of deformation and then increase significantly, thereby effectively offsetting or even reversing the trend of decreasing sealing pressure caused by wear, and achieving adaptive sealing pressure maintenance;

[0058] Achieving multi-dimensional guidance and motion stability: The spiral rib array is evenly distributed circumferentially, forming multi-point, symmetrical elastic constraints on the connecting parts on both sides; this structure can not only transmit axial force, but its spatial geometry also enables it to generate elastic restoring torque on the radial displacement, angular sway, and circumferential misalignment of the connecting parts (and the abutment and seal fixed thereto); this is equivalent to building an omnidirectional elastic guidance and stabilization system into the sealing assembly, which can effectively suppress the vibration and jump of the rotating shaft transmitted to the sealing end face, ensure uniform and stable sealing of the sealing pair, and greatly improve the reliability of dynamic sealing;

[0059] Efficient transmission of rotational torque: The integrated spiral rib serves as a rigid connecting element, which can efficiently transmit circumferential rotational torque between the first abutment plate 522 and the second abutment plate 523, ensuring that the first annular rubber ring 511 and the second annular rubber ring 512 rotate synchronously with the shaft, eliminating abnormal wear caused by asynchrony inside the sealing assembly.

Claims

1. A pre-feeding mechanism, characterized in that, It includes a pump housing (1), a rotating shaft (2) rotatably connected to the pump housing (1) via a bearing (3), and an impeller (4) fixed to the end of the rotating shaft (2). A sealing structure (5) is provided between the rotating shaft (2) and the pump housing (1). The sealing structure (5) includes: The sealing element (51) sleeved on the outer wall of the rotating shaft (2) includes an annular rubber ring one (511), an annular rubber ring two (512) that can rotate with the rotating shaft (2) and an elastic rubber ring (513) installed between the two. The inner side of the annular rubber ring two (512) is provided with an annular groove (514). An annular fixing block (56) is fixed on the pump casing (1), and its outer wall is slidably engaged with the inner wall of the annular abutment groove (514). A connecting abutment block (57) is provided between the end faces of the two. An abutment assembly (52) is provided between the first annular rubber ring (511) and the second annular rubber ring (512). It includes a first abutment plate (522) and a second abutment plate (523) that are radially limited and axially slidably connected to the first annular rubber ring (511) and the second annular rubber ring (512), respectively, and an elastic force-applying unit connected between the first abutment plate (522) and the second abutment plate (523). The elastic force-applying unit is used to apply an axial thrust to the first abutment plate (522) and the second abutment plate (523) to move them away from each other, so that the second annular rubber ring (512) is pressed against the end face of the annular fixing block (56) through the connecting abutment block (57). The elastic force application unit is a spiral rib elastic element (526), ​​which is integrally formed and connected between the first abutment plate (522) and the second abutment plate (523); The spiral rib elastic element (526) is composed of at least two sets of spiral ribs with opposite spiral directions. The two ends of the spiral rib elastic element (526) are a first connecting part and a second connecting part, respectively. The first connecting part is connected to the first abutment plate (522), and the second connecting part is connected to the second abutment plate (523).

2. The pre-feeding mechanism according to claim 1, characterized in that, The spiral rib elastic element (526) is pre-compressed between the first abutment plate (522) and the second abutment plate (523), and its spiral ribs generate composite elastic deformation. The stored deformation energy generates an axial preload force that causes the two abutment plates to move away from each other.

3. The pre-feeding mechanism according to claim 1, characterized in that, An annular retaining ring is fixed to the inner side of the annular rubber ring (511), and an annular groove that mates with the annular retaining ring is provided on the outer wall of the rotating shaft (2).

4. A pre-feeding mechanism according to claim 1, characterized in that, Both the first abutment (522) and the second abutment (523) include an annular plate (5251) and an annular sleeve (5252) connected to one end thereto. The annular sleeve (5252) has an inwardly turned-up hanging edge (5253) at the end away from the annular plate (5251). The hanging edge (5253) is held on the outer edge of the first annular rubber ring (511) or the second annular rubber ring (512).

5. A pre-feeding mechanism according to claim 4, characterized in that, The pump casing (1) is provided with an annular groove (53), and the annular fixing block (56) is provided in the annular groove (53) through an annular sealing block (55). A sealing gasket (54) is provided between the annular sealing block (55) and the annular groove (53).

6. A pre-feeding mechanism according to claim 5, characterized in that, The annular fixing block (56) is fixedly connected to the end of the annular sealing block (55) away from the sealing gasket (54).

7. A bottle flake conveying pump containing a pre-feeding mechanism, characterized in that, Includes a pre-feeding mechanism as described in any one of claims 1-6.

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