A cavitation-resistant gear pump

Abstract

This invention relates to the field of water pump technology and discloses an anti-cavitation gear pump, comprising a motor body; a protective shell is fitted onto the outer wall of the motor body; a gear pump component is disposed on the protective shell; the output shaft of the motor body and the gear pump component are drivenly connected; and a buffer pumping assembly is fixedly mounted on the outer wall of the protective shell. The use of spiral support ribs as a connection and support between the motor body and the shell enhances the rigidity of the overall structure. Simultaneously, the shell physically encloses the motor body, preventing direct collisions under complex operating conditions such as underground operations. The spiral shape of the support ribs naturally forms a spiral liquid flow channel between the inner wall of the shell and the outer wall of the motor body. A portion of the pumped liquid enters this channel and, guided by the spiral path, flows along the outer wall of the motor body, thereby efficiently absorbing the heat generated by the motor operation and achieving excellent heat dissipation.

Description

Technical Field

[0001] This invention relates to the field of water pump technology, specifically to a gear pump resistant to cavitation. Background Technology

[0002] Water pumps, as key equipment in fluid transport machinery, are widely used in many fields such as industrial production, agricultural irrigation, municipal water supply, and daily life. With the development of technology, the requirements for water pumps' operational stability, service life, ease of maintenance, and multi-functional integration are also increasing.

[0003] However, existing water pump products still have the following shortcomings in practical applications:

[0004] Traditional water pumps, especially high-power centrifugal pumps, generate severe vibrations and significant noise when operating at high speeds due to factors such as motor rotor imbalance, pressure pulsation of the fluid within the pump chamber, and cavitation. To suppress vibration, conventional solutions typically involve installing an external vibration-damping base, rubber vibration isolation pads, or spring dampers on the outside of the pump. This "external" vibration reduction method not only increases the overall size and weight of the equipment, raising installation complexity and cost, but also has limited vibration reduction effect, making it difficult to fundamentally solve the long-term damage caused by vibration to the pump body and pipeline system.

[0005] As the power core of the water pump, the motor generates a lot of heat during long-term operation. Traditional heat dissipation methods mostly rely on the heat dissipation fins on the motor casing for natural water cooling in the water.

[0006] The stability of the flow field at the pump inlet is crucial to the overall pump performance. Vibration of the equipment itself may induce tiny cavitation or cause local pressure fluctuations in the liquid in the inlet area. This unstable flow field will affect the impeller filling degree, leading to fluctuations in the output flow rate. In severe cases, it may even cause cavitation, resulting in irreversible damage to the impeller.

[0007] In summary, existing water pump technologies often employ independent solutions for vibration reduction, heat dissipation, and operational stability, lacking an integrated design that can systematically and comprehensively address these multiple issues.

[0008] Therefore, developing a new type of water pump with a compact structure and functions such as efficient vibration reduction, active heat dissipation, and stable flow field is of great practical significance and has broad market prospects. Summary of the Invention

[0009] This invention provides a cavitation-resistant gear pump, which solves the problems mentioned in the background art.

[0010] This invention provides the following technical solution: a cavitation-resistant gear pump, comprising a motor body:

[0011] The outer wall of the motor body is fitted with a protective shell;

[0012] The protective housing is equipped with a gear pump component.

[0013] The output shaft of the motor body is driven to connect with the gear pump component;

[0014] The outer wall of the protective shell is fixedly fitted with a buffer pump assembly.

[0015] As a preferred embodiment of the present invention: the gear pump component includes a pump housing, one end of the pump housing is connected to a liquid outlet, the other end of the pump housing is connected to a liquid inlet, and the inner wall of the pump housing is rotatably connected to a driving gear and a driven gear respectively.

[0016] As a preferred embodiment of the present invention: the protective housing includes a shell, and the outer wall of the shell near the gear pump component has a receiving cavity.

[0017] As a preferred embodiment of the present invention: a spiral support rib is fixedly assembled on the inner wall of the housing, and the spiral support rib is in contact with the outer wall of the motor body to form a spiral liquid flow channel between the housing and the motor body.

[0018] As a preferred technical solution of the present invention, the spiral support rib is made of foam metal material or polymer composite material.

[0019] As a preferred technical solution of the present invention: the outer wall of the motor body and the outer wall of the spiral support rib are fitted together, and the spiral support ribs are arranged in a spiral shape. The gear pump component is located between the sealed end side of the protective shell and the motor body. The outer sides of the gear pump component are fitted with the inner wall of the protective shell, and the outer edge of the isolation flange located on the output shaft side of the motor body is fitted with the inner wall of the protective shell. The space near the bottom of the gear pump component is connected to the space between the protective shell and the motor body through the guide groove.

[0020] As a preferred embodiment of the present invention, the outer wall of the buffer pumping assembly near the protective housing is further provided with a buffer component for connecting to the protective housing.

[0021] As a preferred technical solution of the present invention: the buffer component includes two sets of elastic supports, and the inner walls of the two sets of elastic supports are fixedly fitted with elastic bladders. The two sets of elastic bladders are connected by a connecting pipe, and the end of the set of elastic bladders near the gear pump component is connected to an output pipe.

[0022] As a preferred embodiment of the present invention: the opposite ends of the two sets of elastic bladders are connected to one-way valves, the buffer pumping assembly is fixedly assembled through the elastic support and the outer wall of the protective shell, and the liquid flow space formed between the end of the output pipe and the bottom of the gear pump component and the protective shell is connected.

[0023] The present invention has the following beneficial effects:

[0024] 1. This anti-cavitation gear pump uses spiral support ribs as the connection and support between the motor body and the housing, which enhances the rigidity of the overall structure. At the same time, the housing physically encloses the motor body, avoiding direct collisions between the equipment and the motor body under complex working conditions such as underground operations. The spiral shape of the spiral support ribs naturally forms a spiral liquid flow channel between the inner wall of the housing and the outer wall of the motor body. Part of the pumped liquid enters this channel and flows along the outer wall of the motor body under the guidance of the spiral path, thereby efficiently absorbing the heat generated by the motor operation and achieving excellent heat dissipation.

[0025] The spiral support ribs and the buffer pumping components do not work in isolation, but form a virtuous cycle in function. First, the efficient heat dissipation brought by the spiral support ribs ensures that the motor operates within the optimal temperature range, achieving two positive effects: one is that the motor output power and speed are more stable, reducing the flow and pressure pulsation of the pump from the source; the other is that it reduces the wear of mechanical parts caused by overheating, thereby weakening the intensity of the vibration source of the equipment itself.

[0026] Based on this, the buffer pumping assembly faces a vibration that has already been 'pre-treated' and has a lower intensity, making its passive vibration reduction effect better. At the same time, its function of using vibration energy for auxiliary pumping is also more efficient and controllable. By converting the weakened vibration 'waste energy' into the fluid kinetic energy replenished to the pump inlet, it precisely suppresses cavitation that may be caused by small pressure fluctuations. By combining 'source suppression (stabilizing the motor)' and 'end elimination (inlet liquid replenishment)', it jointly achieves anti-cavitation performance.

[0027] 2. When the motor body of this anti-cavitation gear pump is running, vibration will inevitably occur. This vibration will be transmitted to the protective shell, which will cause the elastic support and the internal elastic bladder to undergo periodic compression and rebound deformation.

[0028] The deformation process of the elastic support and elastic bladder itself absorbs and dissipates a large amount of vibration energy, playing a highly efficient passive vibration reduction role.

[0029] When the elastic bladder is compressed, the liquid or air inside it will be discharged through the one-way valve at one end; when it returns to its shape, a negative pressure is formed inside, which will draw liquid from the outside through the one-way valve at the other end. Through repeated compression-rebound cycles, the elastic bladder constitutes a micro pump driven by vibration.

[0030] The output pipe continuously replenishes the main flow rate of the gear pump component with the sucked-in liquid, and can also effectively replenish the local low pressure area or small cavitation that may be generated at the inlet due to vibration. This ensures that the liquid sucked into the gear pump component is full, thereby ensuring the stability of the pumping flow rate and avoiding cavitation. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the complete structure of the present invention;

[0032] Figure 2 This is a schematic diagram of the spiral support rib structure of the present invention;

[0033] Figure 3 This is a schematic diagram of the flow guide groove structure of the present invention;

[0034] Figure 4 This is a schematic diagram of the protective outer shell structure of the present invention;

[0035] Figure 5 This is a schematic diagram of the gear pump component structure of the present invention;

[0036] Figure 6 This is a schematic diagram of the elastic capsule structure of the present invention;

[0037] Figure 7 This is a schematic diagram of the buffer pumping assembly structure of the present invention.

[0038] In the diagram: 1. Motor body; 2. Isolation flange; 3. Gear pump components; 4. Flow guide slot; 5. Protective housing; 6. Buffer pumping assembly;

[0039] 301. Pump casing; 302. Liquid outlet; 303. Liquid inlet; 304. Driving gear; 305. Driven gear;

[0040] 501. Shell; 502. Receiving cavity; 503. Helical support rib;

[0041] 601. Elastic bladder; 602. Connecting tube; 603. Elastic support; 604. Output tube. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0043] Please see Figure 1 - Figure 7 A cavitation-resistant gear pump includes a motor body 1, an isolation flange 2 fixedly mounted on the outer wall of the motor body 1 near the output end, a gear pump component 3 provided on the output shaft side of the motor body 1, a flow guide groove 4 opened on the bottom outer wall of the isolation flange 2, a protective shell 5 sleeved on the outer wall of the motor body 1, and a buffer pumping component 6 fixedly mounted on the outer wall of the protective shell 5.

[0044] In this embodiment, the motor body 1 serves as the power source. An isolation flange 2 is fixedly mounted on the outer wall of its output end using bolts or an integral molding method for connection to an external piping system. The output shaft of the motor body 1 is driven by the power input end of the gear pump component 3 via a keyed or splined connection.

[0045] To protect and dissipate heat from the motor body 1, a protective housing 5 is fitted onto its outer wall. A fluid channel is formed between the protective housing 5 and the motor body 1. A buffer pumping assembly 6 is further fixedly mounted on the outer wall of the protective housing 5 to absorb vibration and assist pumping.

[0046] The isolation flange 2 and gear pump component 3 are fixedly assembled on the outer wall.

[0047] In a preferred embodiment, the gear pump component 3 includes a pump housing 301, one end of which is connected to a liquid outlet 302, and the other end of which is connected to a liquid inlet 303. The inner wall of the pump housing 301 is rotatably connected to a driving gear 304 and a driven gear 305.

[0048] In a preferred embodiment, the protective housing 5 includes a housing 501, and the outer wall of the housing 501 near the gear pump component 3 has a receiving cavity 502.

[0049] The inner wall of the housing 501 is fixedly fitted with a spiral support rib 503, which fits against the outer wall of the motor body 1 to form a spiral liquid flow channel between the housing 501 and the motor body 1.

[0050] In a preferred embodiment: the outer wall of the motor body 1 and the outer wall of the spiral support rib 503 are attached together, and a plurality of spiral support ribs 503 are arranged in a spiral shape. The gear pump component 3 is located between the sealed end side of the protective housing 5 and the motor body 1. The outer sides of the gear pump component 3 are attached to the inner wall of the protective housing 5, and the outer edge of the isolation flange 2 located on the output shaft side of the motor body 1 is attached to the inner wall of the protective housing 5. The space near the bottom of the gear pump component 3 is connected to the space between the protective housing 5 and the motor body 1 through the guide slot 4.

[0051] In the above structure, the spiral support rib 503 serves as the connection between the motor body 1 and the housing 501, allowing the vibration generated during operation of the motor body 1 to be transmitted through the spiral support rib 503. The housing 501 covers the motor body 1, creating a liquid flow space between the housing 501 and the motor body 1. Simultaneously, the space near the bottom of the gear pump component 3 is connected to the space between the protective housing 5 and the motor body 1 through the guide slot 4. This allows external liquid to enter the inner cavity of the pump housing 301 through the liquid inlet 303 during operation of the gear pump component 3. By placing the liquid inlet 303 in the space near the bottom of the gear pump component 3, and this space being connected to the space between the protective housing 5 and the motor body 1 through the guide slot 4, the liquid between the protective housing 5 and the motor body 1 can be circulated.

[0052] The spiral support rib 503 is arranged in a spiral shape, so that the liquid between the housing 501 and the motor body 1 can flow through the guidance of the spiral support rib 503.

[0053] By having the liquid flow along the outer wall of the motor body 1, the efficiency of the liquid in absorbing the heat generated by the operation of the motor body 1 is further improved.

[0054] On the other hand, by covering the motor body 1 with the housing 501, the problem of the motor body 1 directly colliding with the construction environment can be prevented when the equipment is lowered into the construction environment.

[0055] Furthermore, the materials used to prepare the spiral support rib 503 are not limited to a single type.

[0056] In other alternative embodiments, the spiral support rib 503 is made of foamed metal material or polymer composite material.

[0057] In other alternative embodiments, the helical support rib 503 may also be made of a composite material with specific functions.

[0058] For example, when made of foam metal or polymer composite material with high damping properties, the spiral support rib 503 can not only provide support and flow guidance functions, but also absorb and dissipate some of the vibration energy transmitted from the motor body 1, thereby further enhancing the shock absorption effect of the whole machine.

[0059] In a preferred embodiment, the outer wall of the buffer pumping assembly 6 near the protective housing 5 is further provided with a buffer component for connection with the protective housing 5.

[0060] In a preferred embodiment, the buffer component includes two sets of elastic supports 603, and elastic bladders 601 are fixedly mounted on the inner walls of both sets of elastic supports 603. The two sets of elastic bladders 601 are connected by a connecting pipe 602, and the end of the set of elastic bladders 601 near the gear pump component 3 is connected to an output pipe 604.

[0061] In a preferred embodiment: the opposite ends of the two sets of elastic bladders 601 are connected to one-way valves, the buffer pumping assembly 6 is fixedly assembled through the elastic support 603 and the outer wall of the protective shell 5, and the end of the output pipe 604 is connected to the liquid flow space formed between the bottom of the gear pump component 3 and the protective shell 5.

[0062] In the above structure, the buffer pumping assembly 6 is fixedly assembled with the outer wall of the elastic support 603 and the protective shell 5, while the inner wall of the elastic support 603 and the elastic bladder 601 are fixedly assembled. When the motor body 1 drives the gear pump component 3 to run, its vibration will cause the elastic support 603 to deform. The elastic support 603 will cause the elastic bladder 601 to deform. At the same time, the one-way valve connected to the opposite end of the elastic bladder 601 allows the air or liquid in the inner cavity of the elastic bladder 601 to be discharged through the one-way valve on the side closer to the gear pump component 3 when the elastic bladder 601 is shrinking. When the elastic bladder 601 is restoring its shape, the negative pressure in the inner cavity of the elastic bladder 601 allows the external liquid to be drawn in through the one-way valve on the side away from the gear pump component 3.

[0063] By repeatedly contracting and recovering its shape, the elastic bladder 601 can absorb vibrations while also transmitting liquid.

[0064] When the motor body 1 drives the protective shell 5 to vibrate, the liquid at the liquid inlet 303 of the gear pump component 3 is affected by the vibration. There will be a certain amount of air between the equipment and the liquid. Several elastic bladders 601 and output pipes 604 will transfer the liquid to the liquid flow space formed between the bottom of the gear pump component 3 and the protective shell 5, thereby increasing the liquid content at that point and ensuring the increase in the liquid pumping flow rate achieved by the motor body 1 driving the gear pump component 3.

[0065] The elastic capsule 601 is preferably made of nitrile rubber or fluororubber with high elastic hysteresis characteristics. This type of material is not only oil-resistant and wear-resistant, but also dissipates some vibration energy through friction of its internal molecular chains under forced vibration. This energy is dissipated in the form of heat energy, thereby achieving passive damping and vibration reduction of high-frequency vibration.

[0066] Meanwhile, the elastic bladder 601 is designed as a corrugated tubular structure with multiple annular corrugations, which enables it to generate a large volume change under axial vibration. The one-way valves at both ends are preferably gravity-type or spring-loaded miniature reed valves. When the equipment vibrates and the elastic bladder 601 is compressed, its internal pressure rises instantaneously, overcoming the opening threshold of the outlet one-way valve and discharging the internal liquid (non-air) into the output pipe 604. When the vibration reverses and the elastic bladder 601 rebounds and expands, a negative pressure is formed inside. At this time, the outlet one-way valve closes and the inlet one-way valve is sucked open, drawing in liquid from the outside.

[0067] A portion of the vibration energy (mainly high-frequency, disordered impacts) is absorbed and dissipated by the damping properties of the material, thus achieving vibration reduction; while another portion of the energy (mainly low-frequency, large-amplitude reciprocating motion) is converted into regular volume changes of the elastic capsule 601. Through the synergistic effect of the one-way valve, the disordered vibration energy is converted into directional fluid kinetic energy, realizing energy recovery-type micro-pumping and achieving a balance between vibration reduction and pumping functions.

[0068] By selecting materials and designing the structure, the high-frequency vibrations that are harmful to the equipment are dissipated first, and the remaining, more regular vibration energy is used to serve the anti-cavitation liquid replenishment function. The two complement each other and jointly improve the overall performance and stability of the equipment.

[0069] Working principle: When the motor body 1 starts, it drives the gear pump component 3 to run. Liquid flows into the spiral channel between the protective shell 5 and the motor body 1 to dissipate heat from the motor. At the same time, the vibration generated by the motor is absorbed by the buffer pump component 6 and converted into energy for auxiliary pumping, which replenishes the liquid to the inlet of the gear pump component 3 to ensure stable operation of the system.

[0070] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0071] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cavitation-resistant gear pump, comprising a motor body (1), characterized in that: The outer wall of the motor body (1) is fitted with a protective shell (5); The protective housing (5) is equipped with a gear pump component (3); The output shaft of the motor body (1) is driven to connect with the gear pump component (3); The outer wall of the protective shell (5) is fixedly fitted with a buffer pump assembly (6); The protective housing (5) includes a housing (501), and a spiral support rib (503) is fixedly mounted on the inner wall of the housing (501). The spiral support rib (503) is attached to the outer wall of the motor body (1) to form a spiral liquid flow channel between the housing (501) and the motor body (1). The outer wall of the motor body (1) and the outer wall of the spiral support rib (503) are attached together, and the spiral support rib (503) is arranged in a spiral shape; The gear pump component (3) and the isolation flange (2) located on one side of the output shaft of the motor body (1) are both located inside the protective housing (5); wherein, the outer sides of the gear pump component (3) and the outer edge of the isolation flange (2) are in contact with the inner wall of the protective housing (5); and the space of the gear pump component (3) near the bottom is connected to the spiral liquid flow channel through a guide slot (4); The buffer pumping assembly (6) is further provided with a buffer component for connecting to the protective housing (5) on the outer wall of the side closest to the protective housing (5); The buffer component includes two sets of elastic supports (603), and the inner walls of the two sets of elastic supports (603) are fixedly fitted with elastic bladders (601). The two sets of elastic bladders (601) are connected by a connecting pipe (602). The end of the set of elastic bladders (601) near the gear pump component (3) is connected to an output pipe (604). Both sets of elastic bladders (601) are connected to one-way valves at opposite ends. The buffer pump assembly (6) is fixedly assembled through the elastic support (603) and the outer wall of the protective shell (5). The end of the output pipe (604) and the liquid flow space formed between the bottom of the gear pump component (3) and the protective shell (5) are connected.

2. The cavitation-resistant gear pump according to claim 1, characterized in that: The gear pump component (3) includes a pump housing (301), one end of which is connected to a liquid outlet (302), and the other end of which is connected to a liquid inlet (303). The inner wall of the pump housing (301) is rotatably connected to a drive gear (304) and a driven gear (305).

3. The cavitation-resistant gear pump according to claim 2, characterized in that: The outer wall of the housing (501) near the gear pump component (3) has a receiving cavity (502).

4. The cavitation-resistant gear pump according to claim 3, characterized in that: The spiral support rib (503) is made of foam metal material or polymer composite material.

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