Anti-cavitation gear pump

Abstract

The invention relates to the technical field of water pumps, and discloses an anti-cavitation gear pump, which comprises a motor main body: the outer wall of the motor main body is sleeved with a protective shell; a gear pump component is arranged on the protective shell; an output shaft of the motor main body is in driving connection with the gear pump component; and a buffer pumping assembly is fixedly assembled on the outer wall of the protective shell. The spiral supporting ribs are used for connecting and supporting the motor body and the shell, the rigidity of the overall structure is enhanced, meanwhile, the shell physically wraps the motor body, direct collision of equipment under complex working conditions such as underground operation is avoided, and the spiral supporting ribs are spirally arranged, so that the inner wall of the shell and the outer wall of the motor body are not prone to falling off. When the motor runs, a spiral liquid flowing channel is naturally formed, and a part of pumped liquid enters the channel and flows in a manner of being attached to the outer wall of the motor main body under the guidance of a spiral path, so that heat generated by running of the motor is efficiently absorbed, and an excellent heat dissipation effect is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water pumps, in particular to a gear pump capable of preventing cavitation. BACKGROUND

[0002] As a key equipment of fluid conveying machinery, water pumps are widely used in industrial production, agricultural irrigation, municipal water supply and daily life. With the development of technology, the requirements for the operation stability, service life, maintenance convenience and multifunctional integration of water pumps are also increasing.

[0003] However, the water pump products in the prior art still have the following deficiencies in actual application:

[0004] Traditional water pumps, especially high-power centrifugal pumps, will produce intense vibration and loud noise during high-speed operation due to reasons such as imbalance of the motor rotor, pressure pulsation of the fluid in the pump cavity and cavitation phenomenon. In order to suppress vibration, the conventional solution is usually to additionally install an independent vibration reduction base, rubber vibration isolation pad or spring damper outside the water pump. This "external" vibration reduction method not only increases the overall volume and weight of the equipment, improves the installation complexity and cost, but also has limited vibration reduction effect, and it is difficult to fundamentally solve the long-term damage caused by vibration to the pump body itself and the pipeline system.

[0005] The motor, as the power core of the water pump, will generate a large amount of heat during long-term operation. The traditional heat dissipation method relies on the heat dissipation fins of the motor shell for natural water cooling.

[0006] The stability of the flow field at the inlet of the water pump is crucial to the performance of the entire pump. The vibration of the equipment itself may induce small cavitation or cause local pressure fluctuations in the liquid at the inlet area. This unstable flow field will affect the fill level of the impeller, leading to fluctuations in the output flow, and in severe cases, it may even cause cavitation, causing irreversible damage to the impeller.

[0007] In summary, the water pumps in the prior art often use independent solutions for vibration reduction, heat dissipation and operation stability, and lack an integrated design that can systematically and integrally solve the above-mentioned multiple problems.

[0008] Therefore, it is of great practical significance and broad market prospect to develop a new type of water pump with compact structure, efficient vibration reduction, active heat dissipation and stable flow field functions. SUMMARY

[0009] The present application provides a gear pump capable of preventing cavitation, which solves the problems raised in the background art.

[0010] The present application provides the following technical solution: A gear pump capable of preventing cavitation, comprising a motor body:

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

[0012] A gear pump component is provided inside the protective shell;

[0013] The output shaft of the motor body is drivingly connected to the gear pump component;

[0014] The outer wall of the protective shell is fixedly equipped with a buffer pumping component.

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

[0016] As a preferred technical solution of the present invention: the protective shell includes a shell, and an accommodating cavity is formed on the outer wall of the shell on one side close to the gear pump component.

[0017] As a preferred technical solution of the present invention: the inner wall of the shell is fixedly equipped with spiral support ribs, and the spiral support ribs are in contact with the outer wall of the motor body to form a spiral liquid flow channel between the shell and the motor body.

[0018] As a preferred technical solution of the present invention: the spiral support ribs are 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 several of the spiral support ribs are arranged in a spiral shape. The gear pump component is located between the sealing end side of the protective shell and the motor body. The outer sides of the gear pump component are fitted together with the inner wall of the protective shell, and the outer edge of the isolation flange arranged on the output shaft side of the motor body is fitted together with the inner wall of the protective shell. The space near the bottom side 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 technical solution of the present invention: a buffer component for connecting to the protective shell is further provided on the outer wall of the buffer pumping assembly close to the protective shell.

[0021] As a preferred technical solution of the present invention: the buffer component includes two groups of elastic supports, the inner walls of the two groups of elastic supports are fixedly equipped with elastic bags, the two groups of elastic bags are connected by a connecting pipe, and the end of the group of elastic bags close to the gear pump component is connected to the output pipe.

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

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

[0024] 1. This anti-cavitation gear pump uses spiral support ribs as a connection and support between the motor body and the housing, enhancing the rigidity of the overall structure. At the same time, the housing physically covers the motor body, preventing direct collisions with the equipment 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. 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.

[0025] The spiral support ribs and the buffer pumping assembly do not work in isolation; instead, they form a virtuous cycle of functionality. First, the efficient heat dissipation provided by the spiral support ribs ensures that the motor operates within the optimal temperature range, achieving two positive effects: first, the motor's output power and speed are more stable, fundamentally reducing pump flow and pressure pulsation; second, they reduce wear on mechanical components caused by overheating, thereby weakening the intensity of the equipment's own vibration sources.

[0026] On this basis, the buffer pumping component faces a vibration that has been "pre-treated" and has lower intensity, which makes its passive vibration reduction effect better. At the same time, its function of using vibration energy to assist pumping has also become more efficient and controllable. By converting the weakened vibration "waste energy" into fluid kinetic energy that is supplemented to the pump inlet, it accurately suppresses cavitation that may be caused by tiny pressure fluctuations. The combination of "source suppression (stabilizing the motor)" and "end elimination (inlet fluid replenishment)" jointly achieves anti-cavitation performance.

[0027] 2. When the motor of the anti-cavitation gear pump is running, it will inevitably generate vibrations, which will be transmitted to the protective shell, causing the elastic support and the internal elastic bag to undergo periodic compression and rebound deformation;

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

[0029] When the elastic bag is compressed, the liquid or air inside will be discharged through the one-way valve at one end; when its shape is restored, a negative pressure is formed inside, which will suck liquid from the outside through the one-way valve at the other end, through repeated compression-rebound cycles, the elastic bag constitutes a miniature pump driven by vibration;

[0030] Through the output pipe, the inhaled liquid is continuously supplemented to the inlet area of the gear pump component to supplement the main flow, while effectively supplementing the local low pressure area or micro air cavity that may be generated at the inlet due to vibration, ensuring that the gear pump component inhales full liquid, thereby ensuring the stability of the pumping flow and avoiding cavitation. BRIEF DESCRIPTION OF DRAWINGS

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

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

[0033] Figure 3 is a guide notch structure schematic diagram of the present application;

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

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

[0036] Figure 6 is an elastic bag structure schematic diagram of the present application;

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

[0038] In the figure: 1, motor main body; 2, isolation flange; 3, gear pump component; 4, guide notch; 5, protective shell; 6, buffer pumping assembly;

[0039] 301, pump shell; 302, liquid outlet; 303, liquid inlet; 304, driving gear; 305, driven gear;

[0040] 501, shell; 502, containing cavity; 503, spiral support rib;

[0041] 601, elastic bag; 602, communication pipe; 603, elastic support; 604, output pipe. DETAILED DESCRIPTION

[0042] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of the present application.

[0043] Please refer to Figure 1 - Figure 7 The anti-erosion gear pump comprises a motor body 1, an isolation flange 2 fixedly arranged on the outer wall of the motor body 1 near the output end, a gear pump component 3 arranged on the output shaft of the motor body 1, a flow guide notch 4 formed in 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 assembly 6 fixedly arranged on the outer wall of the protective shell 5.

[0044] In the embodiment, the motor body 1 serves as a power source. The isolation flange 2 is fixedly arranged on the outer wall of the output end of the motor body 1 by means of bolts or integral molding, and is used for connecting with an external pipeline system. The gear pump component 3 is drivingly connected to the power input end of the gear pump component 3 on the output shaft of the motor body 1 by means of key connection or spline connection.

[0045] In order to protect and dissipate heat of the motor body 1, the protective shell 5 is sleeved on the outer wall of the motor body 1. A fluid passage is formed between the protective shell 5 and the motor body 1. The buffer pumping assembly 6 is further fixedly arranged on the outer wall of the protective shell 5, and is used for absorbing vibration and assisting pumping.

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

[0047] In a preferred embodiment, the gear pump component 3 comprises a pump shell 301, a liquid outlet 302 communicated with one end of the pump shell 301, a liquid inlet 303 communicated with the other end of the pump shell 301, and a driving gear 304 and a driven gear 305 rotatably connected to the inner wall of the pump shell 301, respectively.

[0048] In a preferred embodiment, the protective shell 5 comprises a shell body 501, and the shell body 501 is provided with a containing cavity 502 on the outer wall of one side close to the gear pump component 3.

[0049] The inner wall of the shell body 501 is fixedly arranged with a spiral support rib 503, which is in close contact with the outer wall of the motor body 1, so as to form a spiral liquid flow passage between the shell body 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 in close contact, the spiral support rib 503 is arranged in a spiral shape, the gear pump component 3 is located between the sealed end of the protective shell 5 and the motor body 1, the outer edge of the isolation flange 2 arranged on one side of the output shaft of the motor body 1 is in close contact with the inner wall of the protective shell 5, and the space on the side close to the bottom of the gear pump component 3 is connected through the flow guide slot 4 and the space between the protective shell 5 and the motor body 1.

[0051] In the above structure, the spiral support rib 503 is used as the connection between the motor body 1 and the shell 501, so that the vibration generated during the operation of the motor body 1 can be conducted through the spiral support rib 503, and the motor body 1 is covered by the shell 501, so that a liquid flow space is formed between the shell 501 and the motor body 1. At the same time, the space on the side close to the bottom of the gear pump component 3 is connected through the flow guide slot 4 and the space between the protective shell 5 and the motor body 1, so that when the gear pump component 3 is operating, the liquid outside enters the inner cavity of the pump shell 301 through the liquid inlet 303. By arranging the liquid inlet 303 on the side close to the bottom of the gear pump component 3, and the space is connected through the flow guide slot 4 and the space between the protective shell 5 and the motor body 1, the liquid between the protective shell 5 and the motor body 1 realizes flow;

[0052] The spiral support rib 503 is arranged in a spiral shape, so that the liquid between the shell 501 and the motor body 1 can be guided through the spiral support rib 503, and then flow;

[0053] The liquid flows along the outer wall of the motor body 1, so that the efficiency of absorbing the heat generated by the operation of the motor body 1 is further improved;

[0054] On the other hand, the motor body 1 is covered by the shell 501, which can prevent the equipment from directly colliding with the construction environment when it is lowered into the construction environment.

[0055] Further, the preparation material of the spiral support rib 503 is not limited to a single type.

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

[0057] In other optional embodiments, the spiral support rib 503 can also be made of composite material with specific functions.

[0058] For example, when the spiral support rib 503 is made of foamed metal or polymer composite material with high damping characteristics, the spiral support rib 503 can absorb and dissipate part of the vibration energy transmitted by the motor body 1 while providing support and flow guiding functions, thereby further enhancing the shockproof effect of the whole machine.

[0059] In a preferred embodiment, the buffer pumping assembly 6 is further provided with a buffer component for connecting with the protective shell 5 on one side of the outer wall of the protective shell 5.

[0060] In a preferred embodiment, the buffer component comprises two sets of elastic supports 603, the inner walls of the two sets of elastic supports 603 are fixedly assembled with elastic bags 601, the two sets of elastic bags 601 are communicated through a communication pipe 602, and the end of one set of elastic bags 601 near the gear pump component 3 is communicated with an output pipe 604.

[0061] In a preferred embodiment, the opposite ends of the two sets of elastic bags 601 are communicated with one-way valves, the buffer pumping assembly 6 is fixedly assembled with the outer wall of the protective shell 5 through the elastic supports 603, and 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 communicated.

[0062] In the above structure, the buffer pumping assembly 6 is fixedly assembled with the outer wall of the protective shell 5 through the elastic supports 603, and the inner walls of the elastic supports 603 and the elastic bags 601 are fixedly assembled, so that when the motor body 1 drives the gear pump component 3 to operate, the vibration of the motor body 1 drives the elastic supports 603 to deform, and the elastic supports 603 drive the elastic bags 601 to deform, and the one-way valves communicated with the opposite ends of the elastic bags 601 enable the air or liquid in the inner cavity of the elastic bags 601 to be discharged through the one-way valve near the gear pump component 3 when the elastic bags 601 are contracted, and the negative pressure in the inner cavity of the elastic bags 601 enables the liquid outside to be sucked through the one-way valve away from the gear pump component 3 when the elastic bags 601 are restored;

[0063] Through repeated shape contraction and shape restoration of the elastic bags 601, the elastic bags 601 and the elastic supports 603 can not only absorb vibration, but also transmit liquid;

[0064] When the motor body 1 drives the protective shell 5 to vibrate, there is a certain amount of air between the device and the liquid at the liquid inlet 303 of the gear pump component 3, and the elastic bags 601 and the output pipe 604 transmit 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 in the liquid flow space, and ensuring the increase of the liquid pumping flow rate realized by the operation of the motor body 1 driving the gear pump component 3;

[0065] The elastic bladder 601 is preferably made of nitrile rubber or fluororubber with high elastic hysteresis characteristics. Such materials are not only oil-resistant and wear-resistant, but also, under forced vibration, the friction of the internal molecular chains dissipates a portion of the vibration energy. This energy is dissipated in the form of heat energy, thereby achieving passive damping of high-frequency vibrations.

[0066] At the same time, the elastic bag 601 is designed as a bellows structure with multiple annular corrugations, so that it can produce a large volume change under the action of axial vibration; the one-way valves at both ends are preferably self-weighted or spring-loaded miniature reed valves. When the elastic bag 601 is compressed due to the vibration of the equipment, its internal pressure rises instantly, 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 bag 601 rebounds and expands, negative pressure is formed inside. At this time, the outlet one-way valve is closed, and the inlet one-way valve is sucked open, sucking liquid from the outside.

[0067] Part of the vibration energy (mainly high-frequency, disordered impact) is absorbed and dissipated by the damping properties of the material, achieving vibration reduction; while the other part of the energy (mainly low-frequency, large-amplitude reciprocating motion) is converted into regular volume changes of the elastic bag 601. Through the coordinated action of the one-way valve, the disordered vibration energy is converted into directional fluid kinetic energy, realizing energy-recovering micro-pumping and achieving a balance between vibration reduction and pumping functions.

[0068] Through material selection and structural design, 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 fluid replenishment function. The two complement each other and jointly improve the overall performance and stability of the equipment.

[0069] Working principle: the motor body 1 starts, driving the gear pump component 3 to run, and the liquid flows into the spiral channel between the protective shell 5 and the motor body 1 to dissipate heat for the motor. At the same time, the vibration generated by the motor is absorbed by the buffer pumping component 6 and converted into energy for auxiliary pumping, replenishing 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, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0071] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. An anti-cavitation gear pump, comprising a motor body (1), characterized in that: The outer wall of the motor body (1) is sleeved with a protective shell (5); A gear pump component (3) is provided inside the protective housing (5); The output shaft of the motor body (1) is drivingly connected to the gear pump component (3); The outer wall of the protective shell (5) is fixedly equipped with a buffer pumping assembly (6).

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

3. The anti-cavitation gear pump according to claim 2, characterized in that: The protective shell (5) comprises a shell (501), and an accommodating cavity (502) is provided on an outer wall of a side of the shell (501) close to the gear pump component (3).

4. The anti-cavitation gear pump according to claim 3, characterized in that: The inner wall of the housing (501) is fixedly equipped with a spiral support rib (503), and the spiral support rib (503) is fitted with the outer wall of the motor body (1) to form a spiral liquid flow channel between the housing (501) and the motor body (1).

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

6. The anti-cavitation gear pump according to claim 4, characterized in that: The outer wall of the motor body (1) and the outer wall of the spiral support ribs (503) are in contact with each other, and a plurality of the spiral support ribs (503) are arranged in a spiral shape; The gear pump component (3) and the isolation flange (2) provided 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 edges of the isolation flange (2) are both in contact with the inner wall of the protective housing (5); and the space near the bottom side of the gear pump component (3) is connected to the spiral liquid flow channel through a guide groove (4).

7. The anti-cavitation gear pump according to claim 1, characterized in that: A buffer component for connecting to the protective shell (5) is further provided on an outer wall of the buffer pumping assembly (6) on one side close to the protective shell (5).

8. The anti-cavitation gear pump according to claim 1, characterized in that: The buffer component includes two groups of elastic supports (603), the inner walls of the two groups of elastic supports (603) are fixedly equipped with elastic bags (601), the two groups of elastic bags (601) are connected through a connecting pipe (602), and the end of the group of elastic bags (601) close to the gear pump component (3) is connected to an output pipe (604).

9. The anti-cavitation gear pump according to claim 8, characterized in that: The opposite ends of the two groups of elastic sacs (601) are both connected to a one-way valve, 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).

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