Energy-saving vertical centrifugal foam pump

Abstract

A volute of the energy-saving type vertical centrifugal foam pump comprises a rigid shell and an elastic lining which are coaxially arranged, the outer side wall of the elastic lining and the inner wall of the rigid shell are connected in a sealed mode and form a closed control cavity, and a plurality of elastic frameworks are distributed in the control cavity; the pump body is provided with a jet vacuum generator, the jet vacuum generator comprises a nozzle inlet, a throat pipe suction chamber and a diffusion pipe outlet which are communicated in sequence, the nozzle inlet is communicated with the liquid discharge pipe through a high-pressure drainage pipe, and the diffusion pipe outlet is communicated to a low-pressure backflow area of the pump body; a negative pressure feedback pipe is connected between the throat pipe suction chamber and the control cavity, and when pumped fluid passes through the nozzle inlet, negative pressure generated in the throat pipe suction chamber sucks the control cavity, so that the elastic lining extrudes the elastic framework and is attached to the rigid shell. The energy of high-pressure fluid at a pump outlet is utilized, controllable negative pressure is generated through the jet flow vacuum generator, the elastic lining is driven to generate radial shrinkage deformation, the section of a volute flow channel is dynamically optimized, and cavitation can be actively restrained.

Description

An energy-saving vertical centrifugal foam pump Technical Field

[0001] This application relates to the technical field of fluid transport machinery, and in particular to an energy-saving vertical centrifugal foam pump. Background Technology

[0002] Centrifugal foam pumps are widely used in numerous industrial sectors, including mining, metallurgy, chemical engineering, and environmental protection, as a general-purpose fluid transport device. They are widely used to transport media containing solid particles, gases, or easily foaming substances. However, traditional centrifugal pumps face severe technical challenges when handling materials such as foamed mineral slurries, foaming chemical raw materials, or wastewater with high gas content. When the pumped medium contains a large number of air bubbles, these bubbles rapidly burst after entering the high-pressure zone between the impeller blades. This process not only generates severe vibration and noise but, more importantly, causes localized impacts and high temperatures, leading to severe cavitation damage on the impeller and volute surfaces. Cavitation significantly shortens the pump's service life. Furthermore, the presence of air bubbles disrupts the continuity of the liquid within the impeller flow channel, causing a sharp drop in pump head, unstable flow rate, and even "air binding," rendering the pump completely unable to self-prime, resulting in system interruption and significant economic losses and safety risks.

[0003] To address this issue, some attempts have been made in the prior art, such as installing a degassing device before the pump inlet or using a self-priming structure. However, these solutions are often complex in structure, energy-intensive, and ineffective against air bubbles that have already entered the pump.

[0004] Therefore, how to suppress cavitation in real time and actively while pumping aerobic foam media and ensure the efficient and stable operation of the pump has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] To address the problem that existing foam pumps struggle to suppress cavitation in real time and actively while ensuring efficient operation, this application provides an energy-saving vertical centrifugal foam pump.

[0006] This application provides an energy-saving vertical centrifugal foam pump with the following technical solution: An energy-saving vertical centrifugal foam pump includes a volute, a pump body, an impeller, a main shaft, a discharge pipe on the volute, and a suction pipe on the pump body. The volute includes a rigid outer shell and an elastic inner liner coaxially arranged. The outer wall of the elastic inner liner is sealed to the inner wall of the rigid outer shell to form a closed control cavity. Multiple elastic skeletons are distributed in the control cavity. A jet vacuum generator is provided on the pump body. The jet vacuum generator includes a nozzle inlet, a throat suction chamber, and a diffuser outlet connected in sequence. The nozzle inlet is connected to the discharge pipe through a high-pressure drainage pipe, and the diffuser outlet is connected to the low-pressure reflux zone of the pump body. A negative pressure feedback pipe is connected between the throat suction chamber and the control cavity. When the pumped fluid passes through the nozzle inlet, the negative pressure generated in the throat suction chamber draws the control cavity, causing the elastic inner liner to squeeze the elastic skeletons and adhere to the rigid outer shell.

[0007] Furthermore, the main shaft has an air passage, and the impeller hub has multiple radial air holes communicating with the air passage; the end of the main shaft extending out of the pump body is provided with a rotary air seal joint, and an auxiliary air extraction pipe is connected between the rotary air seal joint and the throat suction chamber.

[0008] Furthermore, the negative pressure feedback pipe and the auxiliary suction pipe are connected together by a three-way flow distribution valve and communicate with the throat suction chamber through the three-way flow distribution valve; the three-way flow distribution valve is configured to reduce the flow of the negative pressure feedback pipe when the gas flow in the auxiliary suction pipe increases instantaneously, causing the vacuum to drop, so as to prioritize the suction of the gas at the center of the impeller.

[0009] Furthermore, a pulse generator is provided on the negative pressure feedback tube to generate pulse fluctuations in the negative pressure within the control cavity, thereby driving the elastic liner to generate radial flutter.

[0010] Furthermore, an inverted V-shaped baffle plate is provided at one end of the high-pressure drainage pipe extending to the drain pipe, with the tip of the inverted V-shaped baffle plate facing the incoming flow direction.

[0011] Furthermore, the outlet of the diffuser tube is connected to a tangential injection tube that communicates with the suction tube. The axis of the tangential injection tube is perpendicular to and eccentrically arranged with the axis of the suction tube, which is used to generate a pre-swirling flow in the suction tube.

[0012] Furthermore, the elastic skeleton is distributed circumferentially along the elastic liner, and the elastic skeleton is set as an Ω-shaped spring steel sheet, with the opening of the elastic skeleton facing the rigid shell and the closed end pre-embedded in the elastic liner.

[0013] Furthermore, the control cavity is filled with a porous material layer to support the elastic liner and ensure unobstructed airflow channels during vacuuming.

[0014] Furthermore, the inner wall of the rigid outer shell is provided with a plurality of limiting protrusions distributed at the gaps between the plurality of elastic skeletons, which are used to limit the extreme expansion position of the elastic liner under the maximum negative pressure state.

[0015] Furthermore, the portion of the elastic liner on which the elastic skeleton is mounted is integrally formed with a mounting platform, the mounting platform having an embedded woven reinforcement layer, and the closed end of the elastic skeleton being mounted on the mounting platform.

[0016] In summary, the beneficial technical effects of this application are as follows: 1. Utilizing the energy of the high-pressure fluid at the pump outlet, a controllable negative pressure is generated in the throat suction chamber through a jet vacuum generator. This negative pressure, on the one hand, draws air from the volute control chamber through the negative pressure feedback pipe, driving the elastic liner to produce radial contraction deformation, dynamically optimizing the volute flow channel cross-section to adapt to the compressible characteristics of the foam fluid; on the other hand, it actively draws air from the impeller center area through the auxiliary suction pipe, directly eliminating the root cause of air binding; and the three-way flow distribution valve realizes the adaptive feedback control of degassing priority, which can automatically prioritize the exhaust of the impeller when encountering a sudden large amount of gas, effectively improving the problem of easy air binding and flow interruption in centrifugal foam pumps; 2. Through the coupling of the elastic design of the volute liner and the negative pressure of the control chamber, when the pumping load increases and the head increases, the pressure of the discharge pipe increases, resulting in enhanced suction negative pressure. The elastic liner expands outward, causing the volute to... 1. The flow channel automatically widens, reducing the internal flow velocity, thus ensuring that the foam pump always operates as close as possible to the optimal hydraulic efficiency point under varying operating conditions; 2. The jet generator discharges a gas-liquid mixture containing waste gas, generating a strong pre-swirling flow tangentially into the suction pipe of the injection pump. This pre-swirling flow applies a centrifugal field before the fluid enters the impeller, promoting solid-liquid adhesion to the wall and gas centralization, greatly reducing the gas-liquid separation burden inside the impeller. This, combined with the central air channel and radial air holes, forms a perfect synergistic effect, significantly improving the volumetric efficiency of the foam pump; 3. A pulse generator is used to excite pressure pulsation in the high-pressure drainage pipe, converting constant negative pressure into alternating negative pressure, driving the elastic liner supported on the elastic frame to generate radial high-frequency flutter. This setup can actively break up the attached foam and shake off the attached scale layer using fluid pulsation without adding any moving parts, maintaining the long-term unobstructed flow channel. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 is a schematic diagram of a partial cross-sectional structure of an embodiment of this application; Figure 3 is a schematic diagram of a cross-sectional structure of a jet vacuum generator of an embodiment of this application; Figure 4 is a schematic diagram of a partial cross-sectional structure of a volute of an embodiment of this application; Figure 5 is a schematic diagram of a cross-sectional structure along an embodiment of this application.

[0018] Explanation of reference numerals in the attached drawings: 1. Volute; 11. Drain pipe; 12. Rigid outer shell; 13. Elastic liner; 2. Pump body; 21. Suction pipe; 3. Impeller; 31. Radial air hole; 4. Main shaft; 41. Central air passage; 42. Rotary air seal joint; 51. Control chamber; 52. Porous material layer; 6. Elastic skeleton; 61. Mounting platform; 7. Jet vacuum generator; 71. Nozzle inlet; 72. Throat suction chamber; 73. Diffusion tube outlet; 74. Tangential injection pipe; 81. High-pressure drainage pipe; 82. Negative pressure feedback pipe; 83. Auxiliary suction pipe; 84. Three-way flow distribution valve; 85. Pulse generator; 86. Vacuum degree detector. Detailed Implementation

[0019] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] This application discloses an energy-saving vertical centrifugal foam pump. Referring to Figures 1, 2, and 3, it includes a volute 1, a pump body 2, an impeller 3, a main shaft 4, a drain pipe 11 disposed on the volute 1, and a suction pipe 21 disposed on the pump body 2. Specifically, the pump body 2 is inverted conical and connected to the top of the volute 1, and the suction pipe 21 is tangentially disposed to the outer wall of the pump body 2 and located at the top of the pump body 2. These are all prior art technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon.

[0021] Mainly, the volute 1 includes a rigid outer shell 12 and an elastic inner liner 13 arranged coaxially. The outer wall of the elastic inner liner 13 is sealed to the inner wall of the rigid outer shell 12 to form a closed control cavity 51. Multiple elastic skeletons 6 are distributed in the control cavity 51. The elastic inner liner 13 is preferably made of wear-resistant rubber or polyurethane material and is sealed to the inner wall of the rigid outer shell 12 by vulcanization or bonding to form the closed control cavity 51.

[0022] A jet vacuum generator 7 is provided on the pump body 2. The jet vacuum generator 7 includes a nozzle inlet 71, a throat suction chamber 72 and a diffuser outlet 73 connected in sequence. The nozzle inlet 71 is connected to the drain pipe 11 through a high-pressure drain pipe 81, and the diffuser outlet 73 is connected to the low-pressure reflux zone of the pump body 2. A negative pressure feedback pipe 82 is connected between the throat suction chamber 72 and the control chamber 51. When the pumped fluid passes through the nozzle inlet 71, the negative pressure generated in the throat suction chamber 72 draws the control chamber 51, causing the elastic liner 13 to squeeze the elastic skeleton 6 and adhere to the rigid outer shell 12.

[0023] Specifically, referring to Figures 2 and 4, the elastic skeleton 6 is distributed circumferentially along the elastic liner 13. The elastic skeleton 6 is set as an Ω-shaped spring steel sheet, with the opening of the elastic skeleton 6 facing the rigid outer shell 12 and the closed end pre-embedded in the elastic liner 13. Furthermore, the portion of the elastic liner 13 where the elastic skeleton 6 is mounted has an integrally formed mounting platform 61, in which a woven reinforcement layer is embedded. The closed end of the elastic skeleton 6 is mounted on the mounting platform 61. The woven reinforcement layer can be a steel wire mesh or an aramid fiber layer, which ensures that the elastic liner 13 will not be excessively stretched or torn locally when it expands and compresses the elastic skeleton 6, thus guaranteeing the structural durability and controllable deformation of the elastic liner 13. It also suppresses localized inner wall protrusion after the elastic liner 13 expands outward, ensuring that the inner wall of the elastic liner 13 is as smooth as possible to facilitate fluid flow.

[0024] Therefore, when the foam pump of this application is operating normally, the high-pressure drain pipe 81 introduces the high-pressure fluid in the drain pipe 11 into the nozzle inlet 71. The high-pressure fluid is accelerated and ejected at the nozzle inlet 71, converting pressure energy into kinetic energy, which can create a negative pressure in the throat suction chamber 72. This negative pressure is transmitted to the control chamber 51 through the negative pressure feedback pipe 82, causing the elastic liner 13 to be subjected to an outward suction force, squeezing the elastic skeleton 6 and adhering it to the rigid outer shell 12, resulting in an increase in the effective flow channel cross-section of the volute 1, and the fluid stably filling the volute 1. When the foam concentration increases and the fluid compressibility increases, the outlet pressure of the foam pump naturally decreases, the negative pressure generated by the jet vacuum generator 7 weakens, and the rebound force of the elastic skeleton 6 causes the elastic liner 13 to expand inward, reducing the effective flow channel cross-section of the volute 1 and increasing the flow rate to maintain the stability of the gas-liquid mixing state.

[0025] Furthermore, when the pumped foam has a high gas content and the compressibility of the medium increases, the pressure pulsation inside the volute 1 intensifies, and the negative pressure in the throat suction chamber 72 also fluctuates accordingly. This causes changes in the negative pressure in the control chamber 51, resulting in a fine adjustment of the effective flow channel cross-section of the volute 1, constantly tracking and optimizing the flow under the current medium conditions. This achieves passive adaptive adjustment of the effective volume of the volute 1 to the gas-liquid ratio of the medium, enabling the foam pump to operate close to its high-efficiency point under various working conditions, fundamentally achieving the dual goals of energy saving and cavitation prevention.

[0026] To prevent the elastic liner 13 from excessively conforming to the rigid outer shell 12 when the control chamber 51 is evacuated, which could lead to the evacuation port being blocked or the airflow being obstructed.

[0027] In one feasible embodiment, referring to Figures 2 and 4, the control cavity 51 is filled with a porous material layer 52 to support the elastic liner 13 and ensure unobstructed airflow channels during vacuuming. Specifically, the porous material layer 52 can be open-cell foam metal (such as foamed nickel or foamed copper), open-cell foam plastic, or sintered metal fiber felt. It possesses sufficient compressive strength to support the elastic liner 13 and prevent excessive collapse. Simultaneously, the continuous pores in the porous material layer 52 form a stable channel that ensures unobstructed negative pressure transmission, allowing for smoother and more uniform deformation of the elastic liner 13.

[0028] In another feasible embodiment, the inner wall of the rigid outer shell 12 is provided with multiple limiting protrusions (not shown in the figure) distributed at the gaps between the multiple elastic skeletons 6, which are used to limit the extreme expansion position of the elastic liner 13 under the maximum negative pressure state. Through the cooperation of multiple limiting protrusions and multiple elastic skeletons 6, a mechanical stop can also be formed between the elastic liner 13 and the rigid shell, which fundamentally eliminates the risk of the elastic liner 13 collapsing excessively due to excessive negative pressure or control failure, thus blocking the airflow channel or damaging itself.

[0029] In addition, referring to Figures 1, 2 and 5, the main shaft 4 has an air passage 41, and the impeller 3 has a plurality of radial air holes 31 that communicate with the air passage 41 at the hub; the end of the main shaft 4 that extends out of the pump body 2 is provided with a rotary air seal joint 42, and an auxiliary air extraction pipe 83 is connected between the rotary air seal joint 42 and the throat suction chamber 72.

[0030] Furthermore, the negative pressure feedback pipe 82 and the auxiliary suction pipe 83 are connected to a three-way flow distribution valve 84 and are connected to the throat suction chamber 72 through the three-way flow distribution valve 84. The three-way flow distribution valve 84 is configured to reduce the flow rate of the negative pressure feedback pipe 82 when the gas flow rate in the auxiliary suction pipe 83 increases instantaneously, causing the vacuum level to drop, so as to prioritize the suction of the gas in the center of the impeller 3.

[0031] Specifically, a flow monitor or vacuum detector 86 is installed on the auxiliary extraction pipe 83 to monitor the gas flow rate or vacuum changes in the auxiliary extraction pipe 83. It is electrically connected to a pressure divider controller along with the three-way flow distribution valve 84. The pressure divider controller is configured to: when the flow monitor detects a sudden increase in gas flow rate in the auxiliary extraction pipe 83 or the vacuum detector 86 detects a sudden drop in vacuum in the auxiliary extraction pipe 83, control the three-way flow distribution valve 84 to reduce the flow to the negative pressure feedback pipe 82, or even temporarily close it, prioritizing the limited suction capacity to the auxiliary extraction pipe 83. In this embodiment, the vacuum detector 86 is installed on the auxiliary extraction pipe 83.

[0032] Therefore, under stable operating conditions, the three-way flow distribution valve 84 distributes the negative pressure to the negative pressure feedback pipe 82 and the auxiliary suction pipe 83 according to a preset ratio, while simultaneously performing impeller 3 suction and volute 1 volume adjustment. When the incoming foam concentration suddenly increases, the amount of gas gathered at the center of impeller 3 increases sharply, and the gas flow rate in the auxiliary suction pipe 83 increases instantaneously, causing the vacuum level in the throat suction chamber 72 to drop. At this time, if the original distribution ratio is maintained, the vacuum level at the throat suction chamber 72 will drop rapidly due to flow overload, causing both functions to fail.

[0033] By configuring the pressure divider controller, when the flow monitor or vacuum detector 86 detects an abnormal increase in flow rate within the auxiliary extraction pipe 83, it can control the three-way flow distribution valve 84 to automatically reduce the flow cross-sectional area of ​​the negative pressure feedback pipe 82 (or even temporarily close it), prioritizing the allocation of limited negative pressure resources to the auxiliary extraction pipe 83 to ensure continuous suction capacity for the gas at the center of the impeller 3. When the foam concentration returns to normal, the flow rate in the auxiliary extraction pipe 83 decreases, the three-way flow distribution valve 84 resets its distribution ratio, and the parallel extraction state of the dual pipes is restored. This effectively solves the problem of vacuum distribution imbalance caused by competition between the two negative pressure channels, ensuring priority for the most critical exhaust function of the impeller 3 under extreme operating conditions and preventing uncontrolled gas binding effects.

[0034] Furthermore, referring to Figures 1 and 2, a pulse generator 85 is provided on the negative pressure feedback pipe 82 to generate pulse fluctuations in the negative pressure within the variable control chamber 51, thereby driving the elastic liner 13 to generate radial flutter. Additionally, an inverted V-shaped baffle plate (not shown in the figure) is provided at one end of the high-pressure drainage pipe 81 extending to the drain pipe 11. The tip of the inverted V-shaped baffle plate faces the incoming flow direction, utilizing fluid inertia to "bounce" away large solid particles, allowing only finer slurry to enter the high-pressure drainage pipe 81, preventing blockage of the nozzle inlet 71.

[0035] Therefore, the pulse generator 85 generates a fluctuating negative pressure in the control cavity 51, causing the elastic liner 13, supported by the elastic skeleton 6, to generate a high-frequency radial "flutter". This pulse flutter of the elastic liner 13 can not only instantly break up hard air bubbles near the inner wall of the volute 1, but also effectively shake off solid scale adhering to the wall surface of the elastic liner 13 using high-frequency mechanical vibration; combined with the porous material layer 52 and / or limiting bosses in the control cavity 51, it ensures the stability of the flutter space and avoids fatigue tearing of the elastic liner 13, realizing a maintenance-free dynamic self-cleaning volute 1.

[0036] In addition, the diffuser outlet 73 is connected to a tangential injection pipe 74 that communicates with the suction pipe 21. The axis of the tangential injection pipe 74 is perpendicular to the axis of the suction pipe 21 and is eccentrically arranged to generate a pre-swirling flow in the suction pipe 21. That is, the low-pressure reflux zone of the pump body 2 connected to the diffuser outlet 73 is specifically at the suction pipe 21.

[0037] Thus, the central air passage 41, radial air holes 31, and auxiliary extraction pipe 83 on the main shaft 4 form a central degassing module, while the jet diffuser outlet 73 and tangential injection pipe 74 form a pre-swirling module. During operation, the gas-liquid mixture discharged from the jet vacuum generator 7 is injected at high speed into the suction pipe 21 through the tangential injection pipe 74, generating a strong pre-swirling flow (cyclone separation effect) within the suction pipe 21. This pre-swirling flow causes the fluid before entering the impeller 3 to undergo gas-liquid separation in advance. The heavier slurry is thrown against the wall towards the edge of the impeller 3, while the lighter gas is forced towards the center of the impeller 3. At this time, the gas gathered at the center of the impeller 3 is drawn in by the radial air holes 31 of the central degassing module and then extracted by the auxiliary extraction pipe 83 through the main shaft 4.

[0038] Therefore, the foam pump of this application can not only degas using its own high-pressure fluid, but also convert the mixture of the extracted waste gas and power fluid into "pre-swirling" power in the suction pipe 21, forming a virtuous positive feedback loop of "pre-swirling gas separation - central gas suction - jet discharge of gas - re-generation of pre-swirling", achieving extremely high pumping efficiency, greatly suppressing the occurrence of cavitation, and ensuring the efficient and stable operation of the foam pump.

[0039] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An energy-saving vertical centrifugal foam pump, comprising a volute, a pump body, an impeller, a main shaft, a discharge pipe disposed on the volute, and a suction pipe disposed on the pump body, characterized in that, The volute includes a rigid outer shell and an elastic inner liner arranged coaxially. The outer wall of the elastic inner liner is sealed to the inner wall of the rigid outer shell to form a closed control cavity. Multiple elastic skeletons are distributed in the control cavity. A jet vacuum generator is provided on the pump body. The jet vacuum generator includes a nozzle inlet, a throat suction chamber, and a diffuser outlet connected in sequence. The nozzle inlet is connected to the drain pipe through a high-pressure drain pipe, and the diffuser outlet is connected to the low-pressure reflux zone of the pump body. A negative pressure feedback pipe is connected between the throat suction chamber and the control cavity. When the pumped fluid passes through the nozzle inlet, the negative pressure generated in the throat suction chamber draws the control cavity, causing the elastic inner liner to squeeze the elastic skeletons and adhere to the rigid outer shell.

2. The energy-saving vertical centrifugal foam pump according to claim 1, characterized in that, The main shaft has an air passage, and the impeller hub has multiple radial air holes that communicate with the air passage; the end of the main shaft extending out of the pump body is provided with a rotary air seal joint, and an auxiliary air extraction pipe is connected between the rotary air seal joint and the throat suction chamber.

3. The energy-saving vertical centrifugal foam pump according to claim 2, characterized in that, The negative pressure feedback pipe and the auxiliary suction pipe are connected to a three-way flow distribution valve and are connected to the throat suction chamber through the three-way flow distribution valve. The three-way flow distribution valve is configured to reduce the flow of the negative pressure feedback pipe when the gas flow in the auxiliary suction pipe increases instantaneously, causing the vacuum level to drop, so as to prioritize the suction of the gas at the center of the impeller.

4. The energy-saving vertical centrifugal foam pump according to claim 1, characterized in that, A pulse generator is provided on the negative pressure feedback tube to generate pulse fluctuations in the negative pressure in the control cavity, thereby driving the elastic liner to generate radial flutter.

5. An energy-saving vertical centrifugal foam pump according to claim 1, characterized in that, An inverted V-shaped baffle plate is provided at one end of the high-pressure drainage pipe extending to the drain pipe, with the tip of the inverted V-shaped baffle plate facing the incoming flow direction.

6. An energy-saving vertical centrifugal foam pump according to claim 1, characterized in that, The outlet of the diffuser tube is connected to a tangential injection tube that communicates with the suction tube. The axis of the tangential injection tube is perpendicular to the axis of the suction tube and is eccentrically arranged to generate a pre-swirling flow in the suction tube.

7. An energy-saving vertical centrifugal foam pump according to any one of claims 1-6, characterized in that, The elastic skeleton is distributed circumferentially along the elastic liner. The elastic skeleton is configured as an Ω-shaped spring steel sheet. The opening of the elastic skeleton faces the rigid shell, and the closed end is embedded in the elastic liner.

8. An energy-saving vertical centrifugal foam pump according to claim 7, characterized in that, The control cavity is filled with a porous material layer to support the elastic liner and ensure unobstructed airflow channels during vacuuming.

9. An energy-saving vertical centrifugal foam pump according to claim 7, characterized in that, The inner wall of the rigid outer shell is provided with a plurality of limiting protrusions distributed at the gaps between the plurality of elastic skeletons, which are used to limit the ultimate expansion position of the elastic liner under the maximum negative pressure state.

10. An energy-saving vertical centrifugal foam pump according to claim 7, characterized in that, The portion of the elastic liner on which the elastic skeleton is mounted is integrally formed with a mounting platform. The mounting platform has an embedded woven reinforcement layer, and the closed end of the elastic skeleton is mounted on the mounting platform.

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