Anti-cavitation horizontal thick slurry foam pump

Abstract

The utility model relates to the technical field of anti-cavitation horizontal type thick slurry foam pumps, in particular to an anti-cavitation horizontal type thick slurry foam pump which comprises a base, an impeller cover is installed on the top of the base, a three-stage stepped impeller for preventing overlarge local pressure difference caused by instant pressurization of a single-stage impeller is installed in the impeller cover, and the three-stage stepped impeller is installed in the base. The top of the impeller cover is connected with a feeding pipe, and the feeding pipe is provided with a low-pressure-preventing mechanism which is used for preventing a low-pressure area from being generated due to the sudden change of the flow speed when thick slurry raw materials directly enter the impeller, the thick slurry foam is pre-accelerated and rectified through the spiral flow guide plate, and it is ensured that the pressure of a suction cavity is always higher than the saturated vapor pressure of liquid; and meanwhile, under the action of the three-stage stepped impeller, fluid is pressurized step by step, the situation that the local pressure difference is too large due to instant pressurization of a single-stage impeller is avoided, residual bubbles are guided to a low-pressure area through the final-stage pressure relief hole to be slowly released, bubble collapse impact is reduced, and therefore the cavitation prevention effect is achieved.

Description

Technical Field

[0001] This utility model relates to the field of horizontal slurry foam pump technology, and in particular to an anti-cavitation horizontal slurry foam pump. Background Technology

[0002] A horizontal slurry foam pump is a centrifugal pump specifically designed for conveying slurry media containing foam and solid particles. Its working principle is based on centrifugal force. When the pump starts, the motor drives the impeller to rotate at high speed, causing the liquid to be thrown from the center of the impeller to the edge under centrifugal force. This gains energy and propels the liquid into the pump casing at high speed. Inside the casing, the liquid's velocity gradually decreases, converting kinetic energy into pressure energy, and it is eventually transported out through the outlet pipe. Simultaneously, due to the impeller's rotation, a low-pressure zone is created at the impeller's center, drawing the liquid into the pump under atmospheric pressure, thus achieving continuous transport. It can be used to transport chemical slurries containing solid particles and foam, meeting the needs of slurry transport in chemical production, such as the raw material transport for shampoo.

[0003] Currently, concentrated foam (such as high-viscosity shampoo and emulsion containing particles) has poor fluidity during pumping. Sudden changes in local flow velocity lead to a sharp drop in pressure. When the pressure is lower than the liquid's saturated vapor pressure, the liquid vaporizes to form bubbles. Furthermore, horizontal concentrated foam pumps have a simple design, short flow channels, and abrupt changes in cross-section (such as check valves and narrow flow channels). When flowing at high speed, they are prone to generating low-pressure vortex zones, which exacerbate bubble formation and thus cause cavitation.

[0004] Therefore, an anti-cavitation horizontal slurry foam pump is proposed to solve the above problems. Utility Model Content

[0005] The main objective of this invention is to provide an anti-cavitation horizontal slurry foam pump, which aims to solve the technical problems in the prior art.

[0006] This utility model proposes an anti-cavitation horizontal slurry foam pump, comprising: a base, an impeller cover installed on the top of the base, a three-stage stepped impeller installed inside the impeller cover to prevent excessive local pressure difference caused by instantaneous pressurization of a single-stage impeller, a feed pipe connected to the top of the impeller cover, and a low-pressure prevention mechanism installed on the feed pipe to prevent low-pressure zones caused by sudden changes in flow velocity when the slurry raw material directly enters the impeller.

[0007] Preferably, a motor is installed at one top end of the base, and a discharge port is opened at the top of the base away from the motor. A drive shaft is installed on the last stage of the three-stage stepped impeller, and the drive shaft is driven by the motor. The interior of the impeller cover is connected to the interior of the discharge port.

[0008] Preferably, the height of each blade in the three-stage stepped impeller increases and the inclination angle decreases. The last blade of the three-stage stepped impeller has multiple pressure relief holes evenly spaced. The interior of the impeller cover is connected to the interior of the feed pipe. After the three-stage stepped impeller rotates, a negative pressure is formed inside the feed pipe, which drives the concentrated slurry away from the suction.

[0009] Preferably, a conical hopper is installed on the inner wall of the feed pipe, a first bracket is installed on the inner top of the conical hopper, a connecting pipe is installed at the center of the top of the first bracket, a discharge hole is opened at the bottom of the conical hopper, and a spring is fitted on the outer ring surface of the connecting pipe.

[0010] Preferably, the low-pressure protection mechanism is equipped with a mounting cover, which covers the flange at the top of the feed pipe. The top of the mounting cover has a through hole of the same size as and overlapping with the connection hole on the flange. Multiple mounting holes are evenly spaced on the outer ring surface of the mounting cover. The mounting cover is threadedly connected to the outer ring surface of the flange of the feed pipe by bolts passing through the mounting holes.

[0011] Preferably, the top of the mounting cover is provided with a feed hole, and a spiral guide plate is installed inside the feed hole. The spiral guide plate is inserted into the inside of the feed pipe, and a connecting pipe is installed at the bottom of the spiral guide plate. A limit plate is installed at the bottom of the connecting pipe, and the connecting pipe is inserted into the inside of the connecting pipe and slidably connected inside the connecting pipe.

[0012] Preferably, a second bracket is installed on the inner bottom of the feed pipe, and a pressure-reducing column is installed at the top center of the second bracket. The top of the pressure-reducing column matches the size of the bottom discharge hole of the conical hopper, and there is a certain distance between the top of the pressure-reducing column and the bottom of the conical hopper.

[0013] Preferably, when the pressure of the concentrated slurry material inside the spiral guide plate exceeds the set pressure value, the conical hopper moves downward on the inner wall of the feed pipe and the discharge hole at the bottom of the conical hopper fits exactly on the top of the pressure reducing column. After the pressure inside the conical hopper decreases, it automatically moves back to its original position under the action of the spring.

[0014] The beneficial effects of this invention are as follows: This invention pre-accelerates and rectifies the concentrated slurry foam through a spiral guide plate, avoiding the low-pressure zone caused by sudden changes in flow velocity when directly entering the impeller. The gradual change in cross-section design allows the fluid pressure to rise slowly, ensuring that the pressure in the suction chamber is always higher than the liquid saturated vapor pressure, thus suppressing bubble formation. At the same time, under the action of the three-stage stepped impeller, the blade height of each stage increases and the inclination angle decreases. Furthermore, a pressure relief hole is opened in the last stage to pressurize the fluid step by step, avoiding excessive local pressure difference caused by instantaneous pressurization of a single-stage impeller. The pressure relief hole in the last stage guides the residual bubbles to the low-pressure zone for slow release, reducing the impact of bubble collapse, thereby playing a role in preventing cavitation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a cavitation-resistant horizontal slurry foam pump according to this utility model.

[0016] Figure 2 This is an enlarged schematic diagram of the low-pressure protection mechanism of a horizontal cavitation-resistant foam pump according to this utility model.

[0017] Figure 3 This is a cross-sectional view of the feed pipe and an enlarged schematic diagram of the internal components of a horizontal cavitation-resistant foam pump according to this utility model.

[0018] Figure 4 This is a cross-sectional view of the impeller cover and an enlarged schematic diagram of the internal components of a horizontal cavitation-resistant foam pump according to the present invention.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0020] In the diagram: 1. Base; 2. Motor; 3. Impeller cover; 31. Three-stage stepped impeller; 32. Pressure relief hole; 33. Drive shaft; 4. Feed pipe; 41. Conical hopper; 42. First support; 43. Connecting pipe; 44. Spring; 45. Second support; 46. Pressure reducing column; 5. Low-pressure protection mechanism; 51. Mounting cover; 52. Spiral guide plate; 53. Connecting pipe; 6. Discharge port. Detailed Implementation

[0021] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0022] like Figures 1-4 As shown, this application provides an anti-cavitation horizontal slurry foam pump, including: a base 1, an impeller cover 3 installed on the top of the base 1, a three-stage stepped impeller 31 installed inside the impeller cover 3 to prevent excessive local pressure difference caused by instantaneous pressurization of a single-stage impeller, a feed pipe 4 connected to the top of the impeller cover 3, and an anti-low-pressure mechanism 5 installed on the feed pipe 4 to prevent low-pressure zones caused by sudden changes in flow velocity when the slurry material directly enters the impeller. The three-stage stepped impeller 31 can avoid excessive local pressure difference caused by instantaneous pressurization of a single-stage impeller, reducing bubble collapse impact. At the same time, the anti-low-pressure mechanism 5 can prevent low-pressure zones caused by sudden changes in flow velocity when the slurry material directly enters the impeller. The gradual cross-section design makes the fluid pressure rise slowly, ensuring that the suction chamber pressure is always higher than the liquid saturated vapor pressure, inhibiting bubble generation, thereby playing an anti-cavitation role.

[0023] In this embodiment, as Figure 4As shown, the height of each blade in the three-stage stepped impeller 31 increases and the inclination angle decreases. The last blade of the three-stage stepped impeller 31 has multiple pressure relief holes 32 evenly spaced. The interior of the impeller cover 3 is connected to the interior of the feed pipe 4. After the three-stage stepped impeller 31 rotates, it creates a negative pressure inside the feed pipe 4, which drives the slurry away from the suction. Since the three-stage stepped impeller 31 pressurizes the fluid step by step, it avoids excessive local pressure difference caused by instantaneous pressurization of a single impeller. The pressure relief holes 32 at the end guide the residual bubbles to the low-pressure area for slow release, reducing the impact of bubble collapse.

[0024] In this embodiment, as Figure 2 and Figure 3 As shown, a conical hopper 41 is installed on the inner wall of the feed pipe 4. A first support 42 is installed on the inner top of the conical hopper 41. A connecting pipe 43 is installed at the center of the top of the first support 42. A discharge hole is opened at the bottom of the conical hopper 41. A spring 44 is fitted on the outer ring surface of the connecting pipe 43. A second support 45 is installed at the bottom inner side of the feed pipe 4. A pressure-reducing column 46 is installed at the center of the top of the second support 45. The top of the pressure-reducing column 46 matches the size of the discharge hole at the bottom of the conical hopper 41, and there is a certain distance between the top of the pressure-reducing column 46 and the bottom of the conical hopper 41. When the pressure of the concentrated slurry material in the spiral guide plate 52 enters the conical hopper 41 and exceeds the set pressure value, the conical hopper 41 moves downward on the inner wall of the feed pipe 4 and the bottom discharge hole of the conical hopper 41 fits exactly on the top of the pressure reducing column 46. After the pressure inside the conical hopper 41 decreases, it automatically moves back to its original position under the action of the spring 44. Therefore, when the pressure exceeds the set value, the conical hopper 41 automatically moves downward to cooperate with the pressure reducing column 46 to realize the pressure reduction operation. At the same time, it automatically returns to its original position after the pressure decreases, thereby effectively avoiding the situation of excessive pressure during the process of pressurizing to reduce the generation of bubbles.

[0025] In this embodiment, as Figure 1 and Figure 2 As shown, the low-pressure protection mechanism 5 is equipped with a mounting cover 51, which covers the flange at the top of the feed pipe 4. The top of the mounting cover 51 has a through hole of the same size as the connection hole on the flange and coincides with it. Multiple mounting holes are evenly spaced on the outer ring surface of the mounting cover 51. The mounting cover 51 is threaded to the outer ring surface of the flange of the feed pipe 4 by bolts passing through the mounting holes. Therefore, the mounting cover 51 installed on the feed pipe 4 will not affect the connection and sealing performance of the flange.

[0026] In this embodiment, as Figure 2As shown, the top of the mounting cover 51 has a feed hole, and a spiral guide plate 52 is installed inside the feed hole. The spiral guide plate 52 is inserted into the feed pipe 4, and a connecting pipe 53 is installed at the bottom of the spiral guide plate 52. A limit plate is installed at the bottom of the connecting pipe 53. The connecting pipe 53 is inserted into the connecting pipe 43 and is slidably connected inside the connecting pipe 43. Therefore, the concentrated slurry raw material is first fed through the feed hole on the mounting cover 51. At this time, the spiral guide plate 52 pre-accelerates and rectifies the concentrated slurry foam to avoid the low-pressure zone caused by sudden changes in flow rate when it directly enters the impeller. The gradual cross-section design makes the fluid pressure rise slowly, ensuring that the suction chamber pressure is always higher than the liquid saturated vapor pressure and suppressing the generation of bubbles.

[0027] The technical principle of this utility model is as follows: When the anti-cavitation horizontal slurry foam pump is in use, the motor 2 drives the three-stage stepped impeller 31 to rotate, creating a negative pressure in the feed pipe 4. At this time, the slurry raw material enters the spiral guide plate 52 through the feed hole on the mounting cover 51. The spiral guide plate 52 pre-accelerates and rectifies the slurry foam, and then conveys it into the impeller cover 3 through the conical bucket 41. This avoids the low-pressure zone caused by sudden changes in flow velocity when directly entering the impeller. The gradual change of cross-section design makes the fluid pressure rise slowly, ensuring that the pressure in the suction chamber is always higher than the liquid saturated vapor pressure, suppressing bubble formation. At the same time, when the pressure inside the conical bucket 41 exceeds the set value, the conical bucket 41 is inside the feed pipe 4. The conical bucket 41 moves downwards and its bottom discharge hole fits perfectly onto the top of the pressure reducing column 46. After the internal pressure of the conical bucket 41 decreases, it automatically moves back to its original position under the action of the spring 44. This effectively avoids excessive pressure during the pressurization process to reduce bubble generation. In addition, after the concentrated slurry enters the interior of the impeller shroud 3, under the action of the three-stage stepped impeller 31, the height of each blade increases and the inclination angle decreases. Furthermore, a pressure relief hole 32 is opened in the last stage to pressurize the fluid step by step, avoiding excessive local pressure difference caused by instantaneous pressurization of a single impeller. The pressure relief hole 32 in the last stage guides the residual bubbles to the low-pressure area for slow release, reducing the impact of bubble collapse and thus playing a role in preventing cavitation.

[0028] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, apparatus, article, or method that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, apparatus, article, or method. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, apparatus, article, or method that includes that element.

[0029] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A cavitation-resistant horizontal slurry foam pump, comprising: The base (1) is characterized in that: an impeller cover (3) is installed on the top of the base (1), and a three-stage stepped impeller (31) is installed inside the impeller cover (3) to prevent excessive local pressure difference caused by instantaneous pressurization of a single impeller. A feed pipe (4) is connected to the top of the impeller cover (3), and a low-pressure prevention mechanism (5) is installed on the feed pipe (4) to prevent low-pressure areas caused by sudden changes in flow rate when the concentrated slurry raw material directly enters the impeller.

2. The cavitation-resistant horizontal slurry foam pump according to claim 1, characterized in that, A motor (2) is installed at one end of the top of the base (1). A discharge port (6) is opened at the top of the base (1) away from the motor (2). A drive shaft (33) is installed on the last stage of the three-stage stepped impeller (31). The drive shaft (33) is driven by the motor (2). The interior of the impeller cover (3) is connected to the interior of the discharge port (6).

3. The cavitation-resistant horizontal slurry foam pump according to claim 1, characterized in that, The three-stage stepped impeller (31) has an increasing blade height and decreasing tilt angle at each stage. The last stage blade of the three-stage stepped impeller (31) is provided with multiple pressure relief holes (32) at equal intervals. The interior of the impeller cover (3) is connected to the interior of the feed pipe (4). After the three-stage stepped impeller (31) rotates, a negative pressure is formed inside the feed pipe (4) to draw the concentrated slurry away from the suction.

4. The cavitation-resistant horizontal slurry foam pump according to claim 1, characterized in that, A conical hopper (41) is installed on the inner wall of the feed pipe (4). A first support (42) is installed on the inner top of the conical hopper (41). A connecting pipe (43) is installed at the center of the top of the first support (42). A discharge hole is opened at the bottom of the conical hopper (41). A spring (44) is fitted on the outer ring surface of the connecting pipe (43).

5. The cavitation-resistant horizontal slurry foam pump according to claim 1, characterized in that, The low-pressure protection mechanism (5) is equipped with a mounting cover (51), which covers the flange at the top of the feed pipe (4). The top of the mounting cover (51) has a through hole with the same size as the connection hole on the flange and coincident with it. Multiple mounting holes are evenly spaced on the outer ring surface of the mounting cover (51). The mounting cover (51) is threaded to the outer ring surface of the flange of the feed pipe (4) by bolts passing through the mounting holes.

6. A cavitation-resistant horizontal slurry foam pump according to claim 5, characterized in that, The top of the mounting cover (51) is provided with a feed hole, and a spiral guide plate (52) is installed inside the feed hole. The spiral guide plate (52) is inserted into the feed pipe (4). A connecting pipe (53) is installed at the bottom of the spiral guide plate (52). A limit plate is installed at the bottom of the connecting pipe (53). The connecting pipe (53) is inserted into the connecting pipe (43) and is slidably connected inside the connecting pipe (43).

7. The cavitation-resistant horizontal slurry foam pump according to claim 1, characterized in that, The inner bottom of the feed pipe (4) is equipped with a second bracket (45), and a pressure reducing column (46) is installed at the top center of the second bracket (45). The top of the pressure reducing column (46) matches the size of the bottom discharge hole of the conical bucket (41), and there is a certain distance between the top of the pressure reducing column (46) and the bottom of the conical bucket (41).

8. A cavitation-resistant horizontal slurry foam pump according to claim 6, characterized in that, When the slurry material in the spiral guide plate (52) enters the conical bucket (41) and the pressure inside exceeds the set pressure value, the conical bucket (41) moves downward on the inner wall of the feed pipe (4) and the bottom discharge hole of the conical bucket (41) fits exactly on the top of the pressure reducing column (46). After the pressure inside the conical bucket (41) decreases, it automatically moves back to its original position under the action of the spring (44).

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