Impeller for granular medium delivery pump and granular medium delivery pump

Abstract

The invention provides an impeller for a granular medium delivery pump and the granular medium delivery pump. The impeller comprises blades and a cover plate, and a plurality of short back ribs are arranged on the side face of the periphery of the cover plate at intervals in the rotating direction. According to the impeller, the short back ribs are arranged on the cover plate of the impeller, particulate matter entering the cavity between the cover plate and the protective plate can be effectively reduced, the particulate matter is prevented from entering the cavity along with centrifugal force brought by rotation of the impeller, and a flow passage component is effectively protected.

Description

Technical Field

[0001] The invention relates to the field of granular medium conveying equipment, and in particular to an impeller for a granular medium conveying pump and a granular medium conveying pump. Background Art

[0002] Single-stage double-suction centrifugal pumps are mostly used in chemical, fertilizer, metallurgy, papermaking, sugar, pharmaceutical, coal washing, sewage treatment and other industries as a tool for conveying clean or corrosive media with trace solid particles. During use, the cover plate of the centrifugal pump impeller and the volute casing are prone to wear due to long-term conveying of medium containing particles, which in turn affects the working efficiency of the pump. The existing method is to add a sealing ring to prevent the granular medium from entering the cavity between the cover plate and the volute casing of the centrifugal pump impeller, but with long-term operation, the presence of granular media will cause the sealing ring to fail, resulting in wear of the pump body flow components. Summary of the invention

[0003] In view of this, an object of the present invention is to provide an impeller for a granular medium delivery pump and a granular medium delivery pump, wherein the granular medium delivery pump can effectively reduce the damage to the cover plate and the guard plate of the impeller caused by the delivery of the granular medium.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] In a first aspect, an impeller for a granular medium delivery pump is provided, the impeller comprising blades and a cover plate, wherein a plurality of short back ribs are arranged at intervals on an outer peripheral side surface of the cover plate along a rotation direction.

[0006] In some embodiments of the present application, the short back ribs are spaced apart by a distance of 5-10 mm.

[0007] In some embodiments of the present application, the height of the short back rib is less than or equal to 20 mm.

[0008] In a second aspect, a particle medium conveying pump is provided, comprising a pump body, any of the above-mentioned impellers, and a rotating shaft for driving the impeller to rotate; the impeller is connected to the rotating shaft; both ends of the rotating shaft are provided with bearing assemblies sleeved on the rotating shaft, and the bearing assemblies are connected and fixed to the pump body; a sealing assembly is provided between the impeller and the pump body.

[0009] In some embodiments of the present application, the pump body includes an outer shell and a volute, and the bearing assembly is connected and fixed to the outer shell; the impeller is arranged in the volute, and guard plates are arranged on the left and right sides of the volute, and a sealing assembly is arranged between the impeller and the guard plates.

[0010] In some embodiments of the present application, a third seal is provided at the assembly point between the guard plate and the impeller inlet.

[0011] In some embodiments of the present application, a first seal and a second seal are axially arranged between the guard plate and the cover plate of the impeller.

[0012] In some embodiments of the present application, the guard plates on both sides of the volute are provided with water seal interfaces, and the water seal interfaces are provided between the first seal and the second seal.

[0013] In some embodiments of the present application, the outer shell is provided with a connection port matching the water seal interface, and the connection port is connected to the water seal interface through a water pipe.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention can effectively reduce the entry of particles into the cavity between the cover plate and the guard plate by setting short back ribs on the cover plate of the impeller. The centrifugal force brought by the rotation of the impeller also hinders the entry of particles, effectively protecting the flow-through components. The three-stage sealing assembly is also set to prevent the entry of particles, especially by setting the water seal interface between the first seal and the second seal, and pressurizing the water seal with clean water, which can further isolate the slurry from the high-pressure side of the impeller outlet through the cavity at the cover plate to the impeller inlet, thereby extending the service life of the guard plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of a granular medium delivery pump;

[0017] Figure 2 This is a schematic diagram of the particle medium delivery pump;

[0018] Figure 3 It is a schematic diagram of the cross section of the volute and impeller of the particle medium conveying pump;

[0019] Figure 4 Schematic diagram of the impeller structure.

[0020] In the figure:

[0021] Impeller 1, blades 11, cover plate 12, short back ribs 13, pump body 2, outer shell 21, volute 22, rotating shaft 3, bearing assembly 4, guard plate 5, first seal 6, first impeller protrusion 61, first guard plate protrusion 62, second seal 7, second impeller protrusion 71, second guard plate protrusion 72, third seal 8, water seal interface 9. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0026] The existing particle medium delivery pump will cause wear to the flow-through parts because it conveys particle slurry, especially the position between the guard plate 5 and the cover plate 12 of the impeller 1. The traditional method is to set a sealing ring, a wear-resistant ring, etc. between the guard plate 5 and the impeller 1 at the end of the cover plate 12 away from the rotating shaft 3. However, as the running time increases, the particles in the slurry damage the sealing ring or the wear-resistant ring, thereby reducing the effect until it fails, and the wear of the guard plate 5 and the cover plate 12 of the impeller 1 will increase. The single-stage single-suction delivery pump will set the back blade 11 on the impeller 1 to reduce the slurry pressure at the back cover plate 12. Therefore, the number of blades 11 designed is small, the blades 11 are long, the power loss is large, which can reach 5-10%, and the balance is poor.

[0027] The present invention provides a solution for an impeller 1 for a granular medium delivery pump, which can prevent large particles in the slurry from entering the cavity between the guard plate 5 and the cover plate 12, and better delay the erosion and wear of the cover plate 12 and the guard plate 5 of the impeller 1. Specifically, the impeller 1 is a single-stage double-suction impeller 1, including blades 11 and a cover plate 12, and a plurality of short back ribs 13 are arranged at intervals on the outer peripheral side of the cover plate 12 along the rotation direction. The short back ribs 13 can be designed as an integral molding with the cover plate 12 of the impeller 1, or can be installed and fixed one by one by screws.

[0028] In a specific implementation manner, the short back ribs 13 are spaced apart by a distance of 5-10 mm.

[0029] In a specific implementation, the height of the short back ribs 13 is less than or equal to 20 mm, such as 2 mm, 3 mm, 5 mm, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, etc., which is determined according to the size of the gap between the guard plate 5 and the cover plate 12. The added short back ribs 13 have little effect on the power of the impeller 1 and can be ignored. As shown in the figure, the short back ribs 13 can be selected as a diamond block structure, and are installed or set in an adaptive direction according to the rotation direction of the impeller 1, so that the slurry can be thrown out from the gap between the adjacent short back ribs 13.

[0030] In the second aspect, a particle medium delivery pump is provided, comprising a pump body 2, the impeller 1 mentioned above, and a rotating shaft 3 for driving the impeller 1 to rotate; the impeller 1 is connected to the rotating shaft 3, and the two are connected to rotate as a whole, that is, the rotating shaft 3 drives the impeller 1 to rotate; both ends of the rotating shaft 3 are provided with bearing assemblies 4 sleeved on the rotating shaft 3, and the bearing assembly 4 is connected and fixed to the pump body 2; a sealing assembly is provided between the impeller 1 and the pump body 2. The connection between the impeller 1 and the rotating shaft 3 can be fixed by a spline or the like, and the sealing between the impeller 1 and the rotating shaft 3 can be a packing seal or the like. All conventional structures such as connections and seals of the specific delivery pump can adopt any existing commercially available products and technical solutions disclosed in the prior art.

[0031] In a specific implementation, the pump body 2 adopts a double-shell structure, and the parts can be replaced better for the transportation of media such as slurry. The specific pump body 2 includes an outer shell 21 and a volute 22, and the bearing assembly 4 is connected and fixed to the outer shell 21; the impeller 1 is arranged in the volute 22, and the left and right sides of the volute 22 are provided with guard plates 5, and a sealing assembly is provided between the impeller 1 and the guard plates 5. The guard plates 5 include a left guard plate 5 and a right guard plate 5, and one of the guard plates 5 and the volute 22 can be detachably arranged to facilitate the installation of the impeller 1, or both sides are detachable, and the impeller 1 is sealed after it is installed. The sealing method can be a method of connecting bolts with screw holes, and the specific method can adopt or refer to the existing conveying pump related technology.

[0032] In one embodiment, the outer shell 21 includes a front pump shell and a rear pump shell, the front pump shell is communicated with the interior of the rear pump shell to form an installation cavity, and the volute 22, impeller 1 and other units are installed inside the installation cavity, and the two sides of the volute 22, impeller 1 and other units are respectively matched and installed with the corresponding positions of the front pump shell and the rear pump shell through their corresponding positions, and a positioning matching structure can be set, such as a positioning boss and its matching positioning groove.

[0033] The volute 22, the outer shell 21, the guard plate 5 and other components are provided with holes for the shaft 3 to pass through, and any commercially available product or solution disclosed in the prior art may be referred to.

[0034] The volute 22, impeller 1 and other components described in the present application can be made of special materials, such as corrosion-resistant steel, ceramics and other materials, which can effectively improve the wear resistance, corrosion resistance, high temperature resistance and impact resistance of the overall structure, making the delivery pump durable and having a long service life.

[0035] In a specific embodiment, a third seal 8 is provided at the assembly point of the guard plate 5 and the inlet of the impeller 1. The third seal 8 is provided to isolate the inlet of the impeller 1 from the chamber outside the guard plate 5, thereby preventing the slurry from entering the inlet of the guard plate 5 and the impeller 1. The third seal 8 can be a commercially available mouth ring seal.

[0036] In a specific embodiment, a first seal 6 and a second seal 7 are axially arranged between the guard plate 5 and the cover plate 12 of the impeller 1. In a specific feasible sealing method, the guard plate 5 is provided with a first guard plate protrusion 62, and the impeller 1 is provided with a first impeller protrusion 61. The first guard plate protrusion 62 and the first impeller protrusion 61 are both annular structures, and are arranged in cooperation with each other to form the first seal 6; the guard plate 5 is provided with a second guard plate protrusion 72, and the impeller 1 is provided with a second impeller protrusion 71. The second guard plate protrusion 72 and the second impeller protrusion 71 are both annular structures, and are arranged in cooperation with each other to form the second seal 7. As shown in the figure, the figure illustrates that the radius of the first impeller protrusion 61 is smaller than the first guard plate protrusion 62, and the radius of the second impeller protrusion 71 is smaller than the second guard plate protrusion 72. The gap between the first impeller protrusion 61 and the first guard plate protrusion 62, and between the second impeller protrusion 71 and the second guard plate protrusion 72 can be selected to include 0.5mm, 1mm, 2mm, 3mm, 4.5mm, etc., according to the needs of actual application, such as the required design pressure reduction size and other indicators, and the labyrinth pressure reduction principle is applied to set the size of the gap.

[0037] The first seal 6, the second seal 7, and the third seal 8 cooperate with each other to form a combined seal. The guard plate 5 covers from the side, and the inner side of the guard plate 5 and the cover plate 12 of the impeller 1 add two axial seals, which together with the third seal 8 at the inlet of the impeller 1 form a labyrinth three-stage pressure reduction.

[0038] In a specific implementation manner, the guard plates 5 on both sides of the volute 22 are provided with water seal interfaces 9 , and the water seal interfaces 9 are provided between the first sealing member 6 and the second sealing member 7 .

[0039] In a specific embodiment, the outer shell 21 is provided with a connection port matching the water seal interface 9, and the connection port is connected to the water seal interface 9 through a water pipe. An independent clean water delivery pipe is provided to access the connection port, or the connection port is connected to the water seal interface 9, so that the clean water outside can be pressurized into the impeller 1.

[0040] Injecting clean water with a pressure greater than the outlet pressure of the delivery pump between the cover plate 12 of the impeller 1 and the first seal 6 and the second seal 7 of the cavity of the guard plate 5 can effectively isolate the slurry that flows back from the high-pressure side of the impeller 1 outlet through the cavity at the cover plate 12 to the inlet of the impeller 1, greatly extending the service life of the guard plate 5. If the delivery pump is used as a slurry pump, clean water with a pressure of 1.2 times, 1.3 times, etc. of the outlet pressure of the slurry pump can be used for pressure supply.

[0041] The first impeller protrusion 61, the first guard plate protrusion 62, the second impeller protrusion 71, the second guard plate protrusion 72 and the short back rib 13 can be integrally formed with the guard plate 5 or the impeller 1, or fixed by other fixing methods.

[0042] The principle of the technical solution of the present application is as follows: by setting short back ribs 13 at intervals, large particles are isolated from entering the cavity between the guard plate 5 and the cover plate 12. At the same time, due to the gap, when the impeller 1 rotates, the centrifugal force also causes the particles to enter the cavity, reducing the contact and contact time between the particles and the short back ribs 13, thereby avoiding contact with the inner wall of the cavity, thereby reducing erosion and wear and improving the service life. A three-stage labyrinth combined seal is used to form a three-stage pressure reduction. A clean water booster is set between the first and second seals 7 to almost completely isolate the slurry that flows back from the high-pressure side of the impeller 1 outlet through the cavity at the cover plate 12 to the inlet of the impeller 1, thereby extending the service life of the guard plate 5.

[0043] The technical contents or conventional technical contents not explicitly described in the above-mentioned delivery pump may adopt any technical solutions disclosed in the prior art, including contents recorded in commercially available products or literature.

[0044] The components or structural connections of this application are not fully shown in the figure, and they can all be connected using the connection methods in the art. The application does not explicitly state that the application does not limit the use of the prior art. The screws and mounting holes for installation are not fully shown in the figure, and those skilled in the art can set them according to the actual situation of the solution or product.

[0045] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An impeller for a particle medium delivery pump, characterized in that: The impeller comprises blades and a cover plate, and a plurality of short back ribs are arranged at intervals on the outer peripheral side surface of the cover plate along the rotation direction.

2. The impeller for a granular medium delivery pump according to claim 1, characterized in that: The short back ribs are spaced apart by 5-10 mm.

3. The impeller for a granular medium delivery pump according to claim 1, characterized in that: The height of the short back ribs is less than or equal to 20 mm.

4. A particle medium delivery pump, characterized in that: It comprises a pump body, an impeller as described in any one of claims 1 to 3, and a rotating shaft for driving the impeller to rotate; the impeller is connected to the rotating shaft; both ends of the rotating shaft are provided with bearing assemblies sleeved on the rotating shaft, and the bearing assemblies are connected and fixed to the pump body; a sealing assembly is provided between the impeller and the pump body.

5. The granular medium delivery pump according to claim 4, characterized in that: The pump body comprises an outer shell and a volute, and the bearing assembly is connected and fixed to the outer shell; the impeller is arranged in the volute, and guard plates are arranged on the left and right sides of the volute, and a sealing assembly is arranged between the impeller and the guard plates.

6. The granular medium delivery pump according to claim 5, characterized in that: A third sealing member is provided at the assembly point between the guard plate and the impeller inlet.

7. The granular medium delivery pump according to claim 5, characterized in that: A first sealing member and a second sealing member are axially arranged between the guard plate and the cover plate of the impeller.

8. The granular medium delivery pump according to claim 7, characterized in that: The guard plates on both sides of the volute are provided with water seal interfaces, and the water seal interfaces are arranged between the first sealing component and the second sealing component.

9. The granular medium delivery pump according to claim 8, characterized in that: The outer shell is provided with a connection port matching the water seal interface, and the connection port is connected to the water seal interface through a water pipe.

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