A new type of guard plate for slurry pump and its production process

Abstract

The present invention relates to the technical field of slurry pumps, and discloses a new type of slurry pump guard plate, comprising a body and a suction port opened in the middle of the body, the body comprising a suction port ring located in the middle and a flow side located at the periphery of the suction port ring and facing an impeller, the flow side comprising a base part and a plurality of first wear-resistant bodies, and a side of the first wear-resistant body close to the impeller is in the same plane as the base part. The present invention can prolong the service life.

Description

Technical Field

[0001] The invention relates to the technical field of slurry pumps, and in particular to a new type of guard plate for slurry pumps and a production process thereof. Background Art

[0002] Slurry pump refers to a kind of machine that increases the energy of solid-liquid mixed medium by the action of centrifugal force (rotation of the pump impeller), and converts electrical energy into kinetic energy and potential energy of the medium. It is mainly applicable to industries such as mining, power plants, dredging, metallurgy, chemical industry, building materials and petroleum. Under the action of centrifugal force, the liquid is thrown from the center of the impeller to the outer edge and gains energy, leaving the outer edge of the impeller at high speed and entering the volute pump casing; in the volute pump casing, the liquid slows down due to the gradual expansion of the flow channel, and part of the kinetic energy is converted into static pressure energy, and finally flows into the discharge pipe at a higher pressure and is sent to the required place. When the liquid flows from the center of the impeller to the outer edge, a certain vacuum is formed in the center of the impeller. Since the pressure above the liquid surface in the storage tank is greater than the pressure at the pump inlet, the liquid is continuously pressed into the impeller.

[0003] The impeller is one of the core components of the slurry pump, and its main function is to be connected to the outside of the pump casing so that the pump casing forms a complete shell; there is a suction port in the middle of the front guard plate for water to pass through and enter the pump casing; there is a certain gap between the front guard plate and the impeller, and water will also flow into the gap or space, and as the impeller rotates, the water flow in this gap or space will also be driven by the driving force, so that most of the water flows back to the suction port, and a small part is centrifuged out. However, no matter which form it is, the side of the arc plate close to the impeller will be affected by the water flow in the process. Due to the harsh working environment of the slurry pump, it is easy to cause wear on this side of the arc plate, which shortens the service life of the arc plate and even the pump. Summary of the invention

[0004] The purpose of the invention is to provide a new type of guard plate for a slurry pump, aiming to solve the problem of short service life.

[0005] The above technical purpose of the present invention is achieved through the following technical scheme: it includes a main body and a suction port opened in the middle of the main body, the main body includes a suction port ring located in the middle and a flow side located at the periphery of the suction port ring and facing an impeller, the flow side includes a base part and a plurality of first wear-resistant bodies, and the side of the first wear-resistant body close to the impeller is in the same plane as the base part.

[0006] The present invention is further configured as follows: the first wear-resistant body is one or more of a triangle, a cuboid, a pentagonal prism, a hexagonal prism, an I-shape, a TU-shape, a W-shape, and a waist drum-shape, and the first wear-resistant body is evenly or unevenly distributed on the flow side.

[0007] The present invention is further configured as follows: the first wear-resistant body is distributed on the periphery of the suction port ring.

[0008] The present invention is further configured as follows: the first wear-resistant body is in the shape of an elongated strip, and the first wear-resistant body is evenly distributed on the periphery of the suction port ring in a divergent shape.

[0009] The present invention is further configured as follows: a set distance is provided between the end of the first wear-resistant body away from the suction port ring and the outer edge of the flow-through side.

[0010] The present invention is further configured as follows: the flow side also includes a plurality of second wear-resistant bodies distributed at intervals, the second wear-resistant bodies are located at the edge of the flow side, and there is a set interval between the first wear-resistant body and the second wear-resistant body, and the side of the second wear-resistant body close to the impeller is in the same plane as the side of the first wear-resistant body close to the impeller.

[0011] The present invention is further configured as follows: a side of the second wear-resistant body facing away from the suction port ring is inclined.

[0012] The present invention is further configured as follows: the side of the second wear-resistant body connected to the base part is convex, concave or wavy, and the cross-section of the second wear-resistant body is polygonal, prismatic or elliptical.

[0013] The present invention is further configured as follows: the depth of the second wear-resistant body on the flow side is greater than the depth of the first wear-resistant body on the flow side, and the second wear-resistant body is evenly distributed on the edge of the base portion.

[0014] The present invention also discloses a method for producing a new type of guard plate for a slurry pump as described in any one of the above items, comprising the following steps:

[0015] S1, firing a first wear-resistant body, and then placing the fired first wear-resistant body on a mold;

[0016] S2, pouring the casting material in a fluid state into the mold to form a guard plate prototype;

[0017] S3, high temperature nitriding and sintering are performed to form an integrated body, and the first wear-resistant body is compounded into a part of the guard plate.

[0018] The beneficial effect of the present invention is that during operation, the water flows mainly through the main body (i.e., the suction ring) through the suction port, and then enters the impeller. When a part of the water is between the impeller and the main body, and this part of the water is subjected to the force of the impeller and generates relative movement with the main body, since the movement acts on the flow side, and at the same time, there is a first wear-resistant body on the flow side, and the first wear-resistant body has stronger wear resistance than the material of the main body, so the first wear-resistant body enables the main body to resist the wear of particles or other impurities in the water flow, thereby protecting the main body and extending its service life; wherein in this scheme, the first wear-resistant body is preferably a reaction sintered material, and other wear-resistant materials can also be selected according to actual conditions. Not only that, since the side of the first wear-resistant body close to the impeller is on the same plane as the flow side, when the main body is working, firstly, it can not generate other additional resistance to the water flow, and secondly, it can also well prevent the water flow from acting on the first wear-resistant body, which also protects the first wear-resistant body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a structural schematic diagram of an embodiment of a new type of guard plate for a slurry pump according to the present invention;

[0021] In the figure, 1, suction port; 2, suction port ring; 3, flow side; 3a, base portion; 3b, first wear-resistant body; 4, second wear-resistant body. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings and specific embodiments. 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] Example 1

[0024] A new type of guard plate for slurry pumps, such as Figure 1As shown (the form in the attached figure is only for illustration, and in actual production and use, the number, position and shape of the first wear-resistant body 3b and the second wear-resistant body 4 are consistent with the text part, not just one form in the schematic diagram), including a body and a suction port 1 opened in the middle of the body, the body includes a suction port ring 2 located in the middle (the material of which can be reaction-sintered silicon carbide, recrystallized silicon carbide, boron carbide composite ceramics, atmospheric silicon carbide, pressureless silicon carbide, zirconium oxide, etc., or other materials with good wear resistance) and a flow side 3 located at the periphery of the suction port ring 2 and facing an impeller, the flow side 3 includes a base 3a and a plurality of first wear-resistant bodies 3b, and the side of the first wear-resistant body 3b close to the impeller is in the same plane as the base 3a. The base 3a and the first wear-resistant body 3b can be either integrally sintered or formed separately and then composited.

[0025] The first wear-resistant body 3b is in one or more of the following shapes: triangle, cuboid, pentagonal prism, hexagonal prism, I-shaped, earth-shaped, king-shaped, and waist drum. The first wear-resistant body is evenly or unevenly distributed on the flow side. Of course, in actual use, the first wear-resistant body 3b can also be made into other required shapes and structures according to actual conditions. Its main function is to improve wear resistance. It should be considered as a solution with a wear-resistant part, which is within the scope of protection required by this application, such as irregular shape, cylindrical or elliptical. The first wear-resistant body 3b is distributed on the periphery of the suction port ring 2. The first wear-resistant body 3b is in the shape of a long strip, and the first wear-resistant body 3b is evenly distributed on the periphery of the suction port ring 2 in a divergent shape; at the same time, it should be understood that other distribution shapes are also within the protection scope of this application, such as random distribution, array distribution, or dense and sparse random distribution, which are also the protection schemes required by this application.

[0026] There is a set distance between the end of the first wear-resistant body 3b away from the suction ring 2 and the outer edge of the flow side 3. The flow side 3 also includes a plurality of second wear-resistant bodies 4 distributed at intervals, the second wear-resistant bodies 4 are located at the edge of the flow side 3, and there is a set interval between the first wear-resistant body 3b and the second wear-resistant body 4, and the side of the second wear-resistant body 4 close to the impeller is in the same plane as the side of the first wear-resistant body 3b close to the impeller. The side of the second wear-resistant body 4 facing away from the suction ring 2 is inclined, wherein the angle of inclination is preferably 5-10° (it can also be selected as other usable angles according to actual conditions), and its main function is to be suitable for the guard plate to be better compounded with the pump casing when it is subsequently assembled into a slurry pump.

[0027] Meanwhile, the shape of the second wear-resistant body 4 is not fixed to a certain shape, but can be various shapes, such as a right-angled trapezoid, or an irregular shape in the base portion 3a, and an inclined shape outside the base portion 3a.

[0028] The side of the second wear-resistant body 4 connected to the base portion 3b is convex, concave or wavy, and the cross-section of the second wear-resistant body 4 is polygonal, prismatic or elliptical. Its edge can also be made into other shapes according to actual conditions. The advantage is that it can increase the contact area with the base portion 3a, thereby increasing the composite strength, and the second wear-resistant body 4 and the base portion 3a are connected in a buckled form, thereby further improving the composite strength between the second wear-resistant body 4 and the base portion 3a and extending the service life of the guard plate. The depth of the second wear-resistant body 4 on the flow side 3 is greater than the depth of the first wear-resistant body 3b on the flow side 3. The second wear-resistant body 4 is evenly distributed on the edge of the base portion 3a.

[0029] Moreover, one side of the second wear-resistant body 4 (the side located on the outside) must be consistent with the angle of the edge of the base part 3a, preferably 93°, 95°, 100°, etc. However, if the angle of the edge of the base part 3a changes, the angle of the outer side of the second wear-resistant body 4 will also change accordingly.

[0030] Among them, the first wear-resistant body 3b and the second wear-resistant body 4 can be used alone or in combination according to actual conditions. And the material of the first wear-resistant body 3b and the second wear-resistant body 4 can be the same material, or different materials, or both are a combination of multiple materials; and the material in this application is preferably silicon carbide composite ceramic, not limited to silicon carbide composite ceramic, silicon nitride combined with silicon carbide ceramic, alumina ceramic, reaction sintered ceramic, etc. According to actual conditions, materials that meet the use requirements of this application are within the protection scope required by this application.

[0031] Moreover, the arrangement of the first wear-resistant body 3b and the second wear-resistant body 4 can also be adaptively changed or modified according to actual conditions. It can be arranged evenly as shown in the attached figure, or it can be arranged unevenly, spaced or randomly, or even fully, all within the protection scope required by this application.

[0032] The present invention also provides a method for producing a new type of guard plate for a slurry pump as described in any one of the above items, comprising the following steps:

[0033] S1, firing the first wear-resistant body 3b, and then placing the fired first wear-resistant body 3b on a mold;

[0034] S2, pouring the casting material in a fluid state into the mold to form a guard plate prototype;

[0035] S3, high temperature nitriding sintering is performed to form an integrated body, and the first wear-resistant body 3b is composited into a part of the guard plate.

[0036] Also arranged on the mold is a second wear-resistant body 4 .

[0037] The present invention provides a new type of protective plate for a slurry pump. During operation, water flows mainly through the suction port 1 through the main body (i.e., the suction port ring 2) and then enters the impeller. When a portion of water is between the impeller and the main body and this portion of water is subjected to the force of the impeller and generates relative movement with the main body, since the movement acts on the flow side 3, and at the same time, the flow side 3 has a first wear-resistant body 3b, which has stronger wear resistance than the material of the main body. Therefore, the first wear-resistant body 3b enables the main body to resist the wear of particles or other impurities in the water flow, thereby protecting the main body and extending its service life. In this scheme, the first wear-resistant body 3b is preferably a reaction sintered material, and other wear-resistant materials can also be selected according to actual conditions. Moreover, since the side of the first wear-resistant body 3b close to the impeller is on the same plane as the flow side 3, when the main body is working, firstly, it can not generate other additional resistance to the water flow, and secondly, it can also effectively prevent the water flow from acting on the first wear-resistant body 3b, thereby protecting the first wear-resistant body 3b.

[0038] The first wear-resistant body 3b is rectangular and distributed in a divergent manner around the periphery of the suction port ring 2, so it can evenly and comprehensively protect the flow side 3; at the same time, at the edge of the flow side 3, there are a plurality of second wear-resistant bodies 4 (preferably reaction sintered materials, and other structures can also be selected according to actual conditions; at the same time, the first wear-resistant body 3b and the second wear-resistant body 4 are preferably sintered into one with other structures of the main body), so the second wear-resistant body 4 can also protect the edge of the flow side 3; since the second wear-resistant body 4 is smaller, it can be more dispersed to protect the flow side 3, and the protection effect is better, and the edge of the flow side 3 is also a relatively fragile place, so the best protection is given to the most fragile place, so that the protection effect is the best. There is a gap between the first wear-resistant body 3b and the second wear-resistant body 4, and the gap between the first wear-resistant body 3b and the second wear-resistant body 4 is filled with other materials of the main body. In actual production, it is difficult for the first wear-resistant body 3b and the second wear-resistant body 4 to be fired into one body, but the material of the main body can be sintered into one body with the first wear-resistant body 3b and the second wear-resistant body 4 at the same time, thereby ensuring the overall structural integrity and structural strength of the guard plate.

[0039] The flow side 3 is located on the side facing the impeller and is subject to wear. The side adjacent to the side, i.e., the outer edge of the arc plate, is also prone to wear. At the same time, the edge of the second wear-resistant body 4 is also a part of the edge of the guard plate, so the second wear-resistant body 4 also protects the periphery of the body, making the protection range wider and more comprehensive. The depth of the second wear-resistant body 4 on the flow side 3 is greater than that of the first wear-resistant body 3b (as can be clearly seen from Figure 3). First, only one side of the outer surface of the first wear-resistant body 3b plays a wear-resistant role. Therefore, making the first wear-resistant body 3b too thick (and the depth is also greater) does not improve the actual wear resistance. Therefore, it is better to make the first wear-resistant body 3b thinner, which can save costs; and the second wear-resistant body 4 is made thicker (greater depth) to protect the edge of the body, making the protection more comprehensive.

[0040] Embodiment 2

[0041] The difference from the first embodiment is that the first wear-resistant bodies 3b are hexagonal and are distributed more evenly and densely.

[0042] In yet another embodiment, the first wear-resistant bodies 3b are hexagonal, but are not evenly and densely distributed, but randomly distributed.

[0043] In another embodiment, the first wear-resistant body 3b is hexagonal, but a part of it is distributed in a ring shape (coaxial with the suction buckle 2), and the other part is distributed separately and between the rings formed by the first wear-resistant body 3b.

[0044] In another embodiment, the first wear-resistant bodies 3b are cylindrical, and the first wear-resistant bodies 3b are distributed relatively evenly and densely.

[0045] In yet another embodiment, the first wear-resistant bodies 3b are cylindrical, but are not evenly and densely distributed, but randomly distributed.

[0046] In another embodiment, the first wear-resistant body 3b is cylindrical, but a portion is distributed in an annular shape (coaxial with the suction buckle 2), and the other portion is distributed separately and between the annular shapes formed by the first wear-resistant body 3b.

[0047] In yet another embodiment, the first wear-resistant bodies 3b are in the shape of rectangular parallelepiped, but are not evenly and densely distributed, but randomly distributed.

[0048] In another embodiment, the first wear-resistant body 3b and the second wear-resistant body 4 are both irregularly shaped, and their portions can be either regular or random.

[0049] It should also be understood that the structures claimed for protection in this application are not limited to the several types in the drawings and the above description.

[0050] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0051] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A new type of guard plate for a slurry pump, characterized by: The invention comprises a main body and a suction port (1) opened in the middle of the main body, the main body comprises a suction port ring (2) located in the middle and a flow side (3) located at the periphery of the suction port ring (2) and facing an impeller, the flow side (3) comprises a base part (3a) and a plurality of first wear-resistant bodies (3b), and the side of the first wear-resistant body (3b) close to the impeller is in the same plane as the base part (3a).

2. A new type of guard plate for a slurry pump according to claim 1, characterized in that: The first wear-resistant body (3b) is in one or more of the following shapes: a triangle, a cuboid, a pentagonal prism, a hexagonal prism, an I-shape, a TU-shape, a W-shape, and a waist drum shape. The first wear-resistant body (3b) is evenly or unevenly distributed on the flow side (3).

3. A new type of guard plate for a slurry pump according to claim 2, characterized in that: The first wear-resistant body (3b) is distributed on the periphery of the suction port ring (2).

4. A new type of guard plate for a slurry pump according to claim 3, characterized in that: The first wear-resistant body (3b) is in the shape of an elongated strip, and the first wear-resistant body (3b) is evenly distributed on the periphery of the suction port ring (2) in a divergent manner.

5. The novel guard plate for a slurry pump according to claim 2 is characterized by: There is a set distance between the end of the first wear-resistant body (3b) away from the suction port ring (2) and the outer edge of the flow side (3).

6. The novel guard plate for a slurry pump according to claim 3 is characterized by: The flow side (3) further comprises a plurality of second wear-resistant bodies (4) distributed at intervals, wherein the second wear-resistant bodies (4) are located at the edge of the flow side (3), and there is a set interval between the first wear-resistant body (3b) and the second wear-resistant body (4), and the side of the second wear-resistant body (4) close to the impeller and the side of the first wear-resistant body (3b) close to the impeller are in the same plane.

7. A new type of guard plate for a slurry pump according to claim 6, characterized in that: The side of the second wear-resistant body (4) facing away from the suction port ring (2) is inclined.

8. The novel guard plate for a slurry pump according to claim 7 is characterized by: The side of the second wear-resistant body (4) connected to the base part (3a) is convex, concave or wavy, and the cross-section of the second wear-resistant body (4) is polygonal, prism or elliptical.

9. The novel guard plate for a slurry pump according to claim 6 is characterized by: The depth of the second wear-resistant body (4) on the flow side (3) is greater than the depth of the first wear-resistant body (3b) on the flow side (3), and the second wear-resistant body (4) is evenly distributed on the edge of the base portion (3b).

10. A supply for producing a new type of guard plate for a slurry pump as claimed in any one of claims 1 to 9, characterized in that: The following steps are included: S1, firing a first wear-resistant body (3b), and then placing the fired first wear-resistant body (3b) on a mold; S2, pouring the casting material in a fluid state into the mold to form a guard plate prototype; S3, high temperature nitriding and sintering are performed to form an integrated body, and the first wear-resistant body (3b) is compounded into a part of the guard plate.

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