Wear-resistant and scouring-resistant pump body and using method thereof

Abstract

The invention discloses a wear-resistant and washing-resistant pump body and a using method thereof, and relates to the field of high-speed centrifugal pumps, the wear-resistant and washing-resistant pump body comprises a pump body, the pump body is provided with a fluid inlet channel and a fluid outlet channel, a lining with two open ends is installed in the fluid outlet channel of the pump body, and the inner wall of the lining forms a part of the fluid outlet channel; the bushing is made of a wear-resistant material; the pump body is provided with a gland, the gland is located on the side, away from the fluid inlet channel, of the lining, and the bolt connecting piece penetrates through the gland to be in threaded connection with the pump body. The anti-scouring performance of the fluid channel is improved, and the fluid channel is suitable for conveying fluid containing solid particles.

Description

Technical Field

[0001] The present application relates to a wear-resistant and erosion-resistant pump body and a method of using the same, which belong to the category of flow-through components of high-speed centrifugal pumps. A vertical high-speed centrifugal pump equipped with the wear-resistant and erosion-resistant pump body of the present invention is particularly suitable for conveying fluids containing solid particles. Background Art

[0002] Vertical high-speed centrifugal pumps are driven by ordinary motors through gear speed increasers (or directly by high-speed motors). The impeller is installed at one end of the pump cantilever shaft. The pump cantilever shaft is perpendicular to the pump foot installation plane. The impeller speed is usually greater than 5000rpm. It is particularly suitable for low specific speed conditions with small flow and high head. It is widely used in petroleum, chemical, environmental protection, electric power, steel and other industries.

[0003] Vertical high-speed centrifugal pumps generate work through the rotation of their impellers, increasing the velocity of the working fluid. The stationary pump body then converts this velocity energy into pressure energy, resulting in a higher outlet pressure. When high-velocity, particulate-laden fluids flow through the pump's fluid channels, they can easily cause erosion and wear, impacting the pump's hydraulic performance and operational stability. Summary of the Invention

[0004] The technical problem solved by the present application is to overcome the deficiencies of the prior art, provide a wear-resistant and scour-resistant pump body and a method of using the same, thereby improving the anti-scour performance of the fluid channel and being suitable for conveying fluids containing solid particles.

[0005] The wear-resistant and scour-resistant pump body consists of a pump body, a bushing, a static sealing element, a gland, and bolted connections. The bushing is made of wear-resistant material, and fluid channels are machined into the bushing and pump body. When a high-speed fluid passes through the fluid channel, the fluid velocity gradually decreases and the pressure gradually increases, allowing the pressure-elevated fluid to flow out continuously, achieving fluid transportation. A vertical high-speed centrifugal pump equipped with the wear-resistant and scour-resistant pump body of the present invention has the advantages of high efficiency and energy saving, safety and reliability, and a compact structure, and is particularly suitable for transporting fluids containing solid particles.

[0006] The technical solutions provided in this application are as follows:

[0007] A wear-resistant and erosion-resistant pump body includes a pump body, the pump body is provided with a fluid inlet channel and a fluid outlet channel, a bushing with two ends open is installed in the fluid outlet channel of the pump body, the inner wall of the bushing forms a part of the fluid outlet channel, and the bushing is made of wear-resistant material; the pump body is provided with a pressure cover, the pressure cover is located on the side of the bushing away from the fluid inlet channel, and the bolt connection part is threaded through the pressure cover and connected to the pump body.

[0008] The fluid outlet channel includes an inlet section, a mounting hole and a fixed section which are connected in sequence. The inlet section is connected to the fluid outlet channel. The end of the mounting hole close to the inlet section is the minimum diameter portion of the mounting hole, and the end of the mounting hole close to the fixed section is the maximum diameter portion of the mounting hole. The bushing is installed in the mounting hole. The minimum diameter of the bushing is equal to the diameter of the inlet section, and the diameter of the fixed section is larger than the maximum diameter of the mounting hole, so as to form a mounting surface between the fixed section and the mounting hole. The pump body is provided with a threaded hole on the mounting surface, and the bolt connecting part passes through the gland and is threadedly connected to the threaded hole; the inner diameter of the gland is equal to the inner diameter of the large diameter end of the bushing, and the outer diameter of the gland is larger than the maximum outer diameter of the bushing.

[0009] The inlet section is a cylindrical hole.

[0010] The mounting hole includes a conical section and a cylindrical section, the small diameter end of the conical section is connected to the end of the inlet section, and the cylindrical section is connected to the large diameter end of the conical section, and the diameter of the cylindrical section is larger than the diameter of the large diameter end of the conical section, and a step surface is formed between the conical section and the cylindrical section; the bushing includes a conical portion and a cylindrical portion, one end of the cylindrical portion is provided with a shoulder, the shoulder is coaxially connected to the large diameter end of the conical portion, the outer diameter of the cylindrical portion is larger than the outer diameter of the large diameter end of the conical portion, and the shoulder cooperates with the step surface.

[0011] The pump body is provided with a first sealing groove at the step surface position. The first sealing groove is used to install a first sealing ring. The first sealing ring is pressed against the shoulder to seal between the pump body and the bushing.

[0012] The gland is processed with a second sealing groove, which is opposite to the end of the bushing. A second sealing ring is installed in the second sealing groove, and the second sealing ring is tightly pressed against the end of the bushing to seal between the bushing and the gland.

[0013] The inner wall surface of the inlet section is sprayed with wear-resistant material.

[0014] The wear-resistant material is a ceramic material of silicon carbide or boron carbide.

[0015] It also includes a pump casing, a sealing body, an impeller, an inducer and a pump cantilever shaft. The pump casing is provided with an assembly groove, and the pump body is installed in the assembly groove. The pump casing is provided with an inlet and an outlet, the inlet is connected to the fluid inlet channel of the pump body, and the outlet is connected to the fluid outlet channel of the pump body. The sealing body is provided on the side of the pump body away from the bottom of the assembly groove, and the sealing body is connected to the pump casing; the pump cantilever shaft passes through the center of the sealing body, and a driving member is installed on the side of the sealing body away from the pump casing, and the driving shaft of the driving member is connected to the pump cantilever shaft, and the impeller and inducer are installed on the pump cantilever shaft, and the impeller and inducer are placed in the pump body.

[0016] A method for using a wear-resistant and erosion-resistant pump body, comprising: installing a bushing in a mounting hole of a pump body, installing a gland on the pump body to fix the bushing to the pump body, so that an inner wall surface of the bushing forms a part of a fluid outlet passage;

[0017] The centrifugal pump is started to allow the fluid to enter the fluid inlet channel and pass through the pump body, where the pressure and speed are increased and the fluid flows out from the fluid outlet channel.

[0018] It can be seen from the above technical solutions that the present invention has the following advantages compared with the prior art:

[0019] 1. The pump body bushing is made of wear-resistant and erosion-resistant silicon carbide or boron carbide ceramic material. It is used for conveying fluids containing solid particles. When the fluid passes through the fluid channel of the pump body, it can effectively reduce the erosion and wear of the fluid channel, extend the service life of the pump body, and improve the operating stability of the vertical high-speed centrifugal pump.

[0020] 2. The bushing and pump body are processed with fluid channels, and the smooth transition between the fluid channels can reduce the hydraulic loss caused by flow friction loss and flow separation, and improve hydraulic efficiency.

[0021] 3. The bushing is fixed to the pump body through the gland and bolt connection, which is convenient for disassembly and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an exploded view of a wear-resistant and erosion-resistant pump body model;

[0023] Figure 2 This is a schematic diagram of a wear-resistant and erosion-resistant pump body structure;

[0024] Figure 3 This is a structural diagram of a vertical high-speed centrifugal pump;

[0025] Explanation of the accompanying numbers: 1-pump body, 2-bushing, 3-static sealing element, 4-pressure cover, 5-bolted connection, 6-sealing body, 7-pump casing, 8-impeller, 9-inducer, 10-pump cantilever shaft, 11-sealing body. DETAILED DESCRIPTION

[0026] In order to make the objectives, technical solutions and advantages of this application clearer, the embodiments disclosed in this application will be described in further detail below with reference to the accompanying drawings.

[0027] The embodiment of the present application discloses a wear-resistant and erosion-resistant pump body, such as Figures 1 to 3 As shown, the wear-resistant and erosion-resistant pump body includes a pump body 1, and the pump body 1 is provided with a bushing 2, a static sealing element 3, a gland 4 and a bolt connection 5. The static sealing element 3 includes a first sealing ring and a second sealing ring.

[0028] like Figure 1 and Figure 2 As shown, the pump body 1 is provided with a fluid inlet channel along its axis and a fluid outlet channel tangential to the inner wall of the fluid inlet channel. The fluid outlet channel comprises an inlet section, a mounting hole, and a fixed section, which are sequentially connected. The inlet section is connected to the fluid outlet channel, and its axis is perpendicular to the axis of the fluid outlet channel. The inlet section is a cylindrical hole with the same inner diameter in each section, which facilitates machining and reduces pressure loss. The inner wall of the inlet section is sprayed with a wear-resistant material using laser cladding. The mounting hole comprises a conical section and a cylindrical section. The small diameter end of the conical section is connected to the end of the inlet section, and the diameter of the small diameter end of the conical section is larger than the diameter of the inlet section, forming a mounting step between the conical section and the inlet section. The cylindrical section is connected to the large diameter end of the conical section, and the diameter of the cylindrical section is larger than the diameter of the large diameter end of the conical section, forming a step surface between the conical section and the cylindrical section. The mounting hole is used to install the bushing 2, so that the inner cavity of the bushing 2 forms a fluid outlet channel with the inlet section and the fixed section. The diameter of the fixed section is larger than the diameter of the cylindrical section.

[0029] The bushing 2 consists of a conical portion and a cylindrical portion. One end of the cylindrical portion is provided with a shoulder, which is coaxially connected to the larger diameter end of the conical portion. The outer diameter of the cylindrical portion is larger than that of the larger diameter end of the conical portion, and the shoulder mates with the stepped surface. The pump body 1 is provided with a first sealing groove at the stepped surface location. This first sealing groove is used to accommodate a first sealing ring, which abuts against the shoulder to seal between the pump body 1 and the bushing 2. The diameter of the inlet section is equal to the inner diameter of the smaller diameter end of the cylindrical portion.

[0030] The inner diameter of the gland 4 is equal to the inner diameter of the cylindrical portion, and the outer diameter of the gland 4 is larger than the outer diameter of the cylindrical portion. The gland 4 is installed in the fixed section. The gland 4 is machined with a second sealing groove for installing a second sealing ring and a through hole for installing a bolt connector 5. The pump body 1 is machined with a threaded hole for installing the bolt connector 5. The bolt connector 5 passes through the through hole of the gland 4 and is threadedly connected to the threaded hole of the pump body 1. The second sealing groove is directly opposite the end of the cylindrical portion; the second sealing ring is installed in the second sealing groove and pressed against the cylindrical portion to seal the gland 4 and the cylindrical portion.

[0031] The bushing 2 is made of wear-resistant material, fitted into the mounting hole of the pump body 1, and secured by a gland 4 and bolt connector 5. The bushing 2 and the inlet section of the pump body 1 form a fluid channel, which is generally conical.

[0032] The wear-resistant material of the bushing 2 is generally a wear-resistant and erosion-resistant ceramic material such as silicon carbide or boron carbide.

[0033] The bushing 2 is fitted in a hole machined on the pump body 1 . The fitting hole machined on the pump body 1 may be conical or cylindrical.

[0034] The pump body 1 is processed with threaded holes for the bolt connectors 5, and the threaded holes are evenly distributed. The bushing 2 is fixed to the pump body 1 through the gland 4 and the bolt connector 5, which is convenient for disassembly and assembly and easy for replacement.

[0035] Fluid channels are machined on the bushing 2 and the pump body 1 , and the fluid channels have a smooth transition and are generally conical.

[0036] The static sealing element 3 can be an O-ring or a sealing gasket. The material selection of the static sealing element 3 depends on the corrosive characteristics of the conveyed fluid and plays a sealing role.

[0037] like Figure 3 As shown, a wear-resistant and erosion-resistant pump body and a method of using the same are provided. The flow passage portion of a vertical high-speed centrifugal pump adopts the wear-resistant and erosion-resistant pump body provided by the present invention. Specifically, the vertical high-speed centrifugal pump includes a pump casing 7, a sealing body 11, a pump body 1, an impeller 8, an inducer 9 and a pump cantilever shaft 10. The pump casing 7 is provided with an assembly groove, and the pump body 1 is installed in the assembly groove so that the pump body 1 is installed in the pump casing 7 of the vertical high-speed centrifugal pump; the pump casing 7 is provided with an inlet and an outlet, the inlet is connected to the fluid inlet channel of the pump body 1, and the outlet is connected to the fluid outlet channel of the pump body 1, the sealing body 11 is provided on the side of the pump body 1 away from the bottom of the assembly groove, and the sealing body 11 is connected to the pump casing 7; the pump cantilever shaft 10 passes through the center position of the sealing body 11. A driving component is installed on the side of the sealing body 11 facing away from the pump casing 7. The driving component is a gear speed increaser or a high-speed motor. The driving shaft of the driving component is connected to the pump cantilever shaft 10. The impeller 8 and the inducer 9 are installed on the pump cantilever shaft 10. The impeller 8 and the inducer 9 are placed in the pump body 1.

[0038] When the vertical high-speed centrifugal pump is operating, the pump cantilever shaft 10 drives the impeller 8 and inducer 9 to rotate, drawing fluid in from the pump casing 7 inlet. The fluid is then pumped through the inducer 9 and impeller 8, where its pressure and velocity are increased. As the high-speed fluid passes through the fluid outlet channel of the pump body 1, its velocity gradually decreases and its pressure gradually increases, allowing the pressurized fluid to continuously flow out of the pump casing 7 outlet, achieving fluid delivery.

[0039] The contents not described in detail in this application specification are common knowledge to those skilled in the art.

[0040] The present application has been described in detail above with reference to specific embodiments and exemplary examples. However, these descriptions should not be construed as limiting the present application. Those skilled in the art will appreciate that, without departing from the spirit and scope of the present application, various equivalent substitutions, modifications, or improvements may be made to the technical solutions and implementations of the present application, all of which fall within the scope of the present application. The scope of protection of the present application shall be determined by the appended claims.

Claims

1. A wear-resistant and erosion-resistant pump body, characterized by: The invention comprises a pump body (1), wherein the pump body (1) is provided with a fluid inlet channel and a fluid outlet channel, wherein a bushing (2) with openings at both ends is installed in the fluid outlet channel of the pump body (1), wherein the inner wall of the bushing (2) forms a part of the fluid outlet channel, and the bushing (2) is made of a wear-resistant material; the pump body (1) is provided with a pressure cover (4), wherein the pressure cover (4) is located on a side of the bushing (2) away from the fluid inlet channel, and a bolt connection part (5) passes through the pressure cover (4) and is threadedly connected to the pump body (1).

2. The wear-resistant and erosion-resistant pump body according to claim 1, characterized in that: The fluid outlet channel comprises an inlet section, a mounting hole and a fixed section which are connected in sequence, the inlet section is connected to the fluid outlet channel, the end of the mounting hole close to the inlet section is the minimum diameter portion of the mounting hole, and the end of the mounting hole close to the fixed section is the maximum diameter portion of the mounting hole, the bushing (2) is installed in the mounting hole, the minimum diameter of the bushing (2) is equal to the diameter of the inlet section, the diameter of the fixed section is greater than the maximum diameter of the mounting hole, so as to form a mounting surface between the fixed section and the mounting hole, the pump body (1) is provided with a threaded hole on the mounting surface, the bolt connection part (5) passes through the pressure cover (4) and is threadedly connected to the threaded hole; the inner diameter of the pressure cover (4) is equal to the inner diameter of the large diameter end of the bushing (2), and the outer diameter of the pressure cover (4) is greater than the maximum outer diameter of the bushing (2).

3. The wear-resistant and erosion-resistant pump body according to claim 2, characterized in that: The inlet section is a cylindrical hole.

4. The wear-resistant and erosion-resistant pump body according to claim 2, characterized in that: The mounting hole comprises a conical section and a cylindrical section, the small diameter end of the conical section is connected to the end of the inlet section, the cylindrical section is connected to the large diameter end of the conical section, and the diameter of the cylindrical section is larger than the diameter of the large diameter end of the conical section, and a step surface is formed between the conical section and the cylindrical section; the bushing (2) comprises a conical portion and a cylindrical portion, one end of the cylindrical portion is provided with a shoulder, the shoulder is coaxially connected to the large diameter end of the conical portion, the outer diameter of the cylindrical portion is larger than the outer diameter of the large diameter end of the conical portion, and the shoulder is matched with the step surface.

5. The wear-resistant and erosion-resistant pump body according to claim 4, characterized in that: The pump body (1) is provided with a first sealing groove at the step surface position. The first sealing groove is used to install a first sealing ring. The first sealing ring is pressed against the shoulder to seal between the pump body (1) and the bushing (2).

6. The wear-resistant and erosion-resistant pump body according to claim 2, characterized in that: The gland (4) is machined with a second sealing groove, which is aligned with the end of the bushing (2). A second sealing ring is installed in the second sealing groove, and the second sealing ring is tightly pressed against the end of the bushing (2) to seal the bushing (2) and the gland (4).

7. The wear-resistant and erosion-resistant pump body according to claim 1, characterized in that: The inner wall surface of the inlet section is sprayed with wear-resistant material.

8. The wear-resistant and erosion-resistant pump body according to claim 1, characterized in that: The wear-resistant material is a ceramic material of silicon carbide or boron carbide.

9. The wear-resistant and erosion-resistant pump body according to claim 1, characterized in that: The invention also includes a pump casing (7), an impeller (8), an inducer (9), a pump cantilever shaft (10) and a sealing body (11). The pump casing (7) is provided with an assembly groove, and the pump body (1) is installed in the assembly groove. The pump casing (7) is provided with an inlet and an outlet, the inlet is connected to the fluid inlet channel of the pump body (1), and the outlet is connected to the fluid outlet channel of the pump body (1). The sealing body (11) is arranged on the side of the pump body (1) away from the bottom of the assembly groove, and the sealing body (11) is connected to the pump casing (7); the pump cantilever shaft (10) passes through the center of the sealing body (11), and a driving member is installed on the side of the sealing body (11) away from the pump casing (7). The driving shaft of the driving member is connected to the pump cantilever shaft (10), the impeller (8) and the inducer (9) are installed on the pump cantilever shaft (10), and the impeller (8) and the inducer (9) are placed in the pump body (1).

10. A method for using a wear-resistant and erosion-resistant pump body according to any one of claims 1 to 9, characterized in that: include: Installing the bushing (2) in the mounting hole of the pump body (1), and installing the gland (4) on the pump body (1) to fix the bushing (2) to the pump body (1), so that the inner wall surface of the bushing (2) forms a part of the fluid outlet channel; The centrifugal pump is started to allow the fluid to enter the fluid inlet channel and pass through the pump body (1), whereupon the pressure and speed are increased and the fluid flows out from the fluid outlet channel.

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