Wear-resistant and scouring-resistant diffuser and using method thereof

Abstract

The invention discloses a wear-resistant and scouring-resistant diffuser and a using method thereof, and relates to the field of centrifugal pumps. The wear-resistant and scouring-resistant diffuser comprises a diffuser body, and a fluid channel is formed in one side of the diffuser body; the rear partition plate is installed on the side, provided with the spiral line type fluid channel, of the diffuser. The wear-resisting guide vane is installed at the inlet position of the fluid channel of the diffuser, a groove is formed in the side, deviating from the axis of the diffuser, of the wear-resisting guide vane, and the diffuser, the wear-resisting guide vane and the rear partition plate are matched to form a spiral line type flow channel for fluid to pass through; and the wear-resistant guide vane is made of a wear-resistant material. And the wear resistance and the scouring resistance of the diffuser are improved.

Description

Technical Field

[0001] The present application belongs to the technical field of centrifugal pumps, and specifically relates to a wear-resistant and erosion-resistant diffuser. A centrifugal pump equipped with the wear-resistant and erosion-resistant diffuser of the present invention is particularly suitable for conveying fluids containing solid particles. Background Art

[0002] 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 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] Centrifugal pumps generate work through the rotation of their impellers, increasing the velocity of the working fluid. This velocity energy is then converted into pressure energy through the stationary diffuser, resulting in a higher outlet pressure. When high-velocity, particulate-laden fluid passes through the diffuser's fluid channel, it can easily cause erosion and wear at the channel's inlet, 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 erosion-resistant diffuser and a method of using the same, and improve the wear and erosion resistance of the diffuser.

[0005] The technical solutions provided in this application are as follows:

[0006] A wear-resistant and erosion-resistant diffuser, comprising:

[0007] A diffuser is provided with a fluid channel on one side;

[0008] A rear baffle is installed on a side of the diffuser where the spiral fluid channel is provided;

[0009] The wear-resistant guide vane is installed at the inlet of the fluid channel of the diffuser, and a groove is provided on the side of the wear-resistant guide vane away from the diffuser axis. The diffuser, the wear-resistant guide vane and the rear baffle cooperate to form a spiral flow channel for the fluid to pass through; the wear-resistant guide vane is made of wear-resistant material.

[0010] Furthermore, both ends of the wear-resistant guide vane are embedded in the diffuser and the rear baffle.

[0011] Furthermore, the wear-resistant guide vane is an integrally formed structure, and the wear-resistant guide vane includes a guide block and two fixed blocks, the two fixed blocks are respectively connected to the two ends of the guide block as a whole, and the fixed block protrudes from the guide block along the radial direction of the diffuser and away from the axial direction of the diffuser, so that a groove is formed between the fixed block and the guide block; the diffuser and the rear partition are both provided with an installation groove, and the fixed block is clamped in the installation groove.

[0012] Furthermore, along the circumferential direction of the diffuser and on the inlet side of the fluid channel, the fixing block protrudes from the guide block.

[0013] Furthermore, the diffuser has an internal structure on the inner side of a fluid channel and an external structure on the outer side of the fluid channel; the guide block has an arc surface on the side facing the diffuser axis and the internal structure has an arc surface on the side facing the diffuser axis, and the guide block is connected to the internal structure, and the guide block has an arc surface on the side facing away from the diffuser axis and the internal structure has an arc surface on the side facing away from the diffuser axis.

[0014] Furthermore, the projection of the fixing block along the axis of the diffuser is a non-circular shape.

[0015] Furthermore, the wear-resistant material is a ceramic material such as silicon carbide or boron carbide.

[0016] A method for using a wear-resistant and erosion-resistant diffuser according to any of the above-mentioned methods comprises:

[0017] An installation chamber is provided in the middle of the diffuser, which is connected to the inlet of the fluid channel. An impeller is rotatably provided in the installation chamber of the diffuser. One end of the impeller's rotating shaft extends out of the diffuser and is connected to an inducer, and the other end of the impeller's rotating shaft extends out of the rear partition and is connected to the pump cantilever shaft; an inducer jacket is fixedly connected to the side of the diffuser facing away from the rear partition, the inducer is located in the through hole of the inducer jacket, and the external flange of the inducer jacket is fixed to the pump casing of the centrifugal pump through a bolt connection.

[0018] Furthermore, when the centrifugal pump is working, the pump cantilever shaft drives the impeller and inducer to rotate, sucking the fluid from the inducer outer casing. After passing through the inducer and impeller, the pressure and speed are increased to obtain high-speed fluid; the high-speed fluid passes through the fluid channel formed by the diffuser, wear-resistant guide vanes and rear baffle, and finally flows out from the fluid channel.

[0019] The wear-resistant and scour-resistant diffuser is composed of a diffuser, wear-resistant guide vanes and a rear baffle. The diffuser and the rear baffle are respectively processed with mounting grooves for fitting the wear-resistant guide vanes. The wear-resistant guide vanes are made of wear-resistant materials. The diffuser and the wear-resistant guide vanes are simultaneously processed with helical-shaped fluid channels. The diffuser, the wear-resistant guide vanes and the rear baffle are installed in conjunction to form a continuous fluid channel. When the centrifugal pump is working, the pump cantilever shaft drives the impeller and the inducer to rotate, sucking the fluid from the inlet, and the pressure and speed are increased after passing through the inducer and the impeller. When the high-speed fluid passes through the fluid channel of the wear-resistant and scour-resistant diffuser, the wear-resistant guide vanes located at the inlet of the fluid channel can effectively resist the scouring of the high-speed fluid. Thereafter, the fluid speed gradually decreases and the pressure can gradually increase. The fluid after the pressure increase can continuously flow out of the fluid channel to realize the transportation of the fluid. The centrifugal pump equipped with the wear-resistant and scour-resistant diffuser of the present invention is particularly suitable for the transportation of large-flow fluids containing solid particles.

[0020] It can be seen from the above technical solutions that the present invention has the following advantages compared with the prior art:

[0021] 1. The wear-resistant guide vanes are made of wear-resistant and erosion-resistant silicon carbide or boron carbide ceramic materials. They are used for conveying large-flow fluids containing solid particles. When high-speed fluid passes through the diffuser fluid channel, they can effectively resist the erosion of high-speed fluid, extend the service life of the diffuser, and improve the operating stability of the centrifugal pump.

[0022] 2. The bushing and pump body are processed with fluid channels. The diffuser, wear-resistant guide vanes and rear baffle are installed together to form a continuous fluid channel. The smooth transition between the fluid channels can reduce the hydraulic loss caused by flow friction loss and flow separation, and improve hydraulic efficiency.

[0023] 3. The wear-resistant guide vanes are embedded between the diffuser and the rear partition, which is convenient for disassembly and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of a wear-resistant and erosion-resistant diffuser;

[0025] Figure 2 This is an exploded view of a wear-resistant and erosion-resistant diffuser model;

[0026] Figure 3 A schematic diagram of the diffuser structure of a wear-resistant and erosion-resistant diffuser;

[0027] Figure 4 Schematic diagram of the wear-resistant guide vane structure;

[0028] Figure 5 Schematic diagram of the rear partition structure;

[0029] Figure 6 Schematic diagram of the installation structure of wear-resistant guide vanes;

[0030] Figure 7 Schematic diagram of the wear-resistant guide vane structure installed on the rear partition.

[0031] Explanation of the accompanying reference numerals: 1-diffuser, 2-wear-resistant guide vane; 3-rear baffle, 4-fluid channel, 5-impeller, 6-inducer, 7-inducer jacket, 8-bolt connection, 9-mounting slot;

[0032] 21-guide block; 22-fixed block; 23-groove. DETAILED DESCRIPTION

[0033] 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.

[0034] The embodiment of the present application discloses a wear-resistant and erosion-resistant diffuser, such as Figure 1 and Figure 2 As shown, the wear-resistant and erosion-resistant diffuser consists of a diffuser 1, wear-resistant guide vanes 2, and a rear baffle 3. The diffuser 1 and the rear baffle 3 are each machined with mounting grooves 9 for mounting the wear-resistant guide vanes 2. The wear-resistant guide vanes 2 are made of wear-resistant material. The diffuser 1 is machined with a helical-shaped fluid channel 4. The wear-resistant guide vanes 2 are installed at the inlet of the fluid channel 4 of the diffuser 1. The side of the wear-resistant guide vanes 2 facing away from the axis of the diffuser 1 is provided with a groove. The diffuser 1, wear-resistant guide vanes 2, and the rear baffle 3 are installed together to form a continuous fluid channel 4.

[0035] like Figure 3 、 Figure 4 and Figure 5 As shown, the wear-resistant guide vane 2 is an integrally formed structure. The wear-resistant guide vane 2 includes a guide block 21 and two fixed blocks 22. The two fixed blocks 22 are integrally connected to the two ends of the guide block 21, and the fixed block protrudes from the guide block along the radial direction of the diffuser 1 and away from the axial direction of the diffuser 1, so that a groove is formed between the fixed block and the guide block; along the circumferential direction of the diffuser 1 and on the inlet side of the fluid channel 4, the fixed block protrudes from the guide block, so that the inlet position can be wear-resistant on both sides along the axial direction of the diffuser 1; the diffuser 1 and the rear partition 3 are both provided with a mounting groove 9, and the fixed block is clamped in the mounting groove 9 to realize the embedded connection of the wear-resistant guide vane 2.

[0036] like Figure 6 and Figure 7 As shown, the diffuser 1 has an internal structure on the inside of a fluid channel 4, and an external structure on the outside of the channel. The guide block, facing the axis of the diffuser 1, shares a common arc surface with the internal structure. Furthermore, the guide block is connected to the internal structure, and the guide block, facing away from the axis of the diffuser 1, shares a common arc surface with the internal structure. This guide block structure ensures the formation of a spiral flow channel.

[0037] The wear-resistant guide vanes 2 are made of wear-resistant materials, generally wear-resistant and erosion-resistant ceramic materials such as silicon carbide or boron carbide.

[0038] The diffuser 1 and the wear-resistant guide vanes 2 are simultaneously processed with helical-shaped fluid channels 4. The number of the fluid channels 4 is generally 2 to 3 and is evenly distributed in the circumferential direction.

[0039] The diffuser 1 , the wear-resistant guide vanes 2 , and the rear baffle 3 are assembled together to form a continuous fluid channel 4 , and the fluid channels 4 have a smooth transition.

[0040] The wear-resistant guide vanes 2 are embedded between the diffuser 1 and the rear baffle 3, which is convenient for disassembly and replacement.

[0041] The wear-resistant guide vanes 2 are installed at the inlet of the fluid channel 4 of the diffuser 1. The fluid velocity is highest and fluid scouring is most severe at the inlet of the fluid channel 4 of the diffuser 1. Installing the wear-resistant guide vanes 2 at the inlet of the fluid channel 4 of the diffuser 1 can maximize the wear and scouring resistance.

[0042] In the present invention, Figures 1 and 2 A wear-resistant and scour-resistant diffuser and its use method are shown. Using the wear-resistant and scour-resistant diffuser provided by the present invention, an impeller 5 is positioned between the diffuser 1 and the rear baffle 3 of the wear-resistant and scour-resistant diffuser. An inducer 6 is mounted at the front end of the impeller 5. An inducer housing 7 is secured to the diffuser 1 via bolted connectors 8. A through-hole for receiving the inducer 6 is machined in the inducer housing 7, serving as a fluid inlet. The assembled wear-resistant and scour-resistant diffuser is secured within the pump casing of a centrifugal pump via bolted connectors 8. When the centrifugal pump is operating, the pump's cantilever shaft drives the impeller 5 and inducer 6 to rotate, drawing fluid in through the inlet. After passing through the inducer 6 and impeller 5, the fluid's pressure and velocity are increased. When high-speed fluid passes through the fluid channel 4 of the wear-resistant and scour-resistant diffuser, the wear-resistant guide vanes 2 at the inlet of the fluid channel 4 effectively resist scour by the high-speed fluid. The fluid velocity then gradually decreases, while the pressure gradually increases. The pressure-enhanced fluid can then flow continuously out of the fluid channel 4, achieving fluid transport.

[0043] The contents not described in detail in this application specification are common knowledge to those skilled in the art.

[0044] 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 diffuser, characterized in that: include: A diffuser (1) is provided with a fluid channel (4) on one side; A rear baffle (3) is installed on a side of the diffuser (1) where the spiral fluid passage (4) is provided; The wear-resistant guide vane (2) is installed at the inlet position of the fluid channel (4) of the diffuser (1), and a groove (23) is provided on the side of the wear-resistant guide vane (2) away from the axis of the diffuser (1). The diffuser (1), the wear-resistant guide vane (2), and the rear baffle (3) cooperate to form a spiral flow channel for the fluid to pass through; the wear-resistant guide vane (2) is made of wear-resistant material.

2. The wear-resistant and erosion-resistant diffuser according to claim 1, characterized in that: Both ends of the wear-resistant guide vane (2) are embedded in the diffuser (1) and the rear baffle (3).

3. The wear-resistant and erosion-resistant diffuser according to claim 1, characterized in that: The wear-resistant guide vane (2) is an integrally formed structure. The wear-resistant guide vane (2) comprises a guide block (21) and two fixed blocks (22). The two fixed blocks (22) are integrally connected to the two ends of the guide block (21). The fixed blocks (22) protrude from the guide block along the radial direction of the diffuser (1) and away from the axial direction of the diffuser (1), so that a groove is formed between the fixed block and the guide block. The diffuser (1) and the rear partition (3) are both provided with mounting grooves (9), and the fixed blocks are clamped in the mounting grooves (9).

4. The wear-resistant and erosion-resistant diffuser according to claim 3, characterized in that: Along the circumferential direction of the diffuser (1) and on the inlet side of the fluid channel (4), the fixing block protrudes from the guide block.

5. The wear-resistant and erosion-resistant diffuser according to claim 3, characterized in that: The diffuser (1) has an internal structure on the inner side of a fluid channel (4), and an external structure on the outer side of the fluid channel (4); a guide block facing the axis of the diffuser (1) and a side of the internal structure facing the axis of the diffuser (1) share a common arc surface, and the guide block is connected to the internal structure, and a guide block facing away from the axis of the diffuser (1) and a side of the internal structure facing away from the axis of the diffuser (1) share a common arc surface.

6. The wear-resistant and erosion-resistant diffuser according to claim 3, characterized in that: The projection of the fixing block along the axis of the diffuser (1) is a non-circular shape.

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

8. The method for using a wear-resistant and erosion-resistant diffuser according to any one of claims 1 to 7, characterized in that: include: A mounting chamber is provided in the middle of the diffuser (1), the mounting chamber being communicated with the inlet of the fluid channel (4). An impeller (5) is rotatably provided in the mounting chamber of the diffuser (1), one end of the rotating shaft of the impeller (5) extending out of the diffuser (1) and connected to an inducer (6), and the other end of the rotating shaft of the impeller (5) extending out of the rear baffle (3) and connected to the cantilever shaft of the pump; an inducer outer sleeve (7) is fixedly connected to the side of the diffuser (1) facing away from the rear baffle (3), the inducer (6) is located in a through hole of the inducer outer sleeve (7), and the outer flange of the inducer outer sleeve (7) is fixedly mounted in the pump casing of the centrifugal pump via a bolt connection (8).

9. The method for using the wear-resistant and erosion-resistant diffuser according to claim 8, characterized in that: When the centrifugal pump is working, the pump cantilever shaft drives the impeller (5) and the inducer (6) to rotate, sucking the fluid from the inducer jacket (7). After passing through the inducer (6) and the impeller (5), the pressure and speed are increased, thereby obtaining high-speed fluid; The high-speed fluid passes through the fluid channel (4) formed by the diffuser (1), the wear-resistant guide vanes (2) and the rear baffle (3), and finally flows out from the fluid channel (4).

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