High-temperature submerged multi-stage pump flow guide body

Abstract

The invention relates to a high-temperature submerged multistage pump flow guide body which comprises two symmetrical volute type double channels and two separation tongues, and the two separation tongues are fixed to the positions, extending by 3-10 mm, of outlets of the two symmetrical volute type double channels respectively. A plurality of flow guide bodies are connected in series to form a flow guide body group; the lower portion of the flow guide body is fixedly connected with the suction body or the upper-stage flow guide body, and the upper portion of the flow guide body is fixedly connected with the lower-stage flow guide body. The flow guide body is simple in structure and compact in axial size, precision blade design of an existing flow guide body is omitted, long and narrow flow channel design of an existing structure is omitted, casting difficulty is lowered, and the yield of the flow guide body is increased. The friction between the fluid and the flow channel is reduced, the friction loss is reduced, and the hydraulic efficiency is improved. Contact between fluid and a flow passage component under high temperature and corrosion is reduced, corrosion resistance and abrasion and erosion resistance of the flow guide body are effectively improved, and the service life of the flow guide body is prolonged.

Description

Technical Field

[0001] The present invention relates to a diverter body, in particular to a diverter body for a high-temperature submerged multi-stage pump, which has a simple structure, improves the finished product rate of the diverter body, improves the hydraulic efficiency and prolongs the service life of the diverter body. Background Art

[0002] High-temperature submersible multistage pump is a submersible pump immersed in high-temperature medium. It is widely used in chemical industry, solar thermal power generation, molten salt energy storage system and other high-temperature working conditions.

[0003] Since the high-temperature submersible pump operates at a high temperature and the medium is usually corrosive, the reliability and stability of the unit are particularly important, which places high demands on the design and processing of the key flow-through components, the flow guide.

[0004] Most of the existing high-temperature submersible multistage pumps use traditional long-axis submersible pumps, and their guide body structure is as follows: Figure 1 As shown, the blade 2 and the guide vane body 1 are cast as one piece.

[0005] The existing structure has the following defects:

[0006] 1. The structure of the spatial guide body is relatively complex, consisting of several precisely designed blades inside, with narrow flow channels formed between the blades, making its design complex and casting difficult.

[0007] 2. The number of space guide blades is large, which increases the contact area with the fluid, resulting in increased friction loss and lower pump efficiency.

[0008] 3. The space guide body has several precisely designed blades, resulting in poor corrosion resistance and abrasion erosion performance. Summary of the Invention

[0009] In view of the above problems, the main purpose of the present invention is to provide a high-temperature submerged multi-stage pump guide body with a simple structure, improved finished product rate of the guide body, improved hydraulic efficiency, and increased service life of the guide body.

[0010] The present invention solves the above technical problems through the following scheme: a high-temperature submerged multi-stage pump guide body, the high-temperature submerged multi-stage pump guide body comprising: two symmetrical volute double channels, two partition tongues,

[0011] The two partition tongues are respectively fixed at positions extending 3-10 mm from the outlets of the two symmetrical volute-type double channels; a plurality of guide bodies are connected in series to form a guide body group; the lower part of the guide body is fixedly connected to the suction body or the upper-level guide body, and the upper part of the guide body is fixedly connected to the lower-level guide body.

[0012] In a specific embodiment of the present invention, the lower portion of the guide body is fixedly connected to the suction body or the upper-stage guide body by bolts, and the upper portion of the guide body is fixedly connected to the lower-stage guide body by bolts.

[0013] In a specific embodiment of the present invention, two symmetrical volute-type double channels and two partition tongues are cast into one piece by casting.

[0014] In a specific embodiment of the present invention, the fluid enters the impeller through the suction body or the upper stage guide body, enters the lower stage guide body after being pressurized by the impeller, and the partition tongue guides the fluid to smoothly transition from the impeller outlet to the volute double channel.

[0015] In a specific embodiment of the present invention, the high-temperature submerged multi-stage pump guide body adopts two symmetrical volute-type double channels, eliminating the narrow flow channel design and blade design of the existing structure.

[0016] The positive benefits of this invention include: The high-temperature submerged multi-stage pump diverter body proposed in this invention features a relatively simple structure and compact axial dimensions. It eliminates the precision blade design and narrow flow channel design of existing diverter bodies, reducing casting difficulties and improving the diverter body yield rate. It also reduces friction between the fluid and the flow channel, lowering frictional losses and improving hydraulic efficiency. It also minimizes contact between the fluid and flow-through components under high temperature and corrosive conditions, effectively improving the diverter body's resistance to corrosion and abrasion erosion, and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the currently common flow guide body.

[0018] Figure 2 This is a schematic structural diagram of the body guide proposed in the present invention.

[0019] Figure 3 It is a schematic diagram of the installation position of the present invention.

[0020] Figure 4 This is a schematic diagram of the effect of the guide body that commonly uses spatial guide vanes.

[0021] Figure 5 This is a schematic diagram of the effect of the guide body without using spatial guide vanes in the present invention.

[0022] Figure 6 This is a schematic diagram of the axial effect of the currently common spatial guide vane body.

[0023] Figure 7 It is a schematic diagram showing the axial length effect of the present invention.

[0024] The following are the names corresponding to the marks in the present invention:

[0025] Figure 1-7 Middle: guide vane body 100, blade 200, guide body 1, volute double channel 2, partition tongue 3, impeller 4, pump shaft 5, suction body 6. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to illustrate the technical solutions of the present invention in detail.

[0027] The technical problems to be solved by the present invention are as follows:

[0028] 1. The spatial flow guide structure of the high-temperature submersible pump and the multi-stage pump is relatively complex, the design is complex, the casting is difficult, and the product yield is low.

[0029] Solution: A dual-channel volute structure diverter design is adopted. Its design is simple and reliable, eliminating the narrow and long flow channel design of the existing structure, greatly reducing the casting difficulty and improving the yield of the diverter.

[0030] 2. The spatial friction loss of the high-temperature submersible pump and the multi-stage pump is large, and the efficiency of the pump group is low.

[0031] Solution: A dual-channel volute structure guide body design is adopted, and a volute large channel flow path design is adopted. While ensuring the flow rate of the water section, the precision blade design of the existing guide body is cancelled, which reduces the friction between the fluid and the flow path, reduces friction loss, and improves hydraulic efficiency.

[0032] 3. The corrosion resistance and abrasion erosion performance of the high-temperature submersible pump multi-stage pump space are poor.

[0033] Solution: The dual-channel volute structure guide body design is adopted, which cancels the precision blade design of the existing guide body, reduces the contact between the fluid and the flow-through components under high temperature and corrosion, effectively improves the corrosion resistance and abrasion erosion performance of the guide body, and increases the service life of the guide body.

[0034] The following are specific implementation examples: Figure 2 This is a schematic diagram of the structure of the guide body proposed in the present invention. Figure 3 Schematic diagram of the installation position of the present invention, as shown in FIG. Figure 2 and 3As shown: The present invention proposes a high-temperature submersible multi-stage pump guide body, the high-temperature submersible multi-stage pump guide body 1 includes: two symmetrical volute-type dual channels 2, two baffle tongues 3, the two baffle tongues 3 are respectively fixed at positions extending 3-10mm from the outlets of the two symmetrical volute-type dual channels 2; in the specific implementation process, the above parameters select different values ​​or ranges according to specific requirements. The present invention can use multiple guide bodies connected in series to form a guide body group; the lower part of the guide body is fixedly connected to the suction body or the previous level guide body, and the upper part of the guide body is fixedly connected to the next level guide body. In the specific implementation process, the lower part of the guide body is fixedly connected to the suction body 6 or the previous level guide body by bolts, and the upper part of the guide body is fixedly connected to the next level guide body by bolts.

[0035] In a specific implementation process, the two symmetrical volute-type double channels 2 and the two partition tongues 3 of the present invention are cast into one piece by casting.

[0036] The guide body of the present invention is connected to the suction body 6 or the upper level guide body by bolts at the bottom, and is connected to the lower level guide body by bolts at the top. According to different parameters, several guide bodies can be connected in series.

[0037] The fluid of the present invention enters the impeller through the suction body or the upper stage guide body, enters the lower stage guide body after being pressurized by the impeller, and the partition tongue guides the fluid to smoothly transition from the impeller outlet to the volute type double channel 2, thereby reducing flow separation, improving the stability of fluid movement, improving hydraulic efficiency, and reducing vibration and noise.

[0038] Figure 4 This is a schematic diagram of the effect of the guide body with the common spatial guide vanes. Figure 5 This is a schematic diagram of the effect of the guide body without using spatial guide vanes in the present invention. Figure 4 What is shown in the figure are space guide vane blades 200, which are generally more than 6. The more blades 200 there are, the more complicated the casting is and the higher the casting cost is. Figure 5 The figure shows a symmetrical volute with two channels for the guide body of a high-temperature submerged multi-stage pump, with a medium casting complexity.

[0039] Figure 6 This is a schematic diagram of the axial effect of the currently common spatial guide vane body. Figure 7 This is a schematic diagram showing the axial length effect of the present invention. Figure 6 and Figure 7 , Figure 6 It can be seen that the axial size of the space guide vane is larger. Figure 6 The blade size in the space determines that the axial length of the guide vane body should be considerable and cannot be too small; Figure 7 The middle part is a symmetrical double-channel structure of the high-temperature submersible multistage pump, which compresses the axial length, makes the axial size of the high-temperature submersible multistage pump guide body small, occupies less space, is lighter, and has lower casting cost.

[0040] The diverter body of the present invention has a relatively simple overall structure and compact axial dimensions. It eliminates the precise blade design and narrow flow channel design of existing diverter bodies, reducing casting difficulties and improving the diverter body's yield rate. It also reduces friction between the fluid and the flow channel, lowering frictional losses and improving hydraulic efficiency. It also minimizes contact between the fluid and flow-through components under high temperature and corrosive conditions, effectively improving the diverter body's corrosion resistance and abrasion erosion resistance, and extending its service life.

[0041] The basic principles, main features and advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention, which is defined by the appended claims and their equivalents.

Claims

1. A high-temperature submerged multi-stage pump guide body, characterized by: The high-temperature submerged multi-stage pump guide body comprises: two symmetrical volute-type double channels, two baffle tongues, The two partition tongues are respectively fixed at positions extending 3-10 mm from the outlets of the two symmetrical volute-type double channels; a plurality of guide bodies are connected in series to form a guide body group; the lower part of the guide body is fixedly connected to the suction body or the upper-level guide body, and the upper part of the guide body is fixedly connected to the lower-level guide body.

2. The high-temperature submerged multi-stage pump guide body according to claim 1, characterized in that: The lower part of the guide body is fixedly connected with the suction body or the upper-stage guide body by bolts, and the upper part of the guide body is fixedly connected with the lower-stage guide body by bolts.

3. The high-temperature submerged multi-stage pump guide body according to claim 1, characterized in that: Two symmetrical volute-type double channels and two partition tongues are cast into one piece.

4. The high-temperature submerged multi-stage pump guide body according to claim 1, characterized in that: The fluid enters the impeller through the suction body or the upper stage guide body, and enters the lower stage guide body after being pressurized by the impeller. The partition tongue guides the fluid to smoothly transition from the impeller outlet to the volute double channel.

5. The high-temperature submerged multi-stage pump guide body according to claim 1, characterized in that: The high-temperature submerged multi-stage pump guide body adopts two symmetrical volute-type double channels, eliminating the narrow flow channel design and blade design of the existing structure.

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