CN221628414U - Straight elbow type double suction pump suction chamber - Google Patents
Straight elbow type double suction pump suction chamber Download PDFInfo
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- CN221628414U CN221628414U CN202420157002.0U CN202420157002U CN221628414U CN 221628414 U CN221628414 U CN 221628414U CN 202420157002 U CN202420157002 U CN 202420157002U CN 221628414 U CN221628414 U CN 221628414U
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- suction chamber
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- 230000007704 transition Effects 0.000 claims abstract description 30
- 238000001125 extrusion Methods 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241000202567 Fatsia japonica Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The utility model discloses a suction chamber of a straight elbow type double suction pump, which comprises a pump shell and a double suction pump assembly, wherein the double suction pump assembly comprises a suction chamber, a volute-shaped extrusion chamber and a double suction impeller; the suction chamber is configured to form a straight cone shape at the inlet section of the suction chamber, and the transition section and the head part are elbow-shaped formed by arc lines, so that when the medium sequentially enters the double-suction impeller along the inlet section of the suction chamber, the flow velocity is gradually increased, the flow velocity distribution is uniform, the flow velocity is uniformly reduced, the speed is uniformly reduced, the distribution is uniform, and the hydraulic loss is reduced; the suction chamber is internally provided with a circular arc-shaped impact plate tangent to the outer wall of the extrusion chamber, and the head part is provided with a baffle plate for reducing the impact loss of incoming flow, so that the uniform flow state of the inlet section of the suction chamber and the inlet section of the double suction impeller is realized, and the hydraulic loss is reduced.
Description
Technical Field
The utility model relates to the field of double suction pumps, in particular to a straight elbow type double suction pump suction chamber with a compact structure and uniform flow field.
Background
The horizontal double-suction centrifugal pump can be widely applied to: the water supply system is particularly suitable for water plants, paper plants, power plants, thermal power plants, steel plants, chemical plants, hydraulic engineering, irrigation areas, and the like.
The double suction pump is formed by combining a suction chamber, two back-to-back impellers and an extrusion chamber, and liquid flows into the two impellers from the suction chamber and then flows into the extrusion chamber. The inlet and outlet of the double-suction pump are in the same direction and perpendicular to the pump shaft, which is beneficial to the arrangement and installation of the pump and inlet and outlet pipelines. The device is characterized by large flow and high efficiency; because the impeller structure of the double-suction pump is symmetrical, the axial force is completely counteracted theoretically, the operation is stable, and the reliability is strong; the pump body adopts a middle opening type, which is beneficial to maintenance.
The suction chamber refers to the flow-through portion of the pump inlet flange to the impeller inlet, the function of which is to deflect the flow in the inlet conduit axially. The flow state of the fluid medium in the suction chamber directly affects the flow condition in the impeller, has a great influence on the cavitation performance of the pump and has a certain influence on the efficiency of the pump.
The suction chamber of the existing double suction pump usually adopts a half-spiral suction chamber, the half-spiral suction chamber can enable liquid to flow to generate rotary motion and rotate around a pump shaft, but the lift of the pump is slightly reduced due to pre-rotation of an inlet, hydraulic loss is reduced, the service efficiency of the double suction pump is reduced, and the energy consumption is high.
Therefore, how to effectively improve the structure of the suction chamber of the double suction pump so as to ensure that the inlet flow states of the double suction pump and the impeller are uniform and the hydraulic loss is smaller, thereby improving the efficiency of the pump and saving the energy consumption is a problem to be solved in the field.
Disclosure of utility model
Aiming at the defects of the prior art, the utility model aims to provide a straight-elbow type double-suction pump suction chamber, which can realize that the inlet section of the suction chamber and the inlet section of an impeller are uniform in flow state and reduce hydraulic loss.
In order to achieve the above object, the present utility model provides a straight elbow type double suction pump suction chamber, comprising:
a pump housing;
a double suction pump assembly disposed in the pump housing; and
A suction chamber for sucking the liquid in the suction chamber,
A volute-shaped extrusion chamber;
the double-suction impeller is axially arranged between the suction chamber and the extrusion chamber;
The suction chamber includes:
The flow passage comprises a straight cone-shaped inlet section, a transition section and a head, wherein the transition section and the head are elbow-shaped formed by arc lines, so that the flow area of the inlet section through which a medium passes is uniformly increased, the flow area of the transition section and the head through which the medium passes is uniformly reduced,
An impingement plate arranged in a circular arc shape in cross-section tangential to the outer wall of the extrusion chamber for reducing impingement losses of the medium flowing from the inlet section to the transition section,
A baffle disposed at the head portion so as to reduce impact loss of media flowing from the transition section to the head portion.
Further, the suction chamber comprises a left suction chamber and a right suction chamber, and the left suction chamber and the right suction chamber are symmetrically arranged at two sides of the suction chamber.
Further, no diverter plate is provided in the suction chamber.
Further, the pressing chamber is disposed between the left suction chamber and the right suction chamber.
The straight elbow type double suction pump suction chamber provided by the utility model adopts the suction chamber with the straight conical inlet section to improve the inlet flow state of the medium, so that the flow velocity of the medium entering the suction chamber through the straight conical inlet section is gradually increased, and the velocity distribution is more uniform; meanwhile, the transition section and the head of the suction chamber are smooth elbows, so that the appearance streamline transition is smooth, the speed distribution is ensured to be uniform when a medium enters the double suction impeller, and the hydraulic loss is reduced; meanwhile, the impact plate with the section of an arc shape tangent to the outer wall of the volute of the extrusion chamber and the partition plate arranged at the head of the suction chamber are adopted to reduce the impact loss of incoming flow, so that the uniform flow state of the inlet section of the suction chamber and the inlet section of the double suction impeller is realized, and the hydraulic loss is smaller.
Drawings
The utility model is further described below with reference to the drawings and the detailed description.
FIG. 1 is a schematic diagram of the overall structure of a suction chamber of a straight-elbow double suction pump provided by the utility model;
FIG. 2 is a front cross-sectional view of a suction chamber of the straight elbow type double suction pump provided by the utility model;
FIG. 3 is a top view of the pump body of the present utility model;
FIG. 4 is a side view of the pump body of the present utility model;
FIGS. 5a and 5b are hydraulic schematic views of a suction chamber according to the present utility model;
fig. 6a and 6b are flow charts of the suction chamber of the present utility model.
Reference numerals:
1. A pump housing; 2. a double suction pump assembly; 21. a pump body; 22. a pump cover; 23. mechanical seal flushing pipeline; 24. a bracket; 25. a pump shaft; 26. mechanical sealing; 27. a rotor component; 28. a bearing member;
3. A suction chamber; 301. a left suction chamber; 302. a right suction chamber; 31. an inlet section; 311. an inlet end; 32. a transition section; 321. an impingement plate; 33. a head; 331. a partition plate;
4. Double suction impeller; 5. an extrusion chamber.
Detailed Description
The utility model is further described with reference to the following detailed drawings in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the implementation of the utility model easy to understand.
Referring to fig. 1, an example of a suction chamber of a straight elbow type double suction pump according to the present utility model is shown.
As can be seen from the figure, the straight elbow type double suction pump suction chamber of the present embodiment mainly includes a pump housing 1 and a double suction pump assembly 2, wherein the double suction pump assembly 2 is disposed in the pump housing 1 and includes a pump body 21, a pump cover 22, a mechanical seal flushing pipeline 23, a bracket 25, a pump shaft 25, a mechanical seal 26, a rotor component 27, a bearing component 28, and the like, and the specific construction of the double suction pump assembly 2 and the pump housing 1 is the same as that of the prior art, and is a well known basis for those skilled in the art, and will not be repeated herein.
The pump body 21 comprises a suction chamber 3, a double suction impeller 4 and a volute-shaped extrusion chamber 5, wherein the double suction impeller 4 is axially arranged between the suction chamber 3 and the extrusion chamber 5, so that the medium in the suction chamber 3 can flow into the extrusion chamber 5 through the double suction impeller 4.
Further, the medium enters the double suction impeller 4 sequentially along the inlet section 31, the transition section 32 and the head 33 of the suction chamber 3.
Referring to fig. 2 to 4, in order to make the flow rate of the medium uniform when entering the suction chamber 3, to reduce hydraulic loss of the medium, to improve the operation efficiency of the double suction pump, the inlet section 31 of the suction chamber 3 is configured in a straight cone shape.
The inlet end 311 of the inlet section 31 is tapered and gradually extends and spreads in the direction in which the medium enters the suction chamber 3, so that when the medium enters the inlet section 31 from the inlet end 311, the medium is collected at the tapered inlet end 311, and after entering the inlet section 31, the diffusion is slowly accelerated, thereby making the flow rate of the medium uniform and reducing the loss.
In order to allow the medium to enter the inlet section 31 of the suction chamber 3, after passing through the transition section 32 and the head 33, the flow velocity distribution at the inlet of the double suction impeller 4 is uniform, the transition section 32 and the head 33 being configured as elbows.
The transition section 32 and the head 33 are both connected into an elbow shape by circular arc lines, so that the transition section 32 and the head 33 are internally bent and have smooth and smooth streamline transition, and meanwhile, the sections of the transition section 32 and the head 33 are gradually and uniformly reduced, so that when the medium flows from the inlet section 31 to the transition section 32 and the head 33, the overflow area is uniformly reduced, and the medium uniformly enters the inlet of the double suction impeller 4.
Referring to fig. 5a and 5b, hydraulic diagrams of suction chambers of the straight elbow type double suction pump of the present example are shown.
Further, in order to make the inlet section 31 of the suction chamber 3 and the inlet section of the double suction impeller 4 uniform, the hydraulic loss is small, and the structures of the inlet section 31, the transition section 32 and the head 33 in the suction chamber 3 are exemplified below.
In this example, the inlet section 31 has an inlet diameter ds, the double suction impeller 4 has an inlet diameter d 1, and the hub has a diameter d n, so that the double suction impeller 4 has an inlet area a 1＝(π/4)(d1 2-dn 2).
The inlet section 31 has inlet positions L s and a s, the outer contour of the head 33 of the suction chamber 3 being determined by the radial dimension a 1～a6,
Setting a 1＝(1.5-1.8)r1;a6＝(2.5-2.8)r1; the dimension a 2～a5 increases with increasing circumferential angle epsilon, thus a i＝a1+(a6-a1)ε/180;a7＝(3～3.5)r1, where r 1＝d1-dn;
Thus, the cross section (a-B) = (1.7 to 2.2) d 1 of the head 33.
To ensure a continuous and uniform variation of the velocity of the medium in the suction chamber 3 along the inlet section 31, the transition section 32 and the head 33, the section a-B of the head 33 has to meet the reduction ratio c 1m/cA-B = 1.5-2.2, while the section having the radial dimension a 1～a7 has to meet the velocity of the medium on section a 1～a7 substantially identical to that on section a-B. Therefore, the flow rate of the section M-C (or D-C) is preferably half that of the section A-B so that the flow rate of the medium decreases in proportion to the decrease in the circumferential angle.
Meanwhile, in the inlet section 31 to the transition section 32 (0-0 section to A-B section portion) of the suction chamber 3, the sectional area from the 0-0 section to the A-B section is continuously and uniformly increased gradually, so that the flow area is uniformly increased, the flow speed is reduced, and the along-path resistance loss is reduced; the flow rate is close to each section a 1～a7, so that the medium can uniformly enter the double suction impeller 4, and the hydraulic loss is small.
Thus, the flow area of the suction chamber 3 tends to be uniformly increased and then decreased.
Further, the suction chamber 3 includes the left suction chamber 301 and the right suction chamber 302 which are completely symmetrical, in order to reduce the impact loss of the medium flowing from the inlet section 31 to the transition section 32, a conventional flow dividing plate is not provided between the left suction chamber 301 and the right suction chamber 302, but a circular arc-shaped impact plate 321 tangential to the outer wall of the extrusion chamber 5 is provided at the transition section 32 so that the medium is divided into the left suction chamber 301 and the right suction chamber 302 by the impact plate 321 when flowing from the inlet section 31 of the suction chamber 3 to the transition section 32, and at the same time, the impact loss of the medium flowing into the left suction chamber 301 and the right suction chamber 302 can be reduced because the impact plate 321 takes a circular arc shape.
Meanwhile, as the medium outside the head 33 is folded from the left suction chamber 301 and the right suction chamber 302 on two sides to the middle, opposite rotation movement can occur, the speed is uneven, in order to ensure that the inlet of the double suction impeller 4 has axisymmetric uniform speed fields, the head 33 of the left suction chamber 301 and the head 33 of the right suction chamber 302 are respectively provided with a baffle 331, so that when the medium flows from the transition section 32 to the head 33, the baffle 331 can buffer the medium, effectively stabilize the liquid flow, reduce the impact, and further improve the uniformity of the inlet flow of the double suction impeller 4; preferably, the diaphragm 331 may extend downward to reduce the volume of the pump.
Thus, the suction chamber 3 is formed so that the medium uniformly enters the suction chamber 3 through the straight cone inlet section 31 and uniformly enters the double suction impeller 4 through the elbow-shaped transition section 31 and the head 33, so that the inlet section 31 and the inlet section of the double suction impeller 4 are uniform in flow state, and the hydraulic loss is small, as shown in fig. 6a and 6 b.
The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (4)
1. A straight elbow type double suction pump suction chamber comprising:
A pump housing (1);
A double suction pump assembly (2), the double suction pump assembly (2) being arranged in the pump housing (1); and
A suction chamber (3),
A volute-shaped extrusion chamber (5);
A double suction impeller (4), wherein the double suction impeller (4) is axially arranged between the suction chamber (3) and the extrusion chamber (5),
The suction chamber (3) comprises:
A flow passage comprising a straight cone-shaped inlet section (31), a transition section (32) and a head section (33), wherein the transition section (32) and the head section (33) are elbow-shaped and are formed by circular arc lines, so that the flow area of the medium passing through the inlet section (31) is uniformly increased, the flow area of the medium passing through the transition section (32) and the head section (33) is uniformly reduced,
An impingement plate (321), the impingement plate (321) being configured with a cross-section in the shape of a circular arc tangential to the outer wall of the extrusion chamber (5) for reducing the impact loss of the medium flowing from the inlet section (31) to the transition section (32),
A baffle (331) is provided at the head (33) to reduce impact losses of the medium flowing from the transition section (32) to the head (33).
2. The straight elbow type double suction pump suction chamber according to claim 1, wherein the suction chamber (3) comprises a left suction chamber (301) and a right suction chamber (302), and the left suction chamber (301) and the right suction chamber (302) are symmetrically arranged at two sides of the suction chamber (3).
3. The straight-elbow double suction pump suction chamber according to claim 1, characterized in that no diverter plate is provided in the suction chamber (3).
4. The straight elbow type double suction pump suction chamber according to claim 2, wherein the extrusion chamber (5) is arranged between the left suction chamber (301) and the right suction chamber (302).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420157002.0U CN221628414U (en) | 2024-01-23 | 2024-01-23 | Straight elbow type double suction pump suction chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420157002.0U CN221628414U (en) | 2024-01-23 | 2024-01-23 | Straight elbow type double suction pump suction chamber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221628414U true CN221628414U (en) | 2024-08-30 |
Family
ID=92483998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202420157002.0U Active CN221628414U (en) | 2024-01-23 | 2024-01-23 | Straight elbow type double suction pump suction chamber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221628414U (en) |
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2024
- 2024-01-23 CN CN202420157002.0U patent/CN221628414U/en active Active
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