Volute structure

Abstract

The utility model relates to the field of pumps, in particular to a volute structure, which comprises a main body section, a first transition section and a second transition section, the first transition section and the second transition section are formed by extending outwards from two ends of the main body section, the tail end of the first transition section is connected with an outlet flow channel, and the tail end of the second transition section is provided with a baffle tongue and is connected with the outlet flow channel through the baffle tongue; the main body section, the first transition section and the second transition section are arc sections, the first transition section is externally tangent to the main body section, and the second transition section is internally tangent to the main body section. According to the utility model, the backflow of high-pressure fluid at the outlet is effectively blocked, the medium conveying loss and the turbulent flow degree of fluid at the outlet of the volute are reduced, and the pump efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of pumps, specifically a volute structure. Background Technology

[0002] A self-priming pump is a type of pump that can automatically draw in and discharge liquid within a short time after startup. Its main characteristic is that it achieves self-priming without the need for an external priming device, and the volute structure is the core component of a self-priming pump. Structurally, self-priming pumps can be divided into horizontal self-priming pumps, vertical self-priming pumps, end-suction self-priming pumps, side-suction self-priming pumps, pipeline self-priming pumps, and deep well self-priming pumps, etc. Among them, the vertical self-priming pump is a vertically placed pump device. Its design features the vertical arrangement of the pump body, impeller, motor, and other main components, offering advantages such as compact structure, small footprint, and convenient installation. The pump's suction and discharge ports are located on the same horizontal line, ensuring smooth liquid flow and reducing hydraulic losses.

[0003] The structure of a traditional vertical self-priming pump, as described in publication number "CN107588008A", features a spiral volute. Before operation, the pump casing must be filled with water. Upon startup, the impeller throws the water out, creating a vacuum at the inlet. After startup, the impeller rotates rapidly, using centrifugal force to push the water towards the volute. During this water-throwing process, a low-pressure area, or vacuum zone, is formed in the impeller channel. Under this vacuum, air from the pipeline is drawn into the pump and, along with the water, is thrown towards the volute by the impeller. The air-water mixture then flows through the impeller channel to the outer edge of the pump and is discharged from the outlet. As the air is expelled, a complete vacuum gradually forms inside the pump, and water begins to be drawn into the pump.

[0004] This traditional spiral volute structure has an unreasonable flow channel design. During use, it cannot effectively reduce the impact of liquid backflow from the high-pressure outlet zone to the low-pressure suction zone. The inlet liquid also generates a lot of turbulence when flowing into the volute, which indirectly affects the pump efficiency of the self-priming pump. Therefore, this problem urgently needs to be solved. Utility Model Content

[0005] To avoid and overcome the technical problems existing in the prior art, this utility model provides a volute structure. This utility model effectively blocks the backflow of high-pressure fluid at the outlet, reduces media transport losses and the degree of fluid turbulence at the volute outlet, and improves pump efficiency.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A volute structure includes a main body section, a first transition section and a second transition section extending outward from both ends of the main body section. The end of the first transition section is connected to an outlet flow channel, and the end of the second transition section is provided with a tongue and connected to the outlet flow channel through the tongue. The main body section, the first transition section and the second transition section are all arc segments. The first transition section is externally tangent to the main body section, and the second transition section is internally tangent to the main body section.

[0008] As a further embodiment of this utility model: the center of the concentric circle of the main body segment is O1, the center of the concentric circle of the first transition segment is O2, and the center of the concentric circle of the second transition segment is O3, and the line connecting O1, O2, and O3 is located on the same straight line.

[0009] As a further embodiment of this utility model: the concentric circle radius of the main body section is R1, the concentric circle radius of the first transition section is R2, and the guide vane outlet placement angle inside the volute is β.

[0010] R2 = R1 + R1 × tanβ.

[0011] As a further improvement of this invention, the placement angle of the outlet flow channel is equal to the placement angle of the guide vane outlet inside the volute.

[0012] As a further embodiment of this utility model: the radius of the concentric circle of the main body section is R1, the radius of the concentric circle of the second transition section is R3; the radius of the guide vane inside the volute is R4, and the outlet angle of the guide vane inside the volute is β.

[0013] R3 = R1 - R4 × tanβ;

[0014] The exit angle of the tongue (14) is equal to the exit angle β of the guide vane.

[0015] As a further improvement of this utility model, both the upper and lower ends of the volute are open, and the openings are connected to the water inlet channel.

[0016] As a further embodiment of this utility model: with the external tangent point between the main body segment and the first transition segment as T1, and with point O1 as the center, a rectangular coordinate system is established. The line connecting O1 and T1 is the y-axis of the rectangular coordinate system, the diameter direction of the main body segment is the x-axis of the rectangular coordinate system, the intersection point of the concentric circle of the main body segment and the outlet flow channel adjacent to the x-axis is n1, and the line connecting O2 and n1 is extended to the concentric circle of the first transition segment and intersects the first transition segment at point A1, which is the end of the first transition segment.

[0017] As a further embodiment of this invention: The point of intimacy between the main body section and the second transition section is T2. The guide vane is arranged coaxially with the main body section. A rectangular coordinate system is established with the radius of the concentric circle S4 of the guide vane as R4 and point O1 as the center. The line connecting O1 and T2 is the y-axis of the rectangular coordinate system, and the diameter direction of the main body section is the x-axis. The intersection of the concentric circle S4 of the guide vane and the x-axis on the adjacent outlet flow channel side is n2. The tangent at point n2 is μ2. A ray W2 is drawn from point n2 towards the adjacent point T2. The angle between W2 and μ2 is equal to the guide vane outlet placement angle. A straight line perpendicular to ray W2 is drawn from point n2, intersecting the y-axis at point O4. The symmetrical point of point O4 about the x-axis is the center O3 of the second transition section. A perpendicular line is drawn from point O3, perpendicular to ray W2. The intersection of this perpendicular line and the concentric circle S2 of the second transition section is point A2. Point A2 is the end of the second transition section.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. The multi-section design of the pump body volute of this utility model reasonably adjusts the placement angle of the outlet flow channel and the position of the tongue, effectively blocking the backflow of high-pressure fluid at the outlet, reducing the loss of medium transportation and the degree of fluid turbulence at the outlet of the volute, and improving pump efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a schematic diagram of the self-priming pump used in this utility model.

[0022] Figure 3 for Figure 2 A schematic diagram of the structure of the guide vane.

[0023] Figure 4 for Figure 2 A schematic diagram of the central water intake chamber.

[0024] Figure 5 This is a performance curve diagram for existing volute-structure pump types.

[0025] Figure 6 This is a performance curve of the volute pump type of the present invention.

[0026] Figure 7 for Figure 1 The positional relationship of point A1 in the middle.

[0027] Figure 8 for Figure 1 The positional relationship of point A2 in the middle.

[0028] In the picture:

[0029] 1. Volute; 11. Main body section; 12. First transition section; 13. Second transition section;

[0030] 14. Tongue separator; 15. Outlet flow channel;

[0031] 2. Water inlet channel; 21. First inlet; 22. Second inlet;

[0032] 3. Guide vane; 31. Impeller; 32. Positioning boss; 33. Guide vane inlet; 34. Flow channel;

[0033] 4. Water intake chamber; 41. Water intake chamber inlet; 42. Water intake chamber outlet; 43. Positioning groove;

[0034] 5. Pump shaft; 6. Motor; 7. Water outlet channel. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] Please see Figures 1-4 In this embodiment of the utility model, a volute structure is provided. The volute 1 includes a main body segment 11, and a first transition segment 12 and a second transition segment 13 extending outward from both ends of the main body segment 11. The end of the first transition segment 12 is connected to an outlet flow channel 15, and the end of the second transition segment 13 is provided with a tongue 14 and is connected to the outlet flow channel 15 through the tongue 14. The main body segment 11, the first transition segment 12 and the second transition segment 13 are all arc segments. The first transition segment 12 is externally tangent to the main body segment 11, and the second transition segment 13 is internally tangent to the main body segment 11.

[0037] With the center of the concentric circle of the main body segment 11 as O1, the center of the concentric circle of the first transition segment 12 as O2, and the center of the concentric circle of the second transition segment 13 as O3, the radius of the guide vane inside the volute 1 is R4, and the outlet angle of the guide vane inside the volute 1 is β; the line connecting O1, O2, and O3 is on the same straight line.

[0038] R2 = R1 + R1 × tanβ;

[0039] R3 = R1 - R4 × tanβ;

[0040] The placement angle of the outlet flow channel 15 is equal to the placement angle of the guide vane outlet inside the volute 1.

[0041] The self-priming pump used in the volute 1 has a pump casing integrally cast and formed, including the volute 1, as well as the water inlet channel 2 and the water outlet channel 7 communicating with the inner cavity of the volute 1. The top of the pump casing is open for the water inlet chamber 4 to be installed. After the water inlet chamber 4 is installed in the pump casing, the opening at the top of the pump casing is closed, and the water inlet chamber 4 is supported and positioned by the volute 1.

[0042] The water intake chamber 4 is hollow, with a water intake chamber inlet 41 radially opened on its side wall and a water intake chamber outlet 42 axially opened on its bottom.

[0043] The inlet channel 2 and the outlet channel 7 are respectively located on both sides of the volute 1. The upper and lower ends of the volute 1 are open to serve as inlets. After the water is diverted, the inlet channel 2 forms a first inlet 21 and a second inlet 22. A portion of the medium in the inlet channel 2 passes through the first inlet 21 and the water intake chamber 4, and then enters the volute 1 through the upper opening. The other portion of the medium in the inlet channel 2 passes through the second inlet 22 and enters the volute 1 through the lower opening.

[0044] A motor 6 is installed at the top of the pump casing, serving as the power source for the pump shaft 5 to rotate. The pump shaft 5 passes vertically through the inlet chamber 4 and enters the guide vane 3 of the volute 1, where it is coaxially fixed with the impeller 31. The diameter of the pump shaft 5 is smaller than the diameter of the outlet 42 of the inlet chamber, forming an annular gap between them for the medium to pass through and enter the volute 1. Guide vane inlets 22 are coaxially provided at both the top and bottom of the guide vane 3, and the flow channel 34 inside the guide vane 3 communicates with the outlet flow channel 15 of the volute 1.

[0045] The outer ring of the water inlet outlet 42 has a multi-step positioning groove 43. The guide vane inlet 22 at the top of the guide vane 3 extends to the outside of the volute 1, and the outer ring has a positioning boss 32 corresponding to the size of the positioning groove 43. The volute 1 is positioned by the positioning boss 32 and the positioning groove 43.

[0046] like Figure 7 As shown, with the external tangent point of the main body segment 11 and the first transition segment 12 as T1, and with point O1 as the center, a rectangular coordinate system is established. The line connecting O1 and T1 is the y-axis of the rectangular coordinate system. Then, the intersection point of the concentric circle S1 of the main body segment 11 and the side of the outlet flow channel 15 adjacent to the x-axis of the rectangular coordinate system is n1. The line connecting O2 and n1 is extended to the concentric circle S2 of the first transition segment 12 and intersects with S2 at point A1. A1 is the end of the first transition segment 12.

[0047] Take the tangent at point n1 as u, and draw a ray W from point n1 toward the adjacent outlet flow channel 15. The angle between W and u is the guide vane outlet placement angle β. Draw a straight line n1O2 with its foot at n1, perpendicular to W. The intersection of n1O2 and the y-axis is O2. With O2 as the center, draw a circle S2, which is tangent to S1 at point T1. The extension of O2N1 intersects at point A1. Extending point A1 will create the outlet flow channel, and the outlet flow channel placement angle is the same as the guide vane outlet placement angle.

[0048] like Figure 8 As shown, with the point of intimacy between the main body section 11 and the second transition section 13 as T2, the guide vane 3 is arranged coaxially with the main body section 11. A rectangular coordinate system is established with the radius of the concentric circle S4 of the guide vane 3 as R4 and point O1 as the center. The line connecting O1 and T2 is the y-axis of the rectangular coordinate system, and the diameter direction of the main body section 11 is the x-axis. The intersection of the concentric circle S4 of the guide vane 3 and the x-axis on one side of the adjacent outlet flow channel 15 is n2. The tangent at point n2 is μ2, and a line is drawn from point n2 towards the adjacent point T2. Ray W2, the angle between W2 and μ2 is equal to the guide vane outlet placement angle; draw a straight line perpendicular to ray W2 from point n2, intersecting the y-axis at point O4, the point symmetrical about the x-axis of point O4 is the center O3 of the second transition segment 13; draw a perpendicular line from point O3 to ray W2, the intersection of the perpendicular line and the concentric circle S2 of the second transition segment 13 is point A2, point A2 is the end of the second transition segment 13, also called the tongue point of tongue 14, the outlet angle of tongue 14 is equal to the guide vane outlet placement angle β.

[0049] The shape of the outlet flow channel 15 between points A1 and A2 is not limited. It can be adapted to different working conditions and can be made into a smooth arc transition.

[0050] As shown in Table 1 below:

[0051] Table 1

[0052]

[0053] Operating data for existing pump models with helical volute structures were measured at different flow percentages. The data are shown in Table 1. Based on the data in Table 1, pump performance curves were plotted. (The curves are shown in the figure.) Figure 5 As shown. Figure 5 In the diagram, the EP curve represents pump efficiency, the H curve represents pump head, and the P2 curve represents pump shaft power. It can be seen that under different operating conditions, the maximum pump efficiency of the existing spiral volute structure pump type is 72.39%.

[0054] As shown in Table 2 below:

[0055] Table 2

[0056]

[0057] The operating data of the pump type with the volute structure of this application were measured under different flow percentages. The data are shown in Table 2. Based on the data in Table 2, the pump type performance curve was plotted. Figure 6 As shown. Figure 6 In the diagram, the EP curve represents the pump efficiency, the H curve represents the pump head, and the P2 curve represents the pump shaft power. It can be seen that under different operating conditions, the maximum pump efficiency of the volute-structured pump type of this application is 81.17%.

[0058] In summary, the maximum pump efficiency of this application is far higher than that of existing spiral volute pumps.

[0059] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0060] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

Claims

1. A volute structure, characterized in that, The volute (1) includes a main body section (11), and also includes a first transition section (12) and a second transition section (13) extending outward from both ends of the main body section (11). The end of the first transition section (12) is connected to an outlet flow channel (15), and the end of the second transition section (13) is provided with a tongue (14) and is connected to the outlet flow channel (15) through the tongue (14). The main body section (11), the first transition section (12) and the second transition section (13) are all arc segments. The first transition section (12) is externally tangent to the main body section (11), and the second transition section (13) is internally tangent to the main body section (11).

2. The volute structure according to claim 1, characterized in that, With the center of the concentric circle of the main segment (11) as O1, the center of the concentric circle of the first transition segment (12) as O2, and the center of the concentric circle of the second transition segment (13) as O3, the lines connecting O1, O2, and O3 are on the same straight line.

3. A volute structure according to claim 2, characterized in that, With the radius of the concentric circle of the main body section (11) as R1, the radius of the concentric circle of the first transition section (12) as R2, and the guide vane outlet placement angle in the volute (1) as β; R2 = R1 + R1 × tanβ.

4. A volute structure according to claim 3, characterized in that, The placement angle of the outlet flow channel (15) is equal to the placement angle of the guide vane outlet inside the volute (1).

5. A volute structure according to any one of claims 2 to 4, characterized in that, With the radius of the concentric circle of the main body section (11) as R1, the radius of the concentric circle of the second transition section (13) as R3; the radius of the guide vane inside the volute (1) as R4, and the outlet angle of the guide vane inside the volute (1) as β; R3 = R1 - R4 × tanβ; The exit angle of the tongue (14) is equal to the exit angle β of the guide vane.

6. A volute structure according to any one of claims 1 to 4, characterized in that, The upper and lower ends of the volute (1) are open, and the openings are connected to the water inlet channel (2).

7. A volute structure according to any one of claims 2 to 4, characterized in that, With T1 as the external tangent point of the main body segment (11) and the first transition segment (12), and with O1 as the center, a rectangular coordinate system is established. The line connecting O1 and T1 is the y-axis of the rectangular coordinate system, and the diameter direction of the main body segment (11) is the x-axis of the rectangular coordinate system. The intersection point of the concentric circle of the main body segment (11) and the x-axis on one side of the adjacent outlet flow channel (15) is n1. The line connecting O2 and n1 is extended to the concentric circle of the first transition segment (12) and intersects with the first transition segment (12) at point A1. A1 is the end of the first transition segment (12).

8. A volute structure according to any one of claims 2 to 4, characterized in that, With the point of intimacy between the main body section (11) and the second transition section (13) as T2, the guide vane (3) is arranged coaxially with the main body section (11). With the radius of the concentric circle S4 of the guide vane (3) as R4, a rectangular coordinate system is established with point O1 as the center. The line connecting O1 and T2 is taken as the y-axis of the rectangular coordinate system, and the diameter direction of the main body section (11) is taken as the x-axis of the rectangular coordinate system. The intersection of the concentric circle S4 of the guide vane (3) and the x-axis on one side of the adjacent outlet flow channel (15) is taken as n2. The tangent is μ2. A ray W2 is drawn from point n2 toward the adjacent point T2. The angle between W2 and μ2 is equal to the guide vane outlet placement angle. A straight line perpendicular to the ray W2 is drawn from point n2 and intersects the y-axis at point O4. The point symmetrical about the x-axis of point O4 is the center O3 of the second transition segment (13). A perpendicular line perpendicular to the ray W2 is drawn from point O3. The intersection of the perpendicular line and the concentric circle S2 of the second transition segment (13) is point A2. Point A2 is the end of the second transition segment (13).

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