Vertical self-priming pump

Abstract

The invention relates to the field of pumps, in particular to a vertical self-priming pump which comprises a volute coaxially arranged in a pump shell, the volute comprises a main body section and further comprises a first transition section and a second transition section which are formed by extending outwards from the two ends of the main body section, the tail end of the first transition section is connected with an outlet flow channel, and a partition tongue is arranged at the tail end of the second transition section. The outlet runner is connected with the outlet runner 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. Backflow of high-pressure fluid at the outlet is effectively blocked, medium conveying loss and the degree of fluid turbulent flow at the outlet of the volute are reduced, and the pump efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of pumps, in particular to a vertical self-priming pump. Background Art

[0002] A self-priming pump, also known as a self-priming centrifugal pump, is a type of pump that can automatically absorb and discharge liquid within a short period of time after starting. Its main feature is that it can achieve self-priming function without an external water diversion device. Structurally, self-priming pumps can be divided into bedroom self-priming pumps, vertical self-priming pumps, end-suction self-priming pumps, side-suction self-priming pumps, pipeline self-priming pumps, deep well self-priming pumps, etc. Among them, the vertical self-priming pump is a vertically placed pump equipment. Its design feature is that the main components such as the pump body, impeller, and motor are arranged vertically, with the advantages of compact structure, small footprint, and easy installation. The suction port and discharge port of the pump are located on the same horizontal line, which makes the liquid flow smoothly and reduces hydraulic losses.

[0003] The structure of a traditional vertical self-priming pump is described in the publication number "CN107588008A". Its volute structure is spiral. Before working, the pump casing must be filled with water. The impeller can throw out the water when starting, thereby creating a vacuum at the inlet. After starting, the impeller rotates rapidly and uses centrifugal force to push the water toward the volute. In the process of throwing water, the impeller forms a low-pressure area, that is, a vacuum area, in the impeller channel. Under the action of the vacuum, the air in the pipeline is drawn into the pump and thrown toward the volute together with the water by the impeller. The mixture of air and water then flows to the outer edge of the pump through the impeller channel and is discharged from the outlet. As the air is discharged, a complete vacuum gradually forms inside the pump, and water begins to be sucked into the pump.

[0004] The flow channel design of this traditional spiral volute structure is not reasonable. During use, it cannot effectively reduce the impact of liquid reflux from the outlet high-pressure area to the suction low-pressure area. The inlet liquid will also generate a lot of turbulence when flowing into the volute, which indirectly affects the pump efficiency of the self-priming pump, so it needs to be solved urgently. Summary of the invention

[0005] In order to avoid and overcome the technical problems existing in the prior art, the present invention provides a vertical self-priming pump, which effectively blocks the backflow of the high-pressure fluid at the outlet, reduces the medium transmission loss and the degree of fluid turbulence at the outlet of the volute, and improves the pump efficiency.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A vertical self-priming pump, comprising a volute coaxially arranged in a pump casing, the volute comprising a main body section, and also comprising a first transition section and a second transition section extending outwardly from both ends of the main body section, the end of the first transition section is connected to an outlet flow channel, the end of the second transition section is provided with a partition tongue, and is connected to the outlet flow channel through the partition tongue; the main body section, the first transition section and the second transition section are all arc sections, the first transition section is arranged circumferentially with the main body section, and the second transition section is arranged inwardly with the main body section;

[0008] The pump casing is provided with a first inlet chamber located at the upper layer of the volute and a second inlet chamber located at the lower layer of the volute. The top and bottom of the volute are opened so as to be connected with the first water inlet chamber and the second water inlet chamber respectively. The outlet flow channel of the volute is connected with the water outlet flow channel of the pump casing. The guide vane is coaxially arranged in the volute, and the pump shaft is coaxially fixed with the impeller in the guide vane after axially passing through the first water inlet chamber or the second water inlet chamber.

[0009] As a further solution of the present invention: a water inlet chamber is arranged in the first inlet cavity of the pump casing, and the water inlet flow channel of the pump casing is split to form a first inlet and a second inlet. The first inlet is connected to the top opening of the volute through the water inlet chamber, and the second inlet is connected to the bottom opening of the volute.

[0010] As a further solution of the present invention: the water diversion chamber, the pump shaft and the guide vane are coaxially arranged, the water diversion chamber is radially provided with a water diversion chamber inlet connected with the first inlet, the bottom of the water diversion chamber is axially provided with a water diversion chamber outlet, and the water diversion chamber outlet is connected with the top opening of the volute; the pump shaft passes through the water diversion chamber into the volute, and there is an annular gap between the pump shaft and the water diversion chamber outlet for the medium to pass through.

[0011] As a further solution of the present invention: the top and bottom of the guide vane are coaxially provided with guide vane water inlets, the outer ring of the guide vane water inlet at the top of the guide vane is provided with a stepped positioning boss, the outer ring of the water diversion chamber outlet is provided with a positioning groove, the guide vane is positioned by plugging and fitting the positioning boss with the positioning groove of the water diversion chamber; the guide channel inside the guide vane is connected with the outlet flow channel of the volute.

[0012] As a further solution of the present invention: the center of the concentric circles of the main section is O1, the center of the concentric circles of the first transition section is O2, the center of the concentric circles of the second transition section is O3, and the lines connecting O1, O2, and O3 are located on the same straight line.

[0013] As a further solution of the present invention: the radius of the concentric circle of the main body section is R1, the radius of the concentric circle of the first transition section is R2, and the guide vane outlet placement angle in the volute is β;

[0014] R2=R1+R1×tanβ;

[0015] The placement angle of the outlet flow channel is equal to the placement angle of the guide vane outlet in the volute.

[0016] As a further solution of the present invention: the concentric circle radius of the main body section is R1, the concentric circle radius of the second transition section is R3; the guide vane radius in the volute is R4, and the guide vane outlet placement angle in the volute is β;

[0017] R3=R1-R4×tanβ;

[0018] The outlet angle of the partition tongue is equal to the guide vane outlet placement angle β.

[0019] As a further solution of the present invention: the tangent point of the main section and the first transition section is T1, and a rectangular coordinate system is established with point O1 as the center of the circle. The line connecting O1 and T1 is used as the y-axis of the rectangular coordinate system, the diameter direction of the main section is used as the x-axis of the rectangular coordinate system, and the intersection point of the concentric circle of the main section and the side of the outlet flow channel adjacent to the x-axis is n1. The line connecting O2 and n1 is extended to the concentric circle of the first transition section and intersects with the first transition section at point A1. A1 is the end of the first transition section.

[0020] As a further solution of the present invention: the intangent point of the main section and the second transition section is T2, the guide vane is coaxially arranged with the main section, the radius of the concentric circle S4 of the guide vane is R4, a rectangular coordinate system is established with point O1 as the center, the line connecting O1 and T2 is used as the y-axis of the rectangular coordinate system, the diameter direction of the main section is used as the x-axis of the rectangular coordinate system, and the intersection point of the concentric circle S4 of the guide vane and one side of the outlet flow channel adjacent to the x-axis is n2; the tangent line of point n2 is μ2, and a ray W2 is made from point n2 to the adjacent point T2, and the angle between W2 and μ2 is equal to the guide vane outlet placement angle; a straight line perpendicular to the ray W2 is made from point n2 and intersects with the y-axis at point O4, and the symmetrical point of point O4 about the x-axis is the center O3 of the second transition section; a perpendicular line perpendicular to the ray W2 is made from point O3, and the intersection point of the perpendicular line and the concentric circle S2 of the second transition section is point A2, and point A2 is the end of the second transition section.

[0021] As a further solution of the present invention: the volute, the water inlet flow channel and the water outlet flow channel are integrally cast to form a pump casing; the top of the pump casing is open, and a motor is arranged at the opening as a power source for the pump shaft.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The multi-stage design of the volute of the pump body of the present invention reasonably adjusts the placement angle of the outlet flow channel and the position of the baffle, effectively blocks the backflow of the outlet high-pressure fluid, reduces the medium transmission loss and the degree of fluid turbulence at the outlet of the volute, and improves the pump efficiency.

[0024] 2. The pump body of the present invention is integrally cast and has an opening at the top. During installation, moving parts such as the impeller and guide vanes can be directly inserted from the opening at the top of the pump body and then pulled out during maintenance, which greatly improves the efficiency of disassembly and assembly of the pump body, reduces the number of connectors in the pump body and improves the overall strength.

[0025] 3. The water diversion chamber of the present invention and the guide vane in the volute are positioned and matched through the step surface plug-in, which reduces the number of connectors and reduces the connection cost. There is no lining plate design during connection, which reduces the lining plate installation time and eliminates the possibility of lining plate loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] Figure 2 It is a cross-sectional view of the volute in the present invention.

[0028] Figure 3 It is a schematic diagram of the structure of the guide vane in the present invention.

[0029] Figure 4 It is a structural schematic diagram of the water diversion chamber in the present invention.

[0030] Figure 5 It is the pump performance curve diagram of the existing volute structure pump type.

[0031] Figure 6 It is a pump performance curve diagram of the volute pump type of the present invention.

[0032] Figure 7 for Figure 2 Position relationship diagram of point A1.

[0033] Figure 8 for Figure 2 Position relationship diagram of point A2.

[0034] In the figure:

[0035] 1. volute; 11. main section; 12. first transition section; 13. second transition section;

[0036] 14. Spacer tongue; 15. Exit flow channel;

[0037] 2. water inlet channel; 21. first inlet; 22. second inlet;

[0038] 3. Guide vane; 31. Impeller; 32. Positioning boss; 33. Guide vane water inlet; 34. Diversion channel;

[0039] 4. Water diversion chamber; 41. Water diversion chamber entrance; 42. Water diversion chamber exit; 43. Positioning groove;

[0040] 5. Pump shaft; 6. Motor; 7. Water outlet channel. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] See also Figures 1 to 4 In an embodiment of the present invention, a vertical self-priming pump is provided, wherein the pump casing of the self-priming pump is integrally cast and includes a volute 1, and a water inlet channel 2 and a water outlet channel 7 connected to the inner cavity of the volute 1. The top of the pump casing is open for a water diversion chamber 4 to be installed. After the water diversion chamber 4 is installed in the pump casing, the top opening of the pump casing is closed, and the water diversion chamber 4 is supported and positioned by the volute 1.

[0043] The water diversion chamber 4 is hollow, and a water diversion chamber inlet 41 is radially opened on its side wall, and a water diversion chamber outlet 42 is axially opened on its bottom.

[0044] The water inlet channel 2 and the water outlet channel 7 are respectively arranged on both sides of the volute 1. The upper and lower ends of the volute 1 are opened as inlets. The water inlet channel 2 is divided to form a first inlet 21 and a second inlet 22. A part of the medium in the water inlet channel 2 passes through the first inlet 21 and the water diversion chamber 4 and enters the volute 1 from the upper end opening of the volute 1. Another part of the medium in the water inlet channel 2 passes through the second inlet 22 and enters the volute 1 from the lower end opening of the volute 1.

[0045] A motor 6 is provided at the top of the pump casing, and the motor 6 serves as a power source for the pump shaft 5 to drive the pump shaft 5 to rotate. After the pump shaft 5 passes through the water diversion chamber 4 in the vertical direction, it enters the guide vane 3 of the volute 1 and is coaxially fixed with the impeller 31 in the guide vane 3. The diameter of the pump shaft 5 is smaller than the diameter of the outlet 42 of the water diversion chamber, and an annular gap is formed between the two for the medium to pass through and enter the volute 1. The top and bottom of the guide vane 3 are coaxially provided with a guide vane water inlet 22, and the guide channel 34 inside the guide vane 3 is connected to the outlet flow channel 15 of the volute 1.

[0046] The outer circle of the water diversion chamber outlet 42 is provided with a multi-step stepped positioning groove 43, the guide vane water inlet 22 at the top of the guide vane 3 extends to the outside of the volute 1, and the outer circle is provided with a positioning boss 32 corresponding to the size of the positioning groove 43, and the volute 1 is positioned by the positioning boss 32 and the positioning groove 43.

[0047] 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 partition tongue 14, and is connected to the outlet flow channel 15 through the partition tongue 14; the main body section 11, the first transition section 12 and the second transition section 13 are all arc sections, the first transition section 12 is arranged circumferentially with the main body section 11, and the second transition section 13 is arranged inwardly with the main body section 11.

[0048] The center of the concentric circle of the main section 11 is O1, the center of the concentric circle of the first transition section 12 is O2, the center of the concentric circle of the second transition section 13 is O3, the radius of the guide vane in the volute 1 is R4, and the guide vane outlet placement angle in the volute 1 is β; the connecting line of O1, O2, and O3 is located on the same straight line.

[0049] R2=R1+R1×tanβ;

[0050] R3=R1-R4×tanβ;

[0051] The placement angle of the outlet flow channel 15 is equal to the placement angle of the guide vane outlet in the volute 1 .

[0052] like Figure 7 As shown, the tangent point of the main section 11 and the first transition section 12 is T1, and a rectangular coordinate system is established with point O1 as the center. The line connecting O1 and T1 is used as the y-axis of the rectangular coordinate system. The intersection point of the concentric circle S1 of the main section 11 and the side of the outlet flow channel 15 adjacent to the x-axis of the rectangular coordinate system is n1. The connecting line of O2 and n1 is extended to the concentric circle S2 of the first transition section 12 and intersects S2 at point A1. A1 is the end of the first transition section 12.

[0053] Take the tangent line at point n1 as u, and make a ray W from point n1 to the direction of the adjacent outlet flow channel 15. The angle between W and u is the guide vane outlet installation angle β. Make a straight line n1O2 with its foot at n1 and perpendicular to W. At this time, the intersection of n1O2 and the y-axis is O2. With O2 as the center, make a circle S2 inscribed in S1 at point T1. At this time, the extended line of O2N1 intersects at point A1. The outlet flow channel can be made by extending point A1, and the outlet flow channel installation angle is the same as the guide vane outlet installation angle.

[0054] like Figure 8As shown, the intangent point of the main section 11 and the second transition section 13 is T2, the guide vane 3 is coaxially arranged with the main section 11, the radius of the concentric circle S4 of the guide vane 3 is R4, and a rectangular coordinate system is established with point O1 as the center. The line connecting O1 and T2 is used as the y-axis of the rectangular coordinate system, the diameter direction of the main section 11 is used as the x-axis of the rectangular coordinate system, and the intersection point of the concentric circle S4 of the guide vane 3 and the side of the outlet flow channel 15 adjacent to the x-axis is n2; the tangent line of point n2 is μ2, and a line is drawn from point n2 to the adjacent point T2. Ray W2, the angle between W2 and μ2 is equal to the guide vane outlet placement angle; a straight line perpendicular to the W2 ray from point n2 intersects the y-axis at point O4, and the symmetrical point of point O4 about the x-axis is the center O3 of the second transition section 13; a vertical line perpendicular to the W2 ray from point O3, the intersection of the vertical line and the concentric circle S2 of the second transition section 13 is point A2, and point A2 is the end of the second transition section 13, also known as the partition point of the partition 14, and the outlet angle of the partition 14 is equal to the guide vane outlet placement angle β.

[0055] There is no excessive limitation on the shape of the outlet flow channel 15 between points A1 and A2. Adaptive changes can be made to different working conditions to achieve an arc-shaped smooth transition.

[0056] As shown in Table 1 below:

[0057] Table 1

[0058]

[0059] The working data of the existing spiral volute structure pump type under different flow percentages are measured. The data are recorded in Table 1. The pump type performance curve is drawn according to the data in Table 1. The curve is as follows: Figure 5 shown. Figure 5 In the figure, 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 working conditions, the maximum pump efficiency of the existing spiral volute structure pump is 72.39%.

[0060] As shown in Table 2 below:

[0061] Table 2

[0062]

[0063] The working data of the pump type of the volute structure of the present application under different flow percentages are measured. The data are recorded in Table 2. The pump type performance curve is drawn according to the data in Table 2. The curve is as follows: Figure 6 shown. Figure 6 In the figure, 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 working conditions, the maximum pump efficiency of the pump type with the volute structure of the present application is 81.17%.

[0064] It can be seen from the above that the maximum pump efficiency of the present application is much higher than that of the existing spiral volute pump type.

[0065] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0066] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

Claims

1. A vertical self-priming pump, characterized in that: The pump comprises a volute (1) coaxially arranged in a pump casing, the volute (1) comprising a main body section (11), and also comprising a first transition section (12) and a second transition section (13) extending outwardly 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 partition tongue (14) and connected to the outlet flow channel (15) via the partition tongue (14); the main body section (11), the first transition section (12) and the second transition section (13) are all arc sections, the first transition section (12) is arranged to be circumscribed with the main body section (11), and the second transition section (13) is arranged to be circumscribed with the main body section (11); A first inlet chamber located at the upper layer of the volute (1) and a second inlet chamber located at the lower layer of the volute (1) are arranged in the pump casing; the top and bottom of the volute (1) are both opened so as to be communicated with the first water inlet chamber and the second water inlet chamber respectively; the outlet flow channel (15) of the volute (1) is communicated with the outlet flow channel (7) of the pump casing; the guide vane (3) is coaxially arranged in the volute (1); the pump shaft (5) passes through the first water inlet chamber or the second water inlet chamber in the axial direction and is coaxially fixed with the impeller (31) in the guide vane (3).

2. A vertical self-priming pump according to claim 1, characterized in that: The water inlet chamber (4) is arranged in the first inlet chamber of the pump casing, and the water inlet channel (2) of the pump casing is split to form a first inlet (21) and a second inlet (22), the first inlet (21) is connected to the top opening of the volute (1) through the water inlet chamber (4), and the second inlet (22) is connected to the bottom opening of the volute (1).

3. A vertical self-priming pump according to claim 2, characterized in that: The water diversion chamber (4), the pump shaft (5) and the guide vane (3) are coaxially arranged; the water diversion chamber (4) is provided with a water diversion chamber inlet (41) in radial direction and connected with the first inlet (21); the bottom of the water diversion chamber (4) is provided with a water diversion chamber outlet (42) in axial direction; the water diversion chamber outlet (42) is connected with the top opening of the volute (1); the pump shaft (5) passes through the water diversion chamber (4) and enters the volute (1); an annular gap exists between the pump shaft (5) and the water diversion chamber outlet (42) for medium to pass through.

4. A vertical self-priming pump according to claim 3, characterized in that: The top and bottom of the guide vane (3) are coaxially provided with a guide vane water inlet (33); the outer ring of the guide vane water inlet (33) at the top of the guide vane (3) is provided with a stepped positioning boss (32); the outer ring of the water diversion chamber outlet (42) is provided with a positioning groove (43); the guide vane (3) is positioned by plugging and matching the positioning boss (32) with the positioning groove (43) of the water diversion chamber (4); and the guide channel (34) inside the guide vane (3) is connected to the outlet flow channel (15) of the volute (1).

5. A vertical self-priming pump according to any one of claims 1 to 4, characterized in that: The center of the concentric circle of the main section (11) is O1, the center of the concentric circle of the first transition section (12) is O2, the center of the concentric circle of the second transition section (13) is O3, and the connecting lines of O1, O2, and O3 are located on the same straight line.

6. A vertical self-priming pump according to claim 5, characterized in that: The radius of the concentric circle of the main body section (11) is R1, the radius of the concentric circle of the first transition section (12) is R2, and the guide vane outlet placement angle in the volute (1) is β; R2=R1+R1×tanβ; The placement angle of the outlet flow channel (15) is equal to the placement angle of the guide vane outlet in the volute (1).

7. A vertical self-priming pump according to claim 5, characterized in that: The concentric circle radius of the main body section (11) is R1, the concentric circle radius of the second transition section (13) is R3; the guide vane radius in the volute (1) is R4, and the guide vane outlet placement angle in the volute (1) is β; R3=R1-R4×tanβ; The outlet angle of the partition tongue (14) is equal to the guide vane outlet placement angle β.

8. A vertical self-priming pump according to claim 5, characterized in that: A rectangular coordinate system is established with the tangent point of the main section (11) and the first transition section (12) as T1 and point O1 as the center of the circle. The line connecting O1 and T1 is used as the y-axis of the rectangular coordinate system. The diameter direction of the main section (11) is used as the x-axis of the rectangular coordinate system. The intersection point of the concentric circle of the main section (11) and one side of the outlet flow channel (15) adjacent to the x-axis is n1. The line connecting O2 and n1 is extended to the concentric circle of the first transition section (12) and intersects with the first transition section (12) at point A1. A1 is the end of the first transition section (12).

9. A vertical self-priming pump according to claim 5, characterized in that: The intangent point between the main section (11) and the second transition section (13) is T2, the guide vane (3) is coaxially arranged with the main section (11), the radius of the concentric circle S4 of the guide vane (3) is R4, a rectangular coordinate system is established with point O1 as the center, the line connecting O1 and T2 is used as the y-axis of the rectangular coordinate system, the diameter direction of the main section (11) is used as the x-axis of the rectangular coordinate system, and the intersection point of the concentric circle S4 of the guide vane (3) and one side of the outlet flow channel (15) adjacent to the x-axis is n2; point n2 is used as the intersection point of the concentric circle S4 of the guide vane (3) and the outlet flow channel (15) adjacent to the x-axis. The tangent of point n2 is μ2, and a ray W2 is made 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 ray W2 is made from point n2 and intersects with the y-axis at point O4. The symmetric point of point O4 about the x-axis is the center point O3 of the second transition section (13). A perpendicular line perpendicular to ray W2 is made from point O3. The intersection point of the perpendicular line and the concentric circle S2 of the second transition section (13) is point A2. Point A2 is the end of the second transition section (13).

10. A vertical self-priming pump according to any one of claims 1 to 4, characterized in that: The volute (1), the water inlet flow channel (2) and the water outlet flow channel (3) are integrally cast to form a pump casing; the top of the pump casing is open, and a motor (6) is arranged at the opening as a power source for the pump shaft (5).

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