A centrifugal pump body with symmetrically arranged impellers

Abstract

The present invention discloses a centrifugal pump body with symmetrically arranged impellers, relating to the technical field of centrifugal pumps, comprising a pump body cylinder, the pump body cylinder comprising an inlet end, an outlet end, and a pump body outlet located on the circumferential side of the pump body cylinder, a forward positioning ring and a reverse positioning ring being fixedly connected to the interior of the pump body cylinder between the inlet end and the pump body outlet, the forward positioning ring being arranged close to the inlet end for forwardly fixing the impeller and guide vanes, the reverse positioning ring being arranged close to the outlet end for reversely fixing the impeller and guide vanes, the forward positioning ring and the reverse positioning ring dividing the interior of the pump body cylinder into cavity one and cavity two, the outer circumferential side of the pump body cylinder away from the pump body outlet being provided with a drainage channel passing through cavity one and cavity two. The centrifugal pump body with symmetrically arranged impellers of the present invention is provided with a two-way positioning and a fan-shaped jacket inside the pump body to achieve drainage from the forward impeller to the reverse impeller, and has a simple structure, a small size, and a light weight.

Description

Technical Field

[0001] The present invention belongs to the technical field of centrifugal pumps, and in particular relates to a centrifugal pump body with symmetrically arranged impellers. Background Art

[0002] Multistage centrifugal pumps typically use a symmetrical impeller arrangement to balance axial forces. This design can increase pump reliability. In a symmetrically arranged multistage centrifugal pump, the axial thrust generated by the forward and reverse impellers cancel each other out during operation, eliminating the need for an additional balancing disc to maintain axial force balance.

[0003] Conventional multi-stage pumps with symmetrically arranged impellers often require external pipes or complex external flow channels to divert the medium from the forward impeller to the reverse impeller, resulting in a clumsy pump body and excessive volume and weight.

[0004] Therefore, it is necessary to propose a centrifugal pump body with symmetrically arranged impellers to overcome the above-mentioned technical problems existing in the prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide a centrifugal pump body with symmetrically arranged impellers, so as to solve the problems in the prior art of symmetrically arranged centrifugal pumps requiring external pipes, resulting in a complex and bulky structure, excessive volume and weight.

[0006] To achieve the above-mentioned objectives, the present invention provides the following solution: a centrifugal pump body with symmetrically arranged impellers, comprising a pump body cylinder, the pump body cylinder comprising an inlet end, an outlet end and a pump body outlet located on the circumferential side of the pump body cylinder, a forward positioning ring and a reverse positioning ring are fixedly connected to the interior of the pump body cylinder between the inlet end and the pump body outlet, the forward positioning ring is arranged close to the inlet end for forward fixing of the impeller and guide vanes, the reverse positioning ring is arranged close to the outlet end for reverse fixing of the impeller and guide vanes, the forward positioning ring and the reverse positioning ring divide the interior of the pump body cylinder into cavity one and cavity two, and a drainage channel passing through cavity one and cavity two is opened on the outer circumference of the pump body cylinder away from the pump body outlet.

[0007] Preferably, the outer peripheral side of the pump body cylinder away from the pump body outlet is connected to the outer wall of the jacket, and the outer wall of the jacket and the pump body cylinder form a fan-shaped jacket. The pump body cylinder at both ends of the fan-shaped jacket is provided with through holes that pass through the cavity one and the cavity two, and the through holes and the fan-shaped jacket constitute the drainage channel.

[0008] Preferably, the sector-shaped jackets are located on the opposite side of the pump body outlet and are symmetrically arranged along the circumference of the pump body cylinder.

[0009] Preferably, the angle of the sector jacket is 90°≤α≤270°. The angle α of the sector jacket is adjusted according to the flow rate of the pump. The greater the flow rate, the greater the angle, and vice versa.

[0010] Preferably, the outer wall of the jacket and the pump cylinder are integrally formed.

[0011] Preferably, the forward positioning ring and the reverse positioning ring are integrally formed with the pump body cylinder.

[0012] Preferably, the inlet end and the outlet end of the pump body cylinder are respectively provided with an inlet flange and an outlet flange, which are respectively used to be connected to the pump covers at both ends.

[0013] Preferably, the inlet flange, the outlet flange and the pump body cylinder are integrally formed.

[0014] Compared with the prior art, the present invention discloses at least the following beneficial effects:

[0015] The present invention provides a centrifugal pump body with symmetrically arranged impellers. A bidirectional positioning and fan-shaped jacket are arranged inside the pump body to realize drainage from the forward impeller to the reverse impeller. The pump body has a simple structure, small size and light weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A cross-sectional view of a centrifugal pump body with symmetrically arranged impellers provided by the present invention;

[0018] Figure 2 for Figure 1 Cross-sectional view at the middle BB;

[0019] In the figure: 1. Forward locating ring; 2. Reverse locating ring; 3. Sector-shaped jacket; 4. Pump cylinder; 5. Jacket outer wall; 6. Inlet flange; 7. Pump outlet; 8. Outlet flange; 9. Cavity 1; 10. Cavity 2. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Reference Figure 1 and Figure 2 As shown, the present invention provides a centrifugal pump body with symmetrically arranged impellers, comprising a pump body cylinder 4, an inlet flange 6 and an outlet flange 8 located at each end of the pump body cylinder 4, a forward locating ring 1 and a reverse locating ring 2 disposed within the pump body cylinder 4, and a fan-shaped jacket 3 formed by the jacket outer wall 5 and the pump body cylinder 4. The pump body cylinder 4 is a cylindrical structure with two open ends, one end being the inlet end and the other being the outlet end. The inlet end is connected to the inlet flange 6, and the outlet end is connected to the outlet flange 8. The inlet flange 6 and the outlet flange 8 are respectively used to connect to the pump covers at both ends. The forward locating ring 1 and the reverse locating ring 2 are fixed to the inner wall of the pump body cylinder 4 between the inlet end and the pump body outlet 7. The forward locating ring 1 is located near the inlet end and is used to forwardly fix the impeller and guide vanes. The reverse locating ring 2 is located near the outlet end and is used to reversely fix the impeller and guide vanes. The forward locating ring 1 and the reverse locating ring 2 divide the inner cavity of the entire pump body cylinder 4 into cavity 1 9 and cavity 2 10. The sector-shaped jacket 3 is surrounded by a pump body cylinder 4 and a jacket outer wall 5. Through holes are opened in the pump body cylinder 4 at both ends of the sector-shaped jacket 3, so that the sector-shaped jacket 3 is connected with cavity 1 9 and cavity 2 10 respectively, forming a drainage channel, so that the liquid flowing out of the impeller and guide vane arranged in the forward direction flows to the impeller and guide vane arranged in the reverse direction.

[0023] To further optimize the solution, the sector jacket 3 is set below the pump body outlet 7 and arranged symmetrically along the circumferential direction. The angle α of the sector jacket 3 is adjusted according to the size of the pump flow rate. The greater the flow rate, the greater the angle, and vice versa.

[0024] According to a further optimization solution, in a specific embodiment, the setting range of the angle α of the sector-shaped jacket 3 can be 90°≤α≤270°.

[0025] According to a further optimized solution, the inlet flange 6 and the outlet flange 8 are integrally formed at both ends of the pump cylinder 4 .

[0026] According to a further optimized solution, the inlet flange 6 , the outlet flange 8 and the pump body cylinder 4 are integrally formed.

[0027] According to a further optimized solution, the outer wall 5 of the jacket and the pump body cylinder 4 are integrally formed.

[0028] According to a further optimized solution, the forward positioning ring 1 and the reverse positioning ring 2 are integrally formed with the pump body cylinder 4 .

[0029] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0030] In order to solve the problems in the prior art that centrifugal pumps need external pipes, resulting in a complex and bulky structure, excessive volume and weight, the embodiments of the present invention provide a centrifugal pump body with symmetrically arranged impellers. A two-way positioning and fan-shaped jacket 3 are provided inside the pump body to achieve drainage from the forward impeller to the reverse impeller. The pump body is specifically composed of a pump body cylinder 4 with an inlet flange 6 and an outlet flange 8 at both ends, and a forward positioning ring 1, a reverse positioning ring 2 and an external fan-shaped jacket 3 inside the cylinder. The forward positioning ring 1 and the reverse positioning ring 2 are used to fix the forward-arranged impeller and guide vanes and the reverse-arranged impeller and guide vanes, respectively. The forward positioning ring 1 and the reverse positioning ring 2 are located on the inlet flange 6 side of the pump body outlet 7, and are connected to the pump body cylinder 4 as a whole, dividing the pump body into cavity 1 9 and cavity 2 10. The fan-shaped jacket 3 is surrounded by a pump body cylinder 4 and a jacket outer wall 5. The fan-shaped jacket 3 is positioned below the pump body outlet 7 and is arranged symmetrically along the circumference. The angle α of the fan-shaped jacket 3 is adjusted according to the pump flow rate. The greater the flow rate, the larger the angle, and vice versa. Through holes are provided in the pump body cylinder 4 at both ends of the fan-shaped jacket 3, connecting the fan-shaped jacket 3 to the described cavity 1 9 and cavity 2 10, respectively, so that the liquid flowing out of the forward impeller and guide vanes flows to the reversely arranged impeller and guide vanes. This embodiment of the invention does not require an external pipe to guide the medium from the forward impeller to the reverse impeller, and has a simple structure, small size, and light weight.

[0031] The centrifugal pump body with symmetrically arranged impellers in the embodiment of the present invention has the advantages of simple structure, small size and light weight compared to the traditional symmetrically distributed centrifugal pump body.

[0032] Any details not provided in the present invention are conventional technical means known to those skilled in the art.

[0033] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A centrifugal pump body with symmetrically arranged impellers, characterized in that: The invention comprises a pump body cylinder (4), wherein the pump body cylinder (4) comprises an inlet end, an outlet end and a pump body outlet (7) located on the circumferential side of the pump body cylinder (4); a forward positioning ring (1) and a reverse positioning ring (2) are fixedly connected inside the pump body cylinder (4) between the inlet end and the pump body outlet (7); the forward positioning ring (1) is arranged near the inlet end and is used to fix the impeller and the guide vane in the forward direction; the reverse positioning ring (2) is arranged near the outlet end and is used to fix the impeller and the guide vane in the reverse direction; the forward positioning ring (1) and the reverse positioning ring (2) divide the inside of the pump body cylinder (4) into a cavity 1 (9) and a cavity 2 (10); and a drainage channel penetrating the cavity 1 (9) and the cavity 2 (10) is opened on the outer circumferential side of the pump body cylinder (4) away from the pump body outlet (7); The outer peripheral side of the pump body cylinder (4) away from the pump body outlet (7) is connected to the jacket outer wall (5), and the jacket outer wall (5) and the pump body cylinder (4) enclose a fan-shaped jacket (3), and the pump body cylinder (4) at both ends of the fan-shaped jacket (3) is provided with through holes penetrating into the cavity one (9) and the cavity two (10), and the through holes and the fan-shaped jacket (3) constitute the drainage channel; The fan-shaped jacket (3) is located on the opposite side of the pump body outlet (7) and is symmetrically arranged along the circumference of the pump body cylinder (4); the included angle of the fan-shaped jacket (3) is 90°≤α≤270°; The forward positioning ring (1), the reverse positioning ring (2), the jacket outer wall (5) and the pump body cylinder (4) are integrally formed.

2. The centrifugal pump body with symmetrically arranged impellers according to claim 1, characterized in that: The inlet end and the outlet end of the pump body cylinder (4) are respectively provided with an inlet flange (6) and an outlet flange (8).

3. The centrifugal pump body with symmetrically arranged impellers according to claim 2, characterized in that: The inlet flange (6), the outlet flange (8) and the pump body cylinder (4) are integrally formed.

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