Welded multi-stage centrifugal pump

Abstract

The utility model discloses a welding type multistage centrifugal pump which comprises a water inlet section, a middle section, a water outlet section and a connecting piece, the middle section is arranged between the water inlet section and the water outlet section, the water inlet section and the water outlet section are fixedly connected through the connecting piece, and the water inlet section comprises a suction box body, a first pull plate, a suction flange and a first pump foot. A suction box body is arranged on the left side of the middle section, a suction flange is welded to the outer side of the suction box body, the suction box body is sleeved with a first pulling plate, the inner side of the first pulling plate is welded to the surface of the suction box body, and a first pump foot is arranged at the bottom of the first pulling plate; a discharge box body is arranged on the right side of the middle section, a discharge flange is welded to the outer side of the discharge box body, a second pulling plate is arranged on the discharge box body in a sleeving mode, and the inner side of the second pulling plate is welded to the surface of the discharge box body.

Description

Technical Field

[0001] The utility model relates to the technical field of multi-stage centrifugal pumps, in particular to a welded multi-stage centrifugal pump. Background Art

[0002] There are many types of pumps, which can be divided into vane pumps, volumetric pumps and other types of pumps according to their working principles. Centrifugal pumps are a type of vane pump. Compared with single-stage centrifugal pumps, multi-stage centrifugal pumps have a wider range of uses and a larger market share.

[0003] The water inlet and outlet sections of traditional multi-stage centrifugal pumps are made of one-piece casting. Casting requires model making first, and the model making cycle is long and the cost is high. As user needs gradually develop towards customization, the delivery period requirements are gradually shortened. Traditional casting processing of water inlet and outlet sections requires mold making. The dimensions of the water inlet and outlet sections made in this way are fixed and cannot be adjusted according to site conditions, resulting in poor dimensional flexibility and poor variability. Secondly, the water inlet and outlet sections of the pump are made of one-piece casting, and need to be cast with wear-resistant materials as a whole to cope with the erosion and wear of special media containing particles and extend the service life of the pump. However, only part of the water inlet and outlet sections of the pump are in contact with the medium, and the whole is cast with wear-resistant materials, which leads to material waste, increased production costs, poor economy, and reduced product market competitiveness.

[0004] Therefore, a welded multi-stage centrifugal pump is proposed to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a welded multi-stage centrifugal pump to solve the above problems.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A welded multi-stage centrifugal pump, comprising an inlet section, a middle section, a water outlet section and a connecting piece, the middle section being arranged between the water inlet section and the water outlet section, the water inlet section and the water outlet section being fixedly connected by a connecting piece, the water inlet section comprising a suction box, a pull plate, a suction flange and a pump foot, a suction box is arranged on the left side of the middle section, a suction flange is welded on the outer side of the suction box, a pull plate one whose inner side is welded to the surface of the suction box is sleeved on the suction box, a pump foot one is arranged at the bottom of the pull plate one, the water outlet section comprising a discharge flange, a discharge box, a pull plate two and pump feet two, a discharge box is arranged on the right side of the middle section, a discharge flange is welded on the outer side of the discharge box, a pull plate two whose inner side is welded to the surface of the suction box is sleeved on the discharge box, a pump foot two is arranged at the bottom of the pull plate two, and a rotor component extending to the left side of the suction box is arranged inside the discharge box.

[0008] Preferably, the connecting member includes a tie rod bolt, a nut and a connecting hole. The upper and lower ends of the right side of the pull plate 1 and the pull plate 2 are provided with connecting holes. The connecting holes on the left and right sides are arranged in a one-to-one correspondence. A tie rod bolt with both ends passing through and extending to one side of the corresponding two connecting holes is provided between the corresponding two connecting holes, and nuts are threadedly connected to both ends of the tie rod bolt.

[0009] Preferably, the number of the middle section is at least one.

[0010] Preferably, the rotor component includes a pump shaft, guide vanes and an impeller, the inner side of the discharge box is provided with a pump shaft passing through the middle section and extending to the left side of the suction box, the inner side wall of the middle section is provided with a guide vane, and the pump shaft is provided with an impeller located in the inner cavity of the guide vane.

[0011] Preferably, the number of the pump foot 1 and the number of the pump foot 2 are both two, and a mounting hole is provided on the top of each of them.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows: the various parts of the water inlet section and the water outlet section of the pump are connected by welding, and only the suction box body, suction flange, discharge flange and discharge box body that are in contact with the medium need to be made of wear-resistant materials to cope with the erosion and wear of special medium containing particles, and the pull plate 1, pull plate 2, pump foot 1 and pump foot 2 only need to be made of general materials that meet the strength requirements, and there is no need to use wear-resistant materials as a whole, which reduces the manufacturing cost, shortens the delivery time, and greatly improves the economy of the pump. In addition, the welding processing method is flexible in size and has strong variability. The various parts of the water inlet section and the water outlet section are connected by welding. Different sizes of parts can be used for welding according to site conditions to adjust the distance between the suction flange and the discharge flange and the rotor component, the distance between the pump foot 1 and the pump foot 2 and the rotor component, and the distance between the pump foot 1 and the pump foot 2, so as to meet different installation size requirements and improve the market competitiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings further illustrate the present invention, but the contents in the accompanying drawings do not constitute any limitation to the present invention.

[0014] Figure 1 It is a front sectional view of the utility model.

[0015] In the attached figure: 1. Suction box; 2. Pull plate 1; 3. Suction flange; 4. Discharge flange; 5. Discharge box; 6. Pull plate 2; 7. Pump foot 1; 8. Pull rod bolt; 9. Pump foot 2; 10. Middle section; 11. Rotor; 12. Nut. DETAILED DESCRIPTION

[0016] The following describes the embodiments of the utility model in detail, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model. In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the utility model and simplifying the description, 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 limiting the utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, and "several" means one or more, unless otherwise clearly and specifically defined.

[0017] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0019] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides various specific examples of processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0020] In this embodiment, Figure 1 A welded multi-stage centrifugal pump is provided. The utility model comprises an inlet section, a middle section 10, an outlet section and a connecting piece. The middle section 10 is arranged between the inlet section and the outlet section, and the inlet section and the outlet section are fixedly connected by the connecting piece. The inlet section comprises a suction box 1, a pull plate 2, a suction flange 3 and a pump foot 7. A suction box 1 is provided on the left side of the middle section 10, and a suction flange 3 is welded on the outer side of the suction box 1. A pull plate 2 is sleeved on the suction box 1 and welded to the inner side of the surface thereof. A pump foot 7 is provided at the bottom of the pull plate 2. The outlet section comprises a discharge flange 4, a discharge box 5, a pull plate 6 and a pump foot 9. A discharge box 5 is provided on the right side of the middle section 10, and a discharge flange 4 is welded to the outer side of the discharge box 5. A pull plate 6 is sleeved on the discharge box 5 and welded to the inner side of the surface thereof. A pump foot 9 is provided at the bottom of the pull plate 6. A rotor component extending to the left side of the suction box 1 is provided inside the discharge box 5.

[0021] In this embodiment, the various parts of the water inlet section and the water outlet section of the pump are connected by welding. It is only necessary to use wear-resistant materials for the suction box 1, suction flange 3, discharge flange 4 and discharge box 5 that are in contact with the medium to cope with the erosion and wear of special medium containing particles. The pull plate 1 2, pull plate 2 6, pump foot 1 7 and pump foot 2 9 only need to use general materials that meet the strength requirements. There is no need to use wear-resistant materials as a whole, which reduces the manufacturing cost, shortens the delivery time, and greatly improves the economy of the pump. In addition, the welding processing method is flexible in size and has strong variability. The various parts of the water inlet section and the water outlet section are connected by welding. Different sizes of parts can be used for welding according to site conditions to adjust the distance between the suction flange 3 and the discharge flange 4 and the rotor component, the distance between the pump foot 1 7 and the pump foot 2 9 and the rotor component, and the distance between the pump foot 1 7 and the pump foot 2 9, so as to meet different installation size requirements and improve the market competitiveness of the product.

[0022] Preferably, as another embodiment of the utility model, the connecting part includes a pull rod bolt 8, a nut 12 and a connecting hole, and connecting holes are provided at the upper and lower ends of the right side of the pull plate 1 2 and the pull plate 2 6, and the connecting holes on the left and right sides are arranged in a one-to-one correspondence, and a pull rod bolt 8 with both ends respectively passing through and extending to one side of the corresponding two connecting holes is provided between the two corresponding connecting holes, and nuts 12 are threadedly connected to both ends of the pull rod bolt 8.

[0023] In this embodiment, the water inlet section, the middle section 10 and the discharge section are connected to form the entire pump casing through connecting holes, tie rod bolts 8 and nuts 12, that is, the suction box body 1, the pull plate 2, the suction flange 3, the pump foot 7, the middle section 10, the discharge flange 4, the discharge box body 5, the pull plate 6 and the pump foot 9 are tightened together.

[0024] Preferably, as another embodiment of the utility model, the number of middle sections 10 is at least one, the rotor components include a pump shaft, guide vanes and an impeller, the inner side of the discharge box 5 is provided with a pump shaft passing through the middle section 10 and extending to the left side of the suction box 1, the inner side wall of the middle section 10 is provided with a guide vane, and the pump shaft is provided with an impeller located in the inner cavity of the guide vane.

[0025] In this embodiment, the pump shaft is located on the central axis of the pump and is the transmission shaft connecting the driving device and the impeller, while the middle section is used to support and fix the pump shaft, guide vanes and impeller. The guide vanes are located around the impeller and are used to guide the liquid into the impeller. The impeller is located on the pump shaft and generates centrifugal force through rotation to suck the liquid in and press it out of the pump casing.

[0026] Preferably, as another embodiment of the utility model, the number of pump feet 1 7 and pump feet 2 9 are both two, and mounting holes are opened on the tops thereof. The four pump feet can be evenly distributed at the four corners of the bottom of the pump casing, which can effectively support the entire pump casing and provide stable supporting force to prevent the pump from shaking or tilting during operation, and the mounting holes thereon can be cooperated with fasteners for installation and fixation.

[0027] Working principle: According to the demand, when the pump needs to pump special liquids, it is only necessary to use wear-resistant materials for the suction box 1, suction flange 3, discharge flange 4 and discharge box 5 that are in contact with the medium. The water inlet section and the water outlet section of the pump do not need to use wear-resistant materials as a whole. Pull plate 1 2, pull plate 2 6, pump foot 1 7 and pump foot 2 9 only need to use general materials that meet the strength requirements to reduce the manufacturing cost and improve economy. The water inlet section is composed of the suction box 1, pull plate 1 2, suction flange 3 and pump foot 1 7, and the water outlet section is composed of the discharge flange 4, the discharge box 5, pull plate 2 6 and pump foot 2 9. The various parts of the water inlet section and the water outlet section are connected by welding. Different sizes of parts can be used for welding according to the site conditions to adjust the distance between the suction flange 3 and the discharge flange 4 and the rotor component, the distance between the pump foot 1 7 and the pump foot 2 9 and the rotor component, and the distance between the pump foot 1 7 and the pump foot 2 9, so as to make adjustments according to the site conditions to meet different installation size requirements and improve the market competitiveness of the product.

[0028] In the description of this specification, the description with reference to the terms "embodiment", "one embodiment", "certain embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0029] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementations of the present invention without creative work, and these equivalent variations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A welded multistage centrifugal pump, characterized in that: The pump comprises a water inlet section, a middle section (10), a water outlet section and a connecting piece, wherein the middle section (10) is arranged between the water inlet section and the water outlet section, and the water inlet section and the water outlet section are fixedly connected via a connecting piece, the water inlet section comprises a suction box (1), a pull plate (2), a suction flange (3) and a pump foot (7), a suction box (1) is arranged on the left side of the middle section (10), a suction flange (3) is welded on the outer side of the suction box (1), a pull plate (2) is welded on the inner side of the suction box (1), and a pull plate (2) is welded on the inner side of the suction box (1) and the pull plate (2) is welded on the outer side of the suction box (1). A pump foot 1 (7) is provided at the bottom of plate 1 (2); the water outlet section comprises a discharge flange (4), a discharge box body (5), a pull plate 2 (6) and a pump foot 2 (9); a discharge box body (5) is provided on the right side of the middle section (10); a discharge flange (4) is welded to the outer side of the discharge box body (5); a pull plate 2 (6) is sleeved on the discharge box body (5) and the inner side of the pull plate 2 (6) is welded to the surface thereof; a pump foot 2 (9) is provided at the bottom of the pull plate 2 (6); and a rotor component extending to the left side of the suction box body (1) is provided inside the discharge box body (5).

2. A welded multistage centrifugal pump according to claim 1, characterized in that: The connecting member comprises a tie rod bolt (8), a nut (12) and a connecting hole. The upper and lower ends of the right side of the pull plate 1 (2) and the pull plate 2 (6) are provided with connecting holes. The connecting holes on the left and right sides are arranged in a one-to-one correspondence. Between the two corresponding connecting holes, there is a tie rod bolt (8) with two ends passing through and extending to one side of the two corresponding connecting holes. Both ends of the tie rod bolt (8) are threadedly connected with nuts (12).

3. A welded multistage centrifugal pump according to claim 1, characterized in that: The number of the middle section (10) is at least one.

4. A welded multistage centrifugal pump according to claim 1, characterized in that: The rotor component comprises a pump shaft, a guide vane and an impeller. The inner side of the discharge box (5) is provided with a pump shaft that passes through the middle section (10) and extends to the left side of the suction box (1). The inner side wall of the middle section (10) is provided with a guide vane. The pump shaft is provided with an impeller located in the inner cavity of the guide vane.

5. A welded multistage centrifugal pump according to claim 1, characterized in that: The number of the pump foot 1 (7) and the number of the pump foot 2 (9) are both two, and a mounting hole is provided on the top of each of them.

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