Volute and method of mounting same

Abstract

The application discloses a volute and a mounting method thereof. The volute comprises a first cylinder section, a plurality of first volute sections connected in sequence, a plurality of second cylinder sections connected in sequence, a second cylinder section at an end connected with the first cylinder section, and axes of the plurality of second cylinder sections and an axis of the first cylinder section connected to form at least a part of a spiral line, a plurality of first gasket strips extending in a circumferential direction of the spiral line, and at least one first gasket strip arranged outside a connection of any two adjacent first volute sections. The volute and the mounting method thereof can improve stress concentration of the volute and improve structural strength of the volute.

Description

Technical Field

[0001] This application relates to the field of water pump technology, and in particular to a volute housing and its installation method. Background Technology

[0002] Pumped storage power stations have multiple uses, including peak shaving and valley filling, frequency and phase regulation, and emergency backup. They play an important role in ensuring the safe, stable and economical operation of the power system. They are also an important source of green and clean energy, playing a vital role in optimizing the energy structure, promoting the development and utilization of new energy sources, and protecting the ecological environment.

[0003] As an important component of pumped storage power stations, pump turbines are gradually developing towards higher head, higher speed and larger capacity. Pumped storage units have complex operating conditions and frequent start-ups and shutdowns. During operation, they may generate large alternating hydraulic excitations, which can affect the key structures of the unit.

[0004] The primary function of the spiral casing is to ensure uniform and axially symmetrical water flow into the guide vane mechanism, and to create necessary circulation before the guide vane mechanism to reduce workload. The spiral casing is designed with a gradually decreasing cross-section to minimize hydraulic losses, while also helping to reduce plant size and civil engineering costs. Spiral casings are typically made of reinforced concrete or metal to accommodate different head and capacity requirements. As the largest pressure-bearing component of the pump turbine, the spiral casing is highly susceptible to stress concentration or improper stress distribution due to differences in stiffness, hardness, and strength between it and concrete. Summary of the Invention

[0005] This application provides a volute and its installation method, which can improve the stress concentration phenomenon of the volute and increase the structural strength of the volute.

[0006] In a first aspect, embodiments of this application provide a volute, comprising: a first cylindrical section including a plurality of first volutes connected in sequence; a plurality of second cylindrical sections connected in sequence, wherein the second cylindrical sections located at the ends are connected to the first cylindrical sections, and the axes of the plurality of second cylindrical sections and the axes of the first cylindrical sections are connected to form at least a portion of a helix; and a plurality of first spacers extending circumferentially along the helix, wherein at least one first spacer is provided on the outer side of the connection between any two adjacent first volutes.

[0007] According to an embodiment of the first aspect of this application, the second section includes a plurality of second worm gears connected in sequence; at least one first pad is provided on the outer side of the connection between at least two adjacent second worm gears.

[0008] According to an embodiment of the first aspect of this application, the second cylinder section further includes a first connecting section, a first positioning section, a second connecting section, a second positioning section, a third connecting section, and a fourth connecting section. The fourth connecting section, the first cylinder section, the first connecting section, the first positioning section, the second connecting section, the second positioning section, and the third connecting section are connected sequentially, and the first connecting section, the first positioning section, the second connecting section, the second positioning section, the third connecting section, and the fourth connecting section all include a plurality of second worm gears. In the first connecting section, the first positioning section, and the second connecting section, each second worm gear has at least one first pad at at least one end along its own axial direction. In the second positioning section, the third connecting section, and the fourth connecting section, each second worm gear has at most one first pad at at most one end along its own axial direction.

[0009] According to an embodiment of the first aspect of this application, the outer surface of the first pad is provided with a plurality of first protrusions, and the extending direction of the first protrusions is the same as the extending direction of the first pad.

[0010] According to an embodiment of the first aspect of this application, the first volute includes a plurality of first volute plates, which are connected end to end in sequence to form the first volute; the volute also includes a plurality of second spacers, which extend along the extension direction of the spiral, and at least one second spacer is provided on the outer side of the connection between any two adjacent first volute plates.

[0011] According to an embodiment of the first aspect of this application, the second cylindrical section includes a plurality of second worm joints connected in sequence; the second worm joint includes a plurality of second worm plates connected end to end in sequence to form a second worm joint; at least one second pad is provided on the outer side of the connection between at least two adjacent second worm plates.

[0012] According to an embodiment of the first aspect of this application, the second cylindrical section further includes a first connecting section, a first positioning section, a second connecting section, a second positioning section, a third connecting section, and a fourth connecting section. The fourth connecting section, the first cylindrical section, the first connecting section, the first positioning section, the second connecting section, the second positioning section, and the third connecting section are connected sequentially. Each of the first connecting section, the first positioning section, the second connecting section, the second positioning section, the third connecting section, and the fourth connecting section includes a plurality of second worm gears. Each second worm gear includes a plurality of second worm plates, which are connected end to end in sequence to form a second worm gear. In the first connecting section, the first positioning section, the second connecting section, the second positioning section, the third connecting section, and the fourth connecting section, each second worm plate has at least one second pad strip at at most one end along its own circumference.

[0013] According to an embodiment of the first aspect of this application, the second cylinder section includes a plurality of second worm joints connected in sequence; along the extension direction of the spiral, the minimum axial length of the first worm joint and the second worm joint is Lmin, the width of the first spacer is D1, and the width of the second spacer is D2, wherein 0.2Lmin≤D1≤0.4Lmin, 0.2Lmin≤D2≤0.4Lmin.

[0014] According to an embodiment of the first aspect of this application, the outer surface of the second pad is provided with a plurality of second protrusions, and the extending direction of the second protrusions is the same as the extending direction of the second pad.

[0015] According to an embodiment of the first aspect of this application, both the first and second spacers are made of copper.

[0016] Secondly, embodiments of this application provide a method for installing a volute, used to install a volute according to an embodiment of the first aspect of this application. The second cylindrical section further includes a first fitting section, a first positioning section, a second fitting section, a second positioning section, a third fitting section, and a fourth fitting section. The fourth fitting section, the first cylindrical section, the first fitting section, the first positioning section, the second fitting section, the second positioning section, and the third fitting section are connected sequentially. Each of the first fitting section, the first positioning section, the second fitting section, the second positioning section, the third fitting section, and the fourth fitting section includes multiple second volute sections. The method for installing the volute includes: installing and fixing the first cylindrical section, the first positioning section, and the second positioning section; installing and fixing the first fitting section, the second fitting section, the third fitting section, and the fourth fitting section; welding the joints of the multiple first volute sections, the joints of the multiple second volute sections, and the joints of the first volute section and the second volute section; and installing a first spacer strip.

[0017] In the volute and its installation method provided in this application embodiment, the volute is composed of a first cylindrical section and a plurality of second cylindrical sections connected together. The first cylindrical section is composed of a plurality of first volute sections connected together. A first pad is set on the outside of the connection between any two adjacent first volute sections, which can reinforce each circumferential seam formed by the connection of the first volute sections. Under the premise that the first cylindrical section generates maximum stress, it strengthens the protection of the first cylindrical section, alleviates the stress concentration phenomenon at the circumferential seam of the first cylindrical section, improves the structural strength of the first cylindrical section, and thus improves the structural strength of the entire volute section. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a volute according to an embodiment of this application.

[0020] Figure 2 This is a schematic diagram of another structure of the volute according to an embodiment of this application.

[0021] Figure 3 This is a partial schematic diagram of the first section of the volute casing according to an embodiment of this application.

[0022] Figure 4 This is a partial schematic diagram of the second section of the volute casing according to an embodiment of this application.

[0023] Figure 5 This is another partial schematic diagram of the first section of the volute casing according to an embodiment of this application.

[0024] Figure 6 This is another partial schematic diagram of the second section of the volute casing according to an embodiment of this application.

[0025] Figure 7 This is a cross-sectional schematic diagram of the first pad of the volute in an embodiment of this application.

[0026] Figure 8 This is a cross-sectional schematic diagram of the second pad of the volute in an embodiment of this application.

[0027] Figure 9 This is a flowchart illustrating a method for installing a volute according to an embodiment of this application.

[0028] Figure label:

[0029] 1. First segment; 11. First spiral segment; 111. First spiral plate;

[0030] 2. Second cylinder section; 21. Second worm section; 211. Second worm plate;

[0031] 3. First spacer strip; 31. First protrusion;

[0032] 4. Second pad; 41. Second protrusion;

[0033] W2, First connecting joint; W3, First positioning joint; W4, Second connecting joint; W5, Second positioning joint; W6, Third connecting joint; W7, Fourth connecting joint. Detailed Implementation

[0034] The features and exemplary embodiments of various aspects of this application will now be described in detail. Numerous specific details are set forth in the following detailed description in order to provide a comprehensive understanding of this application. However, it will be apparent to those skilled in the art that this application can be implemented without some of these specific details. The following description of embodiments is merely intended to provide a better understanding of this application by illustrating examples thereof.

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The embodiments will now be described in detail with reference to the accompanying drawings.

[0036] Relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0037] It should be understood that when describing the structure of a component, when referring to a layer or region as being "above" or "on top of" another layer or region, it can mean that it is directly above the other layer or region, or that it contains other layers or regions between it and the other layer or region. Furthermore, if the component is flipped over, that layer or region will be located "below" or "under" the other layer or region.

[0038] Furthermore, the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0039] It should be understood that in the embodiments of this application, "B corresponding to A" means that B is associated with A, and B can be determined based on A. However, it should also be understood that determining B based on A does not mean that B is determined solely based on A; B can also be determined based on A and / or other information.

[0040] The applicant discovered that the spiral casing used in water pump turbines needs to withstand extremely high forces. Both the locating and connecting sections of the spiral casing are composed of multiple spiral sections connected by welding. Under the influence of the forces applied to the spiral casing, significant stress concentration occurs at the weld seams, affecting the structural strength and mechanical properties of the casing. The first locating section, in particular, bears the greatest force and is most prone to stress concentration, making it the most susceptible to damage, which in turn leads to the failure of the entire spiral casing.

[0041] Based on the above analysis, the applicant proposes a volute and its installation method. The volute is composed of a first cylindrical section and multiple second cylindrical sections connected together. The first cylindrical section is composed of multiple first volute sections connected together. A first pad is set on the outside of the connection between any two adjacent first volute sections, which can reinforce each circumferential joint formed by the connection of the first volute sections. Under the premise that the first cylindrical section generates maximum stress, it strengthens the protection of the first cylindrical section, alleviates the stress concentration phenomenon at the circumferential joint of the first cylindrical section, improves the structural strength of the first cylindrical section, and thus improves the structural strength of the entire volute.

[0042] Figure 1 This is a schematic diagram of the structure of a volute according to an embodiment of this application. Figure 2 This is a schematic diagram of another structure of the volute according to an embodiment of this application. Figure 3 This is a partial schematic diagram of the first section of the volute casing according to an embodiment of this application.

[0043] Please see Figures 1 to 3 This application provides a volute, comprising: a first cylindrical section 1, including a plurality of first volutes 11 connected in sequence; a plurality of second cylindrical sections 2, connected in sequence, wherein the second cylindrical section 2 located at the end is connected to the first cylindrical section 1, and the axes of the plurality of second cylindrical sections 2 and the axis of the first cylindrical section 1 are connected to form at least a portion of a spiral; and a plurality of first spacers 3, extending circumferentially along the spiral, wherein at least one first spacer 3 is provided on the outer side of the connection between any two adjacent first volutes 11.

[0044] The volute casing of this embodiment is used in a water pump turbine. A first cylindrical section 1 and multiple second cylindrical sections 2 are connected sequentially to form the main structure of the volute casing of this embodiment. The axis of the first cylindrical section 1 and the axis of the second cylindrical section 2 are connected to form the helical axis of the volute casing of this embodiment. It should be noted that this helical line is not a cylindrical helix or a conical helix in the strict sense, but a three-dimensional helix in a spiral shape.

[0045] Multiple first worm joints 11 are connected to form a first cylindrical section 1. These first worm joints 11 can be connected together by welding or other methods to form the first cylindrical section 1. The connection point between two adjacent first worm joints 11 is the circumferential seam of the first cylindrical section 1. Considering that the first cylindrical section 1 is used as the first cylindrical section (positioning section) of the entire volute, and multiple second cylindrical sections 2 are used as subsequent cylindrical sections (positioning sections and fitting sections) starting from the second cylindrical section, when the volute of this embodiment is subjected to external force, the first cylindrical section 1 bears the greatest external force, while the second cylindrical section 2 bears a significantly smaller external force than the first cylindrical section 1. Therefore, the first cylindrical section 1 is most prone to stress concentration, especially at the circumferential seam of the first cylindrical section 1.

[0046] The first pad 3 is strip-shaped and can be bent into a ring or arc shape to strengthen the structural strength of the circumferential joint. At least one first pad 3 is provided on the outer side of the connection between any two adjacent first worm joints 11. By covering the circumferential joint from the outside with the first pad 3, the circumferential joint is structurally strengthened. This not only reduces the possibility of breakage at the connection between the two first worm joints 11 but also releases stress at the connection, adjusts the stress distribution, and alleviates stress concentration. Each circumferential joint is reinforced with a first pad 3; that is, a first pad 3 is provided on the outer side of the connection between any two adjacent first worm joints 11, so that the entire first cylinder section 1 is reinforced.

[0047] The volute of this embodiment strengthens the structure of the first cylindrical section 1 by using the first pad 3, which can alleviate stress concentration in the volute, improve the structural strength of the volute, and reduce the risk of damage to the volute. It should be noted that for a single circumferential seam, a single bendable annular first pad 3 can be used for reinforcement, or multiple bendable arc-shaped first pads 3 can be used for reinforcement.

[0048] Figure 4 This is a partial schematic diagram of the second section of the volute casing according to an embodiment of this application.

[0049] Further, please refer to Figure 4 and combined Figures 1 to 3 The second cylindrical section 2 includes a plurality of second worm joints 21, which are connected in sequence; at least one first pad 3 is provided on the outer side of the connection between at least two adjacent second worm joints 21.

[0050] Similar to the first cylindrical section 1, multiple second worm gears 21 are connected to form a second cylindrical section 2. Adjacent second worm gears 21 can be connected by welding or other means, and the connection point between two adjacent second worm gears 21 is the circumferential seam of the second cylindrical section 2. It is understood that the shapes of the first cylindrical section 1 and the second cylindrical section 2 can be the same or different, and the shapes of the first worm gear 11 and the second worm gear 21 can be the same or different. Considering that the external force borne by the second cylindrical section 2 is significantly less than that borne by the first cylindrical section 1, it is not necessary to reinforce all the circumferential seams of the second cylindrical section 2, provided that the reinforcement requirements of the second cylindrical section 2 are met. However, some of the circumferential seams of the second cylindrical section 2 should be appropriately reinforced using first spacers 3. That is, at least one first spacer 3 is provided on the outer side of the connection point of at least two adjacent second worm gears 21. By appropriately reducing the number of first spacers 3 used, the installation process of the volute of this application embodiment can be simplified, and the cost of the volute of this application embodiment can be reduced.

[0051] Further reading Figures 1 to 4The second cylindrical section 2 further includes a first mating section W2, a first positioning section W3, a second mating section W4, a second positioning section W5, a third mating section W6, and a fourth mating section W7. The fourth mating section W7, the first cylindrical section 1, the first mating section W2, the first positioning section W3, the second mating section W4, the second positioning section W5, and the third mating section W6 are connected sequentially, and the first mating section W2, the first positioning section W3, the second mating section W4, the second positioning section W5, the third mating section W6, and the fourth mating section W7 each include multiple second worm gears 21. In the first mating section W2, the first positioning section W3, and the second mating section W4, each second worm gear 21 has at least one first pad 3 at at least one end along its own axial direction. In the second positioning section W5, the third mating section W6, and the fourth mating section W7, each second worm gear 21 has at most one first pad 3 at its own axial direction.

[0052] In this embodiment, the fourth connecting section W7, the first cylindrical section 1, the first connecting section W2, the first positioning section W3, the second connecting section W4, the second positioning section W5, and the third connecting section W6 are connected sequentially to form the volute body of this embodiment. When installing the volute of this embodiment, the positioning sections, namely the first cylindrical section 1, the first positioning section W3, and the second positioning section W5, need to be installed first, followed by the connecting sections, namely the first connecting section W2, the second connecting section W4, the third connecting section W6, and the fourth connecting section W7.

[0053] When using the volute of the embodiment, fluid flows in from the fourth connecting section W7, passes sequentially through the first cylindrical section 1, the first connecting section W2, the first positioning section W3, the second connecting section W4, and the second positioning section W5, and flows out from the third connecting section W6. Therefore, the external forces on the first cylindrical section 1, the first connecting section W2, the first positioning section W3, the second connecting section W4, the second positioning section W5, and the third connecting section W6 decrease sequentially. The fourth connecting section W7 is used to connect the outside world with the first cylindrical section 1, so the external force on the fourth connecting section W7 is also less than that on the first cylindrical section 1.

[0054] For the first mating section W2, the first positioning section W3, and the second mating section W4, in all the annular seams after the second worm joint 21 is connected in sequence, the first pad 3 can be provided in each annular seam, or the first pad 3 can be provided in every other annular seam. That is to say, for each second worm joint 21, at least one of the annular seams at its two ends is provided with the first pad 3.

[0055] For the second positioning section W5, the third mating section W6 and the fourth mating section W7, in all the annular seams after the second worm joint 21 is connected in sequence, the first pad 3 can be set every other annular seam or every multiple annular seams, for example, every two annular seams. That is to say, for each second worm joint 21, at most one of the annular seams at its two ends is provided with the first pad 3.

[0056] Therefore, the volute of this application embodiment can reduce the amount of the first pad 3 while ensuring the structural strength of each section, thereby reducing installation difficulty and saving installation costs.

[0057] Figure 5 This is another partial schematic diagram of the first section of the volute casing according to an embodiment of this application.

[0058] Further, please refer to Figure 5 The first volute 11 includes a plurality of first volute plates 111, which are connected end to end to form the first volute 11. The volute also includes a plurality of second spacers 4, which extend along the extension direction of the spiral. At least one second spacer 4 is provided on the outer side of the connection between any two adjacent first volute plates 111.

[0059] The first worm blade 111 can be an arc-shaped surface. Multiple first worm blades 111 are connected end-to-end in a ring to form a first worm segment 11. Multiple first worm segments 11 are then connected to form a first cylindrical section 1. Adjacent first worm blades 111 can be connected by welding or other means, and the connection point of two first worm blades 111 is the longitudinal seam of the first cylindrical section 1. When the first cylindrical section 1 is subjected to external force, stress concentration is also prone to occur at the longitudinal seam of the first cylindrical section 1.

[0060] The second pad 4 is strip-shaped and can be bent into an arc to strengthen the structural strength of the longitudinal joint. At least one second pad 4 is provided on the outer side of the connection between any two adjacent first worm gears 111. By covering the longitudinal joint from the outside with the second pad 4, the longitudinal joint is structurally strengthened. This not only reduces the possibility of breakage at the connection between the two first worm gears 111, but also releases stress at the connection, adjusts the stress distribution, and alleviates stress concentration. Each longitudinal joint is reinforced by the first pad 3; that is, a second pad 4 is provided on the outer side of the connection between any two adjacent first worm gears 111, so that the entire first worm joint 11 is reinforced, thereby reinforcing the entire first cylinder section 1.

[0061] Figure 6 This is another partial schematic diagram of the second section of the volute casing according to an embodiment of this application.

[0062] Further, please refer to Figure 6 The second section 2 includes a plurality of second worm joints 21, which are connected in sequence; the second worm joint 21 includes a plurality of second worm plates 211, which are connected end to end to form the second worm joint 21; at least one second pad 4 is provided on the outer side of the connection between at least two adjacent second worm plates 211.

[0063] Similar to the first cylindrical section 1, multiple second worm gears 211 are connected to form a second worm gear 21, and multiple second worm gears 21 are connected to form a second cylindrical section 2. Adjacent second worm gears 211 can be connected by welding or other means, and the connection point of two adjacent second worm gears 211 is the longitudinal seam position of the second cylindrical section 2. It is understood that the shapes of the first cylindrical section 1 and the second cylindrical section 2 can be the same or different, the shapes of the first worm gear 11 and the second worm gear 211 can be the same or different. Considering that the external force borne by the second cylindrical section 2 is significantly smaller than that borne by the first cylindrical section 1, it is not necessary to reinforce all the longitudinal seams of the second cylindrical section 2, provided that the reinforcement requirements of the second cylindrical section 2 are met. However, some of the longitudinal seams of the second cylindrical section 2 should be appropriately reinforced by second spacers 4. That is, at least one second spacer 4 is provided on the outer side of the connection point of at least two adjacent second worm gears 211. By appropriately reducing the number of second spacers 4 used, the installation process of the volute of this application embodiment can be simplified and the cost of the volute of this application embodiment can be reduced.

[0064] Further reading Figure 5 and Figure 6 and combined Figure 1 and Figure 2 The second cylindrical section 2 further includes a first connecting section W2, a first positioning section W3, a second connecting section W4, a second positioning section W5, a third connecting section W6, and a fourth connecting section W7. The fourth connecting section W7, the first cylindrical section 1, the first connecting section W2, the first positioning section W3, the second connecting section W4, the second positioning section W5, and the third connecting section W6 are connected in sequence, and the first connecting section W2, the first positioning section W3, the second connecting section W4, the second positioning section W5, the third connecting section W6, and the fourth connecting section W7 each include multiple second worm joints 21; the second worm joint 21 includes multiple second worm plates 211, and the multiple second worm plates 211 are connected end to end in sequence to form a second worm joint 21; in the first connecting section W2, the first positioning section W3, the second connecting section W4, the second positioning section W5, the third connecting section W6, and the fourth connecting section W7, each second worm plate 211 has at least one second pad 4 at most one end along its own circumference.

[0065] When using the volute casing of this application embodiment, the axial stress generated after the second cylindrical section 2 is subjected to external force is significantly greater than the tangential stress. Therefore, the tangential stress of each of the first mating section W2, the first positioning section W3, the second mating section W4, the second positioning section W5, the third mating section W6, and the fourth mating section W7 is less than the axial stress. While meeting the reinforcement requirements of the second cylindrical section 2, a second spacer 4 is provided in every longitudinal seam, or in each of multiple longitudinal seams. For example, a second spacer 4 is provided every 1-2 longitudinal seams. That is, for each second volute 211, at most one of the longitudinal seams corresponding to its two ends is provided with a first spacer 3.

[0066] Furthermore, the second cylindrical section 2 includes a plurality of second worm joints 21, which are connected in sequence; along the extension direction of the spiral, the minimum axial length of the first worm joint 11 and the second worm joint 21 is Lmin, the width of the first pad 3 is D1, and the width of the second pad 4 is D2, wherein 0.2Lmin≤D1≤0.4Lmin and 0.2Lmin≤D2≤0.4Lmin.

[0067] The first spacer 3 is used to reinforce the circumferential joint between the first cylinder section 1 and the second cylinder section 2, and the second spacer 4 is used to reinforce the longitudinal joint between the first cylinder section 1 and the second cylinder section 2. By ensuring that the width D1 of the first spacer 3 and the width D2 of the second spacer 4 are both within the range of 0.2-0.4 times the length of the worm gear axis, the material usage of the first spacer 3 and the second spacer 4 can be reduced while meeting the reinforcement requirements of the first cylinder section 1 and the second cylinder section 2, thereby reducing the cost of the worm casing in this embodiment. The worm gear axis length refers to the minimum axis length of the first worm gear 11 and the second worm gear 21, which is Lmin. The axis of the first worm gear 11 and the second worm gear 21 can be considered as an arc length of a helix.

[0068] Figure 7 This is a cross-sectional schematic diagram of the first pad of the volute in an embodiment of this application.

[0069] Further, please refer to Figure 7 The outer surface of the first pad 3 is provided with a plurality of first protrusions 31, and the extension direction of the first protrusions 31 is the same as the extension direction of the first pad 3.

[0070] The first pad strip 3 is strip-shaped. The inner side of the first pad strip 3, that is, the side that contacts the first cylinder section 1 or the second cylinder section 2, has the same shape as the outer side of the first cylinder section 1 or the second cylinder section 2. The outer surface of the first pad strip 3 is provided with a plurality of first protrusions 31, and the extending direction of the first protrusions 31 is the same as the extending direction of the first pad strip 3, so that the outer surface of the first pad strip 3 presents a wavy curved surface with ups and downs. For example, in the cross section perpendicular to the extending direction of the first pad strip 3, the outer surface of the first pad strip 3 is part of a chord curve. Considering that when using the volute of the embodiment of this application, the outer shell of the volute will be poured with concrete, the wavy curved surface of the outer surface of the first pad strip 3 is beneficial to improving the connection between the first pad strip 3 and the concrete.

[0071] Figure 8 This is a cross-sectional schematic diagram of the second pad of the volute in an embodiment of this application.

[0072] Further, please refer to Figure 8 The outer surface of the second pad 4 is provided with a plurality of second protrusions 41, and the extension direction of the second protrusions 41 is the same as the extension direction of the second pad 4.

[0073] Similar to the first pad 3, the second pad 4 is strip-shaped. The inner side of the second pad 4, that is, the side that contacts the first cylinder section 1 or the second cylinder section 2, has the same shape as the outer side of the first cylinder section 1 or the second cylinder section 2. The outer surface of the second pad 4 is provided with a plurality of second protrusions 41, and the extending direction of the second protrusions 41 is the same as the extending direction of the second pad 4, so that the outer surface of the second pad 4 presents a wavy curved surface. For example, in the cross section perpendicular to the extending direction of the second pad 4, the outer surface of the second pad 4 is part of a chord curve. Considering that when using the volute of this application embodiment, the outer shell of the volute will be poured with concrete, the wavy curved surface of the outer surface of the second pad 4 is beneficial to improving the connection strength between the second pad 4 and the concrete.

[0074] Furthermore, both the first pad 3 and the second pad 4 are made of copper. For example, brass or other copper materials with good plasticity can be used, which can withstand large deformations of compression, tension and bending. Since copper materials have low stiffness, low hardness and high plasticity, they can improve the stress concentration phenomenon and stress distribution of the volute in the embodiments of this application.

[0075] Figure 9 This is a flowchart illustrating a method for installing a volute according to an embodiment of this application.

[0076] Please see Figure 9 This application embodiment also provides a method for installing a volute, used to install the volute of the aforementioned embodiment of this application. The second cylindrical section 2 of the volute further includes a first mating section W2, a first positioning section W3, a second mating section W4, a second positioning section W5, a third mating section W6, and a fourth mating section W7. The fourth mating section W7, the first cylindrical section 1, the first mating section W2, the first positioning section W3, the second mating section W4, the second positioning section W5, and the third mating section W6 are connected in sequence. The first mating section W2, the first positioning section W3, the second mating section W4, the second positioning section W5, the third mating section W6, and the fourth mating section W7 each include a plurality of second volute sections 21.

[0077] It is understandable that the concrete pouring of the outer casing will be completed at the same time as the worm gear is installed.

[0078] The volute mounting method of this application embodiment includes:

[0079] S1. Install the positioning section.

[0080] Considering that the first tube section 1 is also used as a positioning section, the first tube section 1, the first positioning section W3, and the second positioning section W5 are installed and fixed. Understandably, before installing the positioning sections, the base components of the volute casing need to be installed, and the volute casing support concrete needs to be poured; this can be carried out using conventional methods.

[0081] S2. Install the assembly section.

[0082] Install and fix the first connecting section W2, the second connecting section W4, the third connecting section W6, and the fourth connecting section W7. This ensures that the fourth connecting section W7, the first cylindrical section 1, the first connecting section W2, the first positioning section W3, the second connecting section W4, the second positioning section W5, and the third connecting section W6 are connected sequentially.

[0083] S3. Welding and fixing.

[0084] Welding is performed at the joints of multiple first worm joints 11, multiple second worm joints 21, and the joints of first worm joints 11 and second worm joints 21; that is, welding circumferential seams. Considering that multiple first worm blades 111 are connected to form a first worm joint 11, and multiple second worm blades 211 are connected to form a second worm joint 21, the joints of the first worm blades 111 and the joints of the second worm blades 211 can also be welded; that is, welding longitudinal seams. Through welding circumferential and longitudinal seams, the fourth mating section W7, the first cylinder section 1, the first mating section W2, the first positioning section W3, the second mating section W4, the second positioning section W5, and the third mating section W6 are sequentially connected into a single unit.

[0085] S4. Install the first spacer strip 3.

[0086] First spacer strips 3 are installed at each circumferential joint of the first cylindrical section 1; first spacer strips 3 are installed at each circumferential joint or every other circumferential joint of the first mating section W2, first positioning section W3, and second mating section W4; first spacer strips 3 are installed every one or two circumferential joints of the second positioning section W5, third mating section W6, and fourth mating section W7. Considering that multiple first worm gears 111 are connected to form a first worm joint 11, and multiple second worm gears 211 are connected to form a second worm joint 21, second spacer strips 4 are installed at each longitudinal joint of the first cylindrical section 1; second spacer strips 4 are installed every one or two longitudinal joints of the first mating section W2, first positioning section W3, second mating section W4, second positioning section W5, third mating section W6, and fourth mating section W7. After the installation of the first spacer strips 3 and the second spacer strips 4 is completed, the volute can be pressurized, and then concrete can be poured around the volute.

[0087] This application provides a volute and its installation method. The volute is composed of a first cylindrical section and multiple second cylindrical sections connected together. The first cylindrical section is composed of multiple first volute segments connected together. A first spacer strip is disposed on the outside of the connection between any two adjacent first volute segments, which can reinforce each circumferential joint formed by the connection of the first volute segments. Under the premise that the first cylindrical section generates maximum stress, it strengthens the protection of the first cylindrical section, alleviates the stress concentration phenomenon at the circumferential joint of the first cylindrical section, improves the structural strength of the first cylindrical section, and thus improves the structural strength of the entire volute segment.

[0088] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A volute, characterized in that, include: The first section includes multiple first spiral sections, which are connected sequentially. A plurality of second cylindrical sections are connected in sequence, with the second cylindrical section at the end connected to the first cylindrical section, and the axes of the plurality of second cylindrical sections and the axis of the first cylindrical section are connected to form at least a portion of a helix; the second cylindrical section includes a plurality of second worm joints, which are connected in sequence. Multiple first pads extend circumferentially along the spiral line, and at least one first pad is provided on the outer side of the connection between any two adjacent first worm joints to release the stress at the connection between two adjacent first worm joints. The first pad is strip-shaped and bent into a ring or arc shape, and multiple first pads cover the connection between any two adjacent first worm joints; At least one first pad is provided on the outer side of the connection between at least two adjacent second worm joints to release stress at the connection between two adjacent second worm joints; The outer surface of the first pad strip is provided with a plurality of first protrusions, and the extending direction of the first protrusions is the same as the extending direction of the first pad strip.

2. The volute according to claim 1, characterized in that, The second cylindrical section further includes a first connecting section, a first positioning section, a second connecting section, a second positioning section, a third connecting section, and a fourth connecting section. The fourth connecting section, the first cylindrical section, the first connecting section, the first positioning section, the second connecting section, the second positioning section, and the third connecting section are connected in sequence, and the first connecting section, the first positioning section, the second connecting section, the second positioning section, the third connecting section, and the fourth connecting section all include multiple second spiral sections. In the first mating joint, the first positioning joint, and the second mating joint, each of the second worm joints has at least one of the first pads at at least one end along its own axial direction; In the second positioning section, the third mating section and the fourth mating section, each of the second worm gears has at least one of the first pads at at most one end along its own axial direction.

3. The volute according to claim 1, characterized in that, The first segment includes a plurality of first lamellae, which are connected end to end in sequence to form the first segment; The volute also includes a plurality of second pads, which extend along the extension direction of the spiral line, and at least one second pad is provided on the outer side of the connection between any two adjacent first volute plates.

4. The volute according to claim 3, characterized in that, The second cylindrical section includes multiple second worm segments, which are connected in sequence; each second worm segment includes multiple second worm plates, which are connected end to end in sequence to form the second worm segment. At least one second pad is provided on the outer side of the connection between at least two adjacent second volute plates.

5. The volute according to claim 3, characterized in that, The second cylindrical section further includes a first connecting section, a first positioning section, a second connecting section, a second positioning section, a third connecting section, and a fourth connecting section. The fourth connecting section, the first cylindrical section, the first connecting section, the first positioning section, the second connecting section, the second positioning section, and the third connecting section are connected in sequence. Each of the first connecting section, the first positioning section, the second connecting section, the second positioning section, the third connecting section, and the fourth connecting section includes multiple second worm gears. Each second worm gear includes multiple second worm plates, which are connected end to end in sequence to form the second worm gear. In the first connecting section, the first positioning section, the second connecting section, the second positioning section, the third connecting section, and the fourth connecting section, each of the second worm gears has at least one second pad at one end along its circumference.

6. The volute according to claim 3, characterized in that, The second cylindrical section includes a plurality of second worm joints connected in sequence; along the extension direction of the spiral, the minimum axial length of the first worm joint and the second worm joint is Lmin, the width of the first pad is D1, and the width of the second pad is D2, wherein 0.2Lmin≤D1≤0.4Lmin, 0.2Lmin≤D2≤0.4Lmin.

7. The volute according to claim 3, characterized in that, The outer surface of the second pad is provided with a plurality of second protrusions, and the extension direction of the second protrusions is the same as the extension direction of the second pad.

8. The volute according to claim 3, characterized in that, Both the first and second spacers are made of copper.

9. A method for installing a volute, characterized in that, For mounting the volute according to any one of claims 1 to 8, the second cylindrical section further includes a first connecting section, a first positioning section, a second connecting section, a second positioning section, a third connecting section, and a fourth connecting section, wherein the fourth connecting section, the first cylindrical section, the first connecting section, the first positioning section, the second connecting section, the second positioning section, and the third connecting section are connected in sequence, and the first connecting section, the first positioning section, the second connecting section, the second positioning section, the third connecting section, and the fourth connecting section each include a plurality of second volute sections; The method for installing the volute includes: Install and fix the first cylindrical section, the first positioning section, and the second positioning section; Install and secure the first connecting section, the second connecting section, the third connecting section, and the fourth connecting section; Welding the joints of multiple first worm joints, the joints of multiple second worm joints, and the joints of the first worm joint and the second worm joint; Install the first spacer strip.

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