High-speed heavy-load horizontal middle-open type double-suction centrifugal fan volute

Abstract

The invention particularly relates to a high-speed heavy-load horizontal middle-open type double-suction centrifugal fan volute, and belongs to the technical field of reliability improvement of high-speed heavy-load double-suction centrifugal fans. The high-speed heavy-load horizontal middle-open type double-suction centrifugal fan volute comprises a lower volute body, an upper volute body and an air inlet assembly. The lower volute is connected with the upper volute flange to form a volute; the air inlet assembly is connected to the volute through bolts. When the high-speed heavy-load horizontal middle-open type double-suction centrifugal fan volute is applied to a fan rotor component with supporting part structures at the two ends, the problem that the fan rotor component cannot be drawn out on site during equipment maintenance can be effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of reliability improvement of high-speed heavy-load double-suction centrifugal fan, and particularly relates to a high-speed heavy-load horizontal split double-suction centrifugal fan volute. BACKGROUND

[0002] In large power stations and other major projects, high-speed heavy-load double-suction centrifugal fans are widely used mechanical and electrical equipment, and the main function is to forcibly ventilate the relevant area, and the reliability is very important.

[0003] At present, the rotor part of the common high-speed heavy-load double-suction centrifugal fan is generally connected to the volute part at both ends of the support part, the fan volute is a whole structure, and the fan volute is installed between the front and rear bearing seat supports, so that the fan volute at both ends of the support part cannot be separately disassembled on site. Due to the blockage of the both-end support part, the fan rotor part cannot be pulled out along the axial direction when the equipment is overhauled, and the entire volute part can only be disassembled, hoisted out and transported to a spacious maintenance site, so that the fan rotor part can be pulled out along the axial direction. SUMMARY

[0004] The purpose of the present application is to provide a high-speed heavy-load horizontal split double-suction centrifugal fan volute, which can effectively solve the problem that the fan rotor part cannot be pulled out on site when the equipment is overhauled when applied to the fan rotor part with a two-end support part structure.

[0005] In order to solve the above problems, the present application provides the following technical scheme:

[0006] A high-speed heavy-load horizontal split double-suction centrifugal fan volute, comprising a lower volute, an upper volute and an air inlet assembly; the lower volute and the upper volute are flange-connected to form a volute; and the air inlet assembly is bolted to the volute.

[0007] In one of the specific embodiments, the lower volute is composed of a lower volute rear cover plate, a lower volute front cover plate and a lower volute flow passage shell between the lower volute rear cover plate and the lower volute front cover plate; lifting lugs are machined on the lower volute rear cover plate and the lower volute front cover plate for overall lifting of the lower volute; reinforcing rib plates are symmetrically arranged on the left and right sides of the lower volute to enhance the strength of the lower volute; support legs are symmetrically arranged on the front and rear sides of the lower volute to stably support the lower volute; a first right middle surface flange and a first left middle surface flange are arranged on the top of the lower volute for middle surface separation of the volute; a first precision machining pad and a second precision machining pad are arranged on the bottom of the lower volute; a first bolt and a first flat washer are arranged on the lower volute for overall fixation of the lower volute; and a conical pin is arranged on the lower volute for limiting the lower volute.

[0008] In one of the specific embodiments, the upper volute is composed of an upper volute back cover plate, an upper volute front cover plate, and an upper volute flow passage shell between the upper volute back cover plate and the upper volute front cover plate; the upper volute back cover plate and the upper volute front cover plate are both provided with lifting lugs for integral lifting of the upper volute; the bottom of the upper volute is provided with a second right middle surface flange and a second left middle surface flange for middle surface separation of the volute; the right side of the upper volute is provided with an outlet flange for connecting an outlet air pipe; the second right middle surface flange and the second left middle surface flange are both provided with second bolts and second flat washers for connecting the second right middle surface flange of the upper volute and the first right middle surface flange of the lower volute and the second left middle surface flange of the upper volute and the first left middle surface flange of the lower volute together, so as to connect the upper volute and the lower volute together.

[0009] In one of the specific embodiments, the air inlet assembly is provided with third bolts for connecting the air inlet assembly to the volute.

[0010] The beneficial technical effects of the present application are:

[0011] The high-speed heavy-load horizontally split double-suction centrifugal fan volute of the present application is formed by flange connection of the upper volute and the lower volute, and the air inlet assembly is bolted to the volute, which fundamentally solves the problem that the fan rotor cannot be removed on site during equipment maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 The three-dimensional assembly view of one embodiment of the high-speed heavy-load horizontally split double-suction centrifugal fan volute of the present application;

[0013] Figure 2 The three-dimensional view of the lower volute of one embodiment of the high-speed heavy-load horizontally split double-suction centrifugal fan volute of the present application;

[0014] Figure 3 The three-dimensional view of the upper volute of one embodiment of the high-speed heavy-load horizontally split double-suction centrifugal fan volute of the present application;

[0015] Figure 4 The three-dimensional view of the air inlet assembly of one embodiment of the high-speed heavy-load horizontally split double-suction centrifugal fan volute of the present application.

[0016] In the figure, 1, lower volute; 101, lower volute rear cover plate; 102, lower volute front cover plate; 103, first right side middle surface flange; 104, lower volute flow passage shell; 105, first left side middle surface flange; 106, support leg; 107, first finishing pad; 108, second finishing pad; 109, reinforcing rib plate; 110, first bolt; 111, first flat washer; 112, conical pin; 2, upper volute; 201, upper volute rear cover plate; 202, upper volute front cover plate; 203, second right side middle surface flange; 204, upper volute flow passage shell; 205, second left side middle surface flange; 206, outlet flange; 207, second bolt; 208, second flat washer; 3, air inlet assembly; 301, third bolt. DETAILED DESCRIPTION

[0017] The technical solutions of the present application will be described clearly and completely below in combination with the drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0018] In the description of the present application, it should be understood that the terms "upper", "lower", "left side", "right side", "top", "bottom", "front", "rear", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third", and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implying the number of the technical features indicated.

[0019] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0020] Reference Figures 1-4 The embodiment provides a high-speed heavy-load horizontal split double-suction centrifugal fan volute, which comprises a lower volute 1, an upper volute 2 and an air inlet assembly 3; the lower volute 1 and the upper volute 2 are flange-connected to form a volute; and the air inlet assembly 3 is bolted to the volute.

[0021] The rotor component of the common high-speed heavy-duty double-suction centrifugal fan is installed in the integral volute, and the rotor component cannot be pulled out from the front and rear positions because the bearing seat support is installed at the front and rear air inlets of the fan volute. The high-speed heavy-duty horizontal split double-suction centrifugal fan volute provided in the embodiment adopts a split structure, and when the split surface bolts of the fan volute are removed, the upper fan volute can be conveniently disassembled, and at this time, the fan rotor can be hoisted out from the upper part as a whole.

[0022] In the embodiment, the lower volute 1 is composed of the lower volute rear cover plate 101, the lower volute front cover plate 102, and the lower volute flow passage shell 104 between the lower volute rear cover plate 101 and the lower volute front cover plate 102; the lower volute rear cover plate 101 and the lower volute front cover plate 102 are both provided with lifting lugs for integral lifting of the lower volute 1; the lower volute 1 is provided with symmetrical reinforcing rib plates 109 on the left and right sides for enhancing the strength of the lower volute 1; the lower volute 1 is provided with symmetrical support legs 106 on the front and rear sides for stable support of the lower volute 1; the lower volute 1 is provided with a first right split surface flange 103 and a first left split surface flange 105 on the top for split surface separation of the volute; the lower volute 1 is provided with a first precision machining pad 107 and a second precision machining pad 108 on the bottom for ensuring that the flatness tolerance of the lower volute 1 meets the standard requirements; the lower volute 1 is provided with a first bolt 110 and a first flat washer 111 for integral fixing of the lower volute 1; and the lower volute 1 is provided with a conical pin 112 for limiting the lower volute 1.

[0023] In the embodiment, the upper volute 2 is composed of the upper volute rear cover plate 201, the upper volute front cover plate 202, and the upper volute flow passage shell 204 between the upper volute rear cover plate 201 and the upper volute front cover plate 202; the upper volute rear cover plate 201 and the upper volute front cover plate 202 are both provided with lifting lugs for integral lifting of the upper volute 2; the upper volute 2 is provided with a second right split surface flange 203 and a second left split surface flange 205 on the bottom for split surface separation of the volute; the upper volute 2 is provided with an outlet flange 206 on the right side for connecting an outlet air pipe; the second right split surface flange 203 and the second left split surface flange 205 are both provided with a second bolt 207 and a second flat washer 208 for connecting the second right split surface flange 203 of the upper volute 2 and the first right split surface flange 103 of the lower volute 1 and the second left split surface flange 205 of the upper volute 2 and the first left split surface flange 105 of the lower volute 1 together, so as to connect the upper volute 2 and the lower volute 1 together.

[0024] In the embodiment, the air inlet assembly 3 is provided with a third bolt 301 for connecting the air inlet assembly 3 to the volute.

[0025] The high-speed heavy-load horizontal double-suction centrifugal fan volute of the embodiment is assembled according to the following steps:

[0026] The lower volute 1 is connected with the working platform through the first bolt 110 and the first flat gasket 111, and is limited with the working platform through the conical pin 112;

[0027] The upper volute 2 is connected with the lower volute 1 through the second bolt 207 and the second flat gasket 208;

[0028] The air inlet assembly 3 is connected with the lower volute 1 and the upper volute 2 through the third bolt 301.

[0029] The above-mentioned embodiments only express several embodiments of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of variations and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A volute casing for a high-speed, heavy-duty, horizontally split-type double-suction centrifugal fan, characterized in that, It includes a lower volute (1), an upper volute (2) and an air inlet assembly (3); the lower volute (1) and the upper volute (2) are connected by a flange to form a volute; the air inlet assembly (3) is bolted to the volute.

2. The volute casing of the high-speed, heavy-duty horizontal split-type double-suction centrifugal fan according to claim 1, characterized in that, The lower volute (1) is composed of a lower volute rear cover plate (101), a lower volute front cover plate (102), and a lower volute flow channel shell (104) between the lower volute rear cover plate (101) and the lower volute front cover plate (102); the lower volute (1) is provided with a first right side center-parting flange (103) and a first left side center-parting flange (105) at the top for separating the center-parting surfaces of the volute.

3. The volute of the high-speed, heavy-duty horizontal split-type double-suction centrifugal fan according to claim 2, characterized in that, Lifting lugs are machined on both the rear cover plate (101) and the front cover plate (102) of the lower volute for hoisting the lower volute (1) as a whole.

4. The volute of the high-speed, heavy-duty horizontal split-type double-suction centrifugal fan according to claim 2, characterized in that, The lower volute (1) is symmetrically provided with reinforcing ribs (109) on the left and right sides to enhance the strength of the lower volute (1).

5. The volute of the high-speed, heavy-duty horizontal split-type double-suction centrifugal fan according to claim 2, characterized in that, The lower volute (1) is provided with symmetrical support legs (106) on the front and rear sides for stable support of the lower volute (1).

6. The volute of the high-speed, heavy-duty horizontal split-type double-suction centrifugal fan according to claim 2, characterized in that, The bottom of the lower volute (1) is provided with a first precision-machined pad (107) and a second precision-machined pad (108).

7. The volute casing of the high-speed, heavy-duty horizontal split-type double-suction centrifugal fan according to claim 2, characterized in that, The lower volute (1) is provided with a first bolt (110) and a first flat washer (111) for overall fixing of the lower volute (1); the lower volute (1) is provided with a conical pin (112) for limiting the lower volute (1).

8. The volute of the high-speed, heavy-duty horizontal split-type double-suction centrifugal fan according to claim 2, characterized in that, The upper volute (2) is composed of the upper volute rear cover plate (201), the upper volute front cover plate (202), and the upper volute flow channel shell (204) between the upper volute rear cover plate (201) and the upper volute front cover plate (202); the bottom of the upper volute (2) is provided with a second right side center-parting flange (203) and a second left side center-parting flange (205) for separating the center-parting surfaces of the volute; a second bolt is provided on both the second right side center-parting flange (203) and the second left side center-parting flange (205). (207) and the second flat gasket (208) are used to connect the second right-side center flange (203) of the upper volute (2) to the first right-side center flange (103) of the lower volute (1) and the second left-side center flange (205) of the upper volute (2) to the first left-side center flange (105) of the lower volute (1), thereby connecting the upper volute (2) and the lower volute (1) together; an outlet flange (206) is provided on the right side of the upper volute (2) for connecting the outlet duct.

9. The volute of a high-speed, heavy-duty, horizontally split-type double-suction centrifugal fan according to claim 8, characterized in that, Lifting lugs are machined on both the rear cover plate (201) and the front cover plate (202) of the upper volute for hoisting the upper volute (2) as a whole.

10. The volute of a high-speed, heavy-duty, horizontally split-type double-suction centrifugal fan according to claim 1, characterized in that, The air inlet assembly (3) is provided with a third bolt (301) for connecting the air inlet assembly (3) to the volute.

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